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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.0798 | Marcin Marciniak | Wladyslaw A. Majewski, Marcin Marciniak | On the structure of positive maps between matrix algebras | 15 pages | null | null | null | math.FA math.OA | null | A partial description of the structure of positive unital maps $\phi:
M_2(\bC) \to M_{n+1}(\bC)$ ($n\geq 2$) is given.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 11:26:06 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Majewski",
"Wladyslaw A.",
""
],
[
"Marciniak",
"Marcin",
""
]
] |
0705.0799 | Franz Michel | Franz Michel, Hans-Gerd Evertz | Lattice dynamics of the Heisenberg chain coupled to finite frequency
bond phonons | 5 pages, 6 figures | null | null | null | cond-mat.str-el | null | The phonon dynamics in a one dimensional Heisenberg spin chain coupled to
finite-frequency bond phonons is studied. We present the first detailed phonon
spectra for these systems using Quantum Monte Carlo. The quantum phase
transition is dominated by a central peak, yet the renormalisation of the main
phonon branch depends strongly on the bare phonon frequency omega_0. The main
branch remains largely unaffected at omega_0 \gsim J, but it softens completely
when omega_0 is low enough. This is an unusual scenario for a structural phase
transition and was observable only on sufficiently large systems. Approaching
the dimerized phase from finite temperature, the lattice dynamics mirrors the
behavior of a three dimensional system. For the efficient measurement of Greens
functions, we introduce a mapping from the stochastic series expansion to
continuous imaginary time.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 08:46:32 GMT"
},
{
"version": "v2",
"created": "Mon, 7 May 2007 23:19:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Michel",
"Franz",
""
],
[
"Evertz",
"Hans-Gerd",
""
]
] |
0705.0800 | Ulrich Jentschura | Ulrich D. Jentschura | Non-uniform convergence of two-photon decay rates for excited atomic
states | 3 pages; LaTeX | J.Phys.A40 (2007) F223-F227 | 10.1088/1751-8113/40/9/F02 | null | physics.atom-ph astro-ph | null | Two-photon decay rates in simple atoms such as hydrogenlike systems represent
rather interesting fundamental problems in atomic physics. The sum of the
energies of the two emitted photons has to fulfill an energy conservation
condition, the decay takes place via intermediate virtual states, and the total
decay rate is obtained after an integration over the energy of one of the
emitted photons. Here, we investigate cases with a virtual state having an
energy intermediate between the initial and the final state of the decay
process, and we show that due to non-uniform convergence, only a careful
treatment of the singularities infinitesimally displaced from the photon
integration contour leads to consistent and convergent results.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 12:52:02 GMT"
}
] | 2013-09-10T00:00:00 | [
[
"Jentschura",
"Ulrich D.",
""
]
] |
0705.0801 | Ulrich Jentschura | Ulrich D. Jentschura and Martin Haas | Two-Loop Effects and Current Status of the 4He+ Lamb Shift | 11 pages, nrc1 style; paper presented at PSAS (2006), Venice | Can.J.Phys. 85 (2007) 531-540 | 10.1139/P07-020 | null | physics.atom-ph | null | We report on recent progress in the treatment of two-loop binding corrections
to the Lamb shift, with a special emphasis on S and P states. We use these and
other results in order to infer an updated theoretical value of the Lamb shift
in 4He+.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 16:15:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jentschura",
"Ulrich D.",
""
],
[
"Haas",
"Martin",
""
]
] |
0705.0802 | Masayasu Harada | Deirdre Black (Cavendish Lab.), Masayasu Harada (Nagoya Univ.) and
Joseph Schechter (Syracuse Univ.) | Two or Four: A Hint from Scalar Mesons in Radiative phi Decays ? | Talk given by M. Harada at Yukawa International Seminar (YKIS) 2006
``New Frontiers in QCD -Exotic Hadrons and Hadronic Matter-'' | Prog.Theor.Phys.Suppl.168:173-177,2007 | 10.1143/PTPS.168.173 | null | hep-ph | null | In this write-up, we summarize our recent analysis of radiative decays
involving light scalar mesons. Our analysis using the vector meson dominance
model at tree level indicates that it may be difficult to distinguish
$qq\bar{q}\bar{q}$ picture and $q\bar{q}$ picture for the light scalar nonet.
Our result on the process of $\phi \to \pi^0 \eta \gamma$ shows that the
derivative-type $f_0 K\bar{K}$ interaction reproduces experimental data below
950 GeV well, but gives a poor fit above 950 GeV, i.e., in the energy region
around the mass of $a_0(980)$, but that the discrepancy can be compensated by
the effect of the $K$ loop.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 12:52:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Black",
"Deirdre",
"",
"Cavendish Lab."
],
[
"Harada",
"Masayasu",
"",
"Nagoya Univ."
],
[
"Schechter",
"Joseph",
"",
"Syracuse Univ."
]
] |
0705.0803 | Wei Qi | K. Hagiwara, W. Qi, C.F. Qiao, J.X. Wang | Re-visiting Direct $J/\psi$ Production at the Fermilab Tevatron | Parallel talk at ICHEP08, Philadelphia, USA, July 2008. 4 pages,
LaTeX, 4 eps figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We re-analyze the direct $\jp$ production processes at the Fermilab Tevatron
in view of the recent observation at the B-factories, where both $\jp$
inclusive and exclusive production rates are found to be about an order of
magnitude larger than the leading order estimates of non-relativistic QCD. The
charm quark fragmentation to $\jp$, which is the dominant color-singlet process
at high $p_T$, is normalized by the B-factory measurements. The process
receives further enhancement due to the charm sea contribution which has so far
been ignored in most analyses. After summing up all sub-process contributions,
we find that the color-singlet mechanism alone can account for 20% to 90% of
the observed direct $\jp$ high $p_T$ production. The polarization rate of the
directly produced $\jp$ is sensitive to the fraction of the color-octet
contribution, which is employed to fill the gap between the color-singlet
prediction and experimental data. With a bigger $K$-factor for the charm quark
fragmentation probability, we envisage a smaller matrix element for the
color-octet $^3S_1^{(8)}$ state, and this can be examined at the LHC in near
future.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 13:35:42 GMT"
},
{
"version": "v2",
"created": "Fri, 9 Nov 2007 00:49:03 GMT"
},
{
"version": "v3",
"created": "Mon, 20 Oct 2008 15:33:49 GMT"
}
] | 2008-10-20T00:00:00 | [
[
"Hagiwara",
"K.",
""
],
[
"Qi",
"W.",
""
],
[
"Qiao",
"C. F.",
""
],
[
"Wang",
"J. X.",
""
]
] |
0705.0804 | Sergej Flach | S. Flach and A. Ponno | The Fermi-Pasta-Ulam problem: periodic orbits, normal forms and
resonance overlap criteria | 14 pages, 4 figures | null | 10.1016/j.physd.2007.11.017 | null | nlin.PS nlin.CD | null | Fermi, Pasta and Ulam observed, that the excitation of a low frequency normal
mode in a nonlinear acoustic chain leads to localization in normal mode space
on large time scales. Fast equipartition (and thus complete delocalization) in
the Fermi-Pasta-Ulam chain is restored if relevant intensive control parameters
exceed certain threshold values. We compare recent results on periodic orbits
(in the localization regime) and resonant normal forms (in a weak
delocalization regime), and relate them to various resonance overlap criteria.
We show that the approaches quantitatively agree in their estimate of the
localization-delocalization threshold. A key ingredient for this transition are
resonances of overtones.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 16:49:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Flach",
"S.",
""
],
[
"Ponno",
"A.",
""
]
] |
0705.0805 | Alexei V. Penskoi | Alexei V. Penskoi | Integrable Systems and Topology of Isospectral Manifolds | 5 pages, LaTeX, Talk given at the Workshop "Classical and Quantum
Integrable Systems-2007" (CQIS-2007), Dubna, Russia. This is an extended
version of the short communication math-ph/0701061. v2: minor changes | Teor. Mat. Fiz. 155 (2008), no 1, 140-146 (Russian). Translation
in Theor. Math. Phys. 155 (2008), no 1, 627-632. | 10.1007/s11232-008-0052-5 | null | math-ph math.MP | null | The well known Liouville-Arnold theorem says that if a level surface of
integrals of an integrable system is compact and connected, then it is a torus.
However, in some important examples of integrable systems the topology of a
level surface of integrals is quite complicated. This is due to the fact that
in these examples the phase space has points where either the Hamiltonian is
singular or the symplectic form is singular or degenerate. In such situations
the Liouville-Arnold theorem does not apply. However, sometimes it is possible
to define the corresponding flow on the whole level surface of integrals and
use this flow to investigate the topology. Tomei (1982) and Fried (1986) used
the Toda lattice to study the topology of the isospectral variety of Jacobi
matrices. We recall these results and we also expose new results concerning the
topology of the isospectral variety of zero-diagonal Jacobi matrices. This
topology is studied using the Volterra system.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 13:39:00 GMT"
},
{
"version": "v2",
"created": "Sun, 24 Jun 2007 05:15:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Penskoi",
"Alexei V.",
""
]
] |
0705.0806 | Fabrizio Zanello | Fabrizio Zanello | Interval Conjectures for level Hilbert functions | Several changes. In particular, the conjecture has been extended (and
the title of the article has been modified). To appear in the J. of Algebra | J. Algebra 321 (2009), No. 10, 2705-2715 | null | null | math.AC | null | We conjecture that the set of all Hilbert functions of (artinian) level
algebras enjoys a very natural form of regularity, which we call the {\em
Interval Conjecture} (IC): If, for some positive integer $\alpha $,
$(1,h_1,...,h_i,...,h_e)$ and $(1,h_1,...,h_i+\alpha ,...,h_e)$ are both level
$h$-vectors, then $(1,h_1,...,h_i+\beta ,...,h_e)$ is also level for each
integer $\beta =0,1,..., \alpha .$ In the Gorenstein case, i.e. when $h_e=1$,
we also supply the {\em Gorenstein Interval Conjecture} (GIC), which naturally
generalizes the IC, and basically states that the same property simultaneously
holds for any two symmetric entries, say $h_i$ and $h_{e-i}$, of a Gorenstein
$h$-vector.
These conjectures are inspired by the research performed in this area over
the last few years. A series of recent results seems to indicate that it will
be nearly impossible to characterize explicitly the sets of all Gorenstein or
of all level Hilbert functions. Therefore, our conjectures would at least
provide the existence of a very strong - and natural - form of order in the
structure of such important and complicated sets.
We are still far from proving the conjectures at this point. However, we will
already solve a few interesting cases, especially when it comes to the IC, in
this paper. Among them, that of Gorenstein $h$-vectors of socle degree 4, that
of level $h$-vectors of socle degree 2, and that of non-unimodal level
$h$-vectors of socle degree 3 and any given codimension.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 14:07:08 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Sep 2007 21:08:45 GMT"
}
] | 2009-03-28T00:00:00 | [
[
"Zanello",
"Fabrizio",
""
]
] |
0705.0807 | Fardin Kheirandish | M. Amooshahi and F. Kheirandish | Electromagnetic field quantization in a magnetodielectric medium with
external charges | 21 pages | Phys. Rev. A, 76, 062103 (2007) | 10.1103/PhysRevA.76.062103 | null | quant-ph | null | The electromagnetic field inside a cubic cavity filled up with a linear
magnetodielectric medium and in the presence of external charges is quantized
by modelling the magnetodielectric medium with two independent quantum fields.
