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707.073
|
Herbig-Haro Objects - Tracers of the Formation of Low-mass Stars and
Sub-stellar Objects
|
Herbig-Haro objects (HHOs) are caused by outflows from young objects. Since
the outflow relies on mass accretion from a circumstellar disk, it indicates
ongoing growth. Recent results of infrared observations yielded evidence for
disks around brown dwarfs. This suggests that at least a certain fraction of
brown dwarfs forms like stars. Thus, young sub-stellar objects might cause HHOs
as well. We present selected results of a general survey for HHOs based on
DSS-II plates and CCD images taken with the Tautenburg Schmidt telescope.
Numerous young objects could be identified due to their association with newly
detected HHOs. In some cases the luminosity is consistent with very low-mass
stars or close to sub-stellar values. This holds for L1415-IRS and a few
infrared sources embedded in other dark clouds (e.g., GF9, BHR111). The
question on the minimum mass for outflow activity is addressed.
|
astro-ph
|
herbigharo objects hhos are caused by outflows from young objects since the outflow relies on mass accretion from a circumstellar disk it indicates ongoing growth recent results of infrared observations yielded evidence for disks around brown dwarfs this suggests that at least a certain fraction of brown dwarfs forms like stars thus young substellar objects might cause hhos as well we present selected results of a general survey for hhos based on dssii plates and ccd images taken with the tautenburg schmidt telescope numerous young objects could be identified due to their association with newly detected hhos in some cases the luminosity is consistent with very lowmass stars or close to substellar values this holds for l1415irs and a few infrared sources embedded in other dark clouds eg gf9 bhr111 the question on the minimum mass for outflow activity is addressed
|
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|
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|
707.0731
|
$Z_6$ symmetry of the Standard Model and Technicolor theory
|
We consider the possibility to continue the $Z_6$ symmetry of the Standard
Model to the Technicolor theories. Among the SU(N) Weinberg - Susskind models
and the SU(N) Farhi - Susskind models for $N>2$ only the SU(4) Farhi - Susskind
model may possess the mentioned symmetry. We also show that the hypercharge
assignment of Minimal Walking SU(2) Technicolor model may be chosen in such a
way that the additional discrete symmetry is preserved.
|
hep-ph hep-lat
|
we consider the possibility to continue the z_6 symmetry of the standard model to the technicolor theories among the sun weinberg susskind models and the sun farhi susskind models for n2 only the su4 farhi susskind model may possess the mentioned symmetry we also show that the hypercharge assignment of minimal walking su2 technicolor model may be chosen in such a way that the additional discrete symmetry is preserved
|
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|
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|
707.0732
|
Parity effect in Al and Nb single electron transistors in a tunable
environment
|
Two different types of Cooper pair transistors, with Al and Nb islands, have
been investigated in a tunable electromagnetic environment. The device with an
Al island demonstrates gate charge modulation with 2e-periodicity in a wide
range of environmental impedances at bath temperatures below 340 mK. Contrary
to the results of the Al sample, we were not able to detect 2e-periodicity
under any conditions on similar samples with Nb island. We attribute this to
the material properties of Nb.
|
cond-mat.supr-con
|
two different types of cooper pair transistors with al and nb islands have been investigated in a tunable electromagnetic environment the device with an al island demonstrates gate charge modulation with 2eperiodicity in a wide range of environmental impedances at bath temperatures below 340 mk contrary to the results of the al sample we were not able to detect 2eperiodicity under any conditions on similar samples with nb island we attribute this to the material properties of nb
|
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|
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|
707.0733
|
Form factors, branching ratio and forward-backward asymmetry in B ->
K_{1}ell ^{+} ell ^{-} decays
|
We study long-distance effects in rare exclusive semileptonic decays B ->
K_{1}ell ^{+}ell ^{-}, K_{1} is the axial vector meson.The form factors,
describing the meson transition amplitudes of the effective Hamiltonian, are
calculated using Ward identites which are then used to calculate branching
ratio and forward-backward asymmetry in these decay modes. The zero of
forward-backward asymmetry is of special interest and provide us the precission
test of Standard model.
|
hep-ph
|
we study longdistance effects in rare exclusive semileptonic decays b k_1ell ell k_1 is the axial vector mesonthe form factors describing the meson transition amplitudes of the effective hamiltonian are calculated using ward identites which are then used to calculate branching ratio and forwardbackward asymmetry in these decay modes the zero of forwardbackward asymmetry is of special interest and provide us the precission test of standard model
|
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|
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|
707.0734
|
Transient NN random walk on the line
|
We prove strong theorems for the local time at infinity of a nearest neighbor
transient random walk. First, laws of the iterated logarithm are given for the
large values of the local time. Then we investigate the length of intervals
over which the walk runs through (always from left to right) without ever
returning.
|
math.PR
|
we prove strong theorems for the local time at infinity of a nearest neighbor transient random walk first laws of the iterated logarithm are given for the large values of the local time then we investigate the length of intervals over which the walk runs through always from left to right without ever returning
|
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|
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|
707.0735
|
Optical characterization of ultra-high diffraction efficiency gratings
|
We report on the optical characterization of an ultra-high diffraction
efficiency grating in 1st order Littrow configuration. The apparatus used was
an optical cavity built from the grating under investigation and an additional
high reflection mirror. Measurement of the cavity finesse provided precise
information about the grating's diffraction efficiency and its optical loss. We
measured a finesse of 1580 from which we deduced a diffraction efficiency of
(99.635$\pm$0.016)% and an overall optical loss due to scattering and
absorption of just 0.185 %.
Such high quality gratings, including the tool used for their
characterization, might apply for future gravitational wave detectors. For
example the demonstrated cavity itself presents an all-reflective, low-loss
Fabry-Perot resonator that might replace conventional arm cavities in advanced
high power Michelson interferometers.
|
physics.optics
|
we report on the optical characterization of an ultrahigh diffraction efficiency grating in 1st order littrow configuration the apparatus used was an optical cavity built from the grating under investigation and an additional high reflection mirror measurement of the cavity finesse provided precise information about the gratings diffraction efficiency and its optical loss we measured a finesse of 1580 from which we deduced a diffraction efficiency of 99635pm0016 and an overall optical loss due to scattering and absorption of just 0185 such high quality gratings including the tool used for their characterization might apply for future gravitational wave detectors for example the demonstrated cavity itself presents an allreflective lowloss fabryperot resonator that might replace conventional arm cavities in advanced high power michelson interferometers
|
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|
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|
707.0736
|
Theory of cosmological perturbations in an anisotropic universe
|
This article describes the theory of cosmological perturbations around a
homogeneous and anisotropic universe of the Bianchi I type. Starting from a
general parameterisation of the perturbed spacetime a la Bardeen, a complete
set of gauge invariant variables is constructed. Three physical degrees of
freedom are identified and it is shown that, in the case where matter is
described by a scalar field, they generalize the Mukhanov-Sasaki variables. In
order to show that they are canonical variables, the action for the
cosmological perturbations at second order is derived. Two major physical
imprints of the primordial anisotropy are identified: (1) a scalar-tensor
``see-saw'' mechanism arising from the fact that scalar, vector and tensor
modes do not decouple and (2) an explicit dependence of the statistical
properties of the density perturbations and gravity waves on the wave-vector
instead of its norm. This analysis extends, but also sheds some light on, the
quantization procedure that was developed under the assumption of a
Friedmann-Lemaitre background spacetime, and allows to investigate the
robustness of the predictions of the standard inflationary scenario with
respect to the hypothesis on the symmetries of the background spacetime. These
effects of a primordial anisotropy may be related to some anomalies of the
cosmic microwave background anisotropies on large angular scales.
|
astro-ph gr-qc hep-ph hep-th
|
this article describes the theory of cosmological perturbations around a homogeneous and anisotropic universe of the bianchi i type starting from a general parameterisation of the perturbed spacetime a la bardeen a complete set of gauge invariant variables is constructed three physical degrees of freedom are identified and it is shown that in the case where matter is described by a scalar field they generalize the mukhanovsasaki variables in order to show that they are canonical variables the action for the cosmological perturbations at second order is derived two major physical imprints of the primordial anisotropy are identified 1 a scalartensor seesaw mechanism arising from the fact that scalar vector and tensor modes do not decouple and 2 an explicit dependence of the statistical properties of the density perturbations and gravity waves on the wavevector instead of its norm this analysis extends but also sheds some light on the quantization procedure that was developed under the assumption of a friedmannlemaitre background spacetime and allows to investigate the robustness of the predictions of the standard inflationary scenario with respect to the hypothesis on the symmetries of the background spacetime these effects of a primordial anisotropy may be related to some anomalies of the cosmic microwave background anisotropies on large angular scales
|
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|
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|
707.0737
|
The Causes of Halo Shape Changes Induced by Cooling Baryons: Disks
Versus Substructures
|
Cold dark matter cosmogony predicts triaxial dark matter halos, whereas
observations find quite round halos. This is most likely due to the
condensation of baryons leading to rounder halos. We examine the halo phase
space distribution basis for such shape changes. Triaxial halos are supported
by box orbits, which pass arbitrarily close to the density center. The decrease
in triaxiality caused by baryons is thought to be due to the scattering of
these orbits. We test this hypothesis with simulations of disks grown inside
triaxial halos. After the disks are grown we check whether the phase space
structure has changed by evaporating the disks and comparing the initial and
final states. While the halos are substantially rounder when the disk is at
full mass, their final shape after the disk is evaporated is not much different
from the initial. Likewise, the halo becomes (more) radially anisotropic when
the disk is grown, but the final anisotropy is consistent with the initial.
Only if the baryons are unreasonably compact or massive does the halo change
irreversibly. We show that the character of individual orbits is not generally
changed by the growing mass. Thus the central condensation of baryons does not
destroy enough box orbits to cause the shape change. Rather, box orbits merely
become rounder along with the global potential. However, if angular momentum is
transferred to the halo, either via satellites or via bars, a large
irreversible change in the halo distribution occurs. The ability of satellites
to alter the phase space distribution of the halo is of particular concern to
galaxy formation simulations since halo triaxiality can profoundly influence
the evolution of disks.
|
astro-ph
|
cold dark matter cosmogony predicts triaxial dark matter halos whereas observations find quite round halos this is most likely due to the condensation of baryons leading to rounder halos we examine the halo phase space distribution basis for such shape changes triaxial halos are supported by box orbits which pass arbitrarily close to the density center the decrease in triaxiality caused by baryons is thought to be due to the scattering of these orbits we test this hypothesis with simulations of disks grown inside triaxial halos after the disks are grown we check whether the phase space structure has changed by evaporating the disks and comparing the initial and final states while the halos are substantially rounder when the disk is at full mass their final shape after the disk is evaporated is not much different from the initial likewise the halo becomes more radially anisotropic when the disk is grown but the final anisotropy is consistent with the initial only if the baryons are unreasonably compact or massive does the halo change irreversibly we show that the character of individual orbits is not generally changed by the growing mass thus the central condensation of baryons does not destroy enough box orbits to cause the shape change rather box orbits merely become rounder along with the global potential however if angular momentum is transferred to the halo either via satellites or via bars a large irreversible change in the halo distribution occurs the ability of satellites to alter the phase space distribution of the halo is of particular concern to galaxy formation simulations since halo triaxiality can profoundly influence the evolution of disks
|
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|
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|
707.0738
|
Completely periodic directions and orbit closures of many pseudo-Anosov
Teichmueller discs in Q(1,1,1,1)
|
In this paper, we investigate the closure of a large class of Teichm\"uller
discs in the stratum Q(1,1,1,1) or equivalently, in a GL^+_2(R)-invariant locus
L of translation surfaces of genus three. We describe a systematic way to prove
that the GL^+_2(R)-orbit closure of a translation surface in L is the whole of
L. The strategy of the proof is an analysis of completely periodic directions
on such a surface and an iterated application of Ratner's theorem to unipotent
subgroups acting on an ``adequate'' splitting. This analysis applies for
example to all Teichmueller discs stabilized obtained by Thurston's
construction with a trace field of degree three which moreover ``obviously not
Veech''. We produce an infinite series of such examples and show moreover that
the favourable splitting situation does not arise everywhere on L, contrary to
the situation in genus two. We also study completely periodic directions on
translation surfaces in L. For instance, we prove that completely periodic
directions are dense on surfaces obtained by Thurston's construction.
|
math.GT math.DS
|
in this paper we investigate the closure of a large class of teichmuller discs in the stratum q1111 or equivalently in a gl_2rinvariant locus l of translation surfaces of genus three we describe a systematic way to prove that the gl_2rorbit closure of a translation surface in l is the whole of l the strategy of the proof is an analysis of completely periodic directions on such a surface and an iterated application of ratners theorem to unipotent subgroups acting on an adequate splitting this analysis applies for example to all teichmueller discs stabilized obtained by thurstons construction with a trace field of degree three which moreover obviously not veech we produce an infinite series of such examples and show moreover that the favourable splitting situation does not arise everywhere on l contrary to the situation in genus two we also study completely periodic directions on translation surfaces in l for instance we prove that completely periodic directions are dense on surfaces obtained by thurstons construction
|
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|
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|
707.0739
|
Roche tomography of cataclysmic variables - IV. Starspots and slingshot
prominences on BV Cen
|
We present Roche tomograms of the G5-G8 IV/V secondary star in the
long-period cataclysmic variable BV Cen reconstructed from MIKE echelle data
taken on the Magellan Clay 6.5-m telescope. The tomograms show the presence of
a number of large, cool starspots on BV Cen for the first time. In particular,
we find a large high-latitude spot which is deflected from the rotational axis
in the same direction as seen on the K3-K5 IV/V secondary star in the
cataclysmic variable AE Aqr. BV Cen also shows a similar relative paucity of
spots at latitudes between 40-50 degrees when compared with AE Aqr.
Furthermore, we find evidence for an increased spot coverage around longitudes
facing the white dwarf which supports models invoking starspots at the L1 point
to explain the low-states observed in some cataclysmic variables. In total, we
estimate that some 25 per cent of the northern hemisphere of BV Cen is spotted.
We also find evidence for a faint, narrow, transient emission line with
characteristics reminiscent of the peculiar low-velocity emission features
observed in some outbursting dwarf novae. We interpret this feature as a
slingshot prominence from the secondary star and derive a maximum source size
of 75,000 km and a minimum altitude of 160,000 km above the orbital plane for
the prominence.
The entropy landscape technique was applied to determine the system
parameters of BV Cen. We find M_1 = 1.18 (+0.28 -0.16) Msolar, M_2 = 1.05
(+0.23 -0.14) Msolar and an orbital inclination of i = 53 degrees +- 4 degrees
at an optimal systemic velocity of \gamma = -22.3 km s-1. Finally, we also
report on the previously unknown binarity of the G5IV star HD 220492.
|
astro-ph
|
we present roche tomograms of the g5g8 ivv secondary star in the longperiod cataclysmic variable bv cen reconstructed from mike echelle data taken on the magellan clay 65m telescope the tomograms show the presence of a number of large cool starspots on bv cen for the first time in particular we find a large highlatitude spot which is deflected from the rotational axis in the same direction as seen on the k3k5 ivv secondary star in the cataclysmic variable ae aqr bv cen also shows a similar relative paucity of spots at latitudes between 4050 degrees when compared with ae aqr furthermore we find evidence for an increased spot coverage around longitudes facing the white dwarf which supports models invoking starspots at the l1 point to explain the lowstates observed in some cataclysmic variables in total we estimate that some 25 per cent of the northern hemisphere of bv cen is spotted we also find evidence for a faint narrow transient emission line with characteristics reminiscent of the peculiar lowvelocity emission features observed in some outbursting dwarf novae we interpret this feature as a slingshot prominence from the secondary star and derive a maximum source size of 75000 km and a minimum altitude of 160000 km above the orbital plane for the prominence the entropy landscape technique was applied to determine the system parameters of bv cen we find m_1 118 028 016 msolar m_2 105 023 014 msolar and an orbital inclination of i 53 degrees 4 degrees at an optimal systemic velocity of gamma 223 km s1 finally we also report on the previously unknown binarity of the g5iv star hd 220492
|
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|
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|
707.074
|
A Multi Interface Grid Discovery System
|
Discovery Systems (DS) can be considered as entry points for global loosely
coupled distributed systems. An efficient Discovery System in essence increases
the performance, reliability and decision making capability of distributed
systems. With the rapid increase in scale of distributed applications, existing
solutions for discovery systems are fast becoming either obsolete or incapable
of handling such complexity. They are particularly ineffective when handling
service lifetimes and providing up-to-date information, poor at enabling
dynamic service access and they can also impose unwanted restrictions on
interfaces to widely available information repositories. In this paper we
present essential the design characteristics, an implementation and a
performance analysis for a discovery system capable of overcoming these
deficiencies in large, globally distributed environments.
|
cs.DC
|
discovery systems ds can be considered as entry points for global loosely coupled distributed systems an efficient discovery system in essence increases the performance reliability and decision making capability of distributed systems with the rapid increase in scale of distributed applications existing solutions for discovery systems are fast becoming either obsolete or incapable of handling such complexity they are particularly ineffective when handling service lifetimes and providing uptodate information poor at enabling dynamic service access and they can also impose unwanted restrictions on interfaces to widely available information repositories in this paper we present essential the design characteristics an implementation and a performance analysis for a discovery system capable of overcoming these deficiencies in large globally distributed environments
|
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|
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|
707.0741
|
Realization of quantum walks with negligible decoherence in waveguide
lattices
|
Quantum random walks are the quantum counterpart of classical random walks,
and were recently studied in the context of quantum computation. A quantum
random walker is subject to self interference, leading to a remarkably
different behavior than that of classical random walks such as ballistic
propagation or localization due to disorder. Physical implementations of
quantum walks have only been made in very small scale systems severely limited
by decoherence. Here we show that the propagation of photons in waveguide
lattices, which have been studied extensively in recent years, are essentially
an implementation of quantum walks. Since waveguide lattices are easily
constructed at large scales and display negligible decoherence, they can serve
as an ideal and versatile experimental playground for the study of quantum
walks and quantum algorithms. We experimentally observe quantum walks in large
systems (~100 sites) and confirm quantum walks effects which were studied
theoretically, including ballistic propagation, disorder and boundary related
effects.
|
quant-ph cond-mat.other physics.optics
|
quantum random walks are the quantum counterpart of classical random walks and were recently studied in the context of quantum computation a quantum random walker is subject to self interference leading to a remarkably different behavior than that of classical random walks such as ballistic propagation or localization due to disorder physical implementations of quantum walks have only been made in very small scale systems severely limited by decoherence here we show that the propagation of photons in waveguide lattices which have been studied extensively in recent years are essentially an implementation of quantum walks since waveguide lattices are easily constructed at large scales and display negligible decoherence they can serve as an ideal and versatile experimental playground for the study of quantum walks and quantum algorithms we experimentally observe quantum walks in large systems 100 sites and confirm quantum walks effects which were studied theoretically including ballistic propagation disorder and boundary related effects
|
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|
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|
707.0742
|
Mobile Computing in Physics Analysis - An Indicator for eScience
|
This paper presents the design and implementation of a Grid-enabled physics
analysis environment for handheld and other resource-limited computing devices
as one example of the use of mobile devices in eScience. Handheld devices offer
great potential because they provide ubiquitous access to data and
round-the-clock connectivity over wireless links. Our solution aims to provide
users of handheld devices the capability to launch heavy computational tasks on
computational and data Grids, monitor the jobs status during execution, and
retrieve results after job completion. Users carry their jobs on their handheld
devices in the form of executables (and associated libraries). Users can
transparently view the status of their jobs and get back their outputs without
having to know where they are being executed. In this way, our system is able
to act as a high-throughput computing environment where devices ranging from
powerful desktop machines to small handhelds can employ the power of the Grid.
The results shown in this paper are readily applicable to the wider eScience
community.
|
cs.DC
|
this paper presents the design and implementation of a gridenabled physics analysis environment for handheld and other resourcelimited computing devices as one example of the use of mobile devices in escience handheld devices offer great potential because they provide ubiquitous access to data and roundtheclock connectivity over wireless links our solution aims to provide users of handheld devices the capability to launch heavy computational tasks on computational and data grids monitor the jobs status during execution and retrieve results after job completion users carry their jobs on their handheld devices in the form of executables and associated libraries users can transparently view the status of their jobs and get back their outputs without having to know where they are being executed in this way our system is able to act as a highthroughput computing environment where devices ranging from powerful desktop machines to small handhelds can employ the power of the grid the results shown in this paper are readily applicable to the wider escience community
|
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|
[-0.14713130510869402, 0.04117442059319421, -0.053997975566525414, 0.00363273659990315, -0.14364005430567875, -0.1988655104391636, 0.09211589689001845, 0.3892730171539742, -0.2678119476340397, -0.3813687999205417, 0.13255996589130914, -0.2939109545907971, -0.1116295649855207, 0.24450675992986626, -0.13046431106638656, 0.05375122673899294, 0.1037692818334831, 0.03119833489875758, 0.022053277452409, -0.2665709245806919, 0.2403234454287014, 0.08640333592712161, 0.3131345291341464, 0.060781357187149394, 0.02208257457718298, 0.0011165207209828567, -0.04922719972652765, -0.04453359181566321, -0.043554103354704624, 0.15434631180994393, 0.357732080638476, 0.21106345272000251, 0.3130075389137828, -0.5317725567147136, -0.155221020431168, 0.07344784413980522, 0.16240471942456866, 0.04517342063811529, -0.07477554844002272, -0.3014988368489297, 0.13213332623933408, -0.22398574263732657, -0.0917175112213976, -0.10690726931431298, -0.0020211893512519547, 0.06081436520599457, -0.23441214017718695, -0.07823734466794384, -0.04860142356483266, 0.05755306013610147, -0.024803230133439214, -0.05915105598067012, 0.03296186408681615, 0.24130725648523454, 0.01258583725233708, -0.013679454372410315, 0.20757055278104472, -0.15507618783614094, -0.13960915460554232, 0.4547396195289421, 0.05207420201237167, -0.14788074674945975, 0.2300980557738074, -0.05114689235665263, -0.12568271269528083, 0.07062305452677993, 0.2742349296697438, 0.08609860581738582, -0.19533674868317433, 0.0571874428280287, 0.03961614054818469, 0.1365443897610306, 0.007686489821321903, 0.0922037933515497, 0.21552207817026156, 0.21168421797387033, 0.074594516685816, 0.0923049573548817, -0.04611508314342081, -0.06897381343458027, -0.2065548558820443, -0.181175364801346, -0.21058999640300466, 0.031204841407548905, -0.04095342223392589, -0.1423410718861886, 0.36725687118757694, 0.20927050345610962, 0.12254306486055973, 0.09272998347541833, 0.3859301686892847, 0.004348068854333945, 0.15997490141518325, 0.12229115006945893, 0.11556830536013088, 0.024081161794118046, 0.256018615071802, -0.12245351490439288, 0.08544114241039896, -0.06337817805519058]
|
707.0743
|
DIANA Scheduling Hierarchies for Optimizing Bulk Job Scheduling
|
The use of meta-schedulers for resource management in large-scale distributed
systems often leads to a hierarchy of schedulers. In this paper, we discuss why
existing meta-scheduling hierarchies are sometimes not sufficient for Grid
systems due to their inability to re-organise jobs already scheduled locally.
Such a job re-organisation is required to adapt to evolving loads which are
common in heavily used Grid infrastructures. We propose a peer-to-peer
scheduling model and evaluate it using case studies and mathematical modelling.
We detail the DIANA (Data Intensive and Network Aware) scheduling algorithm and
its queue management system for coping with the load distribution and for
supporting bulk job scheduling. We demonstrate that such a system is beneficial
for dynamic, distributed and self-organizing resource management and can assist
in optimizing load or job distribution in complex Grid infrastructures.
|
cs.DC
|
the use of metaschedulers for resource management in largescale distributed systems often leads to a hierarchy of schedulers in this paper we discuss why existing metascheduling hierarchies are sometimes not sufficient for grid systems due to their inability to reorganise jobs already scheduled locally such a job reorganisation is required to adapt to evolving loads which are common in heavily used grid infrastructures we propose a peertopeer scheduling model and evaluate it using case studies and mathematical modelling we detail the diana data intensive and network aware scheduling algorithm and its queue management system for coping with the load distribution and for supporting bulk job scheduling we demonstrate that such a system is beneficial for dynamic distributed and selforganizing resource management and can assist in optimizing load or job distribution in complex grid infrastructures
|
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|
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|
707.0744
|
A process algebra based framework for promise theory
|
We present a process algebra based approach to formalize the interactions of
computing devices such as the representation of policies and the resolution of
conflicts. As an example we specify how promises may be used in coming to an
agreement regarding a simple though practical transportation problem.
|
cs.LO
|
we present a process algebra based approach to formalize the interactions of computing devices such as the representation of policies and the resolution of conflicts as an example we specify how promises may be used in coming to an agreement regarding a simple though practical transportation problem
|
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|
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|
707.0745
|
Semantic Information Retrieval from Distributed Heterogeneous Data
Sources
|
Information retrieval from distributed heterogeneous data sources remains a
challenging issue. As the number of data sources increases more intelligent
retrieval techniques, focusing on information content and semantics, are
required. Currently ontologies are being widely used for managing semantic
knowledge, especially in the field of bioinformatics. In this paper we describe
an ontology assisted system that allows users to query distributed
heterogeneous data sources by hiding details like location, information
structure, access pattern and semantic structure of the data. Our goal is to
provide an integrated view on biomedical information sources for the
Health-e-Child project with the aim to overcome the lack of sufficient
semantic-based reformulation techniques for querying distributed data sources.
