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706.1714
|
Theory of nonlinear particle acceleration at shocks and self-generation
of the magnetic field
|
We present some recent developments in the theory of particle acceleration at
shock fronts in the presence of dynamical reaction of the accelerated particles
and self-generation of magnetic field due to streaming instability. The spectra
of accelerated particles, the velocity, magnetic field and temperature profiles
can be calculated in this approach anywhere in the precursor and in the
downstream region. The implications for the origin of cosmic rays and for the
phenomenology of supernova remnants will be discussed.
|
astro-ph
|
we present some recent developments in the theory of particle acceleration at shock fronts in the presence of dynamical reaction of the accelerated particles and selfgeneration of magnetic field due to streaming instability the spectra of accelerated particles the velocity magnetic field and temperature profiles can be calculated in this approach anywhere in the precursor and in the downstream region the implications for the origin of cosmic rays and for the phenomenology of supernova remnants will be discussed
|
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|
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|
706.1715
|
Search for correlation of UHECRs and BL Lacs in Pierre Auger Observatory
data
|
Several analyses of the data collected by other experiments have found an
excess of cosmic rays in correlation with subclasses of BL Lacs. Data from the
Pierre Auger Observatory do not support previously reported excesses. The
number of events correlated with BL Lac positions is compatible with that
expected for an isotropic flux.
|
astro-ph
|
several analyses of the data collected by other experiments have found an excess of cosmic rays in correlation with subclasses of bl lacs data from the pierre auger observatory do not support previously reported excesses the number of events correlated with bl lac positions is compatible with that expected for an isotropic flux
|
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|
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|
706.1716
|
Modeling and analysis using hybrid Petri nets
|
This paper is devoted to the use of hybrid Petri nets (PNs) for modeling and
control of hybrid dynamic systems (HDS). Modeling, analysis and control of HDS
attract ever more of researchers' attention and several works have been devoted
to these topics. We consider in this paper the extensions of the PN formalism
(initially conceived for modeling and analysis of discrete event systems) in
the direction of hybrid modeling. We present, first, the continuous PN models.
These models are obtained from discrete PNs by the fluidification of the
markings. They constitute the first steps in the extension of PNs toward hybrid
modeling. Then, we present two hybrid PN models, which differ in the class of
HDS they can deal with. The first one is used for deterministic HDS modeling,
whereas the second one can deal with HDS with nondeterministic behavior.
Keywords: Hybrid dynamic systems; D-elementary hybrid Petri nets; Hybrid
automata; Controller synthesis
|
cs.IT math.IT
|
this paper is devoted to the use of hybrid petri nets pns for modeling and control of hybrid dynamic systems hds modeling analysis and control of hds attract ever more of researchers attention and several works have been devoted to these topics we consider in this paper the extensions of the pn formalism initially conceived for modeling and analysis of discrete event systems in the direction of hybrid modeling we present first the continuous pn models these models are obtained from discrete pns by the fluidification of the markings they constitute the first steps in the extension of pns toward hybrid modeling then we present two hybrid pn models which differ in the class of hds they can deal with the first one is used for deterministic hds modeling whereas the second one can deal with hds with nondeterministic behavior keywords hybrid dynamic systems delementary hybrid petri nets hybrid automata controller synthesis
|
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|
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|
706.1717
|
Comment on the paper by Rovelli & al. about the compatibility of various
"gauge conditions"
|
The compatibility "demonstrated" by Rovelli & al. between various "gauge
conditions" both in Classical Electromagnetism and General Relativity can be
better understood if one distinguishes "gauge conditions" of the solution type
and "gauge conditions" of the constraint type.
|
physics.class-ph
|
the compatibility demonstrated by rovelli al between various gauge conditions both in classical electromagnetism and general relativity can be better understood if one distinguishes gauge conditions of the solution type and gauge conditions of the constraint type
|
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|
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|
706.1718
|
The Strehl Ratio in Adaptive Optics Images: Statistics and Estimation
|
Statistical properties of the intensity in adaptive optics images are usually
modeled with a Rician distribution. We study the central point of the image,
where this model is inappropriate for high to very high correction levels. The
central point is an important problem because it gives the Strehl ratio
distribution. We show that the central point distribution can be modeled using
a non-central Gamma distribution.
|
astro-ph
|
statistical properties of the intensity in adaptive optics images are usually modeled with a rician distribution we study the central point of the image where this model is inappropriate for high to very high correction levels the central point is an important problem because it gives the strehl ratio distribution we show that the central point distribution can be modeled using a noncentral gamma distribution
|
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|
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|
706.1719
|
Systematic study of atmosphere-induced influences and uncertainties on
shower reconstruction at the Pierre Auger Observatory
|
A wide range of atmospheric monitoring instruments is employed at the Pierre
Auger Observatory: two laser facilities, elastic lidar stations, aerosol phase
function monitors, a horizontal attenuation monitor, star monitors, weather
stations, and balloon soundings. We describe the impact of analyzed atmospheric
data on the accuracy of shower reconstructions, and in particular study the
effect of the data on the shower energy and the depth of shower maximum (Xmax).
These effects have been studied using the subset of golden hybrid events -
events observed with high quality in the fluorescence and surface detector -
used in the calibration of the surface detector energy spectrum.
|
astro-ph
|
a wide range of atmospheric monitoring instruments is employed at the pierre auger observatory two laser facilities elastic lidar stations aerosol phase function monitors a horizontal attenuation monitor star monitors weather stations and balloon soundings we describe the impact of analyzed atmospheric data on the accuracy of shower reconstructions and in particular study the effect of the data on the shower energy and the depth of shower maximum xmax these effects have been studied using the subset of golden hybrid events events observed with high quality in the fluorescence and surface detector used in the calibration of the surface detector energy spectrum
|
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|
[-0.09504764305208535, 0.1902814902383469, -0.07967327184993409, 0.10781650100497976, -0.003930910351211387, -0.012979856363552459, 0.005139551451886255, 0.4240405290734534, -0.18894106197152652, -0.4123383842627792, 0.08716993155437247, -0.3594758939637127, -0.05339939427543797, 0.22294688668996826, -0.035740898355987726, 0.12704795240150654, 0.15892473159029202, -0.030406062397649328, -0.03055130046627977, -0.15284139108752795, 0.23161337373540827, 0.20154696784219614, 0.32059085989991826, 0.07856670084098975, 0.1538628562303333, 0.03165807196980014, -0.08601042242576916, -0.017595061785815394, -0.13712488836608827, 0.030248279838512342, 0.28915836025422037, 0.16410785390968052, 0.1202811695014437, -0.44543208475863816, -0.24180385541609106, 0.07152499850181972, 0.020438411627444166, -0.05750551620297426, -0.01660557315849206, -0.2996483542408575, -0.009386279948932283, -0.18962260983044318, -0.1351709499653867, 0.07128900281317971, -0.07325513781431843, 0.08367776728061703, -0.23654535622792502, -0.03536893184954191, -0.08586430226854395, 0.15983524634137602, -0.052399523537971227, -0.13449286884518669, -0.05086929076488184, 0.14703651864592934, 0.04235903710393947, 0.009716301769538619, 0.1706091140844293, -0.1080316405779883, -0.043911055068248044, 0.3567089541500215, -0.09369832002466508, -0.06836815577858657, 0.1571081142653437, -0.2157092253202755, -0.09046148229846913, 0.22159071462959343, 0.23984105477803477, 0.07189997011229542, -0.19761178121609868, 0.027102839815722524, 0.03928439020905096, 0.16364094905336113, 0.10358176697912973, 0.030537346316337147, 0.19514944747674698, 0.25084083999607565, 0.10580261494717835, 0.06553722154714313, -0.3048549707860266, 0.041278102836918594, -0.2540397367659299, -0.11405863834764152, -0.1838647535175779, -0.009344789907153622, -0.048405894310574286, -0.15810362126806057, 0.4290054183015052, 0.15053708664159857, 0.10573034072020913, -0.049955023062305856, 0.35572799392884563, 0.03352753120456256, 0.04754069028878767, 0.02834097153561957, 0.2744311122862878, 0.08750253541888121, 0.16109725559020743, -0.25617117890700075, 0.10182547169354032, 0.010465845960995876]
|
706.172
|
Correction of paper published in J. Combinatorial Theory 21, 1976: On
the Existence of Hadamard Matrices
|
In the paper On the Existence of Hadamard Matrices in J. Combinatorial Theory
21, 1976, it is shown that for a natural number q > 3, we can construct an
Hadamard Matrix of order 2^s q for s \geq t where t = [2 log_2(q-3)]. I will
show that this bound is not a consequence of the proof given in the paper and
explain the error in the argumentation.
|
math.CO
|
in the paper on the existence of hadamard matrices in j combinatorial theory 21 1976 it is shown that for a natural number q 3 we can construct an hadamard matrix of order 2s q for s geq t where t 2 log_2q3 i will show that this bound is not a consequence of the proof given in the paper and explain the error in the argumentation
|
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|
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|
706.1721
|
Geometric Origin of Physical Constants in a Kaluza-Klein Tetrad Model
|
An important feature of Kaluza-Klein theories is their ability to relate
fundamental physical constants to the radii of higher dimensions. In previous
Kaluza-Klein theory, which unifies the electromagnetic field with gravity as
dimensionless components of a Kaluza-Klein metric, i) all fields have the same
physical dimensions, ii) the Lagrangian has no explicit dependence on any
physical constants except mass, and hence iii) all physical constants in the
field equations except for mass originate from geometry. While it seems natural
in Kaluza-Klein theory to add fermion fields by defining higher dimensional
bispinor fields on the Kaluza-Klein manifold, these Kaluza-Klein theories do
not satisfy conditions (i), (ii), and (iii). In this paper, we show how
conditions (i), (ii), and (iii) can be satisfied by including bispinor fields
in a tetrad formulation of the Kaluza-Klein model, as well as in an equivalent
teleparallel model. This demonstrates an unexpected feature of Dirac's bispinor
equation, since conditions (i), (ii), (iii) imply a special relation among the
terms in the Kaluza-Klein or teleparallel Lagrangian that would not be
satisfied in general.
|
gr-qc astro-ph math-ph math.MP
|
an important feature of kaluzaklein theories is their ability to relate fundamental physical constants to the radii of higher dimensions in previous kaluzaklein theory which unifies the electromagnetic field with gravity as dimensionless components of a kaluzaklein metric i all fields have the same physical dimensions ii the lagrangian has no explicit dependence on any physical constants except mass and hence iii all physical constants in the field equations except for mass originate from geometry while it seems natural in kaluzaklein theory to add fermion fields by defining higher dimensional bispinor fields on the kaluzaklein manifold these kaluzaklein theories do not satisfy conditions i ii and iii in this paper we show how conditions i ii and iii can be satisfied by including bispinor fields in a tetrad formulation of the kaluzaklein model as well as in an equivalent teleparallel model this demonstrates an unexpected feature of diracs bispinor equation since conditions i ii iii imply a special relation among the terms in the kaluzaklein or teleparallel lagrangian that would not be satisfied in general
|
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|
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|
706.1722
|
A kinetic approach to non resonant modes and growth rates of streaming
instability: consequences for shock acceleration
|
We show here that a purely kinetic approach to the excitation of waves by
cosmic rays in the vicinity of a shock front leads to predict the appearance of
a non-alfvenic fastly growing mode which is the same that was found by Bell
(2004) by treating the plasma in the MHD approximation. The kinetic approach we
present is more powerful in that it allows us to investigate different models
for the compensation of the cosmic ray current in the background upstream
plasma.
|
astro-ph
|
we show here that a purely kinetic approach to the excitation of waves by cosmic rays in the vicinity of a shock front leads to predict the appearance of a nonalfvenic fastly growing mode which is the same that was found by bell 2004 by treating the plasma in the mhd approximation the kinetic approach we present is more powerful in that it allows us to investigate different models for the compensation of the cosmic ray current in the background upstream plasma
|
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|
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|
706.1723
|
Ehrlich-Schwoebel Effect for Organic Molecules: Direct Calculation of
the Step Edge Barrier using Empirical Potentials
|
The step edge barrier of a prototypical organic semiconductor molecule,
3,4,9,10-perylene-tetracaboxylic-dianhydride (PTCDA) has been analysed by means
of calculations based on emperical potentials. The minimum energy path (MEP)
has been calculated for a single molecule on a substrate of three molecular
layers between equivalent minimum energy positions within two neighboring unit
cells. To determine the step edge barrier, we have calculated the MEP over a
step to a fourth layer of molecules. We found energy barriers of E_D= 80 meV
for in-layer diffusion and E_S = 750 meV for step crossing, indicating a strong
Ehrlich-Schwoebel effect for PTCDA.
|
cond-mat.other
|
the step edge barrier of a prototypical organic semiconductor molecule 34910perylenetetracaboxylicdianhydride ptcda has been analysed by means of calculations based on emperical potentials the minimum energy path mep has been calculated for a single molecule on a substrate of three molecular layers between equivalent minimum energy positions within two neighboring unit cells to determine the step edge barrier we have calculated the mep over a step to a fourth layer of molecules we found energy barriers of e_d 80 mev for inlayer diffusion and e_s 750 mev for step crossing indicating a strong ehrlichschwoebel effect for ptcda
|
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|
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|
706.1724
|
Star formation in Perseus: III. Outflows
|
We present a search for outflows towards 51 submillimetre cores in Perseus.
With consistently derived outflow properties from a large homogeneous dataset
within one molecular cloud we can investigate further the mass dependence and
time evolution of protostellar mass loss. Of the 51 cores, 37 show broad
linewings indicative of molecular outflows. In 13 cases, the linewings could be
due to confusion with neighbouring flows but 9 of those sources also have
near-infrared detections confirming their protostellar nature. The total
fraction of protostars in our sample is 65%. All but four outflow detections
are confirmed as protostellar by Spitzer IR detections and only one Spitzer
source has no outflow, showing that outflow maps at this sensitivity are
equally good at identifying protostars as Spitzer. Outflow momentum flux
correlates both with source luminosity and with core mass but there is
considerable scatter even within this one cloud despite the homogeneous
dataset. We fail to confirm the result of Bontemps et al. (1996) that Class I
sources show lower momentum fluxes on average than Class 0 sources, with a KS
test showing a significant probability that the momentum fluxes for both Class
0s and Class Is are drawn from the same distribution. We find that outflow
power may not show a simple decline between the Class 0 to Class I stages. Our
sample includes low momentum flux, low-luminosity Class 0 sources, possibly at
a very early evolutionary stage. If the only mass loss from the core were due
to outflows, cores would last for 10^5-10^8 years, longer than current
estimates of 1.5-4 x 10^5 years for the mean lifetime for the embedded phase.
Additional mechanisms for removing mass from protostellar cores may be
necessary.
|
astro-ph
|
we present a search for outflows towards 51 submillimetre cores in perseus with consistently derived outflow properties from a large homogeneous dataset within one molecular cloud we can investigate further the mass dependence and time evolution of protostellar mass loss of the 51 cores 37 show broad linewings indicative of molecular outflows in 13 cases the linewings could be due to confusion with neighbouring flows but 9 of those sources also have nearinfrared detections confirming their protostellar nature the total fraction of protostars in our sample is 65 all but four outflow detections are confirmed as protostellar by spitzer ir detections and only one spitzer source has no outflow showing that outflow maps at this sensitivity are equally good at identifying protostars as spitzer outflow momentum flux correlates both with source luminosity and with core mass but there is considerable scatter even within this one cloud despite the homogeneous dataset we fail to confirm the result of bontemps et al 1996 that class i sources show lower momentum fluxes on average than class 0 sources with a ks test showing a significant probability that the momentum fluxes for both class 0s and class is are drawn from the same distribution we find that outflow power may not show a simple decline between the class 0 to class i stages our sample includes low momentum flux lowluminosity class 0 sources possibly at a very early evolutionary stage if the only mass loss from the core were due to outflows cores would last for 105108 years longer than current estimates of 154 x 105 years for the mean lifetime for the embedded phase additional mechanisms for removing mass from protostellar cores may be necessary
|
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|
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|
706.1725
|
The two possible values of the chromatic number of a random graph
|
Given d \in (0,infty) let k_d be the smallest integer k such that d < 2k\log
k. We prove that the chromatic number of a random graph G(n,d/n) is either k_d
or k_d+1 almost surely.
|
math.PR
|
given d in 0infty let k_d be the smallest integer k such that d 2klog k we prove that the chromatic number of a random graph gndn is either k_d or k_d1 almost surely
|
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|
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|
706.1726
|
High Precision determination of the pi, K, D and D_s decay constants
from lattice QCD
|
We determine $D$ and $D_s$ decay constants from lattice QCD with 2% errors, 4
times better than experiment and previous theory: $f_{D_s}$ = 241(3) MeV, $f_D$
= 207(4) MeV and $f_{D_s}/f_D$ = 1.164(11).
We also obtain $f_K/f_{\pi}$ = 1.189(7) and $(f_{D_s}/f_D)/(f_K/f_{\pi})$ =
0.979(11). Combining with experiment gives $V_{us}$=0.2262(14) and
$V_{cs}/V_{cd}$ of 4.43(41). We use a highly improved quark discretization on
MILC gluon fields that include realistic sea quarks fixing the $u/d, s$ and $c$
masses from the $\pi$, $K$, and $\eta_c$ meson masses. This allows a stringent
test against experiment for $D$ and $D_s$ masses for the first time (to within
7 MeV).
|
hep-lat hep-ph
|
we determine d and d_s decay constants from lattice qcd with 2 errors 4 times better than experiment and previous theory f_d_s 2413 mev f_d 2074 mev and f_d_sf_d 116411 we also obtain f_kf_pi 11897 and f_d_sf_df_kf_pi 097911 combining with experiment gives v_us0226214 and v_csv_cd of 44341 we use a highly improved quark discretization on milc gluon fields that include realistic sea quarks fixing the ud s and c masses from the pi k and eta_c meson masses this allows a stringent test against experiment for d and d_s masses for the first time to within 7 mev
|
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|
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|
706.1727
|
Comment on "Elementary Kaluza-Klein towers revisited"
|
Recently the spectrum of KK modes in the framework of one flat
extra-dimensional scenario was revisited in the paper Phys. Rev. D74 (2006)
124013, (hep-th/0607246) on the basis of self-adjoint extension of the quantum
mechanical operator determining the KK masses. In this Letter we note that the
range of allowed boundary conditions on the KK modes is overestimated in above
mentioned paper and give all allowed possibilities.
|
hep-th gr-qc
|
recently the spectrum of kk modes in the framework of one flat extradimensional scenario was revisited in the paper phys rev d74 2006 124013 hepth0607246 on the basis of selfadjoint extension of the quantum mechanical operator determining the kk masses in this letter we note that the range of allowed boundary conditions on the kk modes is overestimated in above mentioned paper and give all allowed possibilities
|
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|
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|
706.1728
|
Lambda Mu Calculus and Duality: Call-by-Name and Call-by-Value
|
Under the extension of Curry-Howard's correspondence to classical logic,
Gentzen's NK and LK systems can be seen as syntax-directed systems of simple
types respectively for Parigot's Lambda Mu Calculus and Curien-Herbelin's
Lambda Bar Mu Mu Tidle Calculus. We aim at showing their computational
equivalence. We define translations between these calculi. We prove simulation
theorems for an undirected evaluation as well as for call-by-name and
call-by-value evaluations.
|
math.LO
|
under the extension of curryhowards correspondence to classical logic gentzens nk and lk systems can be seen as syntaxdirected systems of simple types respectively for parigots lambda mu calculus and curienherbelins lambda bar mu mu tidle calculus we aim at showing their computational equivalence we define translations between these calculi we prove simulation theorems for an undirected evaluation as well as for callbyname and callbyvalue evaluations
|
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|
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|
706.1729
|
Mixing angles of quarks and leptons as an outcome of SU(2) horizontal
symmetries
|
We show that all mixing angles are determined, within experimental
uncertainty, by a product of SU(2) horizontal symmetries intimately linked to
the algebra of weak neutral currents. This concerns: on one hand, the three
quark mixing angles; on the other hand, a neutrino-like pattern in which
theta_{23} is maximal and tan (2 theta_{12}) = 2. The latter turns out to
exactly satisfy the ``quark-lepton complementarity condition'' theta_c +
theta_{12} = pi/4. Moreover, among all solutions, two values for the third
neutrino mixing angle arise, which satisfy the bound sin^2(theta_{13}) \leq
0.1: theta_{13} = +/- 5.7 10^{-3} and theta_{13} = +/- 0.2717.