Electric and magnetic polarization densities of the medium are defined in terms
of the ladder operators of the medium and eigenmodes of the cavity. Maxwell and
constitutive equations of the medium together with the equation of motion of
the charged particles have been obtained from the Heisenberg equations using a
minimal coupling scheme. Spontaneous emission of a two level atom embedded in a
magnetodielectric medium is calculated in terms of electric and magnetic
susceptibilities of the medium and the Green function of the cubic cavity as an
application of the model.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 14:39:27 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Dec 2007 14:18:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Amooshahi",
"M.",
""
],
[
"Kheirandish",
"F.",
""
]
] |
0705.0808 | Maillard Gregory | R. Fernandez, G. Maillard | Uniqueness and non-uniqueness of chains on half lines | 14 pages | null | null | null | math.PR | null | We establish a one-to-one correspondence between one-sided and two-sided
regular systems of conditional probabilities on the half-line that preserves
the associated chains and Gibbs measures. As an application, we determine
uniqueness and non-uniqueness regimes in one-sided versions of ferromagnetic
Ising models with long range interactions. Our study shows that the interplay
between chain and Gibbsian theories yields more information than that contained
within the known theory of each separate framework. In particular: (i) A
Gibbsian construction due to Dyson yields a new family of chains with phase
transitions; (ii) these transitions show that a square summability uniqueness
condition of chains is false in the general non-shift-invariant setting, and
(iii) an uniqueness criterion for chains shows that a Gibbsian conjecture due
to Kac and Thompson is false in this half-line setting.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 15:46:58 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Fernandez",
"R.",
""
],
[
"Maillard",
"G.",
""
]
] |
0705.0809 | Eric Josef Ribeiro Parteli | Eric J. R. Parteli and Hans J. Herrmann | Dune formation on the present Mars | 16 pages, 12 figures | null | 10.1103/PhysRevE.76.041307 | null | cond-mat.other | null | We apply a model for sand dunes to calculate formation of dunes on Mars under
the present Martian atmospheric conditions. We find that different dune shapes
as those imaged by Mars Global Surveyor could have been formed by the action of
sand-moving winds occuring on today's Mars. Our calculations show, however,
that Martian dunes could be only formed due to the higher efficiency of Martian
winds in carrying grains into saltation. The model equations are solved to
study saltation transport under different atmospheric conditions valid for
Mars. We obtain an estimate for the wind speed and migration velocity of
barchan dunes at different places on Mars. From comparison with the shape of
bimodal sand dunes, we find an estimate for the timescale of the changes in
Martian wind regimes.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 16:26:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Parteli",
"Eric J. R.",
""
],
[
"Herrmann",
"Hans J.",
""
]
] |
0705.0810 | Paolo Natoli | Paolo Cabella, Paolo Natoli, Joseph Silk | Constraints on CPT violation from WMAP three year polarization data: a
wavelet analysis | 7 pages, 4 figures, some modifications to match accepted (PRD)
version, results unchanged | Phys.Rev.D76:123014,2007 | 10.1103/PhysRevD.76.123014 | null | astro-ph | null | We perform a wavelet analysis of the temperature and polarization maps of the
Cosmic Microwave Background (CMB) delivered by the WMAP experiment in search
for a parity violating signal. Such a signal could be seeded by new physics
beyond the standard model, for which the Lorentz and CPT symmetries may not
hold. Under these circumstances, the linear polarization direction of a CMB
photon may get rotated during its cosmological journey, a phenomenon also
called cosmological birefringence. Recently, Feng et al. have analyzed a subset
the WMAP and BOOMERanG 2003 angular power spectra of the CMB, deriving a
constraint that mildly favors a non zero rotation. By using wavelet transforms
we set a tighter limit on the CMB photon rotation angle \Delta\alpha= -2.5 \pm
3.0 (\Delta\alpha= -2.5 \pm 6.0) at the one (two) \sigma level, consistent with
a null detection.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 16:33:43 GMT"
},
{
"version": "v2",
"created": "Mon, 12 Nov 2007 14:54:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cabella",
"Paolo",
""
],
[
"Natoli",
"Paolo",
""
],
[
"Silk",
"Joseph",
""
]
] |
0705.0811 | Oleg Velichko | O. I. Velichko, Yu. P. Shaman, A. K. Fedotov, A. V. Masanik | Set of equations for transient enhanced diffusion in shallow
ion-implanted layers | 11 pages, 1 figure, 17 references | null | null | null | cond-mat.mtrl-sci | null | To simulate the transient enhanced diffusion near the surface or interface, a
set of equations describing the impurity diffusion and quasichemical reactions
of dopant atoms and point defects in ion-implanted layers is proposed and
analyzed. The diffusion equations obtained take into account different charge
states of mobile or immobile species and drift the mobile species in the
built-in electric field and field of elastic stresses. The absorption of
self-interstitials on the surface and drift of the defects due to elastic
stresses result in the nonuniform distributions of point defects. It was shown
analytically and by means of numerical calculations that consideration of the
nonuniform defect distributions enables one to explain the phenomenon of
"uphill" impurity diffusion near the surface during annealing of ion-implanted
layers. The performed calculations of the boron concentration profile after
annealing of a shallow implanted layer agree well with the experimental data
confirming the efficiency of the proposed equations.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 17:13:02 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 21:02:43 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Velichko",
"O. I.",
""
],
[
"Shaman",
"Yu. P.",
""
],
[
"Fedotov",
"A. K.",
""
],
[
"Masanik",
"A. V.",
""
]
] |
0705.0812 | Sergey Uzunyan | D0 Collaboration, V. Abazov, et al | Search for third-generation leptoquarks in ppbar collisions at
sqrt(s)=1.96 TeV | Submitted to PRL, LaTeX, 7 pages, 5 figures | Phys.Rev.Lett.99:061801,2007 | 10.1103/PhysRevLett.99.061801 | FERMILAB-PUB-07-113-E | hep-ex | null | We report on a search for charge-1/3 third-generation leptoquarks (LQ)
produced in ppbar collisions at sqrt(s)=1.96 TeV using the D0 detector at
Fermilab. Third generation leptoquarks are assumed to be produced in pairs and
to decay to a tau neutrino and a b quark with branching fraction B. We place
upper limits on sigma(ppbar->LQLQbar)*B^2 as a function of the leptoquark mass
M_{LQ}. Assuming B=1, we exclude at the 95% confidence level third-generation
scalar leptoquarks with M_{LQ} < 229 GeV.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 19:29:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"D0 Collaboration",
"",
""
],
[
"Abazov",
"V.",
""
]
] |
0705.0813 | Yakov V. Fominov | Ya. V. Fominov | Conductance of a junction between a normal metal and a Berezinskii
superconductor | 5 pages (including 3 EPS figures) | JETP Letters 86, 732 (2007) [Pis'ma v ZhETF 86, 842 (2007)] | 10.1134/S0021364007230117 | null | cond-mat.supr-con cond-mat.mes-hall | null | The conductance of a junction between a normal metal and a superconductor
having the symmetry proposed by Berezinskii is studied theoretically. The main
feature of this symmetry is the odd frequency dependence of the anomalous Green
function, which makes possible the s-wave triplet superconducting state (the
Berezinskii superconductor). The Andreev reflection (which links positive and
negative energies) is sensitive to the energetic symmetry; as a result, the
conductance of the junction involving the Berezinskii superconductor is
qualitatively different from the case of a conventional superconductor.
Experimentally, the obtained results can be employed to test the possibility of
the Berezinskii superconductivity proposed for Na$_x$CoO$_2$ and to identify
the odd-omega component predicted for superconductor-ferromagnet junctions.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 18:26:47 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Dec 2007 20:16:32 GMT"
},
{
"version": "v3",
"created": "Sat, 15 Mar 2008 18:24:16 GMT"
}
] | 2008-03-15T00:00:00 | [
[
"Fominov",
"Ya. V.",
""
]
] |
0705.0814 | Frederic Mangolte | Fabrizio Catanese, Fr\'ed\'eric Mangolte | Real singular Del Pezzo surfaces and threefolds fibred by rational
curves, I | 18 pages, 8 figures, final version to appear in Michigan Mathematical
Journal | null | null | null | math.AG | null | Let W -> X be a real smooth projective threefold fibred by rational curves.
Koll\'ar proved that if W(R) is orientable a connected component N of W(R) is
essentially either a Seifert fibred manifold or a connected sum of lens spaces.
Let k : = k(N) be the integer defined as follows: If g : N -> F is a Seifert
fibration, one defines k : = k(N) as the number of multiple fibres of g, while,
if N is a connected sum of lens spaces, k is defined as the number of lens
spaces different from P^3(R). Our Main Theorem says: If X is a geometrically
rational surface, then k <= 4. Moreover we show that if F is diffeomorphic to
S^1xS^1, then W(R) is connected and k = 0. These results answer in the
affirmative two questions of Koll\'ar who proved in 1999 that k <= 6 and
suggested that 4 would be the sharp bound. We derive the Theorem from a careful
study of real singular Del Pezzo surfaces with only Du Val singularities.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 19:14:02 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Jul 2007 15:24:41 GMT"
}
] | 2007-07-25T00:00:00 | [
[
"Catanese",
"Fabrizio",
""
],
[
"Mangolte",
"Frédéric",
""
]
] |
0705.0815 | Andrea Lo Pumo | Andrea Lo Pumo | Overview of the Netsukuku network | null | null | null | null | cs.NI | null | Netsukuku is a P2P network system designed to handle a large number of nodes
with minimal CPU and memory resources. It can be easily used to build a
worldwide distributed, anonymous and not controlled network, separated from the
Internet, without the support of any servers, ISPs or authority controls. In
this document, we give a generic and non technical description of the Netsukuku
network, emphasizing its main ideas and features.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 19:36:47 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Pumo",
"Andrea Lo",
""
]
] |
0705.0816 | Michael Dugger | M. Dugger, B.G. Ritchie, J.P. Ball, P. Collins, E. Pasyuk, R.A. Arndt,
W.J. Briscoe, I.I. Strakovsky, R.L. Workman, CLAS Collaboration | $\pi^0$ photoproduction on the proton for photon energies from 0.675 to
2.875 GeV | 18 pages, 48 figures | Phys.Rev.C76:025211,2007 | 10.1103/PhysRevC.76.025211 | null | hep-ex | null | Differential cross sections for the reaction $\gamma p \to p \pi^0$ have been
measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged
photon beam with energies from 0.675 to 2.875 GeV. The results reported here
possess greater accuracy in the absolute normalization than previous
measurements. They disagree with recent CB-ELSA measurements for the process at
forward scattering angles. Agreement with the SAID and MAID fits is found below
1 GeV. The present set of cross sections has been incorporated into the SAID
database, and exploratory fits have been extended to 3 GeV. Resonance couplings
have been extracted and compared to previous determinations.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 19:37:36 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 00:14:06 GMT"
}
] | 2010-04-06T00:00:00 | [
[
"Dugger",
"M.",
""
],
[
"Ritchie",
"B. G.",
""
],
[
"Ball",
"J. P.",
""
],
[
"Collins",
"P.",
""
],
[
"Pasyuk",
"E.",
""
],
[
"Arndt",
"R. A.",
""
],
[
"Briscoe",
"W. J.",
""
],
[
"Strakovsky",
"I. I.",
""
],
[
"Workman",
"R. L.",
""
],
[
"Collaboration",
"CLAS",
""
]
] |
0705.0817 | Andrea Lo Pumo | Andrea Lo Pumo | Quantum Shortest Path Netsukuku | null | null | null | null | cs.NI | null | This document describes the QSPN, the routing discovery algorithm used by
Netsukuku. Through a deductive analysis the main proprieties of the QSPN are
shown. Moreover, a second version of the algorithm, is presented.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 20:05:44 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Pumo",
"Andrea Lo",
""
]
] |
0705.0818 | Yang Sun | Yang Sun, Mike Guidry, Cheng-Li Wu | k-dependent SU(4) model of high-temperature superconductivity and its
coherent-state solutions | 10 pages, 7 figures | null | 10.1103/PhysRevB.78.174524 | null | cond-mat.supr-con cond-mat.str-el nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the SU(4) model [1-5] for high-Tc superconductivity to an SU(4)k
model that permits explicit momentum (k) dependence in predicted observables.
We derive and solve gap equations that depend on k, temperature, and doping
from the SU(4)k coherent states, and show that the new SU(4)k model reduces to
the original SU(4) model for observables that do not depend explicitly on
momentum. The results of the SU(4)k model are relevant for experiments such as
ARPES that detect explicitly k-dependent properties. The present SU(4)k model
describes quantitatively the pseudogap temperature scale and may explain why
the ARPES-measured T* along the anti-nodal direction is larger than other
measurements that do not resolve momentum. It also provides an immediate
microscopic explanation for Fermi arcs observed in the pseudogap region. In
addition, the model leads to a prediction that even in the underdoped regime,
there exist doping-dependent windows around nodal points in the k-space, where
antiferromagnetism may be completely suppressed for all doping fractions,
permitting pure superconducting states to exist.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 20:06:59 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Oct 2008 15:13:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sun",
"Yang",
""
],
[
"Guidry",
"Mike",
""
],
[
"Wu",
"Cheng-Li",
""
]
] |
0705.0819 | Andrea Lo Pumo | Andrea Lo Pumo | The Netsukuku network topology | null | null | null | null | cs.NI | null | In this document, we describe the fractal structure of the Netsukuku
topology. Moreover, we show how it is possible to use the QSPN v2 on the high
levels of the fractal.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 20:12:16 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Pumo",
"Andrea Lo",
""
]
] |
0705.0820 | Andrea Lo Pumo | Andrea Lo Pumo | ANDNA: the distributed hostname management system of Netsukuku | null | null | null | null | cs.NI | null | We present the Abnormal Netsukuku Domain Name Anarchy system. ANDNA is the
distributed, non hierarchical and decentralised system of hostname management
used in the Netsukuku network.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 20:19:51 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Pumo",
"Andrea Lo",
""
]
] |
0705.0821 | Filippo Viviani | Filippo Viviani | Restricted infinitesimal deformations of restricted simple Lie algebras | 15 pages; final version, to appear in Journal of Algebra and Its
Applications | J. Algebra Appl. 11 (2012) 1250091 | 10.1142/S0219498812500910 | null | math.AG math.NT math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the restricted infinitesimal deformations of the restricted simple
Lie algebras over an algebraically closed field of characteristic different
from 2 and 3.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 20:29:18 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Feb 2009 00:06:54 GMT"
},
{
"version": "v3",
"created": "Wed, 16 Nov 2011 19:56:03 GMT"
}
] | 2012-10-01T00:00:00 | [
[
"Viviani",
"Filippo",
""
]
] |
0705.0822 | Yang Sun | Mike Guidry, Yang Sun, Cheng-Li Wu | The Origin of Fermi Arcs in Cuprate Pseudogap States and Strong
Constraints on Viable Theories of High-Temperature Superconductivity | 4 pages, 3 figures | null | null | null | cond-mat.supr-con cond-mat.str-el nucl-th | null | A full Fermi surface exists in underdoped high-temperature superconductors if
the temperature T lies above the pseudogap temperature T*. Below T* only arcs
of Fermi surface survive, scaling with T/T* as T -> 0, with T* displaying
strong doping dependence. There is no accepted explanation for this behavior.
We show that generalizing the BCS theory of normal superconductivity to include
d-wave pairs and antiferromagnetism leads to the origin and doping dependence
of the T* scale, and a quantitative description of Fermi arcs. These results
place strong constraints on viable theories of high-temperature
superconductivity.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 20:38:46 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Oct 2007 15:08:33 GMT"
}
] | 2007-10-01T00:00:00 | [
[
"Guidry",
"Mike",
""
],
[
"Sun",
"Yang",
""
],
[
"Wu",
"Cheng-Li",
""
]
] |
0705.0823 | Anael Lemaitre | Ana\"el Lema\^itre and Christiane Caroli | Plastic response of a 2D amorphous solid to quasi-static shear : I -
Transverse particle diffusion and phenomenology of dissipative events | null | null | 10.1103/PhysRevE.76.036104 | null | cond-mat.stat-mech cond-mat.dis-nn | null | We perform extensive simulations of a 2D LJ glass subjected to quasi-static
shear deformation at T=0. We analyze the distribution of non-affine
displacements in terms of contributions of plastic, irreversible events, and
elastic, reversible motions. From this, we extract information about
correlations between plastic events and about the elastic non-affine noise.