In particular, this paper examines the problem of query reformulation across
biomedical data sources, based on merged ontologies and the underlying
heterogeneous descriptions of the respective data sources.
|
cs.DB
|
information retrieval from distributed heterogeneous data sources remains a challenging issue as the number of data sources increases more intelligent retrieval techniques focusing on information content and semantics are required currently ontologies are being widely used for managing semantic knowledge especially in the field of bioinformatics in this paper we describe an ontology assisted system that allows users to query distributed heterogeneous data sources by hiding details like location information structure access pattern and semantic structure of the data our goal is to provide an integrated view on biomedical information sources for the healthechild project with the aim to overcome the lack of sufficient semanticbased reformulation techniques for querying distributed data sources in particular this paper examines the problem of query reformulation across biomedical data sources based on merged ontologies and the underlying heterogeneous descriptions of the respective data sources
|
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|
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|
707.0746
|
The current spin on manganites
|
In a material, the existence and coexistence of phases with very different
magnetic and electronic properties is both unusual and surprising. Manganites
in particular capture the imagination because they demonstrate a complexity
that belies their chemically single-phase nature. This complexity arises
because the magnetic, electronic and crystal structures interact with one
another to deliver exotic magnetic and electronic phases that coexist. This
coexistence is self-organized and yet readily susceptible to external
perturbations, permitting subtle and imaginative experiments of the type that
we describe here. Moreover, these experiments reveal that each competing phase
itself remains an incompletely solved mystery.
|
cond-mat.mtrl-sci
|
in a material the existence and coexistence of phases with very different magnetic and electronic properties is both unusual and surprising manganites in particular capture the imagination because they demonstrate a complexity that belies their chemically singlephase nature this complexity arises because the magnetic electronic and crystal structures interact with one another to deliver exotic magnetic and electronic phases that coexist this coexistence is selforganized and yet readily susceptible to external perturbations permitting subtle and imaginative experiments of the type that we describe here moreover these experiments reveal that each competing phase itself remains an incompletely solved mystery
|
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|
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|
707.0747
|
Orientifold's Landscape: Non-Factorisable Six-Tori
|
We construct type IIA orientifolds on T6/(Z2 x Z2) which admit non
factorisable lattices. We describe a method to deal with this kind of
configurations and discuss how the compactification lattice affects the tadpole
cancellation conditions. Moreover, we include D6-branes which are not parallel
to O6-planes. These branes can give rise to chiral spectra in four dimensions,
thus uncovering a new corner in the landscape of intersecting D-brane model
constructions. We demonstrate the construction at an explicit example. In
general we argue that obtaining an odd number of families is problematic.
|
hep-th hep-ph
|
we construct type iia orientifolds on t6z2 x z2 which admit non factorisable lattices we describe a method to deal with this kind of configurations and discuss how the compactification lattice affects the tadpole cancellation conditions moreover we include d6branes which are not parallel to o6planes these branes can give rise to chiral spectra in four dimensions thus uncovering a new corner in the landscape of intersecting dbrane model constructions we demonstrate the construction at an explicit example in general we argue that obtaining an odd number of families is problematic
|
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|
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|
707.0748
|
Experiences of Engineering Grid-Based Medical Software
|
Objectives: Grid-based technologies are emerging as potential solutions for
managing and collaborating distributed resources in the biomedical domain. Few
examples exist, however, of successful implementations of Grid-enabled medical
systems and even fewer have been deployed for evaluation in practice. The
objective of this paper is to evaluate the use in clinical practice of a
Grid-based imaging prototype and to establish directions for engineering future
medical Grid developments and their subsequent deployment. Method: The
MammoGrid project has deployed a prototype system for clinicians using the Grid
as its information infrastructure. To assist in the specification of the system
requirements (and for the first time in healthgrid applications), use-case
modelling has been carried out in close collaboration with clinicians and
radiologists who had no prior experience of this modelling technique. A
critical qualitative and, where possible, quantitative analysis of the
MammoGrid prototype is presented leading to a set of recommendations from the
delivery of the first deployed Grid-based medical imaging application. Results:
We report critically on the application of software engineering techniques in
the specification and implementation of the MammoGrid project and show that
use-case modelling is a suitable vehicle for representing medical requirements
and for communicating effectively with the clinical community. This paper also
discusses the practical advantages and limitations of applying the Grid to
real-life clinical applications and presents the consequent lessons learned.
|
cs.DC
|
objectives gridbased technologies are emerging as potential solutions for managing and collaborating distributed resources in the biomedical domain few examples exist however of successful implementations of gridenabled medical systems and even fewer have been deployed for evaluation in practice the objective of this paper is to evaluate the use in clinical practice of a gridbased imaging prototype and to establish directions for engineering future medical grid developments and their subsequent deployment method the mammogrid project has deployed a prototype system for clinicians using the grid as its information infrastructure to assist in the specification of the system requirements and for the first time in healthgrid applications usecase modelling has been carried out in close collaboration with clinicians and radiologists who had no prior experience of this modelling technique a critical qualitative and where possible quantitative analysis of the mammogrid prototype is presented leading to a set of recommendations from the delivery of the first deployed gridbased medical imaging application results we report critically on the application of software engineering techniques in the specification and implementation of the mammogrid project and show that usecase modelling is a suitable vehicle for representing medical requirements and for communicating effectively with the clinical community this paper also discusses the practical advantages and limitations of applying the grid to reallife clinical applications and presents the consequent lessons learned
|
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|
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|
707.0749
|
Kinetics of Electrodeposition of Silver and Copper at Template Synthesis
of Nanowires
|
The results of investigation of kinetics of nanopores filling into membranes
from aluminum oxide (pore diameter - 200 nm, porosity ~ 50%) at
electrodeposition of copper and silver are described. It is shown, that at
identical quantity of electricity passed through solutions, the degree of pores
filling by metal (average thickness of a deposit) is various for copper and
silver deposition. Calculated (according Faraday Law) and experimental
dependences of deposition rates of these metals on quantity of electricity
passed at direct and pulse currents are presented. Galvanodynamic i - v
dependences have been obtained at various current scanning rates. The smaller
rate of deposition allows to decrease concentration limitations of electrode
process and to obtain higher average thickness of metal deposits and higher
filling degree. The limiting values of quantity of electricity for direct and
pulse currents were determined. The average thickness of silver and copper
deposits was obtained. A degree of pores filling, the morphology and chemical
microanalysis were studied on cross-section of the membrane, using TESCAN SEM
equipped with an Oxford Instruments INCA Enerqy EDX-system.
|
cond-mat.mes-hall cond-mat.mtrl-sci
|
the results of investigation of kinetics of nanopores filling into membranes from aluminum oxide pore diameter 200 nm porosity 50 at electrodeposition of copper and silver are described it is shown that at identical quantity of electricity passed through solutions the degree of pores filling by metal average thickness of a deposit is various for copper and silver deposition calculated according faraday law and experimental dependences of deposition rates of these metals on quantity of electricity passed at direct and pulse currents are presented galvanodynamic i v dependences have been obtained at various current scanning rates the smaller rate of deposition allows to decrease concentration limitations of electrode process and to obtain higher average thickness of metal deposits and higher filling degree the limiting values of quantity of electricity for direct and pulse currents were determined the average thickness of silver and copper deposits was obtained a degree of pores filling the morphology and chemical microanalysis were studied on crosssection of the membrane using tescan sem equipped with an oxford instruments inca enerqy edxsystem
|
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|
[-0.06563604347174987, 0.18761551317781114, -0.01626925704014652, -0.03901626771440694, 0.04376049863640219, -0.1378738159313798, 0.06867020954377949, 0.43628744811696163, -0.2091998744482065, -0.34957170951563643, 0.050866487709914934, -0.3432341405725524, -0.03248183719594689, 0.22386768906760743, -0.007705093733966351, 0.04921585057856967, -0.002617696456282454, -0.06653390529784647, -0.049085464193622634, -0.23299408614197198, 0.2221230223939261, 0.10763912719455274, 0.3424302473527325, 0.13630635100827718, 0.10755032714291969, -0.06594357697074027, 0.018017516859040104, 0.048516538409774726, -0.2129703741207777, 0.09334836626315818, 0.1969872329644311, -0.025681641710209934, 0.1813241340986946, -0.49256101167377303, -0.21177616962984971, -0.03307092402623418, 0.09803958676262375, 0.033370833186542284, -0.06486918155843502, -0.21621120730962823, 0.0734207733260358, -0.13960628855026752, -0.12965855396024006, 0.02208122099366258, 0.02644659173537922, 0.08479709832052536, -0.22845967675299, 0.09038294441724086, -0.0005075243558488128, 0.12313160790705725, -0.07838706604294095, -0.21207366154857857, -0.1166835714761606, 0.11074045143254539, 0.050582566323025865, -0.02823816588805879, 0.27539325657793706, -0.10902223728925867, -0.032837422066094246, 0.32413746472448113, -0.043161443829098166, -0.09483087147390881, 0.144325859880294, -0.20521006866029518, 0.026080401786876952, 0.22051298342412337, 0.1522053882760434, 0.10512088413837345, -0.16253585625330316, 0.001526159425959443, 0.018021750663790633, 0.21232025571277036, 0.2040217957130688, 0.006704398363089079, 0.20061217074501603, 0.23629719037836527, 0.0011339982793502072, 0.138396792759886, -0.13653859804000926, -0.025681324571590215, -0.20545782221152503, -0.20298413091941792, -0.18296241205843056, 0.09380828173392836, -0.10452785099991803, -0.15947720490803477, 0.3615332538809846, 0.053625591967583576, 0.1697116412825006, -0.017946674465201796, 0.2286298352499109, 0.06286852438934147, 0.08921293020385372, -0.02584698938059292, 0.21990536768537233, 0.18171708624234753, 0.13227776083273485, -0.2206030312090126, 0.13114066640572514, 0.031597588611218856]
|
707.075
|
Nonlinear PDEs and Scale Dependence
|
The properties of nonlinear PDEs that generate filtered solutions are
explored with particular attention given to the constraints on the residual
term. The analysis is carried out for nonlinear PDEs with an emphasis on
evolution problems recast on space-time-scale. We examine the role of
approximation that allow for the generation of solutions on isolated scale
slices.
|
math.AP math.DS
|
the properties of nonlinear pdes that generate filtered solutions are explored with particular attention given to the constraints on the residual term the analysis is carried out for nonlinear pdes with an emphasis on evolution problems recast on spacetimescale we examine the role of approximation that allow for the generation of solutions on isolated scale slices
|
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|
[-0.1173132401806387, -0.007639870087520897, -0.06601128330962225, 0.08147961395919662, -0.08776710439812054, -0.07862667739814655, -0.044080479578538376, 0.3392575753683394, -0.2681635561653159, -0.26535260044038295, 0.18578257067129017, -0.28728105056692255, -0.1477402510036799, 0.2385220313106071, 0.01065670248459686, 0.0648284946906973, 0.10503522864204239, 0.00880075006915087, -0.0966977928257124, -0.2612260202453895, 0.40018094078722327, 0.04723211824893951, 0.26617771146649666, 0.014121676083992828, 0.17773059731857344, -0.012450794282961976, -0.09722404635765336, 0.035718792693858796, -0.1596787852079036, 0.11285814556547187, 0.20664690329947255, 0.0633506232703274, 0.277559973993762, -0.4823768253014846, -0.24264430003240706, 0.06371934494765645, 0.11304057820446112, 0.07569674768231131, -0.07207163139669732, -0.26504104254259303, 0.09455566970970143, -0.08078074831176887, -0.11235209981148893, -0.10315241803499785, 8.440525694326921e-05, 0.04507441177689047, -0.2545401774008166, 0.0508968461304903, 0.053609423271634364, 0.02261178294958716, -0.08755174098875035, -0.06814618774435736, -0.015200525352900679, 0.10179679930548777, 0.05059261096652005, -0.042242394675585354, 0.06672107911647551, -0.17121974261456424, -0.08760960711674257, 0.40914684134450824, -0.06501775201494721, -0.3117333571680567, 0.17122321901419624, -0.06229576686058532, -0.17378896890546788, 0.08039527563378215, 0.2582972603426738, 0.1570175185122273, -0.10202069541608745, 0.10951262394135648, -0.020447396012869747, 0.17994316655465148, 0.03490989347919822, 0.04077292546968569, 0.19548922377553854, 0.19113171252591366, 0.0861764966340905, 0.14916717606511984, -0.0359007920646532, -0.15685274495997212, -0.32260868640785867, -0.07107582590119406, -0.11298031200739471, 0.049971977013840596, -0.04812090503559871, -0.17262222098863939, 0.42528704922984945, 0.15396858778866854, 0.18551512494344602, 0.04977767179635438, 0.20970989279448987, 0.19346313473175872, 0.06318963159891693, -0.0014556110328571364, 0.27022011114115063, 0.1327816110781648, 0.11467546156861565, -0.257486179174686, 0.03547274850478226, 0.1064466015520421]
|
707.0751
|
Fluctuation-Dissipation relations far from Equilibrium
|
In this Article we review some recent progresses in the field of
non-equilibrium linear response theory. We show how a generalization of the
fluctuation-dissipation theorem can be derived for Markov processes, and
discuss the Cugliandolo-Kurchan \cite{Cugliandolo93} fluctuation dissipation
relation for aging systems and the theorem by Franz {\it et. al.}
\cite{Franz98} relating static and dynamic properties. We than specialize the
subject to phase-ordering systems examining the scaling properties of the
linear response function and how these are determined by the behavior of
topological defects. We discuss how the connection between statics and dynamics
can be violated in these systems at the lower critical dimension or as due to
stochastic instability.
|
cond-mat.stat-mech
|
in this article we review some recent progresses in the field of nonequilibrium linear response theory we show how a generalization of the fluctuationdissipation theorem can be derived for markov processes and discuss the cugliandolokurchan citecugliandolo93 fluctuation dissipation relation for aging systems and the theorem by franz it et al citefranz98 relating static and dynamic properties we than specialize the subject to phaseordering systems examining the scaling properties of the linear response function and how these are determined by the behavior of topological defects we discuss how the connection between statics and dynamics can be violated in these systems at the lower critical dimension or as due to stochastic instability
|
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|
[-0.10906613653386447, 0.13966596311950516, -0.11167751429123786, 0.09361418821766242, -0.03216671721278646, -0.08750796378546646, 0.044836290385769945, 0.30723681079798215, -0.30660107779690876, -0.27350912956851664, 0.10565866381212825, -0.2660521198168536, -0.2512734949514792, 0.21001080254519305, -0.05661894085982414, 0.05854205944723336, -0.047621489387162236, -0.02979032091130546, -0.07781840314181243, -0.22803471727888577, 0.3327448015606083, 0.06017088055802144, 0.29502872150460974, 0.07848696302727004, 0.04318793926161723, 0.036720863586970576, -0.009117793283103226, 0.07379307535207161, -0.18806044808719483, 0.08306166501802818, 0.21839079543595663, 0.09133459450502958, 0.22957756226255654, -0.4501074851951867, -0.2246024446631564, 0.07750698421846762, 0.10374374762280826, 0.1151712359599421, -0.007039518404543121, -0.256152183866285, 0.06935665789539013, -0.15726783840316477, -0.1547269687300252, -0.11177847652791817, 0.03157087352461939, 0.07169693154631025, -0.20089064465365677, 0.12946974968746583, 0.12461625990919142, 0.07394778651087958, -0.058016784457603, -0.05707637372505024, -0.006353948643935897, 0.11334590149159918, 0.053660332503789494, -0.014453888818552004, 0.14500631996056187, -0.15030257326603005, -0.14270962896391262, 0.34481988924285656, -0.05543863883301307, -0.1980922535618345, 0.22631605320053053, -0.13606291252110048, -0.15148980749736182, 0.03180502875812491, 0.18449800104451167, 0.09907808839387008, -0.1685022974613114, 0.08535387388280392, -0.0023092256693569855, 0.11937202290179226, 0.04744395219816643, 0.059874629384237474, 0.21202106843920093, 0.15396473872710334, 0.019848812119077856, 0.18676692373380413, -0.006807402962226873, -0.13057203628133687, -0.30440284249973354, -0.13929418347358147, -0.15769248943184025, 0.08000525922697281, -0.05685866666263052, -0.09852808803998839, 0.3698643173926693, 0.193709148268137, 0.18526939374925655, 0.08131509689640289, 0.21728175321472026, 0.18774089815038492, -0.005348669634870837, 0.06453199134530307, 0.2563707405653952, 0.1926046836333541, 0.12624084963419727, -0.2584603168516394, 0.06312955039548993, 0.08060499386008933]
|
707.0752
|
Quantum dynamics in macrosystems with several coupled electronic states:
hierarchy of effective Hamiltonians
|
We address the nonadiabatic quantum dynamics of macrosystems with several
coupled electronic states, taking into account the possibility of multi-state
conical intersections. The general situation of an arbitrary number of states
and arbitrary number of nuclear degrees of freedom (modes) is considered. The
macrosystem is decomposed into a system part carrying a few, strongly coupled
modes, and an environment, comprising the vast number of remaining modes. By
successively transforming the modes of the environment, a hierarchy of
effective Hamiltonians for the environment is constructed. Each effective
Hamiltonian depends on a reduced number of effective modes, which carry
cumulative effects. By considering the system's Hamiltonian along with a few
members of the hierarchy, it is shown mathematically by a moment analysis that
the quantum dynamics of the entire macrosystem can be numerically exactly
computed on a given time-scale. The time scale wanted defines the number of
effective Hamiltonians to be included. The contribution of the environment to
the quantum dynamics of the macrosystem translates into a sequential coupling
of effective modes. The wavefunction of the macrosystem is known in the full
space of modes, allowing for the evaluation of observables such as the
time-dependent individual excitation along modes of interest, as well a spectra
and electronic-population dynamics.
|
physics.chem-ph
|
we address the nonadiabatic quantum dynamics of macrosystems with several coupled electronic states taking into account the possibility of multistate conical intersections the general situation of an arbitrary number of states and arbitrary number of nuclear degrees of freedom modes is considered the macrosystem is decomposed into a system part carrying a few strongly coupled modes and an environment comprising the vast number of remaining modes by successively transforming the modes of the environment a hierarchy of effective hamiltonians for the environment is constructed each effective hamiltonian depends on a reduced number of effective modes which carry cumulative effects by considering the systems hamiltonian along with a few members of the hierarchy it is shown mathematically by a moment analysis that the quantum dynamics of the entire macrosystem can be numerically exactly computed on a given timescale the time scale wanted defines the number of effective hamiltonians to be included the contribution of the environment to the quantum dynamics of the macrosystem translates into a sequential coupling of effective modes the wavefunction of the macrosystem is known in the full space of modes allowing for the evaluation of observables such as the timedependent individual excitation along modes of interest as well a spectra and electronicpopulation dynamics
|
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|
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|
707.0753
|
Theory of Transport Processes and the Method of the Nonequilibrium
Statistical Operator
|
The aim of this review is to provide better understanding of a few approaches
that have been proposed for treating nonequilibrium (time-dependent) processes
in statistical mechanics with the emphasis on the inter-relation between
theories. The ensemble method, as it was formulated by J. W. Gibbs, have the
great generality and the broad applicability to equilibrium statistical
mechanics. Different macroscopic environmental constraints lead to different
types of ensembles, with particular statistical characteristics. In the present
work, the statistical theory of nonequilibrium processes which is based on
nonequilibrium ensemble formalism is discussed. The kinetic approach to dynamic
many-body problems, which is important from the point of view of the
fundamental theory of irreversibility, is alluded to. The emphasis is on the
method of the nonequilibrium statistical operator (NSO) developed by D. N.
Zubarev. The NSO method permits one to generalize the Gibbs ensemble method to
the nonequilibrium case and to construct a nonequilibrium statistical operator
which enables one to obtain the transport equations and calculate the transport
coefficients in terms of correlation functions, and which, in the case of
equilibrium, goes over to the Gibbs distribution. Although some space is
devoted to the formal structure of the NSO method, the emphasis is on its
utility. Applications to specific problems such as the generalized transport
and kinetic equations, and a few examples of the relaxation and dissipative
processes, which manifest the operational ability of the method, are
considered.
|
cond-mat.stat-mech
|
the aim of this review is to provide better understanding of a few approaches that have been proposed for treating nonequilibrium timedependent processes in statistical mechanics with the emphasis on the interrelation between theories the ensemble method as it was formulated by j w gibbs have the great generality and the broad applicability to equilibrium statistical mechanics different macroscopic environmental constraints lead to different types of ensembles with particular statistical characteristics in the present work the statistical theory of nonequilibrium processes which is based on nonequilibrium ensemble formalism is discussed the kinetic approach to dynamic manybody problems which is important from the point of view of the fundamental theory of irreversibility is alluded to the emphasis is on the method of the nonequilibrium statistical operator nso developed by d n zubarev the nso method permits one to generalize the gibbs ensemble method to the nonequilibrium case and to construct a nonequilibrium statistical operator which enables one to obtain the transport equations and calculate the transport coefficients in terms of correlation functions and which in the case of equilibrium goes over to the gibbs distribution although some space is devoted to the formal structure of the nso method the emphasis is on its utility applications to specific problems such as the generalized transport and kinetic equations and a few examples of the relaxation and dissipative processes which manifest the operational ability of the method are considered
|
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|
[-0.04812170481111141, 0.0868544992128823, -0.1388811113352471, 0.08530013916885203, -0.030023506131181692, -0.10655665228420749, 0.02693935592678633, 0.31931921361370924, -0.2694790907105074, -0.29980606667380383, 0.06935800231071783, -0.2534093012240656, -0.15201406200773063, 0.19762324514858265, -0.0298579012142851, 0.11448137320632591, 0.032625832681128, 0.03592590237980055, -0.07729042897377401, -0.20432262279469757, 0.32210030754473296, 0.07163867342256089, 0.3158874707897144, 0.06734978254151312, 0.11682285931298232, 0.002440856472450368, -0.025343455877551373, 0.030307953312690865, -0.1286621039189916, 0.1435462776769666, 0.23666333095665942, 0.11643119771132603, 0.3062446525528472, -0.4085617475132359, -0.26610783805000654, 0.07021143775076626, 0.0873138807793247, 0.10734820373782372, 0.02404297120829529, -0.25301345448663576, 0.02334032985480859, -0.16325203095107002, -0.13337448157687137, -0.1162323239160345, 0.004928297153178681, 0.03967289201112741, -0.22412460387629912, 0.09026384431413038, 0.07732924107521613, 0.05474851111623835, -0.04173125766386139, -0.11932885444703255, 0.01575260257318695, 0.12198434205864497, 0.04678334284256747, -0.0010302540103092474, 0.14391146380147163, -0.1007509257515615, -0.10866526104881369, 0.40901076271733705, -0.029696900706658973, -0.22030086745805247, 0.22620440580921763, -0.12963630272511473, -0.16260620339357473, 0.10101996222709088, 0.159855976382746, 0.13292807220342628, -0.2069057165865509, 0.10512512933804673, -0.0035278766336751745, 0.08708528842680414, -0.00028416659247050894, 0.03547871845794168, 0.18017729999784857, 0.1661341942945852, 0.04506062546824204, 0.151549238738594, -0.05151114739041696, -0.2037959532039438, -0.30235878028609653, -0.14709708349064965, -0.19231400603151066, 0.07250744014423578, -0.049747470649952524, -0.174110691166146, 0.4174968907886997, 0.20386315379198888, 0.15505097725210673, 0.018991453868852176, 0.2590536462063802, 0.15965853457220217, 0.006361738098983435, 0.01629941101641731, 0.22129682600758277, 0.20307657631668954, 0.11881996392757889, -0.25424210191902485, 0.04822554027245558, 0.0930041918540968]
|
707.0754
|
The Symmetry of the Genetic Code and a Universal Trend of Amino Acid
Gain and Loss
|
Part 1 of the study intends to show that the universal trend of amino acid
gain and loss discovered by Jordan et al. (2005) can be accounted for by the
spontaneity of DNA typical damages. These damages lead to replacements of
guanine and cytosine by thymine. Part 2 proposes a hypothesis of the evolution
of the genetic code, the leading mechanism of which is the nucleotide
spontaneous damage. The hypothesis accounts for the universal trend of amino
acid gain and loss, stability of the genetic code towards point mutations, the
presence of code dialects, and the symmetry of the genetic code table.
|
q-bio.PE
|
part 1 of the study intends to show that the universal trend of amino acid gain and loss discovered by jordan et al 2005 can be accounted for by the spontaneity of dna typical damages these damages lead to replacements of guanine and cytosine by thymine part 2 proposes a hypothesis of the evolution of the genetic code the leading mechanism of which is the nucleotide spontaneous damage the hypothesis accounts for the universal trend of amino acid gain and loss stability of the genetic code towards point mutations the presence of code dialects and the symmetry of the genetic code table
|
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|
[-0.118004220994372, 0.08100635244273673, -0.02554331064297288, 0.06416360333256022, 0.0019104397654825566, -0.14598702285530082, 0.10148084484606835, 0.34950489983620014, -0.29200999047059345, -0.3062004702183984, 0.03499310327620775, -0.25498129611871406, -0.20755180886344, 0.1057598818773769, -0.0735216470903812, 0.014519849390375848, 0.074801429540065, -0.010554770747309221, 0.027772878734942746, -0.25230186996871934, 0.2840240622925408, 0.1527785875140598, 0.24058353006109304, 0.0693885747973314, 0.07546257577818252, -0.04277456040019352, -0.04658563440556035, -0.08681829600576677, -0.10641410879999931, 0.15835181382649086, 0.24389710504214698, 0.19864654739149937, 0.26918920516675593, -0.4200054145436369, -0.22457643714505157, 0.06626276040047992, 0.10884250178659226, 0.17260199787401065, -0.0748668692392005, -0.22841769710237927, 0.13125326456136854, -0.17858362445543868, -0.10011783903738593, 0.005659664542797734, 0.015118377593656382, 0.04927679685209239, -0.23602482873727293, 0.12287764537020349, 0.10461346051820061, 0.1375714007618965, -0.06406666827844638, -0.1514654372563111, -0.10126712537991504, 0.1624268882716184, 0.08450125097799316, 0.02729693004249723, 0.19089207725768326, -0.059759990517597866, -0.1405972031164257, 0.3837723645071189, -0.032359180058918746, -0.11703231660466568, 0.15103312427184873, -0.06978326572525297, -0.11338607314403407, 0.16304552584758722, 0.1348134862971218, 0.07882352736173655, -0.18483859128044808, 0.043703188729933555, 0.021251140810622304, 0.20553684590399202, 0.11928030753544733, -0.020642599305503218, 0.21419345494359732, 0.1357381940116266, -0.025786799186950222, 0.15035058378913058, -0.09349104248252058, -0.08586665796967424, -0.23954008829633833, -0.21294003926838437, -0.1058986760055596, 0.03353668389586257, -0.07580430861322812, -0.18543610541953467, 0.42444471704463166, 0.08388429537116476, 0.11889195547201763, 0.04813733046495484, 0.19365728069918559, 0.001329737003235256, 0.15102705385024642, 0.0025280382388326176, 0.14849031070137725, 0.07528264437774744, 0.03044235795352827, -0.313653963588306, 0.19674085737571267, 0.07086702417719233]
|
707.0755
|
A cellular automaton identification of the universality classes of
spatiotemporal intermittency
|
The phase diagram of the coupled sine circle map lattice shows
spatio-temporal intermittency of two distinct types: spatio-temporal
intermittency of the directed percolation (DP) class, and spatial intermittency
which does not belong to this class. These two types of behaviour are seen to
be special cases of the spreading and non-spreading regimes seen in the system.
In the spreading regime, each site can infect its neighbours permitting an
initial disturbance to spread, whereas in the non-spreading regime no infection
is possible. The two regimes are separated by a line which we call the
infection line. The coupled map lattice can be mapped on to an equivalent
cellular automaton which shows a transition from a probabilistic cellular
automaton (PCA) to a deterministic cellular automaton (DCA) at the infection
line. Thus the existence of the DP and non-DP universality classes in the same
system is signalled by the PCA to DCA transition. We also discuss the dynamic
origin of this transition.
|
nlin.CD
|
the phase diagram of the coupled sine circle map lattice shows spatiotemporal intermittency of two distinct types spatiotemporal intermittency of the directed percolation dp class and spatial intermittency which does not belong to this class these two types of behaviour are seen to be special cases of the spreading and nonspreading regimes seen in the system in the spreading regime each site can infect its neighbours permitting an initial disturbance to spread whereas in the nonspreading regime no infection is possible the two regimes are separated by a line which we call the infection line the coupled map lattice can be mapped on to an equivalent cellular automaton which shows a transition from a probabilistic cellular automaton pca to a deterministic cellular automaton dca at the infection line thus the existence of the dp and nondp universality classes in the same system is signalled by the pca to dca transition we also discuss the dynamic origin of this transition
|
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|
[-0.15804729793047234, 0.14168252941911436, -0.0527418558068468, 0.07955062787382389, -0.018494684656250215, -0.1990344533901779, 0.08597521337463795, 0.3651470609899587, -0.31894251914788624, -0.1707989935025151, 0.08195857021008741, -0.268004672363131, -0.18307756976687214, 0.129397306538556, -0.008200185010268254, 0.009638197844520024, 0.020059527961080365, 0.03521283982181043, -0.005297046137531435, -0.185937534528638, 0.3135196234439295, 0.0015845786657114073, 0.29083289316219846, 0.002924436808757062, 0.05670069455549505, -0.03881140322629113, 0.009353455981977706, 0.06824323502538311, -0.11566579645007567, 0.03696925017057256, 0.24526414404324484, 0.11961909847659112, 0.2306358496564786, -0.3761673898863717, -0.26324428581784964, 0.15928513027065722, 0.19759148704298074, 0.11629879374552003, 0.06239104658912914, -0.3041490249558346, 0.042599551057525026, -0.14332704821531222, -0.1384633411938887, 0.00885018762845382, 0.027544436121136887, 0.054918957636955215, -0.2564099534801295, 0.04874487126772526, 0.09782636663129658, 0.055310433291179954, -0.02534196763255475, -0.034375283976946516, -0.056728418529877124, 0.1649376804290234, 0.004332111925823883, 0.018956998673578102, 0.12619655552091744, -0.0967851908315184, -0.13786080792112826, 0.3709918734318805, -0.022595337759000512, -0.17057040018328237, 0.23806505286246069, -0.1607151543091889, -0.15682819871372491, 0.2166547901575518, 0.15215764757034914, 0.0387958076507228, -0.1429401618317238, 0.02159678631164895, -0.05638890368453924, 0.17415093453586358, 0.03784759944369255, -0.0014707784574045418, 0.19809812786491038, 0.17931765490123686, 0.08526080695593015, 0.1461037787236859, -0.10954397178032442, -0.16507897733925964, -0.2730614798489091, -0.11433060736389561, -0.15322412052865392, 0.05080813051901725, -0.10633128235944321, -0.1993328404390259, 0.4423400214492525, 0.14008908025896963, 0.2041962601203448, 0.06709502019652945, 0.19331337567330953, 0.14322143941590526, 0.03334270334808425, 0.05812411751516117, 0.18089132393899215, 0.10003705414117507, 0.12147898487922437, -0.24878046194050438, 0.08688210996904604, 0.12382280516384006]
|
707.0756
|
Communicability in complex networks
|
Many topological and dynamical properties of complex networks are defined by
assuming that most of the transport on the network flows along the shortest
paths. However, there are different scenarios in which non-shortest paths are
used to reach the network destination. Thus the consideration of the shortest
paths only does not account for the global communicability of a complex
network. Here we propose a new measure of the communicability of a complex
network, which is a broad generalization of the concept of the shortest path.