|
hep-ph
|
we show that all mixing angles are determined within experimental uncertainty by a product of su2 horizontal symmetries intimately linked to the algebra of weak neutral currents this concerns on one hand the three quark mixing angles on the other hand a neutrinolike pattern in which theta_23 is maximal and tan 2 theta_12 2 the latter turns out to exactly satisfy the quarklepton complementarity condition theta_c theta_12 pi4 moreover among all solutions two values for the third neutrino mixing angle arise which satisfy the bound sin2theta_13 leq 01 theta_13 57 103 and theta_13 02717
|
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|
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|
706.173
|
Global well-posedness for dissipative Korteweg-de Vries equations
|
This paper is devoted to the well-posedness for dissipative KdV equations
$u_t+u_{xxx}+|D_x|^{2\alpha}u+uu_x=0$, $0<\alpha\leq 1$. An optimal bilinear
estimate is obtained in Bourgain's type spaces, which provides global
well-posedness in $H^s(\R)$, $s>-3/4$ for $\alpha\leq1/2$ and
$s>-3/(5-2\alpha)$ for $\alpha>1/2$.
|
math.AP
|
this paper is devoted to the wellposedness for dissipative kdv equations u_tu_xxxd_x2alphauuu_x0 0alphaleq 1 an optimal bilinear estimate is obtained in bourgains type spaces which provides global wellposedness in hsr s34 for alphaleq12 and s352alpha for alpha12
|
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|
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|
706.1731
|
The VLT-FLAMES survey of massive stars: Evolution of surface N
abundances and effective temperature scales in the Galaxy and Magellanic
Clouds
|
We present an analysis of high resolution VLT-FLAMES spectra of 61 B-type
stars with relatively narrow-lined spectra located in 4 fields centered on the
Milky Way clusters; NGC3293 & NGC4755 and the Large and Small Magellanic cloud
clusters; NGC2004 and NGC330. For each object a quantitative analysis was
carried out using the non-LTE model atmosphere code TLUSTY; resulting in the
determination of their atmospheric parameters and photospheric abundances of
the dominant metal species (C, N, O, Mg, Si, Fe). The results are discussed in
relation to our earlier work on 3 younger clusters in these galaxies; NGC6611,
N11 and NGC346 paying particular attention to the nitrogen abundances which are
an important probe of the role of rotation in the evolution of stars. This work
along with that of the younger clusters provides a consistent dataset of
abundances and atmospheric parameters for over 100 B-type stars in the three
galaxies. We provide effective temperature scales for B-type dwarfs in all
three galaxies and for giants and supergiants in the SMC and LMC. In each
galaxy a dependence on luminosity is found between the three classes with the
unevolved dwarf objects having significantly higher effective temperatures. A
metallicity dependence is present between the SMC and Galactic dwarf objects,
and whilst the LMC stars are only slightly cooler than the SMC stars, they are
significantly hotter than their Galactic counterparts.
|
astro-ph
|
we present an analysis of high resolution vltflames spectra of 61 btype stars with relatively narrowlined spectra located in 4 fields centered on the milky way clusters ngc3293 ngc4755 and the large and small magellanic cloud clusters ngc2004 and ngc330 for each object a quantitative analysis was carried out using the nonlte model atmosphere code tlusty resulting in the determination of their atmospheric parameters and photospheric abundances of the dominant metal species c n o mg si fe the results are discussed in relation to our earlier work on 3 younger clusters in these galaxies ngc6611 n11 and ngc346 paying particular attention to the nitrogen abundances which are an important probe of the role of rotation in the evolution of stars this work along with that of the younger clusters provides a consistent dataset of abundances and atmospheric parameters for over 100 btype stars in the three galaxies we provide effective temperature scales for btype dwarfs in all three galaxies and for giants and supergiants in the smc and lmc in each galaxy a dependence on luminosity is found between the three classes with the unevolved dwarf objects having significantly higher effective temperatures a metallicity dependence is present between the smc and galactic dwarf objects and whilst the lmc stars are only slightly cooler than the smc stars they are significantly hotter than their galactic counterparts
|
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|
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|
706.1732
|
GeV Seesaw, Accidentally Small Neutrino Masses, and Higgs Decays to
Neutrinos
|
If the Standard Model particle content is extended by gauge singlet fermions
(right-handed neutrinos), active neutrinos generically acquire (Majorana)
masses, in agreement with our current understanding of the lepton sector. If
the right-handed neutrino masses are of the same order as the electroweak
symmetry breaking scale, it is usually expected that these will not mediate any
experimentally observable effects. Here, I explore the fact that this is not
necessarily the case. If neutrino masses are "accidentally small",
active-sterile mixing angles can, according to current experimental bounds, be
as large as several percent. If this is the case, I argue that the dominant
decay mode of light (M_H less than 130 GeV) Higgs bosons could be into an
active and a sterile neutrino. The sterile neutrino decays promptly into a
charge lepton and an on- or off-shell W-boson, so that the dominant Higgs boson
decay mode is H to leptons + jets + missing transverse energy.
|
hep-ph
|
if the standard model particle content is extended by gauge singlet fermions righthanded neutrinos active neutrinos generically acquire majorana masses in agreement with our current understanding of the lepton sector if the righthanded neutrino masses are of the same order as the electroweak symmetry breaking scale it is usually expected that these will not mediate any experimentally observable effects here i explore the fact that this is not necessarily the case if neutrino masses are accidentally small activesterile mixing angles can according to current experimental bounds be as large as several percent if this is the case i argue that the dominant decay mode of light m_h less than 130 gev higgs bosons could be into an active and a sterile neutrino the sterile neutrino decays promptly into a charge lepton and an on or offshell wboson so that the dominant higgs boson decay mode is h to leptons jets missing transverse energy
|
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|
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|
706.1733
|
Magnetic fingerprint in a ferromagnetic wire: Spin torque diode effect
and induction of the DC voltage spectrum inherent in the wire under
application for RF current
|
We report the rectifying effect of a constant-wave radio frequency (RF)
current by a magnetic domain wall (DW) on a single-layered ferromagnetic wire.
A direct-current (DC) voltage is generated by the spin torque diode effect,
which is a consequence of magnetoresistance oscillation due to the resonant
spin wave excitation induced by the spin-polarized RF current. The DC voltage
spectrum strongly depends on the internal spin structure in the DW, which
corresponds to the magnetic fingerprint of the spin structure in the
ferromagnetic wire.
|
cond-mat.mtrl-sci cond-mat.mes-hall
|
we report the rectifying effect of a constantwave radio frequency rf current by a magnetic domain wall dw on a singlelayered ferromagnetic wire a directcurrent dc voltage is generated by the spin torque diode effect which is a consequence of magnetoresistance oscillation due to the resonant spin wave excitation induced by the spinpolarized rf current the dc voltage spectrum strongly depends on the internal spin structure in the dw which corresponds to the magnetic fingerprint of the spin structure in the ferromagnetic wire
|
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|
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|
706.1734
|
The new very small angle neutron scattering spectrometer at Laboratoire
Leon Brillouin
|
The design and characteristics of the new very small angle neutron scattering
spectrometer under construction at the Laboratoire Leon Brillouin is described.
Its goal is to extend the range of scattering vectors magnitudes towards
2x10{-4} /A. The unique feature of this new spectrometer is a high resolution
two dimensional image plate detector sensitive to neutrons. The wavelength
selection is achieved by a double reflection supermirror monochromator and the
collimator uses a novel multibeam design.
|
cond-mat.soft physics.ins-det
|
the design and characteristics of the new very small angle neutron scattering spectrometer under construction at the laboratoire leon brillouin is described its goal is to extend the range of scattering vectors magnitudes towards 2x104 a the unique feature of this new spectrometer is a high resolution two dimensional image plate detector sensitive to neutrons the wavelength selection is achieved by a double reflection supermirror monochromator and the collimator uses a novel multibeam design
|
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|
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|
706.1735
|
Self Replication and Signalling
|
It is known that if one could clone an arbitrary quantum state one could send
signal faster than the speed of light. However it remains interesting to see
that if one can perfectly self replicate an arbitrary quantum state, does it
violate the no signalling principle? Here we see that perfect self replication
would also lead to superluminal signalling.
|
quant-ph
|
it is known that if one could clone an arbitrary quantum state one could send signal faster than the speed of light however it remains interesting to see that if one can perfectly self replicate an arbitrary quantum state does it violate the no signalling principle here we see that perfect self replication would also lead to superluminal signalling
|
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|
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|
706.1736
|
Gilbert and Landau-Lifshitz damping in the presense of spin-torque
|
A recent article by Stiles et al. (cond-mat/0702020) argued in favor of the
Landau-Lifshitz damping term in the micromagnetic equations of motion over that
of the more commonly accepted Gilbert damping form. Much of their argument
revolved around spin-torque driven domain wall motion in narrow magnetic wires,
since the presence of spin-torques can more acutely draw a distinction between
the two forms of damping. In this article, the author uses simple arguments and
examples to offer an alternative point of view favoring Gilbert.
|
cond-mat.other
|
a recent article by stiles et al condmat0702020 argued in favor of the landaulifshitz damping term in the micromagnetic equations of motion over that of the more commonly accepted gilbert damping form much of their argument revolved around spintorque driven domain wall motion in narrow magnetic wires since the presence of spintorques can more acutely draw a distinction between the two forms of damping in this article the author uses simple arguments and examples to offer an alternative point of view favoring gilbert
|
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|
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|
706.1737
|
Noise enhancement due to quantum coherence in coupled quantum dots
|
We show that the intriguing observation of noise enhancement in the charge
transport through two vertically coupled quantum dots can be explained by the
interplay of quantum coherence and strong Coulomb blockade. We demonstrate that
this novel mechanism for super-Poissonian charge transfer is very sensitive to
decoherence caused by electron-phonon scattering as inferred from the measured
temperature dependence.
|
cond-mat.mes-hall
|
we show that the intriguing observation of noise enhancement in the charge transport through two vertically coupled quantum dots can be explained by the interplay of quantum coherence and strong coulomb blockade we demonstrate that this novel mechanism for superpoissonian charge transfer is very sensitive to decoherence caused by electronphonon scattering as inferred from the measured temperature dependence
|
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|
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|
706.1738
|
Permutations with Extremal number of Fixed Points
|
We extend Stanley's work on alternating permutations with extremal number of
fixed points in two directions: first, alternating permutations are replaced by
permutations with a prescribed descent set; second, instead of simply counting
permutations we study their generating polynomials by number of excedances.
Several techniques are used: Desarmenien's desarrangement combinatorics,
Gessel's hook-factorization and the analytical properties of two new
permutation statistics "DEZ" and "lec". Explicit formulas for the maximal case
are derived by using symmetric function tools.
|
math.CO
|
we extend stanleys work on alternating permutations with extremal number of fixed points in two directions first alternating permutations are replaced by permutations with a prescribed descent set second instead of simply counting permutations we study their generating polynomials by number of excedances several techniques are used desarmeniens desarrangement combinatorics gessels hookfactorization and the analytical properties of two new permutation statistics dez and lec explicit formulas for the maximal case are derived by using symmetric function tools
|
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|
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|
706.1739
|
Speckle noise and dynamic range in coronagraphic images
|
This paper is concerned with the theoretical properties of high contrast
coronagraphic images in the context of exoplanet searches. We derive and
analyze the statistical properties of the residual starlight in coronagraphic
images, and describe the effect of a coronagraph on the speckle and photon
noise. Current observations with coronagraphic instruments have shown that the
main limitations to high contrast imaging are due to residual quasi-static
speckles. We tackle this problem in this paper, and propose a generalization of
our statistical model to include the description of static, quasi-static and
fast residual atmospheric speckles. The results provide insight into the
effects on the dynamic range of wavefront control, coronagraphy, active speckle
reduction, and differential speckle calibration. The study is focused on
ground-based imaging with extreme adaptive optics, but the approach is general
enough to be applicable to space, with different parameters.
|
astro-ph
|
this paper is concerned with the theoretical properties of high contrast coronagraphic images in the context of exoplanet searches we derive and analyze the statistical properties of the residual starlight in coronagraphic images and describe the effect of a coronagraph on the speckle and photon noise current observations with coronagraphic instruments have shown that the main limitations to high contrast imaging are due to residual quasistatic speckles we tackle this problem in this paper and propose a generalization of our statistical model to include the description of static quasistatic and fast residual atmospheric speckles the results provide insight into the effects on the dynamic range of wavefront control coronagraphy active speckle reduction and differential speckle calibration the study is focused on groundbased imaging with extreme adaptive optics but the approach is general enough to be applicable to space with different parameters
|
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|
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|
706.174
|
On path factors of (3,4)-biregular bigraphs
|
A (3,4)-biregular bigraph G is a bipartite graph where all vertices in one
part have degree 3 and all vertices in the other part have degree 4. A path
factor of G is a spanning subgraph whose components are nontrivial paths. We
prove that a simple (3,4)-biregular bigraph always has a path factor such that
the endpoints of each path have degree three. Moreover we suggest a polynomial
algorithm for the construction of such a path factor.
|
math.CO
|
a 34biregular bigraph g is a bipartite graph where all vertices in one part have degree 3 and all vertices in the other part have degree 4 a path factor of g is a spanning subgraph whose components are nontrivial paths we prove that a simple 34biregular bigraph always has a path factor such that the endpoints of each path have degree three moreover we suggest a polynomial algorithm for the construction of such a path factor
|
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|
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|
706.1741
|
Breakdown of the Thomas Fermi approximation for polarized Fermi gases
|
We use Bogoliubov de-Gennes theory to show that the commonly used
Thomas-Fermi approximation (TFA) can fail in describing polarized unitary gases
in anisotropic harmonic traps. We find a magnetized superfluid region inside
the trap, with order parameter oscillations, even though there is no such
stable bulk phase. This leads to magnetization profiles that deviate from
contours of constant potential energy. We determine how this violation scales
with trap anisotropy and number of particles, and show that we are able to
account for important differences between the MIT and Rice experiments.
|
cond-mat.supr-con cond-mat.str-el
|
we use bogoliubov degennes theory to show that the commonly used thomasfermi approximation tfa can fail in describing polarized unitary gases in anisotropic harmonic traps we find a magnetized superfluid region inside the trap with order parameter oscillations even though there is no such stable bulk phase this leads to magnetization profiles that deviate from contours of constant potential energy we determine how this violation scales with trap anisotropy and number of particles and show that we are able to account for important differences between the mit and rice experiments
|
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|
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|
706.1742
|
Intrinsic nanoscale inhomogeneity in ordering systems due to
elastic-mediated interactions
|
Phase diagram and pattern formation in two-dimensional Ising model with
coupling between order parameter and lattice vibrations is investigated by
Monte-Carlo simulations. It is shown that if the coupling is strong enough (or
phonons are soft enough) a short-range order exists in disordered phase for a
broader temperature interval. Different types of this short-range order
(stripe-like, checkboard-like, etc.) depending on the temperature and model
parameters are investigated. With further increase of the coupling, a
reconstruction of the ground state happens and new ordered phases appear at low
enough temperatures.
|
cond-mat.stat-mech cond-mat.mtrl-sci
|
phase diagram and pattern formation in twodimensional ising model with coupling between order parameter and lattice vibrations is investigated by montecarlo simulations it is shown that if the coupling is strong enough or phonons are soft enough a shortrange order exists in disordered phase for a broader temperature interval different types of this shortrange order stripelike checkboardlike etc depending on the temperature and model parameters are investigated with further increase of the coupling a reconstruction of the ground state happens and new ordered phases appear at low enough temperatures
|
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|
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|
706.1743
|
Bloch vectors for qudits and geometry of entanglement
|
We present three different matrix bases that can be used to decompose density
matrices of d--dimensional quantum systems, so-called qudits: the generalized
Gell-Mann matrix basis, the polarization operator basis, and the Weyl operator
basis. Such a decomposition can be identified with a vector --the Bloch vector,
i.e. a generalization of the well known qubit case-- and is a convenient
expression for comparison with measurable quantities and for explicit
calculations avoiding the handling of large matrices. We consider the important
case of an isotropic two--qudit state and decompose it according to each basis.
Investigating the geometry of entanglement of special parameterized two--qubit
and two--qutrit states, in particular we calculate the Hilbert--Schmidt measure
of entanglement, we find that the Weyl operator basis is the optimal choice
since it is closely connected to the entanglement of the considered states.
|
quant-ph
|
we present three different matrix bases that can be used to decompose density matrices of ddimensional quantum systems socalled qudits the generalized gellmann matrix basis the polarization operator basis and the weyl operator basis such a decomposition can be identified with a vector the bloch vector ie a generalization of the well known qubit case and is a convenient expression for comparison with measurable quantities and for explicit calculations avoiding the handling of large matrices we consider the important case of an isotropic twoqudit state and decompose it according to each basis investigating the geometry of entanglement of special parameterized twoqubit and twoqutrit states in particular we calculate the hilbertschmidt measure of entanglement we find that the weyl operator basis is the optimal choice since it is closely connected to the entanglement of the considered states
|
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|
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|
706.1744
|
On a complex differential Riccati equation
|
We consider a nonlinear partial differential equation for complex-valued
functions which is related to the two-dimensional stationary Schrodinger
equation and enjoys many properties similar to those of the ordinary
differential Riccati equation as, e.g., the famous Euler theorems, the Picard
theorem and others. Besides these generalizations of the classical
"one-dimensional" results we discuss new features of the considered equation
like, e.g., an analogue of the Cauchy integral theorem.
|
math.AP math.CA math.CV
|
we consider a nonlinear partial differential equation for complexvalued functions which is related to the twodimensional stationary schrodinger equation and enjoys many properties similar to those of the ordinary differential riccati equation as eg the famous euler theorems the picard theorem and others besides these generalizations of the classical onedimensional results we discuss new features of the considered equation like eg an analogue of the cauchy integral theorem
|
[['we', 'consider', 'a', 'nonlinear', 'partial', 'differential', 'equation', 'for', 'complexvalued', 'functions', 'which', 'is', 'related', 'to', 'the', 'twodimensional', 'stationary', 'schrodinger', 'equation', 'and', 'enjoys', 'many', 'properties', 'similar', 'to', 'those', 'of', 'the', 'ordinary', 'differential', 'riccati', 'equation', 'as', 'eg', 'the', 'famous', 'euler', 'theorems', 'the', 'picard', 'theorem', 'and', 'others', 'besides', 'these', 'generalizations', 'of', 'the', 'classical', 'onedimensional', 'results', 'we', 'discuss', 'new', 'features', 'of', 'the', 'considered', 'equation', 'like', 'eg', 'an', 'analogue', 'of', 'the', 'cauchy', 'integral', 'theorem']]
|
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|
706.1745
|
Noether Symmetries and Conservations Laws For Non-critical Kohn-Laplace
Equations on Three-Dimensional Heisenberg Group
|
We show which Lie point symmetries of non-critical semilinear Kohn-Laplace
equations on the Heisenberg group $H^1$ are Noether symmetries and we establish
their respectives conservations laws.
|
math.AP
|
we show which lie point symmetries of noncritical semilinear kohnlaplace equations on the heisenberg group h1 are noether symmetries and we establish their respectives conservations laws
|
[['we', 'show', 'which', 'lie', 'point', 'symmetries', 'of', 'noncritical', 'semilinear', 'kohnlaplace', 'equations', 'on', 'the', 'heisenberg', 'group', 'h1', 'are', 'noether', 'symmetries', 'and', 'we', 'establish', 'their', 'respectives', 'conservations', 'laws']]
|
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|
706.1746
|
Triplet Josephson effect with magnetic feedback
|
We study AC Josephson effect in a superconductor-ferromagnet heterostructure
with a variable magnetic configuration. The system supports triplet proximity
correlations whose dynamics is coupled to the magnetic dynamics. This feedback
dramatically modifies the behavior of the junction. The current-phase relation
becomes double-periodic at both very low and high Josephson frequencies
$\omega_J$. At intermediate frequencies, the periodicity in $\omega_J t$ may be
lost.
|
cond-mat.supr-con
|
we study ac josephson effect in a superconductorferromagnet heterostructure with a variable magnetic configuration the system supports triplet proximity correlations whose dynamics is coupled to the magnetic dynamics this feedback dramatically modifies the behavior of the junction the currentphase relation becomes doubleperiodic at both very low and high josephson frequencies omega_j at intermediate frequencies the periodicity in omega_j t may be lost
|
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|
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|
706.1747
|
Characterization of coherent impurity effects in solid state qubits
|
We propose a characterisation of the effects of bistable coherent impurities
in solid state qubits. We introduce an effective impurity description in terms
of a tunable spin-boson environment and solve the dynamics for the qubit
coherences. The dominant rate characterizing the asymptotic time limit is
identified and signatures of non-Gaussian behavior of the quantum impurity at
intermediate times are pointed out. An alternative perspective considering the
qubit as a measurement device for the spin-boson impurity is proposed.
|
cond-mat.stat-mech cond-mat.mes-hall
|
we propose a characterisation of the effects of bistable coherent impurities in solid state qubits we introduce an effective impurity description in terms of a tunable spinboson environment and solve the dynamics for the qubit coherences the dominant rate characterizing the asymptotic time limit is identified and signatures of nongaussian behavior of the quantum impurity at intermediate times are pointed out an alternative perspective considering the qubit as a measurement device for the spinboson impurity is proposed
|
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|
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|
706.1748
|
Crystal Irradiation Stimulation of Enzyme Reactivity: An Explanation
|
In 1968, Sorin Comorosan first reported a phenomenon wherein irradiation of
the substrate of an enzyme reaction, in the crystalline state, for a specific
number of seconds could lead to an enhanced aqueous solution reaction rate for
the enzyme(up to 30%). Dependence on crystal irradiation time was found to be
oscillatory with a fixed period. The basis for this unusual phenomenon has
remained a mystery. Previously unreported experimental results are presented
which demonstrate, for the LDH / pyruvate reaction, that the identity of the
crystalline material irradiated is, largely, inconsequential. It is proposed
here that the irradiation procedure drives oscillatory reactions involving
atmospheric gases adsorbed on the crystals and that these photoproducts, or
related dark-reaction species, when dissolved, function as enzyme cofactors.
|
q-bio.SC q-bio.BM
|
in 1968 sorin comorosan first reported a phenomenon wherein irradiation of the substrate of an enzyme reaction in the crystalline state for a specific number of seconds could lead to an enhanced aqueous solution reaction rate for the enzymeup to 30 dependence on crystal irradiation time was found to be oscillatory with a fixed period the basis for this unusual phenomenon has remained a mystery previously unreported experimental results are presented which demonstrate for the ldh pyruvate reaction that the identity of the crystalline material irradiated is largely inconsequential it is proposed here that the irradiation procedure drives oscillatory reactions involving atmospheric gases adsorbed on the crystals and that these photoproducts or related darkreaction species when dissolved function as enzyme cofactors
|
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|
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|
706.1749
|
Studies of clustering in the arrival directions of cosmic rays detected
at the Pierre Auger Observatory above 10 EeV
|
If clustering of the arrival directions of ultra high energy cosmic rays is
discovered, this would provide important information about their origin,
composition, and the galactic and extragalactic magnetic fields. We present
here the analysis of the autocorrelation function of the data from the Pierre
Auger Observatory as a function of the angular scale and the energy threshold.
