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706.3914
|
Asymptotic behavior of the entropy of chains placed on stripes
|
By using the transfer matrix approach, we investigate the asymptotic behavior
of the entropy of flexible chains with $M$ monomers each placed on stripes. In
the limit of high density of monomers, we study the behavior of the entropy as
a function of the density of monomers and the width of the stripe, inspired by
recent analytical studies of this problem for the particular case of dimers
(M=2). We obtain the entropy in the asymptotic regime of high densities for
chains with $M=2,..,9$ monomers, as well as for the special case of polymers,
where $M\to\infty$, and find that the results show a regular behavior similar
to the one found analytically for dimers. We also verify that in the
low-density limit the mean-field expression for the entropy is followed by the
results from our transfer matrix calculations.
|
cond-mat.stat-mech
|
by using the transfer matrix approach we investigate the asymptotic behavior of the entropy of flexible chains with m monomers each placed on stripes in the limit of high density of monomers we study the behavior of the entropy as a function of the density of monomers and the width of the stripe inspired by recent analytical studies of this problem for the particular case of dimers m2 we obtain the entropy in the asymptotic regime of high densities for chains with m29 monomers as well as for the special case of polymers where mtoinfty and find that the results show a regular behavior similar to the one found analytically for dimers we also verify that in the lowdensity limit the meanfield expression for the entropy is followed by the results from our transfer matrix calculations
|
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|
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|
706.3915
|
Do unbounded bubbles ultimately become fenced inside a black hole?
|
We examine the dynamical behavior of recently introduced bubbles in
asymptotically flat, five-dimensional spacetimes. Using numerical methods, we
find that even bubbles that initially start expanding eventually collapse to a
Schwarzschild-Tangherlini black hole.
|
hep-th gr-qc
|
we examine the dynamical behavior of recently introduced bubbles in asymptotically flat fivedimensional spacetimes using numerical methods we find that even bubbles that initially start expanding eventually collapse to a schwarzschildtangherlini black hole
|
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|
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|
706.3916
|
Effects of solute concentrations on kinetic pathways in Ni-Al-Cr alloys
|
The kinetic pathways resulting from the formation of coherent L12-ordered
y'-precipitates in the g-matrix (f.c.c.) of Ni-7.5 Al-8.5 Cr at.% and Ni-5.2
Al-14.2 Cr at.% alloys, aged at 873 K, are investigated by atom-probe
tomography (APT) over a range of aging times from 1/6 to 1024 hours; these
alloys have approximately the same volume fraction of the y'-precipitate phase.
Quantification of the phase decomposition within the framework of classical
nucleation theory reveals that the y-matrix solid-solution solute
supersaturations of both alloys provide the chemical driving force, which acts
as the primary determinant of the nucleation behavior. In the coarsening
regime, the temporal evolution of the y'-precipitate average radii and the
y-matrix supersaturations follow the predictions of classical coarsening
models, while the temporal evolution of the y'-precipitate number densities of
both alloys do not. APT results are compared to equilibrium calculations of the
pertinent solvus lines determined by employing both Thermo-Calc and
Grand-Canonical Monte Carlo simulation.
|
cond-mat.mtrl-sci
|
the kinetic pathways resulting from the formation of coherent l12ordered yprecipitates in the gmatrix fcc of ni75 al85 cr at and ni52 al142 cr at alloys aged at 873 k are investigated by atomprobe tomography apt over a range of aging times from 16 to 1024 hours these alloys have approximately the same volume fraction of the yprecipitate phase quantification of the phase decomposition within the framework of classical nucleation theory reveals that the ymatrix solidsolution solute supersaturations of both alloys provide the chemical driving force which acts as the primary determinant of the nucleation behavior in the coarsening regime the temporal evolution of the yprecipitate average radii and the ymatrix supersaturations follow the predictions of classical coarsening models while the temporal evolution of the yprecipitate number densities of both alloys do not apt results are compared to equilibrium calculations of the pertinent solvus lines determined by employing both thermocalc and grandcanonical monte carlo simulation
|
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|
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|
706.3917
|
Holomorphic curves in Exploded Torus Fibrations: Compactness
|
The category of exploded torus fibrations is an extension of the category of
smooth manifolds in which some adiabatic limits look smooth. (For example, the
limits considered in tropical geometry appear smooth, also degenerations
corresponding to an algebraic family with normal crossing singularities are
smooth.) In this paper we prove a compactness theorem for (pseudo)-holomorphic
curves in exploded torus fibrations. In the case of smooth manifolds, this is
just a version of Gromov's compactness theorem in a topology strong enough for
gluing analysis.
|
math.SG math.AP
|
the category of exploded torus fibrations is an extension of the category of smooth manifolds in which some adiabatic limits look smooth for example the limits considered in tropical geometry appear smooth also degenerations corresponding to an algebraic family with normal crossing singularities are smooth in this paper we prove a compactness theorem for pseudoholomorphic curves in exploded torus fibrations in the case of smooth manifolds this is just a version of gromovs compactness theorem in a topology strong enough for gluing analysis
|
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|
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|
706.3918
|
A Linearization of Connes' Embedding Problem
|
We show that Connes' embedding problem for II_1-factors is equivalent to a
statement about distributions of sums of self-adjoint operators with matrix
coefficients. This is an application of a linearization result for finite von
Neumann algebras, which is proved using asymptotic second order freeness of
Gaussian random matrices.
|
math.OA
|
we show that connes embedding problem for ii_1factors is equivalent to a statement about distributions of sums of selfadjoint operators with matrix coefficients this is an application of a linearization result for finite von neumann algebras which is proved using asymptotic second order freeness of gaussian random matrices
|
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|
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|
706.3919
|
Neutron electric polarizability from unquenched lattice QCD using the
background field approach
|
A calculational scheme for obtaining the electric polarizability of the
neutron in lattice QCD with dynamical quarks is developed, using the background
field approach. The scheme differs substantially from methods previously used
in the quenched approximation, the physical reason being that the QCD ensemble
is no longer independent of the external electromagnetic field in the dynamical
quark case. One is led to compute (certain integrals over) four-point
functions. Particular emphasis is also placed on the physical role of constant
external gauge fields on a finite lattice; the presence of these fields
complicates the extraction of polarizabilities, since it gives rise to an
additional shift of the neutron mass unrelated to polarizability effects. The
method is tested on a SU(3) flavor-symmetric ensemble furnished by the MILC
Collaboration, corresponding to a pion mass of m_pi = 759 MeV. Disconnected
diagrams are evaluated using stochastic estimation. A small negative electric
polarizability of alpha =(-2.0 +/- 0.9) 10^(-4) fm^3 is found for the neutron
at this rather large pion mass; this result does not seem implausible in view
of the qualitative behavior of alpha as a function of m_pi suggested by Chiral
Effective Theory.
|
hep-lat
|
a calculational scheme for obtaining the electric polarizability of the neutron in lattice qcd with dynamical quarks is developed using the background field approach the scheme differs substantially from methods previously used in the quenched approximation the physical reason being that the qcd ensemble is no longer independent of the external electromagnetic field in the dynamical quark case one is led to compute certain integrals over fourpoint functions particular emphasis is also placed on the physical role of constant external gauge fields on a finite lattice the presence of these fields complicates the extraction of polarizabilities since it gives rise to an additional shift of the neutron mass unrelated to polarizability effects the method is tested on a su3 flavorsymmetric ensemble furnished by the milc collaboration corresponding to a pion mass of m_pi 759 mev disconnected diagrams are evaluated using stochastic estimation a small negative electric polarizability of alpha 20 09 104 fm3 is found for the neutron at this rather large pion mass this result does not seem implausible in view of the qualitative behavior of alpha as a function of m_pi suggested by chiral effective theory
|
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|
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|
706.392
|
Molecular dynamics simulations of the dipolar-induced formation of
magnetic nanochains and nanorings
|
Iron, cobalt and nickel nanoparticles, grown in the gas phase, are known to
arrange in chains and bracelet-like rings due to the long-range dipolar
interaction between the ferromagnetic (or super-paramagnetic) particles. We
investigate the dynamics and thermodynamics of such magnetic dipolar
nanoparticles for low densities using molecular dynamics simulations and
analyze the influence of temperature and external magnetic fields on two- and
three-dimensional systems. The obtained phase diagrams can be understood by
using simple energetic arguments.
|
cond-mat.mtrl-sci cond-mat.stat-mech
|
iron cobalt and nickel nanoparticles grown in the gas phase are known to arrange in chains and braceletlike rings due to the longrange dipolar interaction between the ferromagnetic or superparamagnetic particles we investigate the dynamics and thermodynamics of such magnetic dipolar nanoparticles for low densities using molecular dynamics simulations and analyze the influence of temperature and external magnetic fields on two and threedimensional systems the obtained phase diagrams can be understood by using simple energetic arguments
|
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|
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|
706.3921
|
The neutrino self-energy in a magnetized medium
|
In this work we calculate the neutrino self-energy in presence of a
magnetized medium. The magnetized medium consists of electrons, positrons,
neutrinos and a uniform classical magnetic field. The calculation is done
assuming the background magnetic field is weak compared to the $W$-Boson mass
squared, as a consequence of which only linear order corrections in the field
are included in the $W$ boson propagator. The electron propagator consists all
order corrections in the background field. Although the neutrino self-energy in
a magnetized medium in various limiting cases has been calculated previously in
this article we produce the most general expression of the self-energy in
absence of the Landau quantization of the charged gauge fields. We calculate
the effect of the Landau quantization of the charged leptons on the neutrino
self-energy in the general case. Our calculation is specifically suited for
situations where the background plasma may be CP symmetric.
|
hep-ph
|
in this work we calculate the neutrino selfenergy in presence of a magnetized medium the magnetized medium consists of electrons positrons neutrinos and a uniform classical magnetic field the calculation is done assuming the background magnetic field is weak compared to the wboson mass squared as a consequence of which only linear order corrections in the field are included in the w boson propagator the electron propagator consists all order corrections in the background field although the neutrino selfenergy in a magnetized medium in various limiting cases has been calculated previously in this article we produce the most general expression of the selfenergy in absence of the landau quantization of the charged gauge fields we calculate the effect of the landau quantization of the charged leptons on the neutrino selfenergy in the general case our calculation is specifically suited for situations where the background plasma may be cp symmetric
|
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|
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|
706.3922
|
CDF Central Preshower and Crack Detector Upgrade
|
The CDF Central Preshower and Crack Detector Upgrade consist of scintillator
tiles with embedded wavelength-shifting fibers, clear-fiber optical cables, and
multi-anode photomultiplier readout. A description of the detector design, test
results from R&D studies, and construction phase are reported. The upgrade was
installed late in 2004, and a large amount of proton-antiproton collider data
has been collected since then. Detector studies using those data are also
discussed.
|
physics.ins-det
|
the cdf central preshower and crack detector upgrade consist of scintillator tiles with embedded wavelengthshifting fibers clearfiber optical cables and multianode photomultiplier readout a description of the detector design test results from rd studies and construction phase are reported the upgrade was installed late in 2004 and a large amount of protonantiproton collider data has been collected since then detector studies using those data are also discussed
|
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|
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|
706.3923
|
Nonparametric estimation for dependent data with an application to panel
time series
|
In this paper we consider nonparametric estimation for dependent data, where
the observations do not necessarily come from a linear process. We study
density estimation and also discuss associated problems in nonparametric
regression using the 2-mixing dependence measure. We compare the results under
2-mixing with those derived under the assumption that the process is linear. In
the context of panel time series where one observes data from several
individuals, it is often too strong to assume the joint linearity of processes.
Instead the methods developed in this paper enable us to quantify the
dependence through 2-mixing which allows for nonlinearity. We propose an
estimator of the panel mean function and obtain its rate of convergence. We
show that under certain conditions the rate of convergence can be improved by
allowing the number of individuals in the panel to increase with time.
|
math.ST stat.TH
|
in this paper we consider nonparametric estimation for dependent data where the observations do not necessarily come from a linear process we study density estimation and also discuss associated problems in nonparametric regression using the 2mixing dependence measure we compare the results under 2mixing with those derived under the assumption that the process is linear in the context of panel time series where one observes data from several individuals it is often too strong to assume the joint linearity of processes instead the methods developed in this paper enable us to quantify the dependence through 2mixing which allows for nonlinearity we propose an estimator of the panel mean function and obtain its rate of convergence we show that under certain conditions the rate of convergence can be improved by allowing the number of individuals in the panel to increase with time
|
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|
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|
706.3924
|
Total quadruple photoionization cross section of Beryllium in a
quasiclassical framework
|
In a quasiclassical framework, we formulate the quadruple ionization by
single photon absorption of the Coulomb five-body problem. We present the
quadruple photoionization total cross section of the ground state of Beryllium
for energies up to 620 eV. Our quasiclassical results for energies close to
threshold are in agreement with the Wannier threshold law for four electron
escape. In addition, the agreement of our results with a shape formula provides
support for the overall shape of our total quadruple cross section. Finally, we
find that the photon energy where the maximum of the total photoionization
cross section occurs for single, double, triple and quadruple photoionization
of H, He, Li and Be, respectively, seems to follow a linear relation with the
threshold energy for complete break-up of the respective element.
|
physics.atom-ph
|
in a quasiclassical framework we formulate the quadruple ionization by single photon absorption of the coulomb fivebody problem we present the quadruple photoionization total cross section of the ground state of beryllium for energies up to 620 ev our quasiclassical results for energies close to threshold are in agreement with the wannier threshold law for four electron escape in addition the agreement of our results with a shape formula provides support for the overall shape of our total quadruple cross section finally we find that the photon energy where the maximum of the total photoionization cross section occurs for single double triple and quadruple photoionization of h he li and be respectively seems to follow a linear relation with the threshold energy for complete breakup of the respective element
|
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|
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|
706.3925
|
Influence of second-order corrections to the energy-dependence of
neutrino flavor conversion formulae
|
We discuss the {\em intermediate} wave-packet formalism for analytically
quantifying the energy dependence of the two-flavor conversion formula that is
usually considered for analyzing neutrino oscillations and adjusting the
focusing horn, target position and/or detector location of some flavor
conversion experiments. Following a sequence of analytical approximations where
we consider the second-order corrections in a power series expansion of the
energy, we point out a {\em residual} time-dependent phase which, in addition
to some well known wave-packet effects, can subtly modify the oscillation
parameters and limits. In the present precision era of neutrino oscillation
experiments where higher precision measurements are required, we quantify some
small corrections in neutrino flavor conversion formulae which lead to a
modified energy-dependence for $\nu_{\mu}\leftrightarrow\nu_{e}$ oscillations.
|
hep-ph
|
we discuss the em intermediate wavepacket formalism for analytically quantifying the energy dependence of the twoflavor conversion formula that is usually considered for analyzing neutrino oscillations and adjusting the focusing horn target position andor detector location of some flavor conversion experiments following a sequence of analytical approximations where we consider the secondorder corrections in a power series expansion of the energy we point out a em residual timedependent phase which in addition to some well known wavepacket effects can subtly modify the oscillation parameters and limits in the present precision era of neutrino oscillation experiments where higher precision measurements are required we quantify some small corrections in neutrino flavor conversion formulae which lead to a modified energydependence for nu_muleftrightarrownu_e oscillations
|
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|
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|
706.3926
|
Theoretical correlation between possible evidences of neutrino chiral
oscillations and polarization measurements
|
Reporting about the formalism with the Dirac equation we describe the
dynamics of chiral oscillations for a fermionic particle non-minimally coupling
with an external magnetic field. For massive particles, the chirality and
helicity quantum numbers represent different physical quantities of
representative importance in the study of chiral interactions, in particular,
in the context of neutrino physics. After solving the interacting Hamiltonian
(Dirac) equation for the corresponding {\em fermionic} Dirac-{\em type}
particle (neutrino) and quantifying chiral oscillations in the Dirac wave
packet framework, we avail the possibility of determining realistic neutrino
chirality conversion rates by means of (helicity) polarization measurements. We
notice that it can become feasible for some particular magnetic field
configurations with large values of {\boldmath$B$} orthogonal to the direction
of the propagating particle.
|
hep-ph
|
reporting about the formalism with the dirac equation we describe the dynamics of chiral oscillations for a fermionic particle nonminimally coupling with an external magnetic field for massive particles the chirality and helicity quantum numbers represent different physical quantities of representative importance in the study of chiral interactions in particular in the context of neutrino physics after solving the interacting hamiltonian dirac equation for the corresponding em fermionic diracem type particle neutrino and quantifying chiral oscillations in the dirac wave packet framework we avail the possibility of determining realistic neutrino chirality conversion rates by means of helicity polarization measurements we notice that it can become feasible for some particular magnetic field configurations with large values of boldmathb orthogonal to the direction of the propagating particle
|
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|
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|
706.3927
|
The X-ray binary population in M33: II. X-ray spectra and variability
|
In this paper we investigate the X-ray spectra and X-ray spectral variability
of compact X-ray sources for 3 Chandra observations of the Local Group galaxy
M33. The observations are centered on the nucleus and the star forming region
NGC 604. In the observations 261 sources have been detected. For a total of 43
sources the number of net counts is above 100, sufficient for a more detailed
spectral fitting. Of these sources, 25 have been observed in more than one
observation, allowing the study of spectral variability on ~months timescales.
A quarter of the sources are found to be variable between observations.
However, except for two foreground sources, no source is variable within any
observation above the 99% confidence level. Only six sources show significant
spectral variability between observations. A comparison of N_H values with HI
observations shows that X-ray absorption values are consistent with Galactic
X-ray binaries and most sources in M33 are intrinsically absorbed. The pattern
of variability and the spectral parameters of these sources are consistent with
the M33 X-ray source population being dominated by X-ray binaries: Two thirds
of the 43 bright sources have spectral and timing properties consistent with
X-ray binaries; we also find two candidates for super-soft sources and two
candidates for quasi-soft sources.
|
astro-ph
|
in this paper we investigate the xray spectra and xray spectral variability of compact xray sources for 3 chandra observations of the local group galaxy m33 the observations are centered on the nucleus and the star forming region ngc 604 in the observations 261 sources have been detected for a total of 43 sources the number of net counts is above 100 sufficient for a more detailed spectral fitting of these sources 25 have been observed in more than one observation allowing the study of spectral variability on months timescales a quarter of the sources are found to be variable between observations however except for two foreground sources no source is variable within any observation above the 99 confidence level only six sources show significant spectral variability between observations a comparison of n_h values with hi observations shows that xray absorption values are consistent with galactic xray binaries and most sources in m33 are intrinsically absorbed the pattern of variability and the spectral parameters of these sources are consistent with the m33 xray source population being dominated by xray binaries two thirds of the 43 bright sources have spectral and timing properties consistent with xray binaries we also find two candidates for supersoft sources and two candidates for quasisoft sources
|
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|
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|
706.3928
|
Small Corrections to the Tunneling Phase Time Formulation
|
After reexamining the above barrier diffusion problem where we notice that
the wave packet collision implies the existence of {\em multiple} reflected and
transmitted wave packets, we analyze the way of obtaining phase times for
tunneling/reflecting particles in a particular colliding configuration where
the idea of multiple peak decomposition is recovered. To partially overcome the
analytical incongruities which frequently rise up when the stationary phase
method is adopted for computing the (tunneling) phase time expressions, we
present a theoretical exercise involving a symmetrical collision between two
identical wave packets and a unidimensional squared potential barrier where the
scattered wave packets can be recomposed by summing the amplitudes of
simultaneously reflected and transmitted wave components so that the conditions
for applying the stationary phase principle are totally recovered. Lessons
concerning the use of the stationary phase method are drawn.
|
hep-ph
|
after reexamining the above barrier diffusion problem where we notice that the wave packet collision implies the existence of em multiple reflected and transmitted wave packets we analyze the way of obtaining phase times for tunnelingreflecting particles in a particular colliding configuration where the idea of multiple peak decomposition is recovered to partially overcome the analytical incongruities which frequently rise up when the stationary phase method is adopted for computing the tunneling phase time expressions we present a theoretical exercise involving a symmetrical collision between two identical wave packets and a unidimensional squared potential barrier where the scattered wave packets can be recomposed by summing the amplitudes of simultaneously reflected and transmitted wave components so that the conditions for applying the stationary phase principle are totally recovered lessons concerning the use of the stationary phase method are drawn
|
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|
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|
706.3929
|
The Exact Correspondence between Phase Times and Dwell Times in a
Symmetrical Quantum Tunneling Configuration
|
The general and explicit relation between the phase time and the dwell time
for quantum tunneling or scattering is investigated. Considering a symmetrical
collision of two identical wave packets with an one-dimensional barrier, here
we demonstrate that these two distinct transit time definitions give connected
results where, however, the phase time (group delay) accurately describes the
exact position of the scattered particles. The analytical difficulties that
arise when the stationary phase method is employed for obtaining phase
(traversal) times are all overcome. Multiple wave packet decomposition allows
us to recover the exact position of the reflected and transmitted waves in
terms of the phase time, which, in addition to the exact relation between the
phase time and the dwell time, leads to right interpretation for both of them.
|
quant-ph
|
the general and explicit relation between the phase time and the dwell time for quantum tunneling or scattering is investigated considering a symmetrical collision of two identical wave packets with an onedimensional barrier here we demonstrate that these two distinct transit time definitions give connected results where however the phase time group delay accurately describes the exact position of the scattered particles the analytical difficulties that arise when the stationary phase method is employed for obtaining phase traversal times are all overcome multiple wave packet decomposition allows us to recover the exact position of the reflected and transmitted waves in terms of the phase time which in addition to the exact relation between the phase time and the dwell time leads to right interpretation for both of them
|
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|
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|
706.393
|
Relativistic tunneling and accelerated transmission
|
We obtain the solutions for the tunneling zone of a one-dimensional
electrostatic potential in the relativistic (Dirac to Klein-Gordon) wave
equation regime when the incoming wave packet exhibits the possibility of being
almost totally transmitted through the potential barrier. The conditions for
the occurrence of accelerated and, eventually, superluminal tunneling
transmission probabilities are all quantified and the problematic superluminal
interpretation originated from the study based on non-relativistic dynamics of
tunneling is overcome. The treatment of the problem suggests revealing insights
into condensed-matter experiments using electrostatic barriers in single- and
bi-layer graphene, for which the accelerated tunneling effect deserves a more
careful investigation.
|
quant-ph
|
we obtain the solutions for the tunneling zone of a onedimensional electrostatic potential in the relativistic dirac to kleingordon wave equation regime when the incoming wave packet exhibits the possibility of being almost totally transmitted through the potential barrier the conditions for the occurrence of accelerated and eventually superluminal tunneling transmission probabilities are all quantified and the problematic superluminal interpretation originated from the study based on nonrelativistic dynamics of tunneling is overcome the treatment of the problem suggests revealing insights into condensedmatter experiments using electrostatic barriers in single and bilayer graphene for which the accelerated tunneling effect deserves a more careful investigation
|
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|
[-0.19166716772894027, 0.1431609108957334, -0.09319861288931147, 0.08181499135246792, -0.06296402633454942, -0.1755118678031745, 0.07476117506388726, 0.3259571421453181, -0.26692165177790267, -0.25248228284808827, -0.008828182647680389, -0.2909314449986114, -0.1479461083517355, 0.23028333222164826, 0.04754986390745377, 0.03954973860698588, 0.07208056772566017, -0.0016736417607057328, -0.04386436384554733, -0.1680249114539109, 0.31451849237954077, 0.08048571047245287, 0.29044450991147874, 0.10962378744985543, 0.06699136193549517, 0.06507746610498312, 0.030890810873482704, -0.005921765942783917, -0.12079516236725099, 0.044459660257915874, 0.17069968740757116, 0.02283389707479407, 0.28897196277245585, -0.5070345550821181, -0.27704838337376714, 0.039797540311245064, 0.20133456752599016, 0.1732039986869923, -0.11155577968676487, -0.34231092834699095, -0.0051913577378453575, -0.12260036897279468, -0.17034235857792346, -0.015355747923547146, -0.01778227213185792, 0.004027396465615169, -0.21788831879887, 0.12835878730801792, 0.003802446475852847, -0.011281238028816148, -0.10894959649600673, -0.05233466835217733, -0.02146136175439346, 0.04470648852949642, 0.07792129920334463, -0.03361786418256587, 0.13151983059394887, -0.11770805579155921, -0.10007824857408802, 0.4019317293685733, -0.019671692088355914, -0.17897929647462626, 0.14800505379589238, -0.1798598306052679, -0.022703573016413285, 0.20130672470173416, 0.11859884431275229, 0.0875705319648499, -0.17574780653347832, 0.06877634178461306, 0.022901977290566006, 0.07450160700525385, 0.1269421338185887, 0.05852810817533264, 0.26181120744121134, 0.16303491022428682, 0.02880403469773192, 0.12386092216726027, -0.11575229955590605, -0.11973798361049928, -0.29387647979984094, -0.17294875201175683, -0.16842583320491636, 0.09017148110005484, -0.037471959716212415, -0.18847880477779635, 0.40369506023239854, 0.17148289279829637, 0.13832432975736902, -0.026202782270653795, 0.2922177906376401, 0.18089180945090072, 0.01369178205655486, 0.03408136414637899, 0.2628328638041721, 0.13530905027280324, 0.11571012529791058, -0.27504291115374324, 0.0432176717280812, 0.0207938101352649]
|
706.3931
|
The coupling constants for an electroweak model with a $SU(4)_{PS}
\otimes SU(4)_{EW}$ unification symmetry
|
We introduce the sequence of spontaneous symmetry breaking of a coupling
between Pati-Salam and electroweak symmetries $SU(4)_{PS} \otimes SU(4)_{EW}$
in order to establish a mathematically consistent relation among the coupling
constants at grand unification energy scale. With the values of baryon minus
lepton quantum numbers of known quarks and leptons, by including right-handed
neutrinos, we can find the mixing angle relations at different energy levels up
to the electromagnetic $U(1)_{EM}$ scale.