According to the new measure, most of real-world networks display the largest
communicability between the most connected (popular) nodes of the network
(assortative communicability). There are also several networks with the
disassortative communicability, where the most "popular" nodes communicate very
poorly to each other. Using this information we classify a diverse set of
real-world complex systems into a small number of universality classes based on
their structure-dynamic correlation. In addition, the new communicability
measure is able to distinguish finer structures of networks, such as
communities into which a network is divided. A community is unambiguously
defined here as a set of nodes displaying larger communicability among them
than to the rest of nodes in the network.
|
physics.soc-ph cond-mat.stat-mech
|
many topological and dynamical properties of complex networks are defined by assuming that most of the transport on the network flows along the shortest paths however there are different scenarios in which nonshortest paths are used to reach the network destination thus the consideration of the shortest paths only does not account for the global communicability of a complex network here we propose a new measure of the communicability of a complex network which is a broad generalization of the concept of the shortest path according to the new measure most of realworld networks display the largest communicability between the most connected popular nodes of the network assortative communicability there are also several networks with the disassortative communicability where the most popular nodes communicate very poorly to each other using this information we classify a diverse set of realworld complex systems into a small number of universality classes based on their structuredynamic correlation in addition the new communicability measure is able to distinguish finer structures of networks such as communities into which a network is divided a community is unambiguously defined here as a set of nodes displaying larger communicability among them than to the rest of nodes in the network
|
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|
[-0.17432242186638106, 0.08863430967860257, -0.044340905127004344, 0.08659508685518835, -0.08564586316545804, -0.1518514756154847, 0.061022196002119215, 0.39485907082478355, -0.30657604231356655, -0.30007709855612236, 0.04699550341613201, -0.28793682305669915, -0.21557082294194557, 0.167410503442756, -0.02723106377318198, 0.03213341954832871, 0.05899178660393632, 0.08442965585423347, -0.01831196762727972, -0.21664557017997574, 0.35684277778513823, 0.01221114547172589, 0.27374289777194755, 0.059788045378700735, 0.07812820918932187, -0.03305327202151738, -0.039326003666930086, 0.09857147358341545, -0.07951268164542491, 0.1643409705118494, 0.26376890612821746, 0.17787078699439912, 0.28370303534138114, -0.4012102304740035, -0.24864176161754042, 0.17927321443561262, 0.12474326821929076, 0.05959742070136323, 0.041593669917184245, -0.2856740273942995, 0.12393414333928376, -0.14549443496747952, -0.041168320801257346, -0.05009566766930401, 0.046179846061199015, 0.05321639414216578, -0.20095813654673597, 0.000599068511174343, -0.010644818592002264, 0.017766827604266008, 0.021772778567519798, -0.09731309919905344, -0.0571567404306313, 0.20442357508984593, 0.016914152563433742, 0.00639183511575267, 0.10127363478954862, -0.12661741952300629, -0.14510342298018797, 0.41672943535015283, 0.005593142043831017, -0.18636995346008264, 0.2298045941056285, -0.08524708227435154, -0.1662850833627678, 0.10662164131123851, 0.22321181946586985, 0.11946464393899511, -0.20183592964547561, -0.03971989579592595, -0.08795350342432955, 0.1266815553961405, 0.03328123286514733, 0.07335596403283118, 0.17768997101181108, 0.22365975209433048, 0.12943191477416122, 0.11921950249697559, -0.07919519229728927, -0.11586618693244287, -0.2347120895601846, -0.1544557349079877, -0.23369979725418547, 0.014132318424077738, -0.15325614376755523, -0.19155921162898415, 0.46700891292658614, 0.14981571191097076, 0.26052250281967854, 0.08610180804137585, 0.2595218835318628, 0.04554734203691678, 0.1299481455494988, 0.12383203944469344, 0.1919333241504631, 0.11973507937324229, 0.09224068412847704, -0.13566737398372, 0.12050006739083974, 0.014541175494443125]
|
707.0757
|
Quasi-quantum groups from strings
|
Motivated by string theory on the orbifold ${\cal M}/G$ in presence of a
Kalb-Ramond field strength $H$, we define the operators that lift the group
action to the twisted sectors. These operators turn out to generate the
quasi-quantum group $D_{\omega}[G]$, introduced in the context of conformal
field theory by R. Dijkgraaf, V. Pasquier and P. Roche, with $\omega$ a
3-cocycle determined by a series of cohomological equations in a tricomplex
combining de Rham, \u{C}ech and group cohomologies. We further illustrate some
properties of the quasi-quantum group from a string theoretical point of view.
|
hep-th
|
motivated by string theory on the orbifold cal mg in presence of a kalbramond field strength h we define the operators that lift the group action to the twisted sectors these operators turn out to generate the quasiquantum group d_omegag introduced in the context of conformal field theory by r dijkgraaf v pasquier and p roche with omega a 3cocycle determined by a series of cohomological equations in a tricomplex combining de rham ucech and group cohomologies we further illustrate some properties of the quasiquantum group from a string theoretical point of view
|
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|
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|
707.0758
|
Transverse oscillations of two coronal loops
|
We study transverse fast magnetohydrodynamic waves in a system of two coronal
loops modeled as smoothed, dense plasma cylinders in a uniform magnetic field.
The collective oscillatory properties of the system due to the interaction
between the individual loops are investigated from two points of view. Firstly,
the frequency and spatial structure of the normal modes are studied. The system
supports four trapped normal modes in which the loops move rigidly in the
transverse direction. The direction of the motions is either parallel or
perpendicular to the plane containing the axes of the loops. Two of these modes
correspond to oscillations of the loops in phase, while in the other two they
move in antiphase. Thus, these solutions are the generalization of the kink
mode of a single cylinder to the double cylinder case. Secondly, we analyze the
time-dependent problem of the excitation of the pair of tubes. We find that
depending on the shape and location of the initial disturbance, different
normal modes can be excited. The frequencies of normal modes are accurately
recovered from the numerical simulations. In some cases, because of the
simultaneous excitation of several eigenmodes, the system shows beating and the
phase lag between the loops is $\pi/2$.
|
astro-ph
|
we study transverse fast magnetohydrodynamic waves in a system of two coronal loops modeled as smoothed dense plasma cylinders in a uniform magnetic field the collective oscillatory properties of the system due to the interaction between the individual loops are investigated from two points of view firstly the frequency and spatial structure of the normal modes are studied the system supports four trapped normal modes in which the loops move rigidly in the transverse direction the direction of the motions is either parallel or perpendicular to the plane containing the axes of the loops two of these modes correspond to oscillations of the loops in phase while in the other two they move in antiphase thus these solutions are the generalization of the kink mode of a single cylinder to the double cylinder case secondly we analyze the timedependent problem of the excitation of the pair of tubes we find that depending on the shape and location of the initial disturbance different normal modes can be excited the frequencies of normal modes are accurately recovered from the numerical simulations in some cases because of the simultaneous excitation of several eigenmodes the system shows beating and the phase lag between the loops is pi2
|
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|
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|
707.0759
|
Optimal state in the Knill-Laflamme-Milburn scheme of linear optical
teleportation
|
We discuss some properties of the Knill-Laflamme-Milburn scheme for quantum
teleportation with both maximally and nonmaximally entangled states. We derive
the error correction scheme when one performs teleportation with nonmaximally
entangled states and we find the probability for perfect teleportation. We show
that the maximally entangled state is optimal in such a case. We also show how
the error correction scheme can be implemented experimentally when one uses
polarization encoding.
|
quant-ph
|
we discuss some properties of the knilllaflammemilburn scheme for quantum teleportation with both maximally and nonmaximally entangled states we derive the error correction scheme when one performs teleportation with nonmaximally entangled states and we find the probability for perfect teleportation we show that the maximally entangled state is optimal in such a case we also show how the error correction scheme can be implemented experimentally when one uses polarization encoding
|
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|
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|
707.076
|
Travelling wave solutions of the generalized Benjamin-Bona-Mahony
equation
|
A class of particular travelling wave solutions of the generalized
Benjamin-Bona-Mahony equation is studied systematically using the factorization
technique. Then, the general travelling wave solutions of Benjamin-Bona-Mahony
equation, and of its modified version, are also recovered.
|
nlin.SI
|
a class of particular travelling wave solutions of the generalized benjaminbonamahony equation is studied systematically using the factorization technique then the general travelling wave solutions of benjaminbonamahony equation and of its modified version are also recovered
|
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|
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|
707.0761
|
Managing Separation of Concerns in Grid Applications Through
Architectural Model Transformations
|
Grids enable the aggregation, virtualization and sharing of massive
heterogeneous and geographically dispersed resources, using files, applications
and storage devices, to solve computation and data intensive problems, across
institutions and countries via temporary collaborations called virtual
organizations (VO). Most implementations result in complex superposition of
software layers, often delivering low quality of service and quality of
applications. As a consequence, Grid-based applications design and development
is increasingly complex, and the use of most classical engineering practices is
unsuccessful. Not only is the development of such applications a
time-consuming, error prone and expensive task, but also the resulting
applications are often hard-coded for specific Grid configurations, platforms
and infra-structures. Having neither guidelines nor rules in the design of a
Grid-based application is a paradox since there are many existing architectural
approaches for distributed computing, which could ease and promote rigorous
engineering methods based on the re-use of software components. It is our
belief that ad-hoc and semi-formal engineer-ing approaches, in current use, are
insufficient to tackle tomorrows Grid develop-ments requirements. Because
Grid-based applications address multi-disciplinary and complex domains (health,
military, scientific computation), their engineering requires rigor and
control. This paper therefore advocates a formal model-driven engineering
process and corresponding design framework and tools for building the next
generation of Grids.
|
cs.SE cs.DC
|
grids enable the aggregation virtualization and sharing of massive heterogeneous and geographically dispersed resources using files applications and storage devices to solve computation and data intensive problems across institutions and countries via temporary collaborations called virtual organizations vo most implementations result in complex superposition of software layers often delivering low quality of service and quality of applications as a consequence gridbased applications design and development is increasingly complex and the use of most classical engineering practices is unsuccessful not only is the development of such applications a timeconsuming error prone and expensive task but also the resulting applications are often hardcoded for specific grid configurations platforms and infrastructures having neither guidelines nor rules in the design of a gridbased application is a paradox since there are many existing architectural approaches for distributed computing which could ease and promote rigorous engineering methods based on the reuse of software components it is our belief that adhoc and semiformal engineering approaches in current use are insufficient to tackle tomorrows grid developments requirements because gridbased applications address multidisciplinary and complex domains health military scientific computation their engineering requires rigor and control this paper therefore advocates a formal modeldriven engineering process and corresponding design framework and tools for building the next generation of grids
|
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|
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|
707.0762
|
PhantomOS: A Next Generation Grid Operating System
|
Grid Computing has made substantial advances in the past decade; these are
primarily due to the adoption of standardized Grid middleware. However Grid
computing has not yet become pervasive because of some barriers that we believe
have been caused by the adoption of middleware centric approaches. These
barriers include: scant support for major types of applications such as
interactive applications; lack of flexible, autonomic and scalable Grid
architectures; lack of plug-and-play Grid computing and, most importantly, no
straightforward way to setup and administer Grids. PhantomOS is a project which
aims to address many of these barriers. Its goal is the creation of a user
friendly pervasive Grid computing platform that facilitates the rapid
deployment and easy maintenance of Grids whilst providing support for major
types of applications on Grids of almost any topology. In this paper we present
the detailed system architecture and an overview of its implementation.
|
cs.DC
|
grid computing has made substantial advances in the past decade these are primarily due to the adoption of standardized grid middleware however grid computing has not yet become pervasive because of some barriers that we believe have been caused by the adoption of middleware centric approaches these barriers include scant support for major types of applications such as interactive applications lack of flexible autonomic and scalable grid architectures lack of plugandplay grid computing and most importantly no straightforward way to setup and administer grids phantomos is a project which aims to address many of these barriers its goal is the creation of a user friendly pervasive grid computing platform that facilitates the rapid deployment and easy maintenance of grids whilst providing support for major types of applications on grids of almost any topology in this paper we present the detailed system architecture and an overview of its implementation
|
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|
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|
707.0763
|
The Requirements for Ontologies in Medical Data Integration: A Case
Study
|
Evidence-based medicine is critically dependent on three sources of
information: a medical knowledge base, the patients medical record and
knowledge of available resources, including where appropriate, clinical
protocols. Patient data is often scattered in a variety of databases and may,
in a distributed model, be held across several disparate repositories.
Consequently addressing the needs of an evidence-based medicine community
presents issues of biomedical data integration, clinical interpretation and
knowledge management. This paper outlines how the Health-e-Child project has
approached the challenge of requirements specification for (bio-) medical data
integration, from the level of cellular data, through disease to that of
patient and population. The approach is illuminated through the requirements
elicitation and analysis of Juvenile Idiopathic Arthritis (JIA), one of three
diseases being studied in the EC-funded Health-e-Child project.
|
cs.DB
|
evidencebased medicine is critically dependent on three sources of information a medical knowledge base the patients medical record and knowledge of available resources including where appropriate clinical protocols patient data is often scattered in a variety of databases and may in a distributed model be held across several disparate repositories consequently addressing the needs of an evidencebased medicine community presents issues of biomedical data integration clinical interpretation and knowledge management this paper outlines how the healthechild project has approached the challenge of requirements specification for bio medical data integration from the level of cellular data through disease to that of patient and population the approach is illuminated through the requirements elicitation and analysis of juvenile idiopathic arthritis jia one of three diseases being studied in the ecfunded healthechild project
|
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|
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|
707.0764
|
p-Adic Degeneracy of the Genetic Code
|
Degeneracy of the genetic code is a biological way to minimize effects of the
undesirable mutation changes. Degeneration has a natural description on the
5-adic space of 64 codons $\mathcal{C}_5 (64) = \{n_0 + n_1 5 + n_2 5^2
: n_i = 1, 2, 3, 4 \} ,$ where $n_i$ are digits related to nucleotides as
follows: C = 1, A = 2, T = U = 3, G = 4. The smallest 5-adic distance between
codons joins them into 16 quadruplets, which under 2-adic distance decay into
32 doublets. p-Adically close codons are assigned to one of 20 amino acids,
which are building blocks of proteins, or code termination of protein
synthesis. We shown that genetic code multiplets are made of the p-adic nearest
codons.
|
q-bio.GN cs.IT math.IT physics.bio-ph
|
degeneracy of the genetic code is a biological way to minimize effects of the undesirable mutation changes degeneration has a natural description on the 5adic space of 64 codons mathcalc_5 64 n_0 n_1 5 n_2 52 n_i 1 2 3 4 where n_i are digits related to nucleotides as follows c 1 a 2 t u 3 g 4 the smallest 5adic distance between codons joins them into 16 quadruplets which under 2adic distance decay into 32 doublets padically close codons are assigned to one of 20 amino acids which are building blocks of proteins or code termination of protein synthesis we shown that genetic code multiplets are made of the padic nearest codons
|
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|
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|
707.0765
|
Velocity plateaus and jumps in carbon nanotube sliding
|
The friction between concentric carbon nanotubes sliding one inside the other
has been widely studied and simulated, but not so far using external force as
the driving variable. Our molecular dynamics (MD) simulations show that as the
pulling force grows, the sliding velocity increases by jumps and plateaus
rather than continuously as expected. Dramatic friction peaks (similar to that
recently noted by Tangney {\it et al.} in Phys. Rev. Lett. 97 (2006) 195901)
which develop around some preferential sliding velocities, are at the origin of
this phenomenon. The (stable) rising edge of the peak produces a velocity
plateau; the (unstable) dropping edge produces a jump to the nearest stable
branch. The outcome is reminiscent of conduction in ionized gases, the plateau
correspon ding to a current stabilization against voltage variations, the jump
corresponding to a discharge or breakdown.
|
cond-mat.mtrl-sci
|
the friction between concentric carbon nanotubes sliding one inside the other has been widely studied and simulated but not so far using external force as the driving variable our molecular dynamics md simulations show that as the pulling force grows the sliding velocity increases by jumps and plateaus rather than continuously as expected dramatic friction peaks similar to that recently noted by tangney it et al in phys rev lett 97 2006 195901 which develop around some preferential sliding velocities are at the origin of this phenomenon the stable rising edge of the peak produces a velocity plateau the unstable dropping edge produces a jump to the nearest stable branch the outcome is reminiscent of conduction in ionized gases the plateau correspon ding to a current stabilization against voltage variations the jump corresponding to a discharge or breakdown
|
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|
[-0.12742158786366511, 0.17663253823602845, -0.09136359422827942, -0.008558199999269343, -0.05475322775420372, -0.15946953903448624, 0.08130036594930791, 0.3731295172274657, -0.2549467493298151, -0.3001974629251844, 0.04026481067340305, -0.2635548236902232, -0.1370923191081243, 0.1754259730835384, -0.06819017721258484, 0.011476026404390697, 0.010197173127646212, -0.017510969994800424, -0.010548328171844465, -0.2220182129569406, 0.18818133382507377, 0.10400854919193292, 0.2998955529523048, 0.019941431069134794, 0.07229080030279927, -0.030434449867814455, 0.025387743108967034, 0.07248878845754657, -0.15738400044986114, -0.0010835536573775603, 0.1696781549572156, -0.05696384649363476, 0.2919275020283178, -0.41537284340716246, -0.2556217277131934, 0.06573859263503802, 0.12425209647452418, 0.12409840077654642, -0.027178955612148423, -0.2782692706253189, 0.04147262783741483, -0.1493695906234266, -0.1705121063307798, -0.024360231619267078, 0.1458491295453732, 0.049976919397004764, -0.21617333063801383, 0.155737833072343, 0.055677291073829585, 0.05237945873990492, -0.03330212194017087, -0.08220380056227972, -0.10051338930179222, 0.028512676113266428, 0.048090478067157154, 0.0839330122889407, 0.23580635093784735, -0.0850749202157595, -0.09456560965355514, 0.3496441213400477, -0.08486705052168839, -0.0717984254264407, 0.2644576487712644, -0.14799260199205935, -0.0702791445300979, 0.1931374987492161, 0.08459891914220079, 0.08666437421840391, -0.1068164740118069, -0.0023647574444444182, -0.03423011869389265, 0.11401163561636732, 0.1669910801489613, -0.031031329099795897, 0.23543656730929213, 0.13702008139382857, 0.04252776066113236, 0.12769936684928632, -0.15431475600084957, -0.14243851340397934, -0.2525108198333195, -0.12623299379241618, -0.17617443161778643, 0.042212492808547504, -0.008630941873271847, -0.19633891924801045, 0.3531635965587721, 0.12396293497868698, 0.2603374758436188, 0.008212020264659756, 0.287683481649652, 0.12275539826173472, 0.06414780900031872, 0.1307677560329546, 0.2855654429199504, 0.14131480391497594, 0.12105775844428117, -0.26572602199064227, 0.10787358976234376, 0.027287632818367793]
|
707.0766
|
Interpretation of Light-Quenching Factor Measurements
|
We observe that the pattern of the quenching factors for scintillation light
from various ions, recently studied in $CaWO_4$ in connection with dark matter
detectors, can be understood as a saturation phenomenon in which the light
output is simply proportional to track length, independent of the ion and its
energy. This observation is in accord with the high dE/dx limit of Birks' law.
It suggests a simple model for the intrinsic resolution of light detectors for
low energy ions, which we briefly discuss.
|
physics.ins-det
|
we observe that the pattern of the quenching factors for scintillation light from various ions recently studied in cawo_4 in connection with dark matter detectors can be understood as a saturation phenomenon in which the light output is simply proportional to track length independent of the ion and its energy this observation is in accord with the high dedx limit of birks law it suggests a simple model for the intrinsic resolution of light detectors for low energy ions which we briefly discuss
|
[['we', 'observe', 'that', 'the', 'pattern', 'of', 'the', 'quenching', 'factors', 'for', 'scintillation', 'light', 'from', 'various', 'ions', 'recently', 'studied', 'in', 'cawo_4', 'in', 'connection', 'with', 'dark', 'matter', 'detectors', 'can', 'be', 'understood', 'as', 'a', 'saturation', 'phenomenon', 'in', 'which', 'the', 'light', 'output', 'is', 'simply', 'proportional', 'to', 'track', 'length', 'independent', 'of', 'the', 'ion', 'and', 'its', 'energy', 'this', 'observation', 'is', 'in', 'accord', 'with', 'the', 'high', 'dedx', 'limit', 'of', 'birks', 'law', 'it', 'suggests', 'a', 'simple', 'model', 'for', 'the', 'intrinsic', 'resolution', 'of', 'light', 'detectors', 'for', 'low', 'energy', 'ions', 'which', 'we', 'briefly', 'discuss']]
|
[-0.06546847107651901, 0.2279985493234168, -0.09843845898846545, 0.09338128620180784, -0.014756810511967325, -0.1391212277350027, 0.019366392610504865, 0.37966605572097273, -0.24772517506526895, -0.35904015290988495, 0.054908833236444785, -0.30136349486433955, -0.0713410581860422, 0.17869020540881567, -0.05138082347855152, 0.024481114807275002, 0.011264002113322536, 0.02905739888728383, -0.03335475271107651, -0.16584629734910755, 0.244500879387663, 0.13323090087898715, 0.28516417604040756, 0.10789388324504337, 0.15935486584834485, 0.005401054745068751, -0.02409280765891434, 0.013056026233068431, -0.10269670836188823, 0.053321741364267934, 0.24022017645997457, 0.06500150414430242, 0.15423765388339847, -0.4165558916438057, -0.24004834379821297, 0.07725461347853338, 0.13075429122019783, 0.09455602293755545, -0.10472937264894865, -0.2022191001079887, 0.05328123626041125, -0.1803975701107677, -0.16893359312944742, 0.0011804508752223239, 0.007304798573233098, 0.07275278193045812, -0.2251975089536015, 0.08727543699521437, 0.020783365412379604, -0.008968332154025515, -0.039513909611402144, -0.09741666578654065, 0.031557154537358106, 0.025492911779669572, 0.08402658089383853, 0.02698331915335842, 0.1594836442809866, -0.15519965627281196, -0.0728705324378448, 0.37582428305667925, -0.09777652720236275, -0.1402150606854008, 0.14949050288737178, -0.1845239464036492, -0.11580568316942418, 0.1596305842556239, 0.14411214785650373, 0.07928897113532617, -0.13505207505974784, 0.036061985914368204, -0.013132248298231378, 0.1978986646459071, 0.06327791470495692, 0.09891297329912882, 0.23757105850311647, 0.22794086366039085, 0.006901124800858368, 0.10853937477401475, -0.11740765710752625, -0.03189001884171178, -0.3069807155035346, -0.1752926476491918, -0.17873528345589, 0.033448694352374735, -0.06911718387543139, -0.09158494840768805, 0.3867057447759322, 0.10569777220195856, 0.22472286236708064, -0.025646660889285695, 0.30641876118459616, 0.12579812219293496, 0.06664537462259991, 0.02031795359609357, 0.3033558968342392, 0.13416223210725844, 0.12715456948941012, -0.25956783071440837, 0.056021542016259696, -0.002402523106121155]
|
707.0767
|
Continuum Coupling and Single-Nucleon Overlap Integrals
|
The presence of a particle continuum, both of a resonant and non-resonant
character, can significantly impact spectroscopic properties of weakly bound
nuclei and excited nuclear states close to, and above, the particle emission
threshold. In the framework of the continuum shell model in the complex
momentum-plane, the so-called Gamow Shell Model, we discuss salient effects of
the continuum coupling on the one-neutron overlap integrals and the associated
spectroscopic factors in neutron-rich helium and oxygen nuclei. In particular,
we demonstrate a characteristic near-threshold energy dependence of the
spectroscopic factors for different l-waves. We show also that the realistic
radial overlap functions, which are needed for the description of transfer
reactions, can be generated by single-particle wave functions of the
appropriately chosen complex potential.
|
nucl-th
|
the presence of a particle continuum both of a resonant and nonresonant character can significantly impact spectroscopic properties of weakly bound nuclei and excited nuclear states close to and above the particle emission threshold in the framework of the continuum shell model in the complex momentumplane the socalled gamow shell model we discuss salient effects of the continuum coupling on the oneneutron overlap integrals and the associated spectroscopic factors in neutronrich helium and oxygen nuclei in particular we demonstrate a characteristic nearthreshold energy dependence of the spectroscopic factors for different lwaves we show also that the realistic radial overlap functions which are needed for the description of transfer reactions can be generated by singleparticle wave functions of the appropriately chosen complex potential
|
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|
[-0.06703162021973791, 0.17129555251449347, -0.061198284364460655, 0.13925653369515203, 0.005609972619762023, -0.05494915396363164, 0.059666043519973753, 0.3740895379024247, -0.22914638744744784, -0.2819385150913149, -0.021101883011093985, -0.28486967509767663, -0.10166717139460767, 0.14452249079283017, 0.07134904249881704, 0.04134227722339953, 0.06958022885567819, 0.013245699577964842, -0.04914850739490551, -0.13630856749756884, 0.38820570237003266, 0.07688796274208774, 0.22974252078371743, 0.12917598529408375, 0.03418999077208961, 0.002613062207819894, 0.0022993264525818327, -0.02291604915323357, -0.11817832349558254, 0.11023792827957853, 0.21512862972449512, 0.0739349197402286, 0.21063312666956335, -0.416393058327958, -0.2135565485805273, 0.0765274678002849, 0.1771224302511352, 0.13618890846749612, -0.03554346396704204, -0.2909500819010039, 0.015744724151833603, -0.18338292154173055, -0.18429443566031598, -0.08520303532325973, 0.019580850882145267, 0.08797795080269376, -0.2678946360751676, 0.07230937061225025, 0.02598530904991397, 0.02624899922714879, -0.13099870492781823, -0.15359525366220622, -0.051575944960738224, 0.10021691804674143, 0.014506702097908905, -0.020517215660462777, 0.1923368653592964, -0.1638912219321355, -0.03726677891487876, 0.3764986078303385, -0.06310515639585598, -0.1535987086361274, 0.18220419819311548, -0.1886179180117324, -0.12082710839264715, 0.1919066254515201, 0.17704073538770898, 0.12817027763618777, -0.1173833365328998, 0.07151859113704025, -0.02535517800121549, 0.18308463357388974, 0.05036334096997355, 0.0823408643482253, 0.18361209275317378, 0.13404281109493846, -0.03223364615890508, 0.10747474746215933, -0.1612962449808644, -0.08925032183372726, -0.31893221503899744, -0.10349616024420054, -0.14110672590322793, 0.02528472301916433, -0.05815137480130943, -0.15546815753914417, 0.423502665416648, 0.0637128941093882, 0.2038181305998781, -0.028996249136010496, 0.26432924745604397, 0.13007419401934991, 0.05293168181475873, 0.03840065145632252, 0.30767686329782007, 0.15845937818521633, 0.008749927995571246, -0.3054438085760921, 0.022959939060577503, 0.019994825047130387]
|
707.0768
|
Anomalous exchange coupling in transition-metal-oxide based
superlattices with antiferromagnetic spacer layers
|
A direct correlation is seen between the coercive field (HC) and the
magnetic-field-dependent resistivity (MR) in SrMnO3/SrRuO3 superlattices of
perpendicular magnetic anisotropy. The magnetoresistance shows a sharp jump at
Hc for in-plane current and the out-of-plane magnetic field. Both HC and
high-field MR also oscillate with the thickness of the SrMnO3 spacer layers
separating the metallic ruthenate. Since the spacer in these superlattices has
no mobile carriers to facilitate an oscillatory coupling, we attribute the
observed behavior to the spin-polarized quantum tunneling of electrons between
the ferromagnetic layers and antiferromagnetically ordered t2g spins of SrMnO3.
|
cond-mat.str-el cond-mat.mtrl-sci
|
a direct correlation is seen between the coercive field hc and the magneticfielddependent resistivity mr in srmno3srruo3 superlattices of perpendicular magnetic anisotropy the magnetoresistance shows a sharp jump at hc for inplane current and the outofplane magnetic field both hc and highfield mr also oscillate with the thickness of the srmno3 spacer layers separating the metallic ruthenate since the spacer in these superlattices has no mobile carriers to facilitate an oscillatory coupling we attribute the observed behavior to the spinpolarized quantum tunneling of electrons between the ferromagnetic layers and antiferromagnetically ordered t2g spins of srmno3
|
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|
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|
707.0769
|
Double Periodicity and Frequency-Locking in the Langford Equation
|
The bifurcation structure of the Langford equation is studied numerically in
detail. Periodic, doubly-periodic, and chaotic solutions and the routes to
chaos via coexistence of double periodicity and period-doubling bifurcations
are found by the Poincar\'e plot of successive maxima of the first mode $x_1$.
