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801.3573 | Jean-Jacques Sinou | Sylvain Lignon (LTDS), Jean-Jacques Sinou (LTDS), Louis Jezequel
(LTDS) | Stability analysis and \mu-synthesis control of brake systems | null | Journal of Sound and Vibration 298, 4-5 (2006) 1073-1087 | 10.1016/j.jsv.2006.06.033 | null | physics.class-ph math.DS | null | The concept of friction-induced brake vibrations, commonly known as judder,
is investigated. Judder vibration is based on the class of geometrically
induced or kinematic constraint instability. After presenting the modal
coupling mechanism and the associated dynamic model, a stability analysis as
well as a sensitivity analysis have been conducted in order to identify
physical parameters for a brake design avoiding friction-induced judder
instability. Next, in order to reduce the size of the instability regions in
relation to possible system parameter combinations, robust stability via
\mu-synthesis is applied. By comparing the unstable regions between the initial
and controlled brake system, some general indications emerge and it appears
that robust stability via \mu-synthesis has some effect on the instability of
the brake system.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 13:26:18 GMT"
}
] | 2012-09-28T00:00:00 | [
[
"Lignon",
"Sylvain",
"",
"LTDS"
],
[
"Sinou",
"Jean-Jacques",
"",
"LTDS"
],
[
"Jezequel",
"Louis",
"",
"LTDS"
]
] | [
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] |
801.3574 | Alexios Beveratos | Matthieu Larqu\'e (LPN), Isabelle Robert-Philip (LPN), Alexios
Beveratos (LPN) | Bell inequalities and density matrix for polarization entangled photons
out of a two-photon cascade in a single quantum dot | Accepted Phys. Rev. A | null | 10.1103/PhysRevA.77.042118 | null | physics.optics quant-ph | null | We theoretically investigate the joint photodetection probabilities of the
biexciton-exciton cascade in single semiconductor quantum dots and analytically
derive the density matrix and the Bell's inequalities of the entangled state.
Our model includes different mechanisms that may spoil or even destroy
entanglement such as dephasing, energy splitting of the relay excitonic states
and incoherent population exchange between these relay levels. We explicitly
relate the fidelity of entanglement to the dynamics of these processes and
derive a threshold for violation of Bell's inequalities. Applied to standard
InAs/GaAs self-assembled quantum dots, our model indicates that spontaneous
emission enhancement of the excitonic states by cavity effects increases the
fidelity of entanglement to a value allowing for violation of Bell's
inequalities.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 13:27:24 GMT"
},
{
"version": "v2",
"created": "Wed, 9 Apr 2008 06:56:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Larqué",
"Matthieu",
"",
"LPN"
],
[
"Robert-Philip",
"Isabelle",
"",
"LPN"
],
[
"Beveratos",
"Alexios",
"",
"LPN"
]
] | [
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801.3575 | Nicolas Matagne SE | N. Matagne, Fl. Stancu | The wave function of $[\bf{70},1^-]$ baryons in the $1/N_c$ expansion | 18 pages, 9 tables, 1 section added (mixing angles), minor changes in
the abstract and the conclusions, to be published in Phys. Rev. D | Phys.Rev.D77:054026,2008 | 10.1103/PhysRevD.77.054026 | null | hep-ph | null | Much work has been devoted to the study of nonstrange baryons belonging to
the $[\textbf{70},1^-]$ multiplet in the framework of the $1/N_c$ expansion.
Using group theoretical arguments here we examine the relation between the
exact wave function and the approximate one, customarily used in applications
where the system is separated into a ground state core and an excited quark. We
show that the exact and approximate wave functions globally give similar
results for all of mass operators presented in this work. However we find that
the inclusion of operators acting separately on the core and on the excited
quark deteriorates the fit and leads to unsatisfactory values for the
coefficients which encode the quark dynamics. Much better results are obtained
when we include operators acting on the whole system, both for the exact and
the approximate wave function.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 13:34:30 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Feb 2008 19:49:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Matagne",
"N.",
""
],
[
"Stancu",
"Fl.",
""
]
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] |
801.3576 | Alberto Reis | Alberto Reis (Centro Brasileiro de Pesquisas Fisicas - CBPF) | Scalar mesons from Heavy Flavor Decays | 30 pages, 14 figures, to appear in the Proceedings of the XII
International Conference on Hadron Spectroscopy - HADRON07 - Frascati, Italy | null | null | null | hep-ex | null | In the past few years the B-factories became unexpected players in the scalar
mesons business: in order to access the CP violation effects, it is necessary
to handle the dynamics of the strong interaction between the final state
hadrons. A number of large statistics studies heavy flavor decays involving a
scalar component have been performed recently by Belle and BaBar, who have
joined CLEOc, BES, E791 and FOCUS in the effort to understand the physics of
the scalar mesons. In this talk, the most recent results from these experiments
will be reviewed, with emphasis on the low energy $K\pi$ system and on the
f0(1370).
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 13:34:51 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Reis",
"Alberto",
"",
"Centro Brasileiro de Pesquisas Fisicas - CBPF"
]
] | [
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] |
801.3577 | Michele Fabrizio | Marco Schiro', Massimo Capone, Michele Fabrizio, and Claudio
Castellani | Strongly Correlated Superconductivity rising from a Pseudo-gap Metal | 14 pages, 11 figures | Phys. Rev. B 77, 104522 (2008) | 10.1103/PhysRevB.77.104522 | null | cond-mat.supr-con cond-mat.str-el | null | We solve by Dynamical Mean Field Theory a toy-model which has a phase diagram
strikingly similar to that of high $T_c$ superconductors: a bell-shaped
superconducting region adjacent the Mott insulator and a normal phase that
evolves from a conventional Fermi liquid to a pseudogapped semi-metal as the
Mott transition is approached. Guided by the physics of the impurity model that
is self-consistently solved within Dynamical Mean Field Theory, we introduce an
analytical ansatz to model the dynamical behavior across the various phases
which fits very accurately the numerical data. The ansatz is based on the
assumption that the wave-function renormalization, that is very severe
especially in the pseudogap phase close to the Mott transition, is perfectly
canceled by the vertex corrections in the Cooper pairing channel.A remarkable
outcome is that a superconducting state can develop even from a pseudogapped
normal state, in which there are no low-energy quasiparticles. The overall
physical scenario that emerges, although unraveled in a specific model and in
an infinite-coordination Bethe lattice, can be interpreted in terms of so
general arguments to suggest that it can be realized in other correlated
systems.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 13:37:57 GMT"
}
] | 2008-03-24T00:00:00 | [
[
"Schiro'",
"Marco",
""
],
[
"Capone",
"Massimo",
""
],
[
"Fabrizio",
"Michele",
""
],
[
"Castellani",
"Claudio",
""
]
] | [
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] |
801.3578 | Svetlana Petrova | S. A. Petrova | Interpretation of the Low-Frequency Peculiarities in the Radio Profile
Structure of the Crab Pulsar | 9 pages, no figures. Accepted for publication in MNRAS | MNRAS, 385, 2143 (2008) | 10.1111/j.1365-2966.2008.12978.x | null | astro-ph | null | The theory of magnetized induced scattering off relativistic gyrating
particles is developed. It is directly applicable to the magnetosphere of a
pulsar, in which case the particles acquire gyration energies as a result of
resonant absorption of radio emission. In the course of the radio beam
scattering into background the scattered radiation concentrates along the
ambient magnetic field. The scattering from different harmonics of the particle
gyrofrequency takes place at different characteristic altitudes in the
magnetosphere and, because of the rotational effect, gives rise to different
components in the pulse profile. It is demonstrated that the induced scattering
from the first harmonic into the state under the resonance can account for the
so-called low-frequency component in the radio profile of the Crab pulsar. The
precursor component is believed to result from the induced scattering between
the two states well below the resonance. It is shown that these ideas are
strongly supported by the polarization data observed. Based on an analysis of
the fluctuation behaviour of the scattering efficiencies, the transient
components of a similar nature are predicted for other pulsars.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 13:51:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Petrova",
"S. A.",
""
]
] | [
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] |
801.3579 | Erhan Iltan | Beste Korutlu | Lepton Flavor Violating Radion Decays in the Randall-Sundrum Scenario:
The Thesis | 118 pages, 11 figures, 3 tables | null | null | null | hep-ph | null | The lepton flavor violating interactions are worthwhile to examine since they
are sensitive to physics beyond the Standard Model. The simplest extension of
the Standard Model promoting the lepton flavor violating interactions are the
so called two Higgs doublet model which contains an additional Higgs doublet
carrying the same quantum numbers as the first one. In this model, the lepton
flavor violating interactions are induced by new scalar Higgs bosons, scalar
h^{0} and pseudo scalar A^{0}, and Yukawa couplings, appearing as free
parameters, are determined by using the experimental data. On the other hand,
the possible extra dimensions are interesting in the sense that they ensure a
solution to the hierarchy and cosmological constant problems and also result in
the enhancement in the physical quantities of various processes. In the present
work, we predict the branching ratios of lepton flavor violating radion decays
r-> e^{\pm},\mu^{\pm}, r-> e^{\pm},\tau^{\pm} and r->\mu^{\pm},\tau^{\pm} in
the two Higgs doublet model, including a single extra dimension, in the
framework of the Randall Sundrum scenario. We observed that the branching
ratios of the processes we study are at most at the order of 10^{-8} for the
small values of radion mass and it decreases with the increasing values of the
radion mass. Among the LFV decays we study, the r->\mu^{\pm},\tau^{\pm} decay
would be the most suitable one to measure its branching ratio.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 00:00:59 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Mar 2008 10:03:02 GMT"
}
] | 2008-03-20T00:00:00 | [
[
"Korutlu",
"Beste",
""
]
] | [
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] |
801.358 | Michael Hartmann | H. J. Stein, M. Hartmann, I. Keshelashvili, Y. Maeda, C. Wilkin, S.
Dymov, A. Kacharava, A. Khoukaz, B. Lorentz, R. Maier, T. Mersmann, S.
Mikirtychiants, D. Prasuhn, R. Stassen, H. Stockhorst, H. Str\"oher, Yu.
Valdau, P. W\"ustner | Determination of target thickness and luminosity from beam energy losses | 11 pages, 11 figures | Phys.Rev.STAccel.Beams11:052801,2008 | 10.1103/PhysRevSTAB.11.052801 | null | physics.acc-ph nucl-ex | null | The repeated passage of a coasting ion beam of a storage ring through a thin
target induces a shift in the revolution frequency due to the energy loss in
the target. Since the frequency shift is proportional to the beam-target
overlap, its measurement offers the possibility of determining the target
thickness and hence the corresponding luminosity in an experiment. This effect
has been investigated with an internal proton beam of energy 2.65 GeV at the
COSY-J\"ulich accelerator using the ANKE spectrometer and a hydrogen
cluster-jet target. Possible sources of error, especially those arising from
the influence of residual gas in the ring, were carefully studied, resulting in
a accuracy of better than 5%. The luminosity determined in this way was used,
in conjunction with measurements in the ANKE forward detector, to determine the
cross section for elastic proton-proton scattering. The result is compared to
published data as well as to the predictions of a phase shift solution. The
practicability and the limitations of the energy-loss method are discussed.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 13:56:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Stein",
"H. J.",
""
],
[
"Hartmann",
"M.",
""
],
[
"Keshelashvili",
"I.",
""
],
[
"Maeda",
"Y.",
""
],
[
"Wilkin",
"C.",
""
],
[
"Dymov",
"S.",
""
],
[
"Kacharava",
"A.",
""
],
[
"Khoukaz",
"A.",
""
],
[
"Lorentz",
"B.",
""
],
[
"Maier",
"R.",
""
],
[
"Mersmann",
"T.",
""
],
[
"Mikirtychiants",
"S.",
""
],
[
"Prasuhn",
"D.",
""
],
[
"Stassen",
"R.",
""
],
[
"Stockhorst",
"H.",
""
],
[
"Ströher",
"H.",
""
],
[
"Valdau",
"Yu.",
""
],
[
"Wüstner",
"P.",
""
]
] | [
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] |
801.3581 | Shay Solomon | Yefim Dinitz, Michael Elkin, Shay Solomon | Shallow, Low, and Light Trees, and Tight Lower Bounds for Euclidean
Spanners | 41 pages, 11 figures | null | null | null | cs.CG cs.DS | null | We show that for every $n$-point metric space $M$ there exists a spanning
tree $T$ with unweighted diameter $O(\log n)$ and weight $\omega(T) = O(\log n)
\cdot \omega(MST(M))$. Moreover, there is a designated point $rt$ such that for
every point $v$, $dist_T(rt,v) \le (1+\epsilon) \cdot dist_M(rt,v)$, for an
arbitrarily small constant $\epsilon > 0$. We extend this result, and provide a
tradeoff between unweighted diameter and weight, and prove that this tradeoff
is \emph{tight up to constant factors} in the entire range of parameters. These
results enable us to settle a long-standing open question in Computational
Geometry. In STOC'95 Arya et al. devised a construction of Euclidean Spanners
with unweighted diameter $O(\log n)$ and weight $O(\log n) \cdot
\omega(MST(M))$. Ten years later in SODA'05 Agarwal et al. showed that this
result is tight up to a factor of $O(\log \log n)$. We close this gap and show
that the result of Arya et al. is tight up to constant factors.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 13:57:00 GMT"
}
] | 2011-08-31T00:00:00 | [
[
"Dinitz",
"Yefim",
""
],
[
"Elkin",
"Michael",
""
],
[
"Solomon",
"Shay",
""
]
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801.3582 | Dean Darnell | Dean Darnell | Strange Quark Contribution to the Nucleon - (Dissertation) | 136 pages, 37 figures | null | null | null | hep-lat | null | The strangeness contribution to the electric and magnetic properties of the
nucleon has been under investigation experimentally for many years. Lattice
Quantum Chromodynamics (LQCD) gives theoretical predictions of these
measurements by implementing the continuum gauge theory on a discrete,
mathematical Euclidean space-time lattice which provides a cutoff removing the
ultra-violet divergences. In this dissertation we will discuss effective
methods using LQCD that will lead to a better determination of the strangeness
contribution to the nucleon properties. Strangeness calculations are demanding
technically and computationally. Sophisticated techniques are required to carry
them to completion. In this thesis, new theoretical and computational methods
for this calculation such as twisted mass fermions, perturbative subtraction,
and General Minimal Residual (GMRES) techniques which have proven useful in the
determination of these form factors will be investigated. Numerical results of
the scalar form factor using these techniques are presented. These results give
validation to these methods in future calculations of the strange quark
contribution to the electric and magnetic form factors.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 04:26:57 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Darnell",
"Dean",
""
]
] | [
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801.3583 | Bibhas Majhi Ranjan | Rabin Banerjee, Bibhas Ranjan Majhi and Saurav Samanta | Noncommutative Black Hole Thermodynamics | LaTex, 17 pages, 2 figures, minor changes, references added, to
appear in Phys. Rev. D | Phys.Rev.D77:124035,2008 | 10.1103/PhysRevD.77.124035 | null | hep-th gr-qc | null | We give a general derivation, for any static spherically symmetric metric, of
the relation $T_h=\frac{\cal K}{2\pi}$ connecting the black hole temperature
($T_h$) with the surface gravity ($\cal K$), following the tunneling
interpretation of Hawking radiation. This derivation is valid even beyond the
semi classical regime i. e. when quantum effects are not negligible. The
formalism is then applied to a spherically symmetric, stationary noncommutative
Schwarzschild space time. The effects of back reaction are also included. For
such a black hole the Hawking temperature is computed in a closed form. A
graphical analysis reveals interesting features regarding the variation of the
Hawking temperature (including corrections due to noncommutativity and back
reaction) with the small radius of the black hole. The entropy and tunneling
rate valid for the leading order in the noncommutative parameter are
calculated. We also show that the noncommutative Bekenstein-Hawking area law
has the same functional form as the usual one.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 14:24:20 GMT"
},
{
"version": "v2",
"created": "Tue, 6 May 2008 08:42:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Banerjee",
"Rabin",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
],
[
"Samanta",
"Saurav",
""
]
] | [
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] |
801.3584 | Piero Olla | Piero Olla | Clustering and collision of inertial particles in random velocity fields | 4 pages, 3 figures, revtex4 | Phys. Rev. E Vol. 77, 065301(R) (2008) | 10.1103/PhysRevE.77.065301 | null | cond-mat.stat-mech nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The influence of clustering on the collision rate of inertial particles in a
smooth random velocity field, mimicking the smaller scales of a turbulent flow,
is analyzed. For small values of the the ratio between the relaxation time of
the particle velocity and the characteristic time of the field, the effect of
clusters is to make more energetic collisions less likely. The result is
independent of the flow dimensionality and is due only to the origin of
collisions in the process of caustic formation.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 14:13:09 GMT"
},
{
"version": "v2",
"created": "Sun, 15 Jun 2008 19:40:37 GMT"
},
{
"version": "v3",
"created": "Thu, 19 Jun 2008 12:18:52 GMT"
},
{
"version": "v4",
"created": "Fri, 26 Sep 2008 13:32:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Olla",
"Piero",
""
]
] | [
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801.3585 | Dalia Chakrabarty Dr. | Dalia Chakrabarty, Laura Ferrarese | DOPING: a New Non-parametric Deprojection Scheme | 8 pages; to be published in IJMP(D) (Feb, 2008 issue), Vol 17, No. 2,
as part of proceedings for the 6th International Workshop on Data Analysis in
Astronomy, ``Modelling and Simulations in Science'' | Int.J.Mod.Phys.D17:195-201,2008 | 10.1142/S0218271808011948 | null | astro-ph | null | We present a new non-parametric deprojection algorithm DOPING (Deprojection
of Observed Photometry using and INverse Gambit), that is designed to extract
the three dimensional luminosity density distribution $\rho$, from the observed
surface brightness profile of an astrophysical system such as a galaxy or a
galaxy cluster, in a generalised geometry, while taking into account changes in
the intrinsic shape of the system. The observable is the 2-D surface brightness
distribution of the system. While the deprojection schemes presented hitherto
have always worked within the limits of an assumed intrinsic geometry, in
DOPING, geometry and inclination can be provided as inputs. The $\rho$ that is
most likely to project to the observed brightness data is sought; the
maximisation of the likelihood is performed with the Metropolis algorithm.
