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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.2598 | Rachel Street | R.A. Street, D.J. Christian, W.I. Clarkson, A. Collier Cameron, B.
Enoch, S.R. Kane, T.A. Lister, R.G. West, D.M. Wilson, A. Evans, A.
Fitzsimmons, C.A. Haswell, C. Hellier, S.T. Hodgkin, K. Horne, J. Irwin, F.P.
Keenan, A.J. Norton, J. Osborne, D.L. Pollacco, R. Ryans, I. Skillen, P.J.
Wheatley, J. Barnes | SuperWASP-N Extra-solar Planet Candidates Between 18hr < RA < 21hr | 20 pages, 7 figures, accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc.379:816-832,2007 | 10.1111/j.1365-2966.2007.11987.x | null | astro-ph | null | The SuperWASP-I instrument observed 6.7 million stars between 8-15 mag from
La Palma during the 2004 May-September season. Our transit-hunting algorithm
selected 11,626 objects from the 184,442 stars within the range RA 18hr-21hr.
We describe our thorough selection procedure whereby catalogue information is
exploited along with careful study of the SuperWASP data to filter out, as far
as possible, transit mimics. We have identified 35 candidates which we
recommend for follow-up observations.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 20:19:12 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Street",
"R. A.",
""
],
[
"Christian",
"D. J.",
""
],
[
"Clarkson",
"W. I.",
""
],
[
"Cameron",
"A. Collier",
""
],
[
"Enoch",
"B.",
""
],
[
"Kane",
"S. R.",
""
],
[
"Lister",
"T. A.",
""
],
[
"West",
"R. G.",
""
],
[
"Wilson",
"D. M.",
""
],
[
"Evans",
"A.",
""
],
[
"Fitzsimmons",
"A.",
""
],
[
"Haswell",
"C. A.",
""
],
[
"Hellier",
"C.",
""
],
[
"Hodgkin",
"S. T.",
""
],
[
"Horne",
"K.",
""
],
[
"Irwin",
"J.",
""
],
[
"Keenan",
"F. P.",
""
],
[
"Norton",
"A. J.",
""
],
[
"Osborne",
"J.",
""
],
[
"Pollacco",
"D. L.",
""
],
[
"Ryans",
"R.",
""
],
[
"Skillen",
"I.",
""
],
[
"Wheatley",
"P. J.",
""
],
[
"Barnes",
"J.",
""
]
] |
0705.2599 | Alvaro de Souza Dutra | A. de Souza Dutra (UNESP-Campus de Guaratingueta-DFQ) | Quantum propagator for some classes of three-dimensional three-body
systems | 16 pages, no figures | Annals of Physics, vol. 321, Issue 5, May 2006, Pages 1092-1102 | 10.1016/j.aop.2005.09.007 | null | quant-ph | null | In this work we solve exactly a class of three-body propagators for the most
general quadratic interactions in the coordinates, for arbitrary masses and
couplings. This is done both for the constant as the time-dependent couplings
and masses, by using the Feynman path integral formalism. Finally the energy
spectrum and the eigenfunctions are recovered from the propagators.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 16:15:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dutra",
"A. de Souza",
"",
"UNESP-Campus de Guaratingueta-DFQ"
]
] |
0705.2600 | David Clarke | David Clarke | Thickness Dependence of the Reorientation Phase Transition | null | null | null | null | cond-mat.mtrl-sci | null | This report examines the thickness dependence of the reorientation phase
transition in ferromagnetic films with perpendicular anisotropy. That is, we
find the exact boundary of metastability of uniformly magnetized in-plane
states as the solution to a set of transcendental algebraic equations, and find
the profile of the initial instability in the magnetization in the direction
normal to the plane of the film. In general, this instability occurs at a
finite wave number k. We determine the dependence of k on the film thickness.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 20:36:43 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Clarke",
"David",
""
]
] |
0705.2601 | Lawrence Friedman | Lawrence H. Friedman | Predicting and Understanding Order of Heteroepitaxial Quantum Dots | under review | Journal of Electronic Materials 36, 1546 (2007) | 10.1007/s11664-007-0246-x | null | cond-mat.mtrl-sci | null | Heteroepitaxial self-assembled quantum dots (SAQDs) will allow breakthroughs
in electronics and optoelectronics. SAQDs are a result of Stranski-Krastanow
growth whereby a growing planar film becomes unstable after an initial wetting
layer is formed. Common systems are Ge$_{x}$Si$_{1-x}$/Si and
In$_{x}$Ga$_{1-x}$As/GaAs. For applications, SAQD arrays need to be ordered.
The role of crystal anisotropy, random initial conditions and thermal
fluctuations in influencing SAQD order during early stages of SAQD formation is
studied through a simple stochastic model of surface diffusion. Surface
diffusion is analyzed through a linear and perturbatively nonlinear analysis.
The role of crystal anisotropy in enhancing SAQD order is elucidated. It is
also found that SAQD order is enhanced when the deposited film is allowed to
evolve at heights near the critical wetting surface height that marks the onset
of non-planar film growth.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 20:46:39 GMT"
}
] | 2008-09-30T00:00:00 | [
[
"Friedman",
"Lawrence H.",
""
]
] |
0705.2602 | Sandy Leggett | S. K. Leggett (Gemini Observatory), M. S. Marley (NASA Ames), R.
Freedman (SETI), D. Saumon (LANL), Michael C. Liu (University of Hawaii), T.
R. Geballe (Gemini Observatory), D. A. Golimowski (Johns Hopkins University),
D. C. Stephens (BYU) | Physical and Spectral Characteristics of the T8 and Later-Type Dwarfs | 34 pages including 10 figures and two tables; accepted for
publication in the Astrophysical Journal | Astrophys.J.667:537-548,2007 | 10.1086/519948 | null | astro-ph | null | We use new and published near-IR spectra, with synthetic spectra, to derive
physical properties of three of the latest-type T dwarfs. A new R~1700 spectrum
of the T7.5 dwarf HD 3651B, with existing data, allows a detailed comparison to
the well-studied and very similar dwarf, Gl 570D. We find that HD 3651B has
both higher gravity and metallicity than Gl 570D, with Teff=820-830K, log g=
5.4-5.5, [m/H]= +0.2 and Kzz=10^4cm^2/s. Its age is 8-12 Gyr and its implied
mass is 60-70 M_Jup. We perform a similar analyis of the T8 and T7.5 dwarfs
2MASS J09393548-2448279 and 2MASS J11145133-2618235 using published data,
comparing them to the well-studied T8, 2MASS J04151954-0935066. We find that
the two dwarfs have the same Teff as the reference dwarf, and similar
gravities, but lower metallicities. The parameters are Teff=725-775K and [m/H]=
-0.3; log g=5.3-5.45 for 2MASS J09393548-2448279 and log g=5.0-5.3 for 2MASS
J11145133- 261823. The age and mass are ~10Gyr and 60M_Jup for 2MASS
J09393548-2448279, and ~5 Gyr and 40M_Jup for 2MASS J11145133-261823. A serious
limitation is the incompleteness of the line lists of CH4 and NH3 at lambda
<1.7um. Spectra of Saturn and Jupiter, and of laboratory CH4 and NH3 gas,
suggest that NH3 features in the Y- and J-bands may be useful as indicators of
the next cooler spectral type, and not features in the H- and K-bands as
previously thought. However large uncertainties remain, as the abundance of NH3
is likely to be significantly below the chemical equilibrium value, and
inclusion of laboratory NH3 opacities predicts band shapes that are discrepant
with existing data. It is possible that the T spectral class will have to be
extended to low temperatures around 400K, when water clouds condense in the
atmosphere [abridged].
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 20:47:22 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Leggett",
"S. K.",
"",
"Gemini Observatory"
],
[
"Marley",
"M. S.",
"",
"NASA Ames"
],
[
"Freedman",
"R.",
"",
"SETI"
],
[
"Saumon",
"D.",
"",
"LANL"
],
[
"Liu",
"Michael C.",
"",
"University of Hawaii"
],
[
"Geballe",
"T. R.",
"",
"Gemini Observatory"
],
[
"Golimowski",
"D. A.",
"",
"Johns Hopkins University"
],
[
"Stephens",
"D. C.",
"",
"BYU"
]
] |
0705.2603 | Tim Lister | T. A. Lister, R. G. West, D. M. Wilson, A. Collier Cameron, W. I.
Clarkson, R. A. Street, B. Enoch, N. R. Parley, D. J. Christian, S. R. Kane,
A. Evans, A. Fitzsimmons, C. A. Haswell, C. Hellier, S. T. Hodgkin, Keith
Horne, J. Irwin, F. P. Keenan, A. J. Norton, J. Osborne, D. L. Pollacco, R.
Ryans, I. Skillen, P. J. Wheatley, J. R. Barnes | SuperWASP-North Extrasolar Planet Candidates. Candidates from Fields
17hr < RA < 18hr | 17 pages, 24 figures, accepted by MNRAS | Mon.Not.Roy.Astron.Soc.379:647-662,2007 | 10.1111/j.1365-2966.2007.11948.x | null | astro-ph | null | We have performed photometric observations of nearly 7 million stars with 8 <
V < 15 with the SuperWASP-North instrument from La Palma between 2004
May-September. Fields in the RA range 17-18hr, yielding over 185,000 stars with
sufficient quality data, have been searched for transits using a modified box
least-squares (BLS) algorithm. We find a total of 58 initial transiting
candidates which have high S/N in the BLS, show multiple transit-like dips and
have passed visual inspection. Analysis of the blending and inferred planetary
radii for these candidates leaves a total of 7 transiting planet candidates
which pass all the tests plus 4 which pass the majority. We discuss the derived
parameters for these candidates and their properties and comment on the
implications for future transit searches.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 21:14:38 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Lister",
"T. A.",
""
],
[
"West",
"R. G.",
""
],
[
"Wilson",
"D. M.",
""
],
[
"Cameron",
"A. Collier",
""
],
[
"Clarkson",
"W. I.",
""
],
[
"Street",
"R. A.",
""
],
[
"Enoch",
"B.",
""
],
[
"Parley",
"N. R.",
""
],
[
"Christian",
"D. J.",
""
],
[
"Kane",
"S. R.",
""
],
[
"Evans",
"A.",
""
],
[
"Fitzsimmons",
"A.",
""
],
[
"Haswell",
"C. A.",
""
],
[
"Hellier",
"C.",
""
],
[
"Hodgkin",
"S. T.",
""
],
[
"Horne",
"Keith",
""
],
[
"Irwin",
"J.",
""
],
[
"Keenan",
"F. P.",
""
],
[
"Norton",
"A. J.",
""
],
[
"Osborne",
"J.",
""
],
[
"Pollacco",
"D. L.",
""
],
[
"Ryans",
"R.",
""
],
[
"Skillen",
"I.",
""
],
[
"Wheatley",
"P. J.",
""
],
[
"Barnes",
"J. R.",
""
]
] |
0705.2604 | Tshilidzi Marwala | Tshilidzi Marwala and Christina Busisiwe Vilakazi | Computational Intelligence for Condition Monitoring | 23 pages | null | null | null | cs.CE | null | Condition monitoring techniques are described in this chapter. Two aspects of
condition monitoring process are considered: (1) feature extraction; and (2)
condition classification. Feature extraction methods described and implemented
are fractals, Kurtosis and Mel-frequency Cepstral Coefficients. Classification
methods described and implemented are support vector machines (SVM), hidden
Markov models (HMM), Gaussian mixture models (GMM) and extension neural
networks (ENN). The effectiveness of these features were tested using SVM, HMM,
GMM and ENN on condition monitoring of bearings and are found to give good
results.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 21:20:58 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Marwala",
"Tshilidzi",
""
],
[
"Vilakazi",
"Christina Busisiwe",
""
]
] |
0705.2605 | N. Raj Rao | N. Raj Rao and Alan Edelman | Sample eigenvalue based detection of high dimensional signals in white
noise using relatively few samples | Submitted to the IEEE Transactions on Signal Processing (In Review) | null | null | null | math.ST stat.TH | null | We present a mathematically justifiable, computationally simple, sample
eigenvalue based procedure for estimating the number of high-dimensional
signals in white noise using relatively few samples. The main motivation for
considering a sample eigenvalue based scheme is the computational simplicity
and the robustness to eigenvector modelling errors which are can adversely
impact the performance of estimators that exploit information in the sample
eigenvectors.
There is, however, a price we pay by discarding the information in the sample
eigenvectors; we highlight a fundamental asymptotic limit of sample eigenvalue
based detection of weak/closely spaced high-dimensional signals from a limited
sample size. This motivates our heuristic definition of the effective number of
identifiable signals which is equal to the number of "signal" eigenvalues of
the population covariance matrix which exceed the noise variance by a factor
strictly greater than 1+sqrt(Dimensionality of the system/Sample size). The
fundamental asymptotic limit brings into sharp focus why, when there are too
few samples available so that the effective number of signals is less than the
actual number of signals, underestimation of the model order is unavoidable (in
an asymptotic sense) when using any sample eigenvalue based detection scheme,
including the one proposed herein. The analysis reveals why adding more sensors
can only exacerbate the situation. Numerical simulations are used to
demonstrate that the proposed estimator consistently estimates the true number
of signals in the dimension fixed, large sample size limit and the effective
number of identifiable signals in the large dimension, large sample size limit.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 21:43:41 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Rao",
"N. Raj",
""
],
[
"Edelman",
"Alan",
""
]
] |
0705.2606 | Henning Samtleben | Henning Samtleben, Martin Weidner | Gauging hidden symmetries in two dimensions | 38 pages, 2 figures, v2: minor corrections, version published in JHEP | JHEP0708:076,2007 | 10.1088/1126-6708/2007/08/076 | ENSL-00147449 | hep-th | null | We initiate the systematic construction of gauged matter-coupled supergravity
theories in two dimensions. Subgroups of the affine global symmetry group of
toroidally compactified supergravity can be gauged by coupling vector fields
with minimal couplings and a particular topological term. The gauge groups
typically include hidden symmetries that are not among the target-space
isometries of the ungauged theory. The possible gaugings are described
group-theoretically in terms of a constant embedding tensor subject to a number
of constraints which parametrizes the different theories and entirely encodes
the gauged Lagrangian.