Frequency-locked periodic solutions corresponding to the Farey sequence $F_n$
are examined up to $n=14$. Period-doubling bifurcations appears on some of the
periodic solutions and the similarity of bifurcation structures between the
sine-circle map and the Langford equation is shown. A method to construct the
Poincar\'e section for triple periodicity is proposed.
|
physics.flu-dyn physics.gen-ph
|
the bifurcation structure of the langford equation is studied numerically in detail periodic doublyperiodic and chaotic solutions and the routes to chaos via coexistence of double periodicity and perioddoubling bifurcations are found by the poincare plot of successive maxima of the first mode x_1 frequencylocked periodic solutions corresponding to the farey sequence f_n are examined up to n14 perioddoubling bifurcations appears on some of the periodic solutions and the similarity of bifurcation structures between the sinecircle map and the langford equation is shown a method to construct the poincare section for triple periodicity is proposed
|
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|
[-0.2378353344460361, 0.09372495352413113, -0.10619042131461595, 0.10934498633478622, -0.0262465131273003, -0.1191736071615627, 0.05077462340337469, 0.3005229603695242, -0.33196150542874087, -0.18364939917075007, 0.12050159550394471, -0.29692977686461647, -0.24815149381756782, 0.2004198444567584, -0.01112095333733841, 0.12445006446643292, 0.04056923882790694, 0.05521008229177249, -0.049400019900579205, -0.2085378693784342, 0.31220956900108016, -0.028495085141376445, 0.2351203709963317, -0.05512269587366302, 0.07229187974804326, -0.07181215897006424, 0.006729101154365038, -0.09116131757925215, -0.219864531116266, 0.0395252994310699, 0.1936851633197971, 0.037561139702110696, 0.20759140171943918, -0.35037943109085684, -0.14503330597163816, 0.1097047419875468, 0.21342517725731197, 0.06201140145330052, -0.01183022071705445, -0.32245160776656123, 0.12104429025448074, -0.07187065504074684, -0.19744896857852215, -0.08653044915761136, 0.08263382847960057, 0.10938136151158497, -0.2474540089581799, 0.0933593464451597, 0.06508468548326116, 0.07491266634070168, -0.059807844234532434, -0.006306154425501039, -0.13099022259641635, 0.08836505669904382, 0.07195406572059973, -0.007241552220167298, 0.05361374141893497, -0.02067661974088926, -0.15368806721740647, 0.3456536560760517, -0.03969544245934996, -0.19571137580726491, 0.1632901997967182, -0.16346778850512286, -0.10678581477780091, 0.22113958209949106, 0.09345711695618536, 0.09766518812822668, -0.11584389409797854, 0.07226612660237343, -0.002024350374152786, 0.12840689766759936, 0.20929351984278152, -0.05356475191288873, 0.1524662780624471, 0.13240267759875246, 0.07120085526257754, 0.17450934487738107, -0.06977527375627113, -0.18288054403015658, -0.261915284669713, -0.09533460831367656, -0.11709557745305478, 0.03670014232201012, -0.11157199129091551, -0.22181137337588314, 0.44410019386559724, 0.04462569215776105, 0.2064757345930526, 0.005012673021931397, 0.1957107821288733, 0.17079066213612493, 0.0005072343212209249, 0.019733164104093846, 0.21700148148566337, 0.18230466934313116, 0.1053243658848499, -0.24747957954379288, -0.0038668732599992503, 0.17965779309896263]
|
707.077
|
Conditional displacement operator for traveling fields
|
We show that the conditional displacement operator $\hat{U}_{CD}=\exp
[\hat{b}^{\dagger}\hat{b}(\beta \hat{a}^{\dagger}-\beta ^{\ast}\hat{a})]$
acting upon an arbitrary state of traveling waves can be well approximated by
the action of a Kerr medium placed between two beam splitters whose respective
second ports are fed by highly excited coherent states. Applications to the
generation of nonclassical states and measurement of Wigner function of
arbitrary states are also considered.
|
quant-ph
|
we show that the conditional displacement operator hatu_cdexp hatbdaggerhatbbeta hatadaggerbeta asthata acting upon an arbitrary state of traveling waves can be well approximated by the action of a kerr medium placed between two beam splitters whose respective second ports are fed by highly excited coherent states applications to the generation of nonclassical states and measurement of wigner function of arbitrary states are also considered
|
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|
[-0.16141196600316712, 0.2953314717648027, -0.04848119545883189, 0.01278675530726711, -0.030850976230188582, -0.1450988242480283, -0.0017745000368449837, 0.4039815958434095, -0.2749814212322235, -0.2539640171763798, 0.059705562167800964, -0.288388748979196, -0.09338241592049598, 0.20669117954482014, 0.021154051980314156, 0.10968679728878973, 0.045951542432885614, 0.027363852163155875, -0.02510822655555482, -0.16029749278289576, 0.36518924571573735, 0.01290024221719553, 0.30030719325877725, 0.012531581606405476, 0.1554717853665352, 0.04647197804879397, 0.03708137866730491, -0.015273964001486699, -0.0025714689134474613, 0.11323991784302052, 0.2427909192163497, 0.08748084141407161, 0.23279126236060013, -0.4907403697104504, -0.19869194912413757, 0.06591487713158131, 0.11951411897365082, 0.14436683111513654, -0.02333330687445899, -0.3878107636235654, -0.010239646983488152, -0.1644843943727513, -0.1665170008316636, -0.07037928631373992, -0.0006186663483579954, 0.0898726073714594, -0.263881157261009, 0.048127938922940906, 0.05575815062620677, -0.03992279268180331, -0.0543242345796898, -0.07673013686823348, -0.08797957159889241, 0.12127300722058862, -0.06598173500970006, 0.0005285916306699316, 0.14751152717217336, -0.1290797257175048, -0.1336488882234941, 0.3345151044117908, -0.09435449781206746, -0.25906262525822965, 0.12379647733954093, -0.15346122781435648, 0.02168087389630576, 0.0843251130077988, 0.20544145599318048, 0.16358855863412222, -0.08420988112920895, -0.023373355833852354, -0.03735052949438492, 0.17540137542722126, 0.16437625097266087, 0.11556125278584659, 0.20459653860889376, 0.05789107309343914, 0.08400362530567994, 0.2072088529879693, -0.034770293595890206, -0.08535367051760355, -0.3435032010699312, -0.12379196349841853, -0.23699833379747967, 0.05712620948130886, -0.02738917665143769, -0.14995979148273667, 0.4060183837466563, 0.03930849606792132, 0.19383131673093884, -0.01955833121513327, 0.28220892476383597, 0.1977011567214504, 0.011395666701719164, 0.05682987825324138, 0.27082828084627786, 0.19723852794850244, 0.01737240959579746, -0.22511122627232302, 0.06478112735785543, 0.03823026483878493]
|
707.0771
|
Local properties of J-complex curves in Lipschitz-continuous structures
|
We prove the existence of primitive curves and positivity of intersections of
$J$-complex curves for Lipschitz-continuous almost complex structures. These
results are deduced from the Comparison Theorem for $J$-holomorphic maps in
Lipschitz structures, previously known for $J$ of class $C^{1, Lip}$. We also
give the optimal regularity of curves in Lipschitz structures. It occurs to be
$C^{1,LnLip}$, i.e. the first derivatives of a $J$-complex curve for Lipschitz
$J$ are Log-Lipschitz-continuous. A simple example that nothing better can be
achieved is given. Further we prove the Genus Formula for $J$-complex curves
and determine their principal Puisieux exponents (all this for
Lipschitz-continuous $J$-s).
|
math.CV math.SG
|
we prove the existence of primitive curves and positivity of intersections of jcomplex curves for lipschitzcontinuous almost complex structures these results are deduced from the comparison theorem for jholomorphic maps in lipschitz structures previously known for j of class c1 lip we also give the optimal regularity of curves in lipschitz structures it occurs to be c1lnlip ie the first derivatives of a jcomplex curve for lipschitz j are loglipschitzcontinuous a simple example that nothing better can be achieved is given further we prove the genus formula for jcomplex curves and determine their principal puisieux exponents all this for lipschitzcontinuous js
|
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|
[-0.1663850586082102, 0.03376838058822465, -0.1118527455968136, 0.1131663344401334, -0.09871025314573578, -0.14913356942789896, 0.016981775482774387, 0.39310155743946873, -0.3095429405113872, -0.21590934662452463, 0.12753771913560982, -0.24281028285622597, -0.16254432966970667, 0.29231660585014185, -0.12423704556137209, 0.07404035546493773, 0.028537764986121684, 0.02186690521787624, -0.08094881042334422, -0.2893353881259753, 0.3597996864391833, -0.09343471231054258, 0.18150913385420145, 0.07159891505535616, 0.08487512288396531, -0.02197340892672976, -0.018360224077287986, -0.004968682007046835, -0.1984803374142924, 0.14959337444481802, 0.26979524716473546, 0.08722491737702215, 0.1647322659098011, -0.3585781039318488, -0.21854316863725531, 0.187850485604532, 0.07122265978488235, 0.037145412919035524, -0.010672849636258823, -0.22058678300557089, 0.147352598998363, -0.05076917397732637, -0.21791473643055984, -0.11877399094269744, 0.05049220154689131, 0.08163531194797394, -0.26509841407022, 0.08044254377618555, 0.1476122772093026, 0.13280155031694746, -0.12220336668839564, -0.11416173403445935, -0.08174577149638564, 0.0935375428834588, -0.0016499671803511754, 0.05299846593727719, 0.046858456047555924, -0.08798867249528744, -0.0946496261274252, 0.32926764555883653, -0.05909256275020996, -0.21404544484554505, 0.13974935208846415, -0.14733041055994678, -0.14815834769503955, 0.13373141155141044, 0.1136523361403343, 0.18098329750782982, -0.09229798915282804, 0.11892569652278623, -0.08524965477765215, 0.09318796342846994, 0.12653752082806766, -0.012765771704630889, 0.09071515825558074, 0.029803263550928355, 0.11969861348292657, 0.1377023374234155, -0.011876383292659814, -0.05797312675728178, -0.35828995792081164, -0.20838529058751099, -0.13633255541861553, 0.09895958645953512, -0.13332633114371173, -0.16825515819637446, 0.37590373125003307, 0.05317524288381849, 0.20737515105770862, 0.165194308907934, 0.2093270102857935, 0.10712238534220628, 0.01969029660555249, 0.11525254707536375, 0.22410299508281203, 0.14736190092350757, 0.020498745974951556, -0.10714092890598945, 0.07725528559210348, 0.15014347449249152]
|
707.0772
|
Regulators of rank one quadratic twists
|
We investigate the regulators of elliptic curves with rank 1 in some families
of quadratic twists of a fixed elliptic curve. In particular, we formulate some
conjectures on the average size of these regulators. We also describe an
efficient algorithm to compute explicitly some of the invariants of an odd
quadratic twist of an elliptic curve (regulator, order of the Tate-Shafarevich
group, etc.) and we discuss the numerical data that we obtain and compare it
with our predictions.
|
math.NT
|
we investigate the regulators of elliptic curves with rank 1 in some families of quadratic twists of a fixed elliptic curve in particular we formulate some conjectures on the average size of these regulators we also describe an efficient algorithm to compute explicitly some of the invariants of an odd quadratic twist of an elliptic curve regulator order of the tateshafarevich group etc and we discuss the numerical data that we obtain and compare it with our predictions
|
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|
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|
707.0773
|
Four-fermion production near the W pair production threshold
|
We perform a dedicated study of the four-fermion production process e- e+ ->
mu- nubar_mu u dbar X near the W pair-production threshold in view of the
importance of this process for a precise measurement of the W boson mass.
Accurate theoretical predictions for this process require a systematic
treatment of finite-width effects. We use unstable-particle effective field
theory (EFT) to perform an expansion in the coupling constants, GammaW/MW, and
the non-relativistic velocity v of the W boson up to next-to-leading order in
GammaW/MW ~ alpha_ew ~ v^2. We find that the dominant theoretical uncertainty
in MW is currently due to an incomplete treatment of initial-state radiation.
The remaining uncertainty of the NLO EFT calculation translates into delta MW ~
10-15 MeV, and to about 5 MeV with additional input from the NLO four-fermion
calculation in the full theory.
|
hep-ph hep-ex
|
we perform a dedicated study of the fourfermion production process e e mu nubar_mu u dbar x near the w pairproduction threshold in view of the importance of this process for a precise measurement of the w boson mass accurate theoretical predictions for this process require a systematic treatment of finitewidth effects we use unstableparticle effective field theory eft to perform an expansion in the coupling constants gammawmw and the nonrelativistic velocity v of the w boson up to nexttoleading order in gammawmw alpha_ew v2 we find that the dominant theoretical uncertainty in mw is currently due to an incomplete treatment of initialstate radiation the remaining uncertainty of the nlo eft calculation translates into delta mw 1015 mev and to about 5 mev with additional input from the nlo fourfermion calculation in the full theory
|
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|
[-0.08537006338384114, 0.14837381441372885, -0.05697332933517312, 0.0869576337548626, -0.04710992262915903, -0.07909594638856934, 0.08855614397473244, 0.35133261433733043, -0.21046849289811703, -0.2894477512020229, -0.04971019965127361, -0.3128122642719701, 0.019148506543863176, 0.13579554337688457, 0.03648357292109016, 0.07616623920569224, 0.088626478656209, 0.036382165928579756, -0.057954457555480524, -0.19428585696645748, 0.2728127936429497, 0.0777604078957394, 0.17662242717637833, 0.11750723853874118, 0.04233910338327622, 0.05731567384591743, -0.0655507490698269, -0.10050152747808441, -0.17848516836330866, 0.09708932393105395, 0.21527073367428445, 0.017869515584281355, 0.21504505250060849, -0.34916591736029334, -0.15532819733524056, 0.07874529227378096, 0.11537081208219056, 0.10877929273436764, -0.0029660683653470296, -0.2673791322766789, 0.08666947131469123, -0.23075514978993295, -0.15589642664417624, -0.06346765461850411, 0.043359685158391774, -0.09240050210249123, -0.34739247943733387, 0.11092246675046348, 0.013868694854795988, 0.0271431767805688, 0.017721364421443318, -0.1722238964345584, -0.028057075341913238, 0.06057800731010068, 0.06781782288171191, 0.12240652780833919, 0.15095954603487766, -0.17257072553803116, -0.1115211162580622, 0.42220680082022255, -0.10206395027370178, -0.15094296987265793, 0.09781712365211613, -0.18592971596960672, -0.1357716263668028, 0.1719524256151809, 0.2050398340285408, 0.08440584334920147, -0.17018944485140824, 0.17123370340924515, 0.05359624306725185, 0.1684360336668706, 0.04733463334711963, 0.03170096400974026, 0.1489288304904615, 0.17217426643178646, 0.0036328978204071076, 0.026222940308472782, -0.07735092867749618, -0.06014512538207945, -0.4299546153607792, -0.09556181545431444, -0.06806642014825189, 0.12345847635401357, -0.10675802126108953, -0.12524817023189988, 0.34692295700478465, 0.183456953494191, 0.22373909645699966, -0.00355723702154164, 0.31038322542974756, 0.13548297269631232, 0.04831736592172798, 0.022075936764673287, 0.3034999565318672, 0.18513320039699518, 0.06347026843091112, -0.24956159875554434, -0.027132970002938562, 0.04882259096343456]
|
707.0774
|
Caratheodory-Fejer interpolation and related topics in locally convex
spaces
|
We study Caratheodory-Herglotz functions whose values are continuous
operators from a locally convex topological space which admits the
factorization property into its conjugate dual space. We show how this case can
be reduced to the case of functions whose values are bounded operators from a
Hilbert space into itself.
|
math.FA math.CV
|
we study caratheodoryherglotz functions whose values are continuous operators from a locally convex topological space which admits the factorization property into its conjugate dual space we show how this case can be reduced to the case of functions whose values are bounded operators from a hilbert space into itself
|
[['we', 'study', 'caratheodoryherglotz', 'functions', 'whose', 'values', 'are', 'continuous', 'operators', 'from', 'a', 'locally', 'convex', 'topological', 'space', 'which', 'admits', 'the', 'factorization', 'property', 'into', 'its', 'conjugate', 'dual', 'space', 'we', 'show', 'how', 'this', 'case', 'can', 'be', 'reduced', 'to', 'the', 'case', 'of', 'functions', 'whose', 'values', 'are', 'bounded', 'operators', 'from', 'a', 'hilbert', 'space', 'into', 'itself']]
|
[-0.09003410100316007, 0.18128443940076977, -0.1257550088048447, 0.056272115032091584, -0.11049520535743795, -0.07533645153550121, -0.002461859776910084, 0.37961979893346626, -0.37050313455983996, -0.12681074999272823, 0.14908551186090335, -0.2646724012253496, -0.18006505606657205, 0.191636274374711, -0.06335683818906546, 0.02578925998568593, 0.03069736307952553, 0.0472270567358161, -0.1952894968514253, -0.23648401345902434, 0.42047986496860784, -0.08471531607210636, 0.1991670290250719, 0.017155911851053435, 0.11896820375598811, 0.003445361896107594, 0.021286296716425568, 0.0677885908207827, -0.09814088576240465, 0.13142903925230107, 0.2736711674854935, 0.1375369803281501, 0.26695476420475944, -0.3849254140319924, -0.18286325369748133, 0.23884472056912878, 0.11853338564590861, -0.006775629466574173, 0.0174416540733849, -0.30584238239680417, 0.0887863013582925, -0.13149880893373242, -0.09878411279836048, -0.14338051651914915, -0.019041230902075768, -0.011163282232397856, -0.2984855143974225, -0.027690876003665228, 0.05596859904471785, -0.02061422060554226, -0.1285285055079536, -0.07900667466068019, -0.09470703966993217, 0.07843703523394652, -0.015782587016777445, 0.08921449757084095, 0.10075204249975893, -0.05098948491407403, -0.08295963680575369, 0.36970926041249186, -0.04886255710031643, -0.3590603055199608, 0.1393225612991955, -0.2051054903616508, -0.10671272745821625, 0.1092558727832511, 0.18048226858566827, 0.17471581615973264, -0.08198785349183406, 0.2328037655679509, -0.10444021209453543, 0.11461577850665587, 0.009640804821780572, 0.10845485407238205, 0.13763525927788578, 0.04663163279959311, 0.14734384190523997, 0.2227219204820964, 0.06367775710532442, -0.12266990823263768, -0.36004793393658474, -0.1632594084367156, -0.18046819978917483, 0.0718563892878592, -0.10617043378321493, -0.2070424558284382, 0.42448794668113504, 0.020236616420637194, 0.2643455455157285, 0.09092974073185663, 0.24915300821885467, 0.211663298192434, 0.09923730211448856, 0.0906722655442233, 0.13539878168376163, 0.10837596340570599, 0.002097305880549053, -0.14294152756338008, 0.019422160607064143, 0.1948654623808276]
|
707.0775
|
Instanton constituents in the O(3) model at finite temperature
|
It is shown that instantons in the O(3) model at finite temperature consist
of fractional charge constituents and the (topological) properties of the
latter are discussed.
|
hep-th cond-mat.str-el hep-lat hep-ph
|
it is shown that instantons in the o3 model at finite temperature consist of fractional charge constituents and the topological properties of the latter are discussed
|
[['it', 'is', 'shown', 'that', 'instantons', 'in', 'the', 'o3', 'model', 'at', 'finite', 'temperature', 'consist', 'of', 'fractional', 'charge', 'constituents', 'and', 'the', 'topological', 'properties', 'of', 'the', 'latter', 'are', 'discussed']]
|
[-0.12838781524288395, 0.26005856040865183, -0.04717815103224264, 0.07145198938311435, 0.025491646132790126, -0.07588237430900335, -0.0496954122164215, 0.3382197558306731, -0.21489611798180983, -0.22877904744102404, 0.0952024444928751, -0.3334321874337128, -0.1401837310538842, 0.13791227966654473, 0.00925347230468805, 0.03131121608357017, -0.08356670630522646, 0.057786414256462686, -0.06118712104104746, -0.24322126662501922, 0.2876858554708843, -0.02554582653997036, 0.28969557497363824, 0.10038986940008517, 0.06994822743133856, -0.0818825143102843, -0.017023733243919335, 0.029323434707923576, -0.10824966293792106, 0.020915675048644725, 0.2369766249679602, -0.03744184397734129, 0.11457772912959066, -0.42199684786968505, -0.2638011287826185, 0.07323332134490976, 0.0711599904148338, 0.09236576164571139, -0.047488380796634234, -0.2569294636352704, 0.12368930912075135, -0.14919134774670686, -0.1830898611089931, -0.0733187748835637, 0.07736151636793064, 0.03612903627352072, -0.1798681625379966, 0.1079623455611559, 0.08313664035477604, 0.022746869255430423, -0.09398000148268273, -0.17853355801735932, -0.16790499138789108, 0.07537453612670876, 0.0847792023873458, -0.008157066015813213, 0.09844456183222625, -0.15382520356573737, -0.08254386011797649, 0.396035409747408, -0.02771035273774312, -0.23700495006946418, 0.1897208862579786, -0.1638960148064563, -0.12716701900801405, 0.16059968231890637, 0.07343937422956515, 0.14322213554539934, -0.11875423448733412, 0.14443708529758553, -0.017566679967925526, 0.14932740250459084, 0.02486149470608395, 0.11810048717933778, 0.2765476372307883, 0.18771795778033826, 0.06541616193806896, 0.1620449787722184, -0.03436105297161983, -0.16552839485498574, -0.34633139399095225, -0.16957193777824825, -0.2037206903959696, 0.03523705745688998, -0.059201600763816926, -0.18109719628409948, 0.3916769405970207, 0.1515862479662666, 0.15790724933433992, -0.043282568598022826, 0.1963015117754157, 0.15329942114364642, 0.08170260485404959, 0.004438946220593957, 0.22300441924016923, 0.1722898597184282, 0.05906740843784064, -0.28589030242381763, -0.0015990606938990264, 0.13668263777911377]
|
707.0776
|
Damping of bulk excitations over an elongated BEC - the role of radial
modes
|
We report the measurement of Beliaev damping of bulk excitations in cigar
shaped Bose Einstein condensates of atomic vapor. By using post selection,
excitation line shapes of the total population are compared with those of the
undamped excitations. We find that the damping depends on the initial
excitation energy of the decaying quasi particle, as well as on the excitation
momentum. We model the condensate as an infinite cylinder and calculate the
damping rates of the different radial modes. The derived damping rates are in
good agreement with the experimentally measured ones. The damping rates
strongly depend on the destructive interference between pathways for damping,
due to the quantum many-body nature of both excitation and damping products.
|
cond-mat.other
|
we report the measurement of beliaev damping of bulk excitations in cigar shaped bose einstein condensates of atomic vapor by using post selection excitation line shapes of the total population are compared with those of the undamped excitations we find that the damping depends on the initial excitation energy of the decaying quasi particle as well as on the excitation momentum we model the condensate as an infinite cylinder and calculate the damping rates of the different radial modes the derived damping rates are in good agreement with the experimentally measured ones the damping rates strongly depend on the destructive interference between pathways for damping due to the quantum manybody nature of both excitation and damping products
|
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|
[-0.16620721832777446, 0.2242432348640351, -0.051630088991811894, 0.06234981312265254, 0.0002833056367105908, -0.10650212026368348, 0.010911620021041514, 0.35305994203807706, -0.2089651154561175, -0.26288232958724356, 0.027166222548012774, -0.27800598897390133, -0.06555989143263517, 0.21103351811070442, 0.061935996525308006, 0.05719903045389642, 0.04027013669713822, 0.00675429055132927, -0.032395096589277826, -0.18947133362993726, 0.3444386227852386, 0.0954732349825004, 0.3168085022773753, 0.06145386553258022, 0.05002474107254201, 0.003708128652209018, 0.017487549517526586, -0.0492130016717009, -0.1963957874883592, 0.02654456595181782, 0.16642967030270678, -0.021887206436636355, 0.19287903270978704, -0.42406064574407715, -0.18324584336667799, 0.026096284178555265, 0.19614123761291719, 0.1975004172557567, -0.021768586327019345, -0.27487548063986766, -0.055983954738093235, -0.16813589425177441, -0.1359246564654904, -0.06632577012985563, 0.03253485211449811, 0.08227706706533447, -0.25679442067192787, 0.1618459206054576, 0.04981156199887936, 0.0535351543321123, -0.13963077352859843, -0.11684035358584335, -0.0815839377255776, 0.07461440152464768, 0.05523425711788492, -0.033683661482909806, 0.1793102083576477, -0.14851149761826438, -0.09610377312598066, 0.38154211251510894, -0.1385125911388642, -0.18347431848255488, 0.21147487467576742, -0.18503548564492828, 0.010322191442052523, 0.1859951555633392, 0.16422309522003603, 0.08197339960079417, -0.0747988434572123, 0.025679519028864548, -0.000519865685994299, 0.14477282631983104, 0.13119173619466332, 0.14048834248095438, 0.21215777470069563, 0.13550739540244874, -0.018608470442386456, 0.13353731934405053, -0.10862425248373427, -0.10998512935848573, -0.2827613526979127, -0.09288759224721764, -0.18846005701428103, 0.040561130515132576, -0.03727464911773697, -0.17630235669223002, 0.3911159126103943, 0.08529667722252317, 0.23606092166792378, 0.022177289994274322, 0.28472851001076466, 0.1860684325060863, 0.03290476957256468, 0.03956570791908436, 0.32148475592366904, 0.18297837954213542, 0.07170056682239231, -0.37625583140259117, 0.03576823896091654, 0.004512942302574078]
|
707.0777
|
An extension of the SHARC survey
|
We report on our search for distant clusters of galaxies based on optical and
X-ray follow up observations of X-ray candidates from the SHARC survey. Based
on the assumption that the absence of bright optical or radio counterparts to
possibly extended X-ray sources could be distant clusters. We have obtained
deep optical images and redshifts for several of these objects and analyzed
archive XMM-Newton or Chandra data where applicable. In our list of candidate
clusters, two are probably galaxy structures at redshifts of z$\sim$0.51 and
0.28. Seven other structures are possibly galaxy clusters between z$\sim$0.3
and 1. Three sources are identified with QSOs and are thus likely to be X-ray
point sources, and six more also probably fall in this category. One X-ray
source is spurious or variable. For 17 other sources, the data are too sparse
at this time to put forward any hypothesis on their nature. We also
serendipitously detected a cluster at z=0.53 and another galaxy concentration
which is probably a structure with a redshift in the [0.15-0.6] range. We
discuss these results within the context of future space missions to
demonstrate the necessity of a wide field of view telescope optimized for the
0.5-2 keV range.
|
astro-ph
|
we report on our search for distant clusters of galaxies based on optical and xray follow up observations of xray candidates from the sharc survey based on the assumption that the absence of bright optical or radio counterparts to possibly extended xray sources could be distant clusters we have obtained deep optical images and redshifts for several of these objects and analyzed archive xmmnewton or chandra data where applicable in our list of candidate clusters two are probably galaxy structures at redshifts of zsim051 and 028 seven other structures are possibly galaxy clusters between zsim03 and 1 three sources are identified with qsos and are thus likely to be xray point sources and six more also probably fall in this category one xray source is spurious or variable for 17 other sources the data are too sparse at this time to put forward any hypothesis on their nature we also serendipitously detected a cluster at z053 and another galaxy concentration which is probably a structure with a redshift in the 01506 range we discuss these results within the context of future space missions to demonstrate the necessity of a wide field of view telescope optimized for the 052 kev range
|
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|
[-0.06335889228359895, 0.08328290530550644, -0.07120265094703765, 0.09806732872463575, -0.12493083597249796, -0.08531059870430872, 0.08444136735426272, 0.48663736258319873, -0.18015876817446783, -0.3754610828563908, 0.12621383593902086, -0.3450840513816281, -0.03164972439987454, 0.2560205354458236, 0.013096791934268784, -0.03743563609281976, 0.06252983465835209, -0.06726506002944656, -0.01968958302119913, -0.2996429205654498, 0.3127432458439664, 0.061778472983202284, 0.18950570329331123, -0.045023825580029556, 0.08166355968818031, -0.05772205944531059, -0.09606884751262976, -0.0005088664531934745, -0.07010654207315657, 0.09229846933655365, 0.28590222173978824, 0.11396538310458453, 0.2228609377011685, -0.34030550888308964, -0.22651612285838169, 0.07464343995492362, 0.16109240870751984, 0.04314792313175416, -0.06721618534663946, -0.32342360269081727, 0.09946108410391143, -0.1349602516900851, -0.14500770320994172, 0.030422031884105062, 0.019684287504147944, 0.05303407164908309, -0.1762799405093286, 0.11135810056915413, -0.026141377343754074, 0.06542110382275067, -0.15386611383160267, -0.09528201799980135, 0.009189031790619032, 0.07996403680875636, -0.012880830995705746, 0.05765910762018201, 0.13317645621724689, -0.1357376442183202, -0.0810101363929597, 0.3910288341745884, 0.0071131574298868225, -0.004612887963821091, 0.24602367242358872, -0.17388561142411962, -0.2378980564795921, 0.13056310882204536, 0.1638784551883032, 0.1131563231199231, -0.17722411083096132, -0.006209695072910144, -0.006577188786746345, 0.22285759110947317, 0.046775095119145724, 0.1091195926407028, 0.312541870933831, 0.08999399326907837, 0.030820805157052735, 0.12856804978789238, -0.25398954943561897, 0.011573281011605008, -0.2529078894634099, -0.07501159907182932, -0.13144691648130216, 0.0648140283444798, -0.0993142620813635, -0.11469624810337309, 0.3309180581352519, 0.12592568532411647, 0.20294363459867037, 0.047970549473141194, 0.26687870892794363, 0.047356411277658154, 0.10671368371414479, 0.07292567548253129, 0.2992860515105852, 0.08942124181679782, 0.06457722946842337, -0.12887033203560577, 0.02744721095007493, -0.029010531519148872]
|
707.0778
|
On the applications of Hardy class functions in scattering theory
|
This paper is a response to an article (R. de la Madrid, Journal of Physics
A: Mathematical and General, 39,9255-9268 (2006)) recently published in Journal
of Physics A: Mathematical and Theoretical. The article claims that the theory
of resonances and decaying states based on certain rigged Hilbert spaces of
Hardy functions is physically untenable. In this paper we show that all of the
key conclusions of the cited article are the result of either the errors in
mathematical reasoning or an inadequate understanding of the literature on the
subject.
|
math-ph math.MP
|
this paper is a response to an article r de la madrid journal of physics a mathematical and general 3992559268 2006 recently published in journal of physics a mathematical and theoretical the article claims that the theory of resonances and decaying states based on certain rigged hilbert spaces of hardy functions is physically untenable in this paper we show that all of the key conclusions of the cited article are the result of either the errors in mathematical reasoning or an inadequate understanding of the literature on the subject
|
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|
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|
707.0779
|
Note sur les invariants du groupe affine
|
In the paper, it is proved that any $C^{1}$-function on GL(n) which is
locally $P$-invariant (here $P$ is the affine (sub)group of GL(n)) is locally
$G$-invairant. There is also a statement for distributions (a very weak form of
Baruch's results).
|
math.RT
|
in the paper it is proved that any c1function on gln which is locally pinvariant here p is the affine subgroup of gln is locally ginvairant there is also a statement for distributions a very weak form of baruchs results
|
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|
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|
707.078
|
Non-commutative Zariski geometries and their classical limit
|
We undertake a case study of two series of nonclassical Zariski geometries.