|
hep-ph
|
we introduce the sequence of spontaneous symmetry breaking of a coupling between patisalam and electroweak symmetries su4_ps otimes su4_ew in order to establish a mathematically consistent relation among the coupling constants at grand unification energy scale with the values of baryon minus lepton quantum numbers of known quarks and leptons by including righthanded neutrinos we can find the mixing angle relations at different energy levels up to the electromagnetic u1_em scale
|
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|
[-0.15686084448492954, 0.3530323950839894, 0.013152553526950734, 0.17506299673446588, -0.07396410115595375, -0.12633541523745018, 0.06414028475826074, 0.32521372511982916, -0.2607219574706895, -0.3547277586002435, -0.021353770022480085, -0.2514595004862973, 0.010062176468116897, 0.03995594132159438, 0.07781720706926924, 0.022586759166733826, -0.07080328115262091, -0.004837561644879835, -0.11557299194059202, -0.15736467783572153, 0.31554951069078274, 0.0012767432174379271, 0.27231862981404575, 0.06003016397756125, 0.15329902816696891, -0.08325920087684478, 0.035653156620849454, -0.13275139768208777, -0.12123575431427785, 0.05199433740095368, 0.15721367097991917, 0.014499868299545986, 0.12274489988173758, -0.39948332856542296, -0.09390069950771118, 0.15346288181608542, 0.11672416201659612, 0.11429709065372923, -0.05306120169282492, -0.30849283008304024, 0.06863317655931626, -0.1898466928812143, -0.13605290962316627, -0.10133068754470774, -0.06500669453026993, -0.07828855197876691, -0.3642321525540735, 0.14170790500938893, -0.06732845879159868, 0.0605675753738199, 0.015129863650404982, -0.12382002764248422, -0.08635160960257053, 0.04663356626406312, 0.22986976164725742, -0.012146791809105448, 0.08854869613590251, -0.18645798985713294, -0.17057300615789636, 0.4688093103202326, -0.05357170873487901, -0.15713073256026422, 0.12723586756203856, -0.1446152316921923, -0.18184283895950232, 0.08796260013644185, 0.14334051035610693, 0.028879245769764694, -0.10770632861448186, 0.15577089349972084, -0.0479604495822319, 0.17939034697732756, 0.10049809318568026, 0.07732440208201297, 0.2620427210948297, 0.1404854505722012, 0.06200665666588715, 0.026306852166141783, -0.02044274409168533, -0.08701943299134395, -0.44616300048572677, -0.09967079374806158, -0.09882727843443198, 0.12221768568935139, -0.11415128107951854, -0.04416955098775881, 0.4410562250230994, 0.09756003790535032, 0.22090253569185733, 0.08888380709769471, 0.2341030751022377, 0.07785616116598248, 0.1452214851409995, 0.02216826074623636, 0.2898755760730377, 0.18143970801694584, 0.07301326492701524, -0.27595409893297723, -0.07168344179434435, 0.14995689104710305]
|
706.3932
|
Dirac neutrino mass from the beta decay end-point modified by the
dynamics of a Lorentz-violating equation of motion
|
Using a generalized procedure for obtaining the equation of motion of a
propagating fermionic particle, we examine previous claims for a lightlike
preferred axis embedded in the framework of Lorentz-invariance violation with
preserved algebra. In a high energy scale, the corresponding equation of motion
is reduced to a conserving lepton number chiral (VSR) equation, and in a low
energy scale, the Dirac equation for a free is recovered. The new dynamics
introduces some novel ingredients (modified cross section) to the phenomenology
of the tritium beta decay end-point.
|
hep-ph
|
using a generalized procedure for obtaining the equation of motion of a propagating fermionic particle we examine previous claims for a lightlike preferred axis embedded in the framework of lorentzinvariance violation with preserved algebra in a high energy scale the corresponding equation of motion is reduced to a conserving lepton number chiral vsr equation and in a low energy scale the dirac equation for a free is recovered the new dynamics introduces some novel ingredients modified cross section to the phenomenology of the tritium beta decay endpoint
|
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|
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|
706.3933
|
Negative capacitance in organic semiconductor devices: bipolar injection
and charge recombination mechanism
|
We report negative capacitance at low frequencies in organic semiconductor
based diodes and show that it appears only under bipolar injection conditions.
We account quantitatively for this phenomenon by the recombination current due
to electron-hole annihilation. Simple addition of the recombination current to
the well established model of space charge limited current in the presence of
traps, yields excellent fits to the experimentally measured admittance data.
The dependence of the extracted characteristic recombination time on the bias
voltage is indicative of a recombination process which is mediated by localized
traps.
|
physics.chem-ph
|
we report negative capacitance at low frequencies in organic semiconductor based diodes and show that it appears only under bipolar injection conditions we account quantitatively for this phenomenon by the recombination current due to electronhole annihilation simple addition of the recombination current to the well established model of space charge limited current in the presence of traps yields excellent fits to the experimentally measured admittance data the dependence of the extracted characteristic recombination time on the bias voltage is indicative of a recombination process which is mediated by localized traps
|
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|
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|
706.3934
|
Foundations of Relational Particle Dynamics
|
Relational particle dynamics include the dynamics of pure shape and cases in
which absolute scale or absolute rotation are additionally meaningful. These
are interesting as regards the absolute versus relative motion debate as well
as discussion of conceptual issues connected with the problem of time in
quantum gravity. In spatial dimension 1 and 2 the relative configuration spaces
of shapes are n-spheres and complex projective spaces, from which knowledge I
construct natural mechanics on these spaces. I also show that these coincide
with Barbour's indirectly-constructed relational dynamics by performing a full
reduction on the latter. Then the identification of the configuration spaces as
n-spheres and complex projective spaces, for which spaces much mathematics is
available, significantly advances the understanding of Barbour's relational
theory in spatial dimensions 1 and 2. I also provide the parallel study of a
new theory for which positon and scale are purely relative but orientation is
absolute. The configuration space for this is an n-sphere regardless of the
spatial dimension, which renders this theory a more tractable arena for
investigation of implications of scale invariance than Barbour's theory itself.
|
gr-qc
|
relational particle dynamics include the dynamics of pure shape and cases in which absolute scale or absolute rotation are additionally meaningful these are interesting as regards the absolute versus relative motion debate as well as discussion of conceptual issues connected with the problem of time in quantum gravity in spatial dimension 1 and 2 the relative configuration spaces of shapes are nspheres and complex projective spaces from which knowledge i construct natural mechanics on these spaces i also show that these coincide with barbours indirectlyconstructed relational dynamics by performing a full reduction on the latter then the identification of the configuration spaces as nspheres and complex projective spaces for which spaces much mathematics is available significantly advances the understanding of barbours relational theory in spatial dimensions 1 and 2 i also provide the parallel study of a new theory for which positon and scale are purely relative but orientation is absolute the configuration space for this is an nsphere regardless of the spatial dimension which renders this theory a more tractable arena for investigation of implications of scale invariance than barbours theory itself
|
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|
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|
706.3935
|
Feedback in the Antennae Galaxies (NGC 4038/9): I. High-Resolution
Infrared Spectroscopy of Winds from Super Star Clusters
|
We present high-resolution (R ~ 24,600) near-IR spectroscopy of the youngest
super star clusters (SSCs) in the prototypical starburst merger, the Antennae
Galaxies. These SSCs are young (3-7 Myr old) and massive (10^5 - 10^7 M_sun for
a Kroupa IMF) and their spectra are characterized by broad, extended Br-gamma
emission, so we refer to them as emission-line clusters (ELCs) to distinguish
them from older SSCs. The Brgamma lines of most ELCs have supersonic widths
(60-110 km/s FWHM) and non-Gaussian wings whose velocities exceed the clusters'
escape velocities. This high-velocity unbound gas is flowing out in winds that
are powered by the clusters' massive O and W-R stars over the course of at
least several crossing times. The large sizes of some ELCs relative to those of
older SSCs may be due to expansion caused by these outflows; many of the ELCs
may not survive as bound stellar systems, but rather dissipate rapidly into the
field population. The observed tendency of older ELCs to be more compact than
young ones is consistent with the preferential survival of the most
concentrated clusters at a given age.
|
astro-ph
|
we present highresolution r 24600 nearir spectroscopy of the youngest super star clusters sscs in the prototypical starburst merger the antennae galaxies these sscs are young 37 myr old and massive 105 107 m_sun for a kroupa imf and their spectra are characterized by broad extended brgamma emission so we refer to them as emissionline clusters elcs to distinguish them from older sscs the brgamma lines of most elcs have supersonic widths 60110 kms fwhm and nongaussian wings whose velocities exceed the clusters escape velocities this highvelocity unbound gas is flowing out in winds that are powered by the clusters massive o and wr stars over the course of at least several crossing times the large sizes of some elcs relative to those of older sscs may be due to expansion caused by these outflows many of the elcs may not survive as bound stellar systems but rather dissipate rapidly into the field population the observed tendency of older elcs to be more compact than young ones is consistent with the preferential survival of the most concentrated clusters at a given age
|
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|
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|
706.3936
|
On the commuting charges for the highest dimension SU(2) operators in
planar ${\cal N}=4$ SYM
|
We consider the highest anomalous dimension operator in the SU(2) sector of
planar ${\cal N}=4$ SYM at all-loop, though neglecting wrapping contributions.
In any case, the latter enter the loop expansion only after a precise
length-depending order. In the thermodynamic limit we write both a linear
integral equation for the Bethe root density and a linear system obeyed by the
commuting charges. Consequently, we determine the leading strong coupling
contribution to the density and from this an approximation to the leading and
sub-leading terms of any charge $Q_r$: it scales as $\lambda ^{1/4-r/2}$, which
generalises the Gubser-Klebanov-Polyakov energy law. In the end, we briefly
extend these considerations to finite lengths and 'excited' operators by using
the idea of a non-linear integral equation.
|
hep-th
|
we consider the highest anomalous dimension operator in the su2 sector of planar cal n4 sym at allloop though neglecting wrapping contributions in any case the latter enter the loop expansion only after a precise lengthdepending order in the thermodynamic limit we write both a linear integral equation for the bethe root density and a linear system obeyed by the commuting charges consequently we determine the leading strong coupling contribution to the density and from this an approximation to the leading and subleading terms of any charge q_r it scales as lambda 14r2 which generalises the gubserklebanovpolyakov energy law in the end we briefly extend these considerations to finite lengths and excited operators by using the idea of a nonlinear integral equation
|
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|
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|
706.3937
|
Rips complexes and covers in the uniform category
|
James \cite{Jam} introduced uniform covering maps as an analog of covering
maps in the topological category. Subsequently Berestovskii and Plaut
\cite{BP3} introduced a theory of covers for uniform spaces generalizing their
results for topological groups \cite{BP1}-\cite{BP2}. Their main concepts are
discrete actions and pro-discrete actions, respectively. In case of
pro-discrete actions Berestovskii and Plaut provided an analog of the universal
covering space and their theory works well for the so-called coverable spaces.
As will be seen in Section \ref{SECTION-Comparison}, \cite{BP3} generalizes
only regular covering maps in topology and pro-discrete actions may not be
preserved by compositions.
In this paper we redefine the uniform covering maps and we generalize
pro-discrete actions using Rips complexes and the chain lifting property. We
expand the concept of generalized paths of Krasinkiewicz and Minc
\cite{KraMin}.
|
math.MG math.GN
|
james citejam introduced uniform covering maps as an analog of covering maps in the topological category subsequently berestovskii and plaut citebp3 introduced a theory of covers for uniform spaces generalizing their results for topological groups citebp1citebp2 their main concepts are discrete actions and prodiscrete actions respectively in case of prodiscrete actions berestovskii and plaut provided an analog of the universal covering space and their theory works well for the socalled coverable spaces as will be seen in section refsectioncomparison citebp3 generalizes only regular covering maps in topology and prodiscrete actions may not be preserved by compositions in this paper we redefine the uniform covering maps and we generalize prodiscrete actions using rips complexes and the chain lifting property we expand the concept of generalized paths of krasinkiewicz and minc citekramin
|
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|
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|
706.3938
|
The UV-optical Galaxy Color-Magnitude Diagram I: Basic Properties
|
We have analyzed the bivariate distribution of galaxies as a function of
ultraviolet-optical colors and absolute magnitudes in the local universe. The
sample consists of galaxies with redshifts and optical photometry from the
Sloan Digital Sky Survey (SDSS) main galaxy sample matched with detections in
the near-ultraviolet (NUV) and far-ultraviolet (FUV) bands in the Medium
Imaging Survey being carried out by the Galaxy Evolution Explorer (GALEX)
satellite. In the (NUV-r)_{0.1} vs. M_{r,0.1} galaxy color-magnitude diagram,
the galaxies separate into two well-defined blue and red sequences. The
(NUV-r)_{0.1} color distribution at each M_{r,0.1} is not well fit by the sum
of two Gaussians due to an excess of galaxies in between the two sequences. The
peaks of both sequences become redder with increasing luminosity with a
distinct blue peak visible up to M_{r,0.1}\sim-23. The r_{0.1}-band luminosity
functions vary systematically with color, with the faint end slope and
characteristic luminosity gradually increasing with color. After correcting for
attenuation due to dust, we find that approximately one quarter of the color
variation along the blue sequence is due to dust with the remainder due to star
formation history and metallicity. Finally, we present the distribution of
galaxies as a function of specific star formation rate and stellar mass. The
specific star formation rates imply that galaxies along the blue sequence
progress from low mass galaxies with star formation rates that increase
somewhat with time to more massive galaxies with a more or less constant star
formation rate. Above a stellar mass of ~10^10.5 M_{sun}, galaxies with low
ratios of current to past averaged star formation rate begin to dominate.
|
astro-ph
|
we have analyzed the bivariate distribution of galaxies as a function of ultravioletoptical colors and absolute magnitudes in the local universe the sample consists of galaxies with redshifts and optical photometry from the sloan digital sky survey sdss main galaxy sample matched with detections in the nearultraviolet nuv and farultraviolet fuv bands in the medium imaging survey being carried out by the galaxy evolution explorer galex satellite in the nuvr_01 vs m_r01 galaxy colormagnitude diagram the galaxies separate into two welldefined blue and red sequences the nuvr_01 color distribution at each m_r01 is not well fit by the sum of two gaussians due to an excess of galaxies in between the two sequences the peaks of both sequences become redder with increasing luminosity with a distinct blue peak visible up to m_r01sim23 the r_01band luminosity functions vary systematically with color with the faint end slope and characteristic luminosity gradually increasing with color after correcting for attenuation due to dust we find that approximately one quarter of the color variation along the blue sequence is due to dust with the remainder due to star formation history and metallicity finally we present the distribution of galaxies as a function of specific star formation rate and stellar mass the specific star formation rates imply that galaxies along the blue sequence progress from low mass galaxies with star formation rates that increase somewhat with time to more massive galaxies with a more or less constant star formation rate above a stellar mass of 10105 m_sun galaxies with low ratios of current to past averaged star formation rate begin to dominate
|
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|
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|
706.3939
|
Future Directions in Parity Violation: From Quarks to the Cosmos
|
I discuss the prospects for future studies of parity-violating (PV)
interactions at low energies and the insights they might provide about open
questions in the Standard Model as well as physics that lies beyond it. I cover
four types of parity-violating observables: PV electron scattering; PV hadronic
interactions; PV correlations in weak decays; and searches for the permanent
electric dipole moments of quantum systems.
|
nucl-th
|
i discuss the prospects for future studies of parityviolating pv interactions at low energies and the insights they might provide about open questions in the standard model as well as physics that lies beyond it i cover four types of parityviolating observables pv electron scattering pv hadronic interactions pv correlations in weak decays and searches for the permanent electric dipole moments of quantum systems
|
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|
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|
706.394
|
The Northern Site of the Pierre Auger Observatory
|
The Pierre Auger Observatory is a multi-national project for research on
ultra-high energy cosmic rays. The Southern Auger Observatory in Mendoza
province, Argentina, is approaching completion in 2007 with an instrumented
area of 3,000 km^2. It will accurately measure the spectrum and composition of
ultra-high energy cosmic rays up to and beyond the predicted GZK feature. We
are obtaining results on the energy spectrum, mass composition and distribution
of arrival directions on the southern sky. The Northern Auger Observatory is
designed to complete and extend the investigations begun in the South. It will
establish charged particle astronomy and thus open a new window into the
universe. The distribution of arrival directions of the highest energy events
will point the way to unveiling the almost century old mystery of the origin
and nature of ultra-high energy cosmic rays. Achieving this goal requires
collecting many more events in spite of the steeply falling energy spectrum.
The planned northern site will have an instrumented area of 4,000 square miles
(10,370 km}^2 in Southeast Colorado, USA. The paper covers the science of
charged particle astronomy, the layout and the technical implementation of the
Northern Auger Observatory.
|
astro-ph
|
the pierre auger observatory is a multinational project for research on ultrahigh energy cosmic rays the southern auger observatory in mendoza province argentina is approaching completion in 2007 with an instrumented area of 3000 km2 it will accurately measure the spectrum and composition of ultrahigh energy cosmic rays up to and beyond the predicted gzk feature we are obtaining results on the energy spectrum mass composition and distribution of arrival directions on the southern sky the northern auger observatory is designed to complete and extend the investigations begun in the south it will establish charged particle astronomy and thus open a new window into the universe the distribution of arrival directions of the highest energy events will point the way to unveiling the almost century old mystery of the origin and nature of ultrahigh energy cosmic rays achieving this goal requires collecting many more events in spite of the steeply falling energy spectrum the planned northern site will have an instrumented area of 4000 square miles 10370 km2 in southeast colorado usa the paper covers the science of charged particle astronomy the layout and the technical implementation of the northern auger observatory
|
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|
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|
706.3941
|
Intrinsic alignments of galaxies and their effects on weak lensing
detections of mass concentrations
|
In this paper we investigate the influence of the intrinsic alignment of
background galaxies on weak lensing detections of mass concentrations.
Specifically, we analyze the number counts of false peaks resulting from
intrinsic ellipticities in lensing convergence maps. Including the alignment of
source galaxies, the full noise variance from intrinsic ellipticites in
convergence $\kappa$-maps can be written as
$\sigma^2_0=\sigma^2_{0ran}+\sigma^2_{0corr}$, where $\sigma^2_{0ran}$ is the
noise contributed from randomly oriented source galaxies and $\sigma^2_{0corr}$
denotes the additional noise from intrinsic alignments. However, it is
observationally difficult to measure $\sigma^2_{0corr}$ and usually only
$\sigma^2_{0ran}$ can be estimated in weak lensing observations. Thus the
observational signal-to-noise ratio is often defined with respect to
$\sigma_{0ran}$, which is denoted as $\nu_{ran}$ in this paper. The true
signal-to-noise ratio $\nu$ in terms of $\sigma_0$ is then
$\nu=\nu_{ran}/(1+\sigma^2_{0corr}/\sigma^2_{0ran})^{1/2}$. Given a detection
threshold on $\nu_{ran}$, a larger value of $\sigma^2_{0corr}/\sigma^2_{0ran}$
leads to a lower threshold on $\nu$ and therefore a larger expected number of
false peaks. With $\sigma^2_{0corr}/\sigma^2_{0ran}\sim 10%$, the average
number of false peaks with $\nu_{ran}\ge 3.5$ nearly doubles compared to that
without considering the alignment, and for $\nu_{ran}\ge 5$, the number is
tripled. As a result, the efficiency of weak lensing cluster detection degrades
significantly. (Abridged)
|
astro-ph
|
in this paper we investigate the influence of the intrinsic alignment of background galaxies on weak lensing detections of mass concentrations specifically we analyze the number counts of false peaks resulting from intrinsic ellipticities in lensing convergence maps including the alignment of source galaxies the full noise variance from intrinsic ellipticites in convergence kappamaps can be written as sigma2_0sigma2_0ransigma2_0corr where sigma2_0ran is the noise contributed from randomly oriented source galaxies and sigma2_0corr denotes the additional noise from intrinsic alignments however it is observationally difficult to measure sigma2_0corr and usually only sigma2_0ran can be estimated in weak lensing observations thus the observational signaltonoise ratio is often defined with respect to sigma_0ran which is denoted as nu_ran in this paper the true signaltonoise ratio nu in terms of sigma_0 is then nunu_ran1sigma2_0corrsigma2_0ran12 given a detection threshold on nu_ran a larger value of sigma2_0corrsigma2_0ran leads to a lower threshold on nu and therefore a larger expected number of false peaks with sigma2_0corrsigma2_0ransim 10 the average number of false peaks with nu_range 35 nearly doubles compared to that without considering the alignment and for nu_range 5 the number is tripled as a result the efficiency of weak lensing cluster detection degrades significantly abridged
|
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|
[-0.11818814687380243, 0.08410153837631577, -0.019114247614355838, 0.09517457186365905, -0.04786890538272691, -0.07934499519077413, 0.05486484783139768, 0.3468968725520308, -0.21532322673390256, -0.3793954128673447, 0.07568106225453844, -0.29828442159139185, -0.08508938511722194, 0.18744572077665236, -0.07596312897057152, -0.0009580190703475281, 0.04122667061354783, 0.02782534525739839, -0.06414579696644543, -0.26745565402645455, 0.30460341908316046, 0.11335324470090437, 0.2711988191563844, -0.005150821530665068, 0.07499199647028708, -0.04638331259459095, -0.06741630325648104, 0.07323988902625507, -0.1012191411334994, 0.06148468903468355, 0.20780520735095945, 0.12172287608922014, 0.24325198093024286, -0.3023706195552064, -0.14023373014820012, 0.1412677769549191, 0.18045448314185944, 0.09511309605959864, -0.03320156038503426, -0.286329216617362, 0.1361030018863106, -0.12714205448940882, -0.07016864859843222, 0.027901652877715052, 0.0145116321509704, 0.053456305487602745, -0.2769943621546111, 0.1699266241883616, 0.036440921124860484, 0.0532181312168098, -0.04545841810265657, -0.12036547046306584, -0.02509996290166822, 0.09530862964912439, 0.07790093454937248, 0.07630231104786103, 0.13925396594466924, -0.17630140470472447, -0.032666984178080304, 0.397754364616602, -0.10741094198665055, -0.17718046795293366, 0.171591271208498, -0.18224833714497357, -0.13474307566534466, 0.16230396707744701, 0.18539282324744147, 0.08890712084552355, -0.11594075419808454, 0.038471891346093995, 0.030919576964705535, 0.23501157987376917, 0.09610303182916655, 0.06960192551259356, 0.23859970781030942, 0.11107501773411692, 0.11197953463947076, 0.14319827380139663, -0.2055376565916484, 0.010109843175007922, -0.253558979554446, -0.0975207738730482, -0.1963354410064589, 0.13375474743509624, -0.11489778466278475, -0.1373827714908301, 0.35859230048979795, 0.1593119792991986, 0.23925609273567755, 0.11540999490851232, 0.33546133071143663, 0.145322125284229, 0.07031258761075466, 0.022084166055403486, 0.2906951197858333, 0.14785209734691307, 0.00575928207431191, -0.19010574451354129, 0.10092576117882424, -0.027515987325307873]
|
706.3942
|
Chiral Symmetries and Low Energy Searches for New Physics
|
I discuss low energy searches for new physics beyond the Standard Model,
identifying the role played by chiral symmetries in these searches and in
various new physics scenarios. I focus in particular on electric dipole moment
searches; precision studies of weak decays and electron scattering; and
neutrino properties and interactions.
|
nucl-th
|
i discuss low energy searches for new physics beyond the standard model identifying the role played by chiral symmetries in these searches and in various new physics scenarios i focus in particular on electric dipole moment searches precision studies of weak decays and electron scattering and neutrino properties and interactions
|
[['i', 'discuss', 'low', 'energy', 'searches', 'for', 'new', 'physics', 'beyond', 'the', 'standard', 'model', 'identifying', 'the', 'role', 'played', 'by', 'chiral', 'symmetries', 'in', 'these', 'searches', 'and', 'in', 'various', 'new', 'physics', 'scenarios', 'i', 'focus', 'in', 'particular', 'on', 'electric', 'dipole', 'moment', 'searches', 'precision', 'studies', 'of', 'weak', 'decays', 'and', 'electron', 'scattering', 'and', 'neutrino', 'properties', 'and', 'interactions']]
|
[-0.09942870790138841, 0.23937792912125588, 0.011553476493572816, 0.15691763563081623, -0.06876342615578324, -0.1583896913379431, 0.012219514864264057, 0.295606792345643, -0.228876324146986, -0.33817052640020845, 0.04346098805079237, -0.30898845767602323, -0.07468699442222715, 0.16685890113469212, 0.11277539749629796, 0.021787454579025506, 0.022880351790226995, -0.03778661381453276, -0.07044660029001534, -0.1511232423968613, 0.2775312237255275, 0.10066451608203351, 0.26039360641501846, 0.13219447894021868, -0.01620174603536725, 0.07111894574481994, -0.07258872458711267, -0.03472276970744133, -0.15267811506986617, 0.07466763718053698, 0.20117764990776776, 0.0977532824408263, 0.16316065937280655, -0.4689398676156998, -0.17919458388350903, 0.12703910963609816, 0.12606868783477693, 0.10562230767682194, -0.2172523040068336, -0.33467838242650033, -0.00814494576305151, -0.15080810545943676, -0.13540863097645342, -0.1254548038635403, -0.002957870103418827, 0.03276025481522083, -0.2628861050307751, 0.05616248421370983, 0.05320222407579422, 0.07141136176884175, -0.03972070761024952, -0.21282008747104555, 0.06370445547392592, 0.0604988369345665, 0.13040916456491686, -0.043934904411435126, 0.14099260965827853, -0.29334037270396945, -0.1902825665473938, 0.4056232814490795, -0.06703005040530115, -0.1489833868853748, 0.21385174885392189, -0.2032785996515304, -0.23083721788600087, 0.061852236352860926, 0.2493412359803915, 0.0926214826758951, -0.17496228892356158, 0.17947333900316154, 0.03253408210352063, 0.07584374546771869, 0.010680115427821874, 0.1094567554909736, 0.3096298330649734, 0.22634491566102952, 0.011991818910464644, -0.014556115418672562, -0.16787571865599601, -0.07442915918305516, -0.373137092590332, -0.09546015071682631, -0.10734273895621299, 0.008432765267789364, -0.016668458812637253, -0.05958642102777958, 0.4296979947574437, 0.1829063336737454, 0.1507659436017275, -0.0846240926720202, 0.2688160717440769, 0.07814839128404856, 0.0335341359092854, -0.010077402414754032, 0.3675320916250348, 0.1430782522680238, 0.0868016555532813, -0.24130722023546697, -0.0008248553611338138, 0.07290771605446934]
|
706.3943
|
The globular cluster system in NGC5866: optical observations from HST
Advanced Camera for Surveys
|
We perform a detailed study of the Globular Cluster (GC) system in the galaxy
NGC5866 based on F435W, F555W, and F625W (~ B, V, and R) HST Advanced Camera
for Surveys images.