We compare our results with the signals found by previous experiments.
|
astro-ph
|
if clustering of the arrival directions of ultra high energy cosmic rays is discovered this would provide important information about their origin composition and the galactic and extragalactic magnetic fields we present here the analysis of the autocorrelation function of the data from the pierre auger observatory as a function of the angular scale and the energy threshold we compare our results with the signals found by previous experiments
|
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|
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|
706.175
|
On the Linearization of the Painleve' III-VI Equations and Reductions of
the Three-Wave Resonant System
|
We extend similarity reductions of the coupled (2+1)-dimensional three-wave
resonant interaction system to its Lax pair. Thus we obtain new 3x3 matrix
Fuchs--Garnier pairs for the third and fifth Painleve' equations, together with
the previously known Fuchs--Garnier pair for the fourth and sixth Painleve'
equations. These Fuchs--Garnier pairs have an important feature: they are
linear with respect to the spectral parameter. Therefore we can apply the
Laplace transform to study these pairs. In this way we found reductions of all
pairs to the standard 2x2 matrix Fuchs--Garnier pairs obtained by M. Jimbo and
T. Miwa. As an application of the 3x3 matrix pairs, we found an integral
auto-transformation for the standard Fuchs--Garnier pair for the fifth
Painleve' equation. It generates an Okamoto-like B\"acklund transformation for
the fifth Painleve' equation. Another application is an integral transformation
relating two different 2x2 matrix Fuchs--Garnier pairs for the third Painleve'
equation.
|
math.CA
|
we extend similarity reductions of the coupled 21dimensional threewave resonant interaction system to its lax pair thus we obtain new 3x3 matrix fuchsgarnier pairs for the third and fifth painleve equations together with the previously known fuchsgarnier pair for the fourth and sixth painleve equations these fuchsgarnier pairs have an important feature they are linear with respect to the spectral parameter therefore we can apply the laplace transform to study these pairs in this way we found reductions of all pairs to the standard 2x2 matrix fuchsgarnier pairs obtained by m jimbo and t miwa as an application of the 3x3 matrix pairs we found an integral autotransformation for the standard fuchsgarnier pair for the fifth painleve equation it generates an okamotolike backlund transformation for the fifth painleve equation another application is an integral transformation relating two different 2x2 matrix fuchsgarnier pairs for the third painleve equation
|
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|
[-0.15862807135850396, 0.01259510608978828, -0.004339639824649242, 0.06863909474676093, -0.10285458438997859, -0.16117238824587468, -0.05283951678046995, 0.29633511833157644, -0.3098138631895593, -0.24937350364371635, 0.04583635920425877, -0.3476155814969887, -0.1595165260161643, 0.17603560646019928, 0.021882659540358573, 0.06183515569435956, 0.04121147464858751, 0.06292143607215496, -0.1635975815803897, -0.2951262584338858, 0.38355241682737656, -0.05727643659338355, 0.2276967326195094, -0.035465563025504146, 0.1373314916743093, 0.0086214733581148, -0.03941150300191996, -0.10936164131311521, -0.06679356560008982, 0.10137764713726938, 0.23235349791572582, 0.08600980570948083, 0.1648853740428434, -0.347665712900766, -0.0874116799590012, 0.1088864975935805, 0.17575477656895575, 0.10391917337873977, -0.04584742262512956, -0.33922193499205455, 0.04716093035108627, -0.18654259216608096, -0.19488993165249083, -0.08007218760728504, 0.061164907074520644, 0.052911762679187097, -0.30218152680804267, 0.065444974289489, 0.05617063994557686, -0.013475236819406385, -0.02589046153357916, -0.11060029191319026, -0.031143423801364555, 0.07357399621723246, -0.006389632730183434, -0.018165688478540987, -0.013115662258526641, -0.08176973899379883, -0.10144643179357868, 0.3764567830677986, -0.08046150416588692, -0.22958785411582827, 0.1533343037989067, -0.08950710847131806, -0.14790355953330506, 0.1358355189967033, 0.12186085654754344, 0.1048154174398044, -0.22372918302665323, 0.07115242092061648, -0.07949870770911954, 0.1598893565010943, 0.11477361650410274, -0.02536291764349013, 0.14787008560582363, 0.07377091126376126, 0.032766885108997, 0.12524631800933753, -0.039293216554167336, -0.1005792156841019, -0.3532662711756891, -0.21993948545702413, -0.1466567597187711, 0.02996773682279538, -0.10879800745179599, -0.1145982008542202, 0.38594230189154, 0.07722985504947807, 0.17024054923110757, 0.0356014169822766, 0.1552770675785125, 0.21460219065272823, 0.10212477307594445, -0.012284037149957803, 0.21495011940037143, 0.20893135028476637, 0.11825970907006668, -0.23241765942896575, -0.0714986733167292, 0.2265963515439007]
|
706.1751
|
MacWilliams Identity for Codes with the Rank Metric
|
The MacWilliams identity, which relates the weight distribution of a code to
the weight distribution of its dual code, is useful in determining the weight
distribution of codes. In this paper, we derive the MacWilliams identity for
linear codes with the rank metric, and our identity has a different form than
that by Delsarte. Using our MacWilliams identity, we also derive related
identities for rank metric codes. These identities parallel the binomial and
power moment identities derived for codes with the Hamming metric.
|
cs.IT math.IT
|
the macwilliams identity which relates the weight distribution of a code to the weight distribution of its dual code is useful in determining the weight distribution of codes in this paper we derive the macwilliams identity for linear codes with the rank metric and our identity has a different form than that by delsarte using our macwilliams identity we also derive related identities for rank metric codes these identities parallel the binomial and power moment identities derived for codes with the hamming metric
|
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|
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|
706.1752
|
Partial Inertial Manifolds for infinite-dimensional dynamical systems:
Example for P.D.E.s with a state-dependent delay
|
We propose a new notion of Partial Inertial Manifold to study the long-time
asymptotic behavior of dissipative differential equations. As shown on an
example, such manifolds may exist in the cases when the classical Inertial
manifold does not exist (or not known to exist).
|
math.DS math.AP
|
we propose a new notion of partial inertial manifold to study the longtime asymptotic behavior of dissipative differential equations as shown on an example such manifolds may exist in the cases when the classical inertial manifold does not exist or not known to exist
|
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|
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|
706.1753
|
Concentration of the Spectral Measure for Large Random Matrices with
Stable Entries
|
We derive concentration inequalities for functions of the empirical measure
of large random matrices with infinitely divisible entries and, in particular,
stable ones. We also give concentration results for some other functionals of
these random matrices, such as the largest eigenvalue or the largest singular
value.
|
math.PR math.ST stat.TH
|
we derive concentration inequalities for functions of the empirical measure of large random matrices with infinitely divisible entries and in particular stable ones we also give concentration results for some other functionals of these random matrices such as the largest eigenvalue or the largest singular value
|
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|
[-0.09534948869891789, 0.1426493029575795, -0.026213805575895567, 0.0959469132611285, 0.003798069624716173, -0.13077265836055513, 0.01767149077647406, 0.34214009668516077, -0.26250125815504755, -0.24223703755389736, 0.1597982460668351, -0.36823941427080525, -0.16731533394498832, 0.17892937311578705, -0.03810760276594564, 0.12492858725612599, 0.03446729957004604, 0.07071067186315423, -0.08826077686946678, -0.25540229645760165, 0.35193620476385823, -0.02526594174054006, 0.203834504759668, 0.052979310316479074, 0.071850694473023, -0.0008268349082082632, -0.0324751870787662, 0.018834102959574564, -0.16889574322039666, 0.14051937105377083, 0.2607846000515249, 0.09475832334314675, 0.27690238039940596, -0.37957314110320545, -0.11655834166373572, 0.2550515210579919, 0.08991890489731146, 0.05586125078084676, -0.07141437708481174, -0.25576944462955, 0.1156548761823417, -0.13815647210298188, -0.21761462355599456, -0.10992537665626277, 0.04359873652498683, 0.1405799448814081, -0.3406093914223754, 0.12530689927908775, 0.06088697748339694, 0.032200492192160986, -0.06008879310937355, -0.2915727483189624, 0.05296755924254008, 0.11066698644856882, 0.08399729102687992, -0.11941196526522221, 0.11580724931200562, -0.05361373451254938, -0.07483930399884349, 0.27701027732362726, -0.06393859586071061, -0.24037712067365646, 0.14290853654560837, -0.20307582889116652, -0.1814164691199751, 0.06964775229520771, 0.1817407065840519, 0.12630271733455037, -0.10204374385268791, 0.103229011367227, -0.12954407519377445, 0.1038332715144624, 0.07613146404290329, 0.0778022715214478, 0.07953483659936034, 0.010314342844218987, 0.1975627336246164, 0.13312440963446812, -0.020530401000186153, -0.10023014968180138, -0.30529522247936414, -0.15751550658403532, -0.2706652702358754, 0.11938504289592737, -0.2508643320657227, -0.28218832826393697, 0.37338515047145926, 0.10587119509506485, 0.23028011324451023, 0.1325601918987282, 0.17938859951075004, 0.1601588963100727, 0.04227181736875892, 0.07114353411547515, 0.13132152061861352, 0.19926908278189923, 0.030757840034430443, -0.0864232487814582, 0.09485427795342453, 0.09941623592749238]
|
706.1754
|
Protein structure prediction by an iterative search method
|
We demonstrate a new algorithm for finding protein conformations that
minimize a non-bonded energy function. The new algorithm, called the difference
map, seeks to find an atomic configuration that is simultaneously in two
constraint spaces. The first constraint space is the space of atomic
configurations that have a valid peptide geometry, while the second is the
space of configurations that have a non-bonded energy below a given target.
These two constraint spaces are used to define a deterministic dynamical
system, whose fixed points produce atomic configurations in the intersection of
the two constraint spaces. The rate at which the difference map produces low
energy protein conformations is compared with that of a contemporary search
algorithm, parallel tempering. The results indicate the difference map finds
low energy protein conformations at a significantly higher rate then parallel
tempering.
|
q-bio.BM
|
we demonstrate a new algorithm for finding protein conformations that minimize a nonbonded energy function the new algorithm called the difference map seeks to find an atomic configuration that is simultaneously in two constraint spaces the first constraint space is the space of atomic configurations that have a valid peptide geometry while the second is the space of configurations that have a nonbonded energy below a given target these two constraint spaces are used to define a deterministic dynamical system whose fixed points produce atomic configurations in the intersection of the two constraint spaces the rate at which the difference map produces low energy protein conformations is compared with that of a contemporary search algorithm parallel tempering the results indicate the difference map finds low energy protein conformations at a significantly higher rate then parallel tempering
|
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|
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|
706.1755
|
FreeBSD Mandatory Access Control Usage for Implementing Enterprise
Security Policies
|
FreeBSD was one of the first widely deployed free operating systems to
provide mandatory access control. It supports a number of classic MAC models.
This tutorial paper addresses exploiting this implementation to enforce typical
enterprise security policies of varying complexities.
|
cs.CR
|
freebsd was one of the first widely deployed free operating systems to provide mandatory access control it supports a number of classic mac models this tutorial paper addresses exploiting this implementation to enforce typical enterprise security policies of varying complexities
|
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|
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|
706.1756
|
IBM-1 description of the fission products $^{108,110,112}$Ru
|
IBM-1} calculations for the fission products $^{108,110,112}$Ru have been
carried out. The even-even isotopes of Ru can be described as transitional
nuclei situated between the U(5) (spherical vibrator) and SO(6)
($\gamma$-unstable rotor) symmetries of the Interacting Boson Model. At first,
a Hamiltonian with only one- and two-body terms has been used. Excitation
energies and $B$(E2) ratios of gamma transitions have been calculated. A
satisfactory agreement has been obtained, with the exception of the odd-even
staggering in the quasi-$\gamma$ bands of $^{110,112}$Ru. The observed pattern
is rather similar to the one for a rigid triaxial rotor. A calculation based on
a Hamiltonian with three-body terms was able to remove this discrepancy. The
relation between the IBM and the triaxial rotor model was also examined.
|
nucl-th
|
ibm1 calculations for the fission products 108110112ru have been carried out the eveneven isotopes of ru can be described as transitional nuclei situated between the u5 spherical vibrator and so6 gammaunstable rotor symmetries of the interacting boson model at first a hamiltonian with only one and twobody terms has been used excitation energies and be2 ratios of gamma transitions have been calculated a satisfactory agreement has been obtained with the exception of the oddeven staggering in the quasigamma bands of 110112ru the observed pattern is rather similar to the one for a rigid triaxial rotor a calculation based on a hamiltonian with threebody terms was able to remove this discrepancy the relation between the ibm and the triaxial rotor model was also examined
|
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|
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|
706.1757
|
Basis set convergence of post-CCSD contributions to molecular
atomization energies
|
Basis set convergence of correlation effects on molecular atomization
energies beyond the CCSD (coupled cluster with singles and doubles)
approximation has been studied near the one-particle basis set limit.
Quasiperturbative connected triple excitations, (T), converge more rapidly than
$L^{-3}$ (where $L$ is the highest angular momentum represented in the basis
set), while higher-order connected triples, $T_3-(T)$, converge more slowly --
empirically, $\propto L^{-5/2}$. Quasiperturbative connected quadruple
excitations, (Q), converge smoothly as $\propto L^{-3}$ starting with the
cc-pVTZ basis set, while the cc-pVDZ basis set causes overshooting of the
contribution in highly polar systems. Higher-order connected quadruples display
only weak, but somewhat erratic, basis set dependence. Connected quintuple
excitations converge very rapidly with the basis set, to the point where even
an unpolarized double-zeta basis set yields useful numbers. In cases where
fully iterative CCSDTQ5 (coupled cluster up to connected quintuples)
calculations are not an option, CCSDTQ(5) (i.e., coupled cluster up to
connected quadruples plus a quasiperturbative connected quintuples correction)
cannot be relied upon in the presence of significant nondynamical correlation,
whereas CCSDTQ(5)$_\Lambda$ represents a viable alternative. Connected
quadruples corrections to the core-valence contribution are thermochemically
significant in some systems. [...] We conclude that ``$3\sigma\leq 1$ kJ/mol''
thermochemistry is feasible with current technology, but that the more
ambitious goal of $\pm$10 cm$^{-1}$ accuracy is illusory, at least for
atomization energies.
|
physics.chem-ph
|
basis set convergence of correlation effects on molecular atomization energies beyond the ccsd coupled cluster with singles and doubles approximation has been studied near the oneparticle basis set limit quasiperturbative connected triple excitations t converge more rapidly than l3 where l is the highest angular momentum represented in the basis set while higherorder connected triples t_3t converge more slowly empirically propto l52 quasiperturbative connected quadruple excitations q converge smoothly as propto l3 starting with the ccpvtz basis set while the ccpvdz basis set causes overshooting of the contribution in highly polar systems higherorder connected quadruples display only weak but somewhat erratic basis set dependence connected quintuple excitations converge very rapidly with the basis set to the point where even an unpolarized doublezeta basis set yields useful numbers in cases where fully iterative ccsdtq5 coupled cluster up to connected quintuples calculations are not an option ccsdtq5 ie coupled cluster up to connected quadruples plus a quasiperturbative connected quintuples correction cannot be relied upon in the presence of significant nondynamical correlation whereas ccsdtq5_lambda represents a viable alternative connected quadruples corrections to the corevalence contribution are thermochemically significant in some systems we conclude that 3sigmaleq 1 kjmol thermochemistry is feasible with current technology but that the more ambitious goal of pm10 cm1 accuracy is illusory at least for atomization energies
|
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|
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|
706.1758
|
Statistics of football dynamics
|
We investigate the dynamics of football matches. Our goal is to characterize
statistically the temporal sequence of ball movements in this collective sport
game, searching for traits of complex behavior. Data were collected over a
variety of matches in South American, European and World championships
throughout 2005 and 2006. We show that the statistics of ball touches presents
power-law tails and can be described by $q$-gamma distributions. To explain
such behavior we propose a model that provides information on the
characteristics of football dynamics. Furthermore, we discuss the statistics of
duration of out-of-play intervals, not directly related to the previous
scenario.
|
physics.data-an
|
we investigate the dynamics of football matches our goal is to characterize statistically the temporal sequence of ball movements in this collective sport game searching for traits of complex behavior data were collected over a variety of matches in south american european and world championships throughout 2005 and 2006 we show that the statistics of ball touches presents powerlaw tails and can be described by qgamma distributions to explain such behavior we propose a model that provides information on the characteristics of football dynamics furthermore we discuss the statistics of duration of outofplay intervals not directly related to the previous scenario
|
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|
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|
706.1759
|
A generalized Petviashvili iteration method for scalar and vector
Hamiltonian equations with arbitrary form of nonlinearity
|
The Petviashvili's iteration method has been known as a rapidly converging
numerical algorithm for obtaining fundamental solitary wave solutions of
stationary scalar nonlinear wave equations with power-law nonlinearity: \
$-Mu+u^p=0$, where $M$ is a positive definite self-adjoint operator and $p={\rm
const}$. In this paper, we propose a systematic generalization of this method
to both scalar and vector Hamiltonian equations with arbitrary form of
nonlinearity and potential functions. For scalar equations, our generalized
method requires only slightly more computational effort than the original
Petviashvili method.
|
nlin.PS
|
the petviashvilis iteration method has been known as a rapidly converging numerical algorithm for obtaining fundamental solitary wave solutions of stationary scalar nonlinear wave equations with powerlaw nonlinearity muup0 where m is a positive definite selfadjoint operator and prm const in this paper we propose a systematic generalization of this method to both scalar and vector hamiltonian equations with arbitrary form of nonlinearity and potential functions for scalar equations our generalized method requires only slightly more computational effort than the original petviashvili method
|
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|
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|
706.176
|
A Unique Determination of the Effective Potential in Terms of
Renormalization Group Functions
|
The perturbative effective potential V in the massless $\lambda\phi^4$ model
with a global O(N) symmetry is uniquely determined to all orders by the
renormalization group functions alone when the Coleman-Weinberg renormalization
condition $\frac{d^4V}{d\phi^4}|_{\phi = \mu} = \lambda$ is used, where $\mu$
represents the renormalization scale. Systematic methods are developed to
express the n-loop effective potential in the Coleman-Weinberg scheme in terms
of the known n-loop minimal subtraction (MS) renormalization-group functions.