The prime example is the bosonic sector of the maximally supersymmetric
theory whose ungauged version admits an affine E_9 global symmetry algebra. The
various parameters (related to higher-dimensional p-form fluxes, geometric and
non-geometric fluxes, etc.) which characterize the possible gaugings, combine
into an embedding tensor transforming in the basic representation of E_9. This
yields an infinite-dimensional class of maximally supersymmetric theories in
two dimensions. We work out and discuss several examples of higher-dimensional
origin which can be systematically analyzed using the different gradings of
E_9.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 13:54:38 GMT"
},
{
"version": "v2",
"created": "Mon, 5 Nov 2007 22:31:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Samtleben",
"Henning",
""
],
[
"Weidner",
"Martin",
""
]
] |
0705.2607 | Max Shpak | Max Shpak | Selection Against Demographic Stochasticity in Age-Structured
Populations | null | null | null | null | q-bio.PE | null | It has been shown that differences in fecundity variance can influence the
probability of invasion of a genotype in a population, i.e. a genotype with
lower variance in offspring number can be favored in finite populations even if
it has a somewhat lower mean fitness than a competitor. In this paper,
Gillespie's results are extended to population genetic systems with explicit
age structure, where the demographic variance (variance in growth rate)
calculated in the work of Engen and colleagues is used as a generalization of
"variance in offspring number" to predict the interaction between deterministic
and random forces driving change in allele frequency. By calculating the
variance from the life history parameters, it is shown that selection against
variance in the growth rate will favor a genotypes with lower stochasticity in
age specific survival and fertility rates. A diffusion approximation for
selection and drift in a population with two genotypes with different life
history matrices (and therefore, different growth rates and demographic
variances) is derived and shown to be consistent with individual based
simulations. It is also argued that for finite populations, perturbation
analyses of both the growth rate and demographic variances may be necessary to
determine the sensitivity of "fitness" (broadly defined) to changes in the life
history parameters.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 21:44:00 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Shpak",
"Max",
""
]
] |
0705.2608 | Tadashi Ochiai | Tadashi Ochiai, Fabien Trihan | On the Selmer groups of abelian varieties over function fields of
characteristic p>0 | 21 pages | null | 10.1017/S0305004108001801 | null | math.NT math.AG | null | In this paper, we study a (p-adic) geometric analogue for abelian varieties
over a function field of characteristic p of the cyclotomic Iwasawa theory and
the non-commutative Iwasawa theory for abelian varieties over a number field
initiated by Mazur and Coates respectively. We will prove some analogue of the
principal results obtained in the case over a number field and we study new
phenomena which did not happen in the case of number field case. We propose
also a conjecture which might be considered as a counterpart of the principal
conjecture in the case over a number field. \par This is a preprint which is
distributed since 2005 which is still in the process of submision. Following a
recent modification of some technical mistakes in the previous version of the
paper as well as an amelioration of the presentation of the paper, we decide
wider distribution via the archive.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 21:46:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ochiai",
"Tadashi",
""
],
[
"Trihan",
"Fabien",
""
]
] |
0705.2609 | Andrey Grozin | A. G. Grozin, T. Huber, D. Maitre | On one master integral for three-loop on-shell HQET propagator diagrams
with mass | 6 pages, 1 figure; v3: completely re-written, 2 new authors, many new
results, additional references | JHEP0707:033,2007 | 10.1088/1126-6708/2007/07/033 | null | hep-ph | null | An exact expression for the master integral I_2 arising in three-loop
on-shell HQET propagator diagrams with mass is derived and its analytical
expansion in the dimensional regularization parameter epsilon is given.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 22:10:59 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 17:03:36 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Jun 2007 14:09:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Grozin",
"A. G.",
""
],
[
"Huber",
"T.",
""
],
[
"Maitre",
"D.",
""
]
] |
0705.2610 | Rudy Gilmore | Rudy C. Gilmore | Mass Limits on Neutralino Dark Matter | 11 pages, 3 figures | Phys.Rev.D76:043520,2007 | 10.1103/PhysRevD.76.043520 | null | hep-ph | null | We set an upper limit on the mass of a supersymmetric neutralino dark matter
particle using the MicrOMEGAS and DarkSUSY software packages and the most
recent constraints on relic density from combined WMAP and SDSS data. We
explore several different possible scenarios within the MSSM, including
coannihilation with charginos and sfermions and annihilation through a massive
Higgs resonance, using low energy mass inputs. We find that no coannihilation
scenario is consistent with dark matter in observed abundance with a mass
greater than 2.5 TeV for a wino--type particle or 1.8 TeV for a Higgsino--type.
Contrived scenarios involving Higgs resonances with finely--tuned mass
parameters can allow masses as high as 34 TeV. The resulting gamma--ray energy
distribution is not in agreement with the recent multi--TeV gamma ray spectrum
observed by H.E.S.S. originating from the center of the Milky Way. Our results
are relevent only for dark matter densities resulting from a thermal origin.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 22:14:04 GMT"
},
{
"version": "v2",
"created": "Thu, 16 Aug 2007 00:55:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gilmore",
"Rudy C.",
""
]
] |
0705.2611 | Kimball A. Milton | Kimball A. Milton, Prachi Parashar, K. V. Shajesh, Jef Wagner | How does Casimir energy fall? II. Gravitational acceleration of quantum
vacuum energy | 8 pages, no figures, REVTeX4, appendix and references added | J.Phys.A40:10935-10943,2007 | 10.1088/1751-8113/40/35/014 | null | hep-th gr-qc quant-ph | null | It has been demonstrated that quantum vacuum energy gravitates according to
the equivalence principle, at least for the finite Casimir energies associated
with perfectly conducting parallel plates. We here add further support to this
conclusion by considering parallel semitransparent plates, that is,
delta-function potentials, acting on a massless scalar field, in a spacetime
defined by Rindler coordinates (tau,x,y,xi). Fixed xi in such a spacetime
represents uniform acceleration. We calculate the force on systems consisting
of one or two such plates at fixed values of xi. In the limit of large Rindler
coordinate xi (small acceleration), we recover (via the equivalence principle)
the situation of weak gravity, and find that the gravitational force on the
system is just Mg, where g is the gravitational acceleration and M is the total
mass of the system, consisting of the mass of the plates renormalized by the
Casimir energy of each plate separately, plus the energy of the Casimir
interaction between the plates. This reproduces the previous result in the
limit as the coupling to the delta-function potential approaches infinity.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 22:42:06 GMT"
},
{
"version": "v2",
"created": "Sat, 7 Jul 2007 00:21:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Milton",
"Kimball A.",
""
],
[
"Parashar",
"Prachi",
""
],
[
"Shajesh",
"K. V.",
""
],
[
"Wagner",
"Jef",
""
]
] |
0705.2612 | Mario Silveirinha G. | Mario Silveirinha, Nader Engheta | Theory of Supercoupling, Squeezing Wave Energy, and Field Confinement in
Narrow Channels and Tight Bends Using Epsilon-Near-Zero Metamaterials | under review | null | 10.1103/PhysRevB.76.245109 | null | cond-mat.mtrl-sci | null | In this work, we investigate the detailed theory of the supercoupling,
anomalous tunneling effect, and field confinement originally identified in [M.
Silveirinha, N. Engheta, Phys. Rev. Lett. 97, 157403, (2006)], where we
demonstrated the possibility of using materials with permittivity near zero to
drastically improve the transmission of electromagnetic energy through a narrow
irregular channel with very subwavelength transverse cross-section. Here, we
present additional physical insights, describe new applications of the
tunneling effect in relevant waveguide scenarios (e.g., the "perfect" or
"super" waveguide coupling), study the effect of metal losses in the metallic
walls, and the possibility of using epsilon-near zero materials to confine
energy in a subwavelength cavity with gigantic field enhancement. In addition,
we systematically study the propagation of electromagnetic waves through narrow
channels filled with anisotropic epsilon-near zero materials. It is
demonstrated that these materials may have interesting potentials, and that for
some particular geometries the reflectivity of the channel is independent of
the specific dimensions or parameters of epsilon-near zero transition. We also
describe several realistic metamaterial implementations of the studied
problems, based on standard metallic waveguides, microstrip line
configurations, and wire media.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 22:44:26 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 14:08:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Silveirinha",
"Mario",
""
],
[
"Engheta",
"Nader",
""
]
] |
0705.2613 | Adan Cabello | Adan Cabello, Pilar Moreno | Bipartite all-versus-nothing proofs of Bell's theorem with single-qubit
measurements | REVTeX4, 4 pages, 2 figures | Phys. Rev. Lett. 99 (2007) 220402 | 10.1103/PhysRevLett.99.220402 | null | quant-ph | null | If we distribute n qubits between two parties, which quantum pure states and
distributions of qubits would allow all-versus-nothing (or
Greenberger-Horne-Zeilinger-like) proofs of Bell's theorem using only
single-qubit measurements? We show a necessary and sufficient condition for the
existence of these proofs for any number of qubits, and provide all distinct
proofs up to n=7 qubits. Remarkably, there is only one distribution of a state
of n=4 qubits, and six distributions, each for a different state of n=6 qubits,
which allow these proofs.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 23:16:47 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 19:52:48 GMT"
},
{
"version": "v3",
"created": "Wed, 28 Nov 2007 09:33:42 GMT"
}
] | 2009-07-28T00:00:00 | [
[
"Cabello",
"Adan",
""
],
[
"Moreno",
"Pilar",
""
]
] |
0705.2614 | Vadim Astakhov | Vadim Astakhov, Tamara Astakhova | Brain Prostheses as a Dynamic System (Immortalizing the Human Brain?) | 9 pages, 5 figures | null | null | null | physics.gen-ph | null | Interest in development of brain prostheses, which might be proposed to
recover mental functions lost due to neuron-degenerative disease or trauma,
requires new methods in molecular engineering and nanotechnology to build
artificial brain tissues. We develop a Dynamic Core model to analyze complexity
of damaged biological neural network as well as transition and recovery of the
system functionality due to changes in the system environment. We provide a
method to model complexity of physical systems which might be proposed as an
artificial tissue or prosthesis. Delocalization of Dynamic Core model is
developed to analyze migration of mental functions in dynamic bio-systems which
undergo architecture transition induced by trauma. Term Dynamic Core is used to
define a set of causally related functions and Delocalization is used to
describe the process of migration. Information geometry and topological
formalisms are proposed to analyze information processes. A holographic model
is proposed to construct dynamic environment with self-poetic Dynamic Core
which preserve functional properties under transition from one host to another.
We found statistical constraints for complex systems which conserve a Dynamic
Core under environment transition. Also we suggest those constraints might
provide recommendations for nanotechnologies and tissue engineering used in
development of an artificial brain tissue.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 23:18:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Astakhov",
"Vadim",
""
],
[
"Astakhova",
"Tamara",
""
]
] |
0705.2615 | Takasada Shibauchi | Y. Shimono, T. Shibauchi, Y. Kasahara, T. Kato, K. Hashimoto, Y.
Matsuda, J. Yamaura, Y. Nagao, and Z. Hiroi | Effects of Rattling Phonons on the Quasiparticle Excitation and Dynamics
in the Superconducting $\beta$-Pyrochlore KOs$_2$O$_6$ | 5 pages, 5 figures, to be published in Phys. Rev. Lett | Phys. Rev. Lett. 98, 257004 (2007). | 10.1103/PhysRevLett.98.257004 | null | cond-mat.supr-con cond-mat.str-el | null | Microwave penetration depth $\lambda$ and surface resistance at 27 GHz are
measured in high quality crystals of KOs$_2$O$_6$. Firm evidence for
fully-gapped superconductivity is provided from $\lambda(T)$. Below the second
transition at $T_{\rm p}\sim 8$ K, the superfluid density shows a step-like
change with a suppression of effective critical temperature $T_{\rm c}$.
Concurrently, the extracted quasiparticle scattering time shows a steep
enhancement, indicating a strong coupling between the anomalous rattling motion
of K ions and quasiparticles. The results imply that the rattling phonons help
to enhance superconductivity, and that K sites freeze to an ordered state with
long quasiparticle mean free path below $T_{\rm p}$.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 23:23:33 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Shimono",
"Y.",
""
],
[
"Shibauchi",
"T.",
""
],
[
"Kasahara",
"Y.",
""
],
[
"Kato",
"T.",
""
],
[
"Hashimoto",
"K.",
""
],
[
"Matsuda",
"Y.",
""
],
[
"Yamaura",
"J.",
""
],
[
"Nagao",
"Y.",
""
],
[
"Hiroi",
"Z.",
""
]
] |
0705.2616 | Roberto Bonciani | U. Aglietti, R. Bonciani, L. Grassi and E. Remiddi | The Two Loop Crossed Ladder Vertex Diagram with Two Massive Exchanges | 42 pages, 1 figure | Nucl.Phys.B789:45-83,2008 | 10.1016/j.nuclphysb.2007.07.019 | ROME1/1446-06, IFIC/07-22 | hep-ph | null | We compute the (three) master integrals for the crossed ladder diagram with
two exchanged quanta of equal mass. The differential equations obeyed by the
master integrals are used to generate power series expansions centered around
all the singular (plus some regular) points, which are then matched numerically
with high accuracy. The expansions allow a fast and precise numerical
calculation of the three master integrals (better than 15 digits with less than
30 terms in the whole real axis). A conspicuous relation with the equal-mass
sunrise in two dimensions is found. Comparison with a previous large momentum
expansion is made finding complete agreement.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 23:25:52 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aglietti",
"U.",
""
],
[
"Bonciani",
"R.",
""
],
[
"Grassi",
"L.",
""
],
[
"Remiddi",
"E.",
""
]
] |
0705.2617 | Zhang Xiao-Bing | Xiao-Bing Zhang | Note on color neutral solutions of the $K^0$ condensed color-flavor
locked phase | null | null | null | null | hep-ph | null | In the presence of nonzero strange quark mass $m_s$, we investigate color
neutrality in the $K^0$ condensed phase of color-flavor locked quark matter. By
treating the $m_s$ effects on both kaon condensate and Fermi-surface phenomenon
self-consistently, we develop a new treatment to evaluate color neutral
solutions within the model-independent framework. It is pointed out that, in
the general sense, the expectation values of gluon fields obtained from
dynamics of Goldstone bosons solely are not identified with the factual color
chemical potentials.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 00:19:41 GMT"
}
] | 2017-03-07T00:00:00 | [
[
"Zhang",
"Xiao-Bing",
""
]
] |
0705.2618 | Thorwald Stein | P. Horvai, S. V. Nazarenko, T. H. M. Stein (University of Warwick) | Coalescence of particles by differential sedimentation | 26 pages, 7 figures. Accepted by J.Stat.Phys., 12 November 2007.
Sections 2.4 and 3.1 expanded for more elaborate derivation of equations | null | 10.1007/s10955-007-9466-y | null | cond-mat.stat-mech | null | We consider a three dimensional system consisting of a large number of small
spherical particles, distributed in a range of sizes and heights (with uniform
distribution in the horizontal direction). Particles move vertically at a
size-dependent terminal velocity. They are either allowed to merge whenever
they cross or there is a size ratio criterion enforced to account for collision
efficiency. Such a system may be described, in mean field approximation, by the
Smoluchowski kinetic equation with a differential sedimentation kernel, used to
study e.g. rain initiation and particle distributions in the atmosphere. We
solve the kinetic equation analytically to obtain steady state and self-similar
solutions in time and in height, using methods borrowed from weak turbulence
theory. Analytical results are compared with direct numerical simulations (DNS)
of moving and merging particles, and a good agreement is found.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 00:31:20 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Dec 2007 14:16:51 GMT"
}
] | 2007-12-05T00:00:00 | [
[
"Horvai",
"P.",
"",
"University of Warwick"
],
[
"Nazarenko",
"S. V.",
"",
"University of Warwick"
],
[
"Stein",
"T. H. M.",
"",
"University of Warwick"
]
] |
0705.2619 | Kevin Heng | Kevin Heng, Matthew van Adelsberg, Richard McCray and John C. Raymond | The Transition Zone in Balmer-Dominated Shocks | 25 pages, 8 figures. Accepted by Astrophysical Journal | null | 10.1086/521298 | null | astro-ph | null | We examine the structure of the post-shock region in supernova remnants
(SNRs). The ``shock transition zone'' is set up by charge transfer and
ionization events between atoms and ions, and has a width $\sim 10^{15}$
cm$^{-2}$ $n^{-1}_0$, where $n_0$ is the total pre-shock density (including
both atoms and ions). For Balmer-dominated SNRs with shock velocity $v_s
\gtrsim 1000$ km s$^{-1}$, the Rankine-Hugoniot conditions for ion velocity and
temperature are obeyed instantly, leaving the full width at half-maximum (FWHM)
of the broad H$\alpha$ line versus $v_s$ relation intact. However, the spatial
variation in the post-shock densities is relevant to the problem of Ly$\alpha$
resonant scattering in young, core-collapse SNRs. Both two- (pre-shock atoms
and ions) and three-component (pre-shock atoms, broad neutrals and ions) models
are considered. We compute the spatial emissivities of the broad ($\xi_b$) and
narrow ($\xi_n$) H$\alpha$ lines; a calculation of these emissivities in SN
1006 is in general agreement with the computed ones of Raymond et al. (2007).