Adopting color, size and shape selection criteria, the final list of GC
candidates comprises 109 objects, with small estimated contamination from
background galaxies, and foreground stars.
The color distribution of the final GC sample has a bimodal form. Adopting
color to metallicity transformations derived from the Teramo--SPoT simple
stellar population model, we estimate a metallicity [Fe/H]~ -1.5, and -0.6 dex
for the blue and red peaks, respectively. A similar result is found if the
empirical color-metallicity relations derived from Galactic GCs data are used.
The two subpopulations show some of the features commonly observed in the GC
system of other galaxies, like a ``blue tilt'', higher central concentrations
of the red subsystem, and larger half--light radii at larger galactocentric
distances. However, we do not find evidence of a substantial difference between
the average sizes of red and blue clusters.
Our analysis of the GC Luminosity Function indicates a V-band Turn-Over
Magnitude V$_0^{TOM}$=23.46+-0.06, or M$_{V,0}^{TOM}\sim-7.29 +- 0.10$ mag,
using the distance modulus derived from the average of SBF and the PNLF
distances. The absolute Turn-Over Magnitude obtained agrees well with
calibrations from literature. The specific frequency is measured to be $S_N=1.4
+- 0.3$, typical for galaxies of this type.
|
astro-ph
|
we perform a detailed study of the globular cluster gc system in the galaxy ngc5866 based on f435w f555w and f625w b v and r hst advanced camera for surveys images adopting color size and shape selection criteria the final list of gc candidates comprises 109 objects with small estimated contamination from background galaxies and foreground stars the color distribution of the final gc sample has a bimodal form adopting color to metallicity transformations derived from the teramospot simple stellar population model we estimate a metallicity feh 15 and 06 dex for the blue and red peaks respectively a similar result is found if the empirical colormetallicity relations derived from galactic gcs data are used the two subpopulations show some of the features commonly observed in the gc system of other galaxies like a blue tilt higher central concentrations of the red subsystem and larger halflight radii at larger galactocentric distances however we do not find evidence of a substantial difference between the average sizes of red and blue clusters our analysis of the gc luminosity function indicates a vband turnover magnitude v_0tom2346006 or m_v0tomsim729 010 mag using the distance modulus derived from the average of sbf and the pnlf distances the absolute turnover magnitude obtained agrees well with calibrations from literature the specific frequency is measured to be s_n14 03 typical for galaxies of this type
|
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|
[-0.016609370170044713, 0.05927378407588029, -0.11445818222377316, 0.10901716246787276, -0.06886537278809815, -0.0569249127880929, 0.07964001163600187, 0.45324649911240805, -0.14031749057591827, -0.3832103809067381, 0.0037668339895649944, -0.3133481708895748, -0.025363673572558452, 0.19400029277572425, -0.07916939546079707, -0.04681785056683501, 0.08355109764754941, -0.043817496153808734, -0.07626810108195059, -0.25029484899381976, 0.26433863000732216, -0.01865003438017863, 0.21899242024561058, -0.09401044734113384, 0.054989476887255605, -0.06902452985273808, -0.0985664346538085, 0.028424477026939194, -0.17100456047462234, 0.039492939341341425, 0.2025454898633013, 0.1347962180963285, 0.21100223796383943, -0.2802516626749626, -0.15046754439806267, 0.08966016532212961, 0.20405177438182623, 0.0458564326524668, -0.07578781194492226, -0.27082905120602974, 0.06974408311154028, -0.15809218642256642, -0.18533294649595128, 0.1313184421378537, 0.08696515532054556, 0.05997241762660061, -0.23673905731577957, 0.1970404919531055, -0.0007491552423743997, 0.1501928236217022, -0.11517264115017108, -0.22293583659692168, -0.10164049654434036, 0.10454501668885184, -0.027066021066795138, 0.08689888221748074, 0.188641267859826, -0.1090042091163923, 0.022442397403730347, 0.3997213218806012, -0.07511559376559619, 0.003569916123524308, 0.1954490488351439, -0.17804059285533316, -0.1361463361785614, 0.057988660995241456, 0.1491629576329225, 0.11010696822553914, -0.19701051114316215, -0.0005023128035515713, 0.012380939922877587, 0.24148752062215603, 0.05538261088284863, 0.07661733380421408, 0.2689636142022209, 0.09786534395529348, 0.048892328082209655, 0.07684130403842053, -0.2624427409058886, -0.0155937622361567, -0.23522431375749875, -0.05232925542804878, -0.13063202852416517, 0.07084791093237593, -0.2221552225335342, -0.1285118800166986, 0.3396038394369368, 0.10712254340413503, 0.2584890757581369, 0.09549677054071383, 0.29477677721089485, 0.10209583382259423, 0.17506485021773902, 0.08073220385683401, 0.29915013029845533, 0.17555203102009337, 0.04187222313183676, -0.23430225476477062, 0.06381484635598358, 0.0024283372170300155]
|
706.3944
|
A new tetra-quark interpretation of X(3872)
|
A new tetra-quark interpretation of X(3872) is presented. In this model,
X(3872) consists of two degenerate tetra-quark mesons, {[cn](cbar nbar) +-
(cn)[cbar nbar]}_{I=0}, and, therefore, it is naturally understood that X(3872)
decays into two different eigenstates of G-parity.
|
hep-ph hep-ex nucl-th
|
a new tetraquark interpretation of x3872 is presented in this model x3872 consists of two degenerate tetraquark mesons cncbar nbar cncbar nbar_i0 and therefore it is naturally understood that x3872 decays into two different eigenstates of gparity
|
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|
[-0.1319083909449332, 0.3087815114242189, -0.11478419782703414, 0.24716638600083946, -0.10135174153701347, -0.225145752692376, 0.08475380211808335, 0.2713591927073567, -0.16055127392139504, -0.12385624729316025, -0.1646429458667305, -0.2471209363464047, -0.051925781347295814, 0.004935384705758598, 0.10736208022846018, 0.12747607413021958, 0.17581281219335163, -0.03330704704036608, 0.021218932500821266, -0.1753303160212989, 0.3710142517298022, -0.15234131979591706, 0.11243981702308006, 0.18860643270754202, -0.021563232136780724, -0.04750178276342066, 0.08250387664884329, -0.15223683022400913, -0.04774372529701556, 0.06600998776197872, 0.2553411556736511, 0.202007783083793, 0.12586888475069666, -0.3252307873986223, -0.08027845180100378, 0.1188634354621172, 0.2837238717166817, 0.09835642476237434, 0.09721632207305554, -0.3965142952853485, 0.15873603996656396, -0.2287555140963591, -0.13454716907375874, -0.13121696275330202, 0.03252039751147523, -0.15496992097948403, -0.31327405046014223, 0.12465476947288741, -0.061740474391947776, 0.002548958530978245, -0.06928522671189379, -0.3511465803774841, -0.029657840783543447, -0.0822513443280888, 0.1076798915369984, 0.09375400129048263, 0.155230118016548, -0.10023966688416241, -0.22941471877343514, 0.4305577142273678, -0.030500960865003222, -0.25385830304859314, 0.131132121252663, -0.08680174787364461, -0.20754794214906938, 0.14038552245234742, 0.10434884709470413, 0.015421484021798652, -0.1862155661699088, 0.06325030803290087, -0.17614343192647486, 0.14815292233491645, 0.04800884598208701, 0.1443679948364768, 0.269019574036493, 0.2410173694986631, -0.08082667165709768, 0.09420170281630229, 0.07751790817607851, -0.13426893834462938, -0.4488860202186248, -0.19710128557156115, -0.16641464314478285, 0.13930787074872675, 0.04474894180662779, -0.0972856929361382, 0.4287041811929906, -0.023669408908223406, 0.30344659155782533, -0.11926229911692002, 0.32177791985518794, 0.0392196654506466, -0.009766558431746328, 0.03048008486203959, 0.29829484824200764, 0.264378595220692, 0.13139563119586775, -0.2925876614856808, -0.030868632102604297, 0.00590358317062697]
|
706.3945
|
Slow light with integrated gain and large pulse delay
|
We demonstrate slow and stored light in Rb vapor with a combination of
desirable features: minimal loss and distortion of the pulse shape, and large
fractional delay (> 10). This behavior is enabled by: (i) a group index that
can be controllably varied during light pulse propagation; and (ii)
controllable gain integrated into the medium to compensate for pulse loss. Any
medium with the above two characteristics should be able to realize similarly
high-performance slow light.
|
physics.optics physics.atom-ph quant-ph
|
we demonstrate slow and stored light in rb vapor with a combination of desirable features minimal loss and distortion of the pulse shape and large fractional delay 10 this behavior is enabled by i a group index that can be controllably varied during light pulse propagation and ii controllable gain integrated into the medium to compensate for pulse loss any medium with the above two characteristics should be able to realize similarly highperformance slow light
|
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|
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|
706.3946
|
Phase diagram for a Bose-Einstein condensate moving in an optical
lattice
|
The stability of superfluid currents in a system of ultracold bosons was
studied using a moving optical lattice. Superfluid currents in a very weak
lattice become unstable when their momentum exceeds 0.5 recoil momentum.
Superfluidity vanishes already for zero momentum as the lattice deep reaches
the Mott insulator(MI) phase transition. We study the phase diagram for the
disappearance of superfluidity as a function of momentum and lattice depth
between these two limits. Our phase boundary extrapolates to the critical
lattice depth for the superfluid-to-MI transition with 2% precision. When a
one-dimensional gas was loaded into a moving optical lattice a sudden
broadening of the transition between stable and unstable phases was observed.
|
cond-mat.other
|
the stability of superfluid currents in a system of ultracold bosons was studied using a moving optical lattice superfluid currents in a very weak lattice become unstable when their momentum exceeds 05 recoil momentum superfluidity vanishes already for zero momentum as the lattice deep reaches the mott insulatormi phase transition we study the phase diagram for the disappearance of superfluidity as a function of momentum and lattice depth between these two limits our phase boundary extrapolates to the critical lattice depth for the superfluidtomi transition with 2 precision when a onedimensional gas was loaded into a moving optical lattice a sudden broadening of the transition between stable and unstable phases was observed
|
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|
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|
706.3947
|
Transient Lunar Phenomena: Regularity and Reality
|
Transient lunar phenomena (TLPs) have been reported for centuries, but their
nature is largely unsettled. A review of TLP reports shows regularities in the
observations; a key question is whether this structure is imposed by human
observer effects, terrestrial atmospheric effects or processes tied to the
lunar surface. I interrogate an extensive TLP catalog to determine if human
factors determine the distribution of TLP reports. I divide the sample
according to variables which should produce varying results if determining
factors involve humans e.g., historical epoch or geographical location of the
observer, not reflecting phenomena tied to the lunar surface. Regardless of how
we split the ample, the results are similar: ~50% of the reports involve crater
Aristarchus nd vicinity, ~16% from Plato, ~6% from other recent, major impacts,
plus a few at Grimaldi. Mare Crisium produces a robust signal for three of five
averages of up to 7% of the reports (however, Crisium is an extended feature).
The consistency in TLP report counts for specific features indicates that >~80%
of reports are consistent with being real (perhaps excepting Crisium). Some
commonly reported sites disappear from the robust averages, including
Alphonsus, Ross D and Gassendi. TLP reports supporting these sites originate
almost entirely after year 1955, when TLPs became more popular targets of
observation and many more (and inexperienced) observers searched for TLPs. In a
companion paper, we compare the spatial distribution of robust TLP sites of
transient outgassing (seen on Apollo and Lunar Prospector). To a high
confidence against the random hypothesis, robust TLP sites and those of lunar
outgassing correlate strongly, further arguing for the reality of TLPs.
[Abstract abridged.]
|
astro-ph
|
transient lunar phenomena tlps have been reported for centuries but their nature is largely unsettled a review of tlp reports shows regularities in the observations a key question is whether this structure is imposed by human observer effects terrestrial atmospheric effects or processes tied to the lunar surface i interrogate an extensive tlp catalog to determine if human factors determine the distribution of tlp reports i divide the sample according to variables which should produce varying results if determining factors involve humans eg historical epoch or geographical location of the observer not reflecting phenomena tied to the lunar surface regardless of how we split the ample the results are similar 50 of the reports involve crater aristarchus nd vicinity 16 from plato 6 from other recent major impacts plus a few at grimaldi mare crisium produces a robust signal for three of five averages of up to 7 of the reports however crisium is an extended feature the consistency in tlp report counts for specific features indicates that 80 of reports are consistent with being real perhaps excepting crisium some commonly reported sites disappear from the robust averages including alphonsus ross d and gassendi tlp reports supporting these sites originate almost entirely after year 1955 when tlps became more popular targets of observation and many more and inexperienced observers searched for tlps in a companion paper we compare the spatial distribution of robust tlp sites of transient outgassing seen on apollo and lunar prospector to a high confidence against the random hypothesis robust tlp sites and those of lunar outgassing correlate strongly further arguing for the reality of tlps abstract abridged
|
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|
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|
706.3948
|
Metal-insulator transition in the two-orbital Hubbard model at
fractional band fillings: Self-energy functional approach
|
We investigate the infinite-dimensional two-orbital Hubbard model at
arbitrary band fillings. By means of the self-energy functional approach, we
discuss the stability of the metallic state in the systems with same and
different bandwidths. It is found that the Mott insulating phases are realized
at commensurate band fillings. Furthermore, it is clarified that the orbital
selective Mott phase with one orbital localized and the other itinerant is
stabilized even at fractional band fillings in the system with different
bandwidths.
|
cond-mat.str-el
|
we investigate the infinitedimensional twoorbital hubbard model at arbitrary band fillings by means of the selfenergy functional approach we discuss the stability of the metallic state in the systems with same and different bandwidths it is found that the mott insulating phases are realized at commensurate band fillings furthermore it is clarified that the orbital selective mott phase with one orbital localized and the other itinerant is stabilized even at fractional band fillings in the system with different bandwidths
|
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|
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|
706.3949
|
Lunar Outgassing, Transient Phenomena and The Return to The Moon, I:
Existing Data
|
Herein the transient lunar phenomena (TLP) report database is subjected to a
discriminating statistical filter robust against sites of spurious reports, and
produces a restricted sample that may be largely reliable. This subset is
highly correlated geographically with the catalog of outgassing events seen by
the Apollo 15, 16 and Lunar Prospector alpha-particle spectrometers for
episodic Rn-222 gas release. Both this robust TLP sample and even the larger,
unfiltered sample are highly correlated with the boundary between mare and
highlands, as are both deep and shallow moonquakes, as well as Po-210, a
long-lived product of Rn-222 decay and a further tracer of outgassing. This
offers another significant correlation relating TLPs and outgassing, and may
tie some of this activity to sagging mare basalt plains (perhaps mascons).
Additionally, low-level but likely significant TLP activity is connected to
recent, major impact craters (while moonquakes are not), which may indicate the
effects of cracks caused by the impacts, or perhaps avalanches, allowing
release of gas. The majority of TLP (and Rn-222) activity, however, is confined
to one site that produced much of the basalt in the Procellarum Terrane, and it
seems plausible that this TLP activity may be tied to residual outgassing from
the formerly largest volcanic ffusion sites from the deep lunar interior. With
the coming in the next few years of robotic spacecraft followed by human
exploration, the study of TLPs and outgassing is both promising and imperiled.
We will have an unprecedented pportunity to study lunar outgassing, but will
also deal with a greater burden of anthropogenic lunar gas than ever produced.
There is a pressing need to study lunar atmosphere and its sources while still
pristine. [Abstract abridged.]
|
astro-ph
|
herein the transient lunar phenomena tlp report database is subjected to a discriminating statistical filter robust against sites of spurious reports and produces a restricted sample that may be largely reliable this subset is highly correlated geographically with the catalog of outgassing events seen by the apollo 15 16 and lunar prospector alphaparticle spectrometers for episodic rn222 gas release both this robust tlp sample and even the larger unfiltered sample are highly correlated with the boundary between mare and highlands as are both deep and shallow moonquakes as well as po210 a longlived product of rn222 decay and a further tracer of outgassing this offers another significant correlation relating tlps and outgassing and may tie some of this activity to sagging mare basalt plains perhaps mascons additionally lowlevel but likely significant tlp activity is connected to recent major impact craters while moonquakes are not which may indicate the effects of cracks caused by the impacts or perhaps avalanches allowing release of gas the majority of tlp and rn222 activity however is confined to one site that produced much of the basalt in the procellarum terrane and it seems plausible that this tlp activity may be tied to residual outgassing from the formerly largest volcanic ffusion sites from the deep lunar interior with the coming in the next few years of robotic spacecraft followed by human exploration the study of tlps and outgassing is both promising and imperiled we will have an unprecedented pportunity to study lunar outgassing but will also deal with a greater burden of anthropogenic lunar gas than ever produced there is a pressing need to study lunar atmosphere and its sources while still pristine abstract abridged
|
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|
[-0.05697864740402914, 0.18861303740079272, -0.054180178841419624, 0.07066672392139367, -0.06958861134472187, -0.09402084329342265, 0.05669221915597823, 0.3791997425638846, -0.22190837514413397, -0.35183051645663993, 0.1451156389250345, -0.32133271970724975, -0.11658236021889767, 0.21409245780720138, -0.11698184119551068, -0.004430503235995195, 0.10723516161988632, -0.033404059427277095, -0.002479456742396102, -0.22543246594910257, 0.22784501259524484, 0.1502779224310937, 0.19918952544515503, 0.06601812175719789, 0.0491523061567547, -0.09033497507016032, -0.0776794339244655, -0.014214748943251742, -0.08522386592257845, 0.12097324545584011, 0.24651832812734248, 0.12815741730350866, 0.2527715602369612, -0.44967956197523806, -0.22188282225461148, 0.10904751989368458, 0.12272888868809236, 0.0652663926823391, -0.08213340639252298, -0.29298382420024843, 0.04270262496518719, -0.19547584234485335, -0.1109308458840896, -0.015348639539748866, 0.07440569671210799, 0.012735975168672574, -0.22313148652400522, 0.08029409904314637, 0.04447445934587396, 0.1070753252983474, -0.09131003478431503, -0.12249307699601784, -0.04386474861020739, 0.12378525232512123, 0.09068585052214441, 0.05946527398488804, 0.18324769329599166, -0.1091866771340611, -0.03437076983667475, 0.3994534977195091, -0.03524928860627429, -0.0476895530748922, 0.2733859745254502, -0.19296956111092364, -0.13421575056327792, 0.1937825185158392, 0.17632826773388596, 0.068076625294273, -0.17636202894708644, -0.05411541889643426, -0.01749491124935652, 0.18637443649290253, 0.05808382039319513, 0.023201108949231733, 0.28515365146832156, 0.1922421795757909, 0.07488543746982748, 0.12120558743354062, -0.17709345713149022, -0.04056467539987724, -0.19626159579951968, -0.12655364379820408, -0.11863682328138746, 0.06104109502219243, -0.03694830538404818, -0.14214412481876695, 0.3373427397811983, 0.1446087208906202, 0.1477396824124378, -0.010740169143409597, 0.29647334430699857, 0.00850299509754362, 0.10758383413368877, 0.06659122442666876, 0.272122419239247, 0.049449764537951316, 0.1015025945669244, -0.18185948715868142, 0.16742368761567317, -0.03495124745672147]
|
706.395
|
Thorn independence in the field of real numbers with a small
multiplicative group
|
We characterize thorn-independence in a variety of structures, focusing on
the field of real numbers expanded by predicate defining a dense multiplicative
subgroup, G, satisfying the Mann property and whose pth powers are of finite
index in G. We also show such structures are super-rosy and eliminate
imaginaries up to codes for small sets.
|
math.LO
|
we characterize thornindependence in a variety of structures focusing on the field of real numbers expanded by predicate defining a dense multiplicative subgroup g satisfying the mann property and whose pth powers are of finite index in g we also show such structures are superrosy and eliminate imaginaries up to codes for small sets
|
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|
[-0.20631412844415065, 0.1290366658595977, -0.03919640345567906, 0.05160263908544072, -0.08896900230104586, -0.06941956868697027, 0.0228599169209634, 0.37701656317545307, -0.34178506641614215, -0.26559911895094923, 0.09844385857987045, -0.23004095011425238, -0.13487263496413274, 0.22266927463243957, -0.09536261621138288, 0.01752827526932513, -0.006536148091847146, 0.09996409096789581, -0.06056475473774804, -0.2680838323646673, 0.38798455949182864, -0.03774786495638115, 0.21085116860491257, 0.013799322294761185, 0.09998300009303623, -0.040205790419821384, -0.048240064151792064, 0.07593450245999352, -0.10754021123931226, 0.10036220648153513, 0.23149255561400894, 0.11570327522026168, 0.2522611965735753, -0.3572927737367098, -0.173021392017189, 0.17065944648520262, 0.0753787239211508, 0.007860195840260497, -0.03221874336789673, -0.2426833871200129, 0.23549808717022339, -0.18467337151782381, -0.11930580811437082, -0.12688924732652526, 0.07752002597381188, 0.07931363404969927, -0.29448235345383483, -0.02702057210316761, 0.08562373545848662, 0.13270542199757915, -0.002379490666229416, -0.12583462852570745, 0.010656452823982195, 0.06300043632034902, -0.05842102187927122, -0.015807453077286482, 0.0649308305475171, -0.11503409152350354, -0.10186539265473753, 0.39049826176078234, -0.06695677750502471, -0.19429100088395732, 0.12633590513184942, -0.16429611037623276, -0.16619773500564475, 0.12836182524484616, 0.15551038603815767, 0.13571127811101852, -0.01384685281664133, 0.19258125279642022, -0.08025784555960584, 0.10786050126060015, 0.15768066591893634, 0.05240307020506373, 0.12693647998902532, 0.06058396884947325, 0.056238496167309304, 0.1606833581484992, 0.027095987138131425, 0.022367905118261224, -0.3247197140008211, -0.14044197441803086, -0.14093624062284274, 0.08405536358003263, -0.12820318154074442, -0.22840119798288303, 0.3648302839310081, 0.07750193181413191, 0.16420833545702476, 0.08716151954744149, 0.19413342218871954, 0.06919132264468957, 0.09192645084975218, 0.11054050905147085, 0.08613124082761782, 0.22927384078933824, -0.07742372125870099, -0.14160249278777176, -0.0020897143986076117, 0.12859892050080277]
|
706.3951
|
Extending SU(2) to SU(N) QCD
|
Abelian dominance is used to reformulate the QCD Lagrangian as a sum over the
roots of Lie group representation theory. This greatly facilitates extending
the SU(2) magnetic ground state energy spectrum, several arguments for the
stability of the magnetic ground state, and the Faddeev-Skyrme model to
arbitrary SU(N) QCD.