Moreover, we find that non-affine motion is essentially diffusive, with a
clearly size-dependent diffusion constant. These results, supplemented by close
inspection of the evolving patterns of the non-affine tangent displacement
field, lead us to propose a phenomenology of plasticity in such amorphous
media. It can be schematized in terms of elastic loading and irreversible flips
of small, randomly located shear transformation zones, elastically coupled via
their quadrupolar fields.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 20:43:55 GMT"
},
{
"version": "v2",
"created": "Mon, 7 May 2007 22:28:31 GMT"
}
] | 2016-03-28T00:00:00 | [
[
"Lemaître",
"Anaël",
""
],
[
"Caroli",
"Christiane",
""
]
] |
0705.0824 | Yunchang Shin | Yunchang Shin, W. Mike Snow, Chen-yu Liu, Christopher M. Lavelle,
David V. Baxter | A Microscpoic Model for the Neutron Dynamic Structure Factor of Solid
Methane in phase II | 26 pages, 11 figures | null | null | null | physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have constructed an approximate microscopic model for the neutron dynamic
structure factor of solid methane in phase II. We expect our model to apply for
neutron energies below 1\textit{eV} at pressures near 1 bar and temperatures
below 20K, where solid methane exists in a phase, called phase II, in which the
tetrahedral hydrogens exist in a mixed phase of free rotors and hindered
rotors. Certain matrix elements needed for the dynamic structure factor $S(Q,
\omega)$ are adapted from a calculation by Ozaki \textit{et
al.}\cite{ozaki:3442}\cite{ozaki2}. The model treats the effects of molecular
translations, intramolecular vibrations and the free and hindered rotational
degrees of freedom as uncoupled ones. Total scattering cross sections
calculated from the model agree with the cross section measurements of
Grieger\cite{grieger:3161} and Whittemore\cite{Wittemore} for the incident
neutron energies of 0.5 \textit{meV} $\sim$ 1\textit{eV}. The effective density
of states extracted from the model was compared with the Harker $&$ Brugger
frequency spectrum extracted from neutron scattering measurements conducted at
22K\cite{HARKER1967}.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 21:26:26 GMT"
},
{
"version": "v2",
"created": "Fri, 9 Nov 2007 19:37:10 GMT"
},
{
"version": "v3",
"created": "Thu, 15 Nov 2007 22:06:27 GMT"
},
{
"version": "v4",
"created": "Thu, 21 Aug 2008 00:40:58 GMT"
}
] | 2008-08-21T00:00:00 | [
[
"Shin",
"Yunchang",
""
],
[
"Snow",
"W. Mike",
""
],
[
"Liu",
"Chen-yu",
""
],
[
"Lavelle",
"Christopher M.",
""
],
[
"Baxter",
"David V.",
""
]
] |
0705.0825 | Ram Gopal Vishwakarma | Ram Gopal Vishwakarma (Zacatecas University) | Einstein's Theory of Gravity in the Presence of Pressure: A Review | Title corrected | null | 10.1007/s10509-009-0016-8 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mysterious `dark energy' needed to explain the current observations,
poses a serious confrontation between fundamental physics and cosmology. The
present crisis may be an outcome of the (so far untested) prediction of the
general theory of relativity that the pressure of the matter source also
gravitates. In this view, a theoretical analysis reveals some surprising
inconsistencies and paradoxes faced by the energy-stress tensor (in the
presence of pressure) which is used to model the matter content of the
universe, including dark energy.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 18:25:27 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Jul 2007 21:10:46 GMT"
},
{
"version": "v3",
"created": "Thu, 26 Jul 2007 23:11:28 GMT"
},
{
"version": "v4",
"created": "Tue, 5 May 2009 19:59:37 GMT"
},
{
"version": "v5",
"created": "Sat, 16 May 2020 02:11:14 GMT"
}
] | 2020-05-19T00:00:00 | [
[
"Vishwakarma",
"Ram Gopal",
"",
"Zacatecas University"
]
] |
0705.0826 | Eugeniusz Chimczak | Eugeniusz Chimczak | Integrated light in direct excitation and energy transfer luminescence | 5 pages, 8 figures | null | null | null | physics.optics | null | Integrated light in direct excitation and energy transfer luminescence has
been investigated. In the investigations reported here, monomolecular centers
were taken into account. It was found that the integrated light is equal to the
product of generation rate and time of duration of excitation pulse for both
direct excitation and energy transfer luminescence.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 21:52:35 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chimczak",
"Eugeniusz",
""
]
] |
0705.0827 | Eric Woolgar | T. Oliynyk, V. Suneeta, E. Woolgar | A Metric for Gradient RG Flow of the Worldsheet Sigma Model Beyond First
Order | 15 pages; Erroneous sentence in footnote 14 removed; this version
therefore supersedes the published version (our thanks to Dezhong Chen for
the correction) | Phys.Rev.D76:045001,2007 | 10.1103/PhysRevD.76.045001 | null | hep-th gr-qc math.DG | null | Tseytlin has recently proposed that an action functional exists whose
gradient generates to all orders in perturbation theory the Renormalization
Group (RG) flow of the target space metric in the worldsheet sigma model. The
gradient is defined with respect to a metric on the space of coupling constants
which is explicitly known only to leading order in perturbation theory, but at
that order is positive semi-definite, as follows from Perelman's work on the
Ricci flow. This gives rise to a monotonicity formula for the flow which is
expected to fail only if the beta function perturbation series fails to
converge, which can happen if curvatures or their derivatives grow large. We
test the validity of the monotonicity formula at next-to-leading order in
perturbation theory by explicitly computing the second-order terms in the
metric on the space of coupling constants. At this order, this metric is found
not to be positive semi-definite. In situations where this might spoil
monotonicity, derivatives of curvature become large enough for higher order
perturbative corrections to be significant.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 21:56:15 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Jun 2007 18:40:37 GMT"
},
{
"version": "v3",
"created": "Tue, 2 Oct 2007 05:05:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Oliynyk",
"T.",
""
],
[
"Suneeta",
"V.",
""
],
[
"Woolgar",
"E.",
""
]
] |
0705.0828 | Tshilidzi Marwala | D.L. Falk, D. M. Rubin and T. Marwala | Enhancement of Noisy Planar Nuclear Medicine Images using Mean Field
Annealing | 4 pages | null | null | null | cs.CV | null | Nuclear medicine (NM) images inherently suffer from large amounts of noise
and blur. The purpose of this research is to reduce the noise and blur while
maintaining image integrity for improved diagnosis. The proposed solution is to
increase image quality after the standard pre- and post-processing undertaken
by a gamma camera system. Mean Field Annealing (MFA) is the image processing
technique used in this research. It is a computational iterative technique that
makes use of the Point Spread Function (PSF) and the noise associated with the
NM image. MFA is applied to NM images with the objective of reducing noise
while not compromising edge integrity. Using a sharpening filter as a
post-processing technique (after MFA) yields image enhancement of planar NM
images.
| [
{
"version": "v1",
"created": "Sun, 6 May 2007 23:08:04 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Falk",
"D. L.",
""
],
[
"Rubin",
"D. M.",
""
],
[
"Marwala",
"T.",
""
]
] |
0705.0829 | Yasuhiro Asano | Yasuhiro Asano, Yukio Tanaka, Alexander A. Golubov, and Satoshi
Kashiwaya | Conductance Spectroscopy of Spin-triplet Superconductors | 4pages, 3 figures embedded | Phys. Rev. Lett. 99, 067005 (2007) | 10.1103/PhysRevLett.99.067005 | null | cond-mat.supr-con cond-mat.mes-hall | null | We propose a novel experiment to identify the symmetry of superconductivity
on the basis of theoretical results for differential conductance of a normal
metal connected to a superconductor. The proximity effect from the
superconductor modifies the conductance of the remote current depending
remarkably on the pairing symmetry: spin-singlet or spin-triplet. The clear-cut
difference in the conductance is explained by symmetry of Cooper pairs in a
normal metal with respect to frequency. In the spin-triplet case, the anomalous
transport is realized due to an odd-frequency symmetry of Cooper pairs.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 00:03:16 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Asano",
"Yasuhiro",
""
],
[
"Tanaka",
"Yukio",
""
],
[
"Golubov",
"Alexander A.",
""
],
[
"Kashiwaya",
"Satoshi",
""
]
] |
0705.0830 | Joseph Geddes III | Joseph B. Geddes III, Tom G. Mackay, and Akhlesh Lakhtakia | On the refractive index for a nonmagnetic two-component medium:
resolution of a controversy | manuscript submitted to Optics Communications | Opt. Commun., Vol. 280, pp. 120-125 (2007) | 10.1016/j.optcom.2007.08.025 | null | physics.optics physics.class-ph | null | The refractive index of a dielectric medium comprising both passive and
inverted components in its permittivity was determined using two methods: (i)
in the time domain, a finite-difference algorithm to compute the
frequency-domain reflectance from reflection data for a pulsed plane wave that
is normally incident on a dielectric half-space, and (ii) in the frequency
domain, the deflection of an obliquely incident Gaussian beam on transmission
through a dielectric slab. The dielectric medium was found to be an active
medium with a negative real part for its refractive index. Thereby, a recent
controversy in the scientific literature was resolved.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 00:20:34 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Geddes",
"Joseph B.",
"III"
],
[
"Mackay",
"Tom G.",
""
],
[
"Lakhtakia",
"Akhlesh",
""
]
] |
0705.0831 | F. J. Sanchez-Salcedo | A. Santillan, F.J. Sanchez-Salcedo, J. Franco | Exploring cloudy gas accretion as a source of interstellar turbulence in
the outskirts of disks | 13 pages, 3 figures, accepted for publication in ApJ Letters | null | 10.1086/519247 | null | astro-ph | null | High--resolution 2D--MHD numerical simulations have been carried out to
investigate the effects of continuing infall of clumpy gas in extended HI
galactic disks. Given a certain accretion rate, the response of the disk
depends on its surface gas density and temperature. For Galactic conditions at
a galactocentric distance of ~20 kpc, and for mass accretion rates consistent
with current empirical and theoretical determinations in the Milky Way, the
rain of compact high velocity clouds onto the disk can maintain transonic
turbulent motions in the warm phase (~2500 K) of HI. Hence, the HI line width
is expected to be ~6.5 km/s for a gas layer at 2500 K, if infall were the only
mechanism of driving turbulence. Some statistical properties of the resulting
forcing flow are shown in this Letter. The radial dependence of the gas
velocity dispersion is also discussed.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 01:08:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Santillan",
"A.",
""
],
[
"Sanchez-Salcedo",
"F. J.",
""
],
[
"Franco",
"J.",
""
]
] |
0705.0832 | Bo'az Klartag | Bo'az Klartag | A Berry-Esseen type inequality for convex bodies with an unconditional
basis | 34 pages, minor revision: Some remarks and explanations were added.
To appear in Probab. Theory Related Fields | null | null | null | math.PR math.MG | null | We provide a sharp rate of convergence in the central limit theorem for
random vectors with an unconditional, log-concave density. The argument relies
on analysis of the Neumann laplacian on convex domains and on the theory of
optimal transportation of measures.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 00:37:21 GMT"
},
{
"version": "v2",
"created": "Sun, 30 Dec 2007 21:30:22 GMT"
},
{
"version": "v3",
"created": "Thu, 1 May 2008 03:09:07 GMT"
}
] | 2008-05-01T00:00:00 | [
[
"Klartag",
"Bo'az",
""
]
] |
0705.0833 | Elena Stolyarova Y | Elena Stolyarova, Kwang Taeg Rim, Sunmin Ryu, Janina Maultzsch, Philip
Kim, Louis E. Brus, Tony F. Heinz, Mark S. Hybertsen, and George W. Flynn | High-Resolution Scanning Tunneling Microscopy Imaging of Mesoscopic
Graphene Sheets on an Insulating Surface | Accepted to PNAS | Proc Natl Acad Sci U S A. 2007 May 29;104(22):9209-12 | 10.1073/pnas.0703337104 | null | cond-mat.mes-hall | null | We present scanning tunneling microscopy (STM) images of single-layer
graphene crystals examined under ultrahigh vacuum conditions. The samples, with
lateral dimensions on the micron scale, were prepared on a silicon dioxide
surface by direct exfoliation of single crystal graphite. The single-layer
films were identified using Raman spectroscopy. Topographic images of
single-layer samples display the honeycomb structure expected for the full
hexagonal symmetry of an isolated graphene monolayer. The absence of observable
defects in the STM images is indicative of the high quality of these films.
Crystals comprised of a few layers of graphene were also examined. They
exhibited dramatically different STM topography, displaying the reduced
three-fold symmetry characteristic of the surface of bulk graphite.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 00:51:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stolyarova",
"Elena",
""
],
[
"Rim",
"Kwang Taeg",
""
],
[
"Ryu",
"Sunmin",
""
],
[
"Maultzsch",
"Janina",
""
],
[
"Kim",
"Philip",
""
],
[
"Brus",
"Louis E.",
""
],
[
"Heinz",
"Tony F.",
""
],
[
"Hybertsen",
"Mark S.",
""
],
[
"Flynn",
"George W.",
""
]
] |
0705.0834 | Frauke Bleher | Frauke Bleher | Universal deformation rings and dihedral 2-groups | 16 pages, 1 table | J. London Math. Soc. 79 (2009), 225-237 | 10.1112/jlms/jdn071 | null | math.RT math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $k$ be an algebraically closed field of characteristic 2, and let $W$ be
the ring of infinite Witt vectors over $k$. Suppose $D$ is a dihedral 2-group.