The (dimensionless) spatial shift, $\Theta_{\rm{shift}}$, between the centroids
of $\xi_b$ and $\xi_n$ is unique for a given shock velocity and $f_{\rm{ion}}$,
the pre-shock ion fraction. Measurements of $\Theta_{\rm{shift}}$ can be used
to constrain $n_0$.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 00:42:01 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 07:58:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Heng",
"Kevin",
""
],
[
"van Adelsberg",
"Matthew",
""
],
[
"McCray",
"Richard",
""
],
[
"Raymond",
"John C.",
""
]
] |
0705.2620 | Anton Dochtermann | Anton Dochtermann | Homotopy groups of Hom complexes of graphs | 20 pages, 6 figures, final version, to be published in J. Combin.
Theory Ser. A | null | null | null | math.CO math.AT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The notion of $\times$-homotopy from \cite{DocHom} is investigated in the
context of the category of pointed graphs. The main result is a long exact
sequence that relates the higher homotopy groups of the space $\Hom_*(G,H)$
with the homotopy groups of $\Hom_*(G,H^I)$. Here $\Hom_*(G,H)$ is a space
which parametrizes pointed graph maps from $G$ to $H$ (a pointed version of the
usual $\Hom$ complex), and $H^I$ is the graph of based paths in $H$. As a
corollary it is shown that $\pi_i \big(\Hom_*(G,H) \big) \cong [G,\Omega^i
H]_{\times}$, where $\Omega H$ is the graph of based closed paths in $H$ and
$[G,K]_{\times}$ is the set of $\times$-homotopy classes of pointed graph maps
from $G$ to $K$. This is similar in spirit to the results of \cite{BBLL}, where
the authors seek a space whose homotopy groups encode a similarly defined
homotopy theory for graphs. The categorical connections to those constructions
are discussed.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 00:50:56 GMT"
},
{
"version": "v2",
"created": "Thu, 15 May 2008 10:35:05 GMT"
},
{
"version": "v3",
"created": "Mon, 7 Jul 2008 09:18:21 GMT"
}
] | 2008-07-07T00:00:00 | [
[
"Dochtermann",
"Anton",
""
]
] |
0705.2621 | Guo-Li Wang | Guo-Li Wang | Decay constants of $P$-wave mesons | 11 pages,5 tables,version to be published in Phys. Lett. B | Phys.Lett.B650:15-21,2007 | 10.1016/j.physletb.2007.05.001 | null | hep-ph | null | Decay constants of $P$-wave mesons are computed in the framework of
instantaneous Bethe-Salpeter method (Salpeter method). By analyzing the parity
and possible charge conjugation parity, we give the relativistic configurations
of wave functions with definite parity and possible charge conjugation parity.
With these wave functions as input, the full Salpeter equations for different
$P$-wave states are solved, and the mass spectra as well as the numerical
values of wave functions are obtained. Finally we compute the leptonic decay
constants of heavy-heavy and heavy-light $^3P_0$, $^3P_1$ and $^1P_1$ states.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 01:13:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wang",
"Guo-Li",
""
]
] |
0705.2622 | Murugeswaran Duraisamy | Murugeswaran Duraisamy | Unparticle physics in e^+ e^- annihilation | this paper has been withdrawn | null | null | null | hep-ph | null | In the recent past,unparticle physics effects have been explored in detail in
both the fermionic and bosonic sectors. We have used fermionic unparticles to
study the cross-section of electron-positron annihilation to light
pseudo-scalar meson pairs e^+e^- ->PP. We show that this cross-section is
sensitive to the scaling dimension d_U<1.4.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 14:01:51 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 01:55:44 GMT"
},
{
"version": "v3",
"created": "Sun, 27 May 2007 02:23:39 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Duraisamy",
"Murugeswaran",
""
]
] |
0705.2623 | Dale Rolfsen | Adam Clay and Dale Rolfsen | Densely ordered braid subgroups | null | null | null | null | math.GR math.AT | null | Dehornoy showed that the Artin braid groups $B_n$ are left-orderable. This
ordering is discrete, but we show that, for $n >2$ the Dehornoy ordering, when
restricted to certain natural subgroups, becomes a dense ordering. Among
subgroups which arise are the commutator subgroup and the kernel of the Burau
representation (for those $n$ for which the kernel is nontrivial). These
results follow from a characterization of least positive elements of any normal
subgroup of $B_n$ which is discretely ordered by the Dehornoy ordering.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 19:42:18 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Clay",
"Adam",
""
],
[
"Rolfsen",
"Dale",
""
]
] |
0705.2624 | Bing Dong | Bing Dong, X.L. Lei, N. J. M. Horing | Elimination of negative differential conductance in an asymmetric
molecular transistor by an ac-voltage | Accepted by Appl. Phys. Lett | Appl. Phys. Lett. 90, 242101 (2007). | 10.1063/1.2748090 | null | cond-mat.mes-hall cond-mat.str-el | null | We analyze resonant tunneling subject to a non-adiabatic time-dependent
bias-voltage through an asymmetric single molecular quantum dot with coupling
between the electronic and vibrational degrees of freedom using a {\em
Tien-Gordon-type} rate equation. Our results clearly exhibit the appearance of
photon-assisted satellites in the current-voltage characteristics and the
elimination of hot-phonon-induced negative differential conductance with
increasing ac driving amplitude for an asymmetric system. This can be ascribed
to an {\em ac-induced suppression} of unequilibrated (hot) phonons in an
asymmetric system.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 02:08:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dong",
"Bing",
""
],
[
"Lei",
"X. L.",
""
],
[
"Horing",
"N. J. M.",
""
]
] |
0705.2625 | Dylan Helliwell | Dylan Helliwell | Boundary Regularity for Conformally Compact Einstein Metrics in Even
Dimensions | 30 pages, minor typos corrected, content in section 7 clarified,
references updated | null | null | null | math.DG | null | We study boundary regularity for conformally compact Einstein metrics in even
dimensions by generalizing the ideas of Michael Anderson. Our method of
approach is to view the vanishing of the Ambient Obstruction tensor as an nth
order system of equations for the components of a compactification of the given
metric. This, together with boundary conditions that the compactification is
shown to satisfy provide enough information to apply classical boundary
regularity results. These results then provide local and global versions of
finite boundary regularity for the components of the compactification.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 02:09:18 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Apr 2008 17:09:56 GMT"
}
] | 2008-04-08T00:00:00 | [
[
"Helliwell",
"Dylan",
""
]
] |
0705.2626 | Andrew Knyazev | A. V. Knyazev, M. E. Argentati, I. Lashuk, and E. E. Ovtchinnikov | Block Locally Optimal Preconditioned Eigenvalue Xolvers (BLOPEX) in
hypre and PETSc | Submitted to SIAM Journal on Scientific Computing | SIAM Journal on Scientific Computing (SISC). 25(5): 2224-2239,
2007 | 10.1137/060661624 | UCDHSC-CCM-251 | cs.MS cs.NA | null | We describe our software package Block Locally Optimal Preconditioned
Eigenvalue Xolvers (BLOPEX) publicly released recently. BLOPEX is available as
a stand-alone serial library, as an external package to PETSc (``Portable,
Extensible Toolkit for Scientific Computation'', a general purpose suite of
tools for the scalable solution of partial differential equations and related
problems developed by Argonne National Laboratory), and is also built into {\it
hypre} (``High Performance Preconditioners'', scalable linear solvers package
developed by Lawrence Livermore National Laboratory). The present BLOPEX
release includes only one solver--the Locally Optimal Block Preconditioned
Conjugate Gradient (LOBPCG) method for symmetric eigenvalue problems. {\it
hypre} provides users with advanced high-quality parallel preconditioners for
linear systems, in particular, with domain decomposition and multigrid
preconditioners. With BLOPEX, the same preconditioners can now be efficiently
used for symmetric eigenvalue problems. PETSc facilitates the integration of
independently developed application modules with strict attention to component
interoperability, and makes BLOPEX extremely easy to compile and use with
preconditioners that are available via PETSc. We present the LOBPCG algorithm
in BLOPEX for {\it hypre} and PETSc. We demonstrate numerically the scalability
of BLOPEX by testing it on a number of distributed and shared memory parallel
systems, including a Beowulf system, SUN Fire 880, an AMD dual-core Opteron
workstation, and IBM BlueGene/L supercomputer, using PETSc domain decomposition
and {\it hypre} multigrid preconditioning. We test BLOPEX on a model problem,
the standard 7-point finite-difference approximation of the 3-D Laplacian, with
the problem size in the range $10^5-10^8$.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 02:25:16 GMT"
}
] | 2010-06-02T00:00:00 | [
[
"Knyazev",
"A. V.",
""
],
[
"Argentati",
"M. E.",
""
],
[
"Lashuk",
"I.",
""
],
[
"Ovtchinnikov",
"E. E.",
""
]
] |
0705.2627 | T. Symul | Thomas Symul, Daniel J. Alton, Syed M. Assad, Andrew M. Lance,
Christian Weedbrook, Timothy C. Ralph, Ping Koy Lam | Experimental Demonstration of Post-Selection based Continuous Variable
Quantum Key Distribution in the Presence of Gaussian Noise | 4 pages, 4 figures | null | 10.1103/PhysRevA.76.030303 | null | quant-ph | null | In realistic continuous variable quantum key distribution protocols, an
eavesdropper may exploit the additional Gaussian noise generated during
transmission to mask her presence. We present a theoretical framework for a
post-selection based protocol which explicitly takes into account excess
Gaussian noise. We derive a quantitative expression of the secret key rates
based on the Levitin and Holevo bounds. We experimentally demonstrate that the
post-selection based scheme is still secure against both individual and
collective Gaussian attacks in the presence of this excess noise.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 03:07:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Symul",
"Thomas",
""
],
[
"Alton",
"Daniel J.",
""
],
[
"Assad",
"Syed M.",
""
],
[
"Lance",
"Andrew M.",
""
],
[
"Weedbrook",
"Christian",
""
],
[
"Ralph",
"Timothy C.",
""
],
[
"Lam",
"Ping Koy",
""
]
] |
0705.2628 | Pablo Shmerkin | Yuval Peres and Pablo Shmerkin | Resonance between Cantor sets | To appear in Ergodic Theory and Dynamical Systems. 24 pages, 2
figures | Ergodic Theory Dynam. Systems 29 (2009), no. 1, 201--221 | null | null | math.CA math.DS | null | Let $C_a$ be the central Cantor set obtained by removing a central interval
of length $1-2a$ from the unit interval, and continuing this process
inductively on each of the remaining two intervals. We prove that if $\log
b/\log a$ is irrational, then \[ \dim(C_a+C_b) = \min(\dim(C_a) + \dim(C_b),1),
\] where $\dim$ is Hausdorff dimension. More generally, given two self-similar
sets $K,K'$ in $\RR$ and a scaling parameter $s>0$, if the dimension of the
arithmetic sum $K+sK'$ is strictly smaller than $\dim(K)+\dim(K') \le 1$
(``geometric resonance''), then there exists $r<1$ such that all contraction
ratios of the similitudes defining $K$ and $K'$ are powers of $r$ (``algebraic
resonance''). Our method also yields a new result on the projections of planar
self-similar sets generated by an iterated function system that includes a
scaled irrational rotation.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 04:08:27 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Mar 2008 11:09:12 GMT"
}
] | 2013-03-21T00:00:00 | [
[
"Peres",
"Yuval",
""
],
[
"Shmerkin",
"Pablo",
""
]
] |
0705.2629 | J. Wade Cherrington | J. Wade Cherrington, J. Daniel Christensen, Igor Khavkine | Dual Computations of Non-abelian Yang-Mills on the Lattice | v1: 18 pages, 7 figures, v2: Many changes to appendix, minor changes
throughout, references and figures added, v3: minor corrections, 22 pages | Phys.Rev.D76:094503,2007 | 10.1103/PhysRevD.76.094503 | null | hep-lat hep-th | null | In the past several decades there have been a number of proposals for
computing with dual forms of non-abelian Yang-Mills theories on the lattice.
Motivated by the gauge-invariant, geometric picture offered by dual models and
successful applications of duality in the U(1) case, we revisit the question of
whether it is practical to perform numerical computation using non-abelian dual
models. Specifically, we consider three-dimensional SU(2) pure Yang-Mills as an
accessible yet non-trivial case in which the gauge group is non-abelian. Using
methods developed recently in the context of spin foam quantum gravity, we
derive an algorithm for efficiently computing the dual amplitude and describe
Metropolis moves for sampling the dual ensemble. We relate our algorithms to
prior work in non-abelian dual computations of Hari Dass and his collaborators,
addressing several problems that have been left open. We report results of spin
expectation value computations over a range of lattice sizes and couplings that
are in agreement with our conventional lattice computations. We conclude with
an outlook on further development of dual methods and their application to
problems of current interest.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 04:23:19 GMT"
},
{
"version": "v2",
"created": "Sat, 23 Jun 2007 23:34:42 GMT"
},
{
"version": "v3",
"created": "Thu, 12 Jul 2007 16:12:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cherrington",
"J. Wade",
""
],
[
"Christensen",
"J. Daniel",
""
],
[
"Khavkine",
"Igor",
""
]
] |
0705.2630 | Hao Zheng | Hao Zheng | A geometric categorification of tensor products of $U_q(sl_2)$-modules | 44pages, made up some mistakes in the proof of Theorem 4.2.4 | null | null | null | math.RT math.QA | null | We give a purely geometric categorification of tensor products of
finite-dimensional simple $U_q(sl_2)$-modules and $R$-matrices on them. The
work is developed in the framework of category of perverse sheaves and the
categorification theorems are understood as consequences of Deligne's theory of
weights.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 09:59:00 GMT"
},
{
"version": "v2",
"created": "Sat, 19 May 2007 05:04:42 GMT"
},
{
"version": "v3",
"created": "Sat, 9 Jun 2007 08:38:51 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Zheng",
"Hao",
""
]
] |
0705.2631 | Hiroaki Yamada | H. Yamada, E. B. Starikov and D. Hennig | Quantum Diffusion in Polaron Model of poly(dG)-poly(dC) and
poly(dA)-poly(dT) DNA polymers | 17pages, 8figures | null | 10.1140/epjb/e2007-00274-4 | null | cond-mat.soft | null | We numerically investigate quantum diffusion of an electron in a model of
poly(dG)-poly(dC) and poly(dA)-poly(dT) DNA polymers with fluctuation of the
parameters due to the impact of colored noise. The randomness is introduced by
fluctuations of distance between two consecutive bases along the stacked base
pairs. We demonstrate that in the model the decay time of the correlation can
control the spread of the electronic wavepacket. Furthermore it is shown that
in a motional narrowing regime the averaging over fluctuation causes ballistic
propagation of the wavepacket, and in the adiabatic regime the electronic
states are affected by localization.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 04:57:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yamada",
"H.",
""
],
[
"Starikov",
"E. B.",
""
],
[
"Hennig",
"D.",
""
]
] |
0705.2632 | Piljin Yi | Deog Ki Hong, Mannque Rho, Ho-Ung Yee, and Piljin Yi | Dynamics of Baryons from String Theory and Vector Dominance | 65pages, 3 figures, vector mesons and axial-vector mesons are now
canonically normalized (comparisons with data and conclusions unaffected) | JHEP0709:063,2007 | 10.1088/1126-6708/2007/09/063 | KIAS-P07017, PNUTP-07/A03 | hep-th hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a holographic model of QCD from string theory, a la Sakai and
Sugimoto, and study baryons. In this model, mesons are collectively realized as
a five-dimensional \$U(N_F)=U(1)\times SU(N_F)$ Yang-Mills field and baryons
are classically identified as $SU(N_F)$ solitons with a unit Pontryagin number
and $N_c$ electric charges. The soliton is shown to be very small in the large
't Hooft coupling limit, allowing us to introduce an effective field ${\cal
B}$. Its coupling to the mesons are dictated by the soliton structure, and
consists of a direct magnetic coupling to the $SU(N_F)$ field strength as well
as a minimal coupling to the $U(N_F)$ gauge field. Upon the dimensional
reduction, this effective action reproduces all interaction terms between
nucleons and an infinite tower of mesons in a manner consistent with the large
$N_c$ expansion. We further find that all electromagnetic interactions, as
inferred from the same effective action via a holographic prescription, are
mediated by an infinite tower of vector mesons, rendering the baryon
electromagnetic form factors completely vector-dominated as well. We estimate
nucleon-meson couplings and also the anomalous magnetic moments, which compare
well with nature.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 06:03:02 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 01:47:56 GMT"
},
{
"version": "v3",
"created": "Tue, 10 Mar 2009 02:03:54 GMT"
}
] | 2009-03-10T00:00:00 | [
[
"Hong",
"Deog Ki",
""
],
[
"Rho",
"Mannque",
""
],
[
"Yee",
"Ho-Ung",
""
],
[
"Yi",
"Piljin",
""
]
] |
0705.2633 | Sohrab Behnia | Sohrab Behnia, Afshin Akhshani, Amir Akhavan, Hadi Mahmodi | Applications of tripled chaotic maps in cryptography | 21 pages, 10 figures | Chaos, Solitons and Fractals 40 (2009) 505-519 | 10.1016/j.chaos.2007.08.013 | null | nlin.CD | null | Security of information has become a major issue during the last decades. New
algorithms based on chaotic maps were suggested for protection of different
types of multimedia data, especially digital images and videos in this period.