Moreover, it also proves possible to sum the leading- and
subsequent-to-leading-logarithm contributions to V. An essential element of
this analysis is a conversion of the renormalization group functions in the
Coleman-Weinberg scheme to the renormalization group functions in the MS
scheme. As an example, the explicit five-loop effective potential is obtained
from the known five-loop MS renormalization group functions and we explicitly
sum the leading logarithm (LL), next-to-leading (NLL), and further
subleading-logarithm contributions to V. Extensions of these results to
massless scalar QED are also presented. Because massless scalar QED has two
couplings, conversion of the RG functions from the MS scheme to the CW scheme
requires the use of multi-scale renormalization group methods.
|
hep-ph
|
the perturbative effective potential v in the massless lambdaphi4 model with a global on symmetry is uniquely determined to all orders by the renormalization group functions alone when the colemanweinberg renormalization condition fracd4vdphi4_phi mu lambda is used where mu represents the renormalization scale systematic methods are developed to express the nloop effective potential in the colemanweinberg scheme in terms of the known nloop minimal subtraction ms renormalizationgroup functions moreover it also proves possible to sum the leading and subsequenttoleadinglogarithm contributions to v an essential element of this analysis is a conversion of the renormalization group functions in the colemanweinberg scheme to the renormalization group functions in the ms scheme as an example the explicit fiveloop effective potential is obtained from the known fiveloop ms renormalization group functions and we explicitly sum the leading logarithm ll nexttoleading nll and further subleadinglogarithm contributions to v extensions of these results to massless scalar qed are also presented because massless scalar qed has two couplings conversion of the rg functions from the ms scheme to the cw scheme requires the use of multiscale renormalization group methods
|
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|
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|
706.1761
|
Extraspecial Two-Groups, Generalized Yang-Baxter Equations and Braiding
Quantum Gates
|
In this paper we describe connections among extraspecial 2-groups, unitary
representations of the braid group and multi-qubit braiding quantum gates. We
first construct new representations of extraspecial 2-groups. Extending the
latter by the symmetric group, we construct new unitary braid representations,
which are solutions to generalized Yang-Baxter equations and use them to
realize new braiding quantum gates. These gates generate the GHZ
(Greenberger-Horne-Zeilinger) states, for an arbitrary (particularly an
\emph{odd}) number of qubits, from the product basis. We also discuss the
Yang-Baxterization of the new braid group representations, which describes
unitary evolution of the GHZ states. Our study suggests that through their
connection with braiding gates, extraspecial 2-groups and the GHZ states may
play an important role in quantum error correction and topological quantum
computing.
|
quant-ph hep-th math-ph math.MP
|
in this paper we describe connections among extraspecial 2groups unitary representations of the braid group and multiqubit braiding quantum gates we first construct new representations of extraspecial 2groups extending the latter by the symmetric group we construct new unitary braid representations which are solutions to generalized yangbaxter equations and use them to realize new braiding quantum gates these gates generate the ghz greenbergerhornezeilinger states for an arbitrary particularly an emphodd number of qubits from the product basis we also discuss the yangbaxterization of the new braid group representations which describes unitary evolution of the ghz states our study suggests that through their connection with braiding gates extraspecial 2groups and the ghz states may play an important role in quantum error correction and topological quantum computing
|
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|
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|
706.1762
|
The Detailed Forms of the LMC Cepheid PL and PLC Relations
|
Possible deviations from linearity of the LMC Cepheid PL and PLC relations
are investigated. Two datasets are studied, respectively from the OGLE and
MACHO projects. A nonparametric test, based on linear regression residuals,
suggests that neither PL relation is linear. If colour dependence is allowed
for then the MACHO PL relation is found to deviate more significantly from the
linear, while the OGLE PL relation is consistent with linearity. These finding
are confirmed by fitting "Generalised Additive Models" (nonparametric
regression functions) to the two datasets. Colour dependence is shown to be
nonlinear in both datasets, distinctly so in the case of the MACHO Cepheids. It
is also shown that there is interaction between the period and colour functions
in the MACHO data.
|
astro-ph
|
possible deviations from linearity of the lmc cepheid pl and plc relations are investigated two datasets are studied respectively from the ogle and macho projects a nonparametric test based on linear regression residuals suggests that neither pl relation is linear if colour dependence is allowed for then the macho pl relation is found to deviate more significantly from the linear while the ogle pl relation is consistent with linearity these finding are confirmed by fitting generalised additive models nonparametric regression functions to the two datasets colour dependence is shown to be nonlinear in both datasets distinctly so in the case of the macho cepheids it is also shown that there is interaction between the period and colour functions in the macho data
|
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|
[-0.015095901455096596, 0.07137254935681636, -0.1653114007098875, 0.13467372491761095, -0.13116204981753204, -0.17100529723464833, 0.04703665820148881, 0.43468692437669293, -0.26469415588090656, -0.30631659266951144, 0.042808767937726845, -0.3502125068582961, -0.13794660046849339, 0.278905301446431, -0.078226186736338, 0.06216622379486312, 0.06578488705191211, -0.06562660709710517, -0.053855913913079735, -0.3164028283819312, 0.28459314513401907, -0.05009163874888518, 0.28480467742278437, -0.0536845073935988, 0.030128515673778403, -0.02715586004473391, -0.13449338147513087, 0.052991232933995665, -0.08617520030670452, 0.09065829493300073, 0.22737138214718278, 0.13678499458159213, 0.18629973743599457, -0.27684837022078695, -0.15186359796703594, 0.126461539390787, 0.1157227117362142, 0.02108766413596745, -0.010572397294783483, -0.2528289208383315, 0.06658268968773182, -0.10129423543703972, -0.06827754844896129, -0.02067720905694439, 0.11386056683316338, 0.056351078467607715, -0.2690242902436828, 0.13015356145920345, 0.0337902109489822, 0.12350551662661258, -0.06103516938393844, -0.13114332717644875, -0.09024010942370982, 0.05627087725814982, 0.08663536321188582, 0.046921827539335936, 0.07697279634503801, -0.1077311606925042, -0.08326246035972336, 0.3774406063965842, -0.10351023420722025, -0.12297922695727377, 0.17045935356348266, -0.15104935508694683, -0.15131999967719015, 0.02147683022604858, 0.1256944111960589, 0.06022630463216881, -0.2263173064079563, 0.10923802664696208, -0.03126205022630022, 0.2448031221684374, 0.08863578465019094, -0.0014860817177801348, 0.22082525859663232, 0.12969649487678878, 0.02233282781442719, 0.101274315049284, -0.1562874039203753, -0.09728082749643363, -0.2613344828247047, -0.025353607118557223, -0.1612842101909098, 0.0037017698683842757, -0.15963390277907133, -0.12420703829256588, 0.314736470801481, 0.09452806948684156, 0.19373472787241344, 0.12272983627225899, 0.2715124661316637, 0.12196891017441379, 0.13096221619570478, 0.10437142895152945, 0.3563014944007651, 0.15824865087385853, 0.0320352321761645, -0.2359960057112373, 0.1066754764426866, -0.023796725399853266]
|
706.1763
|
A discrete mean value of the derivative of the Riemann zeta function
|
In this article we compute a discrete mean value of the derivative of the
Riemann zeta function. This mean value will be important for several
applications concerning the size of $\zeta'(\rho)$ where $\zeta(s)$ is the
Riemann zeta function and $\rho$ is a non-trivial zero of the Riemann zeta
function.
|
math.NT
|
in this article we compute a discrete mean value of the derivative of the riemann zeta function this mean value will be important for several applications concerning the size of zetarho where zetas is the riemann zeta function and rho is a nontrivial zero of the riemann zeta function
|
[['in', 'this', 'article', 'we', 'compute', 'a', 'discrete', 'mean', 'value', 'of', 'the', 'derivative', 'of', 'the', 'riemann', 'zeta', 'function', 'this', 'mean', 'value', 'will', 'be', 'important', 'for', 'several', 'applications', 'concerning', 'the', 'size', 'of', 'zetarho', 'where', 'zetas', 'is', 'the', 'riemann', 'zeta', 'function', 'and', 'rho', 'is', 'a', 'nontrivial', 'zero', 'of', 'the', 'riemann', 'zeta', 'function']]
|
[-0.22096802746610983, 0.07398060201762283, -0.17700677130570902, 0.10875674973869202, -0.09282809932126987, -0.05147431834543846, 0.017349687499963507, 0.2676899213419885, -0.2858226901794575, -0.21338450519025934, 0.1231754408669373, -0.24276342395008826, -0.1763146130453643, 0.1918901457850422, -0.023947996144392053, 0.09617124472231585, -0.018013536844554603, 0.10608183400591417, -0.15477224213204213, -0.2799030729778567, 0.37910544698848864, -0.023984045103876566, 0.1664672573192083, 0.1856283307484142, 0.06698492739577683, -0.008403474721601424, 0.0012581872858335168, -0.021400242549728374, -0.17098673740972062, 0.08191306022356967, 0.24260800229195428, 0.04594544864886878, 0.3379945656930914, -0.30688902294757414, -0.20632659045181104, 0.15952042941650263, 0.10013106763743017, -0.07967793827458304, 0.06370705318618186, -0.1902688888652364, 0.11041123110192771, -0.12224262128869186, -0.19251865292994344, 0.015132002228376816, 0.08537351020744868, 0.05234239375864973, -0.28240065911917817, 0.1343309008611404, -0.045952145746738025, 0.05702752397604743, -0.08414818259070114, -0.22793379062976765, 0.02983311286234126, 0.08396316007996092, 0.16710038090656912, 0.14231425059046976, 0.08727996929415635, -0.1961379411098148, -0.00398602894488342, 0.31068913507446344, -0.09702240238536378, -0.264847177779302, 0.08155790960644277, -0.17171955629422955, -0.15125776063270716, 0.08310023437880605, 0.13017369926507985, 0.2229810194397459, -0.04230965966624873, 0.15658757930540726, -0.09809396140353412, 0.13258194003482254, 0.10040822727795766, -0.06273942357119248, 0.23310143667824415, 0.06804243243318431, 0.06068311053879407, 0.17740000191154148, -0.09760403573484522, -0.06970796602711614, -0.4040722392347394, -0.3224003331507651, -0.2497313491505932, 0.13593056270548579, -0.14517599929626604, -0.26817784055459254, 0.4319460029352684, 0.12647142896086586, 0.18709673535801014, 0.1624055866731749, 0.24441378981787332, 0.2663040077028682, 0.03709179242806775, 0.01164933185720322, 0.11181694953417291, 0.17547531702973862, 0.0341626247010973, -0.18364870903671396, 0.04049254007333396, 0.14653527367936106]
|
706.1764
|
Classical potential describes martensitic phase transformations between
the $\alpha$, $\beta$ and $\omega$ titanium phases
|
A description of the martensitic transformations between the $\alpha$,
$\beta$ and $\omega$ phases of titanium that includes nucleation and growth
requires an accurate classical potential. Optimization of the parameters of a
modified embedded atom potential to a database of density-functional
calculations yields an accurate and transferable potential as verified by
comparison to experimental and density functional data for phonons, surface and
stacking fault energies and energy barriers for homogeneous martensitic
transformations. Molecular dynamics simulations map out the
pressure-temperature phase diagram of titanium. For this potential the
martensitic phase transformation between $\alpha$ and $\beta$ appears at
ambient pressure and 1200 K, between $\alpha$ and $\omega$ at ambient
conditions, between $\beta$ and $\omega$ at 1200 K and pressures above 8 GPa,
and the triple point occurs at 8GPa and 1200 K. Molecular dynamics explorations
of the dynamics of the martensitic $\alpha-\omega$ transformation show a
fast-moving interface with a low interfacial energy of 30 meV/\AA$^2$. The
potential is applicable to the study of defects and phase transformations of
Ti.
|
cond-mat.mtrl-sci
|
a description of the martensitic transformations between the alpha beta and omega phases of titanium that includes nucleation and growth requires an accurate classical potential optimization of the parameters of a modified embedded atom potential to a database of densityfunctional calculations yields an accurate and transferable potential as verified by comparison to experimental and density functional data for phonons surface and stacking fault energies and energy barriers for homogeneous martensitic transformations molecular dynamics simulations map out the pressuretemperature phase diagram of titanium for this potential the martensitic phase transformation between alpha and beta appears at ambient pressure and 1200 k between alpha and omega at ambient conditions between beta and omega at 1200 k and pressures above 8 gpa and the triple point occurs at 8gpa and 1200 k molecular dynamics explorations of the dynamics of the martensitic alphaomega transformation show a fastmoving interface with a low interfacial energy of 30 mevaa2 the potential is applicable to the study of defects and phase transformations of ti
|
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|
[-0.13229333023058185, 0.17028052200081462, -0.06723244755433491, 0.010415965738897043, 0.010060125276031175, -0.1315383912002421, 0.12533619402380414, 0.39520338860744364, -0.27378808743466276, -0.3229208528288606, 0.008726000856658646, -0.29837171090430165, -0.11102411544570386, 0.1559103206129666, 0.08991114462512624, 0.03474340050941311, -0.007591144157330231, -0.006780348807932383, -0.13667251716412784, -0.15994995454303831, 0.2729176861172295, 0.06730221528335507, 0.25999041841399056, 0.0684656929357976, 0.06395712284531152, -0.04113989943429457, 0.06791756904111748, -0.0008849855119654214, -0.21206475740056857, 0.041392079010291634, 0.24006168322121524, 0.006451001971488796, 0.20003392934625272, -0.41480182257133075, -0.23581164253837744, 0.03421062580309808, 0.05912723310897688, 0.0629659151765013, -0.07627803096772139, -0.24330739815598804, 0.0578384547787494, -0.08572115649536521, -0.15018526816315733, -0.08419443506451887, 0.05506191679686084, 0.02866362603921275, -0.2838704900154059, 0.11035304389386795, 0.02229987051764346, 0.12410067963509096, -0.12423432746857226, -0.133874300456359, -0.09907153943632112, 0.05945690240253728, -0.0042867211622174784, 0.0853706828910431, 0.20110019859128508, -0.10089317575259785, -0.01580759069702801, 0.43554530461060714, -0.04403711855692048, -0.05802486026771816, 0.21956347690541747, -0.13329264433945442, -0.09884094208456486, 0.22340466803871095, 0.1004075578032398, 0.08712722234714058, -0.1388550482757659, 0.10143975184964582, 0.11022970078902948, 0.1939469384352455, 0.10791627004923557, -0.03658122479276036, 0.19180257158516625, 0.1701572067335708, 0.03386404797861196, 0.1299080776312972, -0.11134411300902805, -0.0761603180246136, -0.2908282465847063, -0.19577628635104988, -0.13097478500679585, 0.016472738505486983, -0.13505514656878723, -0.17055034925824547, 0.3302927459365722, 0.0786331117276596, 0.1623054736080658, -0.027062090436355716, 0.21689788720301206, 0.06697962917485667, 0.025360415111778372, 0.021236039358696127, 0.1959131260778396, 0.17696094276321805, 0.11648774061475443, -0.25987882114643884, 0.022078014262222563, 0.01881867757835706]
|
706.1765
|
Extreme values of zeta prime rho
|
In this article we exhibit small and large values of $\zeta'(\rho)$ by
applying Soundararajan's resonance method. Our results assume the Riemann
hypothesis.
|
math.NT
|
in this article we exhibit small and large values of zetarho by applying soundararajans resonance method our results assume the riemann hypothesis
|
[['in', 'this', 'article', 'we', 'exhibit', 'small', 'and', 'large', 'values', 'of', 'zetarho', 'by', 'applying', 'soundararajans', 'resonance', 'method', 'our', 'results', 'assume', 'the', 'riemann', 'hypothesis']]
|
[-0.10839895379136909, 0.08684205380268395, -0.08394616221035407, 0.04364799984878945, -0.03487709774212404, -0.07929228754206137, 0.04166209780272435, 0.2922008437189189, -0.19651224311779847, -0.32494302771308203, 0.07681018251142549, -0.20621251145547087, -0.21813120498237284, 0.22642158272422172, -0.061074468307197094, 0.04239117762203519, 0.1353226459415799, -0.03487399830059572, -0.031588050282814285, -0.24904154088686814, 0.3996797180311246, -0.026323136937042527, 0.28294996527785604, 0.11799847281707282, 0.056990934260697526, -0.0062541449654170056, -0.014325318455865437, 0.02511591667478735, -0.15207772824743931, 0.11733394061130556, 0.2141732954504815, 0.07408025598322804, 0.274333501403982, -0.39794293232262135, -0.13567258752035824, 0.1003117962655696, 0.09016846879173747, 0.09042914093218067, -0.05427587468346411, -0.29416764921254734, 0.17054000505330888, -0.1526558753526346, -0.16523543421433054, -0.10705864717337218, -0.053742396899245, 0.02951790891926397, -0.27591310699724336, 0.10881219778887251, 0.09931364978282628, 0.10592537589201872, -0.09555192607116293, -0.1599194297821007, 0.10877091400536963, 0.023068198341537605, 0.15459481499750505, 0.03267959594218568, 0.07272869659672407, -0.04129441623279655, -0.049149428070946174, 0.27488088540055533, -0.14386839377270502, -0.23238580774473536, 0.152419714929155, -0.20564869048327886, -0.19021872845901686, 0.11762622557580471, 0.12451120516793295, 0.1929561186327853, -0.07029262496243147, 0.11916717512014491, -0.10647569490935314, 0.13194054229692978, 0.06767363943667574, -0.07617082125083967, 0.15785592337223617, 0.13814258177510716, -0.015147303188727661, 0.1365892887644639, -0.14504089254081587, -0.046480541980021044, -0.31921749866821547, -0.15442155067681929, -0.2379619704390114, 0.05988964006643404, -0.08234071128258207, -0.13770061523907565, 0.3596200909126889, 0.21396127489226108, 0.2503619280389764, 0.1246840762482448, 0.23645886016840284, 0.14769291965058073, 0.09614918516440825, 0.059766190465201034, 0.23007810386744412, 0.11545090632386167, 0.046759643676606094, -0.17079051753336733, 0.029263005528429694, 0.0276404704305936]
|
706.1766
|
Orbital liquid in ferromagnetic manganites: The orbital Hubbard model
for $e_g$ electrons
|
We have analyzed the symmetry properties and the ground state of an orbital
Hubbard model with two orbital flavors, describing a partly filled
spin-polarized $e_g$ band on a cubic lattice, as in ferromagnetic manganites.
We demonstrate that the off-diagonal hopping responsible for transitions
between $x^2-y^2$ and $3z^2-r^2$ orbitals, and the absence of SU(2) invariance
in orbital space, have important implications. One finds that superexchange
contributes in all orbital ordered states, the Nagaoka theorem does not apply,
and the kinetic energy is much enhanced as compared with the spin case.
Therefore, orbital ordered states are harder to stabilize in the Hartree-Fock
approximation (HFA), and the onset of a uniform ferro-orbital polarization and
antiferro-orbital instability are similar to each other, unlike in spin case.