We prove that the universal deformation ring $R(D,V)$ of an endo-trivial
$kD$-module $V$ is always isomorphic to $W[\mathbb{Z}/2\times\mathbb{Z}/2]$. As
a consequence we obtain a similar result for modules $V$ with stable
endomorphism ring $k$ belonging to an arbitrary nilpotent block with defect
group $D$. This confirms for such $V$ conjectures on the ring structure of the
universal deformation ring of $V$ which had previously been shown for $V$
belonging to cyclic blocks or to blocks with Klein four defect groups.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 15:10:37 GMT"
},
{
"version": "v2",
"created": "Sat, 8 Nov 2008 01:19:56 GMT"
}
] | 2009-01-24T00:00:00 | [
[
"Bleher",
"Frauke",
""
]
] |
0705.0835 | Shyamsunder Erramilli | Logan Chieffo, Jason J. Amsden, Jeffrey Shattuck, Mi K. Hong, Lawrence
Ziegler, Shyamsunder Erramilli | Vibrational Infrared Lifetime of the Anesthetic nitrous oxide gas in
solution | 7 pages, 3 Figures, Presented at Biophysics conference in Singapore
2005 | Biophysical Review Letters, 1:309-316 (2006) | null | null | physics.bio-ph physics.chem-ph | null | The lifetime of the asymmetric fundamental stretching 2218 cm$^{-1}$
vibration of the anesthetic gas nitrous oxide (N$_2$O) dissolved in octanol and
olive oil is reported. These solvents are model systems commonly used to assess
anesthetic potency. Picosecond time-scale molecular dynamics simulations have
suggested that protein dynamics or membrane dynamics play a role in the
molecular mechanism of anesthetic action. Ultrafast infrared spectroscopy with
100 fs time resolution is an ideal tool to probe dynamics of anesthetic
molecules on such timescales. Pump-probe studies at the peak of the vibrational
band yield a lifetime of $55 \pm 1$ ps in olive oil and $52 \pm 1 ps$ in
octanol. The similarity of lifetimes suggests that energy relaxation of the
anesthetic is determined primarily by the hydrophobic nature of the
environment, consistent with models of anesthetic action. The results show that
nitrous oxide is a good model system for probing anesthetic-solvent
interactions using nonlinear infrared spectroscopy.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 01:27:46 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chieffo",
"Logan",
""
],
[
"Amsden",
"Jason J.",
""
],
[
"Shattuck",
"Jeffrey",
""
],
[
"Hong",
"Mi K.",
""
],
[
"Ziegler",
"Lawrence",
""
],
[
"Erramilli",
"Shyamsunder",
""
]
] |
0705.0836 | Steve Hofmann | M. Alfonseca, P. Auscher, A. Axelsson, S. Hofmann and S. Kim | Analyticity of layer potentials and $L^{2}$ solvability of boundary
value problems for divergence form elliptic equations with complex
$L^{\infty}$ coefficients | null | Adv. Math. 226 (2011), no. 5, 4533--4606 | 10.1016/j.aim.2010.12.014 | null | math.AP math.CA | null | We consider divergence form elliptic operators of the form $L=-\dv
A(x)\nabla$, defined in $R^{n+1} = \{(x,t)\in R^n \times R \}$, $n \geq 2$,
where the $L^{\infty}$ coefficient matrix $A$ is $(n+1)\times(n+1)$, uniformly
elliptic, complex and $t$-independent. We show that for such operators,
boundedness and invertibility of the corresponding layer potential operators on
$L^2(\mathbb{R}^{n})=L^2(\partial\mathbb{R}_{+}^{n+1})$, is stable under
complex, $L^{\infty}$ perturbations of the coefficient matrix. Using a variant
of the $Tb$ Theorem, we also prove that the layer potentials are bounded and
invertible on $L^2(\mathbb{R}^n)$ whenever $A(x)$ is real and symmetric (and
thus, by our stability result, also when $A$ is complex, $\Vert
A-A^0\Vert_{\infty}$ is small enough and $A^0$ is real, symmetric, $L^{\infty}$
and elliptic). In particular, we establish solvability of the Dirichlet and
Neumann (and Regularity) problems, with $L^2$ (resp. $\dot{L}^2_1)$ data, for
small complex perturbations of a real symmetric matrix. Previously, $L^2$
solvability results for complex (or even real but non-symmetric) coefficients
were known to hold only for perturbations of constant matrices (and then only
for the Dirichlet problem), or in the special case that the coefficients
$A_{j,n+1}=0=A_{n+1,j}$, $1\leq j\leq n$, which corresponds to the Kato square
root problem.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 01:39:44 GMT"
}
] | 2011-07-05T00:00:00 | [
[
"Alfonseca",
"M.",
""
],
[
"Auscher",
"P.",
""
],
[
"Axelsson",
"A.",
""
],
[
"Hofmann",
"S.",
""
],
[
"Kim",
"S.",
""
]
] |
0705.0837 | Yi Liao | Yi Liao (Nankai U.) | Bounds on Unparticles Couplings to Electrons: from Electron g-2 to
Positronium Decays | v1: 8 pages, 1 figure; v2: proofread version for PRD. (1) Added '(see
also [4])' just before eq. (5). (2) Update ref list and change its format,
change one PACS number. (3) Minor changes during the course of copyediting,
like adding punctuation to eqs, changing hyphenation, etc | Phys.Rev.D76:056006,2007 | 10.1103/PhysRevD.76.056006 | null | hep-ph hep-ex | null | Unparticles as suggested recently by Georgi have surprising phenomenological
implications, distinctive from any other new physics that we know of. But they
must interact very feebly with ordinary matter to have avoided detection thus
far. We determine how feebly they can interact with the electron, using the
precisely measured quantities in QED: the electron g-2 and the bounds on
invisible and exotic positronium decays. The most stringent bound comes from
invisible ortho-positronium decays: the effective energy scale entering the
vector unparticle-electron interaction must exceed 4 x 10^5 TeV for a scaling
dimension 3/2 of the vector unparticle. The lower bounds on scales for other
unparticles range from a few tens to a few hundreds TeV. This makes the
detection of unparticles challenging in low energy electron systems.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 01:48:31 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Sep 2007 06:08:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Liao",
"Yi",
"",
"Nankai U."
]
] |
0705.0838 | Shantanu Roy | Shantanu Roy, Waldemar Hellmann, Stefan Goedecker | A Bell-Evans-Polanyi principle for molecular dynamics trajectories and
its implications for global optimization | null | null | 10.1103/PhysRevE.77.056707 | null | physics.comp-ph physics.chem-ph | null | The Bell-Evans-Polanyi principle that is valid for a chemical reaction that
proceeds along the reaction coordinate over the transition state is extended to
molecular dynamics trajectories that in general do not cross the dividing
surface between the initial and the final local minima at the exact transition
state. Our molecular dynamics Bell-Evans-Polanyi principle states that low
energy molecular dynamics trajectories are more likely to lead into the basin
of attraction of a low energy local minimum than high energy trajectories. In
the context of global optimization schemes based on molecular dynamics our
molecular dynamics Bell-Evans-Polanyi principle implies that using low energy
trajectories one needs to visit a smaller number of distinguishable local
minima before finding the global minimum than when using high energy
trajectories.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 02:56:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Roy",
"Shantanu",
""
],
[
"Hellmann",
"Waldemar",
""
],
[
"Goedecker",
"Stefan",
""
]
] |
0705.0839 | Steve Hofmann | S. Hofmann | Dahlberg's bilinear estimate for solutions of divergence form complex
elliptic equations | null | null | null | null | math.CA | null | We consider divergence form elliptic operators $L=-\dv A(x)\nabla$, defined
in $\mathbb{R}^{n+1}=\{(x,t)\in\mathbb{R}^{n}\times\mathbb{R}\}, n \geq 2$,
where the $L^{\infty}$ coefficient matrix $A$ is $(n+1)\times(n+1)$, uniformly
elliptic, complex and $t$-independent. Using recently obtained results
concerning the boundedness and invertibility of layer potentials associated to
such operators, we show that if $Lu=0$ in $\mathbb{R}^{n+1}_+$, then for any
vector-valued ${\bf v} \in W^{1,2}_{loc},$ we have the bilinear estimate
$$|\iint_{\mathbb{R}^{n+1}_+} \nabla u \cdot \bar{{\bf v}} dx dt |\leq
C\sup_{t>0} \|u(\cdot,t)\|_{L^2(\mathbb{R}^n)}(\||t \nabla {\bf v}\|| +
\|N_*{\bf v}\|_{L^2(\mathbb{R}^n)}),$$ where $\||F\|| \equiv
(\iint_{\mathbb{R}^{n+1}_+} |F(x,t)|^2 t^{-1} dx dt)^{1/2},$ and where $N_*$ is
the usual non-tangential maximal operator. The result is new even in the case
of real symmetric coefficients, and generalizes the analogous result of
Dahlberg for harmonic functions on Lipschitz graph domains.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 02:16:19 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hofmann",
"S.",
""
]
] |
0705.0840 | Steve Hofmann | S. Hofmann | A proof of the local $Tb$ Theorem for standard Calder\'{o}n-Zygmund
operators | Unpublished manuscript, based on the cited paper [AHMTT] | null | null | null | math.CA math.AP | null | We give a proof of a so-called "local $Tb$" Theorem for singular integrals
whose kernels satisfy the standard Calder\'on-Zygmund conditions. The present
theorem, which extends an earlier result of M. Christ \cite{Ch}, was proved in
\cite{AHMTT} for "perfect dyadic" Calder\'on-Zygmund operators. The proof in
\cite{AHMTT} essentially carries over to the case considered here, with some
technical adjustments.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 02:29:50 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hofmann",
"S.",
""
]
] |
0705.0841 | Yoshihiro Shimazu | Y. Shimazu, T. Niizeki | Characteristics of Switchable Superconducting Flux Transformer with DC
Superconducting Quantum Interference Device | 5 pages, 8 figures | Jpn. J. Appl. Phys. 46 (2007) 1478 | 10.1143/JJAP.46.1478 | null | cond-mat.supr-con | null | We have investigated the flux transfer characteristics of a switchable flux
transformer comprising a superconducting loop and a DC superconducting quantum
interference device (DC-SQUID). This system can be used to couple multiple flux
qubits with a controllable coupling strength. Its characteristics were measured
using a flux input coil and a DC-SQUID for readout coupled to the transformer
loop in a dilution refrigerator. The observed characteristics are consistent
with the calculation results. We have demonstrated the reversal of the slope of
the characteristics and the complete switching off of the transformer, which
are useful features for its application as a controllable coupler for flux
qubits.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 02:34:56 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Shimazu",
"Y.",
""
],
[
"Niizeki",
"T.",
""
]
] |
0705.0842 | Jiamin Jin | J Jin (for the Phenix) | PHENIX Measurement of High-$p_T$ Hadron-hadron and Photon-hadron
Azimuthal Correlations | 5 pages, proceeding for parallel talk on Quark Matter 2006 | J.Phys.G34:S813-816,2007 | 10.1088/0954-3899/34/8/S102 | null | nucl-ex | null | High-$p_T$ hadron-hadron correlations have been measured with the PHENIX
experiment in $\Cu$ and $\pp$ collisions at $\sqrt{s_{NN}}=200$ GeV. A
comparison of the jet widths and yields between the two colliding systems
allows us to study the medium effect on jets. We also present a first
measurement of direct photon-hadron correlations in $\Au$ and $\pp$ collisions.