|
hep-th
|
abelian dominance is used to reformulate the qcd lagrangian as a sum over the roots of lie group representation theory this greatly facilitates extending the su2 magnetic ground state energy spectrum several arguments for the stability of the magnetic ground state and the faddeevskyrme model to arbitrary sun qcd
|
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|
[-0.1642021759679275, 0.16563777484912046, -0.10772849279081649, 0.10149971848087651, -0.12161652192625465, -0.0252473944018842, 0.05208651387674392, 0.30457833243001786, -0.2509960119365429, -0.277161786902924, 0.08923861646682632, -0.20799946060822327, -0.06256296853439844, 0.0887699426218335, 0.04697776329228465, 0.03731740430491615, 0.0070018324126698535, 0.13764723798507178, -0.10108073921018869, -0.21190919867735736, 0.3067279843832081, 0.00658546753075658, 0.27765149014944934, 0.07754273224165853, 0.08365875438844063, 0.05894102980572807, 0.04368642134097766, -0.023483495170972785, -0.06666826629745108, 0.12500412026610302, 0.2508432127307264, 0.04365323518155789, 0.16589579244657437, -0.401865360783223, -0.25136553304155873, 0.13150156127783108, 0.1509420857289616, 0.10461552076193752, 0.041165046431884476, -0.3284741889552346, 0.0644620918165132, -0.24974731518886983, -0.1973662916570902, -0.12516761168229337, -0.06226259625839944, -0.05725409345207166, -0.26724608485796014, 0.03148087144506221, 0.006021805478221908, 0.07536301788474832, -0.13960064245193093, -0.15453940752551568, -0.05624173532183073, 0.09111540661934688, 0.07575133615125883, 0.0958187525559749, 0.12133302737255486, -0.18983571573008537, -0.15609913961771799, 0.4266610691437916, -0.0451542927446414, -0.17282321110215723, 0.1356646635436586, -0.11715359257876265, -0.11543770831990607, 0.16138990811899076, 0.0863967955169477, 0.11439422613047824, -0.055677588800994715, 0.16767393126584856, -0.08988278138698363, 0.1330980447035435, 0.003426194647137, 0.019863769678132876, 0.1964923159922568, 0.1125983181124439, 0.059249928154583485, 0.12407896378818824, -0.023346700254181514, -0.16369110615733934, -0.3319434300825304, -0.12720891475031265, -0.1646245009626965, 0.09462898495911183, -0.10070128187659548, -0.16573597763531975, 0.43997074804287784, 0.14119891018359637, 0.14238013909673508, 0.06813065764703313, 0.2854527494661054, 0.10905857401073207, 0.019872795191726515, 0.03104468803338728, 0.22347289647393842, 0.2826919271800743, 0.06813081456300783, -0.2663229505759569, -0.08554053848742374, 0.20941846557341667]
|
706.3952
|
Lunar Outgassing, Transient Phenomena and The Return to The Moon, II:
Predictions for Interactions between Outgassing and Regolith
|
We consider the implications from Paper I on how gas leaking through the
lunar surface might interact with the regolith, and in what respects this might
affect or cause the appearance of optical Transient Lunar Phenomena (TLPs). We
consider briefly a range of phenomena, but concentrate at the extremes of high
and low gas flow rate, which might represent the more likely behaviors.
Extremely fast i.e., explosive, expulsion of gas from the surface is
investigated by examining the minimal amount of gas needed to displace a plug
of regolith above a site of gaseous overpressure at the regolith's base. The
area and timescale of this disturbance, it is consistent with observed TLPs.
Furthermore there are several ways in which such an explosion might be expected
to change the lunar surface appearance in a way consistent with many TLPs,
including production of obscuration, brightening and color changes. At the slow
end of the volatile flow range, gas seeping from the interior is retained below
the surface for extensive times due to the low diffusivity of regolith
material. A special circumstance arises if the volatile flow contains water
vapor, because water is uniquely capable of freezing as it passes from the base
to the surface of the regolith. For a large TLP site, it is plausible to think
of areas on the square-km scale accumulating significant bodies of water ice.
Furthermore, as the system evolves over geological time, the ice accumulation
zone will evolve downwards into the regolith. Since many reactions possible
between the volatiles and regolith, depending on the additional gases besides
water, can act to decrease diffusivity in the regolith, it is plausible that
the volatiles produce a barrier between the seepage source and vacuum, forcing
the ice zone to expand to larger areas.
|
astro-ph
|
we consider the implications from paper i on how gas leaking through the lunar surface might interact with the regolith and in what respects this might affect or cause the appearance of optical transient lunar phenomena tlps we consider briefly a range of phenomena but concentrate at the extremes of high and low gas flow rate which might represent the more likely behaviors extremely fast ie explosive expulsion of gas from the surface is investigated by examining the minimal amount of gas needed to displace a plug of regolith above a site of gaseous overpressure at the regoliths base the area and timescale of this disturbance it is consistent with observed tlps furthermore there are several ways in which such an explosion might be expected to change the lunar surface appearance in a way consistent with many tlps including production of obscuration brightening and color changes at the slow end of the volatile flow range gas seeping from the interior is retained below the surface for extensive times due to the low diffusivity of regolith material a special circumstance arises if the volatile flow contains water vapor because water is uniquely capable of freezing as it passes from the base to the surface of the regolith for a large tlp site it is plausible to think of areas on the squarekm scale accumulating significant bodies of water ice furthermore as the system evolves over geological time the ice accumulation zone will evolve downwards into the regolith since many reactions possible between the volatiles and regolith depending on the additional gases besides water can act to decrease diffusivity in the regolith it is plausible that the volatiles produce a barrier between the seepage source and vacuum forcing the ice zone to expand to larger areas
|
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|
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|
706.3953
|
Maps between moduli spaces of vector bundles and the base locus of the
theta divisor
|
Given a vector bundle $E$ of rank $r$ and degree $d$ on a curve $C$ of genus
$g$, one can associate to $E$ in a natural way several other vector bundles.
For example, one can take wedge powers of $E$. If $E$ is generated by global
sections, the kernel of the evaluation map of sections is again a vector
bundle. Also, new vector bundles can be produced by taking elementary
transformations centered at a fixed point. Under suitable conditions on degree
and rank, these constructions can be carried out globally. While all this
processes seem quite elementary, very little is known about the resulting maps.
The purpose of this paper is to fill in this gap.
|
math.AG
|
given a vector bundle e of rank r and degree d on a curve c of genus g one can associate to e in a natural way several other vector bundles for example one can take wedge powers of e if e is generated by global sections the kernel of the evaluation map of sections is again a vector bundle also new vector bundles can be produced by taking elementary transformations centered at a fixed point under suitable conditions on degree and rank these constructions can be carried out globally while all this processes seem quite elementary very little is known about the resulting maps the purpose of this paper is to fill in this gap
|
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|
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|
706.3954
|
Lunar Outgassing, Transient Phenomena and The Return to The Moon, III:
Observational and Experimental Techniques
|
In Papers II and III we show that Transient Lunar Phenomena (TLPs) are likely
related to lunar outgassing, albeit in ways not fully understood. Here we
propose a path forward, in which current and forthcoming technologies provide a
more controlled, sensitive probe of lunar outgassing. Many of these techniques
are being realized for the first time. Given the optical transient/outgassing
connection, progress can be made by remote sensing, and we suggest programs of
imaging, spectroscopy and combinations thereof. However, as found in Paper II,
many aspects of lunar outgassing seem covert in nature. TLPs betray outgassing,
but not all outgassing produces TLPs. Some outgassing may never appear at the
surface, but remain trapped in the regolith. We also suggest more intrusive
techniques, from radar mapping to in-situ probes. Understanding these volatiles
seems promising in terms of a resource for humans on the Moon and beyond, and
offers an interesting scientific goal in its own right. Hence this paper is a
series of proposed techniques, some in practice, some which might be soon, and
some requiring significant future investment, some of which may prove unwise
pending results from predecessor investigations. These point towards
enhancement of our knowledge of lunar outgassing, its relation to other lunar
processes, and an increase in our understanding of how volatiles are involved
in the evolution of the Moon. We emphasize certain ground-based observations in
time for flights of SELENE, LRO and other robotic missions, and others before
extensive human xploration. We discuss how study of the pristine lunar
atmosphere pertains to understanding the role of anthropogenic volatiles, an
important confusing signal
|
astro-ph
|
in papers ii and iii we show that transient lunar phenomena tlps are likely related to lunar outgassing albeit in ways not fully understood here we propose a path forward in which current and forthcoming technologies provide a more controlled sensitive probe of lunar outgassing many of these techniques are being realized for the first time given the optical transientoutgassing connection progress can be made by remote sensing and we suggest programs of imaging spectroscopy and combinations thereof however as found in paper ii many aspects of lunar outgassing seem covert in nature tlps betray outgassing but not all outgassing produces tlps some outgassing may never appear at the surface but remain trapped in the regolith we also suggest more intrusive techniques from radar mapping to insitu probes understanding these volatiles seems promising in terms of a resource for humans on the moon and beyond and offers an interesting scientific goal in its own right hence this paper is a series of proposed techniques some in practice some which might be soon and some requiring significant future investment some of which may prove unwise pending results from predecessor investigations these point towards enhancement of our knowledge of lunar outgassing its relation to other lunar processes and an increase in our understanding of how volatiles are involved in the evolution of the moon we emphasize certain groundbased observations in time for flights of selene lro and other robotic missions and others before extensive human xploration we discuss how study of the pristine lunar atmosphere pertains to understanding the role of anthropogenic volatiles an important confusing signal
|
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|
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|
706.3955
|
Study of charmonia in four-meson final states produced in two-photon
collisions
|
We report measurements of charmonia produced in two-photon collisions and
decaying to four-meson final states, where the meson is either a charged pion
or a charged kaon. The analysis is based on a 395fb^{-1} data sample
accumulated with the Belle detector at the KEKB electron-positron collider. We
observe signals for the three C-even charmonia eta_c(1S), chi_{c0}(1P) and
chi_{c2}(1P) in the pi^+pi^-pi^+pi^-, K^+K^-pi^+pi^- and K^+K^-K^+K^- decay
modes. No clear signals for eta_c(2S) production are found in these decay
modes. We have also studied resonant structures in charmonium decays to
two-body intermediate meson resonances. We report the products of the
two-photon decay width and the branching fractions, Gamma_{gamma gamma}B, for
each of the charmonium decay modes.
|
hep-ex
|
we report measurements of charmonia produced in twophoton collisions and decaying to fourmeson final states where the meson is either a charged pion or a charged kaon the analysis is based on a 395fb1 data sample accumulated with the belle detector at the kekb electronpositron collider we observe signals for the three ceven charmonia eta_c1s chi_c01p and chi_c21p in the pipipipi kkpipi and kkkk decay modes no clear signals for eta_c2s production are found in these decay modes we have also studied resonant structures in charmonium decays to twobody intermediate meson resonances we report the products of the twophoton decay width and the branching fractions gamma_gamma gammab for each of the charmonium decay modes
|
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|
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|
706.3956
|
Long-time tails in freely cooling granular gases
|
The long-time behavior of the current auto-correlation functions for the
velocity, the shear stress and the heat flux is investigated in freely cooling
granular gases. It is found that the correlation functions for the velocity and
the shear stress have the long-time tails obeying $\tau^{-d/2}$, while the
correlation function of heat flux decays as $\tau^{-(d+2)/2} \exp(-\zeta^*
\tau)$ with the dimensionless cooling rate $\zeta^*$, the spatial dimension $d$
and the scaled time $\tau$ in terms of the collision frequency. The result of
our numerical simulation of the freely cooling granular gases is consistent
with the theoretical prediction.
|
cond-mat.stat-mech cond-mat.soft
|
the longtime behavior of the current autocorrelation functions for the velocity the shear stress and the heat flux is investigated in freely cooling granular gases it is found that the correlation functions for the velocity and the shear stress have the longtime tails obeying taud2 while the correlation function of heat flux decays as taud22 expzeta tau with the dimensionless cooling rate zeta the spatial dimension d and the scaled time tau in terms of the collision frequency the result of our numerical simulation of the freely cooling granular gases is consistent with the theoretical prediction
|
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|
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|
706.3957
|
Notes on $\pi_1$ of Smooth Loci of Log Del Pezzo Surfaces
|
It is known that the fundamental groups of smooth loci of Log del Pezzo
Surfaces are finite groups. The aim of this note is to study these finite
groups. A short table containing these groups is given. And lots of groups on
the table are proved to be fundamental groups.
|
math.AG
|
it is known that the fundamental groups of smooth loci of log del pezzo surfaces are finite groups the aim of this note is to study these finite groups a short table containing these groups is given and lots of groups on the table are proved to be fundamental groups
|
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|
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|
706.3958
|
Di-jet hadron pair correlation in a hydrodynamical model with a
quenching jet
|
In jet quenching, a hard QCD parton, before fragmenting into a jet of
hadrons, deposits a fraction of its energy in the medium, leading to suppressed
production of high-$p_T$ hadrons. Assuming that the deposited energy quickly
thermalizes, we simulate the subsequent hydrodynamic evolution of the QGP
fluid. Hydrodynamic evolution and subsequent particle emission depend on the
jet trajectories. Azimuthal distribution of excess $\pi^-$ due to quenching
jet, averaged over all the trajectories, reasonably well reproduce the
di-hadron correlation as measured by the STAR and PHENIX collaboration in
central and in peripheral Au+Au collisions.
|
nucl-th
|
in jet quenching a hard qcd parton before fragmenting into a jet of hadrons deposits a fraction of its energy in the medium leading to suppressed production of highp_t hadrons assuming that the deposited energy quickly thermalizes we simulate the subsequent hydrodynamic evolution of the qgp fluid hydrodynamic evolution and subsequent particle emission depend on the jet trajectories azimuthal distribution of excess pi due to quenching jet averaged over all the trajectories reasonably well reproduce the dihadron correlation as measured by the star and phenix collaboration in central and in peripheral auau collisions
|
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|
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|
706.3959
|
Self-Similar Dynamics of a Magnetized Polytropic Gas
|
In broad astrophysical contexts of large-scale gravitational collapses and
outflows and as a basis for various further astrophysical applications, we
formulate and investigate a theoretical problem of self-similar MHD for a
non-rotating polytropic gas of quasi-spherical symmetry permeated by a
completely random magnetic field. We derive two coupled nonlinear MHD ordinary
differential equations (ODEs), examine properties of the magnetosonic critical
curve, obtain various asymptotic and global semi-complete similarity MHD
solutions, and qualify the applicability of our results. Unique to a magnetized
gas cloud, a novel asymptotic MHD solution for a collapsing core is
established. Physically, the similarity MHD inflow towards the central dense
core proceeds in characteristic manners before the gas material eventually
encounters a strong radiating MHD shock upon impact onto the central compact
object. Sufficiently far away from the central core region enshrouded by such
an MHD shock, we derive regular asymptotic behaviours. We study asymptotic
solution behaviours in the vicinity of the magnetosonic critical curve.
Numerically, we construct global semi-complete similarity MHD solutions that
cross the magnetosonic critical curve zero, one, and two times. For comparison,
counterpart solutions in the case of an isothermal unmagnetized and magnetized
gas flows are demonstrated in the present MHD framework at nearly isothermal
and weakly magnetized conditions. For a polytropic index $\gamma=1.25$ or a
strong magnetic field, different solution behaviours emerge. In these cases,
there exist semi-complete similarity solutions crossing the magnetosonic
critical curve only once, and the MHD counterpart of expansion-wave collapse
solution disappears.
|
astro-ph
|
in broad astrophysical contexts of largescale gravitational collapses and outflows and as a basis for various further astrophysical applications we formulate and investigate a theoretical problem of selfsimilar mhd for a nonrotating polytropic gas of quasispherical symmetry permeated by a completely random magnetic field we derive two coupled nonlinear mhd ordinary differential equations odes examine properties of the magnetosonic critical curve obtain various asymptotic and global semicomplete similarity mhd solutions and qualify the applicability of our results unique to a magnetized gas cloud a novel asymptotic mhd solution for a collapsing core is established physically the similarity mhd inflow towards the central dense core proceeds in characteristic manners before the gas material eventually encounters a strong radiating mhd shock upon impact onto the central compact object sufficiently far away from the central core region enshrouded by such an mhd shock we derive regular asymptotic behaviours we study asymptotic solution behaviours in the vicinity of the magnetosonic critical curve numerically we construct global semicomplete similarity mhd solutions that cross the magnetosonic critical curve zero one and two times for comparison counterpart solutions in the case of an isothermal unmagnetized and magnetized gas flows are demonstrated in the present mhd framework at nearly isothermal and weakly magnetized conditions for a polytropic index gamma125 or a strong magnetic field different solution behaviours emerge in these cases there exist semicomplete similarity solutions crossing the magnetosonic critical curve only once and the mhd counterpart of expansionwave collapse solution disappears
|
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|
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|
706.396
|
Kaluza-Klein Gluons as a Diagnostic of Warped Models
|
We study the properties of $g^{1}$, the first excited state of the gluon in
representative variants of the Randall Sundrum model with the Standard Model
fields in the bulk. We find that measurements of the coupling to light quarks
(from the inclusive cross-section for $pp\to g^{1} \to t\bar t$), the coupling
to bottom quarks (from the rate of $pp\to g^{1} b$), as well as the overall
width, can provide powerful discriminants between the models. In models with
large brane kinetic terms, the $g^1$ resonance can even potentially be
discovered decaying into dijets against the large QCD background. We also
derive bounds based on existing Tevatron searches for resonant $t \bar{t}$
production and find that they require $M_{g^{1}} \gtrsim 950$ GeV. In addition
we explore the pattern of interference between the $g^1$ signal and the
non-resonant SM background, defining an asymmetry parameter for the invariant
mass distribution. The interference probes the relative signs of the couplings
of the $g^{1}$ to light quark pairs and to $t\bar t$, and thus provides an
indication that the top is localized on the other side of the extra dimension
from the light quarks, as is typical in the RS framework.
|
hep-ph
|
we study the properties of g1 the first excited state of the gluon in representative variants of the randall sundrum model with the standard model fields in the bulk we find that measurements of the coupling to light quarks from the inclusive crosssection for ppto g1 to tbar t the coupling to bottom quarks from the rate of ppto g1 b as well as the overall width can provide powerful discriminants between the models in models with large brane kinetic terms the g1 resonance can even potentially be discovered decaying into dijets against the large qcd background we also derive bounds based on existing tevatron searches for resonant t bart production and find that they require m_g1 gtrsim 950 gev in addition we explore the pattern of interference between the g1 signal and the nonresonant sm background defining an asymmetry parameter for the invariant mass distribution the interference probes the relative signs of the couplings of the g1 to light quark pairs and to tbar t and thus provides an indication that the top is localized on the other side of the extra dimension from the light quarks as is typical in the rs framework
|
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|
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|
706.3961
|
Extra dimensions and atomic transition frequencies
|
New unification theories predict Large Extra Dimensions (LEDs). If that is
the case, gravity would be stronger at short ranges than what Newtonian gravity
predicts. LEDs could also have effects at atomic level. In this paper we
propose a new method to constrain the size of gravity-only LEDs by analyzing
how these LEDs modify the energy of the atomic transitions 1s-2s and 2s-2p
(Lamb shift), for the particular case of the hydrogen and muonium atoms. We
estimate these effects by using Bethe's non-relativistic treatment of Lamb
shift. For the particular case of three LEDs, which may be a candidate to
explain the interaction mechanism of dark matter particles, we have found that
current knowledge in atomic spectroscopy could constrain their sizes to be less
than 10 * 10^(-6) m. Although our contributions do not reach the sensitivity
given by SN1987a, they are still slightly better than recent constraints given
by Inverse Square Law tests of Eot-Wash group at Washington University, which
gave R3 < 36.6 * 10^(-6) m.
|
gr-qc
|
new unification theories predict large extra dimensions leds if that is the case gravity would be stronger at short ranges than what newtonian gravity predicts leds could also have effects at atomic level in this paper we propose a new method to constrain the size of gravityonly leds by analyzing how these leds modify the energy of the atomic transitions 1s2s and 2s2p lamb shift for the particular case of the hydrogen and muonium atoms we estimate these effects by using bethes nonrelativistic treatment of lamb shift for the particular case of three leds which may be a candidate to explain the interaction mechanism of dark matter particles we have found that current knowledge in atomic spectroscopy could constrain their sizes to be less than 10 106 m although our contributions do not reach the sensitivity given by sn1987a they are still slightly better than recent constraints given by inverse square law tests of eotwash group at washington university which gave r3 366 106 m
|
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|
[-0.05566154659697504, 0.20213655508264447, -0.04810037637750308, 0.09823433867034813, -0.061666707180891976, -0.16886448102128326, 0.06942124010670478, 0.3493838518745068, -0.18121993220340687, -0.3722715955848495, 0.046560855298726396, -0.2724097253274963, -0.06804262284986731, 0.18745842991241565, -0.050539731561686056, -0.027531615577666372, 0.020503355540109403, -0.013607755886870578, -0.0610113534067447, -0.2484476693397896, 0.2677261543939963, 0.08603160374261665, 0.23849318909430595, 0.05940497231010037, 0.0261540118731897, -0.053865982322586756, -0.002758945987531633, -0.009303415205442544, -0.14199947490203407, 0.08361033027829376, 0.21467372150139205, 0.07669582161487955, 0.2246174886977921, -0.43932745089246467, -0.22446334492838518, 0.12430633369438124, 0.1549975456613483, 0.12441474751456442, -0.03784553870615182, -0.2761856665863006, 0.07811320751630278, -0.17750050763910016, -0.12747059774895508, -0.04109289543985417, 0.04576572360696666, -0.015464195146959162, -0.24183732826319157, 0.05130444042592761, 0.001062860924073241, 0.024345930064605042, -0.041926076257544936, -0.15626460505353118, 0.02575196965569348, 0.07021308150706869, 0.023250248064428117, 0.02455448058634912, 0.17165210992763716, -0.11088047328292194, -0.08166029114332614, 0.43125251805459175, -0.09739737362401546, -0.13903791819219335, 0.16377769767334968, -0.20829198374836283, -0.13203670997454814, 0.1223445551469922, 0.14100365218226657, 0.09956455089149213, -0.14217160231941803, 0.06323126746186365, -0.022404549155864074, 0.19836277341413677, 0.11988513893588926, 0.07968943498351357, 0.23837954206568557, 0.11796064727205896, 0.028294789044638023, 0.053574247966576935, -0.11360066426409916, -0.024968011420445912, -0.273757497452651, -0.11929735471635605, -0.1333163538016379, 0.08764565867613507, -0.0633749419539306, -0.08416673977379546, 0.33057435094731663, 0.17408444874172072, 0.15421999882409265, 0.03166543884964829, 0.280898681601199, 0.11447853381449187, 0.0906088671181351, 0.013918006321358862, 0.31088553532450036, 0.10572447781309938, 0.08405029794878581, -0.22986087138256567, 0.03994189824654975, 0.026141318825609758]
|
706.3962
|
Quantum measurement, detection and locality
|
According to Bell's theorem, local realism is incompatible with quantum
theory. However, it depends on an implied assumption about quantum measurement.