Next we formulate a cubic (gauge) invariant slave boson approach using the
orbitals with complex coefficients. In the mean-field approximation it leads to
the renormalization of the kinetic energy, and provides a reliable estimate for
the ground state energy of the disordered state. Using this approach one finds
that the HFA fails qualitatively in the regime of large Coulomb repulsion
$U\to\infty$ -- the orbital order is unstable, and instead a strongly
correlated orbital liquid with disordered orbitals is realized at any electron
filling.
|
cond-mat.str-el
|
we have analyzed the symmetry properties and the ground state of an orbital hubbard model with two orbital flavors describing a partly filled spinpolarized e_g band on a cubic lattice as in ferromagnetic manganites we demonstrate that the offdiagonal hopping responsible for transitions between x2y2 and 3z2r2 orbitals and the absence of su2 invariance in orbital space have important implications one finds that superexchange contributes in all orbital ordered states the nagaoka theorem does not apply and the kinetic energy is much enhanced as compared with the spin case therefore orbital ordered states are harder to stabilize in the hartreefock approximation hfa and the onset of a uniform ferroorbital polarization and antiferroorbital instability are similar to each other unlike in spin case next we formulate a cubic gauge invariant slave boson approach using the orbitals with complex coefficients in the meanfield approximation it leads to the renormalization of the kinetic energy and provides a reliable estimate for the ground state energy of the disordered state using this approach one finds that the hfa fails qualitatively in the regime of large coulomb repulsion utoinfty the orbital order is unstable and instead a strongly correlated orbital liquid with disordered orbitals is realized at any electron filling
|
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|
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|
706.1767
|
VHE astrophysics: recent developments
|
We review the current status, and some open issues, of VHE astrophysics.
|
astro-ph
|
we review the current status and some open issues of vhe astrophysics
|
[['we', 'review', 'the', 'current', 'status', 'and', 'some', 'open', 'issues', 'of', 'vhe', 'astrophysics']]
|
[-0.10030728578567505, 0.15557728979426125, 0.08289100090041757, 0.17277069948613644, -0.23365758080035448, -0.08726388945554693, 0.0675175291641305, 0.37053624882052344, -0.2800061637535691, -0.3497755900025368, 0.19111815626577786, -0.29067369488378364, -0.06079309309522311, 0.2745627942495048, -0.12907481178020438, 0.03420649034281572, 0.21868983997652927, -0.06205985648557544, -0.02005441184155643, -0.28971443325281143, 0.3167267407601078, 0.12969414715189487, 0.22556478468080363, 0.2776272241026163, 0.0431017205119133, -0.08586300377889226, -0.18804324410545328, -0.05746860837098211, -0.28260632666448754, 0.14553570095449686, 0.34259453291694325, 0.293454446674635, 0.32051953456054133, -0.41266195786496, -0.16521150642074645, 0.012015455712874731, 0.09291119130405907, 0.07442755038694789, -0.1386366527682791, -0.3019492107753952, -0.016643345744038623, -0.18610477540642023, -0.21957097885509333, 0.08260251674801111, 0.0047370316460728645, 0.11161298304796219, 0.03684959188103676, -0.00838081662853559, -0.04995687026530504, 0.033041612788413964, -0.1756680024166902, -0.26865771956120926, 0.21544102455178896, 0.13972170328876624, 0.15382312440002957, 0.09591882035601884, 0.12150934094097465, -0.31788303578893345, -0.2307729528596004, 0.3286907005434235, 0.037791061137492456, -0.07406170448909204, 0.2255611315680047, -0.19844954771300158, -0.3567810545985897, -0.09336699126288295, 0.125187742523849, 0.02441230183467269, -0.20532933226786554, 0.18221466677399198, 0.06880119567116101, 0.07528306841656256, -0.04082323928984503, 0.13028504034931152, 0.3344780569896102, 0.2708874930006762, -0.008873857635383805, 0.04165593247550229, -0.13867641628409424, -0.06238949174682299, -0.40844352667530376, -0.08289968711324036, -0.0008623342340191206, 0.15902442019432783, 0.11506423808289885, -0.1225256072357297, 0.5345557352217535, 0.2704859059303999, 0.1378015372902155, -0.15069843149588755, 0.32981724850833416, -0.04145669719825188, -0.17686522006988525, 0.1826411144187053, 0.24662687766491823, 0.14528637930440405, 0.17595987347885966, -0.20657330627242723, 0.009429629077203572, -0.0626967449982961]
|
706.1768
|
The black hole in the throat - thermodynamics of strongly coupled
cascading gauge theories
|
We numerically construct black hole solutions corresponding to the
deconfined, chirally symmetric phase of strongly coupled cascading gauge
theories at various temperatures. We compute the free energy as a function of
the temperature, and we show that it becomes positive below some critical
temperature, indicating the possibility of a first order phase transition at
which the theory deconfines and restores the chiral symmetry.
|
hep-th
|
we numerically construct black hole solutions corresponding to the deconfined chirally symmetric phase of strongly coupled cascading gauge theories at various temperatures we compute the free energy as a function of the temperature and we show that it becomes positive below some critical temperature indicating the possibility of a first order phase transition at which the theory deconfines and restores the chiral symmetry
|
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|
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|
706.1769
|
Higher Derivative Corrections, Dimensional Reduction and Ehlers Duality
|
Motivated by applications to black hole physics and duality, we study the
effect of higher derivative corrections on the dimensional reduction of
four-dimensional Einstein, Einstein Liouville and Einstein-Maxwell gravity to
one direction, as appropriate for stationary, spherically symmetric solutions.
We construct a field redefinition scheme such that the one-dimensional
Lagrangian is corrected only by powers of first derivatives of the fields,
eliminating spurious modes and providing a suitable starting point for
quantization. We show that the Ehlers symmetry, broken by the leading $R^2$
corrections in Einstein-Liouville gravity, can be restored by including
contributions of Taub-NUT instantons. Finally, we give a preliminary discussion
of the duality between higher-derivative F-term corrections on the vector and
hypermultiplet branches in N=2 supergravity in four dimensions.
|
hep-th
|
motivated by applications to black hole physics and duality we study the effect of higher derivative corrections on the dimensional reduction of fourdimensional einstein einstein liouville and einsteinmaxwell gravity to one direction as appropriate for stationary spherically symmetric solutions we construct a field redefinition scheme such that the onedimensional lagrangian is corrected only by powers of first derivatives of the fields eliminating spurious modes and providing a suitable starting point for quantization we show that the ehlers symmetry broken by the leading r2 corrections in einsteinliouville gravity can be restored by including contributions of taubnut instantons finally we give a preliminary discussion of the duality between higherderivative fterm corrections on the vector and hypermultiplet branches in n2 supergravity in four dimensions
|
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|
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|
706.177
|
Cracking the Supersolid
|
We prepresent an overview of the status of experiment and theory on the
supersolid state of matter.
|
cond-mat.supr-con cond-mat.dis-nn
|
we prepresent an overview of the status of experiment and theory on the supersolid state of matter
|
[['we', 'prepresent', 'an', 'overview', 'of', 'the', 'status', 'of', 'experiment', 'and', 'theory', 'on', 'the', 'supersolid', 'state', 'of', 'matter']]
|
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|
706.1771
|
The fundamental progroupoid of a general topos
|
It is well known that the category of covering projections (that is, locally
constant objects) of a locally connected topos is equivalent to the classifying
topos of a strict progroupoid (or, equivalently, a localic prodiscrete
groupoid), the \emph{fundamental progroupoid}, and that this progroupoid
represents first degree cohomology. In this paper we generalize these results
to an arbitrary topos. The fundamental progroupoid is now a localic
progroupoid, and can not be replaced by a localic groupoid. The classifying
topos in not any more a Galois topos. Not all locally constant objects can be
considered as covering projections. The key contribution of this paper is a
novel definition of covering projection for a general topos, which coincides
with the usual definition when the topos is locally connected. The results in
this paper were presented in a talk at the Category Theory Conference,
Vancouver July 2004.
|
math.CT math.AT
|
it is well known that the category of covering projections that is locally constant objects of a locally connected topos is equivalent to the classifying topos of a strict progroupoid or equivalently a localic prodiscrete groupoid the emphfundamental progroupoid and that this progroupoid represents first degree cohomology in this paper we generalize these results to an arbitrary topos the fundamental progroupoid is now a localic progroupoid and can not be replaced by a localic groupoid the classifying topos in not any more a galois topos not all locally constant objects can be considered as covering projections the key contribution of this paper is a novel definition of covering projection for a general topos which coincides with the usual definition when the topos is locally connected the results in this paper were presented in a talk at the category theory conference vancouver july 2004
|
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|
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|
706.1772
|
The GRB afterglow onset observed by REM: fireball Lorentz factor and
afterglow fluence
|
We report observations of the early light curves of GRB 060418 and GRB
060607A, carried out with the pink robotic telescope REM. A clear peak is
detected for both events, which is interpreted as the onset of the afterglow,
that is the time at which the fireball starts decelerating. This detection
allows to directly measure the initial fireball Lorentz factor, which was found
to be Gamma_0 ~ 400 for both events, fully confirming the ultrarelativistic
nature of gamma-ray burst fireballs. Sampling the light curve before the peak
also allows to compute the bolometric fluence of the afterglow, which is 16% of
the prompt one in the case of GRB 060418.
|
astro-ph
|
we report observations of the early light curves of grb 060418 and grb 060607a carried out with the pink robotic telescope rem a clear peak is detected for both events which is interpreted as the onset of the afterglow that is the time at which the fireball starts decelerating this detection allows to directly measure the initial fireball lorentz factor which was found to be gamma_0 400 for both events fully confirming the ultrarelativistic nature of gammaray burst fireballs sampling the light curve before the peak also allows to compute the bolometric fluence of the afterglow which is 16 of the prompt one in the case of grb 060418
|
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|
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|
706.1773
|
The Stokes phenomenon in the confluence of the hypergeometric equation
using Riccati equation
|
In this paper we study the confluence of two regular singular points of the
hypergeometric equation into an irregular one. We study the consequence of the
divergence of solutions at the irregular singular point for the unfolded
system. Our study covers a full neighborhood of the origin in the confluence
parameter space. In particular, we show how the divergence of solutions at the
irregular singular point explains the presence of logarithmic terms in the
solutions at a regular singular point of the unfolded system. For this study,
we consider values of the confluence parameter taken in two sectors covering
the complex plane. In each sector, we study the monodromy of a first integral
of a Riccati system related to the hypergeometric equation. Then, on each
sector, we include the presence of logarithmic terms into a continuous
phenomenon and view a Stokes multiplier related to a 1-summable solution as the
limit of an obstruction that prevents a pair of eigenvectors of the monodromy
operators, one at each singular point, to coincide.
|
math.CA math.DS
|
in this paper we study the confluence of two regular singular points of the hypergeometric equation into an irregular one we study the consequence of the divergence of solutions at the irregular singular point for the unfolded system our study covers a full neighborhood of the origin in the confluence parameter space in particular we show how the divergence of solutions at the irregular singular point explains the presence of logarithmic terms in the solutions at a regular singular point of the unfolded system for this study we consider values of the confluence parameter taken in two sectors covering the complex plane in each sector we study the monodromy of a first integral of a riccati system related to the hypergeometric equation then on each sector we include the presence of logarithmic terms into a continuous phenomenon and view a stokes multiplier related to a 1summable solution as the limit of an obstruction that prevents a pair of eigenvectors of the monodromy operators one at each singular point to coincide
|
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|
[-0.18868811940774322, 0.010692620629561134, -0.09840839028851513, 0.06918601552435362, -0.03903995865188977, -0.0779404563610168, 0.03331603669417638, 0.24661802572800834, -0.3038886631674626, -0.18541120275964632, 0.12737177957862836, -0.3091826677596306, -0.17054091036210164, 0.16158414008643698, -0.052769120401867174, 0.0271653376349337, 0.044999333772370045, 0.07351454896989333, -0.11650544973501169, -0.21368066153749277, 0.42083631859927934, -0.03586657585024916, 0.21079702969120048, 0.013851174750529669, 0.12953870007631313, 0.013871610952157746, -0.0035280464737511732, 0.001329837175024509, -0.13785773268785254, 0.10149044971913099, 0.2298742699875113, 0.06055729472735787, 0.2642482118571506, -0.3913885156678803, -0.15373392586103257, 0.1437543896246044, 0.15051616413847488, 0.0740707033957519, -0.002290434097898576, -0.2568543344626532, 0.08583955434561871, -0.13128101774765288, -0.2346923696644166, -0.03177197328049635, -0.015741515721139663, 0.03426397570874542, -0.2368012325728641, 0.044222053395145955, 0.06798842324163107, 0.046039289761992064, -0.08801200072938467, -0.07669177287162336, -0.024596168756868472, 0.10827777969705708, 0.06867165549261058, -0.005375004856956794, 0.0664966644554892, -0.16241487802335006, -0.0724302072173861, 0.3553060964859255, -0.06955499632955145, -0.21035050345500864, 0.15282902459559194, -0.16992011988699873, -0.1686651997049065, 0.1546507520820288, 0.15586055474328425, 0.1244646918042289, -0.1298046667840989, 0.1414101308071301, -0.06552828462684855, 0.11511194756706519, 0.10032089615706355, 0.009816202721284592, 0.1998924231101923, 0.12482904496958808, 0.10379536056014545, 0.17041704988874057, -0.05660317983779618, -0.13670296370983123, -0.3996230970191605, -0.1813663623049198, -0.1359140303942909, 0.05311942774912014, -0.12171452968811054, -0.2140916801386458, 0.46327873159693006, 0.11693099158103852, 0.24442767575109267, 0.030098097448182457, 0.2334369107752162, 0.16366835929289023, 0.03724127782727866, 0.02393830060849295, 0.1942566048737396, 0.111057097890743, 0.09820449849426308, -0.22119560370714786, -0.01952345254831016, 0.13825446352985798]
|
706.1774
|
Functional Methods in the Generalized Dicke Model
|
The Dicke model describes an ensemble of N identical two-level atoms (qubits)
coupled to a single mode of a bosonic field. The fermion Dicke model should be
obtained by changing the atomic pseudo-spin operators by a linear combination
of Fermi operators. The generalized fermion Dicke model is defined introducing
different coupling constants between the single mode of the bosonic field and
the reservoir. In the thermodynamic limit, the fermion Dicke model can be
analized using the path integral approach with functional method. The system
exhibits a second order phase transition from normal to superrandiance at some
critical temperature with the presence of a condensate. We evaluate the
critical transition temperature and present the spectrum of the collective
bosonic excitations. There is quantum phantum critical behavior when the
coupling constants satisfy an especific condition. Two particular situations
are analyzed. First, we present the spectrum of the collective bosonic
excitations in the case using the rotating-wave approximation, recovering the
well know results. Second, the case only considering virtual processes. In the
last case, it is possible to have a superradiance phase when only virtual
processes are introduced in the interaction Hamiltonian. Here also appears a
quantum phase transition at some critical coupling, and for larger values for
the critical coupling, the system enter in this superradiant phase with a
Goldstone mode.
|
quant-ph
|
the dicke model describes an ensemble of n identical twolevel atoms qubits coupled to a single mode of a bosonic field the fermion dicke model should be obtained by changing the atomic pseudospin operators by a linear combination of fermi operators the generalized fermion dicke model is defined introducing different coupling constants between the single mode of the bosonic field and the reservoir in the thermodynamic limit the fermion dicke model can be analized using the path integral approach with functional method the system exhibits a second order phase transition from normal to superrandiance at some critical temperature with the presence of a condensate we evaluate the critical transition temperature and present the spectrum of the collective bosonic excitations there is quantum phantum critical behavior when the coupling constants satisfy an especific condition two particular situations are analyzed first we present the spectrum of the collective bosonic excitations in the case using the rotatingwave approximation recovering the well know results second the case only considering virtual processes in the last case it is possible to have a superradiance phase when only virtual processes are introduced in the interaction hamiltonian here also appears a quantum phase transition at some critical coupling and for larger values for the critical coupling the system enter in this superradiant phase with a goldstone mode
|
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|
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|
706.1775
|
Galaxy-CMB Cross-Correlation as a Probe of Alternative Models of Gravity
|
Bekenstein's alternative to general relativity, TeVeS, reduces to Modified
Newtonian Dynamics (MOND) in the galactic limit. On cosmological scales, the
(potential well <-> overdensity) relationship is quite different than in
standard general relativity. Here we investigate the possibility of
cross-correlating galaxies with the cosmic microwave background (CMB) to probe
this relationship. At redshifts of order 2, the sign of the CMB-galaxy
correlation differs in TeVeS from that in general relativity. We show that this
effect is detectable and hence can serve as a powerful discriminator of these
two models of gravity.
|
astro-ph
|
bekensteins alternative to general relativity teves reduces to modified newtonian dynamics mond in the galactic limit on cosmological scales the potential well overdensity relationship is quite different than in standard general relativity here we investigate the possibility of crosscorrelating galaxies with the cosmic microwave background cmb to probe this relationship at redshifts of order 2 the sign of the cmbgalaxy correlation differs in teves from that in general relativity we show that this effect is detectable and hence can serve as a powerful discriminator of these two models of gravity
|
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|
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|
706.1776
|
Coherence and phase synchronization: generalization to pairs of
multivariate time series, and removal of zero-lag contributions
|
Coherence and phase synchronization between time series corresponding to
different spatial locations are usually interpreted as indicators of the
connectivity between locations. In neurophysiology, time series of electric
neuronal activity are essential for studying brain interconnectivity. Such
signals can either be invasively measured from depth electrodes, or computed
from very high time resolution, non-invasive, extracranial recordings of scalp
electric potential differences (EEG: electroencephalogram) and magnetic fields
(MEG: magnetoencephalogram) by means of a tomography such as sLORETA
(standardized low resolution brain electromagnetic tomography). There are two
problems in this case. First, in the usual situation of unknown cortical
geometry, the estimated signal at each brain location is a vector with three
components (i.e. a current density vector), which means that coherence and
phase synchronization must be generalized to pairs of multivariate time series.
Second, the inherent low spatial resolution of the EEG/MEG tomography
introduces artificially high zero-lag coherence and phase synchronization. In
this report, solutions to both problems are presented. Two additional
generalizations are briefly mentioned: (1) conditional coherence and phase
synchronization; and (2) non-stationary time-frequency analysis. Finally, a
non-parametric randomization method for connectivity significance testing is
outlined. The new connectivity measures proposed here can be applied to pairs
of univariate EEG/MEG signals, as is traditional in the published literature.
However, these calculations cannot be interpreted as connectivity, since it is
in general incorrect to associate an extracranial electrode or sensor to the
underlying cortex.
|
stat.ME stat.AP
|
coherence and phase synchronization between time series corresponding to different spatial locations are usually interpreted as indicators of the connectivity between locations in neurophysiology time series of electric neuronal activity are essential for studying brain interconnectivity such signals can either be invasively measured from depth electrodes or computed from very high time resolution noninvasive extracranial recordings of scalp electric potential differences eeg electroencephalogram and magnetic fields meg magnetoencephalogram by means of a tomography such as sloreta standardized low resolution brain electromagnetic tomography there are two problems in this case first in the usual situation of unknown cortical geometry the estimated signal at each brain location is a vector with three components ie a current density vector which means that coherence and phase synchronization must be generalized to pairs of multivariate time series second the inherent low spatial resolution of the eegmeg tomography introduces artificially high zerolag coherence and phase synchronization in this report solutions to both problems are presented two additional generalizations are briefly mentioned 1 conditional coherence and phase synchronization and 2 nonstationary timefrequency analysis finally a nonparametric randomization method for connectivity significance testing is outlined the new connectivity measures proposed here can be applied to pairs of univariate eegmeg signals as is traditional in the published literature however these calculations cannot be interpreted as connectivity since it is in general incorrect to associate an extracranial electrode or sensor to the underlying cortex
|
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|
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|
706.1777
|
"Hidden" Seyfert 2 Galaxies in the Chandra Deep Field North
|
We have compared the X-ray--to--optical flux ratios (F_x/F_opt) of absorbed
active galactic nuclei (AGNs) in the Chandra Deep Field North (CDF-N) with
those of nearby, optically classified Seyfert 2 galaxies. The comparison
provides an opportunity to explore the extent to which the local population of
absorbed AGNs can account for the properties of the distant, spectroscopically
ambiguous sources that produce the hard X-ray background. Our nearby sample
consists of 38 objects that well represent the local Seyfert 2 luminosity
function. Integrated UBVRI photometry and broadband X-ray observations are
presented. Using these data, we have simulated the F_x/F_opt ratios that local
Seyfert 2s would exhibit if they were observed in the redshift range 0.2 < z <
1.3 as part of the CDF-N. In the simulations we account for the effects of
redshift on flux measurements in fixed observed-frame bands, and the way the
luminosity function of a given population is sampled in a flux-limited survey
like the CDF-N. Overall, we find excellent agreement between our simulations
and the observed distribution of F_x/F_opt ratios for absorbed AGNs in the
CDF-N. Our analysis has thus failed to reveal any physical differences between
the local population of Seyfert 2s and CDF-N sources with similar X-ray
properties. These results support the hypothesis that the nuclear emission
lines of many distant hard X-ray galaxies are hidden in ground-based spectra
due to a combination of observational effects: signal-to-noise ratio,
wavelength coverage, and dilution by host-galaxy light.