We find that the near-side yields are consistent with zero in both systems. By
comparing the jet yields on the away side, we observe a suggestion of the
expected suppression of hadrons associated with photons in $\Au$ collisions.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 02:37:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Jin",
"J",
"",
"for the Phenix"
]
] |
0705.0843 | Jianpeng Ma | Cheng Zhang, Jianpeng Ma | Simulation via Direct Computation of Partition Functions | 10 pages, 3 figures, 2 tables; reference added, minor clarifications; | Physics Review E 76, 036708 (2007) | 10.1103/PhysRevE.76.036708 | null | cond-mat.stat-mech | null | In this paper, we demonstrate the efficiency of simulations via direct
computation of the partition function under various macroscopic conditions,
such as different temperatures or volumes. The method can compute partition
functions by flattening histograms, through the Wang-Landau recursive scheme,
outside the energy space. This method offers a more general and flexible
framework for handling various types of ensembles, especially the ones in which
computation of the density of states is not convenient. It can be easily scaled
to large systems, and it is flexible in incorporating Monte Carlo cluster
algorithms or molecular dynamics. High efficiency is shown in simulating large
Ising models, in finding ground states of simple protein models, and in
studying the liquid-vapor phase transition of a simple fluid. The method is
very simple to implement and we expect it to be efficient in studying complex
systems with rugged energy landscapes, e.g., biological macromolecules.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 03:05:51 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 17:42:06 GMT"
},
{
"version": "v3",
"created": "Sat, 22 Sep 2007 03:17:50 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Zhang",
"Cheng",
""
],
[
"Ma",
"Jianpeng",
""
]
] |
0705.0844 | Jean-Francois Lafont | J.-F. Lafont, I. J. Ortiz | Algebraic K-theory of hyperbolic 3-simplex reflection groups | 33 pages, 2 figures, 7 tables | Comment. Math. Helv. 84 (2009), pgs. 297-337 | null | null | math.KT math.GT | null | A hyperbolic 3-simplex reflection group is a Coxeter group arising as a
lattice in the isometry group of hyperbolic 3-space, with fundamental domain a
geodesic simplex (possibly with some ideal vertices). The classification of
these groups is known, and there are exactly 9 cocompact examples, and 23
non-cocompact examples. We provide a complete computation of the lower
algebraic K-theory of the integral group ring of all the hyperbolic 3-simplex
reflection groups.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 03:31:37 GMT"
}
] | 2009-04-13T00:00:00 | [
[
"Lafont",
"J. -F.",
""
],
[
"Ortiz",
"I. J.",
""
]
] |
0705.0845 | Otto Kong | Otto C. W. Kong (Nat'l Central U, Taiwan) | The Quantum World is an AdS_5 with the Quantum Relativity Symmetry
SO(2,4) | 10 pages of revtex, no figure;a largely rewritten presentation of the
same results | null | null | NCU-HEP-k028 | gr-qc hep-th | null | Quantum relativity as a generalized, or rather deformed, version of Einstein
relativity with a linear realization on a classical six-geometry beyond the
familiar setting of space-time offer a new framework to think about the quantum
space-time structure. The formulation requires two deformations to be
implemented through imposing two fundamental invariants. We take them to be the
independent Planck mass and Planck length. Together, they gives the quantum
$\hbar$. The scheme leads to {\small \boldmath\protect SO(2,4)} as the
relativity symmetry. The quantum world has an AdS$_5$ `classical' geometry,
which is parallel to the "conformal universe", but not scale invariant.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 03:34:32 GMT"
},
{
"version": "v2",
"created": "Fri, 25 Jan 2008 06:09:11 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Kong",
"Otto C. W.",
"",
"Nat'l Central U, Taiwan"
]
] |
0705.0846 | Sergey Pankov | S. Pankov, R. Moessner, S. L. Sondhi | Resonating singlet valence plaquettes | 12 pages, 15 figures, minor changes, references added, Phys Rev B
version | Phys. Rev. B 76, 104436 (2007) | 10.1103/PhysRevB.76.104436 | null | cond-mat.str-el cond-mat.stat-mech | null | We consider the simplest generalizations of the valence bond physics of SU(2)
singlets to SU(N) singlets that comprise objects with N sites -- these are
SU(N) singlet plaquettes with N=3 and N=4 in three spatial dimensions.
Specifically, we search for a quantum mechanical liquid of such objects -- a
resonating singlet valence plaquette phase that generalizes the celebrated
resonating valence bond phase for SU(2) spins. We extend the Rokhsar-Kivelson
construction of the quantum dimer model to the simplest SU(4) model for valence
plaquette dynamics on a cubic lattice. The phase diagram of the resulting
quantum plaquette model is analyzed both analytically and numerically. We find
that the ground state is solid everywhere, including at the Rokhsar-Kivelson
point where the ground state is an equal amplitude sum. By contrast, the equal
amplitude sum of SU(3) singlet triangular plaquettes on the face centered cubic
lattice is liquid and thus a candidate for describing a resonating single
valence plaquette phase, given a suitably defined local Hamiltonian.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 03:49:59 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Feb 2008 18:59:20 GMT"
}
] | 2008-02-15T00:00:00 | [
[
"Pankov",
"S.",
""
],
[
"Moessner",
"R.",
""
],
[
"Sondhi",
"S. L.",
""
]
] |
0705.0847 | Vijaya Gaddam prakash | K. Pradeesh, C.J. Oton, V. K. Agotiya, M. Raghavendra and G. Vijaya
Prakash | Optical properties of Er3+ doped alkali-chloro phosphate glasses for
optical amplifiers | submitted to Optical materials | null | 10.1016/j.optmat.2008.02.007 | null | cond-mat.mtrl-sci cond-mat.dis-nn | null | A new class of Erbium doped glasses with compositions xNa2O - (60-x)PbCl2 -
40P2O5 (x=0, 10, 20 and 30) were fabricated and characterized for optical
properties. Absorption spectra were analyzed for important Judd-Ofelt
parameters from the integrated intensities of various Er3+ glass absorption
bands. Photoluminescence (PL) and its decay behavior studies were carried out
for the transition 4I13/2 -> 4I15/2. A systematic correlation between the
Judd-Ofelt parameter {omega}2 and the covalent nature of the glass matrix was
observed, due to increased role of bridging oxygens in the glass network. The
PL broadness and life times of 4I13/2_> 4I15/2 transition were typically in the
range of 40-60nm and 2.13-2.5ms respectively. These glasses broadly showed high
transparency, high refractive index, shorter life times and, most importantly,
these glasses were found to be capable of being doped with larger
concentrations of Er3+ (up to 4 wt%). Increase of Er3+ concentration resulted
in the increase in PL line-widths with no significant effect of concentration
quenching, indicating that these glasses are suitable for optical
fibre/waveguide amplifiers.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 04:14:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pradeesh",
"K.",
""
],
[
"Oton",
"C. J.",
""
],
[
"Agotiya",
"V. K.",
""
],
[
"Raghavendra",
"M.",
""
],
[
"Prakash",
"G. Vijaya",
""
]
] |
0705.0848 | May Lim | May Lim, Dan Braha, Sanith Wijesinghe, Stephenson Tucker, and Yaneer
Bar-Yam | Preferential Detachment in Broadcast Signaling Networks: Connectivity
and Cost Trade-off | null | null | 10.1209/0295-5075/79/58005 | null | nlin.AO | null | We consider a network of nodes distributed in physical space without physical
links communicating through message broadcasting over specified distances.
Typically, communication using smaller distances is desirable due to savings in
energy or other resources. We introduce a network formation mechanism to enable
reducing the distances while retaining connectivity. Nodes, which initially
transmit signals at a prespecified maximum distance, subject links to
preferential detachment by autonomously decreasing their transmission radii
while satisfying conditions of zero communication loss and fixed maximum
node-hopping distance for signaling. Applied to networks with various spatial
topologies, we find cost reductions as high as 90% over networks that are
restricted to have all nodes with equal transmission distance.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 05:05:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lim",
"May",
""
],
[
"Braha",
"Dan",
""
],
[
"Wijesinghe",
"Sanith",
""
],
[
"Tucker",
"Stephenson",
""
],
[
"Bar-Yam",
"Yaneer",
""
]
] |
0705.0849 | Victor Flambaum | V. V. Flambaum, M. G. Kozlov | Enhanced sensitivity to variation of the fine structure constant and
m_p/m_e in diatomic molecules | v.3: references added + few other minor changes | Phys.Rev.Lett.99:150801,2007 | 10.1103/PhysRevLett.99.150801 | null | physics.atom-ph | null | Sensitivity to temporal variation of the fundamental constants may be
strongly enhanced in transitions between narrow close levels of different
nature. This enhancement may be realized in a large number of molecules due to
cancelation between the ground state fine structure omega_f and vibrational
interval omega_v (omega=omega_f - n omega_v is close to zero, delta
omega/omega= K (2 delta alpha/alpha +0.5 delta mu/mu), K >>1, mu=m_p/m_e).
The intervals between the levels are conveniently located in microwave
frequency range and the level widths are very small. Required accuracy of the
shift measurements is about 0.01-1 Hz. As examples, we consider molecules
Cl_2+, CuS, IrC, SiBr and HfF+.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 05:26:36 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 03:43:36 GMT"
},
{
"version": "v3",
"created": "Thu, 30 Aug 2007 10:19:38 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Flambaum",
"V. V.",
""
],
[
"Kozlov",
"M. G.",
""
]
] |
0705.0850 | Eric Vazquez | E. Vazquez (for the PHENIX Collaboration) | Jet modification and a comparative study of hadron v2 measurements in
sqrt(s_NN) = 200 GeV Au+Au collisions at RHIC-PHENIX | 5 pages, 4 figures, Proceedings of Poster Session, 19th International
Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (Quark Matter
2006), November 14-20, 2006, Shanghai, P.R.China | Int.J.Mod.Phys.E16:1901-1905,2007 | 10.1142/S0218301307007209 | null | nucl-ex | null | In this analysis we measure the azimuthal angle($\phi$) dependence of hadrons
with respect to the reaction plane ($\Psi_{RP}$) in events that were triggered
by a high-$p_T$ $\pi^0$ of 5-10 GeV. Fitting the distribution of hadrons with a
function of the type $\xi(1+2v_2\cos{(2(\phi-\Psi_{RP})}))$, we observe that
there is no significant statistical difference between $v_2$ inclusive hadrons
and those hadrons from hard scattering events. We also compare the near-side
jet widths using PYTHIA simulations with $h^{\pm}$-$h^{\pm}$ correlations in
Au+Au at $\sqrt{s_{NN}}=200$ GeV.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 05:35:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Vazquez",
"E.",
"",
"for the PHENIX Collaboration"
]
] |
0705.0851 | Frank Grundahl | F. Grundahl, H. Kjeldsen, J. Christensen-Dalsgaard, T. Arentoft, S.
Frandsen | Stellar Oscillations Network Group | Proc. Vienna Workshop on the Future of Asteroseismology, 20 - 22
September 2006. Comm. in Asteroseismology, Vol. 150, in the press | J.Phys.Conf.Ser.118:012041,2008 | 10.1088/1742-6596/118/1/012041 | null | astro-ph | null | Stellar Oscillations Network Group (SONG) is an initiative aimed at designing
and building a network of 1m-class telescopes dedicated to asteroseismology and
planet hunting. SONG will have 8 identical telescope nodes each equipped with a
high-resolution spectrograph and an iodine cell for obtaining precision radial
velocities and a CCD camera for guiding and imaging purposes. The main
asteroseismology targets for the network are the brightest (V<6) stars. In
order to improve performance and reduce maintenance costs the instrumentation
will only have very few modes of operation. In this contribution we describe
the motivations for establishing a network, the basic outline of SONG and the
expected performance.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 05:56:31 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Grundahl",
"F.",
""
],
[
"Kjeldsen",
"H.",
""
],
[
"Christensen-Dalsgaard",
"J.",
""
],
[
"Arentoft",
"T.",
""
],
[
"Frandsen",
"S.",
""
]
] |
0705.0852 | Aiichi Iwazaki | Aiichi Iwazaki | Two Dimensional Quantum Well of Gluons in Color Ferromagnetic Quark
Matter | 11 pages | null | null | Nisho-07/02 | hep-ph | null | We have recently pointed out that color magnetic field is generated in dense
quark matter, i.e. color ferromagnetic phase of quark matter. Using light cone
quantization, we show that gluons occupying the lowest Landau level under the
color magnetic field effectively form a two dimensional quantum well (layer),
in which infinitely many zero modes of the gluons are present. We discuss that
the zero modes of the gluons form a quantum Hall state by interacting
repulsively with each other, just as electrons do in semiconductors. Such a
ferromagnetic quark matter with the layer structure of the gluons is a possible
origin of extremely strong magnetic field observed in magnetars.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 05:58:23 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Iwazaki",
"Aiichi",
""
]
] |
0705.0853 | Rene Blacher | Ren\'e Blacher (LJK) | Une nouvelle condition d'independance pour le theoreme de la limite
centrale | null | null | null | null | math.PR | null | We prove a central limit theorem with aassumptions which are many weak than
classical conditions
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 06:09:33 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Blacher",
"René",
"",
"LJK"
]
] |
0705.0854 | Maria Chekhova Dr | I.N.Agafonov, M.V.Chekhova, T.Sh.Iskhakov, A.N.Penin | High-Visibility Multi-Photon Interference of Classical Light | 4 pages, 5 figures | null | null | null | quant-ph | null | It is shown that the visibility of multi-photon interference for classical
sources grows rapidly with the order of interference. For three-photon and
four-photon interference of two coherent sources, the visibility can be as high
as 81.9% and 94.4%, respectively, - much higher than the 'classical limit' of
two-photon interference (50%). High-visibility three-photon and four-photon
interference has been observed in experiment, for both coherent and
pseudo-thermal light.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 06:21:34 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Agafonov",
"I. N.",
""
],
[
"Chekhova",
"M. V.",
""
],
[
"Iskhakov",
"T. Sh.",
""
],
[
"Penin",
"A. N.",
""
]
] |
0705.0855 | Guanrong Chen | Yuming Shi and Guanrong Chen | A discrete computer network model with expanding dimensions | 14 pages, 0 figures, 6 referecnes | null | null | null | nlin.CD | null | Complex networks with expanding dimensions are studied, where the networks
may be directed and weighted, and network nodes are varying in discrete time in
the sense that some new nodes may be added and some old nodes may be removed
from time to time. A model of such networks in computer data transmission is
discussed. Each node on the network has fixed dimensionality, while the
dimension of the whole network is defined by the total number of nodes. Based
on the spectacular properties of data transmission on computer networks, some
new concepts of stable and unstable networks differing from the classical
Lyapunov stability are defined. In particular, a special unstable network
model, called devil network, is introduced and discussed. It is further found
that a variety of structures and connection weights affects the network
stability substantially. Several criteria on stability, instability, and devil
network are established for a rather general class of networks, where some
conditions are actually necessary and sufficient. Mathematically, this paper
makes a first attempt to rigorously formulate a fundamental issue of modeling
discrete linear time-varying systems with expanding dimensions and study their
basic stability property.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 06:21:51 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Shi",
"Yuming",
""
],
[
"Chen",
"Guanrong",
""
]
] |
0705.0856 | Damien Chablat | Emilie Bouyer (IRCCyN), St\'ephane Caro (IRCCyN), Damien Chablat
(IRCCyN), Jorge Angeles (CIM) | The Multiobjective Optimization of a Prismatic Drive | null | ASME Design Engineering Technical Conference (04/09/2007) 1-9 | null | null | cs.RO | null | The multiobjective optimization of Slide-o-Cam is reported in this paper.