Unless the likelihood function is maximised, $\rho$ is tweaked in shape and
amplitude, while maintaining positivity, but otherwise the luminosity
distribution is allowed to be completely free-form. Tests and applications of
the algorithm are discussed.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 14:27:36 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Chakrabarty",
"Dalia",
""
],
[
"Ferrarese",
"Laura",
""
]
] | [
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801.3586 | Jan Timmermans | DELPHI Collaboration: J. Abdallah, et al | Higgs boson searches in CP-conserving and CP-violating MSSM scenarios
with the DELPHI detector | 52 pages, 21 figures, Accepted by Eur. Phys. J. C. A version with
higher resolution figure 5 can be found at
http://delphiwww.cern.ch/pubxx/papers/public/paper0365.ps.gz | Eur.Phys.J.C54:1-35,2008; Erratum-ibid.C56:165-170,2008 | 10.1140/epjc/s10052-007-0506-1 10.1140/epjc/s10052-008-0647-x | CERN-PH-EP/2007-029, DAPNIA-07-150 | hep-ex | null | This paper presents the final interpretation of the results from DELPHI on
the searches for Higgs bosons in the Minimal Supersymmetric extension of the
Standard Model (MSSM). A few representative scenarios are considered, that
include CP conservation and explicit CP violation in the Higgs sector. The
experimental results encompass the searches for neutral Higgs bosons at LEP1
and LEP2 in final states as expected in the MSSM, as well as LEP2 searches for
charged Higgs bosons and for neutral Higgs bosons decaying into hadrons
independent of the quark flavour. The data reveal no significant excess with
respect to background expectations. The results are translated into excluded
regions of the parameter space in the various scenarios. In the CP-conserving
case, these lead to limits on the masses of the lightest scalar and
pseudoscalar Higgs bosons, h and A, and on tan(beta). The dependence of these
limits on the top quark mass is discussed. Allowing for CP violation reduces
the experimental sensitivity to Higgs bosons. It is shown that this effect
depends strongly on the values of the parameters responsible for CP violation
in the Higgs sector.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:06:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"DELPHI Collaboration",
"",
""
],
[
"Abdallah",
"J.",
""
]
] | [
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] |
801.3587 | Giuseppe G. N. Angilella | G. Forte, A. Grassi, G. M. Lombardo, G. G. N. Angilella, N. H. March,
R. Pucci | Molecules in clusters: the case of planar LiBeBCNOF built from a
triangular form LiOB and a linear four-center species FBeCN | to appear in Phys. Lett. A | Phys. Lett. A 372 (2008) 3253 | 10.1016/j.physleta.2008.01.046 | null | cond-mat.other | null | Krueger some years ago proposed a cluster LiBeBCNOF, now called periodane.
His ground-state isomer proposal has recently been refined by Bera et al. using
DFT. Here, we take the approach of molecules in such a cluster as starting
point. We first study therefore the triangular molecule LiOB by coupled cluster
theory (CCSD) and thereby specify accurately its equilibrium geometry in free
space. The second fragment we consider is FBeCN, but treated now by restricted
Hartree-Fock (RHF) theory. This four-center species is found to be linear, and
the bond lengths are obtained from both RHF and CCSD calculations. Finally, we
bring these two entities together and find that while LiOB remains largely
intact, FBeCN becomes bent by the interaction with LiOB. Hartree-Fock and CCSD
theories then predict precisely the same lowest isomer found by Bera et al.
solely on the basis of DFT.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 14:33:45 GMT"
}
] | 2008-04-10T00:00:00 | [
[
"Forte",
"G.",
""
],
[
"Grassi",
"A.",
""
],
[
"Lombardo",
"G. M.",
""
],
[
"Angilella",
"G. G. N.",
""
],
[
"March",
"N. H.",
""
],
[
"Pucci",
"R.",
""
]
] | [
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] |
801.3588 | Jean-Jacques Sinou | Jean-Jacques Sinou (LTDS), Fabrice Thouverez (LTDS), Louis Jezequel
(LTDS) | Center manifold and multivariable approximants applied to non-linear
stability analysis | null | International Journal of Non-Linear Mechanics 38, 9 (2003)
1421-1442 | 10.1016/S0020-7462(02)00080-X | null | nlin.CD math.DS | null | This paper presents a research devoted to the study of instability phenomena
in non-linear model with a constant brake friction coefficient. This paper
outlines the stability analysis and a procedure to reduce and simplify the
non-linear system, in order to obtain limit cycle amplitudes. The center
manifold approach, the multivariable approximants theory, and the alternate
frequency/time domain (AFT) method are applied. Brake vibrations, and more
specifically heavy trucks grabbing are concerned. The modelling introduces
sprag-slip mechanism based on dynamic coupling due to buttressing. The
non-linearity is expressed as a polynomial with quadratic and cubic terms. This
model does not require the use of brake negative coefficient, in order to
predict the instability phenomena. Finally, the center manifold approach, the
multivariable approximants, and the AFT method are used in order to obtain
equations for the limit cycle amplitudes. These methods allow the reduction of
the number of equations of the original system in order to obtain a simplified
system, without loosing the dynamics of the original system, as well as the
contributions of non-linear terms. The goal is the validation of this procedure
for a complex non-linear model by comparing results obtained by solving the
full system and by using these methods. The brake friction coefficient is used
as an unfolding parameter of the fundamental Hopf bifurcation point.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 14:34:19 GMT"
}
] | 2012-09-28T00:00:00 | [
[
"Sinou",
"Jean-Jacques",
"",
"LTDS"
],
[
"Thouverez",
"Fabrice",
"",
"LTDS"
],
[
"Jezequel",
"Louis",
"",
"LTDS"
]
] | [
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] |
801.3589 | Alexander Lutovinov | A. Lutovinov (1), M. Revnivtsev (2,1), M. Gilfanov (2,1), R. Sunyaev
(2,1) (1 - Space Research Institute, Moscow; 2 - Max-Plank Institute fur
Astrophysics, Garching) | Population of HMXB in the Galaxy | 5 pages, 4 figures | Proceedings of the 6th INTEGRAL Workshop "The Obscured Universe",
Published by ESA, 2007, SP-622, P.241-245 | null | null | astro-ph | null | We study populations of High-Mass X-ray Binaries in the Galaxy using data of
the INTEGRAL observatory in a hard X-ray energy band. More than two hundreds of
sources were detected with INTEGRAL near the galactic plane (|b|<5 deg), most
of them have a galactic origin and belong to high (HMXB) and low mass (LMXB)
X-ray binaries. We investigated properties and spectra of a large sample of
HMXBs and concluded that most of them are belong to X-ray pulsars. We also
build the distribution of HMXBs for the whole Galaxy and showed that its peaks
are practically coincident with spiral arm tangents. The obtained results are
discussed in terms of some model estimations of the density of different
components of the Galaxy.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 14:36:14 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Lutovinov",
"A.",
""
],
[
"Revnivtsev",
"M.",
""
],
[
"Gilfanov",
"M.",
""
],
[
"Sunyaev",
"R.",
""
]
] | [
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] |
801.359 | Hrant Gulkanyan | N.M.Agababyan, V.V.Ammosov, M.Atayan, N.Grigoryan, H.Gulkanyan,
A.A.Ivanilov, Zh.Karamyan, V.A.Korotkov | Charged rho meson production in neutrino-induced reactions at E_nu = 10
GeV | 7 pages, 6 figures | Phys.Atom.Nucl.74:221-228,2011 | 10.1134/S1063778811020025 | null | hep-ex | null | The neutrinoproduction of charged $\rho$ mesons on nuclei and nucleons is
investigated for the first time at moderate energies ($<E_\nu > \approx$ 10
GeV), using the date obtained with SKAT bubble chamber. No strong nuclear
effects are observed in $\rho^+$ and $\rho^-$ production. The fractions of
charged and neutral pions originating from $\rho$ decays are obtained and
compared with higher energy data. From analysis of the obtained and available
data on $\rho^+$ and $K^{*+}$(892) neutrinoproduction, the strangeness
suppression factor in the quark string fragmentation is extracted: $\lambda_s =
0.18\pm0.03$. Estimations are obtained for cross sections of quasiexclusive
single $\rho^+$ and coherent $\rho^+$ neutrinoproduction on nuclei. The
estimated coherent cross section $\sigma_{\rho^+}^{coh}$ = (0.29$\pm0.16)\cdot
10^{-38}$ cm$^2$ is compatible with theoretical predictions.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 14:36:55 GMT"
}
] | 2011-03-14T00:00:00 | [
[
"Agababyan",
"N. M.",
""
],
[
"Ammosov",
"V. V.",
""
],
[
"Atayan",
"M.",
""
],
[
"Grigoryan",
"N.",
""
],
[
"Gulkanyan",
"H.",
""
],
[
"Ivanilov",
"A. A.",
""
],
[
"Karamyan",
"Zh.",
""
],
[
"Korotkov",
"V. A.",
""
]
] | [
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] |
801.3591 | Panayotis Boumis | P. Boumis (1), J. Alikakos (1,2), P. E. Christopoulou (2), F.
Mavromatakis (3), E. M. Xilouris (1), C. D. Goudis (1,3) ((1) Institute of
Astronomy & Astrophysics, National Observatory of Athens, Greece, (2)
Astronomical Laboratory, Department of Physics, University of Patras, Greece,
(3) Technological Education Institute of Crete, General Department of Applied
Science, Heraklion, Crete, Greece) | First optical detection from the supernova remnant G 15.1-1.6 | 12 pages, 6 figures, 3 tables. Accepted for pubication in A&A | null | 10.1051/0004-6361:20079156 | null | astro-ph | null | Deep optical CCD images of the supernova remnant G 15.1-1.6 were obtained and
filamentary and diffuse emission has been discovered. The images, taken in the
emission lines of Halpha+[N II], [S II] and [O III], reveal filamentary and
diffuse structures all around the remnant. The radio emission at 4850 MHz in
the same area is found to be well correlated with the brightest optical
filaments. The IRAS 60 micron emission may also be correlated with the optical
emission but to a lesser extent. The flux calibrated images suggest that the
optical emission originates from shock-heated gas ([S II]/Halpha > 0.4), while
there is a possible HII region ([S II]/Halpha ~0.3) contaminating the supernova
remnant's emission to the east. Furthermore, deep long-slit spectra were taken
at two bright filaments and also show that the emission originates from shock
heated gas. An [O III] filamentary structure has also been detected further to
the west but it lies outside the remnant's boundaries and possibly is not
associated to it. The [O III] flux suggests shock velocities into the
interstellar "clouds" ~100 km/s, while the [S II] 6716/6731 ratio indicates
electron densities up to ~250 cm^{-3}. Finally, the Halpha emission has been
measured to be between 2 to 7 x 10^{-16} erg/s/cm^2/arcsec^2, while the lower
limit to the distance is estimated at 2.2 kpc.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 14:41:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Boumis",
"P.",
""
],
[
"Alikakos",
"J.",
""
],
[
"Christopoulou",
"P. E.",
""
],
[
"Mavromatakis",
"F.",
""
],
[
"Xilouris",
"E. M.",
""
],
[
"Goudis",
"C. D.",
""
]
] | [
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] |
801.3592 | Didier Henrion | Didier Henrion (LAAS) | Detecting rigid convexity of bivariate polynomials | null | null | null | null | math.OC | null | Given a polynomial $x \in {\mathbb R}^n \mapsto p(x)$ in $n=2$ variables, a
symbolic-numerical algorithm is first described for detecting whether the
connected component of the plane sublevel set ${\mathcal P} = \{x : p(x) \geq
0\}$ containing the origin is rigidly convex, or equivalently, whether it has a
linear matrix inequality (LMI) representation, or equivalently, if polynomial
$p(x)$ is hyperbolic with respect to the origin. The problem boils down to
checking whether a univariate polynomial matrix is positive semidefinite, an
optimization problem that can be solved with eigenvalue decomposition. When the
variety ${\mathcal C} = \{x : p(x) = 0\}$ is an algebraic curve of genus zero,
a second algorithm based on B\'ezoutians is proposed to detect whether
$\mathcal P$ has an LMI representation and to build such a representation from
a rational parametrization of $\mathcal C$. Finally, some extensions to
positive genus curves and to the case $n>2$ are mentioned.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 14:46:24 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Henrion",
"Didier",
"",
"LAAS"
]
] | [
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] |
801.3593 | Eugene Levin | E. Levin and J. Miller (Tel Aviv Univ.) | Central exclusive diffractive Higgs boson production in hadron-nucleus
and nucleus-nucleus collisions at the LHC | 8 pages with three figures in eps files | null | null | TAUP -28681/08\ | hep-ph | null | In this paper, it is shown that in hadron-nucleus and nucleus-nucleus
collisions, the main source for central exclusive diffractive Higgs production
is photon-photon fusion. At the LHC energy, the total cross section for this
process is about 0.6 pb (for proton-gold scattering), and 3.9 nb (for gold-gold
collision) while the gluon-gluon fusion leads to the value of the cross section
for CED Higgs production which is about 0.1 nb and 3.9 pb respectively.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 15:40:59 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Levin",
"E.",
"",
"Tel Aviv Univ."
],
[
"Miller",
"J.",
"",
"Tel Aviv Univ."