|
astro-ph
|
we have compared the xraytooptical flux ratios f_xf_opt of absorbed active galactic nuclei agns in the chandra deep field north cdfn with those of nearby optically classified seyfert 2 galaxies the comparison provides an opportunity to explore the extent to which the local population of absorbed agns can account for the properties of the distant spectroscopically ambiguous sources that produce the hard xray background our nearby sample consists of 38 objects that well represent the local seyfert 2 luminosity function integrated ubvri photometry and broadband xray observations are presented using these data we have simulated the f_xf_opt ratios that local seyfert 2s would exhibit if they were observed in the redshift range 02 z 13 as part of the cdfn in the simulations we account for the effects of redshift on flux measurements in fixed observedframe bands and the way the luminosity function of a given population is sampled in a fluxlimited survey like the cdfn overall we find excellent agreement between our simulations and the observed distribution of f_xf_opt ratios for absorbed agns in the cdfn our analysis has thus failed to reveal any physical differences between the local population of seyfert 2s and cdfn sources with similar xray properties these results support the hypothesis that the nuclear emission lines of many distant hard xray galaxies are hidden in groundbased spectra due to a combination of observational effects signaltonoise ratio wavelength coverage and dilution by hostgalaxy light
|
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|
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|
706.1778
|
KLT relations from the Einstein-Hilbert Lagrangian
|
The Kawai-Lewellen-Tye (KLT) relations derived from string theory tell us
that perturbative gravity amplitudes are the "square" of the corresponding
amplitudes in gauge theory. Starting from the light-cone Lagrangian for pure
gravity we make these relations manifest off-shell, for three- and
four-graviton vertices, at the level of the action.
|
hep-th
|
the kawailewellentye klt relations derived from string theory tell us that perturbative gravity amplitudes are the square of the corresponding amplitudes in gauge theory starting from the lightcone lagrangian for pure gravity we make these relations manifest offshell for three and fourgraviton vertices at the level of the action
|
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|
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|
706.1779
|
Lookback time bounds from energy conditions
|
In general relativity, the energy conditions are invoked to restrict general
energy-momentum tensors on physical grounds. We show that in the standard
Friedmann-Lemaitre-Robertson-Walker (FLRW) approach to cosmological modeling,
where the energy and matter components of the cosmic fluid are unknown, the
energy conditions provide model-independent bounds on the behavior of the
lookback time of cosmic sources as a function of the redshift for any value of
the spatial curvature. We also confront such bounds with a lookback time sample
which is built from the age estimates of 32 galaxies lying in the interval
$0.11 \lesssim z \lesssim 1.84$ and by assuming the total expanding age of the
Universe to be $13.7 \pm 0.2$ Gyr, as obtained from current cosmic microwave
background experiments. In agreement with previous results, we show that all
energy conditions seem to have been violated at some point of the recent past
of cosmic evolution.
|
astro-ph gr-qc hep-th
|
in general relativity the energy conditions are invoked to restrict general energymomentum tensors on physical grounds we show that in the standard friedmannlemaitrerobertsonwalker flrw approach to cosmological modeling where the energy and matter components of the cosmic fluid are unknown the energy conditions provide modelindependent bounds on the behavior of the lookback time of cosmic sources as a function of the redshift for any value of the spatial curvature we also confront such bounds with a lookback time sample which is built from the age estimates of 32 galaxies lying in the interval 011 lesssim z lesssim 184 and by assuming the total expanding age of the universe to be 137 pm 02 gyr as obtained from current cosmic microwave background experiments in agreement with previous results we show that all energy conditions seem to have been violated at some point of the recent past of cosmic evolution
|
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|
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|
706.178
|
Le travail collaboratif dans le cadre d'un projet architectural
|
The analysis of the practices and the tendencies of the users at the time of
the search for information on Internet makes it possible to highlight several
points. The search for information becomes powerful after knowledge of the
typology of the various systems of research. This typology supports the
adoption of a methodology of research which one can characterize by pull
systems, intelligent agents, etc. In addition, the importance of the structure
of the electronic document, correctly elaborated in advance, will support a
higher relevance ratio to find information. In our article, the problems turn
around the study of the behavior of the users in situation of search for
information, as well as the constitution of a pole of documentary resources
within a framework of an architectural project. It is noted that the evolution
of the documentary resources is related to information technologies.
|
cs.HC
|
the analysis of the practices and the tendencies of the users at the time of the search for information on internet makes it possible to highlight several points the search for information becomes powerful after knowledge of the typology of the various systems of research this typology supports the adoption of a methodology of research which one can characterize by pull systems intelligent agents etc in addition the importance of the structure of the electronic document correctly elaborated in advance will support a higher relevance ratio to find information in our article the problems turn around the study of the behavior of the users in situation of search for information as well as the constitution of a pole of documentary resources within a framework of an architectural project it is noted that the evolution of the documentary resources is related to information technologies
|
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|
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|
706.1781
|
Superfluid and Pseudo-Goldstone Modes in Three Flavor Crystalline Color
Superconductivity
|
We study the bosonic excitations in the favorite cubic three flavor
crystalline LOFF phases of QCD. We calculate in the Ginzburg-Landau
approximation the masses of the eight pseudo Nambu-Goldstone Bosons (NGB)
present in the low energy theory. We also compute the decay constants of the
massless NGB Goldstones associated to superfluidity as well as those of the
eight pseudo NGB. Differently from the corresponding situation in the
Color-Flavor-Locking phase, we find that meson condensation phases are not
expected in the present scenario.
|
hep-ph
|
we study the bosonic excitations in the favorite cubic three flavor crystalline loff phases of qcd we calculate in the ginzburglandau approximation the masses of the eight pseudo nambugoldstone bosons ngb present in the low energy theory we also compute the decay constants of the massless ngb goldstones associated to superfluidity as well as those of the eight pseudo ngb differently from the corresponding situation in the colorflavorlocking phase we find that meson condensation phases are not expected in the present scenario
|
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|
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|
706.1782
|
A Constant Spectral Index for Sagittarius A* During Infrared/X-ray
Intensity Variations
|
We report the first time-series of broadband infrared (IR) color measurements
of Sgr A*, the variable emission source associated with the supermassive black
hole at the Galactic Center. Using the laser and natural guide star AO systems
on the Keck II telescope, we imaged Sgr A* in multiple near-infrared broadband
filters with a typical cycle time of ~3 min during 4 observing runs
(2005-2006), two of which were simultaneous with Chandra X-ray measurements. In
spite of the large range of dereddened flux densities for Sgr A* (2-30 mJy),
all of our near-IR measurements are consistent with a constant spectral index
of alpha = -0.6+-0.2. Furthermore, this value is consistent with the spectral
indices observed at X-ray wavelengths during nearly all outbursts; which is
consistent with the synchrotron self-Compton model for the production of the
X-ray emission. During the coordinated observations, one IR outburst occurs <36
min after a possibly associated X-ray outburst, while several similar IR
outbursts show no elevated X-ray emission. A variable X-ray to IR ratio and
constant infrared spectral index challenge the notion that the IR and X-ray
emission are connected to the same electrons. We, therefore, posit that the
population of electrons responsible for both the IR and X-ray emission are
generated by an acceleration mechanism that leaves the bulk of the electron
energy distribution responsible for the IR emission unchanged, but has a
variable high-energy cutoff. Occasionally a tail of electrons >1 GeV is
generated, and it is this high-energy tail that gives rise to the X-ray
outbursts. One possible explanation for this type of variation is from the
turbulence induced by a magnetorotational instability, in which the outer scale
length of the turbulence varies and changes the high-energy cutoff.
|
astro-ph
|
we report the first timeseries of broadband infrared ir color measurements of sgr a the variable emission source associated with the supermassive black hole at the galactic center using the laser and natural guide star ao systems on the keck ii telescope we imaged sgr a in multiple nearinfrared broadband filters with a typical cycle time of 3 min during 4 observing runs 20052006 two of which were simultaneous with chandra xray measurements in spite of the large range of dereddened flux densities for sgr a 230 mjy all of our nearir measurements are consistent with a constant spectral index of alpha 0602 furthermore this value is consistent with the spectral indices observed at xray wavelengths during nearly all outbursts which is consistent with the synchrotron selfcompton model for the production of the xray emission during the coordinated observations one ir outburst occurs 36 min after a possibly associated xray outburst while several similar ir outbursts show no elevated xray emission a variable xray to ir ratio and constant infrared spectral index challenge the notion that the ir and xray emission are connected to the same electrons we therefore posit that the population of electrons responsible for both the ir and xray emission are generated by an acceleration mechanism that leaves the bulk of the electron energy distribution responsible for the ir emission unchanged but has a variable highenergy cutoff occasionally a tail of electrons 1 gev is generated and it is this highenergy tail that gives rise to the xray outbursts one possible explanation for this type of variation is from the turbulence induced by a magnetorotational instability in which the outer scale length of the turbulence varies and changes the highenergy cutoff
|
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|
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|
706.1783
|
Scaling and Enhanced Symmetry at the Quantum Critical Point of the
Sub-Ohmic Bose-Fermi Kondo Model
|
We consider the finite temperature scaling properties of a Kondo-destroying
quantum critical point in the Ising-anisotropic Bose-Fermi Kondo model (BFKM).
A cluster-updating Monte Carlo approach is used, in order to reliably access a
wide temperature range. The scaling function for the two-point spin correlator
is found to have the form dictated by a boundary conformal field theory, even
though the underlying Hamiltonian lacks conformal invariance. Similar
conclusions are reached for all multi-point correlators of the spin-isotropic
BFKM in a dynamical large-N limit. Our results suggest that the quantum
critical local properties of the sub-ohmic BFKM are those of an underlying
boundary conformal field theory.
|
cond-mat.str-el
|
we consider the finite temperature scaling properties of a kondodestroying quantum critical point in the isinganisotropic bosefermi kondo model bfkm a clusterupdating monte carlo approach is used in order to reliably access a wide temperature range the scaling function for the twopoint spin correlator is found to have the form dictated by a boundary conformal field theory even though the underlying hamiltonian lacks conformal invariance similar conclusions are reached for all multipoint correlators of the spinisotropic bfkm in a dynamical largen limit our results suggest that the quantum critical local properties of the subohmic bfkm are those of an underlying boundary conformal field theory
|
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|
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|
706.1784
|
Surfaces with K^2<3\chi and finite fundamental group
|
In this paper we continue the study of algebraic fundamentale group of
minimal surfaces of general type S satisfying K_S^2<3\chi(S). We show that, if
K_S^2= 3\chi(S)-1 and the algebraic fundamental group of S has order 8, then S
is a Campedelli surface.
In view of the results of math.AG/0512483 and math.AG/0605733, this implies
that the fundamental group of a surface with K^2<3\chi that has no irregular
etale cover has order at most 9, and if it has order 8 or 9, then S is a
Campedelli surface.
To obtain this result we establish some classification results for minimal
surfaces of general type such that K^2=3p_g-5 and such that the canonical map
is a birational morphism. We also study rational surfaces with a Z_2^3-action.
|
math.AG
|
in this paper we continue the study of algebraic fundamentale group of minimal surfaces of general type s satisfying k_s23chis we show that if k_s2 3chis1 and the algebraic fundamental group of s has order 8 then s is a campedelli surface in view of the results of mathag0512483 and mathag0605733 this implies that the fundamental group of a surface with k23chi that has no irregular etale cover has order at most 9 and if it has order 8 or 9 then s is a campedelli surface to obtain this result we establish some classification results for minimal surfaces of general type such that k23p_g5 and such that the canonical map is a birational morphism we also study rational surfaces with a z_23action
|
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|
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|
706.1785
|
Maximum stabilizer dimension for nonproduct states
|
Composite quantum states can be classified by how they behave under local
unitary transformations. Each quantum state has a stabilizer subgroup and a
corresponding Lie algebra, the structure of which is a local unitary invariant.
In this paper, we study the structure of the stabilizer subalgebra for n-qubit
pure states, and find its maximum dimension to be n-1 for nonproduct states of
three qubits and higher. The n-qubit Greenberger-Horne-Zeilinger state has a
stabilizer subalgebra that achieves the maximum possible dimension for pure
nonproduct states. The converse, however, is not true: we show examples of pure
4-qubit states that achieve the maximum nonproduct stabilizer dimension, but
have stabilizer subalgebra structures different from that of the n-qubit GHZ
state.
|
quant-ph
|
composite quantum states can be classified by how they behave under local unitary transformations each quantum state has a stabilizer subgroup and a corresponding lie algebra the structure of which is a local unitary invariant in this paper we study the structure of the stabilizer subalgebra for nqubit pure states and find its maximum dimension to be n1 for nonproduct states of three qubits and higher the nqubit greenbergerhornezeilinger state has a stabilizer subalgebra that achieves the maximum possible dimension for pure nonproduct states the converse however is not true we show examples of pure 4qubit states that achieve the maximum nonproduct stabilizer dimension but have stabilizer subalgebra structures different from that of the nqubit ghz state
|
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|
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|
706.1786
|
Singular Fermi Surfaces I. General Power Counting and Higher Dimensional
Cases
|
We prove regularity properties of the self-energy, to all orders in
perturbation theory, for systems with singular Fermi surfaces which contain Van
Hove points where the gradient of the dispersion relation vanishes. In this
paper, we show for spatial dimensions $d \ge 3$ that despite the Van Hove
singularity, the overlapping loop bounds we proved together with E. Trubowitz
for regular non--nested Fermi surfaces [J. Stat. Phys. 84 (1996) 1209] still
hold, provided that the Fermi surface satisfies a no-nesting condition. This
implies that for a fixed interacting Fermi surface, the self-energy is a
continuously differentiable function of frequency and momentum, so that the
quasiparticle weight and the Fermi velocity remain close to their values in the
noninteracting system to all orders in perturbation theory. In a companion
paper, we treat the more singular two-dimensional case.
|
math-ph cond-mat.str-el math.MP
|
we prove regularity properties of the selfenergy to all orders in perturbation theory for systems with singular fermi surfaces which contain van hove points where the gradient of the dispersion relation vanishes in this paper we show for spatial dimensions d ge 3 that despite the van hove singularity the overlapping loop bounds we proved together with e trubowitz for regular nonnested fermi surfaces j stat phys 84 1996 1209 still hold provided that the fermi surface satisfies a nonesting condition this implies that for a fixed interacting fermi surface the selfenergy is a continuously differentiable function of frequency and momentum so that the quasiparticle weight and the fermi velocity remain close to their values in the noninteracting system to all orders in perturbation theory in a companion paper we treat the more singular twodimensional case
|
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|
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|
706.1787
|
The Search for the Missing Baryons at Low Redshift
|
At low redshift, only about one-tenth of the known baryons lie in galaxies or
the hot gas seen in galaxy clusters and groups. Models posit that these
"missing baryons" are in gaseous form in overdense filaments that connect the
much denser virialized groups and clusters. About 30% are cool (<1E5 K) and are
detected in Ly alpha absorption studies, but about half is predicted to lie in
the 1E5-1E7 K regime. Gas is detected in the 2-5E5 K range through OVI
absorption studies (7% of the baryons) and possibly near 1E5 K from broad Ly
absorption (20% of the baryons). Hotter gas (0.5-2E6 K) is detected at zero
redshift by OVII and OVIII K X-ray absorption, and the OVII line strengths seem
to correlate with the Galactic soft X-ray background, so it is probably
produced by Galactic Halo gas, rather than a Local Group medium. There are no
compelling detections of the intergalactic hot gas (0.5-10E6 K) either in
absorption or emission and these upper limits are consistent with theoretical
models. Claimed X-ray absorption lines are not confirmed, while most of the
claims of soft emission are attributable to artifacts of background subtraction
and field-flattening. The missing baryons should become detectable with
moderate improvements in instrumental sensitivity.
|
astro-ph
|
at low redshift only about onetenth of the known baryons lie in galaxies or the hot gas seen in galaxy clusters and groups models posit that these missing baryons are in gaseous form in overdense filaments that connect the much denser virialized groups and clusters about 30 are cool 1e5 k and are detected in ly alpha absorption studies but about half is predicted to lie in the 1e51e7 k regime gas is detected in the 25e5 k range through ovi absorption studies 7 of the baryons and possibly near 1e5 k from broad ly absorption 20 of the baryons hotter gas 052e6 k is detected at zero redshift by ovii and oviii k xray absorption and the ovii line strengths seem to correlate with the galactic soft xray background so it is probably produced by galactic halo gas rather than a local group medium there are no compelling detections of the intergalactic hot gas 0510e6 k either in absorption or emission and these upper limits are consistent with theoretical models claimed xray absorption lines are not confirmed while most of the claims of soft emission are attributable to artifacts of background subtraction and fieldflattening the missing baryons should become detectable with moderate improvements in instrumental sensitivity
|
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|
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|
706.1788
|
Singular Fermi Surfaces II. The Two--Dimensional Case
|
We consider many--fermion systems with singular Fermi surfaces, which contain
Van Hove points where the gradient of the band function $k \mapsto e(k)$
vanishes. In a previous paper, we have treated the case of spatial dimension $d
\ge 3$. In this paper, we focus on the more singular case $d=2$ and establish
properties of the fermionic self--energy to all orders in perturbation theory.
We show that there is an asymmetry between the spatial and frequency
derivatives of the self--energy. The derivative with respect to the Matsubara
frequency diverges at the Van Hove points, but, surprisingly, the self--energy
is $C^1$ in the spatial momentum to all orders in perturbation theory, provided
the Fermi surface is curved away from the Van Hove points. In a prototypical
example, the second spatial derivative behaves similarly to the first frequency
derivative. We discuss the physical significance of these findings.
|
math-ph cond-mat.str-el math.MP
|
we consider manyfermion systems with singular fermi surfaces which contain van hove points where the gradient of the band function k mapsto ek vanishes in a previous paper we have treated the case of spatial dimension d ge 3 in this paper we focus on the more singular case d2 and establish properties of the fermionic selfenergy to all orders in perturbation theory we show that there is an asymmetry between the spatial and frequency derivatives of the selfenergy the derivative with respect to the matsubara frequency diverges at the van hove points but surprisingly the selfenergy is c1 in the spatial momentum to all orders in perturbation theory provided the fermi surface is curved away from the van hove points in a prototypical example the second spatial derivative behaves similarly to the first frequency derivative we discuss the physical significance of these findings
|
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|
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|
706.1789
|
B production at the LHC / QCD aspects
|
The LHC provides new opportunities to improve our understanding of the b
quark using high statistics data samples and the 14 TeV center-of-mass energy.