Slide-o-Cam is a cam mechanism with multiple rollers mounted on a common
translating follower. This transmission provides pure-rolling motion, thereby
reducing the friction of rack-and-pinions and linear drives. A Pareto frontier
is obtained by means of multiobjective optimization. This optimization is based
on three objective functions: (i) the pressure angle, which is a suitable
performance index for the transmission because it determines the amount of
force transmitted to the load vs. that transmitted to the machine frame; (ii)
the Hertz pressure used to evaluate the stresses produced on the contact
surface between cam and roller; and (iii) the size of the mechanism,
characterized by the number of cams and their width.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 06:39:17 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bouyer",
"Emilie",
"",
"IRCCyN"
],
[
"Caro",
"Stéphane",
"",
"IRCCyN"
],
[
"Chablat",
"Damien",
"",
"IRCCyN"
],
[
"Angeles",
"Jorge",
"",
"CIM"
]
] |
0705.0857 | Susan Atlas | Krishna Muralidharan, Steven M. Valone, Susan R. Atlas | Environment Dependent Charge Potential for Water | 19 pages, 10 figs.; submitted to J. Chem. Phys | null | null | LANL Report No. LA-UR-07-0685 | cond-mat.mtrl-sci | null | We present a new interatomic potential for water captured in a
charge-transfer embedded atom method (EAM) framework. The potential accounts
for explicit, dynamical charge transfer in atoms as a function of the local
chemical environment. As an initial test of the charge-transfer EAM approach
for a molecular system, we have constructed a relatively simple version of the
potential and examined its ability to model the energetics of small water
clusters. The excellent agreement between our results and current experimental
and higher-level quantum computational data signifies a successful first step
towards developing a unified charge-transfer potential capable of accurately
describing the polymorphs, dynamics, and complex thermodynamic behavior of
water.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 06:45:06 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Muralidharan",
"Krishna",
""
],
[
"Valone",
"Steven M.",
""
],
[
"Atlas",
"Susan R.",
""
]
] |
0705.0858 | Florent Schaffhauser | Florent Schaffhauser | A real convexity theorem for quasi-hamiltonian actions | 25 pages | null | null | null | math.SG | null | The main result of this paper is a quasi-hamiltonian analogue of a special
case of the O'Shea-Sjamaar convexity theorem for usual momentum maps. We denote
by U a simply connected compact connected Lie group and we fix an involutive
automorphism of maximal rank on this Lie group (such an automorphism always
exists). We then denote by M a quasi-hamiltonian U-space and we prove that the
image under the momentum map of the fixed-point set of a form-reversing
compatible involution of M is a convex polytope, which is in fact equal to the
full momentum polytope. This theorem was announced in arXiv:math/0609517v1. As
an application, we obtain an example of lagrangian subspace in representation
spaces of surface groups.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 06:51:17 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Schaffhauser",
"Florent",
""
]
] |
0705.0859 | Kunio Ishida | Kunio Ishida and Keiichiro Nasu | Coherent dynamics of photoinduced nucleation processes | 14 pages, 5 figures | Phys. Rev. B76, 014302 (2007) | 10.1103/PhysRevB.76.014302 | null | cond-mat.mtrl-sci cond-mat.other | null | We study the dynamics of initial nucleation processes of photoinduced
structural change of molecular crystals. In order to describe the nonadiabatic
transition in each molecule, we employ a model of localized electrons coupled
with a fully quantized phonon mode, and the time-dependent Schr\"odinger
equation for the model is numerically solved. We found a minimal model to
describe the nucleation induced by injection of an excited state of a single
molecule in which multiple types of intermolecular interactions are required.
In this model coherently driven molecular distortion plays an important role in
the successive conversion of electronic states which leads to photoinduced
cooperative phenomena.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 06:54:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ishida",
"Kunio",
""
],
[
"Nasu",
"Keiichiro",
""
]
] |
0705.0860 | Guido Altarelli | Guido Altarelli | Models of Neutrino Masses and Mixings: a Progress Report | Talk presented at the XII International Workshop on Neutrino
Telescopes, March 6-9, 2007, Venice, Italy. 23 pages, 2 figures | null | null | RM3-TH/07-9 | hep-ph | null | We present some recent developments on model building for neutrino masses and
mixings. In particular, we review tri-bimaximal neutrino mixing derived from
discrete groups, notably A4. We discuss the problems encountered with extending
the symmetry to the quark sector and with Grand Unification.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 16:25:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Altarelli",
"Guido",
""
]
] |
0705.0861 | Ben Lasscock | B. G. Lasscock, J. N. Hedditch, W. Kamleh, D. B. Leinweber, W.
Melnitchouk, A. G. Williams, J. M. Zanotti | Even parity excitations of the nucleon in lattice QCD | 10 pages, 4 figures, 1 table | Phys.Rev.D76:054510,2007 | 10.1103/PhysRevD.76.054510 | ADP-07-05/T645, JLAB-THY-07-642, Edinburgh 2007/9 | hep-lat | null | We study the spectrum of the even parity excitations of the nucleon in
quenched lattice QCD. We extend our earlier analysis by including an expanded
basis of nucleon interpolating fields, increasing the physical size of the
lattice, including more configurations to enhance statistics and probing closer
to the chiral limit. With a review of world lattice data, we conclude that
there is little evidence of the Roper resonance in quenched lattice QCD.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 10:26:36 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 01:46:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lasscock",
"B. G.",
""
],
[
"Hedditch",
"J. N.",
""
],
[
"Kamleh",
"W.",
""
],
[
"Leinweber",
"D. B.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Williams",
"A. G.",
""
],
[
"Zanotti",
"J. M.",
""
]
] |
0705.0862 | Quesne Christiane | C. Quesne | Spectrum generating algebras for position-dependent mass oscillator
Schrodinger equations | 21 pages, no figure, 2 misprints corrected; published version | J. Phys. A: Math. Theor. 40 (2007) 13107-13119 | 10.1088/1751-8113/40/43/018 | ULB/229/CQ/07/3 | math-ph math.MP math.QA quant-ph | null | The interest of quadratic algebras for position-dependent mass Schr\"odinger
equations is highlighted by constructing spectrum generating algebras for a
class of d-dimensional radial harmonic oscillators with $d \ge 2$ and a
specific mass choice depending on some positive parameter $\alpha$. Via some
minor changes, the one-dimensional oscillator on the line with the same kind of
mass is included in this class. The existence of a single unitary irreducible
representation belonging to the positive-discrete series type for $d \ge 2$ and
of two of them for d=1 is proved. The transition to the constant-mass limit
$\alpha \to 0$ is studied and deformed su(1,1) generators are constructed.
These operators are finally used to generate all the bound-state wavefunctions
by an algebraic procedure.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 07:48:08 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 14:34:29 GMT"
},
{
"version": "v3",
"created": "Tue, 9 Oct 2007 14:45:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Quesne",
"C.",
""
]
] |
0705.0863 | Choon-Lin Ho | Choon-Lin Ho, Ryu Sasaki | Quasi-exactly solvable Fokker-Planck equations | 8 pages, no figures. Sect. IV.C rewritten, and other places slightly
modified accordingly. New references added | null | 10.1016/j.aop.2007.12.001 | Yukawa Institute for Theoretical Physics, Kyoto Univ. report
YITP-07-21 | cond-mat.stat-mech cond-mat.other hep-th math-ph math.MP nlin.SI quant-ph | null | We consider exact and quasi-exact solvability of the one-dimensional
Fokker-Planck equation based on the connection between the Fokker-Planck
equation and the Schr\"odinger equation. A unified consideration of these two
types of solvability is given from the viewpoint of prepotential together with
Bethe ansatz equations. Quasi-exactly solvable Fokker-Planck equations related
to the $sl(2)$-based systems in Turbiner's classification are listed. We also
present one $sl(2)$-based example which is not listed in Turbiner's scheme.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 07:54:13 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Oct 2007 11:02:02 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Ho",
"Choon-Lin",
""
],
[
"Sasaki",
"Ryu",
""
]
] |
0705.0864 | Wei Fang | W. Fang, G. S. Solomon, and H. Cao | Tuning the shape of semiconductor microstadium laser | null | null | null | null | physics.optics | null | We presented a detailed experimental study on lasing in GaAs microstadium
with various shapes. Unlike most deformed microcavities, the lasing threshold
varies non-monotonically with the major-to-minor-axis ratio of the stadium.
Under spatially uniform optical pumping, the first lasing mode corresponds to a
high-quality scar mode consisting of several unstable periodic orbits. By
tuning the shape of GaAs stadium, we are able to minimize the lasing threshold.
This work demonstrates the possibility of controlling chaotic microcavity
laser.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 08:11:08 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Fang",
"W.",
""
],
[
"Solomon",
"G. S.",
""
],
[
"Cao",
"H.",
""
]
] |
0705.0865 | Taizan Watari | Y. Nakayama, Masato Taki, Taizan Watari and T.T. Yanagida | Gauge Mediation with D-term SUSY Breaking | 15 pages; v2: comments and references added | Phys.Lett.B655:58-66,2007 | 10.1016/j.physletb.2007.08.064 | UT-KOMABA/07-5, UT-07-13 | hep-ph hep-th | null | We construct a gauge-mediation model with a D-term supersymmetry (SUSY)
breaking. R-symmetry breaking necessary for generating the SUSY standard-model
gaugino masses is given by gaugino condensation of a strongly coupled gauge
theory in the hidden sector. The energy scale of the strong dynamics of the
hidden sector gauge theory should be around the messenger mass scale M, or
otherwise perturbative calculations would be reliable and would lead to
negative soft mass squared for squarks and sleptons. Thus, all the mass scales
are controlled by a virtually single parameter, \sqrt{D}/M. This model covers a
very wide range of gravitino mass, m_{3/2} \simeq 1 eV--100 TeV. Possible
embeddings of the model in string theory are also discussed.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 08:22:11 GMT"
},
{
"version": "v2",
"created": "Wed, 29 Aug 2007 11:45:52 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nakayama",
"Y.",
""
],
[
"Taki",
"Masato",
""
],
[
"Watari",
"Taizan",
""
],
[
"Yanagida",
"T. T.",
""
]
] |
0705.0866 | Mihai Visinescu | Ion I. Cotaescu, Mihai Visinescu | Infinite loop superalgebras of the Dirac theory on the Euclidean
Taub-NUT space | 16 pages, LaTeX, references added | J.Phys.A40:11987-12000,2007 | 10.1088/1751-8113/40/39/018 | null | hep-th gr-qc math-ph math.MP | null | The Dirac theory in the Euclidean Taub-NUT space gives rise to a large
collection of conserved operators associated to genuine or hidden symmetries.
They are involved in interesting algebraic structures as dynamical algebras or
even infinite-dimensional algebras or superalgebras. One presents here the
infinite-dimensional superalgebra specific to the Dirac theory in manifolds
carrying the Gross-Perry-Sorkin monopole. It is shown that there exists an
infinite-dimensional superalgebra that can be seen as a twisted loop
superalgebra.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 08:14:04 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 05:27:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cotaescu",
"Ion I.",
""
],
[
"Visinescu",
"Mihai",
""
]
] |
0705.0867 | Eyal Lubetzky | Noga Alon, Eyal Lubetzky | Poisson approximation for non-backtracking random walks | 19 pages | null | null | null | math.PR math.CO | null | Random walks on expander graphs were thoroughly studied, with the important
motivation that, under some natural conditions, these walks mix quickly and
provide an efficient method of sampling the vertices of a graph. Alon,
Benjamini, Lubetzky and Sodin studied non-backtracking random walks on regular
graphs, and showed that their mixing rate may be up to twice as fast as that of
the simple random walk. As an application, they showed that the maximal number
of visits to a vertex, made by a non-backtracking random walk of length $n$ on
a high-girth $n$-vertex regular expander, is typically $(1+o(1))\frac{\log
n}{\log\log n}$, as in the case of the balls and bins experiment. They further
asked whether one can establish the precise distribution of the visits such a
walk makes.