However, many of them fundamentally were flawed by a lack of robustness and
security. For getting higher security and higher complexity, in the current
paper, we introduce a new kind of symmetric key block cipher algorithm that is
based on \emph{tripled chaotic maps}. In this algorithm, the utilization of two
coupling parameters, as well as the increased complexity of the cryptosystem,
make a contribution to the development of cryptosystem with higher security. In
order to increase the security of the proposed algorithm, the size of key space
and the computational complexity of the coupling parameters should be increased
as well. Both the theoretical and experimental results state that the proposed
algorithm has many capabilities such as acceptable speed and complexity in the
algorithm due to the existence of two coupling parameter and high security.
Note that the ciphertext has a flat distribution and has the same size as the
plaintext. Therefore, it is suitable for practical use in secure
communications.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 06:09:28 GMT"
}
] | 2010-10-22T00:00:00 | [
[
"Behnia",
"Sohrab",
""
],
[
"Akhshani",
"Afshin",
""
],
[
"Akhavan",
"Amir",
""
],
[
"Mahmodi",
"Hadi",
""
]
] |
0705.2634 | Wen-Yu Wen | Wen-Yu Wen | 2D Heisenberg model from rotating membrane | 15 pages, revtex file, no figure | Nucl.Phys.B791:164-174,2008 | 10.1016/j.nuclphysb.2007.09.027 | null | hep-th | null | We study a rotating probe membrane in S^3 inside AdS_4 x S^7 background of
M-theory. With (partial) gauge fixing, we show that in the fast limit the
worldvolume of tensionless membrane reduces to either the XXX_1/2 spin chain or
the two-dimensional SU(2) Heisenberg spin model. Later we introduce the
anisotropy and couple it to the external magnetic field. We also establish the
correspondence for higher dimensional (D)p-branes.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 06:19:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wen",
"Wen-Yu",
""
]
] |
0705.2635 | Chandrasekhar Chatterjee | Chandrasekhar Chatterjee, Amitabha Lahiri | Confinement of monopole using flux string | 3 pages, Presented by C.Chatterjee at 17th DAE-BRNS High Energy
Physics Symposium (HEP06), Kharagpur, India, 11-16 Dec 2006 | null | null | null | hep-ph | null | We study the confinement of fermionic magnetic monopoles by a thin flux tube
of the Abelian Higgs model. Parity demands that the monopole currents be axial.
This implies that the model is consistent only if there are at least two
species of fermions being confined.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 06:45:05 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chatterjee",
"Chandrasekhar",
""
],
[
"Lahiri",
"Amitabha",
""
]
] |
0705.2636 | Dominique Manchon | Kurusch Ebrahimi-Fard, Dominique Manchon, Fr\'ed\'eric Patras | New identities in dendriform algebras | 16 pages, LaTeX. Concrete examples and applications added | Journal of Algebra 320, 708-727 (2008) | 10.1016/j.jalgebra.2007.12.013 | null | math.CO math.RA | null | Dendriform structures arise naturally in algebraic combinatorics (where they
allow, for example, the splitting of the shuffle product into two pieces) and
through Rota-Baxter algebra structures (the latter appear, among others, in
differential systems and in the renormalization process of pQFT). We prove new
combinatorial identities in dendriform dialgebras that appear to be strongly
related to classical phenomena, such as the combinatorics of Lyndon words,
rewriting rules in Lie algebras, or the fine structure of the
Malvenuto-Reutenauer algebra. One of these identities is an abstract
noncommutative, dendriform, generalization of the Bohnenblust-Spitzer identity
and of an identity involving iterated Chen integrals due to C.S. Lam.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 06:46:22 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 09:16:27 GMT"
}
] | 2021-02-01T00:00:00 | [
[
"Ebrahimi-Fard",
"Kurusch",
""
],
[
"Manchon",
"Dominique",
""
],
[
"Patras",
"Frédéric",
""
]
] |
0705.2637 | Alper Kiraz | A. Kiraz, A. Kurt, and M. A. D\"undar, M. Y. Y\"uce, and A. L. Demirel | A method for volume stabilization of single, dye-doped water
microdroplets with femtoliter resolution | to appear in the J. Op. Soc. Am. B | null | 10.1364/JOSAB.24.001824 | null | physics.optics physics.ao-ph | null | A self-control mechanism that stabilizes the size of Rhodamine B-doped water
microdroplets standing on a superhydrophobic surface is demonstrated. The
mechanism relies on the interplay between the condensation rate that was kept
constant and evaporation rate induced by laser excitation which critically
depends on the size of the microdroplets. The radii of individual water
microdroplets (>5 um) stayed within a few nanometers during long time periods
(up to 455 seconds). By blocking the laser excitation for 500 msec, the stable
volume of individual microdroplets was shown to change stepwise.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 06:47:10 GMT"
}
] | 2016-08-14T00:00:00 | [
[
"Kiraz",
"A.",
""
],
[
"Kurt",
"A.",
""
],
[
"Dündar",
"M. A.",
""
],
[
"Yüce",
"M. Y.",
""
],
[
"Demirel",
"A. L.",
""
]
] |
0705.2638 | Yuri Shchekinov A. | A. Kopp, Yu. A. Shchekinov | Radiation-condensation instability in a four-fluid dusty plasma | 7 pages, 3 figures, accepted in Physics of Plasmas | null | 10.1063/1.2746872 | null | physics.plasm-ph astro-ph | null | In this work linear stability analysis of a four-fluid optically thin plasma
consisting of electrons, ions, neutral atoms, and charged dust particles is
performed with respect to the radiation-condensation (RC) instability. The
energy budget of the plasma involves the input from heating through
photo-electron emission by dust particles under external ultraviolet radiation
as well as radiative losses in inelastic electron-neutral, electron-ion,
neutral-neutral collisions. It is shown that negatively charged particles
stimulate the RC instability in the sense that the conditions for the
instability to hold are wider than similar conditions in a single-fluid
description.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 07:05:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kopp",
"A.",
""
],
[
"Shchekinov",
"Yu. A.",
""
]
] |
0705.2639 | Matteo Beccaria | M.Beccaria, Yu.L.Dokshitzer, G.Marchesini | Twist 3 of the sl(2) sector of N=4 SYM and reciprocity respecting
evolution | 18 pages, 1 eps figure | Phys.Lett.B652:194-202,2007 | 10.1016/j.physletb.2007.07.016 | null | hep-th hep-ph | null | We consider the bosonic sl(2) sector of the maximally supersymmetric N=4 SYM
model and show that anomalous dimension of the twist-3 single-trace composite
operators built of scalar fields, recently calculated up to the four-loop
order, can be generated by a compact reciprocity respecting evolution kernel.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 07:23:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Beccaria",
"M.",
""
],
[
"Dokshitzer",
"Yu. L.",
""
],
[
"Marchesini",
"G.",
""
]
] |
0705.2640 | Satya N. Majumdar | Alain Comtet, Satya N. Majumdar and Stephane Ouvry | Integer Partitions and Exclusion Statistics | 16 pages, 4 .eps figures included | J. Phys. A: Math.Theor. 40, 11255 (2007) | 10.1088/1751-8113/40/37/004 | null | cond-mat.stat-mech math-ph math.CO math.MP | null | We provide a combinatorial description of exclusion statistics in terms of
minimal difference $p$ partitions. We compute the probability distribution of
the number of parts in a random minimal $p$ partition. It is shown that the
bosonic point $ p=0$ is a repulsive fixed point for which the limiting
distribution has a Gumbel form. For all positive $p$ the distribution is shown
to be Gaussian.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 07:28:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Comtet",
"Alain",
""
],
[
"Majumdar",
"Satya N.",
""
],
[
"Ouvry",
"Stephane",
""
]
] |
0705.2641 | Mikhail Shirokov I. | M. I. Shirokov | Wave packets in quantum theory of collisions | 14 pages | null | 10.1134/S1063779608050067 | null | quant-ph | null | Two methodological troubles of the quantum theory of collisions are
considered. The first is the undesirable interference of the incident and
scattered waves in the stationary approach to scattering. The second concerns
the nonstationary approach to the theory of collisions of the type $a+b\to
c+d$. In order to calculate the cross section one uses the matrix element
$<cd|S|ab>$ of the $S$-matrix. The element is proportional to $\delta$-function
expressing the energy conservation. The corresponding probability $|<
cd|S|ab>|^2$ contains $\delta^2$ which is mathematically senseless. The known
regular way to overcome the difficulty seems to be unsatisfactory. In this
paper, both the troubles are resolved using wave packets of incident particles.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 07:31:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shirokov",
"M. I.",
""
]
] |
0705.2642 | David A. Green Dr | D. A. Green | Comments on the radio spectrum of HB 3 | Accepted for publication by the Bulletin of the Astronomical Society
of India | 2007, BASI, vol35, pp77-85 | null | null | astro-ph | null | It has recently been suggested that the radio spectrum of the Galactic
supernova remnant HB 3 shows flattening at higher frequencies (above about 1
GHz). Here I review the radio spectrum of HB 3, noting the difficulties in
deriving accurate flux densities for this remnant, particularly at high
frequencies, due to the proximity of bright, thermal emission from W3 and its
surroundings. A flux density for HB 3 at 2695 MHz is derived from Effelsberg
survey data. The spectrum of HB 3 is well represented by a simple power-law
spectrum from 22 to 2695 MHz, with a spectral index of 0.56 +/- 0.03. It is
concluded that contamination with thermal emission from adjacent regions is the
cause for the reported spectral flattening of HB 3.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 07:35:30 GMT"
}
] | 2007-08-15T00:00:00 | [
[
"Green",
"D. A.",
""
]
] |
0705.2643 | Hermann Nicolai | Thibault Damour and Hermann Nicolai | Symmetries,Singularities and the De-Emergence of Space | 10 pages | null | 10.1142/S0218271808012206 | AEI - 2007 - 013 | hep-th | null | Recent work has revealed intriguing connections between a
Belinsky-Khalatnikov-Lifshitz-type analysis of spacelike singularities in
General Relativity and certain infinite dimensional Lie algebras, and in
particular the `maximally extended' hyperbolic Kac--Moody algebra E10. In this
essay we argue that these results may lead to an entirely new understanding of
the (quantum) nature of space(-time) at the Planck scale, and hence -- via an
effective `de-emergence' of space near a singularity -- to a novel mechanism
for achieving background independence in quantum gravity.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 07:48:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Damour",
"Thibault",
""
],
[
"Nicolai",
"Hermann",
""
]
] |
0705.2644 | Saikat Chatterjee | Saikat Chatterjee, Amitabha Lahiri | Generalized vector field | Talk delivered by 3 pages, S.Chatterjee at at 17th DAE-BRNS High
Energy Physics Symposium (HEP06), Kharagpur IIT, India, 11-16 Dec 2006 | null | null | null | math-ph math.MP | null | We define generalized vector fields, and contraction and Lie derivatives with
respect to them. Generalized commutators are also defined.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:07:27 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chatterjee",
"Saikat",
""
],
[
"Lahiri",
"Amitabha",
""
]
] |
0705.2645 | Stefano Piscanec | C. Casiraghi, A. Hartschuh, E. Lidorikis, H. Qian, H. Harutyunyan, T.