]
] | [
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] |
801.3594 | Francois Lallet | F. Lallet, N. Olivi-Tran, Laurent J. Lewis | Interface energies of (100)_{YSZ} and (111)_{YSZ} epitaxial islands on
(0001)_{alpha-Al_2O_3} substrates from first principles | 25 pages, 5 figures, 10 tables, submitted to Physical Review B | null | 10.1103/PhysRevB.79.035413 | null | cond-mat.mtrl-sci cond-mat.other | null | We present an ab initio study of the interface energies of cubic
yttria-stabilized zirconia (YSZ) epitaxial layers on a (0001)_{alpha-Al_2O_3}
substrate. The interfaces are modelled using a supercell geometry and the
calculations are carried out in the framework of density-functional theory
(DFT) and the local-density approximation (LDA) using the
projector-augmented-wave (PAW) pseudopotential approach. Our calculations
clearly demonstrate that the (111)_{YSZ} || (0001)_{alpha-Al_2O_3} interface
energy is lower than that of (100)_{YSZ} || (0001)_{alpha-Al_2O_3}. This result
is central to understanding the behaviour of YSZ thin solid film islanding on
(0001)_{alpha-Al_2O_3} substrates, either flat or in presence of defects.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:51:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lallet",
"F.",
""
],
[
"Olivi-Tran",
"N.",
""
],
[
"Lewis",
"Laurent J.",
""
]
] | [
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] |
801.3595 | Dr Pierre Maxted | P. F. L. Maxted (1), R. D. Jeffries (1), J. M. Oliveira (1), T. Naylor
(2), R. J. Jackson (1) ((1) Keele, (2) Exeter) | A survey for low mass spectroscopic binary stars in the young clusters
around sigma Orionis and lambda Orionis | Accepted for publication in MNRAS. The paper contains 17 figures and
4 tables. Tables 2 and 3 will be published online only | null | 10.1111/j.1365-2966.2008.13008.x | null | astro-ph | null | We have obtained multi-epoch, high-resolution spectroscopy of 218 candidate
low-mass stars and brown dwarfs in the young clusters around sigma Ori and
lambda Ori. We find that 196 targets are cluster members based on their radial
velocity, the equivalent width of their NaI 8200 lines and the spectral type
from their TiO band strength. We have identified 11 new binary stars among the
cluster members based on their variable radial velocity and an additional
binary from the variation in its line width and shape. The sample covers the
magnitude range Ic=14-18.9 (mass =~ 0.55-0.03 Msun), but all of the binary
stars are brighter than Ic=16.6 (mass =~ 0.12Msun) and 10 are brighter than
Ic=15.5 (mass =~ 0.23Msun). There is a significant lack of spectroscopic
binaries in our sample at faint magnitudes even when we account for the
decrease in sensitivity with increasing magnitude. We can reject the hypothesis
that the fraction of spectroscopic binaries is a uniform function of Ic
magnitude with more than 99% confidence. The spectroscopic binary fraction for
stars more massive than about 0.1Msun (Ic < 16.9) is
f_bright=0.095(+0.012)(-0.028). The 90% confidence upper limit to the
spectroscopic binary fraction for very low mass (VLM) stars (mass < 0.1Msun)
and brown dwarfs (BDs) is f_faint < 7.5%. The hypothesis that f_bright and
f_faint are equal can be rejected with 90% confidence. We conclude that we have
found strong evidence for a change in the fraction of spectroscopic binaries
among young VLM stars and brown dwarfs when compared to more massive stars in
the same star-forming region. This implies a difference in the total binary
fraction between VLM stars and BDs compared to more massive stars or a
difference in the distribution of semi-major axes, or both. (Abridged)
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 15:19:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Maxted",
"P. F. L.",
"",
"Keele"
],
[
"Jeffries",
"R. D.",
"",
"Keele"
],
[
"Oliveira",
"J. M.",
"",
"Keele"
],
[
"Naylor",
"T.",
"",
"Exeter"
],
[
"Jackson",
"R. J.",
"",
"Keele"
]
] | [
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801.3596 | Cyril Pitrou | Cyril Pitrou, Thiago S. Pereira and Jean-Philippe Uzan | Predictions from an anisotropic inflationary era | 48 pages | JCAP 0804:004,2008 | 10.1088/1475-7516/2008/04/004 | null | astro-ph gr-qc hep-th | null | This article investigates the predictions of an inflationary phase starting
from a homogeneous and anisotropic universe of the Bianchi I type. After
discussing the evolution of the background spacetime, focusing on the number of
e-folds and the isotropization, we solve the perturbation equations and predict
the power spectra of the curvature perturbations and gravity waves at the end
of inflation. The main features of the early anisotropic phase is (1) a
dependence of the spectra on the direction of the modes, (2) a coupling between
curvature perturbations and gravity waves, and (3) the fact that the two
gravity waves polarisations do not share the same spectrum on large scales. All
these effects are significant only on large scales and die out on small scales
where isotropy is recovered. They depend on a characteristic scale that can,
but a priori must not, be tuned to some observable scale. To fix the initial
conditions, we propose a procedure that generalises the one standardly used in
inflation but that takes into account the fact that the WKB regime is violated
at early times when the shear dominates. We stress that there exist modes that
do not satisfy the WKB condition during the shear-dominated regime and for
which the amplitude at the end of inflation depends on unknown initial
conditions. On such scales, inflation loses its predictability. This study
paves the way to the determination of the cosmological signature of a
primordial shear, whatever the Bianchi I spacetime. It thus stresses the
importance of the WKB regime to draw inflationary predictions and demonstrates
that when the number of e-folds is large enough, the predictions converge
toward those of inflation in a Friedmann-Lemaitre spacetime but that they are
less robust in the case of an inflationary era with a small number of e-folds.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 15:10:43 GMT"
},
{
"version": "v2",
"created": "Thu, 1 May 2008 09:54:36 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Pitrou",
"Cyril",
""
],
[
"Pereira",
"Thiago S.",
""
],
[
"Uzan",
"Jean-Philippe",
""
]
] | [
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] |
801.3597 | Jean-Marie Lescure | Claire Debord, Jean-Marie Lescure | K-duality for stratified pseudomanifolds | null | null | null | null | math.OA math.KT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to the study of Poincar\'e duality in K-theory for
general stratified pseudomanifolds. We review the axiomatic definition of a
smooth stratification $\fS$ of a topological space $X$ and we define a groupoid
$T^{\fS}X$, called the $\fS$-tangent space. This groupoid is made of different
pieces encoding the tangent spaces of the strata, and these pieces are glued
into the smooth noncommutative groupoid $T^{\fS}X$ using the familiar procedure
introduced by A. Connes for the tangent groupoid of a manifold. The main result
is that $C^{*}(T^{\fS}X)$ is Poincar\'e dual to $C(X)$, in other words, the
$\fS$-tangent space plays the role in $K$-theory of a tangent space for $X$.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 15:13:27 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jun 2008 08:37:44 GMT"
},
{
"version": "v3",
"created": "Wed, 17 Sep 2008 09:44:54 GMT"
},
{
"version": "v4",
"created": "Mon, 31 May 2010 09:09:44 GMT"
}
] | 2012-09-18T00:00:00 | [
[
"Debord",
"Claire",
""
],
[
"Lescure",
"Jean-Marie",
""
]
] | [
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] |
801.3598 | Gernot Muenster | Michael H. K\"opf and Gernot M\"unster (University of Muenster) | Interfacial roughening in field theory | 16 pages, 4 Postscript figure | J. Stat. Phys. 132 (2008) 417 | 10.1007/s10955-008-9572-5 | MS-TP-08-01 | cond-mat.stat-mech | null | In the rough phase, the width of interfaces separating different phases of
statistical systems increases logarithmically with the system size. This
phenomenon is commonly described in terms of the capillary wave model, which
deals with fluctuating, infinitely thin membranes, requiring ad hoc cut-offs in
momentum space. We investigate the interface roughening from first principles
in the framework of the Landau-Ginzburg model, that is renormalized field
theory, in the one-loop approximation. The interface profile and width are
calculated analytically, resulting in finite expressions with definite
coefficients. They are valid in the scaling region and depend on the known
renormalized coupling constant.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 15:16:00 GMT"
}
] | 2013-06-17T00:00:00 | [
[
"Köpf",
"Michael H.",
"",
"University of Muenster"
],
[
"Münster",
"Gernot",
"",
"University of Muenster"
]
] | [
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] |
801.3599 | George Chartas | C. Saez, G. Chartas, W. N. Brandt, B. D. Lehmer, F. E. Bauer, X. Dai,
G. P. Garmire | Confirmation of a correlation between the X-ray luminosity and spectral
slope of AGNs in the Chandra Deep Fields | Comments: 20 pages, includes 17 figures, Accepted for publication in
AJ | null | 10.1088/0004-6256/135/4/1505 | null | astro-ph | null | We present results from a statistical analysis of 173 bright radio-quiet AGNs
selected from the Chandra Deep Field-North and Chandra Deep Field-South surveys
(hereafter, CDFs) in the redshift range of 0.1 < z < 4. We find that the X-ray
power-law photon index (Gamma) of radio-quiet AGNs is correlated with their
2-10 keV rest-frame X-ray luminosity (L_X) at the > 99.5 percent confidence
level in two redshift bins, 0.3 < z < 0.96, and 1.5 < z < 3.3 and is slightly
less significant in the redshift bin 0.96 < z < 1.5. We investigate the
redshift evolution of the correlation between the power-law photon index and
the hard X-ray luminosity and find that the slope and offset of a linear fit to
the correlation change significantly (at the > 99.9 percent confidence level)
between redshift bins of 0.3 < z < 0.96 and 1.5 < z < 3.3. We explore physical
scenarios explaining the origin of this correlation and its possible evolution
with redshift in the context of steady corona models focusing on its dependency
on variations of the properties of the hot corona with redshift.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 15:23:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Saez",
"C.",
""
],
[
"Chartas",
"G.",
""
],
[
"Brandt",
"W. N.",
""
],
[
"Lehmer",
"B. D.",
""
],
[
"Bauer",
"F. E.",
""
],
[
"Dai",
"X.",
""
],
[
"Garmire",
"G. P.",
""
]
] | [
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801.36 | Marta Casanellas | Marta Casanellas and Robin Hartshorne | ACM bundles on cubic surfaces | 25 pages, no figures, references added, Example 3.8 extended | null | null | null | math.AG math.AC | null | In this paper we prove that, for every $r \geq 2$, the moduli space
$M^s_X(r;c_1,c_2)$ of rank $r$ stable vector bundles with Chern classes
$c_1=rH$ and $c_2=(3r^2-r)/2$ on a nonsingular cubic surface $X \subset
\mathbb{P}^3$ contains a nonempty smooth open subset formed by ACM bundles,
i.e. vector bundles with no intermediate cohomology. The bundles we consider
for this study are extremal for the number of generators of the corresponding
module (these are known as Ulrich bundles), so we also prove the existence of
indecomposable Ulrich bundles of arbitrarily high rank on $X$.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 15:24:00 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Feb 2008 10:43:21 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Casanellas",
"Marta",
""
],
[
"Hartshorne",
"Robin",
""
]
] | [
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] |
801.3601 | Vitaly Kresin | Roman Rabinovitch, Chunlei Xia, and Vitaly V. Kresin | Evaporative attachment of slow electrons to alkali nanoclusters | 9 pages, 3 figures, revised | Phys. Rev. A 77, 063202 (2008) | 10.1103/PhysRevA.77.063202 | null | physics.atm-clus | null | The abundance spectrum of Na^-_{n~7-140} anions formed by low energy electron
attachment to free nanoclusters is measured to be strongly and nontrivially
restructured with respect to the neutral precursor beam. This restructuring is
explained in quantitative detail by a general framework of evaporative
attachment: an electron is captured by the long-range polarization potential,
its energy is transferred into thermal vibrations, and dissipated by
evaporative cooling. The data also affirm a formulated relation between the
binding energies of cationic, neutral, and anionic clusters, and an adjustment
to the prior values of dimer evaporation energies.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:03:04 GMT"
},
{
"version": "v2",
"created": "Sat, 10 May 2008 04:39:39 GMT"
}
] | 2008-06-11T00:00:00 | [
[
"Rabinovitch",
"Roman",
""
],
[
"Xia",
"Chunlei",
""
],
[
"Kresin",
"Vitaly V.",
""
]
] | [
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] |
801.3602 | Rainer H\"artle | R. H\"artle, C. Benesch, M. Thoss | Multimode vibrational effects in single molecule conductance: A
nonequilibrium Green's function approach | 31 pages, 10 figures | Phys. Rev. B 77, 205314 (2008) | 10.1103/PhysRevB.77.205314 | null | cond-mat.mes-hall | null | The role of multimode vibrational dynamics in electron transport through
single molecule junctions is investigated. The study is based on a generic
model, which describes charge transport through a single molecule that is
attached to metal leads. To address vibrationally-coupled electron transport,
we employ a nonequilibrium Green's function approach that extends a method
recently proposed by Galperin et al. [Phys. Rev. B 73, 045314 (2006)] to
multiple vibrational modes. The methodology is applied to two systems: a
generic model with two vibrational degrees of freedom and
benzenedibutanethiolate covalently bound to gold electrodes. The results show
that the coupling to multiple vibrational modes can have a significant effect
on the conductance of a molecular junction. In particular, we demonstrate the
effect of electronically induced coupling between different vibrational modes
and study nonequilibrium vibrational effects by calculating the current-induced
excitation of vibrational modes.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 15:33:10 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 18:24:27 GMT"
}
] | 2010-10-26T00:00:00 | [
[
"Härtle",
"R.",
""
],
[
"Benesch",
"C.",
""
],
[
"Thoss",
"M.",
""
]
] | [
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801.3603 | Yuval Weiss | Yuval Weiss | Influence of spin and interactions on quantum dots and nano-wires | PhD dissertation, Bar-Ilan university, Israel, 2007 (177 pages) | null | null | null | cond-mat.str-el cond-mat.dis-nn cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this dissertation we use sophisticated numerical methods in order to
examine ground-state (GS) properties of two types of quantum systems with
electron electron interactions: A quantum dot (QD) and a nano-wire. In the
first half of the work we study a system of a single level coupled to a
one-dimensional wire with interacting spinless electrons, when the wire is
either clean or disordered. We utilize the density-matrix renormalization-group
(DMRG) method to investigate the influence of the level on several
thermodynamic properties of the clean interacting wire, which can be in one of
two phases: Tomonaga-Luttinger liquid and charge density wave phases. When the
wire is disordered, we investigate the Friedel oscillations, exploring the
difference between the two phases and comparing them to the clean
non-interacting case, for which we develop an exact formula for the
oscillations. In the second half of the dissertation we study two cases of an
isolated two-dimensional QD. We begin by an investigation of a new numerical
method, the particle-hole DMRG (PH-DMRG), which is used to calculate the GS
energy of a disordered QD consisting of interacting spinless electrons. We show
that this method is much more accurate than the Hartree-Fock method, and we
suggest an improvement of the algorithm, which reduces the error rate by almost
30 percents. Finally we study the magnetization of a QD with spin 1/2
electrons, in the presence of spin-orbit coupling and interactions. We
calculate the g-factor and the expectation values of the spin operators in the
GS, and find that when the QD is occupied by an even number of electrons, the
GS can have a finite magnetization.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:17:18 GMT"
},
{
"version": "v2",
"created": "Sun, 29 Jun 2008 15:12:44 GMT"
}
] | 2008-06-29T00:00:00 | [
[
"Weiss",
"Yuval",
""
]
] | [
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] |
801.3604 | Lukas Schneebeli | L. Schneebeli, M. Kira, S.W. Koch | Characterization of strong light-matter coupling in semiconductor
quantum-dot microcavities via photon-statistics spectroscopy | 4 pages, 2 figures | Phys. Rev. Lett. 101, 097401 (2008) | 10.1103/PhysRevLett.101.097401 | null | quant-ph | null | It is shown that spectrally resolved photon-statistics measurements of the
resonance fluorescence from realistic semiconductor quantum-dot systems allow
for high contrast identification of the two-photon strong-coupling states.
Using a microscopic theory, the second-rung resonance is analyzed and optimum
excitation conditions are determined. The computed photon-statistics spectrum
displays gigantic, experimentally robust resonances at the energetic positions
of the second-rung emission.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 15:41:51 GMT"
}
] | 2008-08-29T00:00:00 | [
[
"Schneebeli",
"L.",
""
],
[
"Kira",
"M.",
""
],
[
"Koch",
"S. W.",
""
]
] | [
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] |
801.3605 | Gwyneth Stallard | P.J.Rippon and G.M.Stallard | Escaping points of entire functions of small growth | null | null | null | null | math.CV math.DS | null | Let $f$ be a transcendental entire function and let $I(f)$ denote the set of
points that escape to infinity under iteration. We give conditions which ensure
that, for certain functions, $I(f)$ is connected. In particular, we show that
$I(f)$ is connected if $f$ has order zero and sufficiently small growth or has
order less than 1/2 and regular growth. This shows that, for these functions,
Eremenko's conjecture that $I(f)$ has no bounded components is true. We also
give a new criterion related to $I(f)$ which is sufficient to ensure that $f$
has no unbounded Fatou components.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 15:51:25 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Rippon",
"P. J.",
""
],
[
"Stallard",
"G. M.",
""
]
] | [
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0.0443529226,
0.0068653426,
-0.0313062519,
-0.0321702696,
0.0278069787,
0.0192387998,
-0.0473481864,
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] |
801.3606 | Ayesha Begum Dr | Ayesha Begum, Jayaram N. Chengalur, I. D. Karachentsev and M. E.
Sharina | Baryonic Tully-Fisher Relation for Extremely Low Mass Galaxies | 7 pages, 7 figures. Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13010.x | null | astro-ph | null | We study Tully-Fisher relations for a sample that combines extremely faint
(M_B > -14.0) galaxies along with bright (i.e. L_*) galaxies. Accurate (~ 10%)
distances, I band photometry, and B-V colors are known for the majority of the
galaxies in our sample. The faint galaxies are drawn from the Faint Irregular
Galaxy GMRT survey (FIGGS), and we have HI rotation velocities derived from
aperture synthesis observations for all of them. For the faint galaxies, we
find that even though the median HI and stellar masses are comparable, the HI
mass correlates significantly better with the circular velocity indicators than
the stellar mass. We also find that W$_{20}$ correlates better with mass than
the rotation velocity, although the difference is not statistically
significant. The faint galaxies lie systematically below the I band TF relation
defined by bright galaxies, and also show significantly more intrinsic scatter.
This implies that the integrated star formation in these galaxies has been both
less efficient and also less regulated than in large galaxies. We find that
while the faint end deviation is greatly reduced in Baryonic Tully-Fisher (BTF)
relations, the existence of a break at the faint end of the BTF is subject to
systematics such as the assumed stellar mass to light ratio. If we assume that
there is an intrinsic BTF and try to determine the baryonic mass by searching
for prescriptions that lead to the tightest BTF, we find that scaling the HI
mass leads to a much more significant tightening than scaling the stellar mass
to light ratio. The most significant tightening that we find however, is if we
scale the entire baryonic mass of the faint (but not the bright) galaxies. Such
a scenario would be consistent with models where dwarf (but not large) galaxies
have a large fraction of dark or ``missing'' baryons (Slightly abridged)
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 15:47:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Begum",
"Ayesha",
""
],
[
"Chengalur",
"Jayaram N.",
""
],
[
"Karachentsev",
"I. D.",
""
],
[
"Sharina",
"M. E.",
""
]
] | [
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] |
801.3607 | Liviu Hozoi | L. Hozoi, M. S. Laad, and P. Fulde | Fermiology of Cuprates from First Principles: From Small Pockets to the
Luttinger Fermi surface | null | Phys. Rev. B 78, 165107 (2008) | 10.1103/PhysRevB.78.165107 | null | cond-mat.str-el cond-mat.supr-con | null | Fermiology, the shape and size of the Fermi surface, underpins the
low-temperature physical properties of a metal. Recent investigations of the
Fermi surface of high-Tc superconductors, however, show a most unusual
behavior: upon addition of carriers, ``Fermi'' pockets appear around nodal
(hole doping) and antinodal (electron doping) regions of the Brillouin zone in
the ``pseudogap'' state. With progressive doping, p, these evolve into
well-defined Fermi surfaces around optimal doping (p_opt), with no pseudogap.