In this work, we answer the above question by combining a generalized form of
Brun's sieve with some extensions of the ideas in Alon et al. Let $N_t$ denote
the number of vertices visited precisely $t$ times by a non-backtracking random
walk of length $n$ on a regular $n$-vertex expander of fixed degree and girth
$g$. We prove that if $g=\omega(1)$, then for any fixed $t$, $N_t/n$ is
typically $\frac{1}{\mathrm{e}t!}+o(1)$. Furthermore, if $g=\Omega(\log\log
n)$, then $N_t/n$ is typically $\frac{1+o(1)}{\mathrm{e}t!}$ uniformly on all
$t \leq (1-o(1))\frac{\log n}{\log\log n}$ and 0 for all $t \geq
(1+o(1))\frac{\log n}{\log\log n}$. In particular, we obtain the above result
on the typical maximal number of visits to a single vertex, with an improved
threshold window. The essence of the proof lies in showing that variables
counting the number of visits to a set of sufficiently distant vertices are
asymptotically independent Poisson variables.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 08:15:08 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Alon",
"Noga",
""
],
[
"Lubetzky",
"Eyal",
""
]
] |
0705.0868 | Enrique Velasco Dr | D. de las Heras, Y. Martinez-Raton and E. Velasco | Demixing and orientational ordering in mixtures of rectangular particles | 27 pages, 9 figures | Phys. Rev. E 76, 031704 (2007). | 10.1103/PhysRevE.76.031704 | null | cond-mat.soft cond-mat.stat-mech | null | Using scaled-particle theory for binary mixtures of two-dimensional hard
particles with rotational freedom, we analyse the stability of nematic phases
and the demixing phase behaviour of a variety of mixtures, focussing on cases
where at least one of the components consists of hard rectangles or hard
squares. A pure fluid of hard rectangles may exhibit, aside from the usual
uniaxial nematic phase, an additional (tetratic) oriented phase, possessing two
directors, which is the analogue of the biaxial or cubatic phases in three-
dimensional fluids. There is computer simulation evidence that the tetratic
phase might be stable with respect to phases with spatial order for rectangles
with low aspect ratios. As hard rectangles are mixed with other particles not
possessing stable tetratic order by themselves, the tetratic phase is
destabilised, via a first- or second-order phase transition, to uniaxial
nematic or isotropic phases; for hard rectangles of low aspect ratio tetratic
order persists in a relatively large range of volume fractions. The order of
these transitions depends on the particle geometry, dimensions and
thermodynamic conditions of the mixture. The second component of the mixture
has been chosen to be hard discs or disco-rectangles, the geometry of which is
different from that of rectangles, leading to packing frustration and demixing
behaviour, or simply rectangles of different aspect ratio. These mixtures may
be good candidates for observing thermodynamically stable tetratic phases in
monolayers of hard particles. Finally, demixing between fluid
(isotropic--tetratic or tetratic--tetratic) phases is seen to occur in mixtures
of hard squares of different sizes when the size ratio is sufficiently large.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 08:31:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Heras",
"D. de las",
""
],
[
"Martinez-Raton",
"Y.",
""
],
[
"Velasco",
"E.",
""
]
] |
0705.0869 | Wei Fang | W. Fang, and H. Cao | Wave interference effect on polymer microstadium laser | null | null | 10.1063/1.2762285 | null | physics.optics | null | We investigate the lasing modes in fully chaotic polymer microstadiums under
optical pumping. The lasing modes are regularly spaced in frequency, and their
amplitudes oscillate with frequency. Our numerical simulations reveal that the
lasing modes are multi-orbit scar modes. The interference of partial waves
propagating along the constituent orbits results in local maxima of quality
factor at certain frequencies. The observed modulation of lasing mode amplitude
with frequency results from the variation of quality factor, which provides the
direct evidence of wave interference effect in open chaotic microcavities.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 08:32:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fang",
"W.",
""
],
[
"Cao",
"H.",
""
]
] |
0705.0870 | Fotios (Fred) Nastos | F. Nastos and R. W. Newson and J. H\"ubner and J. E. Sipe and H. M.
van Driel | THz emission from ultrafast optical orientation | null | null | null | null | cond-mat.mtrl-sci | null | We show both theoretically and experimentally that the magnetization density
accompanying ultrafast excitation of a semiconductor with circular polarized
light varies rapidly enough to produce a detectable THz field.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 19:28:26 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Nastos",
"F.",
""
],
[
"Newson",
"R. W.",
""
],
[
"Hübner",
"J.",
""
],
[
"Sipe",
"J. E.",
""
],
[
"van Driel",
"H. M.",
""
]
] |
0705.0871 | David Dudal | David Dudal, Nele Vandersickel, Henri Verschelde | Unitarity analysis of a non-Abelian gauge invariant action with a mass | 36 pages | Phys.Rev.D76:025006,2007 | 10.1103/PhysRevD.76.025006 | null | hep-th | null | In previous work done by us and coworkers, we have been able to construct a
local, non-Abelian gauge invariant action with a mass parameter, based on the
nonlocal gauge invariant mass dimension two operator F1/D^2F. The
renormalizability of the resulting action was proven to all orders of
perturbation theory, in the class of linear covariant gauges. We also discussed
the perturbative equivalence of the model with ordinary massless Yang-Mills
gauge theories when the mass is identically zero. Furthermore, we pointed out
the existence of a BRST symmetry with corresponding nilpotent charge. In this
paper, we study the issue of unitarity of this massive gauge model. Firstly, we
provide a short review how to discuss the unitarity making use of the BRST
charge. Afterwards we make a detailed study of the most general version of our
action, and we come to the conclusion that the model is not unitary, as we are
unable to remove all the negative norm states from the physical spectrum in a
consistent way.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 08:59:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dudal",
"David",
""
],
[
"Vandersickel",
"Nele",
""
],
[
"Verschelde",
"Henri",
""
]
] |
0705.0872 | Sergei Bulanov V. | M. Kando, Y. Fukuda, A. S. Pirozhkov, J. Ma, I. Daito, L.-M. Chen, T.
Zh. Esirkepov, K. Ogura, T. Homma, Y. Hayashi, H. Kotaki, A. Sagisaka, M.
Mori, J. K. Koga, H. Daido, S. V. Bulanov, T. Kimura, Y. Kato and T. Tajima | Relativistic Tennis with Photons: Demonstration of Frequency Upshifting
by a Relativistic Flying Mirror through Two Colliding Laser Pulses | 17 pages, 5 figures | null | 10.1103/PhysRevLett.99.135001 | null | physics.plasm-ph physics.gen-ph | null | Since the advent of chirped pulse amplification1 the peak power of lasers has
grown dramatically and opened the new branch of high field science, delivering
the focused irradiance, electric fields of which drive electrons into the
relativistic regime. In a plasma wake wave generated by such a laser,
modulations of the electron density naturally and robustly take the shape of
paraboloidal dense shells, separated by evacuated regions, moving almost at the
speed of light. When we inject another counter-propagating laser pulse, it is
partially reflected from the shells, acting as relativistic flying
(semi-transparent) mirrors, producing an extremely time-compressed
frequency-multiplied pulse which may be focused tightly to the diffraction
limit. This is as if the counterstreaming laser pulse bounces off a
relativistically swung tennis racket, turning the ball of the laser photons
into another ball of coherent X-ray photons but with a form extremely
relativistically compressed to attosecond and zeptosecond levels. Here we
report the first demonstration of the frequency multiplication detected from
the reflection of a weak laser pulse in the region of the wake wave generated
by the driver pulse in helium plasma. This leads to the possibility of very
strong pulse compression and extreme coherent light intensification. This
Relativistic Tennis with photon beams is demonstrated leading to the
possibility toward reaching enormous electromagnetic field intensification and
finally approaching the Schwinger field, toward which the vacuum nonlinearly
warps and eventually breaks, producing electron-positron pairs.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 09:09:32 GMT"
},
{
"version": "v2",
"created": "Fri, 11 May 2007 02:34:22 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Kando",
"M.",
""
],
[
"Fukuda",
"Y.",
""
],
[
"Pirozhkov",
"A. S.",
""
],
[
"Ma",
"J.",
""
],
[
"Daito",
"I.",
""
],
[
"Chen",
"L. -M.",
""
],
[
"Esirkepov",
"T. Zh.",
""
],
[
"Ogura",
"K.",
""
],
[
"Homma",
"T.",
""
],
[
"Hayashi",
"Y.",
""
],
[
"Kotaki",
"H.",
""
],
[
"Sagisaka",
"A.",
""
],
[
"Mori",
"M.",
""
],
[
"Koga",
"J. K.",
""
],
[
"Daido",
"H.",
""
],
[
"Bulanov",
"S. V.",
""
],
[
"Kimura",
"T.",
""
],
[
"Kato",
"Y.",
""
],
[
"Tajima",
"T.",
""
]
] |
0705.0873 | Michael Hapgood | Mike Hapgood | Modelling long-term trends in lunar exposure to the Earth's plasmasheet | 20 pages, 6 figures, re-submitted to Annales Geophysicae, for an
animated version of Figure 1 see
http://uk.geocities.com/[email protected]/moon_movie_6.gif | Ann. Geophys., 25, 2037--2044, 2007 | 10.5194/angeo-25-2037-2007 | null | physics.space-ph | null | This paper shows how the exposure of the Moon to the Earth's plasmasheet is
subject to decadal variations due to lunar precession. The latter is a key
property of the Moon's apparent orbit around the Earth - the nodes of that
orbit precess around the ecliptic, completing one revolution every 18.6 years.
This precession is responsible for a number of astronomical phenomena, e.g. the
year to year drift of solar and lunar eclipse periods. It also controls the
ecliptic latitude at which the Moon crosses the magnetotail and thus the number
and duration of lunar encounters with the plasmasheet. This paper presents a
detailed model of those encounters and applies it to the period 1960 to 2030.
This shows that the total lunar exposure to the plasmasheet will vary from 10
hours per month at a minimum of the eighteen-year cycle rising to 40 hours per
month at the maximum. These variations could have a profound impact on the
accumulation of charge due plasmasheet electrons impacting the lunar surface.
Thus we should expect the level of lunar surface charging to vary over the
eighteen-year cycle. The literature contains reports that support this: several
observations made during the cycle maximum of 1994-2000 are attributed to
bombardment and charging of the lunar surface by plasmasheet electrons. Thus we
conclude that lunar surface charging will vary markedly over an eighteen-year
cycle driven by lunar precession. It is important to interpret lunar
environment measurements in the context of this cycle and to allow for the
cycle when designing equipment for deployment on the lunar surface. This is
particularly important in respect of developing plans for robotic exploration
on the lunar surface during the next cycle maximum of 2012-19.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 09:10:54 GMT"
},
{
"version": "v2",
"created": "Tue, 31 Jul 2007 12:47:42 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Hapgood",
"Mike",
""
]
] |
0705.0874 | Khaled Qazaqzeh Mr | K. Qazaqzeh | The Witten-Reshetikhin-Turaev Invariants of Lens Spaces | 10 pages | null | null | null | math.GT | null | We derive an explicit formula for the Witten-Reshetikhin-Turaev
SO(3)-invariants of lens spaces. We use the representation of the mapping class
group of the torus corresponding to the Witten-Reshetikhin-Turaev SO(3)-TQFT to
give such formula.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 09:35:35 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Qazaqzeh",
"K.",
""
]
] |
0705.0875 | Yasuhiro Tsubo | Yasuhiro Tsubo, Jun-nosuke Teramae, and Tomoki Fukai | Synchronization of Excitatory Neurons with Strongly Heterogeneous Phase
Responses | 4 pages, 3 figures | null | 10.1103/PhysRevLett.99.228101 | null | nlin.PS | null | In many real-world oscillator systems, the phase response curves are highly
heterogeneous. However, dynamics of heterogeneous oscillator networks has not
been seriously addressed. We propose a theoretical framework to analyze such a
system by dealing explicitly with the heterogeneous phase response curves. We
develop a novel method to solve the self-consistent equations for order
parameters by using formal complex-valued phase variables, and apply our theory
to networks of in vitro cortical neurons. We find a novel state transition that
is not observed in previous oscillator network models.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 09:50:15 GMT"
},
{
"version": "v2",
"created": "Tue, 31 Jul 2007 08:12:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tsubo",
"Yasuhiro",
""
],
[
"Teramae",
"Jun-nosuke",
""
],
[
"Fukai",
"Tomoki",
""
]
] |
0705.0876 | V. N. Zavaritsky | V.N. Zavaritsky | Comment on `Intrinsic tunnelling spectroscopy of
Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$: The junction-size dependence of
self-heating'[Phys.Rev.B 73, 224501 (2006)] | PRB, under consideration | null | null | null | cond-mat.supr-con | null | The recent PRB 73, 224501 (2006) henceforth referred as Ref.\cite{0} asserts
that self-heating decreases with sample area reduction and claims to identify
the intrinsic cause of ITS in submicrometre `mesa'. I will show that this
assertion lacks substantiation. I will further demonstrate that one and the
same $R(T)$ and the parameter-free Newton's Law of Cooling describe
quantitatively a rich variety of ITS behaviours taken by Ref.\cite{0} above and
below $T_c$ at bath temperatures spanned over 150K. Thus this finding presents
strong evidence in favour of heating as the cause of the `intrinsic tunnelling
spectra' (ITS) promoted by Ref.\cite{0}.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 09:53:23 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Zavaritsky",
"V. N.",
""
]
] |
0705.0877 | Robert Mutel | R. L. Mutel, W. M. Peterson, T. R. Jaeger, and J. D. Scudder | Dependence of CMI Growth Rates on Electron Velocity Distributions and
Perturbation by Solitary Waves | 21 pages, 11 figures. J. Geophys. Res. 2007 (accepted) | null | 10.1029/2007JA012442 | null | astro-ph | null | We calculate growth rates and corresponding gains for RX and LO mode
radiation associated with the cyclotron maser instability for parameterized
horseshoe electron velocity distributions. The velocity distribution function
was modeled to closely fit the electron distribution functions observed in the
auroral cavity. We systematically varied the model parameters as well as the
propagation direction to study the dependence of growth rates on model
parameters. The growth rate depends strongly on loss cone opening angle, which
must be less than $90^{o}$ for significant CMI growth. The growth rate is
sharply peaked for perpendicular radiation ($k_{\parallel} = 0$), with a
full-width at half-maximum $1.7^{o}$, in good agreement with observed k-vector
orientations and numerical simulations. The fractional bandwidth varied between
10$^{-4}$ and 10$^{-2}$, depending most strongly on propagation direction. This
range encompasses nearly all observed fractional AKR burst bandwidths. We find
excellent agreement between the computed RX mode emergent intensities and
observed AKR intensities assuming convective growth length $L_c\approx$20-40 km
and group speed 0.15$c$. The only computed LO mode growth rates compatible
observed LO mode radiation levels occurred for number densities more than 100
times the average energetic electron densities measured in auroral cavities.