Gokus, K. S. Novoselov, A. C. Ferrari | Rayleigh Imaging of Graphene and Graphene Layers | 8 pages, 9 figures | Nano Lett. 7, 2711 (2007) | 10.1021/nl071168m | null | cond-mat.mtrl-sci | null | We investigate graphene and graphene layers on different substrates by
monochromatic and white-light confocal Rayleigh scattering microscopy. The
image contrast depends sensitively on the dielectric properties of the sample
as well as the substrate geometry and can be described quantitatively using the
complex refractive index of bulk graphite. For few layers (<6) the
monochromatic contrast increases linearly with thickness: the samples behave as
a superposition of single sheets which act as independent two dimensional
electron gases. Thus, Rayleigh imaging is a general, simple and quick tool to
identify graphene layers, that is readily combined with Raman scattering, which
provides structural identification.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 10:37:47 GMT"
}
] | 2008-01-07T00:00:00 | [
[
"Casiraghi",
"C.",
""
],
[
"Hartschuh",
"A.",
""
],
[
"Lidorikis",
"E.",
""
],
[
"Qian",
"H.",
""
],
[
"Harutyunyan",
"H.",
""
],
[
"Gokus",
"T.",
""
],
[
"Novoselov",
"K. S.",
""
],
[
"Ferrari",
"A. C.",
""
]
] |
0705.2646 | Martin Weigt | Michele Leone, Sumedha, Martin Weigt | Clustering by soft-constraint affinity propagation: Applications to
gene-expression data | 11 pages, supplementary material:
http://isiosf.isi.it/~weigt/scap_supplement.pdf | Bioinformatics 23, 2708 (2007) | 10.1093/bioinformatics/btm414 | null | q-bio.QM cond-mat.stat-mech physics.data-an | null | Motivation: Similarity-measure based clustering is a crucial problem
appearing throughout scientific data analysis. Recently, a powerful new
algorithm called Affinity Propagation (AP) based on message-passing techniques
was proposed by Frey and Dueck \cite{Frey07}. In AP, each cluster is identified
by a common exemplar all other data points of the same cluster refer to, and
exemplars have to refer to themselves. Albeit its proved power, AP in its
present form suffers from a number of drawbacks. The hard constraint of having
exactly one exemplar per cluster restricts AP to classes of regularly shaped
clusters, and leads to suboptimal performance, {\it e.g.}, in analyzing gene
expression data. Results: This limitation can be overcome by relaxing the AP
hard constraints. A new parameter controls the importance of the constraints
compared to the aim of maximizing the overall similarity, and allows to
interpolate between the simple case where each data point selects its closest
neighbor as an exemplar and the original AP. The resulting soft-constraint
affinity propagation (SCAP) becomes more informative, accurate and leads to
more stable clustering. Even though a new {\it a priori} free-parameter is
introduced, the overall dependence of the algorithm on external tuning is
reduced, as robustness is increased and an optimal strategy for parameter
selection emerges more naturally. SCAP is tested on biological benchmark data,
including in particular microarray data related to various cancer types. We
show that the algorithm efficiently unveils the hierarchical cluster structure
present in the data sets. Further on, it allows to extract sparse gene
expression signatures for each cluster.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:22:05 GMT"
},
{
"version": "v2",
"created": "Thu, 29 Nov 2007 16:40:18 GMT"
}
] | 2007-11-29T00:00:00 | [
[
"Leone",
"Michele",
""
],
[
"Sumedha",
"",
""
],
[
"Weigt",
"Martin",
""
]
] |
0705.2647 | Ali N. Khorramian | S. Atashbar Tehrani and Ali N. Khorramian | The Jacobi Polynomials QCD analysis for the polarized structure function | 23 pages, 8 figures and 4 tables | JHEP 0707:048,2007 | 10.1088/1126-6708/2007/07/048 | IPM/P-2007/035 | hep-ph | null | We present the results of our QCD analysis for polarized quark distribution
and structure function $xg_1 (x,Q^2)$. We use very recently experimental data
to parameterize our model. New parameterizations are derived for the quark and
gluon distributions for the kinematic range $x \epsilon [10^{-8},1]$, $Q^2
\epsilon [1,10^6]$ GeV^2. The analysis is based on the Jacobi polynomials
expansion of the polarized structure functions. Our calculations for polarized
parton distribution functions based on the Jacobi polynomials method are in
good agreement with the other theoretical models. The values of $\Lambda_{QCD}$
and $\alpha_s(M_z)$ are determined.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:22:11 GMT"
},
{
"version": "v2",
"created": "Tue, 31 Jul 2007 14:10:33 GMT"
}
] | 2009-04-22T00:00:00 | [
[
"Tehrani",
"S. Atashbar",
""
],
[
"Khorramian",
"Ali N.",
""
]
] |
0705.2648 | Schehr Gregory | Gregory Schehr, Satya N. Majumdar | Statistics of the Number of Zero Crossings : from Random Polynomials to
Diffusion Equation | 4 pages, 3 figures. Minor changes. Accepted version in Phys. Rev.
Lett | Phys. Rev. Lett. 99, 060603 (2007) | 10.1103/PhysRevLett.99.060603 | null | cond-mat.stat-mech cond-mat.dis-nn math.PR | null | We consider a class of real random polynomials, indexed by an integer d, of
large degree n and focus on the number of real roots of such random
polynomials. The probability that such polynomials have no real root in the
interval [0,1] decays as a power law n^{-\theta(d)} where \theta(d)>0 is the
exponent associated to the decay of the persistence probability for the
diffusion equation with random initial conditions in space dimension d. For n
even, the probability that such polynomials have no root on the full real axis
decays as n^{-2(\theta(d) + \theta(2))}. For d=1, this connection allows for a
physical realization of real random polynomials. We further show that the
probability that such polynomials have exactly k real roots in [0,1] has an
unusual scaling form given by n^{-\tilde \phi(k/\log n)} where \tilde \phi(x)
is a universal large deviation function.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 09:03:05 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 08:51:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schehr",
"Gregory",
""
],
[
"Majumdar",
"Satya N.",
""
]
] |
0705.2649 | Christophe Dupont | F. Berteloot, C. Dupont, L. Molino | Normalization of bundle holomorphic contractions and applications to
dynamics | 29 pages, references added, to appear in Ann. Inst. Fourier | null | null | null | math.DS math.CV | null | We establish a Poincar\'e-Dulac theorem for sequences (G_n)_n of holomorphic
contractions whose differentials d_0 G_n split regularly. The resonant
relations determining the normal forms hold on the moduli of the exponential
rates of contraction. Our results are actually stated in the framework of
bundle maps.
Such sequences of holomorphic contractions appear naturally as iterated
inverse branches of endomorphisms of CP(k). In this context, our normalization
result allows to precisely estimate the distortions of ellipsoids along typical
orbits. As an application, we show how the Lyapunov exponents of the
equilibrium measure are approximated in terms of the multipliers of the
repulsive cycles.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:26:08 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Feb 2008 09:20:46 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Berteloot",
"F.",
""
],
[
"Dupont",
"C.",
""
],
[
"Molino",
"L.",
""
]
] |
0705.2650 | Han Ju Lee | Han Ju Lee | Strong peak points and denseness of strong peak functions | null | null | null | null | math.FA | null | Let $C_b(K)$ be the set of all bounded continuous (real or complex) functions
on a complete metric space $K$ and $A$ a closed subspace of $C_b(K)$. Using the
variational method, it is shown that the set of all strong peak functions in
$A$ is dense if and only if the set of all strong peak points is a norming
subset of $A$. As a corollary we show that if $X$ is a locally uniformly
convex, complex Banach space, then the set of all strong peak functions in
$\mathcal{A}(B_X)$ is a dense $G_\delta$ subset. Moreover if $X$ is separable,
smooth and locally uniformly convex, then the set of all norm and numerical
strong peak functions in $\mathcal{A}_u(B_X:X)$ is a dense $G_\delta$ subset.
In case that a set of uniformly strongly exposed points of a (real or complex)
Banach space $X$ is a norming subset of $\mathcal{P}({}^n X)$ for some $n\ge
1$, then the set of all strongly norm attaining elements in $\mathcal{P}({}^n
X)$ is dense, in particular, the set of all points at which the norm of
$\mathcal{P}({}^n X)$ is Fr\'echet differentiable is a dense $G_\delta$ subset.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:26:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lee",
"Han Ju",
""
]
] |
0705.2651 | Fredrik Schoeier | F. L. Schoeier, H. Olofsson, T. Wong, D. Fong, M. Lindqvist, L. O.
Sjouwerman | Non-equilibrium chemistry and dust formation in AGB stars as probed by
SiO line emission | 2 pages, 1 figure. To be published in the proceedings of the
conference "Why Galaxies Care about AGB Stars", held in Vienna, August 7-11,
2006; F. Kerschbaum, C. Charbonnel, B. Wing eds, ASP Conf.Ser. in press | null | null | null | astro-ph | null | We have performed high spatial resolution observations of SiO line emission
for a sample of 11 AGB stars using the ATCA, VLA and SMA interferometers.
Detailed radiative transfer modelling suggests that there are steep chemical
gradients of SiO in their circumstellar envelopes. The emerging picture is one
where the radial SiO abundance distribution starts at an initial high
abundance, in the case of M-stars consistent with LTE chemistry, that
drastically decreases at a radius of ~1E15 cm. This is consistent with a
scenario where SiO freezes out onto dust grains. The region of the wind with
low abundance is much more extended, typically ~1E16 cm, and limited by
photodissociation. The surpisingly high SiO abundances found in carbon stars
requires non-equilibrium chemical processes.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:28:32 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Schoeier",
"F. L.",
""
],
[
"Olofsson",
"H.",
""
],
[
"Wong",
"T.",
""
],
[
"Fong",
"D.",
""
],
[
"Lindqvist",
"M.",
""
],
[
"Sjouwerman",
"L. O.",
""
]
] |
0705.2652 | Chao Hang | Chao Hang and Guoxiang Huang | Weak-Light Ultraslow Vector Optical Solitons via Electromagnetically
Induced Transparency | 4 pages, 4 figures | null | 10.1103/PhysRevA.77.033830 | null | physics.optics | null | We propose a scheme to generate temporal vector optical solitons in a
lifetime broadened five-state atomic medium via electromagnetically induced
transparency. We show that this scheme, which is fundamentally different from
the passive one by using optical fibers, is capable of achieving
distortion-free vector optical solitons with ultraslow propagating velocity
under very weak drive conditions. We demonstrate both analytically and
numerically that it is easy to realize Manakov temporal vector solitons by
actively manipulating the dispersion and self- and cross-phase modulation
effects of the system.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:30:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hang",
"Chao",
""
],
[
"Huang",
"Guoxiang",
""
]
] |
0705.2653 | Evgeny Kurbatov | E. P. Kurbatov (INASAN, Russian Acad. Sci.) | On star formation rate and turbulent dissipation in galactic models | Published in Proceedings of the 14th Young Scientists Conference on
Astronomy and Space Physics, Kyiv, Ukraine, April 23-28, 2007 | YSC'14 Proceedings of Contributed Papers (eds. G. Ivashchenko, A.
Golovin), Kyiv, Kyivskyi Universytet, pp. 54-58, 2007 | null | null | astro-ph | null | The models of star formation function and of dissipation of turbulent energy
of interstellar medium are proposed. In star formation model the feedback of
supernovae is taken into account. It is shown that hierarchical scenario of
galaxy formation with proposed models is able to explain the observable star
formation pause in the Galaxy.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:36:13 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 07:20:27 GMT"
},
{
"version": "v3",
"created": "Wed, 25 Jul 2007 13:46:44 GMT"
},
{
"version": "v4",
"created": "Mon, 10 Dec 2007 18:48:00 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Kurbatov",
"E. P.",
"",
"INASAN, Russian Acad. Sci."
]
] |
0705.2654 | Fredrik Schoeier | F. L. Schoeier | Methods for determining AGB mass loss rates based on radio data | 10 pages, 5 figures. o be published in the proceedings of the
conference "Why Galaxies Care about AGB Stars", held in Vienna, August 7-11,
2006; F. Kerschbaum, C. Charbonnel, B. Wing eds, ASP Conf.Ser. in press | null | null | null | astro-ph | null | In the radio regime the mass-loss rate of AGB stars is best probed using
molecular (and atomic) line emission arising in the CSE formed by the stellar
wind. The numerical modelling of the circumstellar emission where intricate
interplays between physical and chemical processes take place, is a challenge.
The derived mass-loss rates depend crucially on the assumptions in the
circumstellar model, of which some can be constrained if enough observational
data exist. Therefore, a reliable mass-loss-rate determination for an
individual star requires, in addition to a detailed radiative transfer
analysis, good observational constraints in the form of multi-line observations
and radial brightness distributions. Of the methods used to estimate mass-loss
rates from galactic AGB stars those based on radiative transfer modelling of CO
line emission are most commonly used and possibly also the most accurate.