We suggest that the assumption might be removed by a detailed quantum analysis
of the interaction between the measured system and measuring apparatus using
Born's statistical interpretation. But it is conceivable that detailed analysis
of all possible Bell experiments would allow the compatibility of quantum
theory and local realism. The difficulties of theory and experiment are closely
related.
|
quant-ph
|
according to bells theorem local realism is incompatible with quantum theory however it depends on an implied assumption about quantum measurement we suggest that the assumption might be removed by a detailed quantum analysis of the interaction between the measured system and measuring apparatus using borns statistical interpretation but it is conceivable that detailed analysis of all possible bell experiments would allow the compatibility of quantum theory and local realism the difficulties of theory and experiment are closely related
|
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|
[-0.08491716685091864, 0.11784533246975139, -0.1602168060687026, 0.1011769039279345, -0.07669525570530869, -0.19356828755286487, 0.06159694158159715, 0.2933001469915049, -0.2476466815189062, -0.3449180598453253, 0.05833360940052927, -0.27854115761156323, -0.1515170763588593, 0.2086252702659444, -0.05582177747170665, 0.08662627671574112, 0.08542199426808077, 0.037737386436732134, -0.07204195627238295, -0.2224559721336523, 0.3128871700985805, 0.10755949094302103, 0.32207560378916655, 0.0841873107312978, 0.09375217272546378, 0.04109767178085314, -0.06673967647307281, 0.05808541161821244, -0.09860709251904465, 0.11566583380763289, 0.19251159307196195, 0.21348139664889138, 0.2466371827935682, -0.4768730768391603, -0.17560598980399628, 0.08741129302903067, 0.036442491443992794, 0.13117604598968843, 0.007954500519812013, -0.3289460451636888, 0.05376484021883387, -0.11426014062960314, -0.15587093239602975, -0.1104956338700803, -0.036697222084938724, -0.03825706484745245, -0.2168108371051052, 0.14464633999380602, 0.08897462665233054, 0.09959313101901472, -0.02265176167888449, -0.03151843511010225, 0.05223462243175393, 0.07041881989121815, 0.021639102458352624, -0.008005771644507782, 0.1811325660482332, -0.09097326309950668, -0.15086844964306564, 0.3852592236067675, -0.0009831239386827132, -0.18064012643114863, 0.20121589213421073, -0.15755497698400972, -0.15541279627764715, 0.020225414204635198, 0.014417398567724077, 0.045071046587221233, -0.14707339921659685, 0.05063845149810202, -0.07141845306982816, 0.22705105696863767, 0.05464766661141398, 0.09372452149002612, 0.2545081003085722, 0.10406484775970207, 0.03367124087047539, 0.048466837667282436, -0.010702902955132761, -0.18212637895367498, -0.39967506841013706, -0.1748088126341942, -0.2267098908527766, 0.12342784611531828, -0.05648042766699314, -0.08388080600578385, 0.3051824691919816, 0.19735443815471063, 0.13362891448638106, -0.014520852873691275, 0.26083160955694656, 0.11804800994084158, 0.06007691530534361, -0.02318242096483613, 0.303676752727243, 0.20384969923326957, 0.04398345455079328, -0.21230137029285484, 0.13364302578803647, -0.0035030673629356714]
|
706.3963
|
Carbonates in space - The challenge of low temperature data
|
Carbonates have repeatedly been discussed as possible carriers of stardust
emission bands. However, the band assignments proposed so far were mainly based
on room temperature powder transmission spectra of the respective minerals.
Since very cold calcite grains have been claimed to be present in protostars
and in Planetary Nebulae such as NGC 6302, the changes of their dielectric
functions at low temperatures are relevant from an astronomical point of view.
We have derived the IR optical constants of calcite and dolomite from
reflectance spectra - measured at 300, 200, 100 and 10K - and calculated small
particle spectra for different grain shapes, with the following results: i) The
absorption efficiency factors both of calcite and dolomite are extremely
dependent on the particle shapes. This is due to the high peak values of the
optical constants of CaCO3 and CaMg[CO3]2. ii) The far infrared properties of
calcite and dolomite depend also very significantly on the temperature. Below
200K, a pronounced sharpening and increase in the band strengths of the FIR
resonances occurs. iii) In view of the intrinsic strength and sharpening of the
44 mum band of calcite at 200-100K, the absence of this band -- inferred from
Infrared Space Observatory data -- in PNe requires dust temperatures below 45K.
iv) Calcite grains at such low temperatures can account for the '92' mum band,
while our data rule out dolomite as the carrier of the 60-65 mum band. The
optical constants here presented are publicly available in the electronic
database http://www.astro.uni-jena.de/Laboratory/OCDB
|
astro-ph
|
carbonates have repeatedly been discussed as possible carriers of stardust emission bands however the band assignments proposed so far were mainly based on room temperature powder transmission spectra of the respective minerals since very cold calcite grains have been claimed to be present in protostars and in planetary nebulae such as ngc 6302 the changes of their dielectric functions at low temperatures are relevant from an astronomical point of view we have derived the ir optical constants of calcite and dolomite from reflectance spectra measured at 300 200 100 and 10k and calculated small particle spectra for different grain shapes with the following results i the absorption efficiency factors both of calcite and dolomite are extremely dependent on the particle shapes this is due to the high peak values of the optical constants of caco3 and camgco32 ii the far infrared properties of calcite and dolomite depend also very significantly on the temperature below 200k a pronounced sharpening and increase in the band strengths of the fir resonances occurs iii in view of the intrinsic strength and sharpening of the 44 mum band of calcite at 200100k the absence of this band inferred from infrared space observatory data in pne requires dust temperatures below 45k iv calcite grains at such low temperatures can account for the 92 mum band while our data rule out dolomite as the carrier of the 6065 mum band the optical constants here presented are publicly available in the electronic database httpwwwastrounijenadelaboratoryocdb
|
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|
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|
706.3964
|
Coxeter polytopes with a unique pair of non-intersecting facets
|
We consider compact hyperbolic Coxeter polytopes whose Coxeter diagram
contains a unique dotted edge. We prove that such a polytope in d-dimensional
hyperbolic space has at most d+3 facets. In view of results of Lann\'er,
Kaplinskaja, Esselmann, and the second author, this implies that compact
hyperbolic Coxeter polytopes with a unique pair of non-intersecting facets are
completely classified. They do exist only up to dimension 6 and in dimension 8.
|
math.MG math.CO math.GR
|
we consider compact hyperbolic coxeter polytopes whose coxeter diagram contains a unique dotted edge we prove that such a polytope in ddimensional hyperbolic space has at most d3 facets in view of results of lanner kaplinskaja esselmann and the second author this implies that compact hyperbolic coxeter polytopes with a unique pair of nonintersecting facets are completely classified they do exist only up to dimension 6 and in dimension 8
|
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|
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|
706.3965
|
Unambiguous symmetry assignment for the top valence band of ZnO by
magneto-optical studies of the free A-exciton state
|
We studied the circular polarization and angular dependences of the
magneto-photoluminescence spectra of the free A-exciton 1S state in wurtzite
ZnO at T = 5 K. The circular polarization properties of the spectra clearly
indicate that the top valence band has Gamma_7 symmetry. The out-of-plane
component of the magnetic field, which is parallel to the sample's c axis,
leads to linear Zeeman splitting of both the dipole-allowed Gamma_5 exciton
state and the weakly allowed Gamma_1/Gamma_2 exciton states. The in-plane
field, which is perpendicular to the c axis, increases the oscillator strength
of the weak Gamma_1/Gamma_2 states by forming a mixed exciton state.
|
cond-mat.mtrl-sci
|
we studied the circular polarization and angular dependences of the magnetophotoluminescence spectra of the free aexciton 1s state in wurtzite zno at t 5 k the circular polarization properties of the spectra clearly indicate that the top valence band has gamma_7 symmetry the outofplane component of the magnetic field which is parallel to the samples c axis leads to linear zeeman splitting of both the dipoleallowed gamma_5 exciton state and the weakly allowed gamma_1gamma_2 exciton states the inplane field which is perpendicular to the c axis increases the oscillator strength of the weak gamma_1gamma_2 states by forming a mixed exciton state
|
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|
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|
706.3966
|
A double-slit `which-way' experiment on the complementarity--uncertainty
debate
|
A which-way measurement in Young's double-slit will destroy the interference
pattern. Bohr claimed this complementarity between wave- and particle behaviour
is enforced by Heisenberg's uncertainty principle: distinguishing two positions
a distance s apart transfers a random momentum q \sim \hbar/s to the particle.
This claim has been subject to debate: Scully et al. asserted that in some
situations interference can be destroyed with no momentum transfer, while
Storey et al. asserted that Bohr's stance is always valid. We address this
issue using the experimental technique of weak measurement. We measure a
distribution for q that spreads well beyond [-\hbar/s, \hbar/s], but
nevertheless has a variance consistent with zero. This weakvalued
momentum-transfer distribution P_{wv}(q) thus reflects both sides of the
debate.
|
quant-ph
|
a whichway measurement in youngs doubleslit will destroy the interference pattern bohr claimed this complementarity between wave and particle behaviour is enforced by heisenbergs uncertainty principle distinguishing two positions a distance s apart transfers a random momentum q sim hbars to the particle this claim has been subject to debate scully et al asserted that in some situations interference can be destroyed with no momentum transfer while storey et al asserted that bohrs stance is always valid we address this issue using the experimental technique of weak measurement we measure a distribution for q that spreads well beyond hbars hbars but nevertheless has a variance consistent with zero this weakvalued momentumtransfer distribution p_wvq thus reflects both sides of the debate
|
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|
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|
706.3967
|
Revisiting Rotational Perturbations and the Microwave Background
|
We consider general-relativistic rotational perturbations in homogeneous and
isotropic Friedman - Robertson - Walker (FRW) cosmologies. Taking linear
perturbations of FRW models, the general solution of the field equations
contains tensorial, vectorial and scalar functions. The vectorial terms are in
connection with rotations in the given model and due to the Sachs - Wolfe
effect they produce contributions to the temperature fluctuations of the cosmic
microwave background radiation (CMBR). In present paper we obtain the analytic
time dependence of these contributions in a spatially flat, FRW model with
pressureless ideal fluid, in the presence and the absence of a cosmological
constant. We find that the solution can be separated into an integrable and a
non-integrable part as is the situation in the case of scalar perturbations.
Analyzing the solutions and using the results of present observations we
estimate the order of magnitude of the angular velocity corresponding to the
rotation tensor at the time of decoupling and today.
|
astro-ph
|
we consider generalrelativistic rotational perturbations in homogeneous and isotropic friedman robertson walker frw cosmologies taking linear perturbations of frw models the general solution of the field equations contains tensorial vectorial and scalar functions the vectorial terms are in connection with rotations in the given model and due to the sachs wolfe effect they produce contributions to the temperature fluctuations of the cosmic microwave background radiation cmbr in present paper we obtain the analytic time dependence of these contributions in a spatially flat frw model with pressureless ideal fluid in the presence and the absence of a cosmological constant we find that the solution can be separated into an integrable and a nonintegrable part as is the situation in the case of scalar perturbations analyzing the solutions and using the results of present observations we estimate the order of magnitude of the angular velocity corresponding to the rotation tensor at the time of decoupling and today
|
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|
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|
706.3968
|
Multiscale inference about a density
|
We introduce a multiscale test statistic based on local order statistics and
spacings that provides simultaneous confidence statements for the existence and
location of local increases and decreases of a density or a failure rate. The
procedure provides guaranteed finite-sample significance levels, is easy to
implement and possesses certain asymptotic optimality and adaptivity
properties.
|
math.ST stat.TH
|
we introduce a multiscale test statistic based on local order statistics and spacings that provides simultaneous confidence statements for the existence and location of local increases and decreases of a density or a failure rate the procedure provides guaranteed finitesample significance levels is easy to implement and possesses certain asymptotic optimality and adaptivity properties
|
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|
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|
706.3969
|
Passage Times for Polymer Translocation Pulled through a Narrow Pore
|
We study the passage times of a translocating polymer of length $N$ in three
dimensions, while it is pulled through a narrow pore with a constant force $F$
applied to one end of the polymer. At small to moderate forces, satisfying the
condition $FN^{\nu}/k_BT\lesssim1$, where $\nu\approx0.588$ is the Flory
exponent for the polymer, we find that $\tau_N$, the mean time the polymer
takes to leave the pore, scales as $N^{2+\nu}$ independent of $F$, in agreement
with our earlier result for F=0. At strong forces, i.e., for
$FN^{\nu}/k_BT\gg1$, the behaviour of the passage time crosses over to
$\tau_N\sim N^2/F$. We show here that these behaviours stem from the polymer
dynamics at the immediate vicinity of the pore -- in particular, the memory
effects in the polymer chain tension imbalance across the pore.
|
cond-mat.soft cond-mat.stat-mech physics.bio-ph q-bio.BM
|
we study the passage times of a translocating polymer of length n in three dimensions while it is pulled through a narrow pore with a constant force f applied to one end of the polymer at small to moderate forces satisfying the condition fnnuk_btlesssim1 where nuapprox0588 is the flory exponent for the polymer we find that tau_n the mean time the polymer takes to leave the pore scales as n2nu independent of f in agreement with our earlier result for f0 at strong forces ie for fnnuk_btgg1 the behaviour of the passage time crosses over to tau_nsim n2f we show here that these behaviours stem from the polymer dynamics at the immediate vicinity of the pore in particular the memory effects in the polymer chain tension imbalance across the pore
|
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|
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|
706.397
|
Raynaud vector bundles
|
We construct vector bundles $R^r_\mu$ on a smooth projective curve $X$ having
the property that for all sheaves $E$ of slope $\mu$ and rank $r$ on $X$ we
have an equivalence: $E$ is a semistable vector bundle $\iff$
$Hom(R^r_\mu,E)=0$.
As a byproduct of our construction we obtain effective bounds on $r$ such
that the linear system $|R \cdot \Theta|$ has base points on the moduli space
$U_X(r,r(g-1))$.
|
math.AG
|
we construct vector bundles rr_mu on a smooth projective curve x having the property that for all sheaves e of slope mu and rank r on x we have an equivalence e is a semistable vector bundle iff homrr_mue0 as a byproduct of our construction we obtain effective bounds on r such that the linear system r cdot theta has base points on the moduli space u_xrrg1
|
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|
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|
706.3971
|
On the L^p-distorsion of finite quotients of amenable groups
|
We study the L^p-distortion of finite quotients of amenable groups. In
particular, for every number p larger or equal than 2, we prove that the
l^p-distortion of the finite lamplighter group grows like (\log n)^{1/p}. We
also give the asymptotic behavior of the l^p-distortion of finite quotients of
certain metabelian polycyclic groups and of the solvable Baumslag-Solitar
groups BS(m,1). The proofs are short and elementary.
|
math.MG
|
we study the lpdistortion of finite quotients of amenable groups in particular for every number p larger or equal than 2 we prove that the lpdistortion of the finite lamplighter group grows like log n1p we also give the asymptotic behavior of the lpdistortion of finite quotients of certain metabelian polycyclic groups and of the solvable baumslagsolitar groups bsm1 the proofs are short and elementary
|
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|
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|
706.3972
|
XMM-Newton observation of the persistent Be/neutron-star system X Persei
at a high-luminosity level
|
We report on the XMM-Newton observation of the HMXRB X Persei, the prototype
of the persistent and low-luminosity Be/neutron star pulsars, which was
performed on February 2003. The source was detected at a luminosity level of ~
1.4x10^35 erg/s, which is the highest level of the latest three decades. The
pulsation period has increased up to 839.3 s, thus confirming the overall
spin-down of the NS detected in the previous observations. The folded
light-curve has a complex structure, with features not observed at lower
luminosities, and shows a significant energy dependence. The spectral analysis
reveals the presence of a significant excess at low energies over the main
power-law spectral component, which can be described by a black-body spectrum
of high temperature (kT_BB ~ 1.5 keV) and small emitting region (R_BB ~ 340 m);
its properties are consistent with a polar-cap origin. Phase-resolved
spectroscopy shows that the emission spectrum varies along the pulse period,
but it is not possible to prove whether the thermal component is pulsed or not.
|
astro-ph
|
we report on the xmmnewton observation of the hmxrb x persei the prototype of the persistent and lowluminosity beneutron star pulsars which was performed on february 2003 the source was detected at a luminosity level of 14x1035 ergs which is the highest level of the latest three decades the pulsation period has increased up to 8393 s thus confirming the overall spindown of the ns detected in the previous observations the folded lightcurve has a complex structure with features not observed at lower luminosities and shows a significant energy dependence the spectral analysis reveals the presence of a significant excess at low energies over the main powerlaw spectral component which can be described by a blackbody spectrum of high temperature kt_bb 15 kev and small emitting region r_bb 340 m its properties are consistent with a polarcap origin phaseresolved spectroscopy shows that the emission spectrum varies along the pulse period but it is not possible to prove whether the thermal component is pulsed or not
|
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|
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|
706.3973
|
Whitehead-Torsion und Faserungen
|
This work treats on the question whether a given map f: M -> B of smooth
closed manifolds is homotopic to a smooth fiber bundle. We define a first
obstruction in H^1(B;Wh(\pi_1(E))) and, provided that this obstruction vanishes
and one additional condition is verified, a second obstruction in Wh(\pi_1(E))
>. Both elements vanish if the answer to the above question is positive. In the
case where B is the 1-sphere and the dimension of M exceeds five, we show that
the converse is also true, using a relationship with two obstructions defined
by Farrell in this particular situation.
|
math.GT
|
this work treats on the question whether a given map f m b of smooth closed manifolds is homotopic to a smooth fiber bundle we define a first obstruction in h1bwhpi_1e and provided that this obstruction vanishes and one additional condition is verified a second obstruction in whpi_1e both elements vanish if the answer to the above question is positive in the case where b is the 1sphere and the dimension of m exceeds five we show that the converse is also true using a relationship with two obstructions defined by farrell in this particular situation
|
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|
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|
706.3974
|
Kinetic and hydrodynamic models of chemotactic aggregation
|
We derive general kinetic and hydrodynamic models of chemotactic aggregation
that describe certain features of the morphogenesis of biological colonies
(like bacteria, amoebae, endothelial cells or social insects). Starting from a
stochastic model defined in terms of N coupled Langevin equations, we derive a
nonlinear mean field Fokker-Planck equation governing the evolution of the
distribution function of the system in phase space. By taking the successive
moments of this kinetic equation and using a local thermodynamic equilibrium
condition, we derive a set of hydrodynamic equations involving a damping term.
In the limit of small frictions, we obtain a hyperbolic model describing the
formation of network patterns (filaments) and in the limit of strong frictions
we obtain a parabolic model which is a generalization of the standard
Keller-Segel model describing the formation of clusters (clumps). Our approach
connects and generalizes several models introduced in the chemotactic
literature. We discuss the analogy between bacterial colonies and
self-gravitating systems and between the chemotactic collapse and the
gravitational collapse (Jeans instability). We also show that the basic
equations of chemotaxis are similar to nonlinear mean field Fokker-Planck
equations so that a notion of effective generalized thermodynamics can be
developed.
|
physics.bio-ph
|
we derive general kinetic and hydrodynamic models of chemotactic aggregation that describe certain features of the morphogenesis of biological colonies like bacteria amoebae endothelial cells or social insects starting from a stochastic model defined in terms of n coupled langevin equations we derive a nonlinear mean field fokkerplanck equation governing the evolution of the distribution function of the system in phase space by taking the successive moments of this kinetic equation and using a local thermodynamic equilibrium condition we derive a set of hydrodynamic equations involving a damping term in the limit of small frictions we obtain a hyperbolic model describing the formation of network patterns filaments and in the limit of strong frictions we obtain a parabolic model which is a generalization of the standard kellersegel model describing the formation of clusters clumps our approach connects and generalizes several models introduced in the chemotactic literature we discuss the analogy between bacterial colonies and selfgravitating systems and between the chemotactic collapse and the gravitational collapse jeans instability we also show that the basic equations of chemotaxis are similar to nonlinear mean field fokkerplanck equations so that a notion of effective generalized thermodynamics can be developed
|
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|
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|
706.3975
|
Hierarchical Spatial Organization of Geographical Networks
|
In this work we propose the use of a hirarchical extension of the
polygonality index as a means to characterize and model geographical networks:
each node is associated with the spatial position of the nodes, while the edges
of the network are defined by progressive connectivity adjacencies. Through the
analysis of such networks, while relating its topological and geometrical
properties, it is possible to obtain important indications about the
development dynamics of the networks under analysis. The potential of the
methodology is illustrated with respect to synthetic geographical networks.
|
physics.soc-ph
|
in this work we propose the use of a hirarchical extension of the polygonality index as a means to characterize and model geographical networks each node is associated with the spatial position of the nodes while the edges of the network are defined by progressive connectivity adjacencies through the analysis of such networks while relating its topological and geometrical properties it is possible to obtain important indications about the development dynamics of the networks under analysis the potential of the methodology is illustrated with respect to synthetic geographical networks
|
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|
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|
706.3976
|
Towards an Experimental Test of Gravity-induced Quantum State Reduction
|
According to the hypothesis of Penrose and Diosi, quantum state reduction is
a manifestation of the incompatibilty of general relativity and the unitary
time evolution of quantum physics. Dimensional analysis suggests that
Schrodinger cat type states should collapse on measurable time scales when
masses and lengths of the order of bacterial scales are involved. We analyze
this hypothesis in the context of modern developments in condensed matter and
cold atoms physics, aimed at realizing macroscopic quantum states. We first
consider 'micromechanical' quantum states, analyzing the capacity of an atomic
force microscopy based single spin detector to measure the gravitational state
reduction, but we conclude that it seems impossible to suppress environmental
decoherence to the required degree. We subsequently discuss 'split' cold atom
condensates to find out that these are at present lacking the required mass
scale by many orders of magnitude. We then extent Penrose's analysis to
superpositions of mass current carrying states, and we apply this to the flux
quantum bits realized in superconducting circuits. We find that the flux qubits
approach the scale where gravitational state reduction should become
measurable, but bridging the few remaining orders of magnitude appears to be
very difficult with present day technology.
|
cond-mat.str-el cond-mat.other quant-ph
|
according to the hypothesis of penrose and diosi quantum state reduction is a manifestation of the incompatibilty of general relativity and the unitary time evolution of quantum physics dimensional analysis suggests that schrodinger cat type states should collapse on measurable time scales when masses and lengths of the order of bacterial scales are involved we analyze this hypothesis in the context of modern developments in condensed matter and cold atoms physics aimed at realizing macroscopic quantum states we first consider micromechanical quantum states analyzing the capacity of an atomic force microscopy based single spin detector to measure the gravitational state reduction but we conclude that it seems impossible to suppress environmental decoherence to the required degree we subsequently discuss split cold atom condensates to find out that these are at present lacking the required mass scale by many orders of magnitude we then extent penroses analysis to superpositions of mass current carrying states and we apply this to the flux quantum bits realized in superconducting circuits we find that the flux qubits approach the scale where gravitational state reduction should become measurable but bridging the few remaining orders of magnitude appears to be very difficult with present day technology
|
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|
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|
706.3977
|
Multipolar expansion of the electrostatic interaction between charged
colloids at interfaces
|
The general form of the electrostatic potential around an arbitrarily charged
colloid at an interface between a dielectric and a screening phase (such as air
and water, respectively) is analyzed in terms of a multipole expansion. The
leading term is isotropic in the interfacial plane and varies with $d^{-3}$
where $d$ is the in--plane distance from the colloid. The electrostatic
interaction potential between two arbitrarily charged colloids is likewise
isotropic and $\propto d^{-3}$, corresponding to the dipole--dipole interaction
first found for point charges at water interfaces. Anisotropic interaction
terms arise only for higher powers $d^{-n}$ with $n \ge 4$.