We show that these geometries can be realised as representations of certain
noncommutative $C^*$-algebras and introduce a natural limit construction which
for each of the two series produces a classical U(1)-gauge field over a
2-dimensional Riemann surface.
|
math.QA math.LO
|
we undertake a case study of two series of nonclassical zariski geometries we show that these geometries can be realised as representations of certain noncommutative calgebras and introduce a natural limit construction which for each of the two series produces a classical u1gauge field over a 2dimensional riemann surface
|
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|
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|
707.0781
|
Nonperturbative equation of state of quark-gluon plasma. Applications
|
The vacuum-driven nonperturbative factors $L_i$ for quark and gluon Green's
functions are shown to define the nonperturbative dynamics of QGP in the
leading approximation. EoS obtained recently in the framework of this approach
is compared in detail with known lattice data for $\mu=0$ including $P/T^4$,
$\epsilon/T^4$, $\frac{\epsilon-3P}{T^4}$. The basic role in the dynamics at
$T\la 3T_c$ is played by the factors $L_i$ which are approximately equal to the
modulus of Polyakov line for quark $L_{fund}$ and gluon $L_{adj}$. The
properties of $L_i$ are derived from field correlators and compared to lattice
data, in particular the Casimir scaling property $L_{adj}
=(L_{fund})^{\frac{C_2(adj)}{C_2(fund)}}$ follows in the Gaussian approximation
valid for small vacuum correlation lengths. Resulting curves for $P/T^4$,
$\epsilon/T^4$, $\frac{\epsilon-3P}{T^4}$ are in a reasonable agreement with
lattice data, the remaining difference points out to an effective attraction
among QGP constituents.
|
hep-ph
|
the vacuumdriven nonperturbative factors l_i for quark and gluon greens functions are shown to define the nonperturbative dynamics of qgp in the leading approximation eos obtained recently in the framework of this approach is compared in detail with known lattice data for mu0 including pt4 epsilont4 fracepsilon3pt4 the basic role in the dynamics at tla 3t_c is played by the factors l_i which are approximately equal to the modulus of polyakov line for quark l_fund and gluon l_adj the properties of l_i are derived from field correlators and compared to lattice data in particular the casimir scaling property l_adj l_fundfracc_2adjc_2fund follows in the gaussian approximation valid for small vacuum correlation lengths resulting curves for pt4 epsilont4 fracepsilon3pt4 are in a reasonable agreement with lattice data the remaining difference points out to an effective attraction among qgp constituents
|
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|
[-0.08516325656358395, 0.18916115891786012, -0.1253880876230204, 0.10312446699395975, -0.010531845083104745, -0.08163263045521524, 0.017557850260401273, 0.3701809332386114, -0.2080506678414709, -0.2176581340777965, 0.023354777214046257, -0.3038321792624379, -0.042267404990768385, 0.1555037861192272, 0.034752636479626176, 0.0873861251654857, 0.013361438143756668, 0.04488912325722116, -0.06641944828407682, -0.23370501913133837, 0.33215698409285255, 0.011942086659570915, 0.2602618801485719, 0.11209917354632083, 0.05577246288374379, 0.003996440282318997, -0.02642239090757274, -0.004930141076218081, -0.1498623184845534, 0.06575947895091568, 0.22684796378265298, 0.003161832526724302, 0.15000336196892078, -0.3750270159474311, -0.17629493268754134, 0.07000998736142344, 0.13786429260459282, 0.06922403864721582, 0.020392848747490925, -0.22440694841975703, 0.07442939842034502, -0.14848817714298043, -0.17512259404583772, -0.10518444513631914, 0.04438550692168953, 0.0015997985655171725, -0.32700740923493643, 0.10974491822763474, -0.020386471711667895, 0.042590828980354746, -0.027578746556937126, -0.2095709143327336, -0.01579829243692491, 0.10494156288807742, 0.08596985615462861, 0.09826304599329944, 0.10237087532593549, -0.21231412976617633, -0.0864138265272766, 0.4217063583369644, -0.05443725729439379, -0.17070104104985717, 0.12033767430538325, -0.14761060449465369, -0.11451418193071398, 0.1284696543411501, 0.12694970437659675, 0.07098704136735653, -0.18698117503085893, 0.12579731195000932, -0.015237794058639129, 0.12223131792932634, 0.08952692746120783, 0.05883715099086123, 0.18332514048106116, 0.1377974406083804, -0.01960368908031751, 0.1317623963887014, -0.014180940469257703, -0.15242254287573218, -0.3555928052879358, -0.07295733382783205, -0.16231433697087505, 0.031890728795289536, -0.1466288354812334, -0.14925166519375638, 0.3406231684596029, 0.11144326207004061, 0.20057155497244183, 0.046951302562712315, 0.24641932500704042, 0.12339712950962646, 0.08117544580560235, 0.0949105120313759, 0.24833312155394496, 0.19019222914468753, 0.07318454942104356, -0.27023929233648564, 0.0038779153353499093, 0.11984331959872756]
|
707.0782
|
Notes sur la notion d'invariant caract\'eristique
|
Let $G$ be a Lie group acting on a vector space $V$. Given a set of
$G$-invariants, one can ask the question : does this set of invariants
characterize the group $G$ ? We recall here some known results, ask questions
and state some conjectures for different choices of invariants : polynomial
functions, orbits, distributions, and different types of groups.
|
math.RT
|
let g be a lie group acting on a vector space v given a set of ginvariants one can ask the question does this set of invariants characterize the group g we recall here some known results ask questions and state some conjectures for different choices of invariants polynomial functions orbits distributions and different types of groups
|
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|
[-0.2127725209779384, 0.1304735252143521, -0.10844262838853817, 0.06503025434805047, -0.14444546836117902, -0.1453051380568037, 0.04997206453168601, 0.3518635456107165, -0.33348175788526996, -0.29340488724247143, 0.08657729320571218, -0.24165750273683093, -0.14065846452783598, 0.22186642002902532, -0.12998100477189087, -0.04066680149551023, 0.07576893118063086, 0.13687212663302362, -0.12406178563833237, -0.332824010712405, 0.4074489296528331, -0.11308845631745562, 0.17095615997453006, 0.011975005056643695, 0.11190947133786323, -0.016001881059389888, -0.025952781918213555, 0.0015723505501610863, -0.20081799446294704, 0.09772217859669279, 0.2765316001727785, 0.14774713984674268, 0.2822924240475945, -0.3411461767136005, -0.17328825950001678, 0.22068316836048962, 0.10253653374297357, 0.0006208908825851323, 0.02220841257612368, -0.28724599900867853, 0.09692366996355224, -0.1361237916474541, -0.13281091330409572, -0.08361719754573546, 0.10537757987581324, 0.010169173615347398, -0.2385413679375983, -0.060240243855667744, 0.05196481157633427, 0.08058634654847546, -0.05675562421317425, -0.147190563903566, -0.03716376824141072, 0.14954935827112772, -0.0413565623263518, 0.04045388594335109, 0.12694173225348718, -0.10173330049994483, -0.18464689752446456, 0.4341309467788067, -0.02755230890685006, -0.26142125156005486, 0.17615772896495305, -0.20804379695797698, -0.18950562270586951, 0.007418515826493763, 0.13979454160455548, 0.1670992821291612, -0.044937010625736754, 0.12824894077544868, -0.16803512558863873, 0.0842730946381364, 0.09108862913164653, 0.02119912888462606, 0.16333967517538553, 0.033675848432865585, 0.0702898197219168, 0.0712939876462578, 0.0686994652333261, 0.07896986340679098, -0.35433495628010286, -0.14197447588830664, -0.12212197410694339, 0.11940399668457215, -0.0953887182021342, -0.14071627206724593, 0.441591068636626, 0.10042358329928104, 0.20623426662202468, 0.08602738834656122, 0.15429362690631757, 0.05994159347232709, -0.011225951132936436, 0.10343382375216797, 0.03801458468354356, 0.20044622959144281, -0.08656927903199144, -0.13011915040643593, 0.023202458306689534, 0.14933186004820623]
|
707.0783
|
Log-canonical threshold for curves on a smooth surface
|
It is shown that the log-canonical threshold of a curve with an isolated
singularity is computed by the term ideal of the curve in a suitable system of
local parameters at the singularity. The proof uses the Enriques diagram of the
singularity and shows that the log-canonical threshold depends only on a
non-degenerate path of that diagram.
|
math.AG
|
it is shown that the logcanonical threshold of a curve with an isolated singularity is computed by the term ideal of the curve in a suitable system of local parameters at the singularity the proof uses the enriques diagram of the singularity and shows that the logcanonical threshold depends only on a nondegenerate path of that diagram
|
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|
[-0.20071259872750952, 0.030298283954994475, -0.19524101044557857, 0.07287726697119835, -0.050643778291710635, -0.166657254957643, 0.07305864325577491, 0.29740279344351667, -0.26904949245222826, -0.2034211352206113, 0.08423640524045352, -0.2724978170896831, -0.17423145473003387, 0.2353408589076839, -0.06649438394723754, -0.0006655144848321614, 0.08703126550831816, 0.13692575058769108, -0.08567796906930182, -0.2644454582610674, 0.45328265899106074, 0.032206027719535325, 0.2455970867324555, 0.07585307729446836, 0.14784422015215745, 0.03218919914134108, 0.05511051971922841, 0.018637081640854217, -0.1637223517141058, 0.04583590056158995, 0.19765001166154417, 0.07924125388493403, 0.1672624087516676, -0.31524084750236125, -0.19330272257426068, 0.12310269535437487, 0.12973535761825347, 0.06134624189386765, -0.009824410225918288, -0.19075778401211688, 0.13712267571112566, -0.12142391426063943, -0.23645182881144838, 0.017767297512475858, 0.04451384228703223, 0.038726023251288814, -0.230278421814243, 0.038503596600014386, 0.11533680463438495, 0.09559541666194012, -0.009428613132944233, -0.04336766329013922, -0.10075993908634573, 0.06354777590910855, -0.039575384774555765, 0.08235309154138361, 0.1122672692790889, -0.1785507349934625, -0.05660248234083778, 0.3446840132145505, -0.07657314227126016, -0.1410889297013024, 0.12392812836588475, -0.14246667167498617, -0.05210418693655938, 0.20982214413060432, 0.006830967390877113, 0.14587967826478315, -0.08288733220021975, 0.15027309877271028, -0.0274938934629685, 0.15269734027893528, 0.05115309980158743, -0.04483938217980035, 0.18010863569820926, 0.14336673598409744, 0.10066412170335912, 0.13704854662513785, -0.07826136221308588, -0.08964331122932204, -0.38584278393210025, -0.17465343408433623, -0.1946821933522363, 0.07029491060478776, -0.12814026574676718, -0.2192113808649306, 0.4141825129065597, 0.04953884423236575, 0.2520840113917202, 0.017169685805575888, 0.2502163732914548, 0.15881432918014757, 0.05780383529501003, 0.05920906435175423, 0.2491426627037295, 0.07768677253880653, 0.023587673649257214, -0.24470060796623952, 0.06380024705114856, 0.1378068765502815]
|
707.0784
|
Role of a spin-flip scatterer in a magnetized Luttinger liquid
|
We study the spin-dependent scattering of charge carriers in a magnetized one
dimensional Luttinger liquid from a localized non-homogeneous magnetic field,
which might be brought about by the stray field of magnetic tip near a uniform
liquid, or by a transverse domain wall (DW) between two oppositely magnetized
liquids.
From a renormalization group treatment of the electron interactions we deduce
scaling equations for the transmission and reflection amplitudes as the
bandwidth is progressively reduced to an energy scale set by the temperature.
The repulsive interactions dictate two possible zero temperature insulator
fixed points: one in which electrons are reflected in the same spin channel and
another where the electron spin is reversed upon reflection. In the latter
case, a finite spin current emerges in the absence of a charge current at zero
temperature and the Friedel oscillations form a transverse spiraling spin
density. Adding a purely potential scattering term has no effect on the fixed
points of a uniformly magnetized liquid. For a DW we find that the introduction
of potential scattering stabilizes the spin-flip insulator phase even if the
single-particle spin-flip scattering produced by the DW is arbitrarily weak.
The potential can be induced externally, e.g. by a local gate voltage or a
constriction, providing a means for controlling the transport properties of the
wire.
|
cond-mat.str-el
|
we study the spindependent scattering of charge carriers in a magnetized one dimensional luttinger liquid from a localized nonhomogeneous magnetic field which might be brought about by the stray field of magnetic tip near a uniform liquid or by a transverse domain wall dw between two oppositely magnetized liquids from a renormalization group treatment of the electron interactions we deduce scaling equations for the transmission and reflection amplitudes as the bandwidth is progressively reduced to an energy scale set by the temperature the repulsive interactions dictate two possible zero temperature insulator fixed points one in which electrons are reflected in the same spin channel and another where the electron spin is reversed upon reflection in the latter case a finite spin current emerges in the absence of a charge current at zero temperature and the friedel oscillations form a transverse spiraling spin density adding a purely potential scattering term has no effect on the fixed points of a uniformly magnetized liquid for a dw we find that the introduction of potential scattering stabilizes the spinflip insulator phase even if the singleparticle spinflip scattering produced by the dw is arbitrarily weak the potential can be induced externally eg by a local gate voltage or a constriction providing a means for controlling the transport properties of the wire
|
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|
[-0.2090465793041437, 0.2693964081856932, -0.07110516983785028, 0.03896476335864497, -0.04836321743938175, -0.15394171475566476, 0.0654130343183944, 0.339344581612817, -0.2879517174679441, -0.2540535328325522, 0.035291114978867374, -0.3022434694985687, -0.06320739823341784, 0.163142099327632, 0.055340627188680054, -0.0252724183207007, -0.024530796794958103, 0.015282067224486835, -0.08753271976133369, -0.15506726140328855, 0.3136994958277447, -0.013541787840141397, 0.28959701531049276, 0.10695751009000189, 0.06942208091021274, 0.06978746512322687, 0.07334415064434763, 0.06855945574568102, -0.10003893395221691, 0.012036601637697054, 0.2053693931768605, -0.1150685858080612, 0.2068673046607593, -0.4764300804429998, -0.21747287075224989, 0.04219829676569336, 0.14752960899979237, 0.16531365353471805, -0.0854197746123612, -0.2933081875639295, 0.0056892039375034745, -0.15979443028940027, -0.18400906149246213, -0.038705819333834504, 0.001131453557280582, 0.014254890139353747, -0.27077099063683785, 0.09293687238823622, 0.09014820123950441, 0.046933268645295394, -0.06033681939677788, -0.05848572910461506, -0.07628612284639126, 0.06446407446263172, 0.06681048207705047, 0.08290386130425355, 0.20390094279233986, -0.17450032847992353, -0.08946483276021253, 0.33110507902219305, -0.07656779682858744, -0.18803886964990482, 0.167696746001268, -0.19116891665099603, 0.005559925385535246, 0.19446320753842075, 0.11421344087230628, 0.080894037224223, -0.146911300260399, 0.0968466359268792, -0.02272115596753321, 0.14199230702070054, 0.08332201336182792, 0.015171906681778771, 0.2998249976932399, 0.1777562119392247, 0.08966770105460589, 0.11965256167416184, -0.13869517001849427, -0.04894700931105978, -0.281344815799794, -0.14219973482950418, -0.22048862295708171, 0.10048629424299751, -0.07696078619112624, -0.17834554867241187, 0.4126394051676875, 0.10656428308074181, 0.17928172736342443, -0.049404127045784625, 0.2879711423948821, 0.16317647978933195, 0.06786912210103495, 0.05703943525548783, 0.2298431148332451, 0.1722568920705709, 0.10184351889701146, -0.3027561204852881, 0.035103319051106356, 0.03888498152998552]
|
707.0785
|
Garside monoids vs divisibility monoids
|
Divisibility monoids (resp. Garside monoids) are a natural algebraic
generalization of Mazurkiewicz trace monoids (resp. spherical Artin monoids),
namely monoids in which the distributivity of the underlying lattices (resp.
the existence of common multiples) is kept as an hypothesis, but the relations
between the generators are not supposed to necessarily be commutations (resp.
be of Coxeter type). Here, we show that the quasi-center of these monoids can
be studied and described similarly, and then we exhibit the intersection
between the two classes of monoids.
|
math.GR cs.DM
|
divisibility monoids resp garside monoids are a natural algebraic generalization of mazurkiewicz trace monoids resp spherical artin monoids namely monoids in which the distributivity of the underlying lattices resp the existence of common multiples is kept as an hypothesis but the relations between the generators are not supposed to necessarily be commutations resp be of coxeter type here we show that the quasicenter of these monoids can be studied and described similarly and then we exhibit the intersection between the two classes of monoids
|
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|
[-0.1438350076254188, 0.14766328334853934, -0.06814382205077682, 0.14252891413536461, -0.1002043208488858, -0.13745520601374467, -0.0420676500098892, 0.37803132618856, -0.46359006785619333, -0.18725763266928583, 0.1071149686180302, -0.29567270057208567, -0.1003059059471251, 0.18080567626327457, -0.14047367684613263, -0.09799840552059103, 0.0075245580063706425, 0.10346071240043335, -0.11032787548568863, -0.2593926821150873, 0.4186540594077613, -0.010541657681565687, 0.22364132686978183, 0.027590233120079858, 0.06555882102742522, -0.06622458348634193, -0.038134062511240505, 0.05234676584915583, -0.13152071877695826, 0.08982878008083138, 0.3539548268294837, 0.0701129763914519, 0.161758127319346, -0.41472784828686393, -0.058027668266994764, 0.249795624436474, 0.10334994026785155, -0.0033976808484890556, -0.012912301996060792, -0.24118876364082098, 0.12102004384105823, -0.17407093176909957, -0.09332729777298777, -0.03629648110111165, 0.07155344208859536, 0.09056356580681112, -0.23501216434783875, -0.015003500074282828, 0.21048575602135206, 0.15344485096406915, -0.033465313450265, -0.10624427152853684, -0.06976584858451802, 0.11363997179117188, -0.018219090899991162, -0.09227467013006828, 0.06251064098036163, -0.06546287559511432, -0.15574999900355216, 0.4374931566417217, 0.033606527440519215, -0.2047714568416487, 0.16715294035664952, -0.15634485377077328, -0.13290371455207287, 0.11726897114506328, 0.043346108766328766, 0.1414564990337534, -0.0628453445430082, 0.14554750003597028, -0.2101384091179773, 0.09208640936447914, 0.16859767373920564, 0.07560246893911655, 0.16850773775837866, 0.05739180138334632, 0.007935853495475757, 0.15979383280079992, 0.11126098294843392, -0.020654697852007235, -0.3383471423154136, -0.18122248009901987, -0.09190226631542017, 0.11190507486928955, -0.07177658569234625, -0.22710478441587773, 0.3267516355782029, 0.09799721693418112, 0.08552680430209393, 0.1786309897756563, 0.14844330841765166, 0.05282076922699764, 0.12004908583272832, 0.06633035838323455, 0.09849588658256703, 0.2595538437501135, -0.06635536812245846, -0.14451340151826586, 0.03524572816284665, 0.23956908690687045]
|
707.0786
|
On the correct formula for the lifetime broadened superconducting
density of states
|
We argue that the well known Dynes formula [Dynes R C {\it et al.} 1978 {\it
Phys. Rev. Lett.} {\bf 41} 1509] for the superconducting quasiparticle density
of states, which tries to incorporate the lifetime broadening in an approximate
way, cannot be justified microscopically for conventional superconductors.
Instead, we propose a new simple formula in which the energy gap has a finite
imaginary part $-\Delta_2$ and the quasiparticle energy is real. We prove that
in the quasiparticle approximation 2$\Delta_2$ gives the quasiparticle decay
rate at the gap edge for conventional superconductors. This conclusion does not
depend on the nature of interactions that cause the quasiparticle decay. The
new formula is tested on the case of a strong coupling superconductor
Pb$_{0.9}$Bi$_{0.1}$ and an excellent agreement with theoretical predictions is
obtained. While both the Dynes formula and the one proposed in this work give
good fits and fit parameters for Pb$_{0.9}$Bi$_{0.1}$, only the latter formula
can be justified microscopically.
|
cond-mat.supr-con
|
we argue that the well known dynes formula dynes r c it et al 1978 it phys rev lett bf 41 1509 for the superconducting quasiparticle density of states which tries to incorporate the lifetime broadening in an approximate way cannot be justified microscopically for conventional superconductors instead we propose a new simple formula in which the energy gap has a finite imaginary part delta_2 and the quasiparticle energy is real we prove that in the quasiparticle approximation 2delta_2 gives the quasiparticle decay rate at the gap edge for conventional superconductors this conclusion does not depend on the nature of interactions that cause the quasiparticle decay the new formula is tested on the case of a strong coupling superconductor pb_09bi_01 and an excellent agreement with theoretical predictions is obtained while both the dynes formula and the one proposed in this work give good fits and fit parameters for pb_09bi_01 only the latter formula can be justified microscopically
|
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|
[-0.10695724055588045, 0.11731867794602478, -0.11206736030790931, 0.07912157656981528, -0.09641225574703156, -0.1474067756340285, 0.11322271353506212, 0.3286973745562136, -0.19007130477377038, -0.2945172522995102, -0.037448264086689755, -0.2770228151562093, -0.12390830784246232, 0.18276170042013348, -0.05568167998284526, 0.017991090228757525, 0.008294490308948804, -0.0017495501220603533, -0.0786021349029144, -0.2326241379317863, 0.2417107875793406, 0.06497689738539578, 0.32353169835596995, 0.13241580225486024, 0.005812559438916513, 0.027450554800821068, 0.04946883921393582, -0.0027415048319233367, -0.19350362788583558, 0.04847426139572753, 0.24257136587955389, 0.01167681763579338, 0.18280971571331536, -0.40173761391587837, -0.21550231582051899, 0.06872074928833172, 0.14991637651846873, 0.14263049950616882, -0.011981620833489902, -0.26226682341112345, 0.07398942329543584, -0.22570403430115762, -0.13269011695763167, -0.12389156090307839, 0.04602313553914428, -0.03791544602813989, -0.2897223372990855, 0.1340546484018346, 0.0688403195464288, 0.011510197541829718, -0.057642283366073535, -0.14165920962850692, 0.0009573299770797544, 0.018128345069133595, 0.0258980705469104, 0.06360249219261864, 0.06357880382462629, -0.05380549861407025, -0.07079394025686846, 0.33263249375822046, -0.08629139900852961, -0.14104126885686588, 0.14091102328870586, -0.1039965681177623, -0.08331941570379311, 0.12271395172036689, 0.05226058820026774, 0.11129139170409445, -0.1529290193420705, 0.1385049929037761, -0.09163516885866234, 0.1537590288031033, 0.034729191172820854, 0.05648140100237458, 0.17813855080712068, 0.12010066902052753, -0.004837036067236781, 0.06581050131169348, -0.09426498112174435, -0.08429361732574946, -0.3287759622952406, -0.15523345467245467, -0.26528585316389325, 0.04696251351487251, -0.011780854862380796, -0.16601657519659288, 0.39175127937806226, 0.13520075499575254, 0.23263518544079004, 0.03355476523814369, 0.24702461124574648, 0.19016709149803354, 0.0658915473090756, 0.1207450282423981, 0.27677237129286875, 0.15258266268109408, 0.08340193687413548, -0.2531215168014051, 0.07210861641583563, 0.05153167037193109]
|
707.0787
|
Symbolic-computation study of integrable properties for the
(2+1)-dimensional Gardner equation with the two-singular-manifold method
|
The singular manifold method from the Painleve analysis can be used to
investigate many important integrable properties for the nonlinear partial
differential equations.In this paper, the two-singular-manifold method is
applied to the (2+1)-dimensional Gardner equation with two Painleve expansion
branches to determine the Hirota bilinear form, Backlund transformation, Lax
pairs and Darboux transformation. Based on the obtained Lax pairs, the binary
Darboux transformation is constructed and the N N Grammian solution is also
derived by performing the iterative algorithm Ntimes with symbolic computation.
|
nlin.SI nlin.PS
|
the singular manifold method from the painleve analysis can be used to investigate many important integrable properties for the nonlinear partial differential equationsin this paper the twosingularmanifold method is applied to the 21dimensional gardner equation with two painleve expansion branches to determine the hirota bilinear form backlund transformation lax pairs and darboux transformation based on the obtained lax pairs the binary darboux transformation is constructed and the n n grammian solution is also derived by performing the iterative algorithm ntimes with symbolic computation
|
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|
[-0.135608781958226, -0.03260368065590539, -0.07891417130055588, 0.0762654832711943, -0.15674896349721565, -0.20662426986027418, -0.06003709355363532, 0.2937931250553669, -0.34301084795648734, -0.20751452657314962, 0.09135560223423853, -0.3116400744311693, -0.2431055146053706, 0.15585226080062367, 0.015387758312011479, 0.12953765522234323, 0.08772930675526945, 0.046970439540994606, -0.18760269287996356, -0.29122845354353694, 0.37544624818625244, -0.0473537542459714, 0.25465038732239387, -0.07754026947361303, 0.18050548040149053, 0.02227692126591758, -0.03780235022465449, -0.10067331828404127, -0.08995046393900383, 0.0889317947894153, 0.296943144918215, 0.12651419899392327, 0.1467604325947965, -0.3708877398337169, -0.1161118992945043, 0.1196541718786537, 0.21311223228666476, 0.12271418827074784, -0.03179350040608835, -0.36495906068721967, 0.03489610932415306, -0.11876197758971191, -0.1873616297763386, -0.12627205526081436, 0.04558576712748263, 0.06266569778913768, -0.27552645836343487, 0.043530342211741346, 0.093183776125221, -0.0013442214055940872, -0.05377561752343687, -0.07350662482402674, -0.0651768503246386, 0.0022956900264522653, -0.0038124757915417233, 0.005730453367549472, 0.027573782768918247, -0.01874418644427617, -0.07542107921525291, 0.37529897511789073, -0.06171493315160638, -0.2732681313347889, 0.09744930073687035, -0.02452587804518549, -0.16921755128608243, 0.15497529249433883, 0.13630395012385235, 0.15080527152593542, -0.2184377488589323, 0.11681640281525821, -0.04331783669796295, 0.13788113050253653, 0.1468861907629705, -0.06342708533658169, 0.12319115086078145, 0.08494871761649847, -0.0007126042512870143, 0.1491304820321114, 0.029386403087367553, -0.14055275679111662, -0.304955934560517, -0.18126985746458535, -0.15834628008646753, 0.06653214859486581, -0.11647139746758224, -0.1340639045939031, 0.3754360818292764, 0.10297524211814672, 0.15295231461854333, 0.06359183853037836, 0.19172318652272224, 0.2465298640166932, 0.03988369357510947, 0.03567425133774012, 0.1706162674818188, 0.2250261274279981, 0.12454904172365076, -0.2845364750012267, -0.05593042351055618, 0.3424531697500043]
|
707.0788
|
Evolved stars hint to an external origin of enhanced metallicity in
planet-hosting stars
|
Exo-planets are preferentially found around high metallicity main sequence
stars. We aim at investigating whether evolved stars share this property, and
what this tells about planet formation. Statistical tools and the basic
concepts of stellar evolution theory are applied to published results as well
as our own radial velocity and chemical analyses of evolved stars. We show that
the metal distributions of planet-hosting (P-H) dwarfs and giants are
different, and that the latter do not favor metal-rich systems. Rather, these
stars follow the same age-metallicity relation as the giants without planets in
our sample. The straightforward explanation is to attribute the difference
between dwarfs and giants to the much larger masses of giants' convective
envelopes. If the metal excess on the main sequence is due to pollution, the
effects of dilution naturally explains why it is not observed among evolved
stars. Although we cannot exclude other explanations, the lack of any
preference for metal-rich systems among P-H giants could be a strong indication
of the accretion of metal-rich material. We discuss further tests, as well as
some predictions and consequences of this hypothesis.