Typically, CO multi-transitional observations can constrain the mass-loss rate
to better than 50%, within the adopted circumstellar model. Comparison with
complementary methods, such as estimates based on dust radiative transfer
modelling coupled with a dynamical model, are consistent within a factor of
three.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:42:54 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Schoeier",
"F. L.",
""
]
] |
0705.2655 | Stefan Popescu | Stefan Popescu and Bernhard Rothenstein | Counting energy packets in the electromagnetic wave | 10 pages, 4 figures, detailed foundation | null | null | null | physics.gen-ph | null | We discuss the concept of energy packets in respect to the energy transported
by electromagnetic waves and we demonstrate that this physical quantity can be
used in physical problems involving relativistic effects. This refined concept
provides results compatible to those obtained by simpler definition of energy
density when relativistic effects apply to the free electromagnetic waves. We
found this concept further compatible to quantum theory perceptions and we show
how it could be used to conciliate between different physical approaches
including the classical electromagnetic wave theory, the special relativity and
the quantum theories.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:46:53 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Popescu",
"Stefan",
""
],
[
"Rothenstein",
"Bernhard",
""
]
] |
0705.2656 | Xin Zhang | Xin Zhang, Yi Ling | Inflationary universe in loop quantum cosmology | 21 pages, 4 figures; accepted for publication in JCAP | JCAP0708:012,2007 | 10.1088/1475-7516/2007/08/012 | null | gr-qc astro-ph hep-ph hep-th | null | Loop quantum cosmology provides a nice solution of avoiding the big bang
singularity through a big bounce mechanism in the high energy region. In loop
quantum cosmology an inflationary universe is emergent after the big bounce, no
matter what matter component is filled in the universe. A super-inflation phase
without phantom matter will appear in a certain way in the initial stage after
the bounce; then the universe will undergo a normal inflation stage. We discuss
the condition of inflation in detail in this framework. Also, for slow-roll
inflation, we expect the imprint from the effects of the loop quantum cosmology
should be left in the primordial perturbation power spectrum. However, we show
that this imprint is too weak to be observed.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:48:10 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jul 2007 08:49:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zhang",
"Xin",
""
],
[
"Ling",
"Yi",
""
]
] |
0705.2657 | Young-Ho Song | Young-Ho Song, Rimantas Lazauskas, Tae-Sun Park, Dong-Pil Min | Effective field theory approach for the M1 properties of A=2 and 3
nuclei | 14 pages, 2figures | Phys.Lett.B656:174-181,2007 | 10.1016/j.physletb.2007.09.038 | null | nucl-th | null | The magnetic moments of ${}^2{H}$, ${}^3{He}$ and ${}^3{H}$ as well as the
thermal neutron capture rate on the proton are calculated using heavy baryon
chiral perturbation theory {\it \`{a} la} Weinberg. The M1 operators have been
derived up to {N$^3$LO}. The nuclear matrix elements are evaluated with the use
of wave functions obtained by carrying out variational Monte Carlo calculations
for a realistic nuclear Hamiltonian involving high-precision phenomenological
potentials like Argonne Av18 and Urbana IX tri-nucleon interactions. We discuss
the potential- and cutoff-dependence of the results.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:49:47 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Mar 2008 05:52:10 GMT"
}
] | 2008-04-10T00:00:00 | [
[
"Song",
"Young-Ho",
""
],
[
"Lazauskas",
"Rimantas",
""
],
[
"Park",
"Tae-Sun",
""
],
[
"Min",
"Dong-Pil",
""
]
] |
0705.2658 | Pierbiagio Pieri | A. Spuntarelli, P. Pieri, G.C. Strinati | The Josephson effect throughout the BCS-BEC crossover | 4 pages, 3 figures; improved version to appear in Phys. Rev. Lett | Phys. Rev. Lett. 99, 040401 (2007) | 10.1103/PhysRevLett.99.040401 | null | cond-mat.other cond-mat.supr-con | null | We study the stationary Josephson effect for neutral fermions across the
BCS-BEC crossover, by solving numerically the Bogoliubov-de Gennes equations at
zero temperature. The Josephson current is found to be considerably enhanced
for all barriers at about unitarity. For vanishing barrier, the Josephson
critical current approaches the Landau limiting value which, depending on the
coupling, is determined by either pair-breaking or sound-mode excitations. In
the coupling range from the BCS limit to unitarity, a procedure is proposed to
extract the pairing gap from the Landau limiting current.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:51:22 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Jun 2007 17:42:34 GMT"
}
] | 2007-07-25T00:00:00 | [
[
"Spuntarelli",
"A.",
""
],
[
"Pieri",
"P.",
""
],
[
"Strinati",
"G. C.",
""
]
] |
0705.2659 | Theophanes Grammenos | I. Radinschi, Th. Grammenos | Moeller's Energy-Momentum Complex for a Spacetime Geometry on a
Noncommutative Curved D3-Brane | 12 pages | Int.J.Theor.Phys.47:1363-1372,2008 | 10.1007/s10773-007-9578-9 | null | gr-qc | null | Moeller's energy-momentum complex is employed in order to determine the
energy and momentum distributions for a spacetime described by a "generalized
Schwarzschild" geometry in (3+1)-dimensions on a noncommutative curved D3-brane
in an effective, open bosonic string theory. The geometry considered is
obtained by an effective theory of gravity coupled with a nonlinear
electromagnetic field and depends only on the generalized (effective) mass and
charge which incorporate corrections of first order in the noncommutativity
parameter.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 08:57:50 GMT"
},
{
"version": "v2",
"created": "Sun, 2 Sep 2007 15:50:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Radinschi",
"I.",
""
],
[
"Grammenos",
"Th.",
""
]
] |
0705.2660 | Fu-Guo Deng | Ping Zhou, Xi-Han Li, Fu-Guo Deng, and Hong-Yu Zhou | Multiparty-controlled teleportation of an arbitrary m-qudit state with
pure entangled quantum channel | 8 pages, 0 figures | J. Phys. A 40 (2007) 13121-13130 | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general scheme for multiparty-controlled teleportation of an
arbitrary m-qudit ($d$-dimensional quantum system) state by using non-maximally
entangled states as the quantum channel. The sender performs m generalized
Bell-state measurements on her 2$m$ particles, the controllers take some
single-particle measurements with the measuring basis $X_{d}$ and the receiver
only need to introduce one auxiliary two-level particle to extract quantum
information probabilistically with the fidelity unit if he cooperates with all
the controllers. All the parties can use some decoy photons to set up their
quantum channel securely, which will forbid some a dishonest party to eavesdrop
freely. This scheme is optimal as the probability that the receiver obtains the
originally unknown m-qudit state equals to the entanglement of the quantum
channel.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 09:00:42 GMT"
},
{
"version": "v2",
"created": "Tue, 9 Oct 2007 14:08:17 GMT"
},
{
"version": "v3",
"created": "Thu, 7 May 2009 13:13:44 GMT"
}
] | 2009-05-07T00:00:00 | [
[
"Zhou",
"Ping",
""
],
[
"Li",
"Xi-Han",
""
],
[
"Deng",
"Fu-Guo",
""
],
[
"Zhou",
"Hong-Yu",
""
]
] |
0705.2661 | Andras I. Stipsicz | Peter Ozsvath, Andras I. Stipsicz, Zoltan Szabo | Floer homology and singular knots | Minor revisions | null | 10.1112/jtopol/jtp015 | null | math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define Floer homology theories for oriented, singular knots in S^3 and
show that one of these theories can be defined combinatorially for planar
singular knots.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 09:24:46 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Jun 2007 22:08:19 GMT"
},
{
"version": "v3",
"created": "Wed, 6 May 2009 05:23:09 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Ozsvath",
"Peter",
""
],
[
"Stipsicz",
"Andras I.",
""
],
[
"Szabo",
"Zoltan",
""
]
] |
0705.2662 | Marc Chardin | Marc Chardin and Kamran Divaani-Aazar | A duality theorem for generalized local cohomology | 6 pages | null | null | null | math.AC math.AG | null | We prove a duality theorem for graded algebras over a field that implies
several known duality results : graded local duality, versions of Serre duality
for local cohomology and of Suzuki duality for generalized local cohomology,
and Herzog-Rahimi bigraded duality.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 09:20:16 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chardin",
"Marc",
""
],
[
"Divaani-Aazar",
"Kamran",
""
]
] |
0705.2663 | Tom\'as Alonso | R. Neri, A. Fuente, C. Ceccarelli, P. Caselli, D. Johnstone, E.F. van
Dishoeck, F. Wyrowski, M. Tafalla, B. Lefloch, R. Plume | The IC1396N proto-cluster at a scale of 250 AU | null | null | 10.1051/0004-6361:20077320 | null | astro-ph | null | We investigate the mm-morphology of IC1396N with unprecedented spatial
resolution to analyze its dust and molecular gas properties, and draw
comparisons with objects of similar mass. We have carried out sensitive
observations in the most extended configurations of the IRAM Plateau de Bure
interferometer, to map the thermal dust emission at 3.3 and 1.3mm, and the
emission from the $J$=13$_k\to12_k$ hyperfine transitions of methyl cyanide
(CH$_3$CN). We unveil the existence of a sub-cluster of hot cores in IC1396N,
distributed in a direction perpendicular to the emanating outflow. The cores
are embedded in a common envelope of extended and diffuse dust emission. We
find striking differences in the dust properties of the cores ($\beta\simeq$ 0)
and the surrounding envelope ($\beta\simeq$ 1), very likely testifying to
differences in the formation and processing of dust material. The CH$_3$CN
emission peaks towards the most massive hot core and is marginally extended in
the outflow direction.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 09:21:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Neri",
"R.",
""
],
[
"Fuente",
"A.",
""
],
[
"Ceccarelli",
"C.",
""
],
[
"Caselli",
"P.",
""
],
[
"Johnstone",
"D.",
""
],
[
"van Dishoeck",
"E. F.",
""
],
[
"Wyrowski",
"F.",
""
],
[
"Tafalla",
"M.",
""
],
[
"Lefloch",
"B.",
""
],
[
"Plume",
"R.",
""
]
] |
0705.2664 | Toshifumi Yamashita | Francesca Borzumati, Satoshi Mishima, Toshifumi Yamashita | Non-CKM induced flavor violation in "minimal" SUSY SU(5) models | 4 pages, 2 figures, presented at the Workshop ``Flavour in the era of
the LHC'', CERN, October 9-11 2006, and the ``4th International Workshop on
the CKM unitarity triangle'', Nagoya, Japan, December 12-16 2006 | null | null | null | hep-ph | null | Patterns of flavor violation induced by neutrino Yukawa couplings are
discussed in realistic ``minimal'' SUSY SU(5) models, obtained by adding
nonrenormalizable operators to the minimal one, in order to fix the fermion
spectrum and suppress proton decay. Results are presented for the three
possible implementations of the seesaw mechanisms, i.e. of Type I, II and III.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 09:33:59 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Borzumati",
"Francesca",
""
],
[
"Mishima",
"Satoshi",
""
],
[
"Yamashita",
"Toshifumi",
""
]
] |
0705.2665 | Yi-Xin Chen | Lin Chen, Yi-Xin Chen | Multiqubit entanglement witness | Revtex, 11 pages | null | 10.1103/PhysRevA.76.022330 | null | quant-ph | null | We introduce a feasible method of constructing the entanglement witness that
detects the genuine entanglement of a given pure multiqubit state. We
illustrate our method in the scenario of constructing the witnesses for the
multiqubit states that are broadly theoretically and experimentally
investigated. It is shown that our method can construct the effective witnesses
for experiments. We also investigate the entanglement detection of symmetric
states and mixed states.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 09:29:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chen",
"Lin",
""
],
[
"Chen",
"Yi-Xin",
""
]
] |
0705.2666 | Konstantin Klimenko | D. Ebert, K.G. Klimenko and V.L. Yudichev | Mass spectrum of diquarks and mesons in the color--flavor locked phase
of dense quark matter | 14 pages; references added; multiplet structure of diquark
excitations of the CFL phase is revised | Eur.Phys.J.C53:65-76,2008 | 10.1140/epjc/s10052-007-0446-9 | HU-EP-07/18 | hep-ph | null | The spectrum of meson and diquark excitations of dense quark matter is
considered in the framework of the Nambu -- Jona-Lasinio model with three types
of massless quarks in the presense of a quark number chemical potential $\mu$.
We investigate the effective action of meson- and diquark fields both at
sufficiently large values of $\mu>\mu_c\approx 330$ MeV, where the
color--flavor locked (CFL) phase is realized, and in the chirally broken phase
of quark matter ($\mu<\mu_c$). In the last case all nine pseudoscalar mesons
are Nambu -- Goldstone (NG) bosons, whereas the mass of the scalar meson nonet
is twice the dynamical quark mass. In the chirally broken phase the
pseudoscalar diquarks are not allowed to exist as stable particles, but the
scalar diquarks might be stable only at a rather strong interaction in the
diquark channel. In the case of the CFL phase, all NG bosons of the model are
realized as scalar and pseudoscalar diquarks. Moreover, it turns out that
massive diquark excitations are unstable for this phase. In particular, for the
scalar and pseudoscalar octets of diquark resonances a mass value around 230
MeV was found numerically. In contrast, mesons are stable particles in the CFL
phase. Their masses lie in the interval 400$\div$500 MeV for not too large
values of $\mu>\mu_c$.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 09:54:32 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Sep 2007 16:21:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ebert",
"D.",
""
],
[
"Klimenko",
"K. G.",
""
],
[
"Yudichev",
"V. L.",
""
]
] |
0705.2667 | Edouard Bernard | Edouard J. Bernard (for the LCID Team) | The ACS LCID Project: Variable Stars in Tucana and LGS3 | 2 pages, 1 figure. To appear in the Proceedings of IAU Symposium 241:
"Stellar Populations as Building Blocks of Galaxies", 10-16 December, 2006 at
La Palma, Canary Islands, Spain | null | 10.1017/S1743921307008241 | null | astro-ph | null | We present preliminary results concerning the search for short-period
variable stars in Tucana and LGS3 based on very deep HST/ACS imaging. In the
one chip per galaxy we studied so far, a total of 230 and 80 candidates
variables were found, respectively. For Tucana, we identified 134 of them as RR
Lyrae stars (RRL) pulsating in the fundamental mode (RRab), 51 in the
first-overtone mode (RRc), and 37 in both modes simultaneoulsy (RRd), as well
as four candidate anomalous Cepheids (AC). In the case of LGS3, we found 45
RRab and 5 RRc, plus three candidates RRd and five candidate AC. The
metallicities obtained from the mean period of the RRab are [Fe/H]_{Tuc}=-1.7
and [Fe/H]_{LGS3}=-1.8.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 10:12:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bernard",
"Edouard J.",
"",
"for the LCID Team"
]
] |
0705.2668 | Daria Fleurov | Daria Fleurov and Eli Eisenberg | Super-Poissonian Shot Noise as a Measure of Dephasing in Closed Quantum
Dots | 5 pages 4 figures, submitted to prb | Phys. Rev. B 76, 195330 (2007) | null | null | cond-mat.mes-hall | null | Electron-electron interactions play a major role in determining the
low-temperature rate of phase loss of electrons in mesoscopic systems. The
study of the dephasing rate is expected to contribute to the understanding of
the many-body nature of such systems. Closed quantum dots are of special
interest in this respect, due to theoretical predictions suggesting a possible
transition temperature below which the dephasing rate vanishes. This prediction
has attracted much attention, since closed quantum dots are prime candidates
for storage units in quantum computers, and thus their phase coherence
properties are of great importance. However, an effective method for measuring
the dephasing rate within a closed quantum dot is still lacking. Here we study
two-level systems and show that the Fano factor has a sharp peak as a function
of the chemical potential, the location of which can be simply related to the
dephasing rate. We thus suggest to use the properties of the Fano factor peak
in the super-Poissonian regime as a probe for the dephasing rate.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 10:49:38 GMT"
}
] | 2010-08-26T00:00:00 | [
[
"Fleurov",
"Daria",
""
],
[
"Eisenberg",
"Eli",
""
]
] |
0705.2669 | Alfredo Alexander-Katz | A. Alexander-Katz | Motion-reversal in a simple microscopic swimmer | 5 pages, 4 figures | null | null | null | cond-mat.soft | null | We study the motion of a microscopic swimmer composed of a semiflexible
polymer anchored at the surface of a magnetic sphere using hydrodynamic
simulations and scaling arguments. The swimmer is driven by a rotating magnetic
field, and displays forward and backward motion depending on the value of the
rotational frequency. In particular, the system exhibits forward thrust for
frequencies below a critical frequency $\omega^*$, while above $\omega^*$ the
motion is reversed.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 10:43:03 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Alexander-Katz",
"A.",
""
]
] |
0705.2670 | Cristiano De Michele | C. De Michele, R. Schilling, F. Sciortino | Dynamics of uniaxial hard ellipsoids | accepted by Phys. Rev. Lett | Phys. Rev. Lett. 98, 265702 (2007) | 10.1103/PhysRevLett.98.265702 | null | cond-mat.soft | null | We study the dynamics of monodisperse hard ellipsoids via a new event-driven
molecular dynamics algorithm as a function of volume fraction $\phi$ and aspect
ratio $X_0$. We evaluate the translational $D_{trans}$ and the rotational
$D_{rot}$ diffusion coefficient and the associated isodiffusivity lines in the
$\phi-X_0$ plane. We observe a decoupling of the translational and rotational
dynamics which generates an almost perpendicular crossing of the $D_{trans}$
and $D_{rot}$ isodiffusivity lines. While the self intermediate scattering
function exhibits stretched relaxation, i.e. glassy dynamics, only for large
$\phi$ and $X_0 \approx 1$, the second order orientational correlator $C_2(t)$
shows stretching only for large and small $X_0$ values. We discuss these
findings in the context of a possible pre-nematic order driven glass
transition.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 10:55:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"De Michele",
"C.",
""
],
[
"Schilling",
"R.",
""
],
[
"Sciortino",
"F.",
""
]
] |
0705.2671 | Boyka Aneva | Boyka Aneva | Hidden Symmetries of Stochastic Models | This is a contribution to the Proc. of the O'Raifeartaigh Symposium
on Non-Perturbative and Symmetry Methods in Field Theory (June 2006,
Budapest, Hungary), published in SIGMA (Symmetry, Integrability and Geometry:
Methods and Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 3 (2007), 068, 12 pages | 10.3842/SIGMA.2007.068 | null | cond-mat.stat-mech math-ph math.MP math.QA | null | In the matrix product states approach to $n$ species diffusion processes the
stationary probability distribution is expressed as a matrix product state with
respect to a quadratic algebra determined by the dynamics of the process. The
quadratic algebra defines a noncommutative space with a $SU_q(n)$ quantum group
action as its symmetry. Boundary processes amount to the appearance of
parameter dependent linear terms in the algebraic relations and lead to a
reduction of the $SU_q(n)$ symmetry. We argue that the boundary operators of
the asymmetric simple exclusion process generate a tridiagonal algebra whose
irriducible representations are expressed in terms of the Askey-Wilson
polynomials. The Askey-Wilson algebra arises as a symmetry of the boundary
problem and allows to solve the model exactly.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 10:54:35 GMT"
}
] | 2008-04-24T00:00:00 | [
[
"Aneva",
"Boyka",
""
]
] |
0705.2672 | Roland Speith | C. Sch\"afer, R. Speith, W. Kley (University of T\"ubingen) | Collisions between equal sized ice grain agglomerates | 7 pages, 11 figures, accepted by A&A | A&A 470, 733-739 (2007) | 10.1051/0004-6361:20077354 | null | astro-ph | null | Following the recent insight in the material structure of comets,
protoplanetesimals are assumed to have low densities and to be highly porous
agglomerates. It is still unclear if planetesimals can be formed from these
objects by collisional growth. Therefore, it is important to study numerically
the collisional outcome from low velocity impacts of equal sized porous
agglomerates which are too large to be examined in a laboratory experiment. We
use the Lagrangian particle method Smooth Particle Hydrodynamics to solve the
equations that describe the dynamics of elastic and plastic bodies.