Correspondingly, various physical responses, including d-wave
superconductivity, evolve from highly anomalous, up to p_opt, to more
conventional beyond. Describing this evolution holds the key to understanding
high-temperature superconductivity. Here, we present ab initio quantum chemical
results for cuprates, providing a quantitative description of the evolution of
the Fermi surface with doping. Our results constitute an ab initio
justification for several, hitherto proposed semiphenomenological theories,
offering an unified basis for understanding of various, unusual physical
responses of doped cuprates.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 15:48:23 GMT"
}
] | 2008-10-13T00:00:00 | [
[
"Hozoi",
"L.",
""
],
[
"Laad",
"M. S.",
""
],
[
"Fulde",
"P.",
""
]
] | [
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] |
801.3608 | Mikael Fogelstrom | Jonas Skoldberg, Tomas Lofwander, Vitaly S. Shumeiko, and Mikael
Fogelstrom | Spectrum of Andreev Bound States in a Molecule Embedded Inside a
Microwave-Excited Superconducting Junction | Published version; 4+ pages, 3 figures | Physical Review Letters 101 087002 (2008) | 10.1103/PhysRevLett.101.087002 | null | cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-dissipative Josephson current through nanoscale superconducting
constrictions is carried by spectroscopically sharp energy states, so-called
Andreev bound states. Although theoretically predicted almost 40 years ago, no
direct spectroscopic evidence of these Andreev bound states exists to date. We
propose a novel type of spectroscopy based on embedding a superconducting
constriction, formed by a single-level molecule junction, in a microwave QED
cavity environment. In the electron-dressed cavity spectrum we find a polariton
excitation at twice the Andreev bound state energy, and a superconducting-phase
dependent ac Stark shift of the cavity frequency. Dispersive measurement of
this frequency shift can be used for Andreev bound state spectroscopy.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:00:56 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Mar 2008 21:03:06 GMT"
},
{
"version": "v3",
"created": "Mon, 15 Sep 2008 12:46:01 GMT"
}
] | 2008-09-15T00:00:00 | [
[
"Skoldberg",
"Jonas",
""
],
[
"Lofwander",
"Tomas",
""
],
[
"Shumeiko",
"Vitaly S.",
""
],
[
"Fogelstrom",
"Mikael",
""
]
] | [
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] |
801.3609 | Martin Cordiner PhD | M. A. Cordiner, N. L. J. Cox, C. Trundle, C. J. Evans, I. Hunter, N.
Przybilla, F. Bresolin, F. Salama | Detection of diffuse interstellar bands in M31 | null | null | 10.1051/0004-6361:20079309 | null | astro-ph | null | We investigate the diffuse interstellar band (DIB) spectrum in the
interstellar medium of M31. The DEIMOS spectrograph of the W. M. Keck
observatory was used to make optical spectroscopic observations of two
supergiant stars, MAG 63885 and MAG 70817, in the vicinity of the OB78
association in M31 where the metallicity is approximately equal to solar. The
5780, 5797, 6203, 6283 and 6613 DIBs are detected in both sightlines at
velocities matching the M31 interstellar Na I absorption. The spectra are
classified and interstellar reddenings are derived for both stars. Diffuse
interstellar band (DIB) equivalent widths and radial velocities are presented.
The spectrum of DIBs observed in M31 towards MAG 63885 is found to be similar
to that observed in the Milky Way. Towards MAG 70817 the DIB equivalent widths
per unit reddening are about three times the Galactic average. Compared to
observations elsewhere in the Universe, relative to reddening the M31 ISM in
the vicinity of OB78 is apparently a highly favourable environment for the
formation of DIB carriers.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:10:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cordiner",
"M. A.",
""
],
[
"Cox",
"N. L. J.",
""
],
[
"Trundle",
"C.",
""
],
[
"Evans",
"C. J.",
""
],
[
"Hunter",
"I.",
""
],
[
"Przybilla",
"N.",
""
],
[
"Bresolin",
"F.",
""
],
[
"Salama",
"F.",
""
]
] | [
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] |
801.361 | Gwyneth Stallard | P.J.Rippon and G.M.Stallard | Functions of small growth with no unbounded Fatou components | null | null | null | null | math.CV math.DS | null | We prove a form of the $\cos \pi \rho$ theorem which gives strong estimates
for the minimum modulus of a transcendental entire function of order zero. We
also prove a generalisation of a result of Hinkkanen that gives a sufficient
condition for a transcendental entire function to have no unbounded Fatou
components. These two results enable us to show that there is a large class of
entire functions of order zero which have no unbounded Fatou components. On the
other hand we give examples which show that there are in fact functions of
order zero which not only fail to satisfy Hinkkanen's condition but also fail
to satisfy our more general condition. We also give a new regularity condition
that is sufficient to ensure that a transcendental entire function of order
less than 1/2 has no unbounded Fatou components. Finally, we observe that all
the conditions given here which guarantee that a transcendental entire function
has no unbounded Fatou components, also guarantee that the escaping set is
connected, thus answering a question of Eremenko for such functions.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:06:06 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Rippon",
"P. J.",
""
],
[
"Stallard",
"G. M.",
""
]
] | [
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] |
801.3611 | Ricardo Weder | Ricardo Weder | The Boundary Conditions for Point Transformed Electromagnetic
Invisibility Cloaks | This final, published, version has been edited, comments have been
added | J. Phys A: Math. Theor. vol 41 (2008) 415401 (17 pp) | 10.1088/1751-8113/41/41/415401 | null | physics.optics math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study point transformed electromagnetic invisibility cloaks
in transformation media that are obtained by transformation from general
anisotropic media. We assume that there are several cloaks located in different
points in space. Our results apply in particular to the first order
invisibility cloaks introduced by Pendry et al. and to the high order
invisibility cloaks introduced by Hendi et al. and by Cai et al.. We identify
the appropriate {\it cloaking boundary conditions} that the solutions of
Maxwell equations have to satisfy at the outside, $\partial K_+$, and at the
inside, $\partial K_-$, of the boundary of the cloaked object $K$. Namely, that
the tangential components of the electric and the magnetic fields have to
vanish at $\partial K_+$ -what is always true- and that the normal components
of the curl of the electric and the magnetic fields have to vanish at $\partial
K_-$. These results are proven requiring that energy be conserved. In the case
of one spherical cloak with a spherically stratified $K$ and a radial current
at $\partial K$ we verify by an explicit calculation that our {\it cloaking
boundary conditions} are satisfied and that cloaking of active devices holds
even if the current is at the boundary of the cloaked object. As we prove our
results for media that are obtained by transformation from general anisotropic
media, our results apply to the cloaking of objects with active and passive
devices contained in general anisotropic media, in particular to objects with
active and passive devices contained inside general crystals.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:06:58 GMT"
},
{
"version": "v2",
"created": "Tue, 16 Sep 2008 20:48:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Weder",
"Ricardo",
""
]
] | [
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] |
801.3612 | Neda Ghofraniha dr | Neda Ghofraniha, Claudio Conti, Giancarlo Ruocco and Francesco Zamponi | Time-dependent Nonlinear Optical Susceptibility of an Out-of-Equilibrium
Soft Material | null | Phys. Rev. Lett. Vol. 102 (3), article 038303 (2009) | 10.1103/PhysRevLett.102.038303 | null | cond-mat.soft physics.flu-dyn physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the time-dependent nonlinear optical absorption of a clay
dispersion (Laponite) in organic dye (Rhodamine B) water solution displaying
liquid-arrested state transition. Specifically, we determine the characteristic
time $\tau_D$ of the nonlinear susceptibility build-up due as to the Soret
effect. By comparing $\tau_D$ with the relaxation time provided by standard
dynamic light scattering measurements we report on the decoupling of the two
collective diffusion times at the two very different length scales during the
aging of the out-of-equilibrium system. With this demonstration experiment we
also show the potentiality of nonlinear optics measurements in the study of the
late stage of arrest in soft materials.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:08:39 GMT"
},
{
"version": "v2",
"created": "Mon, 26 Jan 2009 07:32:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ghofraniha",
"Neda",
""
],
[
"Conti",
"Claudio",
""
],
[
"Ruocco",
"Giancarlo",
""
],
[
"Zamponi",
"Francesco",
""
]
] | [
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] |
801.3613 | Amir Yacoby | S.Foletti, J.Martin, M.Dolev, D.Mahalu, V.Umansky, and A.Yacoby | Dynamic nuclear polarization using a single pair of electrons | null | null | null | null | cond-mat.mes-hall | null | We observe dynamic nuclear polarization in a GaAs double dot system using two
electrons that are never exchanged with the reservoir. By periodically bringing
the system to the mixing point where the singlet and the triplet T+ states are
degenerate, we observe that an excess polarization is built up. Surprisingly,
the pumping procedure is most effective when the total duty cycle equals a
multiple of the Larmor precession time of the Ga and As nuclei. The induced
polarization corresponds to cooling of the underlying nuclear system. The
dependence on the dwell time at the mixing point is found to be non-monotonic.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:13:06 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Foletti",
"S.",
""
],
[
"Martin",
"J.",
""
],
[
"Dolev",
"M.",
""
],
[
"Mahalu",
"D.",
""
],
[
"Umansky",
"V.",
""
],
[
"Yacoby",
"A.",
""
]
] | [
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] |
801.3614 | Sergio Mart\'in | S. Martin, M.A. Requena-Torres, J. Martin-Pintado, R. Mauersberger | Tracing shocks and photodissociation in the Galactic center region | 25 pages, 5 figures, Accepted for publication in ApJ | null | 10.1086/533409 | null | astro-ph | null | We present a systematic study of the HNCO, C18O, 13CS, and C34S emission
towards 13 selected molecular clouds in the Galactic center region. The
molecular emission in these positions are used as templates of the different
physical and chemical processes claimed to be dominant in the circumnuclear
molecular gas of galaxies. The relative abundance of HNCO shows a variation of
more than a factor of 20 amo ng the observed sources. The HNCO/13CS abundance
ratio is highly contrasted (up to a factor of 30) between the shielded
molecular clouds mostly affected by shocks, where HNCO is released to gas-phase
from grain mantles, and those pervaded by an intense UV radiation field, where
HNCO is photo-dissociated and CS production favored via ion reactions. We
propose the relative HNCO to CS abundance ratio as a highly contrasted
diagnostic tool to distinguish between the influence of shocks and/or the
radiation field in the nuclear regions of galaxies and their relation to the
evolutionary state of their nuclear star formation bursts.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 19:56:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Martin",
"S.",
""
],
[
"Requena-Torres",
"M. A.",
""
],
[
"Martin-Pintado",
"J.",
""
],
[
"Mauersberger",
"R.",
""
]
] | [
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0.0970536917,
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] |
801.3615 | Frederic Herau | Frederic Herau (LM-Reims), Michael Hitrik, Johannes Sjoestrand
(CMLS-EcolePolytechnique) | Tunnel effect for Kramers-Fokker-Planck type operators: return to
equilibrium and applications | null | null | null | null | math.AP math.SP | null | In the first part of this work, we consider second order supersymmetric
differential operators in the semiclassical limit, including the
Kramers-Fokker-Planck operator, such that the exponent of the associated
Maxwellian $\phi$ is a Morse function with two local minima and one saddle
point. Under suitable additional assumptions of dynamical nature, we establish
the long time convergence to the equilibrium for the associated heat semigroup,
with the rate given by the first non-vanishing, exponentially small,
eigenvalue. In the second part of the paper, we consider the case when the
function $\phi$ has precisely one local minimum and one saddle point. We also
discuss further examples of supersymmetric operators, including the Witten
Laplacian and the infinitesimal generator for the time evolution of a chain of
classical anharmonic oscillators.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:16:22 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Herau",
"Frederic",
"",
"LM-Reims"
],
[
"Hitrik",
"Michael",
"",
"CMLS-EcolePolytechnique"
],
[
"Sjoestrand",
"Johannes",
"",
"CMLS-EcolePolytechnique"
]
] | [
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] |
801.3616 | Pedro Fernando Simoes Costa | Pedro Costa, C. A. de Sousa, M. C. Ruivo, H. Hansen | The QCD critical end point in the PNJL model | 12 pages, 3 figures, EPL version | Europhys.Lett.86:31001,2009 | 10.1209/0295-5075/86/31001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the role played by the Polyakov loop in the dynamics of the
chiral phase transition in the framework of the so-called PNJL model in the
SU(2)sector. We present the phase diagram where the inclusion of the Polyakov
loop moves the critical points to higher temperatures, compared with the NJL
model results. The critical properties of physical observables, such as the
baryon number susceptibility and the specific heat, are analyzed in the
vicinity of the critical end point, with special focus on their critical
exponents. The results with the PNJL model are closer to lattice results and we
also recover the universal behavior of the critical exponents of both the
baryon susceptibility and the specific heat.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:17:35 GMT"
},
{
"version": "v2",
"created": "Sat, 11 Jul 2009 14:52:09 GMT"
}
] | 2009-08-03T00:00:00 | [
[
"Costa",
"Pedro",
""
],
[
"de Sousa",
"C. A.",
""
],
[
"Ruivo",
"M. C.",
""
],
[
"Hansen",
"H.",
""
]
] | [
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-0.0716645122,
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0.0250367951,
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-0.0004427826,
-0.0689174533,
0.0253018625
] |
801.3617 | Jean-Marie Lescure | Claire Debord, Jean-Marie Lescure | Index theory and Groupoids | null | Geometric and Tological methods for quantum fields theory, H.
Ocampo, E. Pariguan, S. Paycha (Ed.) (2010) 86-158 | null | null | math.OA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper collects the notes of a serie of lectures given by the two authors
during the summer school "Geometric and topological methods for Quantum Field
Theory" at Villa de Leyva, Colombia, summer 2007. These lecture notes are
mainly devoted to a proof using groupoids and $KK$-theory of Atiyah-Singer
index theorem on compact smooth manifolds. We will present an elementary
introduction to groupoids, $C^*$-algebras, $KK$-theory and pseudodifferential
calculus on groupoids. We will finish by showing that the point of view adopted
here generalizes to the case of conical pseudo-manifolds.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:19:10 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Sep 2008 09:48:21 GMT"
}
] | 2010-05-18T00:00:00 | [
[
"Debord",
"Claire",
""
],
[
"Lescure",
"Jean-Marie",
""
]
] | [
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] |
801.3618 | Pedro Jimenez-Delgado | M. Gl\"uck, P. Jimenez-Delgado, E. Reya, C. Schuck | On the role of heavy flavor parton distributions at high energy
colliders | 10 pages, 1 table, 5 figures | Phys.Lett.B664:133-138,2008 | 10.1016/j.physletb.2008.04.063 | DO-TH 08/01 | hep-ph | null | We compare `fixed flavor number scheme' (FFNS) and `variable flavor number
scheme' (VFNS) parton model predictions at high energy colliders. Based on our
recent LO- and NLO-FFNS dynamical parton distributions, we generate radiatively
two sets of VFNS parton distributions where also the heavy quark flavors
h=c,b,t are considered as massless partons within the nucleon. By studying the
role of these distributions in the production of heavy particles (h\bar{h},
t\bar{b}, hW^{+-}, Higgs--bosons, etc.) at high energy ep, p\bar{p} and pp
colliders, we show that the VFNS predictions are compatible with the FFNS ones
(to within about 10-20% at LHC, depending on the process) when the invariant
mass of the produced system far exceeds the mass of the participating heavy
quark flavor.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:20:48 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Apr 2008 14:51:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Glück",
"M.",
""
],
[
"Jimenez-Delgado",
"P.",
""
],
[
"Reya",
"E.",
""
],
[
"Schuck",
"C.",
""
]
] | [
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] |
801.3619 | Francois Lallet | F. Lallet, A. Dauger, N. Olivi-Tran | Comparison between models of insulator and semiconductor thin films
islanding | 5 pages, 2 figures, published in physica status solidi (c) | Phys. stat. sol. (c) 4, No.3, 1189-1192 (2007) | 10.1002/pssc.200673714 | null | cond-mat.mtrl-sci cond-mat.other | null | The synthesis of self-organized quantum dots (QD's) can be achieved through
bottom up layer by layer deposition processes as chemical vapor deposition
(CVD) or physical vapor deposition (PVD). However, QD's may also be synthesized
via sol-gel route, which involves a spontaneous evolution from thin films to
discrete QD's without further deposition. The aim of the paper is to discuss
and compare the physical phenomena involved in QD's formation which initiate
from thin film surface roughening between PVD-CVD and sol-gel synthesis
approaches. We propose two simple physical models which are relevant to explain
the fundamental differences between those methods.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:21:01 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Lallet",
"F.",
""
],
[
"Dauger",
"A.",
""
],
[
"Olivi-Tran",
"N.",
""
]
] | [
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] |
801.362 | Hannes H\"ubel | Hannes H\"ubel, Michael R. Vanner, Thomas Lederer, Bibiane
Blauensteiner, Thomas Lor\"unser, Andreas Poppe, and Anton Zeilinger | High-fidelity transmission of polarization encoded qubits from an
entangled source over 100 km of fiber | 7 pages, 4 figures | Optics Express, Vol. 15, Issue 12, pp. 7853-7862 (2007) | null | null | quant-ph | null | We demonstrate non-degenerate down-conversion at 810 and 1550 nm for
long-distance fiber based quantum communication using polarization entangled
photon pairs. Measurements of the two-photon visibility, without dark count
subtraction, have shown that the quantum correlations (raw visibility 89%)
allow secure quantum cryptography after 100 km of non-zero dispersion shifted
fiber using commercially available single photon detectors. In addition,
quantum state tomography has revealed little degradation of state negativity,
decreasing from 0.99 at the source to 0.93 after 100 km, indicating minimal
loss in fidelity during the transmission.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:34:09 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Hübel",
"Hannes",
""
],
[
"Vanner",
"Michael R.",
""
],
[
"Lederer",
"Thomas",
""
],
[
"Blauensteiner",
"Bibiane",
""
],
[
"Lorünser",
"Thomas",
""
],
[
"Poppe",
"Andreas",
""
],
[
"Zeilinger",
"Anton",
""
]
] | [
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801.3621 | Jens Mund | Jens Mund | The Spin-Statistics Theorem for Anyons and Plektons in d=2+1 | 21 pages, 2 figures. Citation added; Minor modifications of Appendix
A | Commun.Math.Phys.286:1159-1180,2009 | 10.1007/s00220-008-0628-9 | null | math-ph hep-th math.MP | null | We prove the spin-statistics theorem for massive particles obeying braid
group statistics in three-dimensional Minkowski space. We start from first
principles of local relativistic quantum theory. The only assumption is a gap
in the mass spectrum of the corresponding charged sector, and a restriction on
the degeneracy of the corresponding mass.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:32:47 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Apr 2008 12:20:08 GMT"
}
] | 2009-02-19T00:00:00 | [
[
"Mund",
"Jens",
""
]
] | [
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801.3622 | Pavel Denissenkov | Pavel A. Denissenkov (1 and 2), Marc Pinsonneault (1), and Keith B.