|
astro-ph
|
exoplanets are preferentially found around high metallicity main sequence stars we aim at investigating whether evolved stars share this property and what this tells about planet formation statistical tools and the basic concepts of stellar evolution theory are applied to published results as well as our own radial velocity and chemical analyses of evolved stars we show that the metal distributions of planethosting ph dwarfs and giants are different and that the latter do not favor metalrich systems rather these stars follow the same agemetallicity relation as the giants without planets in our sample the straightforward explanation is to attribute the difference between dwarfs and giants to the much larger masses of giants convective envelopes if the metal excess on the main sequence is due to pollution the effects of dilution naturally explains why it is not observed among evolved stars although we cannot exclude other explanations the lack of any preference for metalrich systems among ph giants could be a strong indication of the accretion of metalrich material we discuss further tests as well as some predictions and consequences of this hypothesis
|
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|
[-0.03590207614014735, 0.1567508871818933, -0.09186268713497354, 0.16544434177162853, -0.15371860801647214, -0.058437416676695095, 0.10474522540196472, 0.39962140527052764, -0.16949910645211197, -0.35646878802420007, 0.023354917858934798, -0.2875239424832651, -0.09708812095493119, 0.192196231480288, -0.11853934399297704, -0.03729811629012186, 0.10763937563055863, -0.03659028132729556, -0.039553429804863816, -0.28369943438219314, 0.3226832569521123, 0.010962491113510307, 0.1445664411471428, -0.012180355450887557, -0.014892387365841347, -0.1506312907440588, -0.04571578038461587, -0.0175154080599263, -0.13583598548836523, 0.020078663217566867, 0.255259753751528, 0.15598500749784644, 0.24582882281443427, -0.36559944274137274, -0.22943057221583213, 0.08528724775027038, 0.21340592481125065, 0.08032956440302255, -0.0823624692964823, -0.22184752871829044, 0.11562736134826833, -0.1640154496632496, -0.20069194473731128, -0.0010290334365614083, 0.04383249163789594, 0.0432426752029088, -0.21870589066985185, 0.09825964311565495, 0.12533591189750712, 0.13601274713279132, -0.11240622776550362, -0.18840024846039063, -0.09435475869205497, 0.1057905004607797, 0.07756107848304648, 0.002834792381770018, 0.15228188344095225, -0.084103257418104, 0.0032630247568822992, 0.42937902999920363, -0.09506996906945817, -0.0600372589340069, 0.2987016443006249, -0.22447172187663533, -0.16360463656272498, 0.032364259963683056, 0.12437044234399725, 0.1306019473350202, -0.18511721287833768, -0.035262605149751915, -0.017919294613302158, 0.18069985763735452, 0.06582815784444708, 0.07227750168100971, 0.3511926039911645, 0.1233203316034, 0.027133340966310756, 0.03225422204749244, -0.11964019514625365, -0.08531622379687968, -0.21388496255562844, -0.16301378329365473, -0.111879678804025, 0.04595895714033838, -0.10412490095017268, -0.1391405173546999, 0.31328001547349826, 0.1586932431838131, 0.2107786001921024, 0.026090154557175043, 0.3016919010905954, 0.08608274118855859, 0.13582060613628963, 0.09524720342976609, 0.28079750068797654, 0.20731661406321306, 0.09500147308395042, -0.25450809270209307, 0.16078862119668527, -0.028455665927575192]
|
707.0789
|
On the mechanism of the flow of polymers
|
A non-Newtonian flow of a polymer melt is discussed. The description of the
exponential decrease of the apparent viscosity by the well-known Eyring formula
with an activation energy reduction proportional to the shear stress does not
take into account specific features of the polymeric structure. We propose to
modify the description of the macromolecular flow mechanism by including
conformational changes of the polymeric chains. The elasticity of a strained
polymeric chain, having an entropy origin, can be the reason of the reduction
of the activation energy for the transition of a molecular-kinetic unit of the
chain into a new equilibrium state in the flow direction during the thermal
fluctuation. In that case, the activation energy of the transition should
decrease by a value proportional to the reversible high-elastic component of
the shear deformation caused by the flow of the polymer.
|
cond-mat.soft
|
a nonnewtonian flow of a polymer melt is discussed the description of the exponential decrease of the apparent viscosity by the wellknown eyring formula with an activation energy reduction proportional to the shear stress does not take into account specific features of the polymeric structure we propose to modify the description of the macromolecular flow mechanism by including conformational changes of the polymeric chains the elasticity of a strained polymeric chain having an entropy origin can be the reason of the reduction of the activation energy for the transition of a molecularkinetic unit of the chain into a new equilibrium state in the flow direction during the thermal fluctuation in that case the activation energy of the transition should decrease by a value proportional to the reversible highelastic component of the shear deformation caused by the flow of the polymer
|
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|
[-0.12892097970068778, 0.2012884713202236, -0.10096377330972887, -0.02210145125671444, -0.03277770299866474, -0.09920415499334713, 0.012454111884488799, 0.300185005441844, -0.3352821101401028, -0.2507439453503211, 0.07642395324207735, -0.24962585542531912, -0.10590672919111287, 0.12233983615342957, -0.016831816274592345, 0.03180062485081579, 0.018849771020920586, 0.03404052998106793, -0.05730294784457295, -0.14515097494146673, 0.2649130430608559, 0.10622084617159135, 0.3259857986256373, 0.09117507164051636, 0.1101702320114743, -0.002535672541774756, 0.037263943550759834, 0.07214617388818761, -0.19901738802446162, 0.12152952637500171, 0.19455956611380304, 0.012083431156419164, 0.24536171873609314, -0.46408716140301537, -0.27396549398130604, 0.10082757232456113, 0.10440345961439738, 0.11953765860082005, 0.006545350494921851, -0.1916952658856703, 0.05001559361091835, -0.17138759873593026, -0.10870343513063176, -0.05413848896370196, 0.02031747697477343, 0.0436383593247922, -0.20392813219181297, 0.1454993718598547, 0.12820254753866372, 0.030328707136347784, -0.1247047434205846, -0.07534706377149593, -0.07278629813825699, 0.10807984661337712, 0.11334003424171439, -0.000936400785157792, 0.22322548095558992, -0.16602769826049749, -0.05257034968926484, 0.38806216653081316, -0.06900286037565323, -0.16973818608110758, 0.12947271334127985, -0.09305785729703929, -0.09126461443002168, 0.21907991429425697, 0.1475678282009317, 0.06833699861836197, -0.14147747706047345, 0.02231933364122034, 0.025148830230836923, 0.16920237752890363, 0.030699758344872607, -0.050488659028272084, 0.20137152551144039, 0.18332203527202282, 0.050304473962353394, 0.2207962461913058, -0.10434109216100342, -0.12888094807619885, -0.3045814804918729, -0.2259124464476012, -0.18909939479714313, 0.07830538900358446, -0.12312200093950085, -0.20175138282716917, 0.40598524034880906, 0.05737813094788344, 0.22132098026030944, 0.03765748701855647, 0.2334069594549913, 0.12360969142278107, 0.0999941047743338, 0.030933681409125526, 0.2614860057348399, 0.14445698977508348, 0.1370804903646864, -0.30863477222005026, 0.1311004359623511, 0.07482019626776681]
|
707.079
|
Asymmetric Gravitational Lenses in TeVeS and Application to the Bullet
Cluster
|
Aims: We explore the lensing properties of asymmetric matter density
distributions in Bekenstein's Tensor-Vector-Scalar theory (TeVeS). Methods:
Using an iterative Fourier-based solver for the resulting non-linear scalar
field equation, we numerically calculate the total gravitational potential and
derive the corresponding TeVeS lensing maps. Results: Considering variations on
rather small scales, we show that the lensing properties significantly depend
on the lens's extent along the line of sight. Furthermore, all simulated TeVeS
convergence maps strongly track the dominant baryonic components, non-linear
effects, being capable of counteracting this trend, turn out to be very small.
Setting up a toy model for the cluster merger 1E0657-558, we infer that TeVeS
cannot explain observations without assuming an additional dark mass component
in both cluster centers, which is in accordance with previous work.
|
astro-ph
|
aims we explore the lensing properties of asymmetric matter density distributions in bekensteins tensorvectorscalar theory teves methods using an iterative fourierbased solver for the resulting nonlinear scalar field equation we numerically calculate the total gravitational potential and derive the corresponding teves lensing maps results considering variations on rather small scales we show that the lensing properties significantly depend on the lenss extent along the line of sight furthermore all simulated teves convergence maps strongly track the dominant baryonic components nonlinear effects being capable of counteracting this trend turn out to be very small setting up a toy model for the cluster merger 1e0657558 we infer that teves cannot explain observations without assuming an additional dark mass component in both cluster centers which is in accordance with previous work
|
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|
[-0.09797216939032366, 0.07349445414481244, -0.1330884925717878, 0.13727892571771444, -0.11975862562309864, -0.09722811383621176, -0.027605311606664126, 0.35181706242783123, -0.22097866259724652, -0.31229385710501856, 0.029385367828031438, -0.2660968656734701, -0.13001903086944028, 0.18237136981572755, -0.004377628012394258, 0.006718375525155733, 0.04516630518871049, -0.01926563827811863, -0.08836698420923347, -0.26284560370222887, 0.3365562718556544, 0.10133413070913895, 0.24017388582980448, 0.0021413693117887473, 0.09170681831260868, -0.010516263905537221, -0.0836874733632972, 0.05676897259270267, -0.14598285702164124, 0.04505113229993009, 0.16597836643868927, 0.1135806407086378, 0.21206374296579192, -0.40563517965578527, -0.24971380608170762, 0.10780139221600438, 0.1662355984503389, 0.14582668692721848, -0.059891516900469746, -0.28284772872462755, 0.06187822662885915, -0.1885862820384692, -0.16049577121427933, -0.060183646720509194, -0.01319926407805449, 0.037735623096354136, -0.21411993021737466, 0.1343411673510144, 0.01623480376794703, -0.015190529211084972, -0.09945261919538873, -0.09467895826064916, -0.007924450732868656, 0.03614708075169907, 0.062215956100334896, 0.03265800691650126, 0.19094728260723398, -0.15153240849076258, -0.03460298030539741, 0.3909381632657014, -0.12799718955445083, -0.1779042050502328, 0.16456739694176084, -0.1509129920696421, -0.18761766573022545, 0.08920938245475639, 0.1797130914719039, 0.11853187866581157, -0.14959486480802298, 0.08928462496530915, -0.02423517176856164, 0.21816076965038772, 0.06945697100139982, -0.006624597073316054, 0.30916486288485834, 0.07706597292716362, 0.07125099370649307, 0.08545860693006697, -0.1401461408249745, -0.10455404551945223, -0.280913064523434, -0.05024272665135967, -0.11998811841837687, 0.024121886962242316, -0.13411483355216203, -0.14350228888784036, 0.34516190996667906, 0.16592008110439016, 0.19268738091454024, 0.08643482311524076, 0.31490824683822055, 0.12863980160481045, 0.06561493294226915, 0.080788026502457, 0.3159151337607655, 0.19995044733491518, 0.0718625439321911, -0.2652632393080077, 0.026428723144669864, 0.019737571097058496]
|
707.0791
|
Dynamical Mean Field Study of the Two-Dimensional Disordered Hubbard
Model
|
We study the two-dimensional paramagnetic Anderson-Hubbard model using an
extension of dynamical mean-field theory that allows us to treat disorder and
strong electronic correlations on equal footing. We investigate the scaling of
the inverse participation ratio at quarter- and half-filling and find a
nonmonotonic dependence of the localization length on the interaction strength.
We do not find evidence for an insulator-metal transition. The disorder
potential becomes unscreened near the Mott transition. Furthermore, strong
correlations suppress the Altshuler-Aronov density of states anomaly near
half-filling.
|
cond-mat.str-el cond-mat.dis-nn
|
we study the twodimensional paramagnetic andersonhubbard model using an extension of dynamical meanfield theory that allows us to treat disorder and strong electronic correlations on equal footing we investigate the scaling of the inverse participation ratio at quarter and halffilling and find a nonmonotonic dependence of the localization length on the interaction strength we do not find evidence for an insulatormetal transition the disorder potential becomes unscreened near the mott transition furthermore strong correlations suppress the altshuleraronov density of states anomaly near halffilling
|
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|
[-0.17380071807854686, 0.18516791484308856, -0.05961524603358212, 0.14625880686588674, -0.010050810435899052, -0.1699898190675752, 0.09753936614858054, 0.3505379628524723, -0.23656233781051025, -0.23954737523054503, -0.012570670205561152, -0.3862647147856566, -0.18189323553815484, 0.05688245827752917, 0.11905981225791915, -0.02954289911269962, -0.07674587159473674, 0.009446622197886547, -0.15145098195545914, -0.15683424569307322, 0.3177047648175384, 0.03851590390844518, 0.3372806897723531, 0.18451563779444222, -0.0032653477749820933, 0.09263003882334893, 0.11838488558486822, 0.04897524756435529, -0.18980963217665747, -0.01708927074326651, 0.18446966862875452, -0.09644129197253476, 0.24613200117979783, -0.41302257638245105, -0.18105678791068044, 0.05841960015156901, 0.16467313607593617, 0.18208748892129187, -0.02939563133916537, -0.3055978080549513, -0.0038870686261230207, -0.19105441741510687, -0.18425260832482748, -0.10034441582140434, 0.014471295098942447, -0.049287433772493734, -0.2922438502154616, 0.15036200677572065, 0.05361347884347898, 0.11252977362418749, -0.1027809788160172, -0.06733223072152181, -0.021010039884776593, 0.11968243781320122, 0.042278891371798716, 0.025761744358116782, 0.15695644209879528, -0.15381457464186005, -0.0808927885099617, 0.32131730059318875, -0.07042668623350426, -0.06802065147603133, 0.22797389923460243, -0.21482397329219313, -0.08738747324110065, 0.15414166787123107, 0.1523123844807227, 0.04206601703113102, -0.09124573800398643, 0.10139958634313354, -0.01812268314035946, 0.23118576441094818, -0.03073492830798748, 0.0596978136181203, 0.22210045962269048, 0.15399615955819568, 0.08712927461040756, 0.1630126123866403, -0.13843309305361415, -0.13678891235311708, -0.26500815660300026, -0.09236326475392084, -0.2132604832589873, 0.05375332267220687, -0.08758042908658649, -0.2268554507305913, 0.38304692413657904, 0.24186197508979274, 0.18085762664271765, 0.04429648281355579, 0.1874894735302372, 0.18095348682254553, 0.03815754358263978, 0.025030842533402414, 0.2937926407174084, 0.1517731975048713, 0.06772450478579176, -0.35478901038372734, 0.04954445877123669, 0.0698366435833769]
|
707.0792
|
Theory of RF-spectroscopy of strongly interacting Fermions
|
We show that strong pairing correlations in Fermi gases lead to the
appearance of a gap-like structure in the RF-spectrum, both in the balanced
superfluid and in the normal phase above the Clogston-Chandrasekhar limit. The
average RF-shift of a unitary gas is proportional to the ratio of the Fermi
velocity and the scattering length with the final state. In the strongly
imbalanced case, the RF-spectrum measures the binding energy of a minority atom
to the Fermi sea of majority atoms. Our results provide a qualitative
understanding of recent experiments by Schunck et.al.
|
cond-mat.other
|
we show that strong pairing correlations in fermi gases lead to the appearance of a gaplike structure in the rfspectrum both in the balanced superfluid and in the normal phase above the clogstonchandrasekhar limit the average rfshift of a unitary gas is proportional to the ratio of the fermi velocity and the scattering length with the final state in the strongly imbalanced case the rfspectrum measures the binding energy of a minority atom to the fermi sea of majority atoms our results provide a qualitative understanding of recent experiments by schunck etal
|
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|
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|
707.0793
|
The microcanonical ensemble of the ideal relativistic quantum gas with
angular momentum conservation
|
We derive the microcanonical partition function of the ideal relativistic
quantum gas with fixed intrinsic angular momentum as an expansion over fixed
multiplicities. We developed a group theoretical approach by generalizing known
projection techniques to the Poincare' group. Our calculation is carried out in
a quantum field framework and applies to particles with any spin. It extends
known results in literature in that it does not introduce any large volume
approximation and it takes particle spin fully into account. We provide
expressions of the microcanonical partition function at fixed multiplicities in
the limiting classical case of large volumes and large angular momenta and in
the grand-canonical ensemble. We also derive the microcanonical partition
function of the ideal relativistic quantum gas with fixed parity.
|
nucl-th cond-mat.stat-mech
|
we derive the microcanonical partition function of the ideal relativistic quantum gas with fixed intrinsic angular momentum as an expansion over fixed multiplicities we developed a group theoretical approach by generalizing known projection techniques to the poincare group our calculation is carried out in a quantum field framework and applies to particles with any spin it extends known results in literature in that it does not introduce any large volume approximation and it takes particle spin fully into account we provide expressions of the microcanonical partition function at fixed multiplicities in the limiting classical case of large volumes and large angular momenta and in the grandcanonical ensemble we also derive the microcanonical partition function of the ideal relativistic quantum gas with fixed parity
|
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|
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|
707.0794
|
Field-theoretic methods
|
Many complex systems are characterized by intriguing spatio-temporal
structures. Their mathematical description relies on the analysis of
appropriate correlation functions. Functional integral techniques provide a
unifying formalism that facilitates the computation of such correlation
functions and moments, and furthermore allows a systematic development of
perturbation expansions and other useful approximative schemes. It is explained
how nonlinear stochastic processes may be mapped onto exponential probability
distributions, whose weights are determined by continuum field theory actions.
Such mappings are madeexplicit for (1) stochastic interacting particle systems
whose kinetics is defined through a microscopic master equation; and (2)
nonlinear Langevin stochastic differential equations which provide a mesoscopic
description wherein a separation of time scales between the relevant degrees of
freedom and background statistical noise is assumed. Several well-studied
examples are introduced to illustrate the general methodology.
|
cond-mat.stat-mech
|
many complex systems are characterized by intriguing spatiotemporal structures their mathematical description relies on the analysis of appropriate correlation functions functional integral techniques provide a unifying formalism that facilitates the computation of such correlation functions and moments and furthermore allows a systematic development of perturbation expansions and other useful approximative schemes it is explained how nonlinear stochastic processes may be mapped onto exponential probability distributions whose weights are determined by continuum field theory actions such mappings are madeexplicit for 1 stochastic interacting particle systems whose kinetics is defined through a microscopic master equation and 2 nonlinear langevin stochastic differential equations which provide a mesoscopic description wherein a separation of time scales between the relevant degrees of freedom and background statistical noise is assumed several wellstudied examples are introduced to illustrate the general methodology
|
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|
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|
707.0795
|
Stability of a functional equation of Deeba on semigroups
|
Let $S$ be a semigroup and $X$ a Banach space. The functional equation $\phi
(xyz)+ \phi (x) + \phi (y) + \phi (z) = \phi (xy) + \phi (yz) + \phi (xz)$ is
said to be stable for the pair $(X, S)$ if and only if $f: S\to X$ satisfying
$\| f(xyz)+f(x) + f(y) + f(z) - f(xy)- f(yz)-f(xz)\| \leq \delta $ for some
positive real number $\delta$ and all $x, y, z \in S$, there is a solution
$\phi : S \to X$ such that $f-\phi$ is bounded. In this paper, among others, we
prove the following results: 1) this functional equation, in general, is not
stable on an arbitrary semigroup; 2) this equation is stable on periodic
semigroups; 3) this equation is stable on abelian semigroups; 4) any semigroup
with left (or right) law of reduction can be embedded into a semigroup with
left (or right) law of reduction where this equation is stable.
|
math.CA math.FA
|
let s be a semigroup and x a banach space the functional equation phi xyz phi x phi y phi z phi xy phi yz phi xz is said to be stable for the pair x s if and only if f sto x satisfying fxyzfx fy fz fxy fyzfxz leq delta for some positive real number delta and all x y z in s there is a solution phi s to x such that fphi is bounded in this paper among others we prove the following results 1 this functional equation in general is not stable on an arbitrary semigroup 2 this equation is stable on periodic semigroups 3 this equation is stable on abelian semigroups 4 any semigroup with left or right law of reduction can be embedded into a semigroup with left or right law of reduction where this equation is stable
|
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|
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|
707.0796
|
Performance of Linear Field Reconstruction Techniques with Noise and
Uncertain Sensor Locations
|
We consider a wireless sensor network, sampling a bandlimited field,
described by a limited number of harmonics. Sensor nodes are irregularly
deployed over the area of interest or subject to random motion; in addition
sensors measurements are affected by noise. Our goal is to obtain a high
quality reconstruction of the field, with the mean square error (MSE) of the
estimate as performance metric. In particular, we analytically derive the
performance of several reconstruction/estimation techniques based on linear
filtering. For each technique, we obtain the MSE, as well as its asymptotic
expression in the case where the field number of harmonics and the number of
sensors grow to infinity, while their ratio is kept constant. Through numerical
simulations, we show the validity of the asymptotic analysis, even for a small
number of sensors. We provide some novel guidelines for the design of sensor
networks when many parameters, such as field bandwidth, number of sensors,
reconstruction quality, sensor motion characteristics, and noise level of the
measures, have to be traded off.
|
cs.OH
|
we consider a wireless sensor network sampling a bandlimited field described by a limited number of harmonics sensor nodes are irregularly deployed over the area of interest or subject to random motion in addition sensors measurements are affected by noise our goal is to obtain a high quality reconstruction of the field with the mean square error mse of the estimate as performance metric in particular we analytically derive the performance of several reconstructionestimation techniques based on linear filtering for each technique we obtain the mse as well as its asymptotic expression in the case where the field number of harmonics and the number of sensors grow to infinity while their ratio is kept constant through numerical simulations we show the validity of the asymptotic analysis even for a small number of sensors we provide some novel guidelines for the design of sensor networks when many parameters such as field bandwidth number of sensors reconstruction quality sensor motion characteristics and noise level of the measures have to be traded off
|
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|
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|
707.0797
|
Higgs boson plus photon production at the LHC: a clean probe of the
b-quark parton densities
|
Higgs boson production in association with a high pT photon at the CERN Large
Hadron Collider is analyzed, in the framework of the MSSM model, for the
heavier neutral Higgs bosons. The request of an additional photon in the
exclusive Higgs boson final state selects b-quark pairs among the possible
initial partonic states, since gluon-gluon initial states are not allowed by
C-parity conservation. Hence, the measurement of cross sections for neutral
Higgs boson plus photon production can provide a clean probe of the b-quark
density in the proton as well as of the b-quark Yukawa coupling. The
suppression of the production rates by the b-quark electromagnetic coupling can
be compensated by the enhanced Higgs boson Yukawa coupling to b's in the large
tan(beta) regime. The Higgs boson decay into a tau-lepton pair is considered,
and irreducible backgrounds with corresponding signal significances are
evaluated.
|
hep-ph
|
higgs boson production in association with a high pt photon at the cern large hadron collider is analyzed in the framework of the mssm model for the heavier neutral higgs bosons the request of an additional photon in the exclusive higgs boson final state selects bquark pairs among the possible initial partonic states since gluongluon initial states are not allowed by cparity conservation hence the measurement of cross sections for neutral higgs boson plus photon production can provide a clean probe of the bquark density in the proton as well as of the bquark yukawa coupling the suppression of the production rates by the bquark electromagnetic coupling can be compensated by the enhanced higgs boson yukawa coupling to bs in the large tanbeta regime the higgs boson decay into a taulepton pair is considered and irreducible backgrounds with corresponding signal significances are evaluated
|
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|
[-0.10058437715043554, 0.32190449733844345, -0.033883236729624594, 0.18052178624385667, -0.0367672640905175, -0.21882785050242398, 0.04717903312009115, 0.30113205838609824, -0.1801381334467055, -0.25049839203955826, -0.05975225286874138, -0.2997713596104169, 0.11677872909272051, 0.09649745322653203, 0.11060128660572992, 0.12559005416200295, 0.13334960839222673, 0.016241972574229855, 0.004290308630325135, -0.2593730206510143, 0.31915884078773377, 0.051100549704909744, 0.21711886097950586, 0.1376557326875627, 0.08086848291535895, 0.0784189271597335, -0.03624051426585367, -0.14613263672901564, -0.04411850518048774, 0.054645558189880754, 0.22584367057933777, 0.0415273065763441, 0.11287033644836995, -0.27239355367406476, -0.054672373012213, 0.15537014815604666, 0.19648114491540652, 0.10655022569007233, -0.07834002572938904, -0.35590092420832, 0.10655840552392436, -0.27390066859266765, -0.06117223383910902, -0.04245421751255782, -0.0646817777370969, -0.09961110611374561, -0.39819666371075113, 0.08985839804660503, -0.1268453877590193, 0.000856918051604416, 0.031177521619776435, -0.1757135083898902, -0.1598790331590608, -0.016690772796909396, 0.19643763929094232, 0.039868670924390844, 0.23176851659570333, -0.2565195472989153, -0.2214465434988635, 0.39184829403183885, -0.11215913715166645, -0.20836762884970417, 0.15463187308148382, -0.1977498767558824, -0.114425764590098, 0.2067909516863056, 0.2511400377957502, 0.03449149236369591, -0.21288204170320627, 0.1967814282373317, -0.006938287368780198, 0.145973809276727, 0.059307137611680306, 0.12137959168090687, 0.26600181132268447, 0.1889416252985805, 0.005331464475501081, 0.06615428832258664, -0.08560831872811475, -0.0607572384410655, -0.48126331633087116, -0.16315720089665658, -0.0654772672463547, 0.061114764063382176, -0.0663193834461581, -0.08494484173850371, 0.3679910807681459, 0.044648414366989284, 0.2966639833407594, -0.044647483803963585, 0.3254317572727878, 0.12603192294986879, 0.09592526217770334, 0.011246783514258816, 0.3970570221983533, 0.19209541850462816, 0.14279475911696266, -0.23116922410940946, 0.018781188663772562, 0.09792505401525307]
|
707.0798
|
Hall effect between parallel quantum wires
|
We study theoretically the parallel quantum wires of the experiment by
Auslaender et al. [Science 308, 88 (2005)] at low electron density. It is shown
that a Hall effect as observed in two- or three-dimensional electron systems
develops as one of the two wires enters the spin-incoherent regime of small
spin bandwidth. This together with magnetic field dependent tunneling exponents
clearly identifies spin-incoherence in such experiments and it serves to
distinguish it from disorder effects.
|
cond-mat.mes-hall cond-mat.str-el
|
we study theoretically the parallel quantum wires of the experiment by auslaender et al science 308 88 2005 at low electron density it is shown that a hall effect as observed in two or threedimensional electron systems develops as one of the two wires enters the spinincoherent regime of small spin bandwidth this together with magnetic field dependent tunneling exponents clearly identifies spinincoherence in such experiments and it serves to distinguish it from disorder effects
|
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|
[-0.15548868254424902, 0.22284462804138358, -0.048486616871495906, 0.052230240338217666, -0.002373589973619862, -0.1779240181329786, 0.041909150102779874, 0.33051200849916534, -0.2400004740149991, -0.36190213760159706, 0.010538462426739972, -0.3165178206824773, -0.1687246318497519, 0.20725164996976084, 0.015088596828030171, 0.027035448209357424, -0.012449624646152999, -0.06496645122565128, -0.03405932365677546, -0.22293689383848295, 0.2607609937219201, 0.07979975760178137, 0.33606915690659267, 0.06393632262542441, 0.08782064169016038, 0.03744093337524179, 0.02785795954735698, 0.07928681244910066, -0.14743855043451656, -0.033762873666411314, 0.27137133237477895, -0.030329581022866675, 0.2316311057531149, -0.41480450843133637, -0.20106450198658718, -0.017927553756414232, 0.1122204745219819, 0.15092450626056036, -0.03143766598234809, -0.2721885668013144, 0.020451906690927776, -0.16857631228285264, -0.11013828548351051, -0.04442959594716494, 0.04436774075666845, -0.023916971507935307, -0.2516585201578769, 0.10346336445355839, 0.054650537378620356, 0.05627622631554668, -0.015581737387283528, -0.081291403130603, -0.013706561284945221, 0.057272479248805776, 0.024078938597183977, 0.07029416140584224, 0.16485520601398437, -0.09503519942518324, -0.1393207346366064, 0.3274041986269121, -0.057484449592192434, -0.1085465952905046, 0.22355535379107538, -0.18735036498243995, -0.09163834413236661, 0.12140643677195988, 0.09146343093566797, 0.05051908825014441, -0.098712668470988, 0.08187973189342301, -0.04434974351425882, 0.13874516772055948, 0.0404662621353841, 0.04916735843604279, 0.2394216622704187, 0.1788233390606537, 0.013075684751006397, 0.13276849054051815, -0.1697819606004585, -0.06694902183743259, -0.22956564446055405, -0.16680560332748132, -0.24280384766894417, 0.0677470439554167, 0.003939540736020128, -0.1511025950576122, 0.38021005127528634, 0.1694470165121193, 0.20244693075231202, -0.07347072167573748, 0.26437425044541424, 0.1094618435615573, 0.05247765352848817, 0.06095151846750161, 0.2673803708371329, 0.16376324412350013, 0.13669267569265858, -0.27372121570845814, 0.028224995907245053, -0.01848563745403914]
|
707.0799
|
A New Family of Unitary Space-Time Codes with a Fast Parallel Sphere
Decoder Algorithm
|
In this paper we propose a new design criterion and a new class of unitary
signal constellations for differential space-time modulation for
multiple-antenna systems over Rayleigh flat-fading channels with unknown fading
coefficients. Extensive simulations show that the new codes have significantly
better performance than existing codes. We have compared the performance of our
codes with differential detection schemes using orthogonal design, Cayley
differential codes, fixed-point-free group codes and product of groups and for
the same bit error rate, our codes allow smaller signal to noise ratio by as
much as 10 dB. The design of the new codes is accomplished in a systematic way
through the optimization of a performance index that closely describes the bit
error rate as a function of the signal to noise ratio. The new performance
index is computationally simple and we have derived analytical expressions for
its gradient with respect to constellation parameters. Decoding of the proposed
constellations is reduced to a set of one-dimensional closest point problems
that we solve using parallel sphere decoder algorithms. This decoding strategy
can also improve efficiency of existing codes.