|
cond-mat.soft
|
the general form of the electrostatic potential around an arbitrarily charged colloid at an interface between a dielectric and a screening phase such as air and water respectively is analyzed in terms of a multipole expansion the leading term is isotropic in the interfacial plane and varies with d3 where d is the inplane distance from the colloid the electrostatic interaction potential between two arbitrarily charged colloids is likewise isotropic and propto d3 corresponding to the dipoledipole interaction first found for point charges at water interfaces anisotropic interaction terms arise only for higher powers dn with n ge 4
|
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|
[-0.17331483540115783, 0.20443817399909034, -0.004197534926310934, 0.028938664316265572, 0.02595685545656115, -0.1686123602910701, -0.043913516874490965, 0.3573806602131538, -0.24522197488319092, -0.2968836981953696, -0.009506628916815224, -0.3609430491924286, -0.12506949980837304, 0.11709174327787501, 0.09206974174653303, -0.035855638841637456, -0.0591885967043727, 0.02510331602146228, -0.05656631000227097, -0.15700356024429155, 0.276697669385208, 0.025485094354459732, 0.22366322805479433, 0.16006713708618073, 0.06281621806379972, 0.016901083229429494, 0.06671923697653293, 0.049616662093974424, -0.12198399047301424, 0.08065441854749665, 0.22313719872335874, -0.10030904289033979, 0.1855646972197597, -0.4291441293828415, -0.1600032640301218, 0.08106541498140855, 0.165968592015255, 0.11437294966155531, -0.05898737707034205, -0.22505294754536767, 0.028747723663620876, -0.1477425465774205, -0.17253284036849786, 0.0006520909591192248, 0.10453791107342701, 0.05768713440435628, -0.3202432934006657, 0.1219165227799253, 0.04356882371234171, 0.06408985131279085, -0.09517691006432429, -0.11837333045556502, -0.046380964728693165, 0.09985821871463248, 0.08077198049204067, 0.1057146563396949, 0.1630546934514617, -0.1436222780829841, -0.021834298864834838, 0.39728051262691316, -0.0771106474590723, -0.22122050045679012, 0.21481903876657737, -0.14740997168113185, 0.00454650723817523, 0.17874251505374117, 0.15410325311669948, 0.09027478393964526, -0.1429570709364583, 0.1431525582141911, 0.04665169613012536, 0.18936385815602144, 0.14372262402409405, -0.016404406235181735, 0.23690882603158103, 0.12222334466794638, 0.052569156437359675, 0.15705260913819075, -0.09965369585346469, -0.06272389607108904, -0.3037550016071158, -0.1667454315706937, -0.22221383796369826, 0.0394642656490282, -0.20519624523421034, -0.1761500918485149, 0.30154836399602997, 0.052991819733194064, 0.16541034152561968, 0.014013967711967652, 0.22858285220490412, 0.07127493976337854, 0.02048234868267871, 0.06751038964056984, 0.2734531701326069, 0.10956256752457431, 0.1183334687263752, -0.25098296322841007, 0.020524502402604228, 0.07576439084692134]
|
706.3978
|
Holographic heavy-light mesons from non-Abelian DBI
|
In the context of gauge/gravity duals with flavor, we examine heavy-light
mesons which involve a heavy and a light quark. For this purpose we embed two
D7 brane probes at different positions into the gravity background. We
establish the non-Abelian Dirac-Born-Infeld (DBI) action for these probes, in
which the U(2) matrix describing the embedding is diagonal. The fluctuations of
the brane probes correspond to the mesons. In particular, the off-diagonal
elements of the U(2) fluctuation matrix correspond to the heavy-light mesons,
while the diagonal elements correspond to the light-light and heavy-heavy
mesons, respectively. The heavy-light mesons scale differently with the 't
Hooft coupling than the mesons involving quarks of equal mass. The model
describes both scalar and vector mesons. For different dilaton-deformed gravity
backgrounds, we also calculate the Wilson loop energy, and compare with the
meson masses.
|
hep-th
|
in the context of gaugegravity duals with flavor we examine heavylight mesons which involve a heavy and a light quark for this purpose we embed two d7 brane probes at different positions into the gravity background we establish the nonabelian diracborninfeld dbi action for these probes in which the u2 matrix describing the embedding is diagonal the fluctuations of the brane probes correspond to the mesons in particular the offdiagonal elements of the u2 fluctuation matrix correspond to the heavylight mesons while the diagonal elements correspond to the lightlight and heavyheavy mesons respectively the heavylight mesons scale differently with the t hooft coupling than the mesons involving quarks of equal mass the model describes both scalar and vector mesons for different dilatondeformed gravity backgrounds we also calculate the wilson loop energy and compare with the meson masses
|
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|
[-0.09658244794905733, 0.2998797803405015, -0.05397351741489461, 0.1468855161630713, -0.03434810384094496, -0.1643815639117212, -0.0159300661933444, 0.29764225472257855, -0.15147984926314914, -0.184681277598857, -0.02686754809024826, -0.345105801243335, -0.019100192496005225, 0.02784184387522092, 0.055931935319676995, 0.05339986492660554, 0.0008566614500630428, 0.0832709985655075, -0.11865327176072991, -0.19558520307627453, 0.3736628861173385, -0.06799639519886114, 0.21646702434501255, 0.12481756742550608, 0.044980710231945574, -0.0009663277357022333, -0.03278620086048784, -0.051692956394296795, -0.0823226664591964, 0.08182000218264018, 0.1863233856013668, 0.05137449574163731, 0.07406215534052428, -0.406959567205323, -0.1603289105474045, 0.1418375286850599, 0.17168802861466675, 0.14892749484244952, 0.018644815844976726, -0.3045047665809226, 0.07317276394186432, -0.15896261304699102, -0.1447413636933026, -0.11443889124134063, -0.0076296462656875305, -0.07184169814204591, -0.31910681402694213, 0.07195489021400778, -0.06964419785585693, -0.006013950683315189, -0.0661626260386102, -0.20854354707989842, -0.04179586742504719, 0.06051598850172013, 0.17126842257172992, 0.07776321870658327, 0.1504912685863126, -0.1899489217201549, -0.10499742730804856, 0.44097585741923573, -0.12394510990794944, -0.2336696154465351, 0.12946301416891134, -0.15656476309488745, -0.14021097229766277, 0.02076563883421092, 0.18984261984427148, 0.10952074274502914, -0.16833595860311212, 0.16999476142604286, -0.04069169977275819, 0.12699766350937458, 0.1331467525977881, 0.13798227679559633, 0.2632446788210312, 0.11654227818122737, -0.041427949898848855, 0.09381117503268316, -0.021446018753682867, -0.1132842279107803, -0.39634567789514275, -0.12454759433304015, -0.0695729084271828, 0.06583661190234125, -0.18901934511814034, -0.12502906377673806, 0.44767943288452977, 0.096133200225749, 0.24229234574458508, 0.032795297199353465, 0.24558040785931928, 0.04835830451509751, 0.0809093615560628, 0.12151267727741095, 0.3018393365919645, 0.24270569000338368, 0.1610539932786624, -0.34478256134110885, -0.14223962884759256, 0.18476380451979554]
|
706.3979
|
The informational model - possible tests
|
In our previous arXiv papers (more systematically the informational
conception is presented in the paper "The Information as Absolute", 2010) it
was rigorously shown that Matter in our Universe - and Universe as a whole -
are some informational systems (structures), which exist as uninterruptedly
transforming [practically] infinitesimal sub-sets in the absolutely infinite
and fundamental set "Information". Such a conception allows to suggest a
reasonable physical model that is based on the conjecture that Matter is some
analogue of computer (more correct - of a [huge] number of mutually
comparatively independent automata). The conjecture, in turn, allows
introducing in the model the basic logical elements that constitute the
material structures and support the informational exchange - i.e. the forces -
between the structures. The model yet now makes more clear a number of basic
problems in special relativity, quantum mechanics, and, rather probably, in
[now - in Newtonian] gravity. In this paper some possible experiments for the
model testing are considered.
|
physics.gen-ph
|
in our previous arxiv papers more systematically the informational conception is presented in the paper the information as absolute 2010 it was rigorously shown that matter in our universe and universe as a whole are some informational systems structures which exist as uninterruptedly transforming practically infinitesimal subsets in the absolutely infinite and fundamental set information such a conception allows to suggest a reasonable physical model that is based on the conjecture that matter is some analogue of computer more correct of a huge number of mutually comparatively independent automata the conjecture in turn allows introducing in the model the basic logical elements that constitute the material structures and support the informational exchange ie the forces between the structures the model yet now makes more clear a number of basic problems in special relativity quantum mechanics and rather probably in now in newtonian gravity in this paper some possible experiments for the model testing are considered
|
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|
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|
706.398
|
Fluctuation Propagator and Heavy Quark Diffusion
|
The quark fluctuation propagator is evaluated. It defines the diffusion
coefficient in the vicinity of the phase transition and the gradient term in
the Ginzburg-Landau functional.
|
hep-ph
|
the quark fluctuation propagator is evaluated it defines the diffusion coefficient in the vicinity of the phase transition and the gradient term in the ginzburglandau functional
|
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|
[-0.17730477217656487, 0.16824028139504102, -0.14084264858124348, 0.0831834751029069, -0.03375540616420599, -0.02461715801977194, 0.05543701035472063, 0.2795684084009666, -0.2893876556593638, -0.19599689872792134, 0.03719619202176826, -0.34587634813327056, -0.16874859181161111, 0.05400085305938354, 0.07380349497095896, 0.04648533850335158, -0.05135356427098696, 0.11594376618114229, -0.07790502717790122, -0.16247368661256936, 0.3429062565645346, -0.011687560221896721, 0.32056290595434034, 0.11175918607757641, 0.10034244400090896, -0.00767650159720618, 0.04026492140614069, -0.016409838285583716, -0.1250307523788741, -8.331074451024715e-05, 0.1863497836188449, -0.06057195043048033, 0.19283467303746596, -0.34767167098247087, -0.2906091951389009, 0.041609885914322846, 0.11296004803779607, 0.0746398840386134, -0.01091782902725614, -0.2847579459731395, 0.007162242769621885, -0.14063008416157502, -0.13212933149546957, -0.07599802988653, 0.007479138152960401, -0.020657296507404402, -0.29348079201120597, 0.20570791842272648, -0.02808534962913165, 0.02177204994054941, -0.06620319479574951, -0.13321312950350916, -0.05603225264125145, 0.08685652784501705, 0.09127824591436925, 0.12112605174143727, 0.18322042477806322, -0.19490357328994343, -0.000954242915703127, 0.3700670577012576, -0.17603079774058783, -0.20020321427056423, 0.07058457356805985, -0.2126647664162402, -0.053759933019486755, 0.13247415609657764, 0.08191708117150344, 0.1231468793971894, -0.21315846538457733, 0.1548979478471805, 0.07302210873995836, 0.14590763630202183, 0.036321499528220065, -0.03632787228203737, 0.1202801986095997, 0.20737083492657313, 0.0118349666456477, 0.1641693681012839, -0.1270111113643417, -0.23157524747344163, -0.3599702244481215, -0.1801247140392661, -0.22668253637563723, -0.027938731265469238, -0.1846544496673652, -0.22510114460377595, 0.3984072054378115, 0.16048426216898057, 0.154641319388667, -0.0018575025650744254, 0.22259453386784747, 0.2674584729740253, 0.0913459461612197, 0.07922269015286404, 0.2691466151109825, 0.19985990583574256, 0.21615052205295518, -0.35689471792787886, 0.08073682533218883, 0.16520599297319466]
|
706.3981
|
On the Greenfield-Wallach and Katok conjectures
|
We survey recent progress on the Greenfield-Wallach and Katok conjectures on
globally hypoelliptic and cohomology free vector fields and derive a proof of
the conjectures in dimension three. The argument is primarily based on recent
work of F. and J. Rodriguez Hertz which allows us to reduce the question to the
case of a Reeb flow for a contact form. The contact case is settled by invoking
the Weinstein conjecture (which has been recently announced by C. Taubes).
|
math.DS
|
we survey recent progress on the greenfieldwallach and katok conjectures on globally hypoelliptic and cohomology free vector fields and derive a proof of the conjectures in dimension three the argument is primarily based on recent work of f and j rodriguez hertz which allows us to reduce the question to the case of a reeb flow for a contact form the contact case is settled by invoking the weinstein conjecture which has been recently announced by c taubes
|
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|
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|
706.3982
|
Lorentz anomaly in the semi-light-cone gauge superstrings
|
We study the Lorentz invariance of D=4 and 6 superstrings in the
double-spinor formalism, which are equivalent to the D=4 and 6 superstrings in
the pure-spinor formalism in the sense of the BRST cohomology. We first
re-examine how the conformal and Lorentz anomalies appear in the D=4 and 6
Green-Schwarz superstrings in the semi-light-cone gauge in the framework of
BRST quantization. We construct a set of BRST invariant Lorentz generators and
show that they do not form a closed algebra, even cohomologically. We then turn
to the construction of Lorentz generators in the D=4 and 6 double-spinor
superstrings, and show that the Lorentz invariance is again anomalous. We also
discuss the relation between the anomaly-free Lorentz generators in the
lower-dimensional pure-spinor formalisms and that obtained in this paper.
|
hep-th
|
we study the lorentz invariance of d4 and 6 superstrings in the doublespinor formalism which are equivalent to the d4 and 6 superstrings in the purespinor formalism in the sense of the brst cohomology we first reexamine how the conformal and lorentz anomalies appear in the d4 and 6 greenschwarz superstrings in the semilightcone gauge in the framework of brst quantization we construct a set of brst invariant lorentz generators and show that they do not form a closed algebra even cohomologically we then turn to the construction of lorentz generators in the d4 and 6 doublespinor superstrings and show that the lorentz invariance is again anomalous we also discuss the relation between the anomalyfree lorentz generators in the lowerdimensional purespinor formalisms and that obtained in this paper
|
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|
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|
706.3983
|
Social applications of two-dimensional Ising models
|
I review three socio-economic models of economic opinions, urban segregation,
and language change and show that the well known two-dimensional Ising model
gives about the same results in each case.
|
physics.soc-ph
|
i review three socioeconomic models of economic opinions urban segregation and language change and show that the well known twodimensional ising model gives about the same results in each case
|
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|
[-0.054060543219869334, 0.09388747548994919, -0.027171549449364344, 0.11603644561643402, -0.05897875148802996, -0.16915021582196157, -0.0008813345591382434, 0.3631414600958427, -0.19905446854730446, -0.3036147547264894, 0.05711790988765036, -0.30040603975454966, -0.2420379767815272, 0.13552699268329887, -0.07729117472966512, -0.019367922221620877, 0.040096119962011775, 0.06289039844026169, -0.008850872819311916, -0.3336611486971378, 0.29299788136656085, -0.06322082268695037, 0.34774305000901223, 0.07420621830970049, 0.08481129015175005, -0.011281604537119468, -0.044994493449727696, 0.011071051036318143, -0.16684053550440392, 0.10487480672697226, 0.2674251550242237, 0.17061145181457202, 0.2794228382408619, -0.4144007076819738, -0.2501219488059481, 0.03837866890632237, 0.1348625528315703, 0.12297711341331402, 0.016248976501325767, -0.2933236077971136, -0.011514367361087352, -0.24516224777325987, -0.10816012468809882, -0.029923206008970738, 0.0032415786913285653, 0.05629682997241616, -0.21717775833094494, 0.09481236518671116, 0.12844260040437802, 0.1498941062328716, -0.13352559187139074, -0.1650142420393725, -0.07445490975709011, 0.20647227289058112, 0.12104039092470581, -0.02555753958101074, 0.15824741488322616, -0.15499245148772994, -0.20303738700846832, 0.43090807472666104, -0.036498195864260195, -0.165559183464696, 0.24717848111564913, -0.20240537070979675, -0.18097632828479013, -0.048051374207716435, 0.17005910410856206, -0.004556317751606306, -0.15478435661643744, 0.037075569383644806, -0.08154638310273489, 0.16567998981724183, -0.0009779382807513079, -0.04098541314403216, 0.20607552162061135, 0.21075518258536854, 0.08494950278351704, 0.11287407978282621, -0.0016050145650903383, -0.2037623597929875, -0.24506163851668436, -0.1426689626649022, -0.14152431711554528, 0.05938918761288126, -0.17313586361609243, -0.15018423298994701, 0.45073188431560995, 0.19666847735643386, 0.19175166754672926, 0.0612916490683953, 0.20805832054466009, 0.01456345518430074, -0.018697463845213255, 0.0870291647190849, 0.1263137271006902, 0.030131651336948076, 0.17062853071838618, -0.16827059139808018, 0.13195401316819091, 0.021567607143272955]
|
706.3984
|
A Comparison of Push and Pull Techniques for Ajax
|
Ajax applications are designed to have high user interactivity and low
user-perceived latency. Real-time dynamic web data such as news headlines,
stock tickers, and auction updates need to be propagated to the users as soon
as possible. However, Ajax still suffers from the limitations of the Web's
request/response architecture which prevents servers from pushing real-time
dynamic web data. Such applications usually use a pull style to obtain the
latest updates, where the client actively requests the changes based on a
predefined interval. It is possible to overcome this limitation by adopting a
push style of interaction where the server broadcasts data when a change occurs
on the server side. Both these options have their own trade-offs. This paper
explores the fundamental limits of browser-based applications and analyzes push
solutions for Ajax technology. It also shows the results of an empirical study
comparing push and pull.
|
cs.SE cs.PF
|
ajax applications are designed to have high user interactivity and low userperceived latency realtime dynamic web data such as news headlines stock tickers and auction updates need to be propagated to the users as soon as possible however ajax still suffers from the limitations of the webs requestresponse architecture which prevents servers from pushing realtime dynamic web data such applications usually use a pull style to obtain the latest updates where the client actively requests the changes based on a predefined interval it is possible to overcome this limitation by adopting a push style of interaction where the server broadcasts data when a change occurs on the server side both these options have their own tradeoffs this paper explores the fundamental limits of browserbased applications and analyzes push solutions for ajax technology it also shows the results of an empirical study comparing push and pull
|
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|
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|
706.3985
|
Distributions associated with general runs and patterns in hidden Markov
models
|
This paper gives a method for computing distributions associated with
patterns in the state sequence of a hidden Markov model, conditional on
observing all or part of the observation sequence. Probabilities are computed
for very general classes of patterns (competing patterns and generalized later
patterns), and thus, the theory includes as special cases results for a large
class of problems that have wide application. The unobserved state sequence is
assumed to be Markovian with a general order of dependence. An auxiliary Markov
chain is associated with the state sequence and is used to simplify the
computations. Two examples are given to illustrate the use of the methodology.
Whereas the first application is more to illustrate the basic steps in applying
the theory, the second is a more detailed application to DNA sequences, and
shows that the methods can be adapted to include restrictions related to
biological knowledge.
|
stat.ME stat.AP stat.CO
|
this paper gives a method for computing distributions associated with patterns in the state sequence of a hidden markov model conditional on observing all or part of the observation sequence probabilities are computed for very general classes of patterns competing patterns and generalized later patterns and thus the theory includes as special cases results for a large class of problems that have wide application the unobserved state sequence is assumed to be markovian with a general order of dependence an auxiliary markov chain is associated with the state sequence and is used to simplify the computations two examples are given to illustrate the use of the methodology whereas the first application is more to illustrate the basic steps in applying the theory the second is a more detailed application to dna sequences and shows that the methods can be adapted to include restrictions related to biological knowledge
|
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|
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|
706.3986
|
Positivity of Some Integral Transforms, and Generalization of Bochner's
Theorem on Functions of Positive Type
|
Using the integral representations of the solutions of Schr\"odinger
equation, which are the essential ingredients of the Gel'fand-Levitan and
Marchenko integral equations of inverse scattering theory, we obtain a general
theorem on the positivity of some integral transforms, and extend the theorem
of Bochner on Fourier transforms of functions of positive type to more general
transforms. The present study is restricted to the positive half-axis. We then
obtain a theorem on the positivity of Fourier cosine transform of the
phase-shifts.
|
math-ph math.MP
|
using the integral representations of the solutions of schrodinger equation which are the essential ingredients of the gelfandlevitan and marchenko integral equations of inverse scattering theory we obtain a general theorem on the positivity of some integral transforms and extend the theorem of bochner on fourier transforms of functions of positive type to more general transforms the present study is restricted to the positive halfaxis we then obtain a theorem on the positivity of fourier cosine transform of the phaseshifts
|
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|
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|
706.3987
|
Exciting the quark-gluon plasma with a relativistic jet
|
We discuss the properties of a system composed by a static plasma traversed
by a jet of particles. Assuming that both the jet and the plasma can be
described using a hydrodynamical approach, and in the conformal limit, we find
that unstable modes arise when the velocity of the jet is larger than the speed
of the sound of the plasma and only modes with momenta smaller than a certain
values are unstable. Moreover, for ultrarelativistic velocities of the jet the
most unstable modes correspond to relative angles between the velocity of the
jet and momentum of the collective mode ~ pi/4. Our results suggest an
alternative mechanism for the description of the jet quenching phenomenon,
where the jet crossing the plasma loses energy exciting colored unstable modes.
In LHC this effect should be seen with an enhanced production of hadrons for
some specific values of their momenta and in certain directions of momenta
space.
|
hep-ph
|
we discuss the properties of a system composed by a static plasma traversed by a jet of particles assuming that both the jet and the plasma can be described using a hydrodynamical approach and in the conformal limit we find that unstable modes arise when the velocity of the jet is larger than the speed of the sound of the plasma and only modes with momenta smaller than a certain values are unstable moreover for ultrarelativistic velocities of the jet the most unstable modes correspond to relative angles between the velocity of the jet and momentum of the collective mode pi4 our results suggest an alternative mechanism for the description of the jet quenching phenomenon where the jet crossing the plasma loses energy exciting colored unstable modes in lhc this effect should be seen with an enhanced production of hadrons for some specific values of their momenta and in certain directions of momenta space
|
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|
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|
706.3988
|
5-dimensional solution with acceleration and small variation of G
|
A 5-dimensional cosmological solution in the model with two 2-forms and two
``phantom'' scalar fields is considered. The model contains two dilatonic
coupling vectors obeying certain restrictions. It is shown that there exists a
time interval where accelerating expansion of ``our'' 3-dimensional space is
compatible with a small value of effective gravitational ``constant''
variation.
|
gr-qc astro-ph
|
a 5dimensional cosmological solution in the model with two 2forms and two phantom scalar fields is considered the model contains two dilatonic coupling vectors obeying certain restrictions it is shown that there exists a time interval where accelerating expansion of our 3dimensional space is compatible with a small value of effective gravitational constant variation
|
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|
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|
706.3989
|
Hans-Juergen Treder and the discovery of confinement in Einstein's
unified field theory
|
In the year 1957, when interest in Einstein's unified field theory was fading
away for lack of understanding of its physical content, Treder performed a
momentous critical analysis of the possible definitions of the electric
four-current in the theory. As an outcome of this scrutiny he was able to prove
by the E.I.H. method that properly defined point charges, appended at the
right-hand side of the field equation $R_{[[\mu\nu],\lambda]}=0$, interact
mutually with Coulomb-like forces, provided that a mutual force independent of
distance is present too. This unwanted, but unavoidable addition, could not but
lay further disbelief on the efforts initiated by Einstein and Schroedinger one
decade earlier. However in 1980 Treder himself recalled that the potential
$\phi=a/r+cr$, found by him in 1957, was the one used by particle physicists to
account phenomenologically for the spectrum of bound quark systems like mesons.
Exact solutions have later confirmed beyond any doubt that Einstein's unified
field theory does account in a simple way, already in classical form, for the
confinement of pole charges defined by the four-current first availed of by
Treder. In the present paper it is proposed, ad memoriam, a thorough
recollection of the article published by Treder in 1957, showing the way kept
by him to find what would have been later recognized as confinement in
Einstein's unified field theory.
|
physics.hist-ph gr-qc
|
in the year 1957 when interest in einsteins unified field theory was fading away for lack of understanding of its physical content treder performed a momentous critical analysis of the possible definitions of the electric fourcurrent in the theory as an outcome of this scrutiny he was able to prove by the eih method that properly defined point charges appended at the righthand side of the field equation r_munulambda0 interact mutually with coulomblike forces provided that a mutual force independent of distance is present too this unwanted but unavoidable addition could not but lay further disbelief on the efforts initiated by einstein and schroedinger one decade earlier however in 1980 treder himself recalled that the potential phiarcr found by him in 1957 was the one used by particle physicists to account phenomenologically for the spectrum of bound quark systems like mesons exact solutions have later confirmed beyond any doubt that einsteins unified field theory does account in a simple way already in classical form for the confinement of pole charges defined by the fourcurrent first availed of by treder in the present paper it is proposed ad memoriam a thorough recollection of the article published by treder in 1957 showing the way kept by him to find what would have been later recognized as confinement in einsteins unified field theory
|
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|
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|
706.399
|
The order completion method for systems of nonlinear PDEs:
Pseudo-topological perspectives
|
By setting up appropriate uniform convergence structures, we are able to
reformulate the Order Completion Method of Oberguggenberger and Rosinger in a
setting that more closely resembles the usual topological constructions for
solving PDEs. As an application, we obtain existence and uniqueness results for
the solutions of arbitrary continuous, nonlinear PDEs.
|
math.GM
|
by setting up appropriate uniform convergence structures we are able to reformulate the order completion method of oberguggenberger and rosinger in a setting that more closely resembles the usual topological constructions for solving pdes as an application we obtain existence and uniqueness results for the solutions of arbitrary continuous nonlinear pdes
|
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|
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|
706.3991
|
A Quiver of Many Runaways
|
We study the quantum corrections to the moduli space of the quiver gauge
theory corresponding to regular and fractional D3-branes at the dP_1
singularity. We find that besides the known runaway behavior at the lowest step
of the duality cascade, there is a runaway direction along a mesonic branch at
every higher step of the cascade. Moreover, the algebra of the chiral operators
which obtain the large expectation values is such that we reproduce Altmann's
first order deformation of the dP_1 cone.
|
hep-th
|
we study the quantum corrections to the moduli space of the quiver gauge theory corresponding to regular and fractional d3branes at the dp_1 singularity we find that besides the known runaway behavior at the lowest step of the duality cascade there is a runaway direction along a mesonic branch at every higher step of the cascade moreover the algebra of the chiral operators which obtain the large expectation values is such that we reproduce altmanns first order deformation of the dp_1 cone
|
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|
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|
706.3992
|
Wedge-Local Quantum Fields and Noncommutative Minkowski Space
|
Within the setting of a recently proposed model of quantum fields on
noncommutative Minkowski spacetime, the consequences of the consistent
application of the proper, untwisted Poincare group as the symmetry group are
investigated. The emergent model contains an infinite family of fields which
are labelled by different noncommutativity parameters, and related to each
other by Lorentz transformations. The relative localization properties of these
fields are investigated, and it is shown that to each field one can assign a
wedge-shaped localization region of Minkowski space. This assignment is
consistent with the principles of covariance and locality, i.e. fields
localized in spacelike separated wedges commute.