MacGregor (3) ((1) The Ohio State University, (2) On leave from St.
Petersburg State University, (3) High Altitude Observatory) | What Prevents Internal Gravity Waves From Disturbing the Solar Uniform
Rotation? | 33 pages, 8 figures, submitted to ApJ | null | 10.1086/589502 | null | astro-ph | null | Internal gravity waves (IGWs) are naturally produced by convection in stellar
envelopes, and they could be an important mechanism for transporting angular
momentum in the radiative interiors of stars. Prior work has established that
they could operate over a short enough time scale to explain the internal solar
rotation as a function of depth. We demonstrate that the natural action of IGWs
is to produce large scale oscillations in the solar rotation as a function of
depth, which is in marked contrast to the nearly uniform rotation in the outer
radiative envelope of the Sun. An additional angular momentum transport
mechanism is therefore required, and neither molecular nor shear-induced
turbulent viscosity is sufficient to smooth out the profile. Magnetic
processes, such as the Tayler-Spruit dynamo, could flatten the rotation
profile. We therefore conclude that IGWs must operate in conjunction with
magnetic angular momentum transport processes if they operate at all.
Furthermore, both classes of mechanisms must be inhibited to some degree by
mean molecular weight gradients in order to explain the recent evidence for a
rapidly rotating embedded core in the Sun.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:34:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Denissenkov",
"Pavel A.",
"",
"1 and 2"
],
[
"Pinsonneault",
"Marc",
""
],
[
"MacGregor",
"Keith B.",
""
]
] | [
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] |
801.3623 | Serban Protopopescu | V.M. Abazov, et al (for the D0 Collaboration) | Erratum to Measurement of $\sigma (p \bar p \to Z) \cdot Br(Z \to
\tau\tau)$ at $\bm{\sqrt{s}=}$1.96 TeV, published in Phys. Rev. D {71},
072004 (2005) | null | Erratum-ibid.D77:039901,2008 | 10.1103/PhysRevLett.100.139901 | null | hep-ex | null | A change in estimated integrated luminosity (from 226 pb$^{-1} to 257
pb$^{-1}$ leads to a corrected value for ${\sigma (p \bar p \to Z)
\cdot}$Br${(Z \to \tau \tau)}$ of $209\pm13(stat.)\pm16(syst.)\pm13(lum) pb.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:38:14 GMT"
}
] | 2019-08-14T00:00:00 | [
[
"Abazov",
"V. M.",
""
]
] | [
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] |
801.3624 | Anil Ada | Arkadev Chattopadhyay and Anil Ada | Multiparty Communication Complexity of Disjointness | 15 pages, 2 figures | null | null | null | cs.CC | null | We obtain a lower bound of n^Omega(1) on the k-party randomized communication
complexity of the Disjointness function in the `Number on the Forehead' model
of multiparty communication when k is a constant. For k=o(loglog n), the bounds
remain super-polylogarithmic i.e. (log n)^omega(1). The previous best lower
bound for three players until recently was Omega(log n).
Our bound separates the communication complexity classes NP^{CC}_k and
BPP^{CC}_k for k=o(loglog n). Furthermore, by the results of Beame, Pitassi and
Segerlind \cite{BPS07}, our bound implies proof size lower bounds for
tree-like, degree k-1 threshold systems and superpolynomial size lower bounds
for Lovasz-Schrijver proofs.
Sherstov \cite{She07b} recently developed a novel technique to obtain lower
bounds on two-party communication using the approximate polynomial degree of
boolean functions. We obtain our results by extending his technique to the
multi-party setting using ideas from Chattopadhyay \cite{Cha07}.
A similar bound for Disjointness has been recently and independently obtained
by Lee and Shraibman.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:39:31 GMT"
},
{
"version": "v2",
"created": "Sat, 26 Jan 2008 17:39:19 GMT"
},
{
"version": "v3",
"created": "Wed, 20 Feb 2008 23:04:00 GMT"
}
] | 2008-02-21T00:00:00 | [
[
"Chattopadhyay",
"Arkadev",
""
],
[
"Ada",
"Anil",
""
]
] | [
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] |
801.3625 | Al\'an Aspuru-Guzik | Alejandro Perdomo, Colin Truncik, Ivan Tubert-Brohman, Geordie Rose,
Al\'an Aspuru-Guzik | On the construction of model Hamiltonians for adiabatic quantum
computation and its application to finding low energy conformations of
lattice protein models | 35 pages, 8 figures | null | 10.1103/PhysRevA.78.012320 | null | quant-ph | null | In this report, we explore the use of a quantum optimization algorithm for
obtaining low energy conformations of protein models. We discuss mappings
between protein models and optimization variables, which are in turn mapped to
a system of coupled quantum bits. General strategies are given for constructing
Hamiltonians to be used to solve optimization problems of
physical/chemical/biological interest via quantum computation by adiabatic
evolution. As an example, we implement the Hamiltonian corresponding to the
Hydrophobic-Polar (HP) model for protein folding. Furthermore, we present an
approach to reduce the resulting Hamiltonian to two-body terms gearing towards
an experimental realization.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:43:53 GMT"
},
{
"version": "v2",
"created": "Fri, 16 May 2008 13:58:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Perdomo",
"Alejandro",
""
],
[
"Truncik",
"Colin",
""
],
[
"Tubert-Brohman",
"Ivan",
""
],
[
"Rose",
"Geordie",
""
],
[
"Aspuru-Guzik",
"Alán",
""
]
] | [
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801.3626 | Alexander I. Suciu | Stefan Papadima, Alexander I. Suciu | Toric complexes and Artin kernels | 34 pages | Advances in Mathematics 220 (2009), no. 2, 441-477 | 10.1016/j.aim.2008.09.008 | null | math.AT math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simplicial complex L on n vertices determines a subcomplex T_L of the
n-torus, with fundamental group the right-angled Artin group G_L. Given an
epimorphism \chi\colon G_L\to \Z, let T_L^\chi be the corresponding cover, with
fundamental group the Artin kernel N_\chi. We compute the cohomology jumping
loci of the toric complex T_L, as well as the homology groups of T_L^\chi with
coefficients in a field \k, viewed as modules over the group algebra \k\Z. We
give combinatorial conditions for H_{\le r}(T_L^\chi;\k) to have trivial
\Z-action, allowing us to compute the truncated cohomology ring, H^{\le
r}(T_L^\chi;\k). We also determine several Lie algebras associated to Artin
kernels, under certain triviality assumptions on the monodromy \Z-action, and
establish the 1-formality of these (not necessarily finitely presentable)
groups.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 16:55:58 GMT"
},
{
"version": "v2",
"created": "Sun, 21 Dec 2008 13:26:42 GMT"
}
] | 2008-12-21T00:00:00 | [
[
"Papadima",
"Stefan",
""
],
[
"Suciu",
"Alexander I.",
""
]
] | [
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801.3627 | Vicent Mateu | V. Mateu | Universal Bounds for SU(3) Low Energy Constants | 6 pages, 1 figure. Two references added. Some minor changes.
Published version | Phys.Rev.D77:094020,2008 | 10.1103/PhysRevD.77.094020 | IFIC/08-02, FTUV/07-0124 | hep-ph | null | In this paper bounds for L_1, L_2 and L_3 are obtained in Chiral Perturbation
Theory with three flavours. At the same time we test the compatibility of this
theory with axiomatic principles. Following a recent paper we use dispersion
relations to write positivity conditions that translate into bounds for the
chiral low energy constants. As a first approach we consider the exact SU(3)_V
limit and notice that if a common mass of the order of that of the kaon is
adopted for the octet of pseudo-Goldstone bosons the bounds have very large
O(p^6) corrections. Once the positivity conditions are adapted to account for
different masses, we correct the previous bounds for a physical kaon mass and
find that they tighten. We observe an overlap between the experimentally
determined region and the first principles forbidden region, in the space of
parameters.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 17:12:09 GMT"
},
{
"version": "v2",
"created": "Mon, 26 May 2008 13:45:38 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mateu",
"V.",
""
]
] | [
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801.3628 | Simone Pigolotti | Simone Pigolotti and Angelo Vulpiani | Coarse graining of master equations with fast and slow states | 9 pages, 9 figures, final version (new subsection and many minor
improvements) | J. Chem. Phys. 128, 154114 (2008) | 10.1063/1.2907242 | null | cond-mat.soft cond-mat.stat-mech q-bio.QM | null | We propose a general method for simplifying master equations by eliminating
from the description rapidly evolving states. The physical recipe we impose is
the suppression of these states and a renormalization of the rates of all the
surviving states. In some cases, this decimation procedure can be analytically
carried out and is consistent with other analytical approaches, like in the
problem of the random walk in a double-well potential. We discuss the
application of our method to nontrivial examples: diffusion in a lattice with
defects and a model of an enzymatic reaction outside the steady state regime.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 17:14:31 GMT"
},
{
"version": "v2",
"created": "Sun, 20 Apr 2008 13:55:55 GMT"
}
] | 2008-04-20T00:00:00 | [
[
"Pigolotti",
"Simone",
""
],
[
"Vulpiani",
"Angelo",
""
]
] | [
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] |
801.3629 | Pietro Poggi-Corradini | Robert B. Burckel, Donald E. Marshall, David Minda, Pietro
Poggi-Corradini, Thomas J. Ransford | Area, capacity and diameter versions of Schwarz's Lemma | null | null | null | null | math.CV math.CA | null | The now canonical proof of Schwarz's Lemma appeared in a 1907 paper of
Carath\'eodory, who attributed it to Erhard Schmidt. Since then, Schwarz's
Lemma has acquired considerable fame, with multiple extensions and
generalizations. Much less known is that, in the same year 1907, Landau and
Toeplitz obtained a similar result where the diameter of the image set takes
over the role of the maximum modulus of the function. We give a new proof of
this result and extend it to include bounds on the growth of the maximum
modulus. We also develop a more general approach in which the size of the image
is estimated in several geometric ways via notions of radius, diameter,
perimeter, area, capacity, etc...
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 17:30:36 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Burckel",
"Robert B.",
""
],
[
"Marshall",
"Donald E.",
""
],
[
"Minda",
"David",
""
],
[
"Poggi-Corradini",
"Pietro",
""
],
[
"Ransford",
"Thomas J.",
""
]
] | [
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] |
801.363 | Roberto Caimmi | R. Caimmi, T. Valentinuzzi | Two-component, ideal, self-gravitating fluids: the fractional virial
potential energy | 46 pages, 2 tables, and 4 figures. Some typos corrected. Section 5
improved, with one additional figure and additional references | SerAJ 177 (2008) 15-38 | 10.2298/SAJ0877015C | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two-component, ideal, self-gravitating fluids are conceived as macrogases,
and the related equation of state is expressed using the virial theorem for
subsystems, under the restriction of homeoidally striated density profiles.
Shallower density profiles are found to yield an equation of state,
\phi=\phi(y,m), characterized (for assigned values of the fractional mass,
m=M_j/ M_i) by the occurrence of two extremum points, a minimum and a maximum.
Steeper density profiles produce a similar equation of state, which implies
that a special value of m is related to a critical curve where the above
mentioned extremum points reduce to a single horizontal inflexion point, and
curves below the critical one show no extremum points. The similarity of the
isofractional mass curves to van der Waals' isothermal curves, suggests the
possibility of a phase transition in a bell-shaped region of the (O y \phi)
plane, where the fractional truncation radius along a selected direction is
y=R_j/R_i, and the fractional virial potential energy is
\phi=(E_{ji})_{vir}/(E_{ij})_{vir}. Further investigation is devoted to mass
distributions described by Hernquist (1990) density profiles, for which an
additional relation can be used to represent a sample of N=16 elliptical
galaxies (EGs) on the (O y \phi) plane, under the assumption that the
fractional mass related to EGs and their hosting dark matter (DM) haloes, has a
universal value. In the light of the model, the evolution of isolated EGs
appears to be other than strictly homologous, due to different values of
fractional truncation radii, y, or fractional scaling radii, y^\dagger, deduced
from sample objects.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 18:13:01 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jun 2008 08:13:04 GMT"
}
] | 2009-02-19T00:00:00 | [
[
"Caimmi",
"R.",
""
],
[
"Valentinuzzi",
"T.",
""
]
] | [
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] |
801.3631 | Sergey Skipetrov | S.E. Skipetrov, A. Minguzzi, B.A. van Tiggelen, B. Shapiro | Anderson localization of a Bose-Einstein condensate in a 3D random
potential | 4 pages, 2 figures | Phys. Rev. Lett. 100, 165301 (2008) | 10.1103/PhysRevLett.100.165301 | null | cond-mat.dis-nn cond-mat.mes-hall | null | We study the effect of Anderson localization on the expansion of a
Bose-Einstein condensate, released from a harmonic trap, in a 3D random
potential. We use scaling arguments and the self-consistent theory of
localization to show that the long-time behavior of the condensate density is
controlled by a single parameter equal to the ratio of the mobility edge and
the chemical potential of the condensate. We find that the two critical
exponents of the localization transition determine the evolution of the
condensate density in time and space.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 17:46:26 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Mar 2008 17:29:07 GMT"
}
] | 2008-04-28T00:00:00 | [
[
"Skipetrov",
"S. E.",
""
],
[
"Minguzzi",
"A.",
""
],
[
"van Tiggelen",
"B. A.",
""
],
[
"Shapiro",
"B.",
""
]
] | [
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801.3632 | Waldyr A. Rodrigues Jr. | Waldyr A. Rodrigues Jr | Killing Vector Fields, Maxwell Equations and Lorentzian Spacetimes | In this version some misprints,typos and an incorrect statement have
been corrected. The text has been presented at the 8th International
Conference on Clifford Algebras and their Applications in Matthematical
Physics (ICCA8), Campinas 26-30 May 2008 | Adv.Appl.Clifford Algebras 20:871-884,2010 | 10.1007/s00006-010-0226-8 | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we first analyze the structure of Maxwell equations in a
Lorentzian spacetime where the potential A is proportional to 1-form K
physically equivalent to a Killing vector field (supposed to exist). We show
that such A obeys the Lorenz gauge and also a wave equation that can be written
in terms of the covariant D'Alembertian or the Ricci operator. Moreover, we
determine the correct current defined by that potential showing that it is of
superconducting type, being two times the product of the components of A by the
Ricci 1-form fields. We also study the structure of the spacetime generated by
the coupled system consisting of a electromagnetic field F = dA (A, as above),
an ideal charged fluid with dynamics described by an action function S and the
gravitational field. We show that Einstein equations in this situation is then
equivalent to Maxwell equations with a current givn by fFAF (the product
meaning the Clifford product of the corresponding form fields), where f is a
scalar function which satisfies a well determined algebraic quadratic equation.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 17:56:36 GMT"
},
{
"version": "v2",
"created": "Sat, 26 Jan 2008 22:20:57 GMT"
},
{
"version": "v3",
"created": "Sun, 1 Jun 2008 12:18:26 GMT"
},
{
"version": "v4",
"created": "Tue, 12 Aug 2008 16:54:38 GMT"
},
{
"version": "v5",
"created": "Wed, 13 Aug 2008 19:50:01 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Rodrigues",
"Waldyr A.",
"Jr"
]
] | [
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] |
801.3633 | Steen Ryom-Hansen | Steen Ryom-Hansen | On the Representation Theory of an Algebra of Braids and Ties | 24 pages. Final version. To appear in Journal of Algebraic
Combinatorics. | null | null | null | math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the algebra ${\cal E}_n(u)$ introduced by F. Aicardi and J.