The prospects to measure the cross section for inclusive b production in events
containing jets and at least one muon are presented. Studies of detector
systematic effects and theoretical uncertainties are included. QCD aspects of
the beauty production are discussed.
|
hep-ex
|
the lhc provides new opportunities to improve our understanding of the b quark using high statistics data samples and the 14 tev centerofmass energy the prospects to measure the cross section for inclusive b production in events containing jets and at least one muon are presented studies of detector systematic effects and theoretical uncertainties are included qcd aspects of the beauty production are discussed
|
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|
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|
706.179
|
How to measure efficiency?
|
In the context of applied game theory in networking environments, a number of
concepts have been proposed to measure both efficiency and optimality of
resource allocations, the most famous certainly being the price of anarchy and
the Jain index. Yet, very few have tried to question these measures and compare
them one to another, in a general framework, which is the aim of the present
article.
|
cs.GT
|
in the context of applied game theory in networking environments a number of concepts have been proposed to measure both efficiency and optimality of resource allocations the most famous certainly being the price of anarchy and the jain index yet very few have tried to question these measures and compare them one to another in a general framework which is the aim of the present article
|
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|
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|
706.1791
|
X-ray Luminosity Functions of Normal Galaxies in the GOODS
|
We present soft (0.5-2 keV) X-ray luminosity functions (XLFs) in the Great
Observatories Origins Deep Survey (GOODS) fields, derived for galaxies at
z~0.25 and 0.75. SED fitting was used to estimate photometric redshifts and
separate galaxy types, resulting in a sample of 40 early-type galaxies and 46
late-type galaxies. We estimate k-corrections for both the X-ray/optical and
X-ray/NIR flux ratios, which facilitates the separation of AGN from the
normal/starburst galaxies. We fit the XLFs with a power-law model using both
traditional and Markov-Chain Monte Carlo (MCMC) procedures. The XLFs differ
between z<0.5 and z>0.5, at >99% significance levels for early-type, late-type
and all (early and late-type) galaxies.We also fit Schechter and log-normal
models to the XLFs, fitting the low and high redshift XLFs for a given sample
simultaneously assuming only pure luminosity evolution. In the case of
log-normal fits, the results of MCMC fitting of the local FIR luminosity
function were used as priors for the faint and bright-end slopes (similar to
``fixing'' these parameters at the FIR values except here the FIR uncertainty
is included). The best-fit values of the change in log L* with redshift were
dlogL* = 0.23 +/- 0.16 dex (for early-type galaxies) and 0.34 +/- 0.12 dex (for
late-type galaxies), corresponding to (1+z)^1.6 and (1+z)^2.3. These results
were insensitive to whether the Schechter or log-normal function was adopted.
|
astro-ph
|
we present soft 052 kev xray luminosity functions xlfs in the great observatories origins deep survey goods fields derived for galaxies at z025 and 075 sed fitting was used to estimate photometric redshifts and separate galaxy types resulting in a sample of 40 earlytype galaxies and 46 latetype galaxies we estimate kcorrections for both the xrayoptical and xraynir flux ratios which facilitates the separation of agn from the normalstarburst galaxies we fit the xlfs with a powerlaw model using both traditional and markovchain monte carlo mcmc procedures the xlfs differ between z05 and z05 at 99 significance levels for earlytype latetype and all early and latetype galaxieswe also fit schechter and lognormal models to the xlfs fitting the low and high redshift xlfs for a given sample simultaneously assuming only pure luminosity evolution in the case of lognormal fits the results of mcmc fitting of the local fir luminosity function were used as priors for the faint and brightend slopes similar to fixing these parameters at the fir values except here the fir uncertainty is included the bestfit values of the change in log l with redshift were dlogl 023 016 dex for earlytype galaxies and 034 012 dex for latetype galaxies corresponding to 1z16 and 1z23 these results were insensitive to whether the schechter or lognormal function was adopted
|
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|
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|
706.1792
|
On existence of log minimal models
|
In this paper, we prove that the log minimal model program in dimension $d-1$
implies the existence of log minimal models for effective lc pairs (eg of
nonnegative Kodaira dimension) in dimension $d$. In fact, we prove that the
same conclusion follows from a weaker assumption, namely, the log minimal model
program with scaling in dimension $d-1$. This enables us to prove that
effective lc pairs in dimension five have log minimal models. We also give new
proofs of the existence of log minimal models for effective lc pairs in
dimension four and the Shokurov reduction theorem. Other applications appear in
a paper of Birkar-Paun.
|
math.AG
|
in this paper we prove that the log minimal model program in dimension d1 implies the existence of log minimal models for effective lc pairs eg of nonnegative kodaira dimension in dimension d in fact we prove that the same conclusion follows from a weaker assumption namely the log minimal model program with scaling in dimension d1 this enables us to prove that effective lc pairs in dimension five have log minimal models we also give new proofs of the existence of log minimal models for effective lc pairs in dimension four and the shokurov reduction theorem other applications appear in a paper of birkarpaun
|
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|
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|
706.1793
|
The beta function of gauge theories at two loops in differential
renormalization
|
This PhD thesis is devoted to show that differential renormalization is a
simple and useful renormalization method that we can use when dealing with
gauge theories. In this work, it is shown how the one-loop results of
Constraint Differential Renormalization can be fruitfully applied when
renormalizing two-loop amplitudes. As an example of this procedure, the
two-loop beta functions of various relevant gauge theories are obtained (QED,
SuperQED, Yang-Mills and N=1 SuperYM) without making use of the Ward
identities, which are mandatory in the standard differential renormalization
procedure. Also, we study how to deal with expressions that have IR and UV
divergences, showing that both are renormalized with independent scales. This
result allow us to give new insight on the origin of the higher order
corrections to the beta function of the N=1 SuperYM theory, as in this case we
have both divergences due to the form of the gauge propagator. This is an
advantage over usual dimensional regularization methods, where both divergences
become mixed.
|
hep-th
|
this phd thesis is devoted to show that differential renormalization is a simple and useful renormalization method that we can use when dealing with gauge theories in this work it is shown how the oneloop results of constraint differential renormalization can be fruitfully applied when renormalizing twoloop amplitudes as an example of this procedure the twoloop beta functions of various relevant gauge theories are obtained qed superqed yangmills and n1 superym without making use of the ward identities which are mandatory in the standard differential renormalization procedure also we study how to deal with expressions that have ir and uv divergences showing that both are renormalized with independent scales this result allow us to give new insight on the origin of the higher order corrections to the beta function of the n1 superym theory as in this case we have both divergences due to the form of the gauge propagator this is an advantage over usual dimensional regularization methods where both divergences become mixed
|
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|
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|
706.1794
|
Birational geometry
|
This article contains the notes of a graduate course on birational geometry
focusing on the minimal model program. Topics covered include singularities,
vanishing, nonvanishing, cone and contraction, base point freeness, finite
generation, flips, termination, minimal models and Mori fibre spaces.
|
math.AG
|
this article contains the notes of a graduate course on birational geometry focusing on the minimal model program topics covered include singularities vanishing nonvanishing cone and contraction base point freeness finite generation flips termination minimal models and mori fibre spaces
|
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|
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|
706.1795
|
Inverting geometric transitions: explicit Calabi-Yau metrics for the
Maldacena-Nunez solutions
|
Explicit Calabi-Yau metrics are derived that are argued to map to the
Maldacena-Nu\~{n}ez AdS solutions of M-theory and IIB under geometric
transitions. In each case the metrics are singular where a H^2 K\"{a}hler
two-cycle degenerates but are otherwise smooth. They are derived as the most
general Calabi-Yau solutions of an ansatz for the supergravity description of
branes wrapped on K\"{a}hler two-cycles. The ansatz is inspired by re-writing
the AdS solutions, and the structure defined by half their Killing spinors, in
this form. The world-volume theories of fractional branes wrapped at the
singularities of these metrics are proposed as the duals of the AdS solutions.
The existence of supergravity solutions interpolating between the $AdS$ and
Calabi-Yau metrics is conjectured and their boundary conditions briefly
discussed.
|
hep-th
|
explicit calabiyau metrics are derived that are argued to map to the maldacenanunez ads solutions of mtheory and iib under geometric transitions in each case the metrics are singular where a h2 kahler twocycle degenerates but are otherwise smooth they are derived as the most general calabiyau solutions of an ansatz for the supergravity description of branes wrapped on kahler twocycles the ansatz is inspired by rewriting the ads solutions and the structure defined by half their killing spinors in this form the worldvolume theories of fractional branes wrapped at the singularities of these metrics are proposed as the duals of the ads solutions the existence of supergravity solutions interpolating between the ads and calabiyau metrics is conjectured and their boundary conditions briefly discussed
|
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|
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|
706.1796
|
Project to install roman pot detectors at 220 m in ATLAS
|
We give a short description of the project to install roman pot detectors at
220 m from the interaction point in ATLAS. This project is dedicated to hard
diffractive measurements at high luminosity.
|
physics.ins-det hep-ex
|
we give a short description of the project to install roman pot detectors at 220 m from the interaction point in atlas this project is dedicated to hard diffractive measurements at high luminosity
|
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|
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|
706.1797
|
Soluble Models of Strongly Interacting Ultracold Gas Mixtures in Tight
Waveguides
|
A generalized Fermi-Bose mapping method is used to determine the exact ground
states of several models of mixtures of strongly interacting ultracold gases in
tight waveguides, which are generalizations of the Tonks-Girardeau (TG) gas (1D
Bose gas with point hard cores) and fermionic Tonks-Girardeau (FTG) gas (1D
spin-aligned Fermi gas with infinitely strong zero-range attractions). We
detail the case of a Bose-Fermi mixture with TG boson-boson (BB) and
boson-fermion (BF) interactions. Exact results are given for density profiles
in a harmonic trap, single-particle density matrices, momentum distributions,
and density-density correlations. Since the ground state is highly degenerate,
we analyze the splitting of the ground manifold for large but finite BB and BF
repulsions.
|
cond-mat.other
|
a generalized fermibose mapping method is used to determine the exact ground states of several models of mixtures of strongly interacting ultracold gases in tight waveguides which are generalizations of the tonksgirardeau tg gas 1d bose gas with point hard cores and fermionic tonksgirardeau ftg gas 1d spinaligned fermi gas with infinitely strong zerorange attractions we detail the case of a bosefermi mixture with tg bosonboson bb and bosonfermion bf interactions exact results are given for density profiles in a harmonic trap singleparticle density matrices momentum distributions and densitydensity correlations since the ground state is highly degenerate we analyze the splitting of the ground manifold for large but finite bb and bf repulsions
|
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|
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|
706.1798
|
New QCD fits to HERA data and search for exclusive events at the
Tevatron
|
We describe new QCD fits to diffractive proton structure functions measured
at HERA, and we use these parton densities to predict the shape of the dijet
mass fraction at the Tevatron and look for the existence of exclusive events in
the dijet channel.
|
hep-ph
|
we describe new qcd fits to diffractive proton structure functions measured at hera and we use these parton densities to predict the shape of the dijet mass fraction at the tevatron and look for the existence of exclusive events in the dijet channel
|
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|
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|
706.1799
|
BFKL NLL phenomenology of forward jets at HERA and Mueller Navelet jets
at the Tevatron and the LHC
|
We perform a BFKL-NLL analysis of forward jet production at HERA which leads
to a good description of data over the full kinematical domain. We also predict
the azimuthal angle dependence of Mueller-Navelet jet production at the
Tevatron and the LHC using the BFKL NLL formalism.
|
hep-ph
|
we perform a bfklnll analysis of forward jet production at hera which leads to a good description of data over the full kinematical domain we also predict the azimuthal angle dependence of muellernavelet jet production at the tevatron and the lhc using the bfkl nll formalism
|
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|
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|
706.18
|
Necessary Conditions for Schur-Positivity
|
In recent years, there has been considerable interest in showing that certain
conditions on skew shapes A and B are sufficient for the difference s_A - s_B
of their skew Schur functions to be Schur-positive. We determine necessary
conditions for the difference to be Schur-positive. Our conditions are
motivated by those of Reiner, Shaw and van Willigenburg that are necessary for
s_A = s_B, and we deduce a strengthening of their result as a special case.
|
math.CO
|
in recent years there has been considerable interest in showing that certain conditions on skew shapes a and b are sufficient for the difference s_a s_b of their skew schur functions to be schurpositive we determine necessary conditions for the difference to be schurpositive our conditions are motivated by those of reiner shaw and van willigenburg that are necessary for s_a s_b and we deduce a strengthening of their result as a special case
|
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|
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|
706.1801
|
Mass-to-light Ratio of Ly-alpha Emitters: Implications of Ly-alpha
Surveys at Redshifts z=5.7, 6.5, 7, and 8.8
|
Using a simple method to interpret the luminosity function of Ly-alpha
emitters, we explore properties of Ly-alpha emitters from 5.7 < z < 8.8 with
various assumptions about metallicity and stellar mass spectra. We constrain a
mass-to-'observed' light ratio, M_h/L_band. For narrow-band surveys, L_band is
simply related to the intrinsic Ly-alpha luminosity with a survival fraction of
Ly-alpha photons, alpha_esc. The mass-to-'bolometric light', M_h/L_bol, can
also be deduced, once the metallicity and stellar mass spectrum are given. The
inferred M_h/L_bol is more sensitive to metallicity than to the mass spectrum.
We find the following constraints on a mass-to-light ratio of Ly-alpha emitters
from 5.7 < z < 7: (M_h/L_bol)(alpha_{esc}epsilon^{1/gamma})^{-1}=21-38, 14-26,
and 9-17 for Z=0, 1/50, and 1 Z_sun, respectively, where epsilon is the 'duty
cycle' of Ly-alpha emitters, and gamma ~ 2 is a local slope of the cumulative
luminosity function. Only weak lower limits are obtained for z=8.8. Therefore,
Ly-alpha emitters are consistent with either starburst galaxies M_h/L_bol ~
0.1-1 with a smaller Ly-alpha survival fraction, alpha_{esc}epsilon^{1/gamma}
~0.01-0.05, or normal populations (M_h/L_bol ~ 10) if a good fraction of
Ly-alpha photons survived, alpha_{esc}epsilon^{1/gamma} ~ 0.5-1. We find no
evidence for the end of reionization in the luminosity functions of Ly-alpha
emitters discovered in the current Ly-alpha surveys, including recent discovery
of one Ly-alpha emitter at z=7. The data are consistent with no evolution of
intrinsic properties of Ly-alpha emitters or neutral fraction in the
intergalactic medium up to z=7. No detection of sources at z=8.8 does not yield
a significant constraint yet. We also show that the lack of detection at z=8.8
does not rule out the high-z galaxies being the origin of the excess NIRB.
|
astro-ph
|
using a simple method to interpret the luminosity function of lyalpha emitters we explore properties of lyalpha emitters from 57 z 88 with various assumptions about metallicity and stellar mass spectra we constrain a masstoobserved light ratio m_hl_band for narrowband surveys l_band is simply related to the intrinsic lyalpha luminosity with a survival fraction of lyalpha photons alpha_esc the masstobolometric light m_hl_bol can also be deduced once the metallicity and stellar mass spectrum are given the inferred m_hl_bol is more sensitive to metallicity than to the mass spectrum we find the following constraints on a masstolight ratio of lyalpha emitters from 57 z 7 m_hl_bolalpha_escepsilon1gamma12138 1426 and 917 for z0 150 and 1 z_sun respectively where epsilon is the duty cycle of lyalpha emitters and gamma 2 is a local slope of the cumulative luminosity function only weak lower limits are obtained for z88 therefore lyalpha emitters are consistent with either starburst galaxies m_hl_bol 011 with a smaller lyalpha survival fraction alpha_escepsilon1gamma 001005 or normal populations m_hl_bol 10 if a good fraction of lyalpha photons survived alpha_escepsilon1gamma 051 we find no evidence for the end of reionization in the luminosity functions of lyalpha emitters discovered in the current lyalpha surveys including recent discovery of one lyalpha emitter at z7 the data are consistent with no evolution of intrinsic properties of lyalpha emitters or neutral fraction in the intergalactic medium up to z7 no detection of sources at z88 does not yield a significant constraint yet we also show that the lack of detection at z88 does not rule out the highz galaxies being the origin of the excess nirb
|
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|
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|
706.1802
|
Notes on Quantum Field Theory in Curved Spacetime: Problems Relating to
the Concept of Particles and Hamiltonian Formalism
|
The aim of these notes is to elucidate some aspects of quantum field theory
in curved spacetime, especially those relating to the notion of particles. A
selection of issues relevant to wave-particle duality is given. The case of a
generic curved spacetime is outlined. A Hamiltonian formulation of quantum
field theory in curved spacetime is elaborated for a preferred reference frame
with a separated space metric (a static spacetime and a reductive synchronous
reference frame). Applications: (1) Black hole. (2) The universe; the
cosmological redshift is obtained in the context of quantum field theory.
|
physics.gen-ph
|
the aim of these notes is to elucidate some aspects of quantum field theory in curved spacetime especially those relating to the notion of particles a selection of issues relevant to waveparticle duality is given the case of a generic curved spacetime is outlined a hamiltonian formulation of quantum field theory in curved spacetime is elaborated for a preferred reference frame with a separated space metric a static spacetime and a reductive synchronous reference frame applications 1 black hole 2 the universe the cosmological redshift is obtained in the context of quantum field theory
|
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|
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|
706.1803
|
Electronic stopping power in insulators from first principles
|
Using time-dependent density-functional theory we calculate from first
principles the rate of energy transfer from a moving proton or antiproton to
the electrons of an insulating material, LiF. The behavior of the electronic
stopping power versus projectile velocity displays an effective threshold
velocity of ~0.2 a.u. for the proton, consistent with recent experimental
observations, and also for the antiproton. The calculated proton/antiproton
stopping-power ratio is ~2.4 at velocities slightly above the threshold (v~0.4
a.u.), as compared to the experimental value of 2.1. The projectile energy loss
mechanism is observed to be stationary and extremely local.
|
cond-mat.mtrl-sci
|
using timedependent densityfunctional theory we calculate from first principles the rate of energy transfer from a moving proton or antiproton to the electrons of an insulating material lif the behavior of the electronic stopping power versus projectile velocity displays an effective threshold velocity of 02 au for the proton consistent with recent experimental observations and also for the antiproton the calculated protonantiproton stoppingpower ratio is 24 at velocities slightly above the threshold v04 au as compared to the experimental value of 21 the projectile energy loss mechanism is observed to be stationary and extremely local
|
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|
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|
706.1804
|
HD 114839 - An Am star showing both delta Scuti and gamma Dor pulsations
discovered through MOST photometry
|
Using MOST (Microvariability and Oscillations of STars) satellite guide star
photometry, we have discovered a metallic A star showing hybrid p- and g-mode
pulsations. HD 114839 was observed nearly continuously for 10 days in March,
2005. We identify frequencies in three groups: the first centered near 2
cycles/day, in the gamma Dor pulsation range, and two others near 8 and 20,
both in the delta Scuti range. This is only the fourth known such hybrid
pulsator, including another MOST discovery (Rowe et al. 2006, this issue).
|
astro-ph
|
using most microvariability and oscillations of stars satellite guide star photometry we have discovered a metallic a star showing hybrid p and gmode pulsations hd 114839 was observed nearly continuously for 10 days in march 2005 we identify frequencies in three groups the first centered near 2 cyclesday in the gamma dor pulsation range and two others near 8 and 20 both in the delta scuti range this is only the fourth known such hybrid pulsator including another most discovery rowe et al 2006 this issue
|
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|
706.1805
|
The von Neumann entropy asymptotics in multidimensional fermionic
systems
|
We study the von Neumann entropy asymptotics of pure translation-invariant
quasi-free states of d-dimensional fermionic systems. It is shown that the
entropic area law is violated by all these states: apart from the trivial
cases, the entropy of a cubic subsystem with edge length L cannot grow slower
than L^{d-1}ln L. As for the upper bound of the entropy asymptotics, the
zero-entropy-density property of these pure states is the only limit: it is
proven that arbitrary fast sub-L^d entropy growth is achievable.
|
math-ph cond-mat.stat-mech math.MP quant-ph
|
we study the von neumann entropy asymptotics of pure translationinvariant quasifree states of ddimensional fermionic systems it is shown that the entropic area law is violated by all these states apart from the trivial cases the entropy of a cubic subsystem with edge length l cannot grow slower than ld1ln l as for the upper bound of the entropy asymptotics the zeroentropydensity property of these pure states is the only limit it is proven that arbitrary fast subld entropy growth is achievable
|
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|
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|
706.1806
|
On the asymptotic behavior of Faber polynomials for domains with
piecewise analytic boundary
|
For a function g(w) analytic and univalent in {w:1<|w|<\infty} with a simple
pole at \infty and a continuous extension to {w:|w|\geq 1}, we consider the
Faber polynomials F_n(z), n=0,1,2,..., associated to g(w) via their generating
function g'(w)/(g(w)-z)=\sum_{n=0}^\infty F_n(z)w^{-(n+1)}. Assuming that g(w)
maps the unit circle T onto a piecewise analytic curve L whose exterior domain
has no outward-pointing cusps, and under an additional assumption concerning
the "Lehman expansion" of g(w) about those points of T mapped onto corners of
L, we obtain asymptotic formulas for F_n(z) that yield fine results on the
location, limiting distribution and accumulation points of the zeros of the
Faber polynomials. The asymptotic formulas are shown to hold uniformly and the
exact rate of decay of the error terms involved is provided.
|
math.CA math.CV
|
for a function gw analytic and univalent in w1winfty with a simple pole at infty and a continuous extension to wwgeq 1 we consider the faber polynomials f_nz n012 associated to gw via their generating function gwgwzsum_n0infty f_nzwn1 assuming that gw maps the unit circle t onto a piecewise analytic curve l whose exterior domain has no outwardpointing cusps and under an additional assumption concerning the lehman expansion of gw about those points of t mapped onto corners of l we obtain asymptotic formulas for f_nz that yield fine results on the location limiting distribution and accumulation points of the zeros of the faber polynomials the asymptotic formulas are shown to hold uniformly and the exact rate of decay of the error terms involved is provided
|
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|
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|
706.1807
|
Generalised knot groups distinguish the square and granny knots (with an
appendix by David Savitt)
|
Given a knot K we may construct a group G_n(K) from the fundamental group of
K by adjoining an nth root of the meridian that commutes with the corresponding
longitude. These "generalised knot groups" were introduced independently by
Wada and Kelly, and contain the fundamental group as a subgroup. The square
knot SK and the granny knot GK are a well known example of a pair of distinct
knots with isomorphic fundamental groups. We show that G_n(SK) and G_n(GK) are
non-isomorphic for all n>1. This confirms a conjecture of Lin and Nelson, and
shows that the isomorphism type of G_n(K), n>1, carries more information about
K than the isomorphism type of the fundamental group. An appendix by David
Savitt contains some results on representations of the trefoil group in
PSL(2,p) that are needed for the proof.