|
cs.IT math.IT
|
in this paper we propose a new design criterion and a new class of unitary signal constellations for differential spacetime modulation for multipleantenna systems over rayleigh flatfading channels with unknown fading coefficients extensive simulations show that the new codes have significantly better performance than existing codes we have compared the performance of our codes with differential detection schemes using orthogonal design cayley differential codes fixedpointfree group codes and product of groups and for the same bit error rate our codes allow smaller signal to noise ratio by as much as 10 db the design of the new codes is accomplished in a systematic way through the optimization of a performance index that closely describes the bit error rate as a function of the signal to noise ratio the new performance index is computationally simple and we have derived analytical expressions for its gradient with respect to constellation parameters decoding of the proposed constellations is reduced to a set of onedimensional closest point problems that we solve using parallel sphere decoder algorithms this decoding strategy can also improve efficiency of existing codes
|
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|
[-0.17875237938129854, 0.00012117850167151973, -0.07059801584526122, 0.058055325728347165, -0.03287682393102685, -0.210778900934126, 0.07715559538610753, 0.4103852024929629, -0.2842592194300783, -0.2881097953335012, 0.11646173920904322, -0.21436298945249774, -0.1893745026723559, 0.25004909753552457, -0.14216087230877406, 0.11504145266548653, 0.08330731036640622, 0.031203938848133203, -0.15443546175365003, -0.3156103185630141, 0.29006681177579896, 0.1855374407280463, 0.2939291220243238, -0.056096768670442686, 0.09888681557632627, -0.016409093087014243, -0.024477593135088682, -0.03464603907742553, -0.1485424212575874, 0.09323388209967817, 0.2734913181678202, 0.16173361599939304, 0.1992058188253139, -0.3344246904000393, -0.24854536189309204, 0.08390487594663767, 0.17449386578403125, 0.12123550941848624, -0.07861412875868833, -0.23675920161320854, 0.13940508825478057, -0.21433381763549306, -0.011279063919322431, -0.02307886167208134, -0.024603441270140324, 0.03883002395548688, -0.3278721207958641, 0.03361995142575184, 0.025136395198040905, 0.061249861473124986, -0.007818338713989443, -0.18826437835679363, 0.08270828106224495, 0.11982175733351268, 0.0013657144414909307, 0.03074476203639369, 0.08817377750303863, -0.07162387040443718, -0.17345267936628497, 0.36643180574254436, -0.07246770955230179, -0.26840270105852276, 0.13816082362697887, -0.07721449702576791, -0.06752817323225556, 0.19957240391908554, 0.2626236304975223, 0.09831251467974311, -0.12788412870211496, 0.035934994008793436, -0.02477552552414204, 0.1973689609002682, 0.057541832882262646, 0.09114809289255607, 0.12712669086730036, 0.14943243423476815, 0.09472722416481219, 0.17818881830107935, -0.10247331314324015, -0.07096322785255124, -0.24012692671948374, -0.14379469411658607, -0.15591509291228134, -0.0132075738038312, -0.1309334158595749, -0.12488811979075451, 0.38871707639641523, 0.1528513961193764, 0.12722723847332293, 0.13740295076675876, 0.34627450166980206, 0.09886295584974956, 0.0861589056584413, 0.13473831328373012, 0.19573260407035564, 0.169881789278733, 0.024217747613010692, -0.1934906486318915, 0.04050442207223885, 0.05954848407659659]
|
707.08
|
Resolving the bow-shock nebula around the old pulsar PSR B1929+10 with
multi-epoch Chandra observations
|
We have studied the nearby old pulsar PSR B1929+10 and its surrounding
interstellar medium utilizing the sub-arcsecond angular resolution of the
Chandra X-ray Observatory. The Chandra data are found to be fully consistent
with the results obtained from deep XMM-Newton observations as far as the
pulsar is concerned. We confirm the non-thermal emission nature of the pulsar's
X-radiation. In addition to the X-ray trail already seen in previous
observations by the ROSAT and XMM-Newton X-ray observatories, we discovered an
arc-like nebula surrounding the pulsar. We interpret the feature as a bow-shock
nebula and discuss its energetics in the context of standard shock theory.
|
astro-ph
|
we have studied the nearby old pulsar psr b192910 and its surrounding interstellar medium utilizing the subarcsecond angular resolution of the chandra xray observatory the chandra data are found to be fully consistent with the results obtained from deep xmmnewton observations as far as the pulsar is concerned we confirm the nonthermal emission nature of the pulsars xradiation in addition to the xray trail already seen in previous observations by the rosat and xmmnewton xray observatories we discovered an arclike nebula surrounding the pulsar we interpret the feature as a bowshock nebula and discuss its energetics in the context of standard shock theory
|
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|
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|
707.0801
|
In-Medium Properties of Jets
|
Modifications of jet-like azimuthal correlations have revealed novel
properties of the medium created in relativistic heavy-ion collisions.
Experimental results on jet-like 2- and 3-particle correlations, specificly
"punch-through" at high transverse momentum, broadening at low and modest
transverse momentum, and particularly the possible experimental evidence for
conical flow, are reviewed. Future prospects of jet-like correlations and their
physics potential are discussed.
|
nucl-ex
|
modifications of jetlike azimuthal correlations have revealed novel properties of the medium created in relativistic heavyion collisions experimental results on jetlike 2 and 3particle correlations specificly punchthrough at high transverse momentum broadening at low and modest transverse momentum and particularly the possible experimental evidence for conical flow are reviewed future prospects of jetlike correlations and their physics potential are discussed
|
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|
[-0.14553514976938398, 0.2516902594006289, -0.10987158687943119, 0.18492178109048282, -0.017987786512032658, -0.11051515759742361, -0.16059882272729428, 0.4606990298982394, -0.2220214222699909, -0.30288083315432324, -0.03825539858198835, -0.3446783232976193, 0.03983738783241834, 0.17541091921502502, 0.11330304463725474, 0.12168322973963568, 0.1239138182442067, -0.08021489505545568, -0.07348481597382796, -0.10957819997664478, 0.3188253169153201, 0.15783540020554754, 0.2632612873942165, 0.24324857685083556, 0.06410643663573062, 0.03472084558363688, -0.10401869805182441, 0.0716452683969322, -0.10963119582176382, 0.010612715655736531, 0.22033972372853403, 0.0015751008117981886, 0.18587618009818685, -0.4309395922947738, -0.16832870402831143, 0.010038536689165285, 0.18272532527413915, 0.10195665838102162, -0.16044083047634528, -0.2856091900168271, 0.021789079254307644, -0.20609167175588466, -0.1905000168293462, -0.12493564899600411, 0.04505282664134846, 0.05543293364314457, -0.2109084085924393, 0.19356620807390093, 0.039065989286844, 0.12862046766963045, -0.03084279611012188, -0.175036415394585, -0.08564798909602529, 0.003370655791328873, 0.0728434531996816, 0.07833699651567613, 0.1520129413959586, -0.19130516578088183, -0.16733083686933425, 0.3667972042083235, 0.05168229224697008, -0.11151187096611928, 0.20338499239819535, -0.28031400708734233, -0.1640802195485113, 0.17388233648991938, 0.2678276273753431, 0.03776305812505721, -0.1065230672642336, -0.06308045662827079, 0.011831648379438004, 0.06890660775351827, 0.042932500873329275, 0.18686274975790815, 0.2668685886724773, 0.13028612134630901, -0.08885047636468406, 0.10722966404173966, -0.18318815232098934, -0.08050610554518998, -0.3789531222970809, -0.06558355412019765, -0.12008298787493575, -0.002480336717503556, -0.09952340005814114, -0.023465761086130042, 0.4011527782432356, 0.09277743023772866, 0.23986965717779377, -0.10080120422072329, 0.2760474677434412, 0.026391922409441007, 0.03367604471159057, 0.12148613395895493, 0.33315732652100466, 0.17384911038107792, 0.23410597586436038, -0.2426524049744515, 0.057059888759533224, -0.05669212160174245]
|
707.0802
|
Very fast watermarking by reversible contrast mapping
|
Reversible contrast mapping (RCM) is a simple integer transform that applies
to pairs of pixels. For some pairs of pixels, RCM is invertible, even if the
least significant bits (LSBs) of the transformed pixels are lost. The data
space occupied by the LSBs is suitable for data hiding. The embedded
information bit-rates of the proposed spatial domain reversible watermarking
scheme are close to the highest bit-rates reported so far. The scheme does not
need additional data compression, and, in terms of mathematical complexity, it
appears to be the lowest complexity one proposed up to now. A very fast lookup
table implementation is proposed. Robustness against cropping can be ensured as
well.
|
cs.MM cs.CR cs.CV cs.IT math.IT
|
reversible contrast mapping rcm is a simple integer transform that applies to pairs of pixels for some pairs of pixels rcm is invertible even if the least significant bits lsbs of the transformed pixels are lost the data space occupied by the lsbs is suitable for data hiding the embedded information bitrates of the proposed spatial domain reversible watermarking scheme are close to the highest bitrates reported so far the scheme does not need additional data compression and in terms of mathematical complexity it appears to be the lowest complexity one proposed up to now a very fast lookup table implementation is proposed robustness against cropping can be ensured as well
|
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|
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|
707.0803
|
Representation theory, Radon transform and the heat equation on a
Riemannian symmetric space
|
Let X=G/K be a Riemannian symmetric space of the noncompact type. We give a
short exposition of the representation theory related to X, and discuss its
holomorphic extension to the complex crown, a G-invariant subdomain in the
complexified symmetric space X_\C=G_\C/K_\C. Applications to the heat transform
and the Radon transform for X are given.
|
math.RT
|
let xgk be a riemannian symmetric space of the noncompact type we give a short exposition of the representation theory related to x and discuss its holomorphic extension to the complex crown a ginvariant subdomain in the complexified symmetric space x_cg_ck_c applications to the heat transform and the radon transform for x are given
|
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|
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|
707.0804
|
Post-hatching parental care behaviour and hormonal status in a precocial
bird
|
In birds, the link between parental care behaviour and prolactin release
during incubation persists after hatching in altricial birds, but has never
been precisely studied during the whole rearing period in precocial species,
such as ducks. The present study aims to understand how changes in parental
care after hatching are related to circulating prolactin levels in mallard hens
rearing ducklings. Blood was sampled in hens over at least 13 post-hatching
weeks and the behaviour of the hens and the ducklings was recorded daily until
fledging. Contacts between hens and the ducklings, leadership of the ducklings
and gathering of them steadily decreased over post-hatching time. Conversely,
resting, preening and agonistic behaviour of hens towards ducklings increased.
Plasma prolactin concentrations remained at high levels after hatching and then
fell after week 6 when body mass and structural size of the young were close to
those of the hen. Parental care behaviour declined linearly with brood age,
showed a disruption of the hen-brood bond at week 6 post-hatching and was
related to prolactin concentration according to a sigmoid function. Our results
suggest that a definite threshold in circulating prolactin is necessary to
promote and/or to maintain post-hatching parental care in ducks.
|
q-bio.PE
|
in birds the link between parental care behaviour and prolactin release during incubation persists after hatching in altricial birds but has never been precisely studied during the whole rearing period in precocial species such as ducks the present study aims to understand how changes in parental care after hatching are related to circulating prolactin levels in mallard hens rearing ducklings blood was sampled in hens over at least 13 posthatching weeks and the behaviour of the hens and the ducklings was recorded daily until fledging contacts between hens and the ducklings leadership of the ducklings and gathering of them steadily decreased over posthatching time conversely resting preening and agonistic behaviour of hens towards ducklings increased plasma prolactin concentrations remained at high levels after hatching and then fell after week 6 when body mass and structural size of the young were close to those of the hen parental care behaviour declined linearly with brood age showed a disruption of the henbrood bond at week 6 posthatching and was related to prolactin concentration according to a sigmoid function our results suggest that a definite threshold in circulating prolactin is necessary to promote andor to maintain posthatching parental care in ducks
|
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|
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|
707.0805
|
A New Generalization of Chebyshev Inequality for Random Vectors
|
In this article, we derive a new generalization of Chebyshev inequality for
random vectors. We demonstrate that the new generalization is much less
conservative than the classical generalization.
|
math.ST cs.LG math.PR stat.AP stat.TH
|
in this article we derive a new generalization of chebyshev inequality for random vectors we demonstrate that the new generalization is much less conservative than the classical generalization
|
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|
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|
707.0806
|
Holomorphic geometric models for representations of $C^*$-algebras
|
Representations of $C^*$-algebras are realized on section spaces of
holomorphic homogeneous vector bundles. The corresponding section spaces are
investigated by means of a new notion of reproducing kernel, suitable for
dealing with involutive diffeomorphisms defined on the base spaces of the
bundles. Applications of this technique to dilation theory of completely
positive maps are explored and the critical role of complexified homogeneous
spaces in connection with the Stinespring dilations is pointed out. The general
results are further illustrated by a discussion of several specific topics,
including similarity orbits of representations of amenable Banach algebras,
similarity orbits of conditional expectations, geometric models of
representations of Cuntz algebras, the relationship to endomorphisms of
${\mathcal B}({\mathcal H})$, and non-commutative stochastic analysis.
|
math.OA math.DG
|
representations of calgebras are realized on section spaces of holomorphic homogeneous vector bundles the corresponding section spaces are investigated by means of a new notion of reproducing kernel suitable for dealing with involutive diffeomorphisms defined on the base spaces of the bundles applications of this technique to dilation theory of completely positive maps are explored and the critical role of complexified homogeneous spaces in connection with the stinespring dilations is pointed out the general results are further illustrated by a discussion of several specific topics including similarity orbits of representations of amenable banach algebras similarity orbits of conditional expectations geometric models of representations of cuntz algebras the relationship to endomorphisms of mathcal bmathcal h and noncommutative stochastic analysis
|
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|
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707.0807
|
Can dc voltage proportional to the persistent current be observed on
segment of asymmetric mesoscopic ring?
|
In order to clear up a question on possibility of a dc voltage proportional
to the persistent current in normal metal and semiconductor mesoscopic loops
conjectural causes of this phenomenon observed in superconductor loops is
investigated.
|
cond-mat.supr-con cond-mat.mes-hall
|
in order to clear up a question on possibility of a dc voltage proportional to the persistent current in normal metal and semiconductor mesoscopic loops conjectural causes of this phenomenon observed in superconductor loops is investigated
|
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|
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|
707.0808
|
The Cyborg Astrobiologist: Porting from a wearable computer to the
Astrobiology Phone-cam
|
We have used a simple camera phone to significantly improve an `exploration
system' for astrobiology and geology. This camera phone will make it much
easier to develop and test computer-vision algorithms for future planetary
exploration. We envision that the `Astrobiology Phone-cam' exploration system
can be fruitfully used in other problem domains as well.
|
cs.CV astro-ph cs.AI cs.CE cs.HC cs.NI cs.RO cs.SE
|
we have used a simple camera phone to significantly improve an exploration system for astrobiology and geology this camera phone will make it much easier to develop and test computervision algorithms for future planetary exploration we envision that the astrobiology phonecam exploration system can be fruitfully used in other problem domains as well
|
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|
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|
707.0809
|
Microsolvation of cationic dimers in $^4$He droplets: geometries of
A$_2^+$(He)$_N$ (A=Li,Na,K) from optimized energies
|
Ab initio computed interaction forces are employed in order to describe the
microsolvation of the A$_2^+(^2\Sigma)$ (A=Li,Na,K) molecular ion in $^4$He
clusters of small variable size. The minimum energy structures are obtained by
performing energy minimization based on a genetic algorithm approach. The
symmetry features of the collocation of solvent adatoms around the dimeric
cation are analyzed in detail, showing that the selective growth of small
clusters around the two sides of the ion during the solvation process is a
feature common to all three dopants.
|
physics.chem-ph
|
ab initio computed interaction forces are employed in order to describe the microsolvation of the a_22sigma alinak molecular ion in 4he clusters of small variable size the minimum energy structures are obtained by performing energy minimization based on a genetic algorithm approach the symmetry features of the collocation of solvent adatoms around the dimeric cation are analyzed in detail showing that the selective growth of small clusters around the two sides of the ion during the solvation process is a feature common to all three dopants
|
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|
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|
707.081
|
The MSST Campaign: II.Effective temperature and gravity variations in
the multi-periodic pulsating subdwarf B star PG1605+072
|
Stellar oscillations are an important tool to probe the interior of a star.
Subdwarf B stars are core helium burning objects, but their formation is poorly
understood as neither single star nor binary evolution can fully explain their
observed properties. Since 1997 an increasing number of sdB stars has been
found to pulsate forming two classes of stars (the V361 Hya and V1093 Her
stars). We focus on the bright V 361 Hya star PG1605+072 to characterize its
frequency spectrum. While most previous studies relied on light variations, we
have measured radial velocity variations for as much as 20 modes. In this paper
we aim at characterizing the modes from atmospheric parameter and radial
velocity variations. Time resolved spectroscopy ($\approx$9000 spectra) has
been carried out to detect line profile variations from which variations of the
effective temperature and gravity are extracted by means of a quantitative
spectral analysis. We measured variations of effective temperatures and
gravities for eight modes with semi-amplitudes ranging from $\Delta
T_{\rm{eff}}=880$ K to as small as 88 K and $\Delta\log{g}$ of 0.08 dex to as
low as 0.008 dex. Gravity and temperature vary almost in phase, whereas phase
lags are found between temperature and radial velocity. This profound analysis
of a unique data set serves as sound basis for the next step towards an
identification of pulsation modes. As rotation may play an important role the
modelling of pulsation modes is challenging but feasible.
|
astro-ph
|
stellar oscillations are an important tool to probe the interior of a star subdwarf b stars are core helium burning objects but their formation is poorly understood as neither single star nor binary evolution can fully explain their observed properties since 1997 an increasing number of sdb stars has been found to pulsate forming two classes of stars the v361 hya and v1093 her stars we focus on the bright v 361 hya star pg1605072 to characterize its frequency spectrum while most previous studies relied on light variations we have measured radial velocity variations for as much as 20 modes in this paper we aim at characterizing the modes from atmospheric parameter and radial velocity variations time resolved spectroscopy approx9000 spectra has been carried out to detect line profile variations from which variations of the effective temperature and gravity are extracted by means of a quantitative spectral analysis we measured variations of effective temperatures and gravities for eight modes with semiamplitudes ranging from delta t_rmeff880 k to as small as 88 k and deltalogg of 008 dex to as low as 0008 dex gravity and temperature vary almost in phase whereas phase lags are found between temperature and radial velocity this profound analysis of a unique data set serves as sound basis for the next step towards an identification of pulsation modes as rotation may play an important role the modelling of pulsation modes is challenging but feasible
|
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|
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|
707.0811
|
Hadron multiplicities at the LHC
|
We present the predictions for hadron multiplicities in pp, pA and AA
collisions at the LHC based on our approach to the Color Glass Condensate.
|
hep-ph
|
we present the predictions for hadron multiplicities in pp pa and aa collisions at the lhc based on our approach to the color glass condensate
|
[['we', 'present', 'the', 'predictions', 'for', 'hadron', 'multiplicities', 'in', 'pp', 'pa', 'and', 'aa', 'collisions', 'at', 'the', 'lhc', 'based', 'on', 'our', 'approach', 'to', 'the', 'color', 'glass', 'condensate']]
|
[0.05159370839595795, 0.17547216538339852, -0.24553384134545922, 0.08786568826064467, 0.06517650887370109, -0.09313823794946074, -0.06943997618742287, 0.42790774065069853, -0.1301560142636299, -0.19961126670241355, -0.061020678733475504, -0.3391918687522411, 0.07478049384430051, 0.0625907968962565, 0.056387087628245354, 0.11651163604110479, 0.1535835148394108, -0.012993792667984963, 0.004282914455980062, -0.2710588579438627, 0.29019435465335847, 0.0656854945793748, 0.24952126506716013, 0.2385881255567074, 0.07561101585626602, 0.17379142170771955, 0.00979737363755703, -0.009722476452589035, -0.18011961687356234, 0.1206633737415541, 0.29771121181547644, 0.03443099344614893, 0.08271053358912468, -0.3612813091278076, -0.046215485893189905, 0.10188995316624641, 0.08995732575654984, 0.15821328617632388, -0.038718871348537506, -0.22798215165734292, 0.16840617634356023, -0.222122964784503, -0.11785238388925791, -0.010243077874183654, 0.02225025348365307, -0.014551015794277191, -0.3532521154358983, 0.08439620954915882, -0.011606973027810455, 0.1674902145192027, -0.00028908276930451394, -0.24811282297596335, -0.04999198936857283, -0.09653701120987535, -0.0058245138078927994, 0.08204865081235767, 0.18620262125506998, -0.213979590353556, -0.19760905681177973, 0.4086292529851198, -0.03608655657619238, -0.05206670183688402, 0.2534082191903144, -0.21800503559410572, -0.12570731073617936, 0.12266483783721924, 0.31070903565734626, 0.07157031029462814, -0.15792947683483363, 0.000462445595767349, -0.03218799889087677, 0.1746778617799282, 0.06666494265198708, 0.0657465365761891, 0.1986955323815346, 0.2533075924217701, -0.08271859560161829, 0.097595503218472, -0.16307658231817185, -0.06890363797545433, -0.46437842786312106, -0.05819021297618747, -0.12021349504590034, -0.043183643477968874, -0.05852842874766793, -0.025893668383359908, 0.35979427106678485, 0.20102476969361305, 0.3474551159888506, 0.021588788740336894, 0.2948305409774184, 0.04148850845638662, 0.05182882575201802, 0.07444160144776106, 0.3046893613040447, 0.1285909891873598, 0.28890496203675864, -0.28144273489713667, -0.016485939770936965, 0.16706215787678957]
|
707.0812
|
Comment on ``New Physics Contributions to the Lifetime Difference in
$D^0-\bar D^{0}$ mixing''
|
We find that in the nonmanifest left-right (LR) model, an important LR mixing
effect was not considered in the paper by E. Golowich, S. Pakvasa, and A.
Petrov, Phys. Rev. Lett. 98, 181801 (2007).
|
hep-ph
|
we find that in the nonmanifest leftright lr model an important lr mixing effect was not considered in the paper by e golowich s pakvasa and a petrov phys rev lett 98 181801 2007
|
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|
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|
707.0813
|
Large Deviations Principle for Self-Intersection Local Times for random
walk in dimension d>4
|
We obtain a large deviations principle for the self-intersection local times
for a symmetric random walk in dimension d>4. As an application, we obtain
moderate deviations for random walk in random sceneries in some region of
parameters.
|
math.PR
|
we obtain a large deviations principle for the selfintersection local times for a symmetric random walk in dimension d4 as an application we obtain moderate deviations for random walk in random sceneries in some region of parameters
|
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|
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|
707.0814
|
A diffraction-compensating 0-25 ns free space terahertz delay line for
coherent quantum control
|
Free space delay lines provide pulses of variable time spacing for optical
experiments such as pump-probe spectroscopy and coherent quantum control,
including spin and photon echo techniques. However, in the terahertz (THz)
region of the spectrum, beam divergence due to diffraction limits the useful
length of traditional free space delay lines. We present a novel double-folded
variable delay line for light in the frequency range 0.24-1.2 THz, which
incorporates a symmetric arrangement of lenses whose spacing can be adjusted to
compensate for diffraction at each delay. Scalable for use in other wavelength
regimes, the design relays an input Gaussian beam waist to the output with up
to 25 ns (~8 m) total delay and is enclosed in a desiccated volume of <0.5 m^3.
The delay line can deliver two or three pulses with relative amplitudes
controlled via variable spacing silicon etalon beam splitters. Beam profiles of
a 0.24 THz beam show good agreement with calculations at long delays, with
insertion loss per delay stage of~3 dB.
|
physics.optics
|
free space delay lines provide pulses of variable time spacing for optical experiments such as pumpprobe spectroscopy and coherent quantum control including spin and photon echo techniques however in the terahertz thz region of the spectrum beam divergence due to diffraction limits the useful length of traditional free space delay lines we present a novel doublefolded variable delay line for light in the frequency range 02412 thz which incorporates a symmetric arrangement of lenses whose spacing can be adjusted to compensate for diffraction at each delay scalable for use in other wavelength regimes the design relays an input gaussian beam waist to the output with up to 25 ns 8 m total delay and is enclosed in a desiccated volume of 05 m3 the delay line can deliver two or three pulses with relative amplitudes controlled via variable spacing silicon etalon beam splitters beam profiles of a 024 thz beam show good agreement with calculations at long delays with insertion loss per delay stage of3 db
|
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|
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|
707.0815
|
Forward- and Mid-Rapidity Jet-like correlations
|
Mid-rapidity azimuthal correlations probe di-jets originating mainly from
gluon-gluon hard-scattering. Measurements of such correlations have revealed
significant (gluon-)jet modification in central Au+Au collisions. Azimuthal
correlations of hadrons at forward rapidity with a mid-rapidity high-$\pt$
hadron, on the other hand, probe asymmetric partonic scatterings involving
large-x quarks and small-x gluons. We present preliminary results from STAR on
correlations of charged hadrons at forward rapidity in the forward TPCs
($2.7<|\eta|<3.9$, $\pt<2$ GeV/$c$) with high-$\pt$ charged hadrons at
mid-rapidity from the main TPC ($|\eta|<1$, $\pt>3$ GeV/$c$) in $pp$, d+Au, and
Au+Au collisions at $\snn=200$ GeV. The implications of the results for small-x
gluon distributions (Color Glass Condensate formation) and the energy loss of
quark jets at forward rapidity in nuclear medium are discussed. %Their
measurements in d+Au collisions, separately at the d-side and the Au-side, may
be sensitive to Color Glass Condensate in the Au-nucleus. Their measurements in
Au+Au collisions may probe quark-jet modification in nuclear medium.
|
nucl-ex
|
midrapidity azimuthal correlations probe dijets originating mainly from gluongluon hardscattering measurements of such correlations have revealed significant gluonjet modification in central auau collisions azimuthal correlations of hadrons at forward rapidity with a midrapidity highpt hadron on the other hand probe asymmetric partonic scatterings involving largex quarks and smallx gluons we present preliminary results from star on correlations of charged hadrons at forward rapidity in the forward tpcs 27eta39 pt2 gevc with highpt charged hadrons at midrapidity from the main tpc eta1 pt3 gevc in pp dau and auau collisions at snn200 gev the implications of the results for smallx gluon distributions color glass condensate formation and the energy loss of quark jets at forward rapidity in nuclear medium are discussed their measurements in dau collisions separately at the dside and the auside may be sensitive to color glass condensate in the aunucleus their measurements in auau collisions may probe quarkjet modification in nuclear medium
|
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|
[-0.014552502566948533, 0.331523972141246, -0.27778274294920263, 0.19558964045718313, 0.05951166129981478, -0.10080541939474642, -0.14495409567529957, 0.3851189389374728, -0.15687688551843165, -0.20945501880099376, -0.16446428056495885, -0.430512212831527, 0.24281803146004677, 0.06740010650983701, 0.08649940199451521, 0.13584723933289447, 0.1513652626343537, -0.06856262266946335, -0.03996544620022178, -0.15460631623708954, 0.3239268496135871, 0.0955255079207321, 0.1805065105172495, 0.29961583570266764, 0.051107758406239254, 0.14907478713120023, -0.08517152961033087, -0.03002804399157564, -0.1186357284989208, -0.04545006861211732, 0.35590572123842623, -0.044802188952453435, 0.0890018422640666, -0.36923575998594366, -0.07148652750843515, 0.10642796407453715, 0.19978411989596984, 0.08905857420681665, -0.14275346209450315, -0.27788863794878127, 0.07208565981437763, -0.26087934733678897, -0.14066663599262635, -0.02377645797872295, -0.03489237501906852, 0.05355755243916065, -0.31985548089568816, 0.19888071714589994, -0.03370033418604483, 0.07289232501294464, 0.041450285526613395, -0.23096071833123763, -0.10006561414183428, -0.06395777582967033, 0.11204229793821772, 0.19146798790432512, 0.2623064943806579, -0.22711695612835078, -0.1895077313979467, 0.36648250434547663, 0.07216260270526012, -0.11128809088841081, 0.18492866398611416, -0.34149713347976407, -0.1637861607844631, 0.18155739206199845, 0.3503209440410137, 0.08701844503016522, -0.2527597735930855, -0.011880048154853284, -0.02845222069726636, 0.15146630613754192, 0.166498945519949, 0.1665470171137713, 0.18142040093429387, 0.19661147970706225, -0.06346301356175293, 0.06791479353133278, -0.15374811271360764, -0.10916231575111549, -0.43921051791869103, -0.028931707761560878, -0.053708579220498605, 0.03027184198377654, -0.15424146062190022, 0.03619693181167046, 0.33691605988889933, 0.040292451834927, 0.31300410827466596, -0.10667487072447936, 0.3369568295466403, 0.004466086046304554, 0.06520265632309019, 0.14445251648003857, 0.31676568324367205, 0.21276510259136558, 0.3433683633245528, -0.2842192637811725, 0.0663153713538001, 0.07138566477689892]
|
707.0816
|
Carbon-Enhanced Hyper-metal-poor Stars and the Stellar IMF at Low
Metallicity
|
The two known ``hyper-metal-poor'' (HMP) stars, HE0107-5240 and HE1327-2326,
have extremely high enhancements of the light elements C, N, and O relative to
Fe and appear to represent a statistically significant excess population
relative to the halo metallicity distribution extrapolated from [Fe/H] > -3.