Juyumaya as an abstraction of the Yokonuma-Hecke algebra. We construct a tensor
space representation for ${\cal E}_n(u)$ and show that this is faithful. We use
it to give a basis for ${\cal E}_n(u)$ and to classify its irreducible
representations.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 17:58:25 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Jun 2008 17:52:10 GMT"
},
{
"version": "v3",
"created": "Mon, 4 May 2009 16:30:25 GMT"
},
{
"version": "v4",
"created": "Mon, 19 Apr 2010 21:35:24 GMT"
}
] | 2010-04-21T00:00:00 | [
[
"Ryom-Hansen",
"Steen",
""
]
] | [
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] |
801.3634 | David Crampton | David Crampton, Luc Simard and David Silva (TMT Project Office) | TMT Science and Instruments | 7 pages, to appear in the proceedings of the ESO Workshop "Science
with the VLT in the ELT Era", October 2007 | null | 10.1007/978-1-4020-9190-2_47 | null | astro-ph | null | To meet the scientific goals of the Thirty Meter Telescope Project, full
diffraction-limited performance is required from the outset and hence the
entire observatory is being designed, as a system, to achieve this. The
preliminary design phases of the telescope and the first light adaptive optic
facility are now approaching completion so that much better predictions of the
system performance are possible. The telescope design and instrumentation are
summarized in this presentation, with a brief description of some of the
scientific programs that are foreseen.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 17:59:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Crampton",
"David",
"",
"TMT Project Office"
],
[
"Simard",
"Luc",
"",
"TMT Project Office"
],
[
"Silva",
"David",
"",
"TMT Project Office"
]
] | [
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] |
801.3635 | Alberto Mart\'inez Torres | A. Mart\'inez Torres, K. P. Khemchandani, L. S. Geng, M. Napsuciale,
and E. Oset | X(2175) as a resonant state of the $\phi K \bar{K}$ system | version accepted for publication | Phys.Rev.D78:074031,2008 | 10.1103/PhysRevD.78.074031 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a Faddeev calculation for the three mesons system, $\phi K
\bar{K}$, taking the interaction between two pseudoscalar mesons and between a
vector and a pseudoscalar meson from the chiral unitary approach. We obtain a
neat resonance peak around a total mass of 2150 MeV and an invariant mass for
the $K \bar{K}$ system around 970 MeV, very close to the $f_0(980)$ mass. The
state appears in I=0 and qualifies as a $\phi f_0(980)$ resonance. We enlarge
the space of states including $\phi \pi \pi$, since $\pi \pi$ and $K \bar{K}$
build up the $f_0$ (980), and find moderate changes that serve to quantify
theoretical uncertainties. No state is seen in I=1. This finding provides a
natural explanation for the recent state found at BABAR and BES, the X(2175),
which decays into $\phi f_0(980)$.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 18:14:15 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Apr 2008 17:38:17 GMT"
},
{
"version": "v3",
"created": "Tue, 4 Nov 2008 19:07:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Torres",
"A. Martínez",
""
],
[
"Khemchandani",
"K. P.",
""
],
[
"Geng",
"L. S.",
""
],
[
"Napsuciale",
"M.",
""
],
[
"Oset",
"E.",
""
]
] | [
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] |
801.3636 | Jean-Francois Lafont | S. Francaviglia, J.-F. Lafont | Asymptotic cones, bi-Lipschitz ultraflats, and the geometric rank of
geodesics | 35 pages, 7 figures; modified file to orient graphics correctly | null | null | null | math.DG math.GT math.MG | null | Given a geodesic inside a simply-connected, complete, non-positively curved
Riemannian (NPCR) manifold M, we get an associated geodesic inside the
asymptotic cone Cone(M). Under mild hypotheses, we show that if the latter is
contained inside a bi-Lipschitz flat, then the original geodesic supports a
non-trivial, orthogonal, parallel Jacobi field. As applications we obtain (1)
constraints on the behavior of quasi-isometries between complete, simply
connected, NPCR manifolds, and (2) constraints on the NPCR metrics supported by
certain manifolds, and (3) a correspondence between metric splittings of
complete, simply connected NPCR manifolds, and metric splittings of its
asymptotic cones. Furthermore, combining our results with the
Ballmann-Burns-Spatzier rigidity theorem and the classic Mostow rigidity, we
also obtain (4) a new proof of Gromov's rigidity theorem for higher rank
locally symmetric spaces.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 18:15:17 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 17:13:15 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Francaviglia",
"S.",
""
],
[
"Lafont",
"J. -F.",
""
]
] | [
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] |
801.3637 | Sophie Pireaux Dr | S. Pireaux (1), B. Chauvineau (2), A. Hees (1) ((1) Observatoire Royal
de Belgique, Department 1, Brussels, Belgium; (2) Observatoire de la Cote
d'Azur, Department ARTEMIS, Grasse, France.) | Relativistic versus Newtonian orbit model: the Relativistic Motion
Integrator (RMI) software. Illustration with the LISA mission | 30 p., 17 figs, 0 table, submitted to Celestial Mechanics. Changes
made according to referee's comments: info provided on LISA TDI simulators,
new coauthor and annex on "Numerical estimate of the Christoffel Symbols",
additionnal references and other minor changes | null | null | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Relativistic Motion Integrator (RMI) consists in integrating numerically
the EXACT relativistic equations of motion, for a given metric (corresponding
to a gravitational field at first post-Newtonian order or higher), instead of
Newtonian equations plus relativistic corrections. The aim of the present paper
is to validate the method, and to illustrate how RMI can be used for space
missions to produce relativistic ephemerides of test-bodies (or satellites).
Indeed, nowadays, relativistic effects have to be taken into account, and
comparing a RMI model with a classical keplerian one helps to quantify such
effects.
LISA is a relevant example to use RMI. A precise orbit model for the LISA
spacecraft is needed not only for the sake of satellite ephemerides but also to
compute the photon flight time in laser links between spacecraft, required in
LISA data pre-processing in order to reach the gravitational wave detection
level.
Relativistic effects in LISA orbit model needed to be considered and
quantified. Using RMI, we show that the numerical classical model for LISA
orbits in the gravitational field of a non-rotating spherical Sun without
planets can be wrong, with respect to the numerical relativisitic version of
the same model, by as much as about ten kilometers in radial distance during a
year and up to about 60 kilometers in along track distance after a year... with
consequences on estimated photon flight times.
We validated RMI numerical results with a 1PN analytical developpement.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 18:16:06 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Aug 2009 08:32:23 GMT"
}
] | 2012-07-04T00:00:00 | [
[
"Pireaux",
"S.",
""
],
[
"Chauvineau",
"B.",
""
],
[
"Hees",
"A.",
""
]
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] |
801.3638 | Styliani Kafka | S. Kafka, R. Anderson and R.K. Honeycutt | QU Carinae: a SNeIa progenitor? | Accepted in the Astronomical Journal. 11 pages, 3 tables, 5 figures | null | 10.1088/0004-6256/135/4/1649 | null | astro-ph | null | Optical spectra obtained in 2006-07 of the nova-like cataclysmic variable QU
Car are studied for radial velocities, line profiles, and line identifications.
We are not able to confirm the reported 10.9 hr orbital period from 1982,partly
because our sampling is not ideal for this purpose and also, we suspect,
because our radial velocities are distorted by line profile changes due to an
erratic wind. P-Cygni profiles are found in several of the emission lines,
including those of C IV. Carbon lines are abundant in the spectra, suggesting a
carbon enrichment in the doner star. The presence of [O III] 5007\AA and [N II]
6584\AA is likely due to a diffuse nebula in the vicinity of the system.
The wind signatures in the spectra and the presence of nebular lines are in
agreement with the accretion wind evolution scenario that has been suggested to
lead to SNeIa. We argue that QU Car is a member of the V Sge subclass of CVs,
and a possible SNeIa progenitor. It is shown that the recent light curve of QU
Car has ~1 mag low states, similar to the light curve of V Sge, strengthening
the connection of QU Car with V Sge stars, supersoft x-ray sources, and SNeIa
progenitors.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 18:17:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kafka",
"S.",
""
],
[
"Anderson",
"R.",
""
],
[
"Honeycutt",
"R. K.",
""
]
] | [
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] |
801.3639 | Victor Pambucian | Victor Pambuccian | The sum of irreducible fractions with consecutive denominators is never
an integer in a very weak arithmetic | null | null | null | null | math.LO math.NT | null | Two theorems of elmentary arithmetic, one stating that the sum of the
reciprocals of any number of consecutive positive integers is never an integer,
and a generalization thereof by Trygve Nagell, are shown to be provable inside
a very weak arithmetic, Richard Kaye's $PA^-$, in which there is no induction
axiom whatsoever.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 18:18:04 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Pambuccian",
"Victor",
""
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] |
801.364 | Sharon Betz | Sharon Betz and H. Vincent Poor | Energy Efficiency in Multi-Hop CDMA Networks: a Game Theoretic Analysis
Considering Operating Costs | To appear in the Proceedings of the 2008 IEEE International
Conference on Acoustics, Speech and Signal Processing, Las Vegas, NV, March
30 -- April 4, 2008 | null | 10.1109/TSP.2008.929118 | null | cs.IT math.IT | null | A game-theoretic analysis is used to study the effects of receiver choice and
transmit power on the energy efficiency of multi-hop networks in which the
nodes communicate using Direct-Sequence Code Division Multiple Access
(DS-CDMA). A Nash equilibrium of the game in which the network nodes can choose
their receivers as well as their transmit powers to maximize the total number
of bits they transmit per unit of energy spent (including both transmit and
operating energy) is derived. The energy efficiencies resulting from the use of
different linear multiuser receivers in this context are compared for the
non-cooperative game. Significant gains in energy efficiency are observed when
multiuser receivers, particularly the linear minimum mean-square error (MMSE)
receiver, are used instead of conventional matched filter receivers.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 18:24:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Betz",
"Sharon",
""
],
[
"Poor",
"H. Vincent",
""
]
] | [
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] |
801.3641 | Yanzhang He | Yanzhang He, Chengguang Bao | Fractional Aharonov-Bohm oscillation of a two-layer ring with two
electrons | 5 pages, 6 figures, submitted | Eur. Phys. J. B 62 (2008) 465 | 10.1140/epjb/e2008-00184-y | null | cond-mat.other | null | When a circular ring suffers a special topological transformation, it becomes
a two-layer ring. Due to the special topology of the two-layer ring, orbital
angular momenta are allowed to be a half-integer, this would affect the
traditional Aharonov-Bohm oscillation (ABO). In this paper the fractional ABO
of the ground state energy, persistent current, and dipole transition of a
two-layer ring with two electrons has been studied. Collective and internal
coordinates $\theta_{C}$ and $\phi $ have been introduced. Based on them a very
simple formula for the current has been obtained, the symmetry constraint
imposed on the dipole transition has been clarified, a strict relation between
the photon energies of the dipole radiation and the persistent current of the
ground state has been found. Comparing with the one-layer rings, the period of
the fractional ABO of the two-layer rings becomes much shorter.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 18:25:11 GMT"
}
] | 2010-01-10T00:00:00 | [
[
"He",
"Yanzhang",
""
],
[
"Bao",
"Chengguang",
""
]
] | [
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] |
801.3642 | Jessica Metcalf-Burton | Jessica Ruth Metcalf-Burton | Information Rates of Minimal Non-Matroid-Related Access Structures | 8 pages | null | null | null | cs.CR math.CO | null | In a secret sharing scheme, shares of a secret are distributed to
participants in such a way that only certain predetermined sets of participants
are qualified to reconstruct the secret. An access structure on a set of
participants specifies which sets are to be qualified. The information rate of
an access structure is a bound on how efficient a secret sharing scheme for
that access structure can be. Marti-Farre and Padro showed that all access
structures with information rate greater than two-thirds are matroid-related,
and Stinson showed that four of the minor-minimal, non-matroid-related access
structures have information rate exactly two-thirds. By a result of Seymour,
there are infinitely many remaining minor-minimal, non-matroid-related access
structures. In this paper we find the exact information rates for all such
structures.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 18:36:39 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Metcalf-Burton",
"Jessica Ruth",
""
]
] | [
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801.3643 | Benjamin Hutz | Benjamin Hutz | Dynatomic cycles for morphisms of projective varieties | null | null | null | null | math.NT math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the effectivity of the dynatomic cycles for morphisms of projective
varieties. We then analyze the degrees of the dynatomic cycles and
multiplicities of formal periodic points and apply these results to the
existence of periodic points with arbitrarily large primitive periods.
| [
{
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"created": "Wed, 23 Jan 2008 19:03:25 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Oct 2008 13:16:08 GMT"
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] | 2008-10-22T00:00:00 | [
[
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801.3644 | Christopher Farrow | C. L. Farrow and P. Shukla and P. M. Duxbury | Dynamics of k-core percolation | 4 pages, 3 figures | C L Farrow et al 2007 J. Phys. A: Math. Theor. 40 F581-F587 | 10.1088/1751-8113/40/27/F02 | null | cond-mat.stat-mech | null | In many network applications nodes are stable provided they have at least k
neighbors, and a network of k-stable nodes is called a k-core. The
vulnerability to random attack is characterized by the size of culling
avalanches which occur after a randomly chosen k-core node is removed.
Simulations of lattices in two, three and four dimensions, as well as small
world networks, indicate that power-law avalanches occur in first order k-core
systems, while truncated avalanches are characteristic of second order cases.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 18:59:09 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Farrow",
"C. L.",
""
],
[
"Shukla",
"P.",
""
],
[
"Duxbury",
"P. M.",
""
]
] | [
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801.3645 | Benjamin Hutz | Benjamin Hutz | Good Reduction of Periodic Points | to appear Illinois Journal of Math | null | null | null | math.NT math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the dynamical system created by iterating a morphism of a
projective variety defined over the field of fractions of a discrete valuation
ring. We study the primitive period of a periodic point in this field in
relation to the primitive period of the reduced point in the residue field, the
order of the action on the cotangent space, and the characteristic of the
residue field.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 19:15:16 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Mar 2009 16:27:41 GMT"
},
{
"version": "v3",
"created": "Fri, 12 Mar 2010 14:21:59 GMT"
}
] | 2010-03-15T00:00:00 | [
[
"Hutz",
"Benjamin",
""
]
] | [
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] |
801.3646 | Augusto Carballido | Augusto Carballido (JPL), James M. Stone (Princeton), Neal J. Turner
(JPL) | Kinematics of solid particles in a turbulent protoplanetary disc | 11 pages, 9 figures. Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13014.x | null | astro-ph | null | We perform numerical simulations of solid particle motion in a shearing box
model of a protoplanetary disc. The accretion flow is turbulent due to the
action of the magnetorotational instability. Aerodynamic drag on the particles
is modelled using the Epstein law with the gas velocity interpolated to the
particle position. The effect of the magnetohydrodynamic turbulence on particle
velocity dispersions is quantified for solids of different stopping times t_s,
or equivalently, different sizes. The anisotropy of the turbulence is reflected
upon the dispersions of the particle velocity components, with the radial
component larger than both the azimuthal and vertical components for particles
larger than ~ 10 cm (assuming minimum-mass solar nebula conditions at 5 AU).
The dispersion of the particle velocity magnitude, as well as that of the
radial and azimuthal components, as functions of stopping time, agree with
previous analytical results for isotropic turbulence. The relative speed
between pairs of particles with the same value of t_s decays faster with
decreasing separation than in the case of solids with different stopping time.
Correlations in the particle number density introduce a non-uniform spatial
distribution of solids in the 10 to 100 cm size range. Any clump of particles
is disrupted by the turbulence in less than one tenth on an orbital period, and
the maximally concentrated clumps are stable against self-gravitational
collapse.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 19:16:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Carballido",
"Augusto",
"",
"JPL"
],
[
"Stone",
"James M.",
"",
"Princeton"
],
[
"Turner",
"Neal J.",
"",
"JPL"
]
] | [
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] |
801.3647 | Vitaliy Kurlin | Cherry Kearton, Vitaliy Kurlin | All 2-dimensional links in 4-space live inside a universal 3-dimensional
polyhedron | 18 pages, 18 figures, proofs have been made more detailed | Algebr. Geom. Topol. 8 (2008) 1223-1247 | 10.2140/agt.2008.8.1223 | null | math.GT | null | The hexabasic book is the cone of the 1-dimensional skeleton of the union of
two tetrahedra glued along a common face. The universal 3-dimensional
polyhedron UP is the product of a segment and the hexabasic book. We show that
any 2-dimensional link in 4-space is isotopic to a surface in UP. The proof is
based on a representation of surfaces in 4-space by marked graphs, links with
double intersections in 3-space. We construct a finitely presented semigroup
whose central elements uniquely encode all isotopy classes of 2-dimensional
links.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 19:20:02 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Apr 2008 09:08:43 GMT"
}
] | 2014-10-01T00:00:00 | [
[
"Kearton",
"Cherry",
""
],
[
"Kurlin",
"Vitaliy",
""
]
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0.0993876383,
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-0.0289214011,
-0.0353456028,
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0.0594925992,
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0.08898893,
-0.0112985941,
-0.0330208912,
-0.0269216504,
-0.0360955074
] |
801.3648 | Benjamin Hutz | Benjamin Hutz | Finding Rational Periodic Points on Wehler K3 Surfaces | to appear New Zealand Journal of Mathematics | null | null | null | math.NT math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article examines dynamical systems on a class of K3 surfaces in
$\mathbb{P}^{2} \times \mathbb{P}^{2}$ with an infinite automorphism group. In
particular, this article develops an algorithm to find $\mathbb{Q}$-rational
periodic points using information modulo $p$ for various primes $p$. The
algorithm is applied to exhibit K3 surfaces with $\mathbb{Q}$-rational periodic
points of primitive period $1,...,16$. A portion of the algorithm is then used
to determine the Riemann zeta function modulo 3 of a particular K3 surface and
find a family of K3 surfaces with Picard number two.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 19:24:40 GMT"
},
{
"version": "v2",
"created": "Sun, 14 Sep 2008 13:44:19 GMT"
},
{
"version": "v3",
"created": "Fri, 12 Mar 2010 14:30:51 GMT"
}
] | 2015-03-13T00:00:00 | [
[
"Hutz",
"Benjamin",
""
]
] | [
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801.3649 | Domitilla de Martino Dr | D. de Martino, G. Matt, K. Mukai, J.-M. Bonnet-Bidaud, M. Falanga,
B.T. Gaensicke, F. Haberl, T.R. Marsh, M. Mouchet, S.P. Littlefair, V.