Additionally, to account for the influence of porosity, we follow a previous
developed equation of state and certain relations between the material strength
and the relative density. Collisional growth seems possible for rather low
collision velocities and particular material strengths. The remnants of
collisions with impact parameters that are larger than 50% of the radius of the
colliding objects tend to rotate. For small impact parameters, the colliding
objects are effectively slowed down without a prominent compaction of the
porous structure, which probably increases the possibility for growth. The
protoplanetesimals, however, do not stick together for the most part of the
employed material strengths. An important issue in subsequent studies has to be
the influence of rotation to collisional growth. Moreover, for realistic
simulations of protoplanetesimals it is crucial to know the correct material
parameters in more detail.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 10:56:01 GMT"
}
] | 2007-07-30T00:00:00 | [
[
"Schäfer",
"C.",
"",
"University of Tübingen"
],
[
"Speith",
"R.",
"",
"University of Tübingen"
],
[
"Kley",
"W.",
"",
"University of Tübingen"
]
] |
0705.2673 | Dragos Falie | Dragos Falie, Vasile Buzuloiu | Noise characteristics of 3D time-of-flight cameras | null | ISSCS, 2007, Iasi | null | null | physics.data-an | null | Time-of-flight (TOF) cameras are based on a new technology that delivers
distance maps by the use of a modulated light source. In this paper we first
describe a set of experiments that we performed with TOF cameras. We then
propose a noise model which is able to explain some of the phenomena observed
in the experiments. The model is based on assuming a noise source that is
correlated with the light source (shot noise) and an additional additive noise
source (dark current noise). The model predicts well the dependency of the
distance errors on the image intensity and the true distance at an individual
pixel.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 11:08:23 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Falie",
"Dragos",
""
],
[
"Buzuloiu",
"Vasile",
""
]
] |
0705.2674 | Claire Noel CN | C. Noel, Y. Busegnies, M. V. Papalexandris, V. Deledicque, A. El
Messoudi | Hydrodynamical simulation of detonations in superbursts. I. The
hydrodynamical algorithm and some preliminary one-dimensional results | 7 pages, 7 figures, Astronomy and Astrophysics in press, a version of
the paper with higher figures resolution can be found on
http://www.astro.ulb.ac.be/Html/ps.html#Hydro | Comput.Phys.Commun.179:190-193,2008 | 10.1016/j.cpc.2008.01.034 | null | astro-ph | null | Aims. This work presents a new hydrodynamical algorithm to study
astrophysical detonations. A prime motivation of this development is the
description of a carbon detonation in conditions relevant to superbursts, which
are thought to result from the propagation of a detonation front around the
surface of a neutron star in the carbon layer underlying the atmosphere.
Methods. The algorithm we have developed is a finite-volume method inspired by
the original MUSCL scheme of van Leer (1979). The algorithm is of second-order
in the smooth part of the flow and avoids dimensional splitting. It is applied
to some test cases, and the time-dependent results are compared to the
corresponding steady state solution. Results. Our algorithm proves to be robust
to test cases, and is considered to be reliably applicable to astrophysical
detonations. The preliminary one-dimensional calculations we have performed
demonstrate that the carbon detonation at the surface of a neutron star is a
multiscale phenomenon. The length scale of liberation of energy is $10^6$ times
smaller than the total reaction length. We show that a multi-resolution
approach can be used to solve all the reaction lengths. This result will be
very useful in future multi-dimensional simulations. We present also
thermodynamical and composition profiles after the passage of a detonation in a
pure carbon or mixed carbon-iron layer, in thermodynamical conditions relevant
to superbursts in pure helium accretor systems.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 13:37:57 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Noel",
"C.",
""
],
[
"Busegnies",
"Y.",
""
],
[
"Papalexandris",
"M. V.",
""
],
[
"Deledicque",
"V.",
""
],
[
"Messoudi",
"A. El",
""
]
] |
0705.2675 | Harald Dimmelmeier | Harald Dimmelmeier, Christian D. Ott, Hans-Thomas Janka, Andreas
Marek, Ewald Mueller | Generic Gravitational Wave Signals from the Collapse of Rotating Stellar
Cores: A Detailed Analysis | 10 pages, 9 figures, to appear in the Proceedings of the XLII
Rencontres de Moriond, "Gravitational Waves and Experimental Gravity", La
Thuile, Italy, 2007 | null | null | null | astro-ph | null | We present detailed results from performing general relativistic (GR)
simulations of stellar core collapse to a proto-neutron star, using a
microphysical equation of state (EoS) as well as an approximate description of
deleptonization during the collapse phase. We show that for a wide variety of
rotation rates and profiles the gravitational wave (GW) burst signals from the
core bounce are of a generic type, already known as Type I in the literature.
In addition, for most models the characteristic frequency of the GW burst
signal lies in a narrow range around approximately 718 Hz. In our systematic
study, using both GR and Newtonian gravity, we identify, individually quantify,
and discuss in detail the micro- and macrophysical mechanisms leading to this
result, i.e. the effects of rotation, the EoS, and deleptonization. We also
discuss the detectability prospects of such GW burst signals by GW detectors,
and infer that such a generic type of signal templates will likely facilitate a
more efficient search in current and future detectors of both interferometric
and resonant type.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 11:25:43 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Dimmelmeier",
"Harald",
""
],
[
"Ott",
"Christian D.",
""
],
[
"Janka",
"Hans-Thomas",
""
],
[
"Marek",
"Andreas",
""
],
[
"Mueller",
"Ewald",
""
]
] |
0705.2676 | Hongguang Zhang | Hong-Guang Zhang, Jie Ren, Xin-He Meng | Observe the open universe in the sky? | This paper has been withdrawn | null | null | null | hep-th | null | We first review the related works on the observable consequence of landscape
and the regulation of e-foldings during inflation. We focus on a branch of
observable consequence of landscape which predicts an open universe with
negative curvature if e-foldings $N>62$. After discussing the observable
regulation from the aspect by Kaloper, Kleban and Sorbo, we make an argument
that in the non-flat background the observable $N$ is suppressed by a factor
$k/\rho_{0}$. We point out that this seems to detect the information where
e-foldings $N>62$ possibly. Finally, we discuss our outcomes with the recent
work by Arkani-Hamed et al.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 11:20:27 GMT"
},
{
"version": "v2",
"created": "Sun, 27 Jun 2010 22:20:23 GMT"
}
] | 2010-06-29T00:00:00 | [
[
"Zhang",
"Hong-Guang",
""
],
[
"Ren",
"Jie",
""
],
[
"Meng",
"Xin-He",
""
]
] |
0705.2677 | Youri Davydov | Davydov Youri and Rotar Vladimir | On Asymptotic Proximity of Distributions | 21 pages, added reference, adapted content, corrected typos | null | null | null | math.PR | null | We consider some general facts concerning convergence P_{n}-Q_{n}\to 0 as
n\to \infty, where P_{n} and Q_{n} are probability measures in a complete
separable metric space. The main point is that the sequences {P_{n}} and
{Q_{n}} are not assumed to be tight. We compare different possible definitions
of the above convergence, and establish some general properties.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 11:22:03 GMT"
},
{
"version": "v2",
"created": "Sat, 30 Jun 2007 09:25:40 GMT"
}
] | 2007-06-30T00:00:00 | [
[
"Youri",
"Davydov",
""
],
[
"Vladimir",
"Rotar",
""
]
] |
0705.2678 | Nario Kuno | N. Kuno, N. Sato, H. Nakanishi, A. Hirota, T. Tosaki, Y. Shioya, K.
Sorai, N. Nakai, K. Nishiyama, B. Vila-Vilaro | Nobeyama CO Atlas of Nearby Spiral Galaxies: Distribution of Molecular
Gas in Barred and Non-barred Spiral Galaxies | 15 pages, 50 figures, 3 tables | Publ.Astron.Soc.Jap.59:117-166,2007 | 10.1093/pasj/59.1.117 | null | astro-ph | null | The data from a CO(1 - 0) mapping survey of 40 nearby spiral galaxies
performed with the Nobeyama 45-m telescope are presented. The criteria of the
sample selection were (1) RC3 morphological type in the range Sa to Scd, (2)
distance less than 25 Mpc, (3) inclination angle less than 79deg (RC3), (4)
flux at 100 um higher than ~ 10 Jy, (5) spiral structure is not destroyed by
interaction. The maps of CO cover most of the optical disk of the galaxies. We
investigated the influence of bar on the distribution of molecular gas in
spiral galaxies using these data. We confirmed that the degree of central
concentration is higher in barred spirals than in non-barred spirals as shown
by the previous works. Furthermore, we present an observational evidence that
bars are efficient in driving molecular gas that lies within the bar length
toward the center, while the role in bringing gas in from the outer parts of
the disks is small. The transported gas accounts for about half of molecular
gas within the central region in barred spiral galaxies. We found a correlation
between the degree of central concentration and bar strength. Galaxies with
stronger bars tend to have higher central concentration. The correlation
implies that stronger bars accumulate molecular gas toward the center more
efficiently. These results are consistent with long-lived bars.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 11:22:33 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Kuno",
"N.",
""
],
[
"Sato",
"N.",
""
],
[
"Nakanishi",
"H.",
""
],
[
"Hirota",
"A.",
""
],
[
"Tosaki",
"T.",
""
],
[
"Shioya",
"Y.",
""
],
[
"Sorai",
"K.",
""
],
[
"Nakai",
"N.",
""
],
[
"Nishiyama",
"K.",
""
],
[
"Vila-Vilaro",
"B.",
""
]
] |
0705.2679 | Marcella Di Criscienzo | M. Di Criscienzo, F. Caputo, M. Marconi, S. Cassisi | Synthetic properties of bright metal-poor variables. II. BL Her stars | 12 pages, 6 figures, 6 tables, accepted for publication in A&A on
date 16/05/2007 | null | 10.1051/0004-6361:20066541 | null | astro-ph | null | We investigate the properties of the so-called BL Her stars, i.e., Population
II Cepheids with periods shorter than 8 days, using updated pulsation models
and evolutionary tracks computed adopting a metal abundance in the range of
Z=0.0001 to Z=0.004. We derive the predicted Period-Magnitude (PM) and
Period-Wesenheit (PW) relations at the various photometric bands and we show
that the slopes of these relations are in good agreement with the slopes
determined by observed variables in Galactic globular clusters, independently
of the adopted M_V(RR)-[Fe/H] relation to get the cluster RR Lyrae-based
distance. Moreover, we show that also the distances provided by the predicted
PM and PW relations for BL Her stars agree within the errors with the RR Lyrae
based values. The use of the predicted relations with W Vir stars, which are
Population II Cepheids with periods longer than 8 days, provides no clear
evidence for or against a change in the PM and PW slopes around P~10 days.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 11:37:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Di Criscienzo",
"M.",
""
],
[
"Caputo",
"F.",
""
],
[
"Marconi",
"M.",
""
],
[
"Cassisi",
"S.",
""
]
] |
0705.2680 | Parthasarathi Mitra | P. Mitra | Complex fermion mass term, regularization and CP violation | REVTeX, 4 pages | J.Phys.A40:F525-F530,2007 | 10.1088/1751-8113/40/26/F03 | null | hep-th hep-ph | null | It is well known that the CP violating theta term of QCD can be converted to
a phase in the quark mass term. However, a theory with a complex mass term for
quarks can be regularized so as not to violate CP, for example through a zeta
function. The contradiction is resolved through the recognition of a dependence
on the regularization or measure. The appropriate choice of regularization is
discussed and implications for the strong CP problem are pointed out.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 11:48:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mitra",
"P.",
""
]
] |
0705.2681 | Alexander Razumov | Kh. S. Nirov, A. V. Razumov | On Z-graded loop Lie algebras, loop groups, and Toda equations | 24 pages, talk given at the Workshop "Classical and Quantum
Integrable Systems" (Dubna, January, 2007) | Theor.Math.Phys.154:385-404,2008 | 10.1007/s11232-008-0034-7 | null | math-ph hep-th math.MP nlin.SI | null | Toda equations associated with twisted loop groups are considered. Such
equations are specified by Z-gradations of the corresponding twisted loop Lie
algebras. The classification of Toda equations related to twisted loop Lie
algebras with integrable Z-gradations is discussed.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 11:50:03 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nirov",
"Kh. S.",
""
],
[
"Razumov",
"A. V.",
""
]
] |
0705.2682 | Suvankar Dutta | Nabamita Banerjee and Suvankar Dutta | Phase Transition of Electrically Charged Ricci-flat Black Holes | 33 pages, 9 figures, Version 2, References added | JHEP0707:047,2007 | 10.1088/1126-6708/2007/07/047 | null | hep-th | null | We study phase transition between electrically charged Ricci-flat black holes
and AdS soliton spacetime of Horowitz and Myers in five dimensions. Boundary
topology for both of them is $S^1 \times S^1 \times R^2$. We consider
Reissner-Nordstrom black hole and R-charged black holes and find that phase
transition of these black holes to AdS soliton spacetime depends on the
relative size of two boundary circles. We also perform the stability analysis
for these black holes. In order to use the AdS/CFT correspondence, we work in
the grand canonical ensemble.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 11:56:05 GMT"
},
{
"version": "v2",
"created": "Thu, 31 May 2007 20:24:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Banerjee",
"Nabamita",
""
],
[
"Dutta",
"Suvankar",
""
]
] |
0705.2683 | Tuomas Multam\"aki | K. Henttunen, T. Multamaki, I. Vilja | Stellar configurations in f(R) theories of gravity | 8 pages, 7 figures; typos corrected, reference added | Phys.Rev.D77:024040,2008 | 10.1103/PhysRevD.77.024040 | null | astro-ph gr-qc | null | We study stellar configurations and the space-time around them in metric
$f(R)$ theories of gravity. In particular, we focus on the polytropic model of
the Sun in the $f(R)=R-\mu^4/R$ model. We show how the stellar configuration in
the $f(R)$ theory can, by appropriate initial conditions, be selected to be
equal to that described by the Lane-Emden -equation and how a simple scaling
relation exists between the solutions. We also derive the correct solution
analytically near the center of the star in $f(R)$ theory. Previous analytical
and numerical results are confirmed, indicating that the space-time around the
Sun is incompatible with Solar System constraints on the properties of gravity.
Numerical work shows that stellar configurations, with a regular metric at the
center, lead to $\gamma_{PPN}\simeq1/2$ outside the star ie. the
Schwarzschild-de Sitter -space-time is not the correct vacuum solution for such
configurations. Conversely, by selecting the Schwarzschild-de Sitter -metric as
the outside solution, we find that the stellar configuration is unchanged but
the metric is irregular at the center. The possibility of constructing a $f(R)$
theory compatible with the Solar System experiments and possible new
constraints arising from the radius-mass -relation of stellar objects is
discussed.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 11:56:20 GMT"
},
{
"version": "v2",
"created": "Mon, 28 May 2007 12:46:18 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Henttunen",
"K.",
""
],
[
"Multamaki",
"T.",
""
],
[
"Vilja",
"I.",
""
]
] |
0705.2684 | Manuela Capello | Manuela Capello, Federico Becca, Michele Fabrizio, Sandro Sorella | Superfluid to Mott-insulator transition in Bose-Hubbard models | 4 pages, 4 figures, based on cond-mat/0611306 | null | 10.1103/PhysRevLett.99.056402 | null | cond-mat.str-el | null | We study the superfluid-insulator transition in Bose-Hubbard models in one-,
two-, and three-dimensional cubic lattices by means of a recently proposed
variational wave function. In one dimension, the variational results agree with
the expected Berezinskii-Kosterlitz-Thouless scenario of the interaction-driven
Mott transition. In two and three dimensions, we find evidences that, across
the transition,most of the spectral weight is concentrated at high energies,
suggestive of pre-formed Mott-Hubbard side-bands. This result is compatible
with the experimental data by Stoferle et al.