This study weighs the available evidence for and against three hypothetical
origins for these stars: (1) that they formed from gas enriched by a primordial
``faint supernova'', (2) that they formed from gas enriched by core-collapse
supernovae and C-rich gas ejected in rotation-driven winds from massive stars,
and (3) that they formed as the low-mass secondaries in binary systems at Z ~
10^{-5.5} Zsun and acquired their light-element enhancements from an
intermediate-mass companion as it passed through an AGB phase. The observations
interpreted here, especially the depletion of lithium seen in HE1327-2326,
favor the binary mass-transfer hypothesis. If HE0107-5240 and HE1327-2326
formed in binary systems, the statistically significant absence of isolated
and/or C-normal stars at similar [Fe/H] implies that low-mass stars could form
at that metallicity, but that masses M ~< 1.4 Msun were disfavored in the IMF.
This result is also explained if the abundance-derived top-heavy IMF for
primordial stars persists to [Fe/H] ~ -5.5. This finding indicates that
low-mass star formation was possible at extremely low metallicity, and that the
typical stellar mass may have had a complex dependence on metallicity rather
than a sharp transition driven solely by gas cooling.
|
astro-ph
|
the two known hypermetalpoor hmp stars he01075240 and he13272326 have extremely high enhancements of the light elements c n and o relative to fe and appear to represent a statistically significant excess population relative to the halo metallicity distribution extrapolated from feh 3 this study weighs the available evidence for and against three hypothetical origins for these stars 1 that they formed from gas enriched by a primordial faint supernova 2 that they formed from gas enriched by corecollapse supernovae and crich gas ejected in rotationdriven winds from massive stars and 3 that they formed as the lowmass secondaries in binary systems at z 1055 zsun and acquired their lightelement enhancements from an intermediatemass companion as it passed through an agb phase the observations interpreted here especially the depletion of lithium seen in he13272326 favor the binary masstransfer hypothesis if he01075240 and he13272326 formed in binary systems the statistically significant absence of isolated andor cnormal stars at similar feh implies that lowmass stars could form at that metallicity but that masses m 14 msun were disfavored in the imf this result is also explained if the abundancederived topheavy imf for primordial stars persists to feh 55 this finding indicates that lowmass star formation was possible at extremely low metallicity and that the typical stellar mass may have had a complex dependence on metallicity rather than a sharp transition driven solely by gas cooling
|
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|
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|
707.0817
|
Viscosity and jet quenching from holographic model
|
We consider the backreaction of the fundamental flavor degrees of freedom on
the AdS$_5$-Schwarz background, and calculate their contributions to the shear
viscosity and jet-quenching parameter of the thermal quark-gluon plasma.
|
hep-ph
|
we consider the backreaction of the fundamental flavor degrees of freedom on the ads_5schwarz background and calculate their contributions to the shear viscosity and jetquenching parameter of the thermal quarkgluon plasma
|
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|
[-0.17113597139250486, 0.2734721110823254, -0.10515144194165865, 0.023358022033547362, -0.05888489217807849, 0.006223343623181184, 0.00760291691403836, 0.23152491624156635, -0.2581580881650249, -0.24827016840378444, 0.026199983386322855, -0.2858114180465539, 0.018166862614452838, 0.0697159289692839, 0.0415306040396293, 0.03632489529748758, -0.019718300221332658, 0.013753145436445872, -0.02718997594929533, -0.20580914480766901, 0.3622758218087256, 0.08848837142189343, 0.26097514318923154, 0.16716752505550783, 0.11403577728196979, 0.006165267604713639, -0.12872757882190247, 0.04391568433493376, -0.23719190911845847, 0.03356337376559774, 0.14084757349143426, 0.03430789958219975, 0.12299703853204846, -0.40877076458806794, -0.2625497955208023, 0.06237866319715977, 0.09991259189943473, 0.14546516115466754, 0.04839444704897081, -0.19406345564251146, -0.02473698400426656, -0.17662195252875487, -0.16372156037638586, -0.10375301300082355, -0.013274633201460044, -0.05133433490991592, -0.26287232351799805, 0.1624232727723817, -0.004127965774387121, -0.018089858163148165, -0.014541117319216331, -0.16795915321757396, -0.07408927982517828, 0.1022742125360916, 0.19790818729670717, 0.027854919852688908, 0.2378281684126705, -0.31245988346636294, -0.052866754680871965, 0.4533842117836078, -0.04794456735253334, -0.212783869728446, 0.19551030481234194, -0.19701691636194785, -0.11368916576417784, 0.11280358526855708, 0.2681722408781449, 0.11577960238889015, -0.1494350821400682, 0.10474274511992311, 0.03729987901945909, 0.12101158030175914, 0.05966634502013524, 0.10308561582739155, 0.2749339220424493, 0.11593538261950016, -0.007495333782086769, 0.16928723271315296, -0.07743148824665695, -0.046025499639411764, -0.38448138429472845, -0.10521160632682343, -0.10438795449833076, 0.06798897025485834, -0.19151054605123743, -0.20510049626852075, 0.4573382750153542, 0.17606030584235366, 0.1420044963209269, -0.03967261087770264, 0.3126068517565727, 0.0859828741910557, -0.03729230153840035, 0.08756257090717554, 0.36612268139918647, 0.2536194979523619, 0.12712858308417102, -0.42303818725049497, -0.043429993418976666, 0.10253441197176774]
|
707.0818
|
The number of open paths in an oriented $\rho$-percolation model
|
We study the asymptotic properties of the number of open paths of length $n$
in an oriented $\rho$-percolation model. We show that this number is
$e^{n\alpha(\rho)(1+o(1))}$ as $n \to \infty$. The exponent $\alpha$ is
deterministic, it can be expressed in terms of the free energy of a polymer
model, and it can be explicitely computed in some range of the parameters.
Moreover, in a restricted range of the parameters, we even show that the number
of such paths is $n^{-1/2} W e^{n\alpha(\rho)}(1+o(1))$ for some nondegenerate
random variable $W$. We build on connections with the model of directed
polymers in random environment, and we use techniques and results developed in
this context.
|
math.PR
|
we study the asymptotic properties of the number of open paths of length n in an oriented rhopercolation model we show that this number is enalpharho1o1 as n to infty the exponent alpha is deterministic it can be expressed in terms of the free energy of a polymer model and it can be explicitely computed in some range of the parameters moreover in a restricted range of the parameters we even show that the number of such paths is n12 w enalpharho1o1 for some nondegenerate random variable w we build on connections with the model of directed polymers in random environment and we use techniques and results developed in this context
|
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|
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|
707.0819
|
Asteroseismology of delta Scuti stars in open clusters: Praesepe
|
The present paper provides a general overview of the asteroseismic potential
of delta Scuti stars in clusters, in particular focusing on convection
diagnostics. We give a summarise of the last results obtained by the authors
for the Praesepe cluster of which five delta Scuti stars are analysed. In that
work, linear analysis is confronted with observations, using refined
descriptions for the effects of rotation on the determination of the global
stellar parameters and on the adiabatic oscillation frequency computations. A
single, complete, and coherent solution for all the selected stars is found,
which lead the authors to find important restrictions to the convection
description for a certain range of effective temperatures. Furthermore, the
method used allowed to give an estimate of the global parameters of the
selected stars and constrain the cluster.
|
astro-ph
|
the present paper provides a general overview of the asteroseismic potential of delta scuti stars in clusters in particular focusing on convection diagnostics we give a summarise of the last results obtained by the authors for the praesepe cluster of which five delta scuti stars are analysed in that work linear analysis is confronted with observations using refined descriptions for the effects of rotation on the determination of the global stellar parameters and on the adiabatic oscillation frequency computations a single complete and coherent solution for all the selected stars is found which lead the authors to find important restrictions to the convection description for a certain range of effective temperatures furthermore the method used allowed to give an estimate of the global parameters of the selected stars and constrain the cluster
|
[['the', 'present', 'paper', 'provides', 'a', 'general', 'overview', 'of', 'the', 'asteroseismic', 'potential', 'of', 'delta', 'scuti', 'stars', 'in', 'clusters', 'in', 'particular', 'focusing', 'on', 'convection', 'diagnostics', 'we', 'give', 'a', 'summarise', 'of', 'the', 'last', 'results', 'obtained', 'by', 'the', 'authors', 'for', 'the', 'praesepe', 'cluster', 'of', 'which', 'five', 'delta', 'scuti', 'stars', 'are', 'analysed', 'in', 'that', 'work', 'linear', 'analysis', 'is', 'confronted', 'with', 'observations', 'using', 'refined', 'descriptions', 'for', 'the', 'effects', 'of', 'rotation', 'on', 'the', 'determination', 'of', 'the', 'global', 'stellar', 'parameters', 'and', 'on', 'the', 'adiabatic', 'oscillation', 'frequency', 'computations', 'a', 'single', 'complete', 'and', 'coherent', 'solution', 'for', 'all', 'the', 'selected', 'stars', 'is', 'found', 'which', 'lead', 'the', 'authors', 'to', 'find', 'important', 'restrictions', 'to', 'the', 'convection', 'description', 'for', 'a', 'certain', 'range', 'of', 'effective', 'temperatures', 'furthermore', 'the', 'method', 'used', 'allowed', 'to', 'give', 'an', 'estimate', 'of', 'the', 'global', 'parameters', 'of', 'the', 'selected', 'stars', 'and', 'constrain', 'the', 'cluster']]
|
[-0.0769126235690871, 0.10505776868696116, -0.07605341045806806, 0.07299191136597515, -0.09835910268134973, -0.05397690443858279, 0.09679528684478789, 0.31171198687375046, -0.17144342437104293, -0.33761336747556925, 0.08807821343670542, -0.2442367634044565, -0.06783011843049969, 0.25765850827464776, -0.03452389027260131, 0.018604690470083646, 0.12535138841309218, 0.042869275528849386, -0.07198562042233816, -0.258092177806027, 0.3296013675915839, 0.030074562242423945, 0.1764039525296539, -0.01133904875446619, 0.0447468216862586, -0.044153285551477565, -0.1104003035138841, -0.00961308398594459, -0.23478838701047414, 0.09882090863230229, 0.22493070236117946, 0.1253230203098307, 0.22156394910857533, -0.3846412871992498, -0.21830888476688415, 0.04541097308868881, 0.17185424326651794, 0.09893062422016749, -0.05014064401356419, -0.256328112629214, 0.06757485326957205, -0.13541279915212232, -0.16111545661944104, -0.06942063773925783, 0.04393551995004104, 0.05941382783930749, -0.2863287145543533, 0.06555212184210893, 0.033748713262012286, 0.10550801147650363, -0.12268373536327007, -0.14937343661034846, -0.015104634050547964, 0.12993682300051054, 0.034605363763065805, 0.044437686060766944, 0.07600817573962337, -0.12430525181998471, -0.04207831217244155, 0.40479930289879895, -0.07475391981389487, -0.11663445303477629, 0.16379143265569865, -0.1479744200143173, -0.17964688683048624, 0.042859401878421056, 0.1621525899055555, 0.1473352960169767, -0.1759967022481953, 0.040623590108942044, -0.015640554201760977, 0.16560678458931347, 0.05707612711668127, 0.04259180680321262, 0.2253301011567766, 0.16806572273013776, 0.047290220807278245, 0.10182451621354134, -0.15666653824331606, -0.05189340941565619, -0.30164561877873813, -0.08956409575749245, -0.10375136967526156, 0.014504289170762411, -0.1094914442383566, -0.17017375585750083, 0.44942630052030313, 0.12932076682266075, 0.18326245045120065, 0.015214580201162871, 0.26201842962340877, 0.1298294588605958, 0.06292401525107297, 0.07053901198863362, 0.3044489365579052, 0.19721957098579768, 0.09271542267401167, -0.2622282986571504, 0.045443557520312344, 0.04012809469802023]
|
707.082
|
Magnetic-order induced phonon splitting in MnO from far-infrared
spectroscopy
|
Detailed far-infrared spectra of the optical phonons are reported for
antiferromagnetic MnO. Eigenfrequencies, phonon damping and effective plasma
frequencies are studied as a function of temperature. Special attention is paid
to the phonon splitting at the antiferromagnetic phase transition. The results
are compared to recent experimental and theoretical studies of the spin-phonon
coupling in frustrated magnets, which are explained in terms of a spin-driven
Jahn-Teller effect, and to ab initio and model calculations, which predict
phonon splitting induced by magnetic order.
|
cond-mat.str-el
|
detailed farinfrared spectra of the optical phonons are reported for antiferromagnetic mno eigenfrequencies phonon damping and effective plasma frequencies are studied as a function of temperature special attention is paid to the phonon splitting at the antiferromagnetic phase transition the results are compared to recent experimental and theoretical studies of the spinphonon coupling in frustrated magnets which are explained in terms of a spindriven jahnteller effect and to ab initio and model calculations which predict phonon splitting induced by magnetic order
|
[['detailed', 'farinfrared', 'spectra', 'of', 'the', 'optical', 'phonons', 'are', 'reported', 'for', 'antiferromagnetic', 'mno', 'eigenfrequencies', 'phonon', 'damping', 'and', 'effective', 'plasma', 'frequencies', 'are', 'studied', 'as', 'a', 'function', 'of', 'temperature', 'special', 'attention', 'is', 'paid', 'to', 'the', 'phonon', 'splitting', 'at', 'the', 'antiferromagnetic', 'phase', 'transition', 'the', 'results', 'are', 'compared', 'to', 'recent', 'experimental', 'and', 'theoretical', 'studies', 'of', 'the', 'spinphonon', 'coupling', 'in', 'frustrated', 'magnets', 'which', 'are', 'explained', 'in', 'terms', 'of', 'a', 'spindriven', 'jahnteller', 'effect', 'and', 'to', 'ab', 'initio', 'and', 'model', 'calculations', 'which', 'predict', 'phonon', 'splitting', 'induced', 'by', 'magnetic', 'order']]
|
[-0.15728753501905796, 0.21570002896147839, 0.002523597048158631, 0.05511754573133119, -0.10945455490806956, -0.1118858278165629, 0.06819785715161282, 0.4635955866104291, -0.21666558396163177, -0.25820639324776923, -0.014472054489342105, -0.35739840953725815, -0.11490883817321357, 0.1818063279648346, 0.11640816124409069, 0.02348792712767551, -0.00603598072251052, -0.031270332944889866, -0.06356263328573586, -0.15240468551910677, 0.21944216495943197, 0.07830837412728686, 0.2973811762338435, 0.11020626358825851, -0.013339744892293288, -0.02657202875563576, 0.08918287193425643, 0.012056320399781804, -0.18445321879932444, 0.06629671359342741, 0.3057317538416864, -0.1653794470720315, 0.19002881809425207, -0.41623603449099594, -0.2454158524396243, -0.018042008326400395, 0.12727530870118098, 0.18221731710155714, -0.03561585324092044, -0.24980753455541016, 0.01791975348268026, -0.16114374908998055, -0.07455826595132412, -0.14790500241711182, -0.028947853144074297, 0.009008649230739216, -0.30533087791668045, 0.1122942984339143, 0.05142599816813513, 0.14268183211692145, -0.12079858463717463, -0.16928000594230574, -0.09628963024918864, 0.03974608758487451, 0.09422044912036968, 0.0649695047982221, 0.14094260405105205, -0.04588752233043865, -0.14130872267838798, 0.44034427836721324, -0.047019263552674266, -0.0480873712832913, 0.13925295036838012, -0.18352216615537068, -0.07641797820910995, 0.18635296769422927, 0.1182245589033873, 0.07170249540703716, -0.12664774706426227, 0.05643612044909394, 0.05001759705030256, 0.12905613700341848, 0.018913600524818455, 0.125234943613364, 0.21850824476806102, 0.17156759883495576, -0.06871835364281763, 0.13805030549108913, -0.07690932129848932, -0.09247698156554023, -0.20095123799034842, -0.062209211427856376, -0.24554576905858186, 0.0239229607683273, -0.04769996874089019, -0.15938859434516664, 0.4089764001330844, 0.12839781848733878, 0.14492630879797133, -0.06038219530859755, 0.2732428745826545, 0.13255321814960305, 0.0656421928965475, -0.008632214624940612, 0.34787898339377143, 0.21922611005397308, 0.08667714200499985, -0.3738249290654045, 0.04264362054204361, 0.02070557536057162]
|
707.0821
|
Analysis of radial fundamental-to-first overtone period ratios in the
presence of near degeneracy
|
In the present work we provide the preliminary results obtained when
analysing the rotational Petersen diagrams when including the effects of near
degeneracy. We found that near degeneracy affects significantly the
fundamental-to-first overtone period ratios, showing wriggles in the Petersen
diagrams. Analysis of such wriggles reveals that they are mainly caused by the
avoided-crossing phenomenon. The size of wriggles seems to increase with the
rotational velocity and could, in certain cases, invalidate any accurate mass
and/or metallicity determinations. Nevertheless, deep analysis of near
degeneracy effects may allow us to obtain additional information on the mode
identification of the radial modes and their corresponding coupled pairs, which
would allow us to constrain the modelling.
|
astro-ph
|
in the present work we provide the preliminary results obtained when analysing the rotational petersen diagrams when including the effects of near degeneracy we found that near degeneracy affects significantly the fundamentaltofirst overtone period ratios showing wriggles in the petersen diagrams analysis of such wriggles reveals that they are mainly caused by the avoidedcrossing phenomenon the size of wriggles seems to increase with the rotational velocity and could in certain cases invalidate any accurate mass andor metallicity determinations nevertheless deep analysis of near degeneracy effects may allow us to obtain additional information on the mode identification of the radial modes and their corresponding coupled pairs which would allow us to constrain the modelling
|
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|
[-0.1266299606483829, 0.12781838951195823, -0.10138633913759675, 0.07821607716946996, -0.09080693219272819, -0.10286917864245229, 0.09734405611483712, 0.33339948597131297, -0.20526042351100063, -0.3671786969061941, 0.0906996297344449, -0.26492183001911535, -0.09864827339021888, 0.19306490689216713, -0.06079768142080866, -0.02312181701251705, 0.11061992477854281, -0.01684837054277263, -0.08188473381388965, -0.19349526909666434, 0.29977029170134173, 0.04494303688677194, 0.2460274216220049, 0.07621904892481066, -0.017534420093787566, -0.014615724628259028, -0.10263523878659596, 0.0036812550836365127, -0.18545308843918715, 0.08536797560684915, 0.20500232350812958, 0.084538102951618, 0.18091548892802425, -0.3657667703726994, -0.18590829556342214, 0.11535285975384925, 0.2303176856990571, 0.15316212481099814, 0.01704127813198803, -0.2604310885092543, 0.017068443248977667, -0.10152263480787431, -0.222724382204303, -0.08616601208840231, -0.0017644423268003656, 0.0073744653283418825, -0.24843464464148773, 0.10955126018961892, 0.06770358793437481, 0.0623958597591679, -0.06737506173002268, -0.14371181580853382, -0.10516715655103326, 0.12898374803158472, 0.067124578966676, -0.014694353853493729, 0.0948316778480408, -0.11267670006574397, -0.05994975695752406, 0.37757766048889607, -0.07507082549688805, -0.12950566652619142, 0.1999563603146401, -0.19392852274800784, -0.18532919111644983, 0.13693817057979427, 0.14615564658223384, 0.06709013360419444, -0.07426255697464512, 0.0050752413839550824, 0.026478351979416663, 0.18334503736696206, 0.0885915829858277, 0.0727343141500439, 0.27136376741275725, 0.0713206446588239, 0.017902930230775382, 0.10829176369380937, -0.1542613784321085, -0.07905445334992171, -0.24327293281177326, -0.09665324497044432, -0.08774341657070701, 0.02569375437659411, -0.10408095850159173, -0.13138134640342156, 0.3675313064346223, 0.15675705435257573, 0.19659580285899989, 0.006696613504443251, 0.24962570462542186, 0.12487260650336143, 0.11854312266392039, 0.05956070579122752, 0.328154427631359, 0.15466704249722948, 0.07837533667251202, -0.3001801266800612, 0.08796721330976912, 0.011456579969879905]
|
707.0822
|
The mapping-torus of a free group automorphism is hyperbolic relative to
the canonical subgroups of polynomial growth
|
We prove that the mapping torus group $\FN \rtimes_{\alpha} \Z$ of any
automorphism $\alpha$ of a free group $\FN$ of finite rank $n \geq 2$ is weakly
hyperbolic relative to the canonical (up to conjugation) family $\mathcal
H(\alpha)$ of subgroups of $\FN$ which consists of (and contains
representatives of all) conjugacy classes that grow polynomially under
iteration of $\alpha$. Furthermore, we show that $\FN \rtimes_{\alpha} \Z$ is
strongly hyperbolic relative to the mapping torus of the family $\mathcal
H(\alpha)$. As an application, we use a result of Drutu-Sapir to deduce that
$\FN \rtimes_{\alpha} \Z$ has Rapic Decay.
|
math.GR math.GT
|
we prove that the mapping torus group fn rtimes_alpha z of any automorphism alpha of a free group fn of finite rank n geq 2 is weakly hyperbolic relative to the canonical up to conjugation family mathcal halpha of subgroups of fn which consists of and contains representatives of all conjugacy classes that grow polynomially under iteration of alpha furthermore we show that fn rtimes_alpha z is strongly hyperbolic relative to the mapping torus of the family mathcal halpha as an application we use a result of drutusapir to deduce that fn rtimes_alpha z has rapic decay
|
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|
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|
707.0823
|
A Statistical Theory for the Analysis of Uncertain Systems
|
This paper addresses the issues of conservativeness and computational
complexity of probabilistic robustness analysis. We solve both issues by
defining a new sampling strategy and robustness measure. The new measure is
shown to be much less conservative than the existing one. The new sampling
strategy enables the definition of efficient hierarchical sample reuse
algorithms that reduce significantly the computational complexity and make it
independent of the dimension of the uncertainty space. Moreover, we show that
there exists a one to one correspondence between the new and the existing
robustness measures and provide a computationally simple algorithm to derive
one from the other.
|
stat.AP math.DS
|
this paper addresses the issues of conservativeness and computational complexity of probabilistic robustness analysis we solve both issues by defining a new sampling strategy and robustness measure the new measure is shown to be much less conservative than the existing one the new sampling strategy enables the definition of efficient hierarchical sample reuse algorithms that reduce significantly the computational complexity and make it independent of the dimension of the uncertainty space moreover we show that there exists a one to one correspondence between the new and the existing robustness measures and provide a computationally simple algorithm to derive one from the other
|
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|
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|
707.0824
|
Properties of new unflavored mesons below 2.4 GeV
|
The global features of spectrum of highly excited light nonstrange mesons can
be well understood within both chiral symmetry restoration scenario combined
with the relation $M^2\sim J+n$ and within nonrelativistic description based on
the relation $M^2\sim L+n$. The predictions of these two alternative
classifications for missing states are different and only future experiments
can distinguish between the two. We elaborate and compare systematically the
predictions of both schemes, which may serve as a suggestion for future
experiments devoted to the search for missing states.
|
hep-ph
|
the global features of spectrum of highly excited light nonstrange mesons can be well understood within both chiral symmetry restoration scenario combined with the relation m2sim jn and within nonrelativistic description based on the relation m2sim ln the predictions of these two alternative classifications for missing states are different and only future experiments can distinguish between the two we elaborate and compare systematically the predictions of both schemes which may serve as a suggestion for future experiments devoted to the search for missing states
|
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|
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|
707.0825
|
Construction of Lagrangian local symmetries for general quadratic theory
|
We propose a procedure which allows one to construct local symmetry
generators of general quadratic Lagrangian theory. Manifest recurrence
relations for generators in terms of so-called structure matrices of the Dirac
formalism are obtained. The procedure fulfilled in terms of initial variables
of the theory, and do not implies either separation of constraints on first and
second class subsets or any other choice of basis for constraints.
|
hep-th math-ph math.MP
|
we propose a procedure which allows one to construct local symmetry generators of general quadratic lagrangian theory manifest recurrence relations for generators in terms of socalled structure matrices of the dirac formalism are obtained the procedure fulfilled in terms of initial variables of the theory and do not implies either separation of constraints on first and second class subsets or any other choice of basis for constraints
|
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|
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|
707.0826
|
Selection of dominant multi-exciton transitions in disordered linear
J-aggregates
|
We show that the third-order optical response of disordered linear
J-aggregates can be calculated by considering only a limited number of
transitions between (multi-) exciton states. We calculate the pump-probe
absorption spectrum resulting from the truncated set of transitions and show
that, apart from the blue wing of the induced absorption peak, it agrees well
with the exact spectrum.
|
cond-mat.dis-nn cond-mat.mtrl-sci
|
we show that the thirdorder optical response of disordered linear jaggregates can be calculated by considering only a limited number of transitions between multi exciton states we calculate the pumpprobe absorption spectrum resulting from the truncated set of transitions and show that apart from the blue wing of the induced absorption peak it agrees well with the exact spectrum
|
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|
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|
707.0827
|
Fundamental Differences Between Application of Basic Principles of
Quantum Mechanics on Atomic and Higher Levels
|
Superconductivity is macroscopic quantum phenomenon. From force of habit most
physicists pay no heed to a paradoxicality of this fact. Niels Bohr considered
quantum mechanics as atomic physics and the paradoxical quantum principles may
be admissible on this level. But they seem quite strange on the macroscopic
level. In the last years some experts, A. J. Leggett and other, attract our
attention to a contradiction between quantum mechanics and macroscopic realism.
In this paper I try to draw reader's attention to some paradoxical consequences
of the Bohr quantization on the macroscopic level.
|
cond-mat.supr-con cond-mat.mes-hall
|
superconductivity is macroscopic quantum phenomenon from force of habit most physicists pay no heed to a paradoxicality of this fact niels bohr considered quantum mechanics as atomic physics and the paradoxical quantum principles may be admissible on this level but they seem quite strange on the macroscopic level in the last years some experts a j leggett and other attract our attention to a contradiction between quantum mechanics and macroscopic realism in this paper i try to draw readers attention to some paradoxical consequences of the bohr quantization on the macroscopic level
|
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|
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|
707.0828
|
Probabilistic Robustness Analysis -- Risks, Complexity and Algorithms
|
It is becoming increasingly apparent that probabilistic approaches can
overcome conservatism and computational complexity of the classical worst-case
deterministic framework and may lead to designs that are actually safer. In
this paper we argue that a comprehensive probabilistic robustness analysis
requires a detailed evaluation of the robustness function and we show that such
evaluation can be performed with essentially any desired accuracy and
confidence using algorithms with complexity linear in the dimension of the
uncertainty space. Moreover, we show that the average memory requirements of
such algorithms are absolutely bounded and well within the capabilities of
today's computers.
In addition to efficiency, our approach permits control over statistical
sampling error and the error due to discretization of the uncertainty radius.
For a specific level of tolerance of the discretization error, our techniques
provide an efficiency improvement upon conventional methods which is inversely
proportional to the accuracy level; i.e., our algorithms get better as the
demands for accuracy increase.
|
stat.AP math.ST stat.TH
|
it is becoming increasingly apparent that probabilistic approaches can overcome conservatism and computational complexity of the classical worstcase deterministic framework and may lead to designs that are actually safer in this paper we argue that a comprehensive probabilistic robustness analysis requires a detailed evaluation of the robustness function and we show that such evaluation can be performed with essentially any desired accuracy and confidence using algorithms with complexity linear in the dimension of the uncertainty space moreover we show that the average memory requirements of such algorithms are absolutely bounded and well within the capabilities of todays computers in addition to efficiency our approach permits control over statistical sampling error and the error due to discretization of the uncertainty radius for a specific level of tolerance of the discretization error our techniques provide an efficiency improvement upon conventional methods which is inversely proportional to the accuracy level ie our algorithms get better as the demands for accuracy increase
|
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|
707.0829
|
Mesures limites pour l'equation de Helmholtz dans le cas non captif
|
Cet article est consacre a l'etude des mesures limites associees a la
solution de l'equation de Helmholtz avec un terme source se concentrant en un
point. Le potentiel est suppose regulier et l'operateur non-captif. La solution
de l'equation de Schrodinger semi-classique s'ecrit alors micro-localement
comme somme finie de distributions lagrangiennes.
Sous une hypothese geometrique, qui generalise l'hypothese du viriel, on en
deduit que la mesure limite existe et qu'elle verifie des proprietes standard.
Enfin, on donne un exemple d'operateur qui ne verifie pas l'hypothese
geometrique et pour lequel la mesure limite n'est pas unique. Le cas de deux
termes sources est aussi traite.
|
math.AP math.FA
|
cet article est consacre a letude des mesures limites associees a la solution de lequation de helmholtz avec un terme source se concentrant en un point le potentiel est suppose regulier et loperateur noncaptif la solution de lequation de schrodinger semiclassique secrit alors microlocalement comme somme finie de distributions lagrangiennes sous une hypothese geometrique qui generalise lhypothese du viriel on en deduit que la mesure limite existe et quelle verifie des proprietes standard enfin on donne un exemple doperateur qui ne verifie pas lhypothese geometrique et pour lequel la mesure limite nest pas unique le cas de deux termes sources est aussi traite
|
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|
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