Dhillon | 1RXSJ173021.5-055933: a cataclysmic variable with a fast-spinning
magnetic white dwarf | 11 pages, 7 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20078368 | null | astro-ph | null | We present the first X-ray observations with the XMM-Newton and INTEGRAL
satellites of the recently discovered cataclysmic variable
1RXSJ173021.5-055933, together with simultaneous UV and coordinated optical
photometry aiming at characterising its broad-band temporal and spectral
properties and classifying this system as a magnetic one. We find that the
X-ray light curve is dominated by the 128s spin period of the accreting white
dwarf in contrast to the far-UV range, which turns out to be unmodulated at a
3sigma level. Near-UV and optical pulses are instead detected at twice the spin
frequency. We identify the contributions from two accreting poles that imply a
moderately inclined dipole field allowing, one pole to dominate at energies at
least up to 10keV, and a secondary that instead is negligible above 5keV. X-ray
spectral analysis reveals the presence of multiple emission components
consisting of optically thin plasma with temperatures ranging from 0.17keV to
60keV and a hot blackbody at ~90eV. The spectrum is also strongly affected by
peculiar absorption components consisting of two high-density
(~3x10^(21)cm^(-2) and ~2x10^(23)cm^(-2)) intervening columns, plus a warm
absorber. The last is detected from an OVII absorption edge at 0.74keV, which
suggests that photoionization of pre-shock material is also occurring in this
system. The observed properties indicate that the accretor in
1RXSJ173021.5-055933 is a white dwarf with a likely weak magnetic field, thus
confirming this cataclysmic variable as an intermediate polar (IP) with one of
the most extreme spin-to-orbit period ratios. This system also joins the small
group of IPs showing a soft X-ray reprocessed component, suggesting that this
characteristics is not uncommon in these systems.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 19:28:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"de Martino",
"D.",
""
],
[
"Matt",
"G.",
""
],
[
"Mukai",
"K.",
""
],
[
"Bonnet-Bidaud",
"J. -M.",
""
],
[
"Falanga",
"M.",
""
],
[
"Gaensicke",
"B. T.",
""
],
[
"Haberl",
"F.",
""
],
[
"Marsh",
"T. R.",
""
],
[
"Mouchet",
"M.",
""
],
[
"Littlefair",
"S. P.",
""
],
[
"Dhillon",
"V.",
""
]
] | [
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801.365 | Linda J. Tacconi | L.J. Tacconi, R. Genzel, I. Smail, R. Neri, S.C. Chapman, R.J. Ivison,
A. Blain, P.Cox, A. Omont, F. Bertoldi, T. Greve, N.M. Foerster Schreiber, S.
Genel, D. Lutz, A.M. Swinbank, A.E. Shapley, D.K. Erb, A. Cimatti, E. Daddi,
and A.J. Baker | Submillimeter Galaxies at z~2: Evidence for Major Mergers & Constraints
on Lifetimes, IMF and CO-H2 Conversion Factor | 61 pages, 10 figures, Accepted for publication in ApJ | Astrophys.J.680:246-262,2008 | 10.1086/587168 | null | astro-ph | null | We report sub-arcsecond resolution IRAM PdBI millimeter CO interferometry of
four z~2 submillimeter galaxies (SMGs), and sensitive CO (3-2) flux limits
toward three z~2 UV-/optically selected star forming galaxies. The new data
reveal for the first time spatially resolved CO gas kinematics in the observed
SMGs. Two of the SMGs show double or multiple morphologies, with complex,
disturbed gas motions. The other two SMGs exhibit CO velocity gradients of ~500
km/s across 0.2 arcsec (1.6 kpc) diameter regions, suggesting that the star
forming gas is in compact, rotating disks. Our data provide compelling evidence
that these SMGs represent extreme, short-lived 'maximum' star forming events in
highly dissipative mergers of gas rich galaxies. The resulting high mass
surface and volume densities of SMGs are similar to those of compact quiescent
galaxies in the same redshift range, and much higher than those in local
spheroids. From the ratio of the comoving volume densities of SMGs and
quiescent galaxies in the same mass and redshift ranges, and from the
comparison of gas exhaustion time scales and stellar ages, we estimate that the
SMG phase duration is about 100 Myrs. Our analysis of SMGs and optically/UV
selected high redshift star forming galaxies supports a 'universal' Chabrier
IMF as being valid over the star forming history of these galaxies. We find
that the 12CO luminosity to total gas mass conversion factors at z~2-3 are
probably similar to those assumed at z~0. The implied gas fractions in our
sample galaxies range from 20 to 50%.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:23:45 GMT"
}
] | 2010-03-19T00:00:00 | [
[
"Tacconi",
"L. J.",
""
],
[
"Genzel",
"R.",
""
],
[
"Smail",
"I.",
""
],
[
"Neri",
"R.",
""
],
[
"Chapman",
"S. C.",
""
],
[
"Ivison",
"R. J.",
""
],
[
"Blain",
"A.",
""
],
[
"Cox",
"P.",
""
],
[
"Omont",
"A.",
""
],
[
"Bertoldi",
"F.",
""
],
[
"Greve",
"T.",
""
],
[
"Schreiber",
"N. M. Foerster",
""
],
[
"Genel",
"S.",
""
],
[
"Lutz",
"D.",
""
],
[
"Swinbank",
"A. M.",
""
],
[
"Shapley",
"A. E.",
""
],
[
"Erb",
"D. K.",
""
],
[
"Cimatti",
"A.",
""
],
[
"Daddi",
"E.",
""
],
[
"Baker",
"A. J.",
""
]
] | [
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] |
801.3651 | Matthias Kaschube | Matthias Kaschube, Michael Schnabel and Fred Wolf | Self-organization and the selection of pinwheel density in visual
cortical development | 22 pages, 3 figures | null | 10.1088/1367-2630/10/1/015009 | null | q-bio.NC | null | Self-organization of neural circuitry is an appealing framework for
understanding cortical development, yet its applicability remains unconfirmed.
Models for the self-organization of neural circuits have been proposed, but
experimentally testable predictions of these models have been less clear. The
visual cortex contains a large number of topological point defects, called
pinwheels, which are detectable in experiments and therefore in principle well
suited for testing predictions of self-organization empirically. Here, we
analytically calculate the density of pinwheels predicted by a pattern
formation model of visual cortical development. An important factor controlling
the density of pinwheels in this model appears to be the presence of non-local
long-range interactions, a property which distinguishes cortical circuits from
many nonliving systems in which self-organization has been studied. We show
that in the limit where the range of these interactions is infinite, the
average pinwheel density converges to $\pi$. Moreover, an average pinwheel
density close to this value is robustly selected even for intermediate
interaction ranges, a regime arguably covering interaction-ranges in a wide
range of different species. In conclusion, our paper provides the first direct
theoretical demonstration and analysis of pinwheel density selection in models
of cortical self-organization and suggests to quantitatively probe this type of
prediction in future high-precision experiments.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 19:42:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kaschube",
"Matthias",
""
],
[
"Schnabel",
"Michael",
""
],
[
"Wolf",
"Fred",
""
]
] | [
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] |
801.3652 | Emanuel Gluskin | Emanuel Gluskin | The nonlinear-by-switching systems (a heuristic discussion of some basic
singular systems) | 25 pages, 6 figures | null | null | null | nlin.SI | null | Electronics has changed greatly during recent decades, and some its basic
concepts should be revisited. Starting from the sampling procedure, we consider
some mathematical, physical and engineering aspects related to singular, mainly
switching, systems. Since the field of such systems is very rich in content, a
certain line of treatment had to be chosen, making the work a theoretical
introduction to the field of the systems. The focus is on the conditions for a
singular system to be linear or nonlinear, and one studies more deeply what
"nonlinearity" is (can be). In order to uniformly present mathematical,
physical and circuit arguments, the work is given the frame of a discussion in
which the relevant specialists participate.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:15:00 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 17:42:34 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Gluskin",
"Emanuel",
""
]
] | [
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] |
801.3653 | Francesc Ferrer | Craig J. Copi, Francesc Ferrer, Tanmay Vachaspati and Ana Achucarro | Helical Magnetic Fields from Sphaleron Decay and Baryogenesis | 4 pages, 1 figure. Added references, fixed typos | Phys.Rev.Lett.101:171302,2008 | 10.1103/PhysRevLett.101.171302 | null | astro-ph hep-lat hep-ph hep-th | null | Many models of baryogenesis rely on anomalous particle physics processes to
give baryon number violation. By numerically evolving the electroweak equations
on a lattice, we show that baryogenesis in these models creates helical cosmic
magnetic fields. After a transitory period, electroweak dynamics is found to
conserve the Chern-Simons number and the total electromagnetic helicity. We
argue that baryogenesis could lead to magnetic fields of nano-Gauss strength
today on astrophysical length scales. In addition to being astrophysically
relevant, such helical magnetic fields can provide an independent probe of
baryogenesis and CP violation in particle physics.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:22:15 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 20:16:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Copi",
"Craig J.",
""
],
[
"Ferrer",
"Francesc",
""
],
[
"Vachaspati",
"Tanmay",
""
],
[
"Achucarro",
"Ana",
""
]
] | [
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] |
801.3654 | Mikhail Zaslavskiy | Mikhail Zaslavskiy, Francis Bach, and Jean-Philippe Vert | A path following algorithm for the graph matching problem | 23 pages, 13 figures,typo correction, new results in sections 4,5,6 | null | null | null | cs.CV cs.DM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a convex-concave programming approach for the labeled weighted
graph matching problem. The convex-concave programming formulation is obtained
by rewriting the weighted graph matching problem as a least-square problem on
the set of permutation matrices and relaxing it to two different optimization
problems: a quadratic convex and a quadratic concave optimization problem on
the set of doubly stochastic matrices. The concave relaxation has the same
global minimum as the initial graph matching problem, but the search for its
global minimum is also a hard combinatorial problem. We therefore construct an
approximation of the concave problem solution by following a solution path of a
convex-concave problem obtained by linear interpolation of the convex and
concave formulations, starting from the convex relaxation. This method allows
to easily integrate the information on graph label similarities into the
optimization problem, and therefore to perform labeled weighted graph matching.
The algorithm is compared with some of the best performing graph matching
methods on four datasets: simulated graphs, QAPLib, retina vessel images and
handwritten chinese characters. In all cases, the results are competitive with
the state-of-the-art.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:20:32 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Oct 2008 14:16:01 GMT"
}
] | 2008-10-27T00:00:00 | [
[
"Zaslavskiy",
"Mikhail",
""
],
[
"Bach",
"Francis",
""
],
[
"Vert",
"Jean-Philippe",
""
]
] | [
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] |
801.3655 | Maciej Misiorny | Maciej Misiorny and J\'ozef Barna\'s | Effects of Intrinsic Spin-Relaxation in Molecular Magnets on
Current-Induced Magnetic Switching | 4 pages, 4 EPS figures | null | 10.1103/PhysRevB.77.172414 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Current-induced magnetic switching of a single magnetic molecule attached to
two ferromagnetic contacts is considered theoretically, with the main emphasis
put on the role of intrinsic spin relaxation processes. It is shown that
spin-polarized current can switch magnetic moment of the molecule, despite of
the intrinsic spin relaxation in the molecule. The latter processes increase
the threshold voltage (current) above which the switching takes place.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:28:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Misiorny",
"Maciej",
""
],
[
"Barnaś",
"Józef",
""
]
] | [
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] |
801.3656 | Christopher Savage | John Ellis, Keith A. Olive, Christopher Savage | Hadronic Uncertainties in the Elastic Scattering of Supersymmetric Dark
Matter | 25 pages, 10 figures. v2: added references. To appear in PRD | Phys.Rev.D77:065026,2008 | 10.1103/PhysRevD.77.065026 | CERN-PH-TH/2008-005, UMN-TH-2631/08, FTPI-MINN-08/02 | hep-ph astro-ph nucl-ex nucl-th | null | We review the uncertainties in the spin-independent and -dependent elastic
scattering cross sections of supersymmetric dark matter particles on protons
and neutrons. We propagate the uncertainties in quark masses and hadronic
matrix elements that are related to the $\pi$-nucleon $\sigma$ term and the
spin content of the nucleon. By far the largest single uncertainty is that in
spin-independent scattering induced by our ignorance of the $<N | {\bar q} q |
N>$ matrix elements linked to the $\pi$-nucleon $\sigma$ term, which affects
the ratio of cross sections on proton and neutron targets as well as their
absolute values. This uncertainty is already impacting the interpretations of
experimental searches for cold dark matter. {\it We plead for an experimental
campaign to determine better the $\pi$-nucleon $\sigma$ term.} Uncertainties in
the spin content of the proton affect significantly, but less strongly, the
calculation of rates used in indirect searches.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:31:48 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 15:02:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ellis",
"John",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Savage",
"Christopher",
""
]
] | [
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] |
801.3657 | Joe Polchinski | Norihiro Iizuka, Joseph Polchinski | A Matrix Model for Black Hole Thermalization | 23 pages, 5 eps figures. v2: expanded discussion of model, added
references. v3: slightly expanded conclusions | JHEP 0810:028,2008 | 10.1088/1126-6708/2008/10/028 | null | hep-th gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a matrix model which is intended as a toy model of the gauge dual
of an AdS black hole. In particular, it captures the key property that at
infinite $N$ correlators decay to zero on long time scales, while at finite $N$
this cannot happen. The model consists of a harmonic oscillator in the adjoint
which acts as a heat bath for a particle in the fundamental representation. The
Schwinger-Dyson equation reduces to a closed recursion relation, which we study
by various analytical and numerical methods. We discuss some implications for
the information problem.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:59:25 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jul 2008 20:29:57 GMT"
},
{
"version": "v3",
"created": "Mon, 15 Sep 2008 22:06:36 GMT"
}
] | 2009-10-09T00:00:00 | [
[
"Iizuka",
"Norihiro",
""
],
[
"Polchinski",
"Joseph",
""
]
] | [
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] |
801.3658 | Paola Rebusco Dr | Paola Rebusco | Difficulties with the QPOs Resonance Model | To appear in New Astronomy Review, Proceedings of "Jean-Pierre
Lasota, X-ray binaries, accretion disks and compact stars" (October 2007);
Ed. M. Abramowicz | New Astron.Rev.51:855-859,2008 | 10.1016/j.newar.2008.03.015 | null | astro-ph | null | High frequency quasi-periodic oscillations (HFQPOs) have been detected in
microquasars and neutron star systems. The resonance model suggested by
Kluzniak & Abramowicz (2000) explains twin QPOs as two weakly coupled nonlinear
resonant epicyclic modes in the accretion disk. Although this model
successfully explains many features of the observed QPOs, it still faces
difficulties and shortcomings. Here we summarize the aspects of the theory that
remain a puzzle and we briefly discuss likely developments.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:41:05 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Rebusco",
"Paola",
""
]
] | [
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] |
801.3659 | Hu Zhan | Hu Zhan (UC Davis), Lifan Wang (Texas A&M), Philip Pinto (Steward
Observatory), J. Anthony Tyson (UC Davis) | Measuring Baryon Acoustic Oscillations with Millions of Supernovae | 4 pages, 3 figures, ApJL accepted | Astrophys.J., 675, L1-4, 2008 | 10.1086/529546 | null | astro-ph | null | Since type Ia Supernovae (SNe) explode in galaxies, they can, in principle,
be used as the same tracer of the large-scale structure as their hosts to
measure baryon acoustic oscillations (BAOs). To realize this, one must obtain a
dense integrated sampling of SNe over a large fraction of the sky, which may
only be achievable photometrically with future projects such as the Large
Synoptic Survey Telescope. The advantage of SN BAOs is that SNe have more
uniform luminosities and more accurate photometric redshifts than galaxies, but
the disadvantage is that they are transitory and hard to obtain in large number
at high redshift. We find that a half-sky photometric SN survey to redshift z =
0.8 is able to measure the baryon signature in the SN spatial power spectrum.