|
math.GT
|
given a knot k we may construct a group g_nk from the fundamental group of k by adjoining an nth root of the meridian that commutes with the corresponding longitude these generalised knot groups were introduced independently by wada and kelly and contain the fundamental group as a subgroup the square knot sk and the granny knot gk are a well known example of a pair of distinct knots with isomorphic fundamental groups we show that g_nsk and g_ngk are nonisomorphic for all n1 this confirms a conjecture of lin and nelson and shows that the isomorphism type of g_nk n1 carries more information about k than the isomorphism type of the fundamental group an appendix by david savitt contains some results on representations of the trefoil group in psl2p that are needed for the proof
|
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|
[-0.2017894486728152, 0.11280651832387761, -0.10287025164284591, 0.03898705417114838, -0.10466212903865293, -0.14478475238377256, 0.03243274024145594, 0.3386818345205219, -0.2823940523858391, -0.30040143036853467, 0.10215102157941255, -0.28309029679738484, -0.1544829051152789, 0.2065841933545559, -0.10964428019751586, -0.07785015833675306, 0.024818817808626416, 0.1524983741822583, -0.035380988288844534, -0.267441157480952, 0.348013587459338, -0.035739067153059946, 0.15582634973576043, 0.006296548584073003, 0.09730695513747771, 0.004500822720131767, -0.06876237393502813, -0.011694196666375414, -0.16285045585467361, 0.11440732079095889, 0.23545124358845068, 0.06466124894848066, 0.17354689769137568, -0.3247482341839306, -0.14908300095008437, 0.14924344631805042, 0.14518990857290354, -0.005785090419630617, -0.03406365329381026, -0.26546815509643795, 0.10845551909288086, -0.15584104781303165, -0.14772822655417692, -0.010059231516919028, 0.081755164652757, 0.030455519361838476, -0.17804000517631421, 0.029137597843281814, 0.09289053342836812, 0.12012827895414918, -0.0048660841534164416, -0.1533369330355703, -0.06037046011266257, 0.14219246944760097, -0.003125020546088023, 0.06893694037641052, 0.046939117847872316, -0.09887174940767955, -0.1547569003817973, 0.41576160885282415, -0.043439125100610286, -0.14148218804317067, 0.15020501863823008, -0.1436259621239976, -0.20228468002959973, 0.15896237089729576, 0.007244810795606072, 0.09852726018028472, -0.03728224608939447, 0.12966084457784474, -0.20463189217192468, 0.12224303304005775, 0.1105520999260636, -0.05282370012197921, 0.13335460357006584, 0.04490424763522486, 0.06986490339944278, 0.14566839237718274, -0.0036081958218102356, -0.0008751497979261982, -0.35619588454823886, -0.22617886013893493, -0.1425130672009189, 0.10384210911509928, -0.11428214594962444, -0.09465217676861629, 0.40036840906450105, 0.0455012525294546, 0.15254820825240173, 0.09299094289708049, 0.17497877428593087, 0.0340916807268079, 0.07468327612324215, 0.12403396515648311, 0.11712571491818326, 0.22181766693577615, -0.07737740409237319, -0.1486989941722505, -0.031091955956071615, 0.21218300327735104]
|
706.1808
|
Simultaneous packing and covering in the two-dimensional Euclidean plane
II
|
This paper determines the optimal upper bound for the simultaneous packing
and covering constants of the two-dimensional centrally symmetric convex
domains. It solved a problem opening for more than thirty years.
|
math.MG math.NT
|
this paper determines the optimal upper bound for the simultaneous packing and covering constants of the twodimensional centrally symmetric convex domains it solved a problem opening for more than thirty years
|
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|
[-0.13737493811640888, 0.11198493075226584, -0.009143529805324731, 0.06209559965082594, -0.08098677595356299, -0.15581625362016982, 0.09369734458760509, 0.354044642089115, -0.2647981189431683, -0.2802363611277073, 0.18353467026064474, -0.22616920151537465, -0.10683583170776406, 0.2637979222401496, -0.030885371980407545, 0.0915739031869077, 0.030870630856483214, -0.02914875499423473, -0.12952789258692535, -0.2917997882731499, 0.2879284369128366, -0.0229366542471032, 0.2282406619239238, 0.10003277841174314, 0.08493116741339045, 0.0641723642906835, -0.003960592071375539, 0.04957573845862381, -0.23255314016264053, 0.24809574813116342, 0.2611981090834184, 0.12524501498668425, 0.2745779419257756, -0.3796802313337403, -0.16310101987854128, 0.13353591850928723, 0.14699049384122895, 0.05574779808821698, -0.02912125382957334, -0.1942285821592856, 0.07639962912447029, -0.11665089776919733, -0.15963055773247634, 0.036814954548683616, 0.10300341699152224, -0.08566083867223032, -0.2746104003200608, 0.07949313932969686, 0.05972166375854173, 0.03015411599265081, -0.13166745741581243, -0.15051408301317884, 0.08434353600586614, 0.07547628589635415, -0.007407498996584646, 0.052072769466547236, 0.07369188856213324, -0.13133366991044773, -0.10070362074240562, 0.40684870588442973, 0.018085769653196387, -0.18177792852774502, 0.12037371681822885, -0.151107432320714, -0.1358567746055703, 0.21725987775191183, 0.2131468807797759, 0.2211438357124045, -0.14761735826370218, 0.10612906635581185, -0.19650790242538338, 0.15278243683203455, 0.17536469401731605, 0.01492995982088389, 0.15441201194640128, 0.1575329443740268, 0.2693300318093069, 0.211030010374323, 0.007113493047654629, -0.15434675531521921, -0.19205185110049863, -0.14626684859432582, -0.1730612849275912, 0.04232058746199454, -0.11599124140329584, -0.1376603170027656, 0.3959142051396831, -0.002262785129489437, 0.14212583020449646, 0.10670439311492842, 0.24866763135838893, 0.11073299725690196, 0.0422659708908008, 0.1587665026797162, 0.2613438620202003, 0.12707450834193057, 0.06853085170469937, -0.15948886712712626, 0.042784477719255996, 0.07235512302647676]
|
706.1809
|
The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. IV. Lupus
Observed with MIPS
|
We present maps of 7.78 square degrees of the Lupus molecular cloud complex
at 24, 70, and $160\:\mu$m. They were made with the Spitzer Space Telescope's
Multiband Imaging Photometer for Spitzer (MIPS) instrument as part of the
Spitzer Legacy Program, ``From Molecular Cores to Planet-Forming Disks'' (c2d).
The maps cover three separate regions in Lupus, denoted I, III, and IV. We
discuss the c2d pipeline and how our data processing differs from it. We
compare source counts in the three regions with two other data sets and
predicted star counts from the Wainscoat model. This comparison shows the
contribution from background galaxies in Lupus I. We also create two color
magnitude diagrams using the 2MASS and MIPS data. From these results, we can
identify background galaxies and distinguish them from probable young stellar
objects. The sources in our catalogs are classified based on their spectral
energy distribution (SED) from 2MASS and Spitzer wavelengths to create a sample
of young stellar object candidates. From 2MASS data, we create extinction maps
for each region and note a strong corresponence between the extinction and the
$160\:\mu$m emission. The masses we derived in each Lupus cloud from our
extinction maps are compared to masses estimated from $^{13}$CO and C$^{18}$O
and found to be similar to our extinction masses in some regions, but
significantly different in others. Finally, based on our color-magnitude
diagrams, we selected 12 of our reddest candidate young stellar objects for
individual discussion. Five of the 12 appear to be newly-discovered YSOs.
|
astro-ph
|
we present maps of 778 square degrees of the lupus molecular cloud complex at 24 70 and 160mum they were made with the spitzer space telescopes multiband imaging photometer for spitzer mips instrument as part of the spitzer legacy program from molecular cores to planetforming disks c2d the maps cover three separate regions in lupus denoted i iii and iv we discuss the c2d pipeline and how our data processing differs from it we compare source counts in the three regions with two other data sets and predicted star counts from the wainscoat model this comparison shows the contribution from background galaxies in lupus i we also create two color magnitude diagrams using the 2mass and mips data from these results we can identify background galaxies and distinguish them from probable young stellar objects the sources in our catalogs are classified based on their spectral energy distribution sed from 2mass and spitzer wavelengths to create a sample of young stellar object candidates from 2mass data we create extinction maps for each region and note a strong corresponence between the extinction and the 160mum emission the masses we derived in each lupus cloud from our extinction maps are compared to masses estimated from 13co and c18o and found to be similar to our extinction masses in some regions but significantly different in others finally based on our colormagnitude diagrams we selected 12 of our reddest candidate young stellar objects for individual discussion five of the 12 appear to be newlydiscovered ysos
|
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|
[0.0036963350261606637, 0.05825471620060383, -0.08055641878050782, 0.0992907403138346, -0.0821381448279886, -0.0527777808883618, 0.08769067423699814, 0.4758150880675643, -0.18841771107737817, -0.37237582098685146, 0.07147876568553564, -0.3285076643092438, -0.05751566816170159, 0.18329408172341513, -0.06557565433761356, -0.05160731726303516, 0.05753508210839373, -0.1402541258590176, 0.002398199403204114, -0.2867545017891849, 0.32694916942742686, 0.0020746995024608387, 0.14904971242856024, -0.07632590586511087, 0.03696530235409286, -0.13258271749228082, -0.1827786069141791, -0.03073491119873999, -0.1753065334520333, 0.09539772566190109, 0.2453554138088704, 0.1591415702094955, 0.12754749613363417, -0.3130538582184477, -0.16584626240974984, 0.07105742184249984, 0.17542671552720066, 0.039990852185104404, -0.00852983292556488, -0.32920512621996983, 0.053398490028602315, -0.13718318595408252, -0.12263565652462985, 0.04122664742622404, 0.040338898308560134, 0.05066333958811517, -0.212150476563106, 0.06545663135412108, -0.054922652274516655, 0.13882580109132123, -0.16892445061051647, -0.19507690586033277, -0.11097940801072025, 0.14325485941991511, -0.05982978886787614, 0.08685672593597818, 0.16054565436957824, -0.16892576147332758, -0.06006034800685161, 0.38174393230057774, -0.06153182026032629, -0.029190365283284336, 0.28215170802920303, -0.18037883703683263, -0.21021178589885933, 0.1547128016602308, 0.1303177049154446, 0.11556113087346838, -0.1962515547413439, -0.0020406420627560075, -0.008279194966176405, 0.2101224279181371, 0.03996434630525689, 0.07917595456068914, 0.3113815889153029, 0.07849290092370563, 0.011698832442972719, 0.18282135630297783, -0.33119855075053617, -0.07032435000010376, -0.2602928699718999, -0.10559691508458327, -0.13049464185737195, 0.0457157802774154, -0.1410056259288878, -0.0822194949270793, 0.3276162724716649, 0.1768893919746211, 0.21749377354013455, 0.08213524630498854, 0.31886804234349136, 0.009839790228485776, 0.15492935542246297, 0.13353716268114024, 0.26505298435093266, 0.10391684245663665, 0.09064749414251456, -0.16383838069046877, -0.012074671432445382, -0.0030035370081966375]
|
706.181
|
A sufficient condition for a number to be the order of a nonsingular
derivation of a Lie algebra
|
A study of the set N_p of positive integers which occur as orders of
nonsingular derivations of finite-dimensional non-nilpotent Lie algebras of
characteristic p>0 was initiated by Shalev and continued by the present author.
The main goal of this paper is to show the abundance of elements of N_p. Our
main result shows that any divisor n of q-1, where q is a power of p, such that
$n\ge (p-1)^{1/p} (q-1)^{1-1/(2p)}$, belongs to N_p. This extends its special
case for p=2 which was proved in a previous paper by a different method.
|
math.RA math.NT
|
a study of the set n_p of positive integers which occur as orders of nonsingular derivations of finitedimensional nonnilpotent lie algebras of characteristic p0 was initiated by shalev and continued by the present author the main goal of this paper is to show the abundance of elements of n_p our main result shows that any divisor n of q1 where q is a power of p such that nge p11p q1112p belongs to n_p this extends its special case for p2 which was proved in a previous paper by a different method
|
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|
[-0.1778498045479258, 0.10381996047993501, -0.07373342816717923, -0.017865219350076383, -0.03525536099785111, -0.13430217518471183, -0.007862694333824846, 0.2755077375099063, -0.264664148632437, -0.2291880018181271, 0.04662567016332307, -0.24184094516612176, -0.14714951916959965, 0.19141997896755736, -0.10312735720330643, -0.0022655270288750116, 0.021888386437462437, 0.10819829222746194, -0.03989614180237469, -0.31380222911636035, 0.3956106085537208, -0.016937146545387805, 0.15830235658472197, 0.03602307135653165, 0.04327582319060134, -0.017448382845355406, -0.008572859283433192, 0.009519431822829777, -0.1587713313659252, 0.11252278390650948, 0.3034335828903649, 0.1140574773773551, 0.2881430107065373, -0.31881068559984366, -0.18965652684370676, 0.1873695364377151, 0.1586616810087839, 0.004588116475173996, -0.03395160079752613, -0.20364377037880735, 0.18517691237179357, -0.18353541462371747, -0.18858206785387463, -0.008661048220367068, 0.11942569222301244, 0.059057221077899964, -0.29691298423955836, 0.04195521144817273, 0.1865688830200169, 0.09556213103027808, -0.037050374953024504, -0.173908873869934, -0.01781449120802184, 0.0746146500007146, 0.03752264886732316, 0.07729177104645513, 0.03492078173181249, -0.0485619337297976, -0.10808670111000537, 0.37933551559431683, -0.01907976193405274, -0.1268857030611899, 0.12035028133023944, -0.20385730623254655, -0.1536890987617274, 0.12848610796370646, 0.08856089003384113, 0.2033127412199974, -0.040635057621532016, 0.1866454941524555, -0.13376436807836095, 0.12433453995424013, 0.11645371783524752, -0.06096718194377091, 0.10719871510001314, 0.11068945652805269, 0.05639777951421113, 0.15216782430393827, 0.020451759836739965, 0.021974991189522876, -0.3500719802479984, -0.20532635722516313, -0.19644658636663936, 0.14901361398062565, -0.0660740107813682, -0.1084256070252094, 0.4074353103836377, 0.11707461464943157, 0.2102387086022645, 0.08870830871423499, 0.23154266660826073, 0.09987276417297027, 0.027582557530452807, 0.040163712213850684, 0.12030064607970417, 0.19308336653824273, 0.020179529964096016, -0.17305815729002158, 0.02394580027192003, 0.1295481647623496]
|
706.1811
|
Direct determination of the epicycle frequency in the galactic disk, and
the derived rotation velocity V0
|
We present a method which allows a direct measurement of the epicycle
frequency $\kappa$ in the galactic disk, using the large database on open
clusters completed by our group. The observed velocity vector (amplitude and
direction) of the clusters in the galactic plane is derived from the catalog
data. In the epicycle approximation, this velocity is the sum of the circular
velocity, described by the galactic rotation curve, and of a residual velocity,
which has a direction that rotates with the frequency $\kappa$. If for some
reason the clusters are formed with non-random initial perturbation velocity
direction (measured for instance with respect to the direction of circular
rotation), then a plot of the orientation angle of the residual velocity as a
function of age reveals the epicycle frequency. The data analysis confirms that
this is the case; due to the non-random initial velocities, it is possible to
measure $\kappa$ for different galactic radii. Our analysis considers that the
effect of the arms on the stellar orbits is small (the Galactic potential is
mainly axis-symmetric); in this sense our results do not depend on any specific
model of the spiral structure, like the existence of a given number of spiral
arms, or on a particular choice of the radius of corotation. The values of
$\kappa$ provide constraints on the rotation velocity of the disk and on its
minimum beyond the solar radius; in particular, $V_0$ is found to be 226 $\pm$
15 kms$^{-1}$ even if the short scale (R$_0$ = 7.5 kpc) of the galaxy is
adopted. The mesured $\kappa$ at the solar radius is 42$\pm$4
kms$^{-1}$kpc$^{-1}$.
|
astro-ph
|
we present a method which allows a direct measurement of the epicycle frequency kappa in the galactic disk using the large database on open clusters completed by our group the observed velocity vector amplitude and direction of the clusters in the galactic plane is derived from the catalog data in the epicycle approximation this velocity is the sum of the circular velocity described by the galactic rotation curve and of a residual velocity which has a direction that rotates with the frequency kappa if for some reason the clusters are formed with nonrandom initial perturbation velocity direction measured for instance with respect to the direction of circular rotation then a plot of the orientation angle of the residual velocity as a function of age reveals the epicycle frequency the data analysis confirms that this is the case due to the nonrandom initial velocities it is possible to measure kappa for different galactic radii our analysis considers that the effect of the arms on the stellar orbits is small the galactic potential is mainly axissymmetric in this sense our results do not depend on any specific model of the spiral structure like the existence of a given number of spiral arms or on a particular choice of the radius of corotation the values of kappa provide constraints on the rotation velocity of the disk and on its minimum beyond the solar radius in particular v_0 is found to be 226 pm 15 kms1 even if the short scale r_0 75 kpc of the galaxy is adopted the mesured kappa at the solar radius is 42pm4 kms1kpc1
|
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|
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|
706.1812
|
Shell model study of neutron rich oxygen isotopes
|
Shell model calculations for low lying energy states of neutron rich oxygen
isotopes 19O, 20O, 21O, 22O, 23O, 24O, 25O, 26O have been performed using
OXBASH code. The configuration space consists of 0d5/2, 1s1/2, 0d3/2 orbital
for neutrons outside the 16O core. Different interactions namely, Wildenthal,
Preedom-Wildenthal, Wildenthal-Mcgrory and renormalized Kuo and Brown, which
are either empirical or realistic in nature have been used in the calculation,
The calculated energy spectrum are in good agreement with the experimental data
wherever available for the empirical interactions and the correct ordering of
levels is reproduced. The levels obtained from realistic interactions, though
have a small rms deviation, do not reproduce the correct ordering in some of
the cases. In the case of 21O, realistic interactions predict a much too
compressed 1/2+ state at energy 0.157 MeV compared to the experimental value of
1.218 MeV. For even isotopes the variation of the energy of the first 2+exited
state has been studied as a function of neutron number N. A sharp rise in the
value is observed at N=16 for both empirical and realistic interactions and
only at N=14 for empirical interactions. Significantly higher energy of first
2+ exited state compared to the value in the neighboring even-even nuclei is
considered as a signature for magic nuclei at N=14 and N=16.
|
nucl-th
|
shell model calculations for low lying energy states of neutron rich oxygen isotopes 19o 20o 21o 22o 23o 24o 25o 26o have been performed using oxbash code the configuration space consists of 0d52 1s12 0d32 orbital for neutrons outside the 16o core different interactions namely wildenthal preedomwildenthal wildenthalmcgrory and renormalized kuo and brown which are either empirical or realistic in nature have been used in the calculation the calculated energy spectrum are in good agreement with the experimental data wherever available for the empirical interactions and the correct ordering of levels is reproduced the levels obtained from realistic interactions though have a small rms deviation do not reproduce the correct ordering in some of the cases in the case of 21o realistic interactions predict a much too compressed 12 state at energy 0157 mev compared to the experimental value of 1218 mev for even isotopes the variation of the energy of the first 2exited state has been studied as a function of neutron number n a sharp rise in the value is observed at n16 for both empirical and realistic interactions and only at n14 for empirical interactions significantly higher energy of first 2 exited state compared to the value in the neighboring eveneven nuclei is considered as a signature for magic nuclei at n14 and n16
|
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|
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|
706.1813
|
Uniqueness of the EPR--chemeleon model
|
A classical deterministic, reversible dynamical systems, reproducing the
Einstein--Podolsky--Rosen (EPR) correlations in full respect of causality and
locality and without the introduction of any ad hoc selection procedure, was
constructed in the paper [AIR02].
In the present paper we prove that the above mentioned model is unique (see
Theorem (2) in the sense that any local causal probability measure which
reproduces the EPR correlations must coincide, under natural and generic
assumptions, with the one constructed in [AIR02].
[AIR02] L. Accardi, K. Imafuku and M. Regoli, "ON THE EPR--CHAMELEON
EXPERIMENT", Infinite Dimensional Analysis, Quantum Probability and Related
Topics, vol. 5 (2002) 1--20.
|
quant-ph
|
a classical deterministic reversible dynamical systems reproducing the einsteinpodolskyrosen epr correlations in full respect of causality and locality and without the introduction of any ad hoc selection procedure was constructed in the paper air02 in the present paper we prove that the above mentioned model is unique see theorem 2 in the sense that any local causal probability measure which reproduces the epr correlations must coincide under natural and generic assumptions with the one constructed in air02 air02 l accardi k imafuku and m regoli on the eprchameleon experiment infinite dimensional analysis quantum probability and related topics vol 5 2002 120
|
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|
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|
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