Regarding the model as a non-local, but wedge-local, quantum field theory on
ordinary (commutative) Minkowski spacetime, it is possible to determine
two-particle S-matrix elements, which turn out to be non-trivial. Some partial
negative results concerning the existence of observables with sharper
localization properties are also obtained.
|
hep-th math-ph math.MP
|
within the setting of a recently proposed model of quantum fields on noncommutative minkowski spacetime the consequences of the consistent application of the proper untwisted poincare group as the symmetry group are investigated the emergent model contains an infinite family of fields which are labelled by different noncommutativity parameters and related to each other by lorentz transformations the relative localization properties of these fields are investigated and it is shown that to each field one can assign a wedgeshaped localization region of minkowski space this assignment is consistent with the principles of covariance and locality ie fields localized in spacelike separated wedges commute regarding the model as a nonlocal but wedgelocal quantum field theory on ordinary commutative minkowski spacetime it is possible to determine twoparticle smatrix elements which turn out to be nontrivial some partial negative results concerning the existence of observables with sharper localization properties are also obtained
|
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|
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|
706.3993
|
Quantum Resonances and Ratchets in Free-Falling Frames
|
Quantum resonance (QR) is defined in the free-falling frame of the quantum
kicked particle subjected to gravity. The general QR conditions are derived.
They imply the rationality of the gravity parameter $\eta$, the kicking-period
parameter $\tau /(2\pi)$, and the quasimomentum $\beta$. Exact results are
obtained concerning wave-packet evolution for arbitrary periodic kicking
potentials in the case of integer $\tau /(2\pi)$ (the main QRs). It is shown
that a quantum ratchet generally arises in this case for resonant $\beta$. The
noninertial nature of the free-falling frame affects the ratchet by effectively
changing the kicking potential to one depending on $(\beta ,\eta)$. For a
simple class of initial wave packets, it is explicitly shown that the ratchet
characteristics are determined to a large extent by symmetry properties and by
number-theoretical features of $\eta$.
|
nlin.CD
|
quantum resonance qr is defined in the freefalling frame of the quantum kicked particle subjected to gravity the general qr conditions are derived they imply the rationality of the gravity parameter eta the kickingperiod parameter tau 2pi and the quasimomentum beta exact results are obtained concerning wavepacket evolution for arbitrary periodic kicking potentials in the case of integer tau 2pi the main qrs it is shown that a quantum ratchet generally arises in this case for resonant beta the noninertial nature of the freefalling frame affects the ratchet by effectively changing the kicking potential to one depending on beta eta for a simple class of initial wave packets it is explicitly shown that the ratchet characteristics are determined to a large extent by symmetry properties and by numbertheoretical features of eta
|
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|
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|
706.3994
|
Attractor scenarios and superluminal signals in k-essence cosmology
|
Cosmological scenarios with k-essence are invoked in order to explain the
observed late-time acceleration of the universe. These scenarios avoid the need
for fine-tuned initial conditions (the "coincidence problem") because of the
attractor-like dynamics of the k-essence field \phi. It was recently shown that
all k-essence scenarios with Lagrangians p=L(X)/\phi^2, necessarily involve an
epoch where perturbations of \phi propagate faster than light (the "no-go
theorem"). We carry out a comprehensive study of attractor-like cosmological
solutions ("trackers") involving a k-essence scalar field \phi and another
matter component. The result of this study is a complete classification of
k-essence Lagrangians that admit asymptotically stable tracking solutions,
among all Lagrangians of the form p=K(\phi)L(X) . Using this classification, we
select the class of models that describe the late-time acceleration and avoid
the coincidence problem through the tracking mechanism. An analogous "no-go
theorem" still holds for this class of models, indicating the existence of a
superluminal epoch. In the context of k-essence cosmology, the superluminal
epoch does not lead to causality violations. We discuss the implications of
superluminal signal propagation for possible causality violations in
Lorentz-invariant field theories.
|
gr-qc astro-ph hep-ph hep-th
|
cosmological scenarios with kessence are invoked in order to explain the observed latetime acceleration of the universe these scenarios avoid the need for finetuned initial conditions the coincidence problem because of the attractorlike dynamics of the kessence field phi it was recently shown that all kessence scenarios with lagrangians plxphi2 necessarily involve an epoch where perturbations of phi propagate faster than light the nogo theorem we carry out a comprehensive study of attractorlike cosmological solutions trackers involving a kessence scalar field phi and another matter component the result of this study is a complete classification of kessence lagrangians that admit asymptotically stable tracking solutions among all lagrangians of the form pkphilx using this classification we select the class of models that describe the latetime acceleration and avoid the coincidence problem through the tracking mechanism an analogous nogo theorem still holds for this class of models indicating the existence of a superluminal epoch in the context of kessence cosmology the superluminal epoch does not lead to causality violations we discuss the implications of superluminal signal propagation for possible causality violations in lorentzinvariant field theories
|
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|
[-0.1696644978802291, 0.10568499478954663, -0.11813445864193842, 0.13315847725350183, -0.13961593432285055, -0.18586616856123203, -0.044578645535005394, 0.3114007358228304, -0.19559902079321073, -0.2855377184299145, 0.04372155772411465, -0.22351238156735734, -0.12151221145273737, 0.15830038979910674, -0.0428390953154689, 0.008034081918635092, 0.04598838098228842, 0.06798048503439647, -0.04593883675249108, -0.26172363709205587, 0.32432454454491316, 0.04589226092237629, 0.2449252933150579, 0.02156197474446168, 0.1213230037449432, -0.047993620442103035, -0.022671855162849742, 0.006119323405565807, -0.14935331992757248, 0.009035778635191777, 0.2108191315475668, 0.19316264891801455, 0.2425417608494011, -0.423719168975126, -0.2782293533319762, 0.22796035536117235, 0.1361821325603893, 0.1395934320759872, -0.06763081520587433, -0.29235426017510296, 0.05917088026232318, -0.1553029496459424, -0.17355286064995093, -0.07103515599207252, -0.012323933131915635, -0.04139578293813444, -0.2420332955186209, 0.13237738407227256, 0.037920595712712786, -0.017835292152196005, -0.09121207269526072, 0.001195927007761861, 0.024024374682703235, 0.013225771991011187, 0.15770656926150933, 0.008595573299085897, 0.11416211816641754, -0.20498927748885562, -0.12865975389105283, 0.4077614952311002, -0.08018834231839739, -0.18317313447018355, 0.16364054023275326, -0.10387398795535381, -0.1872587804013647, 0.12188073857790323, 0.11923848943416934, 0.14130386131048944, -0.14337745000664864, 0.12373594754923506, -0.01639378982086702, 0.1303985528004721, 0.11125096164062331, 0.04984232649729376, 0.2786725947520186, 0.08403933930946565, 0.05435481641373407, 0.07066441648150923, -0.02217277614927197, -0.11613757796849263, -0.412822338181306, -0.1372128465567916, -0.07587431963161406, 0.0626642447678425, -0.11753148921281073, -0.15603330253944372, 0.387173869774435, 0.17115299411385593, 0.13924644759326185, 0.0670632055371444, 0.2425273453883662, 0.07459383117786264, 0.03847706199042211, 0.09882114524052617, 0.3359740157045671, 0.13613386239691827, 0.14243415944041551, -0.22557626393731703, 0.005874620442946303, 0.04871669172654083]
|
706.3995
|
Dynamical instability and dispersion management of an attractive
condensate in an optical lattice
|
We investigate the stability of an attractive Bose-Einstein condensate in a
moving 1D optical lattice in the presence of transverse confinement. By means
of a Bogoliubov linear stability analysis we find that the system is
dynamically unstable for low quasimomenta and becomes stable near the band
edge, in a specular fashion with respect to the repulsive case. For low
interactions the instability occurs via long wavelength excitations that are
not sufficient for spoiling the condensate coherence, producing instead an
oscillating density pattern both in real and momentum space. This behaviour is
illustrated by simulations for the expansion of the condensate in a moving
lattice.
|
cond-mat.other
|
we investigate the stability of an attractive boseeinstein condensate in a moving 1d optical lattice in the presence of transverse confinement by means of a bogoliubov linear stability analysis we find that the system is dynamically unstable for low quasimomenta and becomes stable near the band edge in a specular fashion with respect to the repulsive case for low interactions the instability occurs via long wavelength excitations that are not sufficient for spoiling the condensate coherence producing instead an oscillating density pattern both in real and momentum space this behaviour is illustrated by simulations for the expansion of the condensate in a moving lattice
|
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|
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|
706.3996
|
Phase transitions in higher derivative gravity and gauge theory:
R-charged black holes
|
This is a continuation of our earlier work where we constructed a
phenomenologically motivated effective action of the boundary gauge theory at
finite temperature and finite gauge coupling on $S^3 \times S^1$. In this
paper, we argue that this effective action qualitatively reproduces the gauge
theory representing various bulk phases of R-charged black hole with
Gauss-Bonnet correction. We analyze the system both in canonical and grand
canonical ensemble.
|
hep-th
|
this is a continuation of our earlier work where we constructed a phenomenologically motivated effective action of the boundary gauge theory at finite temperature and finite gauge coupling on s3 times s1 in this paper we argue that this effective action qualitatively reproduces the gauge theory representing various bulk phases of rcharged black hole with gaussbonnet correction we analyze the system both in canonical and grand canonical ensemble
|
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|
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|
706.3997
|
Kondo quantum dot coupled to ferromagnetic leads: Numerical
renormalization group study
|
We systematically study the influence of ferromagnetic leads on the Kondo
resonance in a quantum dot tuned to the local moment regime. We employ Wilson's
numerical renormalization group method, extended to handle leads with a spin
asymmetric density of states, to identify the effects of (i) a finite spin
polarization in the leads (at the Fermi-surface), (ii) a Stoner splitting in
the bands (governed by the band edges) and (iii) an arbitrary shape of the
leads density of states. For a generic lead density of states the quantum dot
favors being occupied by a particular spin-species due to exchange interaction
with ferromagnetic leads leading to a suppression and splitting of the Kondo
resonance. The application of a magnetic field can compensate this asymmetry
restoring the Kondo effect. We study both the gate-voltage dependence (for a
fixed band structure in the leads) and the spin polarization dependence (for
fixed gate voltage) of this compensation field for various types of bands.
Interestingly, we find that the full recovery of the Kondo resonance of a
quantum dot in presence of leads with an energy dependent density of states is
not only possible by an appropriately tuned external magnetic field but also
via an appropriately tuned gate voltage. For flat bands simple formulas for the
splitting of the local level as a function of the spin polarization and gate
voltage are given.
|
cond-mat.mes-hall cond-mat.str-el
|
we systematically study the influence of ferromagnetic leads on the kondo resonance in a quantum dot tuned to the local moment regime we employ wilsons numerical renormalization group method extended to handle leads with a spin asymmetric density of states to identify the effects of i a finite spin polarization in the leads at the fermisurface ii a stoner splitting in the bands governed by the band edges and iii an arbitrary shape of the leads density of states for a generic lead density of states the quantum dot favors being occupied by a particular spinspecies due to exchange interaction with ferromagnetic leads leading to a suppression and splitting of the kondo resonance the application of a magnetic field can compensate this asymmetry restoring the kondo effect we study both the gatevoltage dependence for a fixed band structure in the leads and the spin polarization dependence for fixed gate voltage of this compensation field for various types of bands interestingly we find that the full recovery of the kondo resonance of a quantum dot in presence of leads with an energy dependent density of states is not only possible by an appropriately tuned external magnetic field but also via an appropriately tuned gate voltage for flat bands simple formulas for the splitting of the local level as a function of the spin polarization and gate voltage are given
|
[['we', 'systematically', 'study', 'the', 'influence', 'of', 'ferromagnetic', 'leads', 'on', 'the', 'kondo', 'resonance', 'in', 'a', 'quantum', 'dot', 'tuned', 'to', 'the', 'local', 'moment', 'regime', 'we', 'employ', 'wilsons', 'numerical', 'renormalization', 'group', 'method', 'extended', 'to', 'handle', 'leads', 'with', 'a', 'spin', 'asymmetric', 'density', 'of', 'states', 'to', 'identify', 'the', 'effects', 'of', 'i', 'a', 'finite', 'spin', 'polarization', 'in', 'the', 'leads', 'at', 'the', 'fermisurface', 'ii', 'a', 'stoner', 'splitting', 'in', 'the', 'bands', 'governed', 'by', 'the', 'band', 'edges', 'and', 'iii', 'an', 'arbitrary', 'shape', 'of', 'the', 'leads', 'density', 'of', 'states', 'for', 'a', 'generic', 'lead', 'density', 'of', 'states', 'the', 'quantum', 'dot', 'favors', 'being', 'occupied', 'by', 'a', 'particular', 'spinspecies', 'due', 'to', 'exchange', 'interaction', 'with', 'ferromagnetic', 'leads', 'leading', 'to', 'a', 'suppression', 'and', 'splitting', 'of', 'the', 'kondo', 'resonance', 'the', 'application', 'of', 'a', 'magnetic', 'field', 'can', 'compensate', 'this', 'asymmetry', 'restoring', 'the', 'kondo', 'effect', 'we', 'study', 'both', 'the', 'gatevoltage', 'dependence', 'for', 'a', 'fixed', 'band', 'structure', 'in', 'the', 'leads', 'and', 'the', 'spin', 'polarization', 'dependence', 'for', 'fixed', 'gate', 'voltage', 'of', 'this', 'compensation', 'field', 'for', 'various', 'types', 'of', 'bands', 'interestingly', 'we', 'find', 'that', 'the', 'full', 'recovery', 'of', 'the', 'kondo', 'resonance', 'of', 'a', 'quantum', 'dot', 'in', 'presence', 'of', 'leads', 'with', 'an', 'energy', 'dependent', 'density', 'of', 'states', 'is', 'not', 'only', 'possible', 'by', 'an', 'appropriately', 'tuned', 'external', 'magnetic', 'field', 'but', 'also', 'via', 'an', 'appropriately', 'tuned', 'gate', 'voltage', 'for', 'flat', 'bands', 'simple', 'formulas', 'for', 'the', 'splitting', 'of', 'the', 'local', 'level', 'as', 'a', 'function', 'of', 'the', 'spin', 'polarization', 'and', 'gate', 'voltage', 'are', 'given']]
|
[-0.17776780231475928, 0.1723071912591031, -0.05745894708180506, 0.04601239511005891, -0.018764128767591166, -0.1580298008262425, 0.08348707245890533, 0.3572967269829589, -0.2644855248570246, -0.3104597087576781, 0.006133731094642395, -0.23986076157981237, -0.09868885313258752, 0.15619667134198703, 0.016874491717380966, -0.023694304276560024, -0.014272910555040366, -0.003272483104905277, -0.10979368691991304, -0.17697378386398205, 0.3418462777499052, 0.03211583792877367, 0.29291632370778214, 0.11870700277780231, 0.06301371004583575, 0.05078598616640655, 0.08654566378135585, 0.05087326845489116, -0.09431050449172305, 0.07010329467971531, 0.22108276773743504, -0.06671663275470532, 0.23518763268529846, -0.42761697028069184, -0.15362642285426295, 0.036480885975291595, 0.11598386973370604, 0.1903487107892145, -0.06553642578441404, -0.2899744731186187, 0.045717770113250275, -0.17478823904029764, -0.13038935103523136, -0.08585494426804137, -0.014013311687321811, -0.004902845034130702, -0.3177000729812885, 0.09755566586592754, 0.061685965357658766, 0.05687760468980853, -0.053512497279147635, -0.0699061253679949, -0.052804544335741777, 0.08677247759036968, 0.02518396088016105, 0.03789276099141397, 0.1634124882229228, -0.1380391508915764, -0.12419447263196241, 0.331286928959583, -0.0856380421962393, -0.15615086762128366, 0.140376001941612, -0.17164294857923923, -0.03771739837043641, 0.14311506189589732, 0.12421672355399974, 0.0831845960650785, -0.10023403579901226, 0.13168495901750008, 0.023920968034010576, 0.16384612783848865, 0.02827570400315157, 0.06049511569092334, 0.2538852160582074, 0.1369271075726781, 0.12411374438695993, 0.16918827328022176, -0.15498328076271145, -0.0754655686949008, -0.27919874180990617, -0.12609127846397378, -0.1980339718631289, 0.07699389908603942, -0.06615485016664024, -0.2013250331173798, 0.49230060026074124, 0.12209010011671732, 0.22821831042886498, -0.03262910366123706, 0.23922748507302777, 0.20133340336421193, 0.08572372561320662, 0.027847472755973667, 0.2273735877988337, 0.18873869204023658, 0.054629297189724944, -0.34405768466623204, 0.04339094796568245, -0.02379458818253816]
|
706.3998
|
Fluctuation Effects on R_pA at High Energy
|
We discuss a new physical phenomenon for R_pA in the fixed coupling case, the
total gluon shadowing, which arises due to the effect of gluon number
fluctuations.
|
hep-ph
|
we discuss a new physical phenomenon for r_pa in the fixed coupling case the total gluon shadowing which arises due to the effect of gluon number fluctuations
|
[['we', 'discuss', 'a', 'new', 'physical', 'phenomenon', 'for', 'r_pa', 'in', 'the', 'fixed', 'coupling', 'case', 'the', 'total', 'gluon', 'shadowing', 'which', 'arises', 'due', 'to', 'the', 'effect', 'of', 'gluon', 'number', 'fluctuations']]
|
[-0.17070100290907753, 0.2423387666888259, -0.126325653107078, 0.15518436146279177, -0.0573807444371697, -0.030130138189566356, 0.029735240947317193, 0.2763796261063329, -0.2649918104763384, -0.23757488211547886, -0.015211050316725892, -0.24629101415889132, -0.10811026242596132, 0.10784325479633278, -0.04967934865918425, 0.030579000987388468, -0.01314545257223977, -0.0011634325125703105, 0.0013721056705064795, -0.19862191825760184, 0.41523750595472475, 0.04696283646087438, 0.2570868152435179, 0.2445648126994018, 0.10960449030001958, 0.09102066473483487, -0.03839631744281009, 0.010941652374135124, -0.10294807195249531, -0.0010637883096933365, 0.14892540872097015, -0.001907572012256693, 0.2284644858704673, -0.3455696735117171, -0.20803014195903582, 0.14631343532905536, 0.12233634744943292, 0.15546827095440002, -0.04896057452316637, -0.17768078724232814, 0.035382739475203887, -0.25563294302534173, -0.2118000287424635, -0.02848287623513628, 0.019010738435166853, -0.037253917539837186, -0.34009366837778576, 0.08875134882206719, 0.004018395311302609, 0.004070663514236609, 0.033356633244289294, -0.1670791825486554, -0.02829549558184765, 0.08192462981161144, 0.16144487848160444, 0.052844374975258554, 0.1828573062946951, -0.2487937058839533, -0.09957483609172481, 0.4065453498451798, -0.0392209988915258, -0.18887584849801864, 0.16688398240755, -0.19987627556892457, -0.15941104724037428, 0.1665617052845105, 0.23220354751511305, 0.05041794770362752, -0.12372462065131576, 0.08201435509275783, -0.04256626059887586, 0.13062835815880033, 0.07766282361828619, 0.16695207247027644, 0.16928123324005692, 0.15413814990056884, 0.03610896203597939, 0.2125889645130546, -0.11747497375364657, -0.11877107037300313, -0.37280641082260346, -0.04541964808271991, -0.11613507189408497, 0.09471938245136428, -0.14240205717376536, -0.1261919073898483, 0.3486337627939604, 0.17596474752106048, 0.24541381220505745, -0.024210266298959376, 0.29696548371403303, 0.16717498107916778, 0.07930635229718906, 0.04596585218139269, 0.2794392909164782, 0.21639046128149386, 0.13136251429440798, -0.3247335927078017, 0.03381059810312258, 0.049589826759916765]
|
706.3999
|
On Matrix Superpotential and Three-Component Normal Modes
|
We consider the supersymmetric quantum mechanics (SUSY QM) with three-
component normal modes for the Bogomol'nyi-Prasad-Sommerfield (BPS) states. An
explicit form of the SUSY QM matrix superpotential is presented and the
corresponding three-component bosonic zero-mode eigenfunction is investigated.
|
hep-th
|
we consider the supersymmetric quantum mechanics susy qm with three component normal modes for the bogomolnyiprasadsommerfield bps states an explicit form of the susy qm matrix superpotential is presented and the corresponding threecomponent bosonic zeromode eigenfunction is investigated
|
[['we', 'consider', 'the', 'supersymmetric', 'quantum', 'mechanics', 'susy', 'qm', 'with', 'three', 'component', 'normal', 'modes', 'for', 'the', 'bogomolnyiprasadsommerfield', 'bps', 'states', 'an', 'explicit', 'form', 'of', 'the', 'susy', 'qm', 'matrix', 'superpotential', 'is', 'presented', 'and', 'the', 'corresponding', 'threecomponent', 'bosonic', 'zeromode', 'eigenfunction', 'is', 'investigated']]
|
[-0.1292585378855859, 0.22021113578145896, -0.015506539175188854, 0.14295349581975883, -0.03608355140558591, -0.2157781580217967, -0.07767373435566888, 0.2693929106095119, -0.1212191137877342, -0.1901255017636638, 0.01762097379756405, -0.2989925213378707, -0.1400518449219434, 0.03898357800943287, 0.00011806890956665341, 0.13428379021781056, 0.012234744891573331, 0.09010347522991269, -0.08007471270761207, -0.18996478620254875, 0.3178340501832089, -0.07265717981346442, 0.23144667203489103, 0.025847102760484342, 0.06378492933550947, -0.014095754852812541, 0.07828690082226929, -0.13239894143158668, -0.13290600900195146, 0.13489932446636407, 0.2475411304713864, 0.06880612240025871, 0.07757737994880269, -0.44307426549494267, -0.17311155979864692, 0.1510687602046681, 0.18017247963794752, 0.14430057845617594, 0.002124968646584373, -0.3219354738922496, 0.011091774666534835, -0.18684813399848185, -0.19083132418362717, -0.09573548545105089, 0.008828214908901014, -0.22590198681542747, -0.24525132119704626, 0.16229655120217726, -0.009170831046312264, 0.040793783791167174, -0.020252054655238202, -0.16314275968991415, -0.08923837449401617, -0.004213615590216298, 0.056883165291142894, -0.07690384422772024, 0.13737645767564813, -0.19678354106451335, -0.1650073512604362, 0.3951343373076892, 0.014823410243384148, -0.2856883700740965, 0.07140958956197689, -0.07244250933198552, -0.15786046189206995, 0.09920170913009267, 0.02096132468432188, 0.09471626344480012, -0.10521662017134459, 0.26727234076947515, -0.06518329591735413, 0.16450140831109725, 0.07603702150089175, 0.05727450076588675, 0.2725599754209581, 0.08834547594826865, -0.013670924756872026, 0.16153648730955625, -0.02338192025873516, -0.22318672976995768, -0.5002935996377155, -0.21792052752387367, -0.16766481628445418, 0.096955125122086, -0.07165880621323595, -0.19515771763154158, 0.4397459149936606, 0.004907764813029452, 0.16556331234689997, 0.044867060318785276, 0.18628008221276104, 0.1974910717261465, 0.012767990683450511, 0.03288194980766428, 0.2747712151980714, 0.18880901527345964, 0.049436763223064575, -0.31461470017797855, -0.22550961726933325, 0.20294175876647627]
|
706.4
|
Effective field theory and cold Fermi gases near unitary limit
|
We study a dynamics of ultracold Fermi-gases near the unitary limit in the
framework of Effective Field Theory. It is shown that, while one can obtain a
reasonable description of the universal proportionality constant both in the
narrow and the broad Feshbach resonance limits, the reguirement of the
reparametrisation invariance leads to appearance of the three body forces
needed to cancel the otherwise arising off-shell uncertainties. The size of the
unsertainties is estimated.