Although dark energy constraints from SN BAOs are weak, they can significantly
improve the results from SN luminosity distances of the same data, and the
combination of the two is no longer sensitive to cosmic microwave background
priors.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:42:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zhan",
"Hu",
"",
"UC Davis"
],
[
"Wang",
"Lifan",
"",
"Texas A&M"
],
[
"Pinto",
"Philip",
"",
"Steward\n Observatory"
],
[
"Tyson",
"J. Anthony",
"",
"UC Davis"
]
] | [
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] |
801.366 | Ofer Firstenberg | O. Firstenberg, M. Shuker, R. Pugatch, D. R. Fredkin, N. Davidson and
A. Ron | Theory of Thermal Motion in Electromagnetically Induced Transparency:
Diffusion, Doppler, Dicke and Ramsey | Reference added, typos corrected | Phys. Rev. A 77, 043830 (2008) | 10.1103/PhysRevA.77.043830 | null | quant-ph | null | We present a theoretical model for electromagnetically induced transparency
(EIT) in vapor, that incorporates atomic motion and velocity-changing
collisions into the dynamics of the density-matrix distribution. Within a
unified formalism we demonstrate various motional effects, known for EIT in
vapor: Doppler-broadening of the absorption spectrum; Dicke-narrowing and
time-of-flight broadening of the transmission window for a finite-sized probe;
Diffusion of atomic coherence during storage of light and diffusion of the
light-matter excitation during slow-light propagation; and Ramsey-narrowing of
the spectrum for a probe and pump beams of finite-size.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:41:27 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2008 16:33:36 GMT"
}
] | 2008-06-06T00:00:00 | [
[
"Firstenberg",
"O.",
""
],
[
"Shuker",
"M.",
""
],
[
"Pugatch",
"R.",
""
],
[
"Fredkin",
"D. R.",
""
],
[
"Davidson",
"N.",
""
],
[
"Ron",
"A.",
""
]
] | [
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] |
801.3661 | Xiangjun Xing | Xiangjun Xing and Aparna Baskaran (Department of Physics, Syracuse
University) | Isotropic-Cholesteric Transition of a Weakly Chiral Elastomer Cylinder | 7 pages, 2 eps figures | null | 10.1103/PhysRevE.78.021709 | null | cond-mat.soft cond-mat.mtrl-sci | null | When a chiral isotropic elastomer is brought to low temperature cholesteric
phase, the nematic degree of freedom tends to order and form a helix. Due to
the nemato-elastic coupling, this also leads to elastic deformation of the
polymer network that is locally coaxial with the nematic order. However, the
helical structure of nematic order is incompatible with the energetically
preferred elastic deformation. The system is therefore frustrated and
appropriate compromise has to be achieved between the nematic ordering and the
elastic deformation. For a strongly chiral elastomer whose pitch is much
smaller than the system size, this problem has been studied by Pelcotivs and
Meyer, as well as by Warner. In this work, we study the isotropic-cholesteric
transition in the weak chirality limit, where the pitch is comparable or much
larger than system size. We compare two possible solutions: a helical state as
well as a double twist state. We find that the double twist state very
efficiently minimizes both the elastic free energy and the chiral nematic free
energy. On the other hand, the pitch of the helical state is strongly affected
by the nemato-elastic coupling. As a result this state is not efficient in
minimizing the chiral nematic free energy.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:46:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Xing",
"Xiangjun",
"",
"Department of Physics, Syracuse\n University"
],
[
"Baskaran",
"Aparna",
"",
"Department of Physics, Syracuse\n University"
]
] | [
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] |
801.3662 | Sergei Khlebnikov | Z. Gecse and S. Khlebnikov | Classical thermodynamics of gravitational collapse | 11 pages, 5 figures; v3: minor changes; published in Phys. Rev. D | Phys.Rev.D77:104003,2008 | 10.1103/PhysRevD.77.104003 | null | hep-th gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study numerically gravitational collapse of a spherically symmetric
instanton particle in five dimensions. We show that the late stages of the
process are characterized by a nearly constant ``free energy'', the value of
which matches (within numerical uncertainties) the value obtained from standard
black-hole thermodynamics. This suggests a purely classical interpretation of
the free energy of a black hole.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:46:39 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 00:52:08 GMT"
},
{
"version": "v3",
"created": "Tue, 10 Jun 2008 19:52:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gecse",
"Z.",
""
],
[
"Khlebnikov",
"S.",
""
]
] | [
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] |
801.3663 | Gulab C Dewangan | G. C. Dewangan (1), S. Mathur (2), R. E. Griffiths (1), A. R. Rao
(3)((1) Carnegie Mellon Univ., (2) Ohio State Univ., (3) Tata Institute of
Fundamental Research) | X-ray emission from active galactic nuclei with intermediate mass black
holes | 19 pages, ApJ, Submitted | null | 10.1086/591728 | null | astro-ph | null | We present a systematic X-ray study of eight AGNs with intermediate mass
black holes (M_BH 8-95x10^4 Msun) based on 12 XMM-Newton observations. The
sample includes the two prototype AGNs in this class - NGC4395 and POX52 and
six other AGNs discovered with the SDSS. These AGNs show some of the strongest
X-ray variability with the normalized excess variances being the largest and
the power density break time scales being the shortest observed among
radio-quiet AGNs. The excess variance -- luminosity correlation appears to
depend on both the BH mass and the Eddington luminosity ratio. The break time
scale -- black hole mass relations for AGN with IMBHs are consistent with that
observed for massive AGNs. We find that the FWHM of the Hbeta or Halpha line is
uncorrelated with the BH mass, but shows strong anticorrelation with the
Eddington luminosity ratio. Four AGNs show clear evidence for soft X-ray excess
emission (kT_in~150-200eV). X-ray spectra of three other AGNs are consistent
with the presence of the soft excess emission. NGC4395 with lowest L/L_Edd
lacks the soft excess emission. Evidently small black mass is not the primary
driver of strong soft X-ray excess emission from AGNs. The X-ray spectral
properties and optical-to-X-ray spectral energy distributions of these AGNs are
similar to those of Seyfert 1 galaxies. The observed X-ray/UV properties of
AGNs with IMBHs are consistent with these AGNs being low mass extension of more
massive AGNs; those with high Eddington luminosity ratio looking more like
narrow-line Seyfert 1s while those with low $L/L_{Edd}$ looking more like
broad-line Seyfert 1s.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:46:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dewangan",
"G. C.",
""
],
[
"Mathur",
"S.",
""
],
[
"Griffiths",
"R. E.",
""
],
[
"Rao",
"A. R.",
""
]
] | [
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] |
801.3664 | Ferenc Kun | F. Kun, H. A. Carmona, J. S. Andrade Jr., and H. J. Herrmann | Universality behind Basquin's law of fatigue | 4 pages in Revtex, 4 figures, accepted by PRL | Phys. Rev. Lett. 100, 094301 (2008) | 10.1103/PhysRevLett.100.094301 | null | cond-mat.mtrl-sci cond-mat.dis-nn | null | One of the most important scaling laws of time dependent fracture is
Basquin's law of fatigue, namely, that the lifetime of the system increases as
a power law with decreasing external load amplitude, $t_f\sim
\sigma_0^{-\alpha}$, where the exponent $\alpha$ has a strong material
dependence. We show that in spite of the broad scatter of the Basquin exponent
$\alpha$, the fatigue fracture of heterogeneous materials exhibits intriguing
universal features. Based on stochastic fracture models we propose a generic
scaling form for the macroscopic deformation and show that at the fatigue limit
the system undergoes a continuous phase transition when changing the external
load. On the microlevel, the fatigue fracture proceeds in bursts characterized
by universal power law distributions. We demonstrate that in a range of
systems, including deformation of asphalt, a realistic model of deformation,
and a fiber bundle model, the system dependent details are contained in
Basquin's exponent for time to failure, and once this is taken into account,
remaining features of failure are universal.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:49:55 GMT"
}
] | 2011-03-28T00:00:00 | [
[
"Kun",
"F.",
""
],
[
"Carmona",
"H. A.",
""
],
[
"Andrade",
"J. S.",
"Jr."
],
[
"Herrmann",
"H. J.",
""
]
] | [
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] |
801.3665 | James Schombert | K. Rakos (UVienna), J. Schombert (UOregon), A. Odell (NAU) | The Age of Cluster Galaxies from Continuum Colors | 35 pages, 10 figures, accepted by ApJ | null | 10.1086/533513 | null | astro-ph | null | We determine the age of 1,104 early-type galaxies in eight rich clusters ($z
= 0.0046$ to $0.175$) using a new continuum color technique. We find that
galaxies in clusters divide into two populations, an old population with a mean
age similar to the age of the Universe (12 Gyrs) and a younger population with
a mean age of 9 Gyrs. The older population follows the expected relations for
mass and metallicity that imply a classic monolithic collapse origin. Although
total galaxy metallicity is correlated with galaxy mass, it is uncorrelated
with age. It is impossible, with the current data, to distinguish between a
later epoch of star formation, longer duration of star formation or late bursts
of star formation to explain the difference between the old and young
populations. However, the global properties of this younger population are
correlated with cluster environmental factors, which implies secondary
processes, post-formation epoch, operate on the internal stellar population of
a significant fraction of cluster galaxies. In addition, the mean age of the
oldest galaxies in a cluster are correlated with cluster velocity dispersion
implying that galaxy formation in massive clusters begins at earlier epochs
than less massive clusters.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 20:59:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rakos",
"K.",
"",
"UVienna"
],
[
"Schombert",
"J.",
"",
"UOregon"
],
[
"Odell",
"A.",
"",
"NAU"
]
] | [
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] |
801.3666 | Ben Allanach | B.C. Allanach, J.P. Conlon and C.G. Lester | Measuring Smuon-Selectron Mass Splitting at the LHC and Patterns of
Supersymmetry Breaking | 5 pages, 5 figs. v2 has minor changes: to appear in PRD Rapid Comm | Phys.Rev.D77:076006,2008 | 10.1103/PhysRevD.77.076006 | null | hep-ph hep-ex | null | With sufficient data, Large Hadron Collider (LHC) experiments can constrain
the selectron-smuon mass splitting through differences in the di-electron and
di-muon edges from supersymmetry (SUSY) cascade decays. We study the
sensitivity of the LHC to this mass splitting, which within mSUGRA may be
constrained down to O(10^{-4}) for 30 fb^{-1} of integrated luminosity. Over
substantial regions of SUSY breaking parameter space the fractional edge
splitting can be significantly enhanced over the fractional mass splitting.
Within models where the selectron and smuon are constrained to be universal at
a high scale, edge splittings up to a few percent may be induced by
renormalisation group effects and may be significantly discriminated from zero.
The edge splitting provides important information about high-scale SUSY
breaking terms and should be included in any fit of LHC data to high-scale
models.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 21:00:05 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 16:45:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Allanach",
"B. C.",
""
],
[
"Conlon",
"J. P.",
""
],
[
"Lester",
"C. G.",
""
]
] | [
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] |
801.3667 | Gabriele Ghisellini | G. Ghisellini (INAF - Osservatorio Astronomico di Brera) | Emission and power of blazar jets | 6 pages, 5 figures, invited talk at the workshop: High Energy
Phenomena in Relativistic Outflows (HEPRO), Dublin, 24-28 September 2007 | Int.J.Mod.Phys.D17:1491-1501,2008 | 10.1142/S0218271808013078 | null | astro-ph | null | Through the modelling of the Spectral Energy Distribution of blazars we can
infer the physical parameters required to originate the flux we see. Then we
can estimate the power of blazar jets in the form of matter and fields. These
estimates are rather robust for all classes of blazars, although they are in
part dependent of the chosen model (i.e. leptonic rather than adronic). The
indication is that, in almost all cases, the carried Poynting flux is not
dominant, while protons should carry most of the power. In emission line
blazars the jet has a comparable, and often larger, power than the luminosity
of the accretion disk. This is even more true for line-less BL Lacs. If the jet
is structured at the sub-pc scale, with a fast spine surrounded by a slower
layer, then one component sees the radiation of the other boosted, and this
interplay enhances the Inverse Compton flux of both. Since the layer emission
is less beamed, it can be seen also at large viewing angles, making
radio-galaxies very interesting GLAST candidates. Such structures need not be
stable components, and can form and disappear rapidly. Ultrafast TeV
variability is challenging all existing models, suggesting that at least parts
of the jets are moving with large bulk Lorentz factors and at extremely small
viewing angles. However, these fast "bullets" are not necessarily challenging
our main ideas about the energetics and the composition of the bulk of the jet.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 21:00:16 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Ghisellini",
"G.",
"",
"INAF - Osservatorio Astronomico di Brera"
]
] | [
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] |
801.3668 | Akihisa Koga | Akihisa Koga, Norio Kawakami, Robert Peters and Thomas Pruschke | Magnetic properties of the extended periodic Anderson model | 4 pages, 4 figures, accepted for publication in JPSJ | null | 10.1143/JPSJ.77.033704 | null | cond-mat.str-el | null | We study magnetic properties of the extended periodic Anderson model, which
includes electron correlations within and between itinerant and localized
bands. By combining dynamical mean-field theory with the numerical
renormalization group we calculate the sublattice magnetization and the
staggered susceptibility to determine the phase diagram in the particle-hole
symmetric case. We find that two kinds of magnetically ordered states compete
with the Kondo insulating state at zero temperature, which induces
non-monotonic behavior in the temperature-dependent magnetization. It is
furthermore clarified that a novel magnetic metallic state is stabilized at
half filling by the competition between Hund's coupling and the hybridization.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 21:00:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Koga",
"Akihisa",
""
],
[
"Kawakami",
"Norio",
""
],
[
"Peters",
"Robert",
""
],
[
"Pruschke",
"Thomas",
""
]
] | [
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] |
801.3669 | Mohammad Mahmoody | Boaz Barak, Mohammad Mahmoody | Merkle's Key Agreement Protocol is Optimal: An $O(n^2)$ Attack on any
Key Agreement from Random Oracles | This version fixes a bug in the proof of the previous version of this
paper, see "Correction of Error" paragraph and Appendix A | null | null | null | cs.CC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that every key agreement protocol in the random oracle model in
which the honest users make at most $n$ queries to the oracle can be broken by
an adversary who makes $O(n^2)$ queries to the oracle. This improves on the
previous $\widetilde{\Omega}(n^6)$ query attack given by Impagliazzo and Rudich
(STOC '89) and resolves an open question posed by them.
Our bound is optimal up to a constant factor since Merkle proposed a key
agreement protocol in 1974 that can be easily implemented with $n$ queries to a
random oracle and cannot be broken by any adversary who asks $o(n^2)$ queries.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 21:01:37 GMT"
},
{
"version": "v2",
"created": "Fri, 25 Jan 2008 01:41:04 GMT"
},
{
"version": "v3",
"created": "Thu, 10 Jul 2008 14:14:45 GMT"
},
{
"version": "v4",
"created": "Sun, 31 Mar 2019 00:51:20 GMT"
}
] | 2019-04-02T00:00:00 | [
[
"Barak",
"Boaz",
""
],
[
"Mahmoody",
"Mohammad",
""
]
] | [
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] |
801.367 | T. R. Mongan | T. R. Mongan | A holographic charged preon model | 13 pages, two figures, minor corrections to accomodate a scalar boson | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard Model (SM) is a successful approach to particle physics
calculations. However, there are indications that the SM is only a good
approximation to an underlying non-local reality involving fundamental entities
(preons) that are not point particles. Furthermore, our universe seems to be
dominated by a vacuum energy/cosmological constant. The holographic principle
then indicates only a finite number of bits of information will ever be
available to describe the observable universe, and that requires a holographic
preon model linking the (0,1) holographic bits to SM particles. All SM
particles have charges 0, 1/3, 2/3 or 1 in units of the electron charge, so the
bits in a holographic preon model must be identified with fractional electric
charge. Such holographic charged preon models require baryon asymmetry and also
suggest a mechanism for stationary action. This paper outlines a holographic
charged preon model where preons are strands with finite energy density
specified by bits of information identifying the charge on each end. In the
model, SM particles consist of three strands with spin states corresponding to
wrapped states of the strands. SM particles in this wrapped preon model can be
approximated by preon bound states in non-local dynamics based on three-preon
Bethe-Salpeter equations with instantaneous three-preon interactions. The model
can be falsified by data from the Large Hadron Collider because it generates
baryon asymmetry without axions, and does not allow more than three generations
of SM fermions.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 21:02:26 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jun 2010 20:01:21 GMT"
},
{
"version": "v3",
"created": "Sat, 20 Apr 2013 22:23:45 GMT"
}
] | 2013-04-23T00:00:00 | [
[
"Mongan",
"T. R.",
""
]
] | [
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801.3671 | Pedro Vieira G. | Nikolay Gromov, Sakura Schafer-Nameki, Pedro Vieira | Quantum Wrapped Giant Magnon | 17 pages, 2 figures | Phys.Rev.D78:026006,2008 | 10.1103/PhysRevD.78.026006 | CALT-68-2667, LPTENS 08/04, SPhT-t08/017 | hep-th | null | Understanding the finite-size corrections to the fundamental excitations of a
theory is the first step towards completely solving for the spectrum in finite
volume. We compute the leading exponential correction to the quantum energy of
the fundamental excitation of the light-cone gauged string in AdS(5) x S(5),
which is the giant magnon solution. We present two independent ways to obtain
this correction: the first approach makes use of the algebraic curve
description of the giant magnon. The second relies on the purely
field-theoretical Luscher formulas, which depend on the world-sheet S-matrix.
We demonstrate the agreement to all orders in g/Delta of these approaches,
which in particular presents a further test of the S-matrix. We comment on
generalizations of this method of computation to other string configurations.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 19:06:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gromov",
"Nikolay",
""
],
[
"Schafer-Nameki",
"Sakura",
""
],
[
"Vieira",
"Pedro",
""
]
] | [
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] |
801.3672 | Ferenc Kun | Ferenc Kun, Gergely Kocsis, and Janos Farkas | Cellular automata for the spreading of technologies in socio-economic
systems | 11 pages, 7 figures | Physica A 383, 660 (2007) | 10.1016/j.physa.2007.04.063 | null | physics.soc-ph cond-mat.stat-mech | null | We introduce an agent-based model for the spreading of technological
developments in socio-economic systems where the technology is mainly used for
the collaboration/interaction of agents. Agents use products of different
technologies to collaborate with each other which induce costs proportional to
the difference of technological levels. Additional costs arise when
technologies of different providers are used. Agents can adopt technologies and
providers of their interacting partners in order to reduce their costs leading
to microscopic rearrangements of the system. Analytical calculations and
computer simulations revealed that starting from a random configuration of
different technological levels a complex time evolution emerges where the
spreading of advanced technologies and the overall technological progress of
the system are determined by the amount of advantages more advanced
technologies provide, and by the structure of the social environment of agents.
We show that agents tend to form clusters of identical technological level with
a power law size distribution. When technological progress arises, the
spreading of technologies in the system can be described by extreme order
statistics.
| [
{
"version": "v1",
"created": "Wed, 23 Jan 2008 21:05:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kun",
"Ferenc",
""
],
[
"Kocsis",
"Gergely",
""
],
[
"Farkas",
"Janos",
""
]
] | [
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