[Phys. Rev. Lett. 92, 130403 (2004)].
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 12:09:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Capello",
"Manuela",
""
],
[
"Becca",
"Federico",
""
],
[
"Fabrizio",
"Michele",
""
],
[
"Sorella",
"Sandro",
""
]
] |
0705.2685 | Anne Moreau | Jean-Yves Charbonnel (IMJ), Anne Moreau (LMA-Poitiers) | Nilpotent bicone and characteristic submodule of a reductive Lie algebra | 48 pages. Remark 8 has been modified; one sentence was not correct.
We thank Kari Vilonen for pointing out this error | null | null | null | math.RT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nilpotent bicone of a finite dimensional complex reductive Lie algebra g
is the subset of elements in g x g whose subspace generated by the components
is contained in the nilpotent cone of g. The main result of this note is that
the nilpotent bicone is a complete intersection. This affirmatively answers a
conjecture of Kraft-Wallach concerning the nullcone. In addition, we introduce
and study the characteristic submodule of g. The properties of the nilpotent
bicone and the characteristic submodule are known to be very important for the
understanding of the commuting variety and its ideal of definition. In order to
study the nilpotent bicone, we introduce another subvariety, the principal
bicone. The nilpotent bicone, as well as the principal bicone, are linked to
jet schemes. We study their dimensions using arguments from motivic
integration. Namely, we follow methods developed in
http://arxiv.org/abs/math/0008002v5 .
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 12:11:31 GMT"
},
{
"version": "v2",
"created": "Sun, 20 Jan 2008 09:26:12 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Feb 2008 09:19:05 GMT"
},
{
"version": "v4",
"created": "Tue, 12 Aug 2008 16:09:58 GMT"
},
{
"version": "v5",
"created": "Tue, 16 Dec 2014 07:12:48 GMT"
}
] | 2014-12-17T00:00:00 | [
[
"Charbonnel",
"Jean-Yves",
"",
"IMJ"
],
[
"Moreau",
"Anne",
"",
"LMA-Poitiers"
]
] |
0705.2686 | John Greenlees | J.P.C.Greenlees | Rational torus-equivariant homotopy I: calculating groups of stable maps | null | null | null | null | math.AT | null | We construct an abelian category A(G) of sheaves over a category of closed
subgroups of the r-torus G and show it is of finite injective dimension. It can
be used as a model for rational $G$-spectra in the sense that there is a
homology theory
\piA_*: G-spectra/Q --> A(G) on rational G-spectra with values in A(G), and
the associated Adams spectral sequence converges for all rational $G$-spectra
and collapses at a finite stage.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 12:14:23 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Greenlees",
"J. P. C.",
""
]
] |
0705.2687 | John Greenlees | Matthew Ando and J.P.C. Greenlees | Circle-equivariant classifying spaces and the rational equivariant sigma
genus | The new version includes further notational improvements. The main
results and methods of proof are unchanged. No further changes are expected | null | null | null | math.AT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The circle-equivariant spectrum MString_C is the equivariant analogue of the
cobordism spectrum MU<6> of stably almost complex manifolds with c_1=c_2=0.
Given a rational elliptic curve C, the second author has defined a ring
T-spectrum EC representing the associated T-equivariant elliptic cohomology.
The core of the present paper is the construction, when C is a complex elliptic
curve, of a map of ring T-spectra
MString_C --> EC which is the rational equivariant analogue of the sigma
orientation of Ando-Hopkins-Strickland. We support this by a theory of
characteristic classes for calculation, and a conceptual description in terms
of algebraic geometry. In particular, we prove a conjecture of the first
author.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 12:29:02 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Jul 2009 10:51:53 GMT"
},
{
"version": "v3",
"created": "Thu, 22 Jul 2010 17:34:02 GMT"
}
] | 2010-07-23T00:00:00 | [
[
"Ando",
"Matthew",
""
],
[
"Greenlees",
"J. P. C.",
""
]
] |
0705.2688 | Andrea Puglisi | A. Puglisi, A. Baldassarri and A. Vulpiani | Violation of the Einstein relation in Granular Fluids: the role of
correlations | 18 pages, 6 figures, submitted for publication | J. Stat. Mech. (2007) P08016 | 10.1088/1742-5468/2007/08/P08016 | null | cond-mat.stat-mech cond-mat.soft | null | We study the linear response in different models of driven granular gases. In
some situations, even if the the velocity statistics can be strongly
non-Gaussian, we do not observe appreciable violations of the Einstein formula
for diffusion versus mobility. The situation changes when strong correlations
between velocities and density are present: in this case, although a form of
fluctuation-dissipation relation holds, the differential velocity response of a
particle and its velocity self-correlation are no more proportional. This
happens at high densities and strong inelasticities, but still in the
fluid-like (and ergodic) regime.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 12:39:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Puglisi",
"A.",
""
],
[
"Baldassarri",
"A.",
""
],
[
"Vulpiani",
"A.",
""
]
] |
0705.2689 | Janvier Nzeutchap | Janvier Nzeutchap | Binary Search Tree insertion, the Hypoplactic insertion, and Dual Graded
Graphs | 11 pages, submitted to the Electronic Journal of Combinatorics on
February 2007 | null | null | null | math.CO | null | Fomin (1994) introduced a notion of duality between two graded graphs on the
same set of vertices. He also introduced a generalization to dual graded graphs
of the classical Robinson-Schensted-Knuth algorithm. We show how Fomin's
approach applies to the binary search tree insertion algorithm also known as
sylvester insertion, and to the hypoplactic insertion algorithm.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 12:41:32 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Nzeutchap",
"Janvier",
""
]
] |
0705.2690 | V. Ravishankar | Vinod Chandra, Ravindra Kumar and V. Ravishankar | Hot QCD equations of state and relativistic heavy ion collisions | 11 pages, fifteen figures, two column, accepted for publication in
PRC | Phys.Rev.C76:054909,2007; Erratum-ibid.C76:069904,2007 | 10.1103/PhysRevC.76.054909 10.1103/PhysRevC.76.069904 | null | nucl-th hep-ph hep-th | null | We study two recently proposed equations of state (EOS) which are obtained
from high temperature QCD, and show how they can be adapted to use them for
making predictions for relativistic heavy ion collisions. The method involves
extracting equilibrium distribution functions for quarks and gluons from the
EOS, which in turn will allow a determination of the transport and other bulk
properties of the quark gluon plasma. Simultaneously, the method also yields a
quasi particle description of interacting quarks and gluons. The first EOS is
perturbative in the QCD coupling constant and has contributions of $O(g^5)$.
The second EOS is an improvement over the first, with contributions upto $
O(g^6 ln(\frac{1}{g}))$; it incorporates the nonperturbative hard thermal
contributions. The interaction effects are shown to be captured entirely by the
effective chemical potentials for the gluons and the quarks, in both the cases.
The chemical potential is seen to be highly sensitive to the EOS. As an
application, we determine the screening lengths which are, indeed the most
important diagnostics for QGP. The screening lengths are seen to behave
drastically differently depending on the EOS considered., and yield, therefore,
a way to distinguish the two equations of state in heavy ion collisions.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 12:50:09 GMT"
},
{
"version": "v2",
"created": "Sun, 20 May 2007 10:12:17 GMT"
},
{
"version": "v3",
"created": "Thu, 22 Nov 2007 12:21:42 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Chandra",
"Vinod",
""
],
[
"Kumar",
"Ravindra",
""
],
[
"Ravishankar",
"V.",
""
]
] |
0705.2691 | Eric Vasserot | M. Varagnolo, E. Vasserot | Finite dimensional representations of DAHA and affine Springers fibers :
the spherical case | 79 pages. Corrected typos | null | null | null | math.RT | null | We classify finite dimensional simple spherical representations of rational
double affine Hecke algebras, and we study a remarkable family of finite
dimensional simple spherical representations of double affine Hecke algebras.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 12:51:16 GMT"
},
{
"version": "v2",
"created": "Fri, 25 May 2007 11:01:45 GMT"
},
{
"version": "v3",
"created": "Tue, 3 Jul 2007 14:07:14 GMT"
}
] | 2007-07-03T00:00:00 | [
[
"Varagnolo",
"M.",
""
],
[
"Vasserot",
"E.",
""
]
] |
0705.2692 | Mario Novello | M. Novello | Constructing Dirac linear fermions in terms of non-linear Heisenberg
spinors | null | Europhys.Lett.80:41001,2007 | 10.1209/0295-5075/80/41001 | null | astro-ph hep-th | null | We show that the massive (or massless) neutrinos can be described as special
states of Heisenberg nonlinear spinors. As a by-product of this decomposition a
particularly attractive consequence appears: the possibility of relating the
existence of only three species of mass-less neutrinos to such internal
non-linear structure. At the same time it allows the possibility that neutrino
oscillation can occurs even for massless neutrinos.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 12:53:49 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Novello",
"M.",
""
]
] |
0705.2693 | Jonay I. Gonzalez Hernandez | J. I. Gonzalez Hernandez, R. Rebolo, G. Israelian | The Black Hole Binary Nova Scorpii 1994 (GRO J1655-40): An improved
chemical analysis | New Accepted version for publication in Astronomy and Astrophysics
Table 2: Corrected | null | 10.1051/0004-6361:20077141 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The chemical analysis of secondary stars of low mass X-ray binaries provides
an opportunity to study the formation processes of compact objects, either
black holes or neutron stars. Following the discovery of overabundances of
$\alpha$-elements in the HIRES/Keck spectrum of the secondary star of Nova
Scorpii 1994 (Israelian et al. 1999), we obtained UVES/VLT high-resolution
spectroscopy with the aim of performing a detailed abundance analysis of this
secondary star. Using a $\chi2$-minimization procedure and a grid of synthetic
spectra, we derive the stellar parameters and atmospheric abundances of O, Mg,
Al, Ca, Ti, Fe and Ni, using a new UVES spectrum and the HIRES spectrum.The
abundances of Al, Ca, Ti, Fe and Ni seem to be consistent with solar values,
whereas Na, and especially O, Mg, Si and S are significantly enhanced in
comparison with Galactic trends of these elements. A comparison with
spherically and non-spherically symmetric supernova explosion models may
provide stringent constraints to the model parameters as mass-cut and the
explosion energy, in particular from the relative abundances of Si, S, Ca, Ti,
Fe and Ni. Most probably the black hole in this system formed in a hypernova
explosion of a 30--35 \Msun progenitor star with a mass-cut in the range 2--3.5
\Msun. However, these models produce abundances of Al and Na almost ten times
higher than the observed values.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 12:53:59 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Dec 2007 11:50:40 GMT"
},
{
"version": "v3",
"created": "Tue, 10 Mar 2009 10:14:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hernandez",
"J. I. Gonzalez",
""
],
[
"Rebolo",
"R.",
""
],
[
"Israelian",
"G.",
""
]
] |
0705.2694 | Zhang Jiang | Zhang Jiang, Qing Chen, Shaolong Wan | Optimal 1->M universal quantum cloning via spin networks | 4 pages, 2 figures | PHYSICAL REVIEW A 76, 034302 (2007) | 10.1103/PhysRevA.76.034302 | null | quant-ph | null | We present a scheme that transform 1 qubit to M identical copies with optimal
fidedelity via free dynamical evolution of spin star networks. We show that the
Heisenberg XXZ coupling can fulfill the challenge. The initial state of the
copying machine and the parameters of the spin Hamiltonian are discussed in
detail. Furthermore we have proposed a feasible method to prepare the initial
state of the copying machine.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 12:58:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jiang",
"Zhang",
""
],
[
"Chen",
"Qing",
""
],
[
"Wan",
"Shaolong",
""
]
] |
0705.2695 | Alessandro Melchiorri dr. | Alessandro Melchiorri, Olga Mena, Anze Slosar | An improved cosmological bound on the thermal axion mass | 5 Pages, 3 Figures | Phys.Rev.D76:041303,2007 | 10.1103/PhysRevD.76.041303 | null | astro-ph gr-qc hep-ph | null | Relic thermal axions could play the role of an extra hot dark matter
component in cosmological structure formation theories. By combining the most
recent observational data we improve previous cosmological bounds on the axion
mass m_a in the so-called hadronic axion window. We obtain a limit on the axion
mass m_a < 0.42eV at the 95% c.l. (m_a < 0.72eV at the 99% c.l.). A novel
aspect of the analysis presented here is the inclusion of massive neutrinos and
how they may affect the bound on the axion mass. If neutrino masses belong to
an inverted hierarchy scheme, for example, the above constraint is improved to
m_a < 0.38eV at the 95% c.l. (m_a < 0.67eV at the 99% c.l.). Future data from
experiments as CAST will provide a direct test of the cosmological bound.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 13:23:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Melchiorri",
"Alessandro",
""
],
[
"Mena",
"Olga",
""
],
[
"Slosar",
"Anze",
""
]
] |
0705.2696 | Gavin Salam | Gavin P. Salam | A Practical Seedless Infrared Safe Cone Algorithm | 4 pages, 4 figures. Talk presented at the XLII Rencontres de Moriond,
QCD and Hadronic Interactions, La Thuile, March 2007 | null | null | null | hep-ph | null | This writeup highlights the infrared unsafety of the "midpoint" cone
jet-algorithm and provides a brief overview of why this is a serious issue. It
then shows how one can build a safe (seedless) cone algorithm and discusses the
potential impact on measurements.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 13:14:44 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Salam",
"Gavin P.",
""
]
] |
0705.2697 | A. S. Alexandrov | A. S. Alexandrov | Unconventional superconducting pairing by conventional phonons | 4 pages, 4 figures, more references added | Phys. Rev. B 77, 094502 (2008) | 10.1103/PhysRevB.77.094502 | null | cond-mat.supr-con cond-mat.str-el | null | The common wisdom that the phonon mechanism of electron pairing in the
weak-coupling Bardeen-Cooper-Schrieffer (BCS) superconductors leads to
conventional s-wave Cooper pairs is revised. An inevitable anisotropy of sound
velocity in crystals makes the phonon-mediated attraction of electrons
non-local in space providing unconventional Cooper pairs with a nonzero orbital
momentum in a wide range of electron densities. As a result of this anisotropy
quasi-two dimensional charge carriers undergo a quantum phase transition from
an unconventional d-wave superconducting state to a conventional s-wave
superconductor with more carriers per unit cell. In the opposite
strong-coupling regime rotational symmetry breaking appears as a result of a
reduced Coulomb repulsion between unconventional bipolarons dismissing thereby
some constraints on unconventional pairing in the Bose-Einstein condensation
(BEC) limit. The conventional phonons, and not superexchange, are shown to be
responsible for the d-wave symmetry of cuprate superconductors, where the
on-site Coulomb repulsion is large.
| [
{
"version": "v1",
"created": "Fri, 18 May 2007 13:10:32 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 16:03:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alexandrov",
"A. S.",
""
]
] |
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