|
cond-mat.supr-con nucl-th
|
we study a dynamics of ultracold fermigases near the unitary limit in the framework of effective field theory it is shown that while one can obtain a reasonable description of the universal proportionality constant both in the narrow and the broad feshbach resonance limits the reguirement of the reparametrisation invariance leads to appearance of the three body forces needed to cancel the otherwise arising offshell uncertainties the size of the unsertainties is estimated
|
[['we', 'study', 'a', 'dynamics', 'of', 'ultracold', 'fermigases', 'near', 'the', 'unitary', 'limit', 'in', 'the', 'framework', 'of', 'effective', 'field', 'theory', 'it', 'is', 'shown', 'that', 'while', 'one', 'can', 'obtain', 'a', 'reasonable', 'description', 'of', 'the', 'universal', 'proportionality', 'constant', 'both', 'in', 'the', 'narrow', 'and', 'the', 'broad', 'feshbach', 'resonance', 'limits', 'the', 'reguirement', 'of', 'the', 'reparametrisation', 'invariance', 'leads', 'to', 'appearance', 'of', 'the', 'three', 'body', 'forces', 'needed', 'to', 'cancel', 'the', 'otherwise', 'arising', 'offshell', 'uncertainties', 'the', 'size', 'of', 'the', 'unsertainties', 'is', 'estimated']]
|
[-0.14977478854272935, 0.15349340946479162, -0.09323553800462397, 0.07424749694043167, -0.03293140967127303, -0.1147355766127437, 0.03177139883808477, 0.31802589984112223, -0.25371996232662614, -0.28784127623944633, 0.05195103426673778, -0.24177715586314738, -0.0990788486563194, 0.14761431037750042, -0.017785738097687423, 0.06532480463411816, 0.026007740889531627, 0.07643210865609662, -0.07766234612053025, -0.1787699476986284, 0.30186489291659646, 0.04212356479444974, 0.2785956667290187, 0.11416165132574002, 0.11353649458074024, 0.011312721930050723, 0.012309662833757383, 0.0050053389752808385, -0.13058434739353506, 0.1441393569636513, 0.22033117196693178, 0.05038522274260455, 0.21055068282632267, -0.39134627053330484, -0.19740284925562815, 0.0939489279506387, 0.15222532925537038, 0.15715382515426568, 0.03063279918959023, -0.26855910908181585, 0.025281234093430176, -0.15454276952840074, -0.1852970996241964, -0.08870870284211467, 0.01886857234918788, -0.04099268944110905, -0.26918032412535287, 0.06163151725974183, 0.08373725900924961, 0.025370678379082343, -0.07890201189463407, -0.06352625063187639, 0.033551609222318084, 0.13070525259802668, 0.08022932621033889, 0.02923066725521545, 0.17832802983761672, -0.18969193339086213, -0.05084381718188524, 0.4145867578475408, -0.10529614103512025, -0.16093581434811505, 0.1943764922809197, -0.17310126001198947, -0.08510907795804908, 0.16966434538652989, 0.13706224734081665, 0.09947542843907337, -0.166929736840014, 0.14520712355463306, -0.050191108930960925, 0.1406343540366949, 0.04063087200719706, 0.049574365072004814, 0.20912140027068976, 0.11541756133640736, 0.04939457190446031, 0.12097192616005178, -0.09654959183658512, -0.14634156534054749, -0.35825986024254647, -0.09897355059765174, -0.13968210169573275, 0.03445655245228972, -0.08083458864896617, -0.15063372590951293, 0.3864921238535727, 0.1518205194078176, 0.2443465709155032, 0.01601093662509196, 0.27232169386156846, 0.16533806556704597, 0.09878001094821998, 0.024263834561103245, 0.312410051632725, 0.16689574728969117, 0.011930429970215954, -0.30010003046932776, 0.018675835311255405, 0.032529225651647]
|
706.4001
|
Pseudo-Quantum Criticality in Electron Liquids Exhibited in Expanded
Alkali Metals
|
With paying special attention to the divergence in the compressibility
$\kappa$, we study the Coulombic screening in alkali metals to find singular
long-range fluctuations in the electronic polarization originating from this
divergence. As a consequence of this singularity, we predict the decrease of
the equilibration distance between ions against the increase of $r_s$ the
Wigner-Seitz radius of valence electrons, provided that the condition of $2r_c
< r_s < 4r_c$ is satisfied with $r_c$ the ion-core radius. This prediction is
in good quantitative agreement with the recent experiment on liquid Rb.
|
cond-mat.other cond-mat.mtrl-sci
|
with paying special attention to the divergence in the compressibility kappa we study the coulombic screening in alkali metals to find singular longrange fluctuations in the electronic polarization originating from this divergence as a consequence of this singularity we predict the decrease of the equilibration distance between ions against the increase of r_s the wignerseitz radius of valence electrons provided that the condition of 2r_c r_s 4r_c is satisfied with r_c the ioncore radius this prediction is in good quantitative agreement with the recent experiment on liquid rb
|
[['with', 'paying', 'special', 'attention', 'to', 'the', 'divergence', 'in', 'the', 'compressibility', 'kappa', 'we', 'study', 'the', 'coulombic', 'screening', 'in', 'alkali', 'metals', 'to', 'find', 'singular', 'longrange', 'fluctuations', 'in', 'the', 'electronic', 'polarization', 'originating', 'from', 'this', 'divergence', 'as', 'a', 'consequence', 'of', 'this', 'singularity', 'we', 'predict', 'the', 'decrease', 'of', 'the', 'equilibration', 'distance', 'between', 'ions', 'against', 'the', 'increase', 'of', 'r_s', 'the', 'wignerseitz', 'radius', 'of', 'valence', 'electrons', 'provided', 'that', 'the', 'condition', 'of', '2r_c', 'r_s', '4r_c', 'is', 'satisfied', 'with', 'r_c', 'the', 'ioncore', 'radius', 'this', 'prediction', 'is', 'in', 'good', 'quantitative', 'agreement', 'with', 'the', 'recent', 'experiment', 'on', 'liquid', 'rb']]
|
[-0.11220387244415095, 0.14936097533624063, -0.06478442438482039, 0.059226062061832466, 0.021564145133584397, -0.12721413212839042, 0.05989287642697836, 0.3183937795545863, -0.22791213791110906, -0.25586764927653743, -0.013047662087255853, -0.39403150826103817, -0.06643851022450147, 0.10508744835040007, -0.026553276594428497, 0.012175397406835323, 0.028802582573937786, 0.049598627830802024, -0.1440373767694544, -0.17683503805156583, 0.2804494437851258, 0.11470545425839808, 0.2682379347368561, 0.14790833907351755, -0.0007105078548192978, 0.011286209370196936, 0.06019493152558718, 0.05830931957896756, -0.20024160215747877, 0.07724188680321663, 0.21490533298802103, -0.0060008405975397975, 0.23451081855723035, -0.40807380998271636, -0.21202177912981687, 0.06858801488475554, 0.09564468123476375, 0.11328938399206033, -0.06505372506116741, -0.23337636476425433, 0.025460635782915287, -0.18311772495508194, -0.17703017557104087, -0.04029813513759224, 0.04968523330472667, 0.030181792339553586, -0.27749763504098884, 0.17735064094993233, 0.03590671135241102, 0.07920335945352142, -0.06167530046840166, -0.13022295498133948, -0.020584533440655674, 0.06243306735059482, 0.12280994734523454, 0.07822307285949073, 0.15607823205619364, -0.10348075494469924, -0.004002460936919369, 0.39330318246047474, -0.08408539554896369, -0.12099273430836525, 0.15541321498973446, -0.21535985115059147, -0.04845109036534853, 0.12328326818667053, 0.1212879076664304, 0.08164716773163314, -0.07148444525169573, 0.06813369133648858, -0.03676035862292923, 0.16921996874948855, 0.09372631099674551, 0.054991718867961614, 0.21673421169920215, 0.17145514331394057, 0.013446651388430732, 0.14154774164673925, -0.10782507952485346, -0.10179974397259026, -0.3000395170830447, -0.1434584245856466, -0.2049154035168989, 0.03732979855360998, -0.1232139149509456, -0.1925912758271242, 0.3282061704680666, 0.14232136803711282, 0.22269875110908485, -0.010413590589827248, 0.259057549652697, 0.07532272484533531, 0.07763015535585154, 0.048461418149286305, 0.31058017314336767, 0.15727875494109145, 0.08881245570888893, -0.3270692706466706, 0.06126761326871427, 0.0557683309133368]
|
706.4002
|
Local results for flows whose speed or height satisfies a bound of the
form $\frac c t$
|
In this paper we prove local results for solutions to the Ricci flow (heat
flow) whose speed (height) is bounded by $\frac c t$ for some time interval $ t
\in (0,T)$. These results are contained in chapter 7 of the author's
habilitation thesis, University of Freiburg, Germany, 2006.
|
math.DG
|
in this paper we prove local results for solutions to the ricci flow heat flow whose speed height is bounded by frac c t for some time interval t in 0t these results are contained in chapter 7 of the authors habilitation thesis university of freiburg germany 2006
|
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|
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|
706.4003
|
Shot noise in the interacting resonance level model
|
The shot noise power and the Fano factor of a spinless resonant level model
is calculated. The Coulomb interaction which in this model acts between the
lead electron and the impurity is considered in the first order approximation.
The logarithmic divergencies which appeared in the expressions for shot noise
and the transport current are removed by renormalization group analysis. It is
shown that Keldysh technique gives an adequate description of perturbation
theory results. By passing to the bosonized form of the resonance model it is
proven that in the strong interaction limit the tunnelling becomes irrelevant
and decreases.
|
cond-mat.str-el
|
the shot noise power and the fano factor of a spinless resonant level model is calculated the coulomb interaction which in this model acts between the lead electron and the impurity is considered in the first order approximation the logarithmic divergencies which appeared in the expressions for shot noise and the transport current are removed by renormalization group analysis it is shown that keldysh technique gives an adequate description of perturbation theory results by passing to the bosonized form of the resonance model it is proven that in the strong interaction limit the tunnelling becomes irrelevant and decreases
|
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|
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|
706.4004
|
End-to-End Available Bandwidth Measurement Tools : A Comparative
Evaluation of Performances
|
In recent years, there has been a strong interest in measuring the available
bandwidth of network paths. Several methods and techniques have been proposed
and various measurement tools have been developed and evaluated. However, there
have been few comparative studies with regards to the actual performance of
these tools. This paper presents a study of available bandwidth measurement
techniques and undertakes a comparative analysis in terms of accuracy,
intrusiveness and response time of active probing tools. Finally, measurement
errors and the uncertainty of the tools are analysed and overall conclusions
made.
|
cs.NI
|
in recent years there has been a strong interest in measuring the available bandwidth of network paths several methods and techniques have been proposed and various measurement tools have been developed and evaluated however there have been few comparative studies with regards to the actual performance of these tools this paper presents a study of available bandwidth measurement techniques and undertakes a comparative analysis in terms of accuracy intrusiveness and response time of active probing tools finally measurement errors and the uncertainty of the tools are analysed and overall conclusions made
|
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|
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|
706.4005
|
Absolute frequency measurements for hyperfine structure determination of
the R(26) 62-0 transition at 501.7 nm in molecular iodine
|
The absolute frequencies of the hyperfine components of the R(26) 62-0
transition in molecular iodine at 501.7 nm are measured for the first time with
an optical clockwork based on a femtosecond laser frequency comb generator. The
set-up is composed of an Ar+ laser locked to a hyperfine component of the R(26)
62-0 transition detected in a continuously pumped low-pressure cell (0.33 Pa).
The detected resonances show a linewidth of 45 kHz (half-width at
half-maximum). The uncertainty of the frequency measurement is estimated to be
250 Hz.
|
physics.atom-ph
|
the absolute frequencies of the hyperfine components of the r26 620 transition in molecular iodine at 5017 nm are measured for the first time with an optical clockwork based on a femtosecond laser frequency comb generator the setup is composed of an ar laser locked to a hyperfine component of the r26 620 transition detected in a continuously pumped lowpressure cell 033 pa the detected resonances show a linewidth of 45 khz halfwidth at halfmaximum the uncertainty of the frequency measurement is estimated to be 250 hz
|
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|
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|
706.4006
|
Gutzwiller's Trace Formula and Vacuum Pair Production
|
We propose a new application of the Gutzwiller trace formula formalism, to
give a compact expression for the semiclassical vacuum pair production rate in
quantum electrodynamics, for general inhomogeneous electromagnetic background
fields.
|
hep-th
|
we propose a new application of the gutzwiller trace formula formalism to give a compact expression for the semiclassical vacuum pair production rate in quantum electrodynamics for general inhomogeneous electromagnetic background fields
|
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|
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|
706.4007
|
Transmission des forces dans un milieu compos\'e de grains non
sph\'eriques
|
We perform a detailed analysis of the contact force network in a dense
confined packing of pentagonal particles simulated by means of the contact
dynamics method. The effect of particle shape is evidenced by comparing the
data from pentagon packing and from a packing with identical characteristics
except for the circular shape of the particles. A counterintuitive finding of
this work is that, under steady shearing, the pentagon packing develops a lower
structural anisotropy than the disk packing. We show that this weakness is
compensated by a higher force anisotropy, leading to enhanced shear strength of
the pentagon packing. We revisit "strong" and "weak" force networks in the
pentagon packing, but our simulation data provide also evidence for a large
class of "very weak" forces carried mainly by vertex-to-edge contacts. The
strong force chains are mostly composed of edge-to-edge contacts with a marked
zig-zag aspect and a decreasing exponential probability distribution as in a
disk packing.
|
physics.class-ph
|
we perform a detailed analysis of the contact force network in a dense confined packing of pentagonal particles simulated by means of the contact dynamics method the effect of particle shape is evidenced by comparing the data from pentagon packing and from a packing with identical characteristics except for the circular shape of the particles a counterintuitive finding of this work is that under steady shearing the pentagon packing develops a lower structural anisotropy than the disk packing we show that this weakness is compensated by a higher force anisotropy leading to enhanced shear strength of the pentagon packing we revisit strong and weak force networks in the pentagon packing but our simulation data provide also evidence for a large class of very weak forces carried mainly by vertextoedge contacts the strong force chains are mostly composed of edgetoedge contacts with a marked zigzag aspect and a decreasing exponential probability distribution as in a disk packing
|
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|
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|
706.4008
|
Conserved Matter Superenergy Currents for Orthogonally Transitive
Abelian G2 Isometry Groups
|
In a previous paper we showed that the electromagnetic superenergy tensor,
the Chevreton tensor, gives rise to a conserved current when there is a
hypersurface orthogonal Killing vector present. In addition, the current is
proportional to the Killing vector. The aim of this paper is to extend this
result to the case when we have a two-parameter Abelian isometry group that
acts orthogonally transitive on non-null surfaces. It is shown that for
four-dimensional Einstein-Maxwell theory with a source-free electromagnetic
field, the corresponding superenergy currents lie in the orbits of the group
and are conserved. A similar result is also shown to hold for the trace of the
Chevreton tensor and for the Bach tensor, and also in Einstein-Klein-Gordon
theory for the superenergy of the scalar field. This links up well with the
fact that the Bel tensor has these properties and the possibility of
constructing conserved mixed currents between the gravitational field and the
matter fields.
|
gr-qc
|
in a previous paper we showed that the electromagnetic superenergy tensor the chevreton tensor gives rise to a conserved current when there is a hypersurface orthogonal killing vector present in addition the current is proportional to the killing vector the aim of this paper is to extend this result to the case when we have a twoparameter abelian isometry group that acts orthogonally transitive on nonnull surfaces it is shown that for fourdimensional einsteinmaxwell theory with a sourcefree electromagnetic field the corresponding superenergy currents lie in the orbits of the group and are conserved a similar result is also shown to hold for the trace of the chevreton tensor and for the bach tensor and also in einsteinkleingordon theory for the superenergy of the scalar field this links up well with the fact that the bel tensor has these properties and the possibility of constructing conserved mixed currents between the gravitational field and the matter fields
|
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|
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|
706.4009
|
Multi-criteria scheduling of pipeline workflows
|
Mapping workflow applications onto parallel platforms is a challenging
problem, even for simple application patterns such as pipeline graphs. Several
antagonist criteria should be optimized, such as throughput and latency (or a
combination). In this paper, we study the complexity of the bi-criteria mapping
problem for pipeline graphs on communication homogeneous platforms. In
particular, we assess the complexity of the well-known chains-to-chains problem
for different-speed processors, which turns out to be NP-hard. We provide
several efficient polynomial bi-criteria heuristics, and their relative
performance is evaluated through extensive simulations.
|
cs.DC
|
mapping workflow applications onto parallel platforms is a challenging problem even for simple application patterns such as pipeline graphs several antagonist criteria should be optimized such as throughput and latency or a combination in this paper we study the complexity of the bicriteria mapping problem for pipeline graphs on communication homogeneous platforms in particular we assess the complexity of the wellknown chainstochains problem for differentspeed processors which turns out to be nphard we provide several efficient polynomial bicriteria heuristics and their relative performance is evaluated through extensive simulations
|
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|
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|
706.401
|
Quantum toy model for black-hole back-reaction
|
We propose a simple quantum field theoretical toy model for black hole
evaporation and study the back-reaction of Hawking radiation onto the classical
background. It turns out that the horizon is also ``pushed back'' in this
situation (i.e., the interior region shrinks) but this back-reaction is not
caused by energy conservation but by momentum balance. The effective heat
capacity and the induced entropy variation can have both signs -- depending on
the parameters of the model. PACS: 04.62.+v, 04.70.Dy.
|
gr-qc
|
we propose a simple quantum field theoretical toy model for black hole evaporation and study the backreaction of hawking radiation onto the classical background it turns out that the horizon is also pushed back in this situation ie the interior region shrinks but this backreaction is not caused by energy conservation but by momentum balance the effective heat capacity and the induced entropy variation can have both signs depending on the parameters of the model pacs 0462v 0470dy
|
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|
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|
706.4011
|
Determination of density and concentration from fluorescent images of a
gas flow
|
A fluorescent image analysis procedure to determine the distribution of
species concentration and density in a gas flow is proposed. The fluorescent
emission is due to the excitation of atoms/molecules of a gas that is
intercepted by an electron blade. The intensity of the fluorescent light is
proportional to the local number density of the gas. When the gas flow is a
mixture of different species, this proportionality can be exploited to extract
the contribution associated to the species from the spectral superposition
acquired by a digital camera. This yields a method that simultaneously reveals
species concentrations and mass density of the mixture. The procedure is
applied to two under-expanded sonic jets discharged into a different gas
ambient - Helium into Argon and Argon into Helium - to measure the
concentration and density distribution along the jet axis and across it. A
comparison with experimental and numerical results obtained by other authors
when observing under-expanded jets at different Mach numbers is made with the
density distribution along the axis of the jet. This density distribution
appears to be self-similar.
|
physics.flu-dyn
|
a fluorescent image analysis procedure to determine the distribution of species concentration and density in a gas flow is proposed the fluorescent emission is due to the excitation of atomsmolecules of a gas that is intercepted by an electron blade the intensity of the fluorescent light is proportional to the local number density of the gas when the gas flow is a mixture of different species this proportionality can be exploited to extract the contribution associated to the species from the spectral superposition acquired by a digital camera this yields a method that simultaneously reveals species concentrations and mass density of the mixture the procedure is applied to two underexpanded sonic jets discharged into a different gas ambient helium into argon and argon into helium to measure the concentration and density distribution along the jet axis and across it a comparison with experimental and numerical results obtained by other authors when observing underexpanded jets at different mach numbers is made with the density distribution along the axis of the jet this density distribution appears to be selfsimilar
|
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|
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|
706.4012
|
Existence of mesons after deconfinement
|
We investigate the possibility for a quark-antiquark pair to form a bound
state at temperatures higher than the critical one ($T>T_c$), thus after
deconfinement. Our main goal is to find analytical criteria constraining the
existence of such mesons. Our formalism relies on a Schr\"{o}dinger equation
for which we study the physical consequences of both using the free energy and
the internal energy as potential term, assuming a widely accepted
temperature-dependent Yukawa form for the free energy and a recently proposed
nonperturbative form for the screening mass. We show that using the free energy
only allows for the 1S bottomonium to be bound above $T_c$, with a dissociation
temperature around $1.5\times T_c$. The situation is very different with the
internal energy, where we show that no bound states at all can exist in the
deconfined phase. But, in this last case, quasi-bound states could be present
at higher temperatures because of a positive barrier appearing in the
potential.
|
hep-ph
|
we investigate the possibility for a quarkantiquark pair to form a bound state at temperatures higher than the critical one tt_c thus after deconfinement our main goal is to find analytical criteria constraining the existence of such mesons our formalism relies on a schrodinger equation for which we study the physical consequences of both using the free energy and the internal energy as potential term assuming a widely accepted temperaturedependent yukawa form for the free energy and a recently proposed nonperturbative form for the screening mass we show that using the free energy only allows for the 1s bottomonium to be bound above t_c with a dissociation temperature around 15times t_c the situation is very different with the internal energy where we show that no bound states at all can exist in the deconfined phase but in this last case quasibound states could be present at higher temperatures because of a positive barrier appearing in the potential
|
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|
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|
706.4013
|
A Chandra Study of the Lobe/ISM Interactions Around the Inner Radio
Lobes of Centaurus A: Constraints on the Temperature Structure and Transport
Processes
|
We present results from deeper {\em Chandra} observations of the southwest
radio lobe of Centaurus A, first described by Kraft et al. (2003). We find that
the sharp X-ray surface brightness discontinuity extends around $\sim$75% of
the periphery of the radio lobe, and detect significant temperature jumps in
the brightest regions of this discontinuity nearest to the nucleus. This
demonstrates that this discontinuity is indeed a strong shock which is the
result of an overpressure which has built up in the entire lobe over time.
Additionally, we demonstrate that if the mean free path for ions to transfer
energy and momentum to the electrons behind the shock is as large as the
Spitzer value, the electron and proton temperatures will not have equilibrated
along the SW boundary of the radio lobe where the shock is strongest. Thus the
proton temperature of the shocked gas could be considerably larger than the
observed electron temperature, and the total energy of the outburst
correspondingly larger as well. We investigate this using a simple
one-dimensional shock model for a two-fluid (proton/electron) plasma. We find
that for the thermodynamic parameters of the Cen A shock the electron
temperature rises rapidly from $\sim$0.29 keV (the temperature of the ambient
ISM) to $\sim$3.5 keV at which point heating from the protons is balanced by
adiabatic losses. The proton and electron temperatures do not equilibrate in a
timescale less than the age of the lobe. We note that the measured electron
temperature of similar features in other nearby powerful radio galaxies in poor
environments may considerably underestimate the strength and velocity of the
shock.
|
astro-ph
|
we present results from deeper em chandra observations of the southwest radio lobe of centaurus a first described by kraft et al 2003 we find that the sharp xray surface brightness discontinuity extends around sim75 of the periphery of the radio lobe and detect significant temperature jumps in the brightest regions of this discontinuity nearest to the nucleus this demonstrates that this discontinuity is indeed a strong shock which is the result of an overpressure which has built up in the entire lobe over time additionally we demonstrate that if the mean free path for ions to transfer energy and momentum to the electrons behind the shock is as large as the spitzer value the electron and proton temperatures will not have equilibrated along the sw boundary of the radio lobe where the shock is strongest thus the proton temperature of the shocked gas could be considerably larger than the observed electron temperature and the total energy of the outburst correspondingly larger as well we investigate this using a simple onedimensional shock model for a twofluid protonelectron plasma we find that for the thermodynamic parameters of the cen a shock the electron temperature rises rapidly from sim029 kev the temperature of the ambient ism to sim35 kev at which point heating from the protons is balanced by adiabatic losses the proton and electron temperatures do not equilibrate in a timescale less than the age of the lobe we note that the measured electron temperature of similar features in other nearby powerful radio galaxies in poor environments may considerably underestimate the strength and velocity of the shock
|
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|
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|
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