This implies that LO mode radiation is not produced directly by the CMI
mechanism but more likely results from mode conversion of RX mode radiation. We
find that perturbation of the model velocity distribution by large ion solitary
waves (ion holes) can enhance the growth rate by a factor of 2-4. This will
result in a gain enhancement more than 40 dB depending on the convective growth
length within the structure. Similar enhancements may be caused by EMIC waves.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 09:54:13 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Mutel",
"R. L.",
""
],
[
"Peterson",
"W. M.",
""
],
[
"Jaeger",
"T. R.",
""
],
[
"Scudder",
"J. D.",
""
]
] |
0705.0878 | Ralf-Dieter Scholz | N.V. Kharchenko, R.-D. Scholz, A.E. Piskunov, S. R\"oser, E. Schilbach | Astrophysical supplements to the ASCC-2.5. Ia. Radial velocities of
about 55000 stars and mean radial velocities of 516 Galactic open clusters
and associations | 8 pages, 5 figures, accepted for publication in AN | null | 10.1002/asna.200710776 | null | astro-ph | null | We present the 2nd version of the Catalogue of Radial Velocities with
Astrometric Data (CRVAD-2). This is the result of the cross-identification of
stars from the All-Sky Compiled Catalogue of 2.5 Million Stars (ASCC-2.5) with
the General Catalogue of Radial Velocities and with other recently published
radial velocity lists and catalogues. The CRVAD-2 includes accurate J2000
equatorial coordinates, proper motions and trigonometric parallaxes in the
Hipparcos system, $B, V$ photometry in the Johnson system, spectral types,
radial velocities (RVs), multiplicity and variability flags for 54907 ASCC-2.5
stars. We have used the CRVAD-2 for a new determination of mean RVs of 363 open
clusters and stellar associations considering their established members from
proper motions and photometry in the ASCC-2.5. For 330 clusters and
associations we compiled previously published mean RVs from the literature,
critically reviewed and partly revised them. The resulting Catalogue of Radial
Velocities of Open Clusters and Associations (CRVOCA) contains about 460 open
clusters and about 60 stellar associations in the Solar neighbourhood. These
numbers still represent less than 30% of the total number of about 1820 objects
currently known in the Galaxy. The mean RVs of young clusters are generally
better known than those of older ones.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 10:00:43 GMT"
}
] | 2016-08-14T00:00:00 | [
[
"Kharchenko",
"N. V.",
""
],
[
"Scholz",
"R. -D.",
""
],
[
"Piskunov",
"A. E.",
""
],
[
"Röser",
"S.",
""
],
[
"Schilbach",
"E.",
""
]
] |
0705.0879 | Hung The Diep | K. Akabli, H. T. Diep and S. Reynal | Spin transport in magnetic multilayers | 8 pages, 17 figures, submitted to J. Phys.: Cond Matter | null | 10.1088/0953-8984/19/35/356204 | null | cond-mat.stat-mech | null | We study by extensive Monte Carlo simulations the transport of itinerant
spins travelling inside a multilayer composed of three ferromagnetic films
antiferromagnetically coupled to each other in a sandwich structure. The two
exterior films interact with the middle one through non magnetic spacers. The
spin model is the Ising one and the in-plane transport is considered. Various
interactions are taken into account. We show that the current of the itinerant
spins going through this system depends strongly on the magnetic ordering of
the multilayer: at temperatures $T$ below (above) the transition temperature
$T_c$, a strong (weak) current is observed. This results in a strong jump of
the resistance across $T_c$. Moreover, we observe an anomalous variation,
namely a peak, of the spin current in the critical region just above $T_c$. We
show that this peak is due to the formation of domains in the temperature
region between the low-$T$ ordered phase and the true paramagnetic disordered
phase. The existence of such domains is known in the theory of critical
phenomena. The behavior of the resistance obtained here is compared to a recent
experiment. An excellent agreement with our physical interpretation is
observed. We also show and discuss effects of various physical parameters
entering our model such as interaction range, strength of electric and magnetic
fields and magnetic film and non magnetic spacer thicknesses.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 10:42:30 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Akabli",
"K.",
""
],
[
"Diep",
"H. T.",
""
],
[
"Reynal",
"S.",
""
]
] |
0705.0880 | David Blotti\`ere | David Blottiere (appendice d'Andrey Levin) | Realisation de Hodge du polylogarithme d'un schema abelien | Appendice d'Andrey Levin ajoute | null | null | null | math.AG | null | The main result of this article is the fact that the currents defined by
Levin give a description of the polylogarithm of an abelian scheme at the
topological level. This result was a conjecture of Levin. This provides a
method to explicit the Eisenstein classes of an abelian scheme at the
topological level. These classes are of special interest since they have a
motivic origin by a theorem of Kings. In a forthcoming article, we use the main
result of this paper to prove that the Eisenstein classes of the universal
abelian scheme over an Hilbert-Blumenthal variety degenerate at the boundary of
the Baily-Borel compactification of the base in a special value of an
$L$-function associated to the underlying totally real number field. As a
corollary, we get a non vanishing result for some of these Eisenstein classes
in this geometric situation.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 10:44:31 GMT"
},
{
"version": "v2",
"created": "Fri, 18 May 2007 05:49:23 GMT"
},
{
"version": "v3",
"created": "Tue, 15 Jan 2008 02:18:18 GMT"
},
{
"version": "v4",
"created": "Thu, 17 Jan 2008 12:46:59 GMT"
},
{
"version": "v5",
"created": "Fri, 2 May 2008 14:01:01 GMT"
}
] | 2008-05-02T00:00:00 | [
[
"Blottiere",
"David",
"",
"appendice d'Andrey Levin"
]
] |
0705.0881 | Vladimir Ivashchuk | V. D. Ivashchuk | S-brane solutions with orthogonal intersection rules | 10 pages, Latex, invited paper to a fest of A. Garsia; typo in eq.
(3.4) is eliminated | Gen.Rel.Grav.37:751-758,2005 | 10.1007/s10714-005-0070-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A family of generalized composite intersecting S-brane solutions with
orthogonal intersection rules is described.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 11:00:36 GMT"
},
{
"version": "v2",
"created": "Sun, 30 Oct 2011 16:29:45 GMT"
}
] | 2011-11-01T00:00:00 | [
[
"Ivashchuk",
"V. D.",
""
]
] |
0705.0882 | Frolov Igor | I. E. Frolov and V. Ch. Zhukovsky | Synchrotron Radiation in the Standard Model Extension | 14 pages, 2 figures | J.Phys.A40:10625-10640,2007 | 10.1088/1751-8113/40/34/017 | null | hep-th | null | We obtain a system of exact solutions of the Dirac equation for an electron
moving in a constant homogeneous external magnetic field with account of its
vacuum magnetic moment and assumed Lorentz invariance violation in the minimal
CPT-odd form in the framework of the Standard Model Extension. Using these
solutions, characteristics of the particle synchrotron radiation are
calculated, and possible observable effects caused by the Lorentz non-invariant
interaction are described. We demonstrate that the angular distribution of the
radiation has specific asymmetry, which can be explained as a consequence of
non-conservation of transversal electron polarization in the presence of a
background Lorentz non-invariant condensate field.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 11:04:01 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 18:00:48 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Frolov",
"I. E.",
""
],
[
"Zhukovsky",
"V. Ch.",
""
]
] |
0705.0883 | Guenther Ruediger | G. Ruediger, R. Hollerbach | Comment on "Helical MRI in magnetized Taylor-Couette flow" | 2 pages, 2 figures, submitted to Phys. Rev. E (comments) | null | null | null | astro-ph | null | Liu et al. [Phys. Rev. E 74, 056302 (2006)] have presented a WKB analysis of
the helical magnetorotational instability (HMRI), and claim that it does not
exist for Keplerian rotation profiles. We show that if radial boundary
conditions are included, the HMRI can exist even for rotation profiles as flat
as Keplerian, provided only that at least one of the boundaries is sufficiently
conducting.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 11:04:03 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 05:21:42 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ruediger",
"G.",
""
],
[
"Hollerbach",
"R.",
""
]
] |
0705.0884 | Zaven Akopov N | N. Akopov, L. Grigoryan, Z. Akopov | Possible influence of the two string events on the hadron formation in a
nuclear environment | null | Eur.Phys.J.C52:893-898,2007 | 10.1140/epjc/s10052-007-0417-1 | null | hep-ph | null | One of the basic assumptions of the string model is that as a result of a DIS
in nucleus a single string arises, which then breaks into hadrons. However the
pomeron exchange considered in this work, leads to the production of two
strings in the one event. The hadrons produced in these events have smaller
formation lengths, than those with the same energy produced in the single
string events. As a consequence, they undergo more substantial absorption in
the nuclear matter.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 11:04:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Akopov",
"N.",
""
],
[
"Grigoryan",
"L.",
""
],
[
"Akopov",
"Z.",
""
]
] |
0705.0885 | Wouter Vlemmings | W.H.T. Vlemmings | A Review of Maser Polarization and Magnetic Fields | 10 pages, Review paper from IAU symposium 242 "Astrophysical Masers
and their Environments" | null | 10.1017/S1743921307012549 | null | astro-ph | null | Through polarization observations masers are unique probes of the magnetic
field in a variety of different astronomical objects, with the different maser
species tracing different physical conditions. In recent years maser
polarization observations have provided insights in the magnetic field strength
and morphology in, among others, the envelopes around evolved stars, Planetary
Nebulae (PNe), massive star forming regions and supernova remnants. More
recently, maser observations have even been used to determine the magnetic
field in megamaser galaxies. This review will present an overview of maser
polarization observations and magnetic field determinations of the last several
years and discuss the implications of the magnetic field measurements for
several important fields of study, such as aspherical PNe creation and massive
star formation.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 11:11:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Vlemmings",
"W. H. T.",
""
]
] |
0705.0886 | Jens Hjorleifur Bardarson | J. H. Bardarson, J. Tworzyd{\l}o, P. W. Brouwer, and C. W. J.
Beenakker | Demonstration of one-parameter scaling at the Dirac point in graphene | 4 pages, 5 figures; v2: introduction expanded, data for Gaussian
model extended to larger system sizes to further demonstrate single parameter
scaling | Phys.Rev.Lett. 99, 106801 (2007) | 10.1103/PhysRevLett.99.106801 | null | cond-mat.mes-hall | null | We numerically calculate the conductivity $\sigma$ of an undoped graphene
sheet (size $L$) in the limit of vanishingly small lattice constant. We
demonstrate one-parameter scaling for random impurity scattering and determine
the scaling function $\beta(\sigma)=d\ln\sigma/d\ln L$. Contrary to a recent
prediction, the scaling flow has no fixed point ($\beta>0$) for conductivities
up to and beyond the symplectic metal-insulator transition. Instead, the data
supports an alternative scaling flow for which the conductivity at the Dirac
point increases logarithmically with sample size in the absence of intervalley
scattering -- without reaching a scale-invariant limit.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 11:17:51 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Jun 2007 13:03:00 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Bardarson",
"J. H.",
""
],
[
"Tworzydło",
"J.",
""
],
[
"Brouwer",
"P. W.",
""
],
[
"Beenakker",
"C. W. J.",
""
]
] |
0705.0887 | Elina Nieppola | E. Nieppola, M. Tornikoski, A. L\"ahteenm\"aki, E. Valtaoja, T.
Hakala, T. Hovatta, M. Kotiranta, S. Nummila, T. Ojala, M. Parviainen, M.
Ranta, P.-M. Saloranta, I. Torniainen, M. Tr\"oller | 37 GHz observations of a large sample of BL Lacertae objects | 12 pages, 5 figures + 5 tables. Published in Astronomical Journal | Astron.J.133:1947-1953,2007 | 10.1086/512609 | null | astro-ph | null | We present 37 GHz data obtained at Metsahovi Radio Observatory in 2001
December - 2005 April for a large sample of BL Lacertae objects. We also report
the mean variability indices and radio spectral indices in frequency intervals
5 - 37 GHz and 37 - 90 GHz. Approximately 34 % of the sample was detected at 37
GHz, 136 BL Lacertae objects in all. A large majority of the detected sources
were low-energy BL Lacs (LBLs). The variability index values of the sample were
diverse, the mean fractional variability of the sample being \Delta S_2 = 0.31.
The spectral indices also varied widely, but the average radio spectrum of the
sample sources is flat. Our observations show that many of the high-energy BL
Lacs (HBL), which are usually considered radio-quiet, can at times be detected
at 37 GHz.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 11:48:53 GMT"
}
] | 2010-11-05T00:00:00 | [
[
"Nieppola",
"E.",
""
],
[
"Tornikoski",
"M.",
""
],
[
"Lähteenmäki",
"A.",
""
],
[
"Valtaoja",
"E.",
""
],
[
"Hakala",
"T.",
""
],
[
"Hovatta",
"T.",
""
],
[
"Kotiranta",
"M.",
""
],
[
"Nummila",
"S.",
""
],
[
"Ojala",
"T.",
""
],
[
"Parviainen",
"M.",
""
],
[
"Ranta",
"M.",
""
],
[
"Saloranta",
"P. -M.",
""
],
[
"Torniainen",
"I.",
""
],
[
"Tröller",
"M.",
""
]
] |
0705.0888 | Behrouz Mirza | Somayeh Asgarani, Behrouz Mirza | Quasi-additivity of Tsallis entropies and correlated subsystems | 12 pages | Physica A 379 (2007) 513-522 | 10.1016/j.physa.2007.02.033 | null | cond-mat.stat-mech | null | We use Beck's quasi-additivity of Tsallis entropies for $n$ independent
subsystems to show that like the case of $n=2$, the entropic index $q$
approaches 1 by increasing system size. Then, we will generalize that concept
to correlated subsystems to find that in the case of correlated subsystems,
when system size increases, $q$ also approaches a value corresponding to the
additive case.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 11:33:34 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Asgarani",
"Somayeh",
""
],
[
"Mirza",
"Behrouz",
""
]
] |
0705.0889 | Sohrab Rahvar | M. Sadegh Movahed, Shant Baghram and Sohrab Rahvar | Consistency of $f(R)=\sqrt{R^{2}-R_{0}^2}$ Gravity with the Cosmological
Observations in Palatini Formalism | 12 pages, 7 figures | Phys.Rev.D76:044008,2007 | 10.1103/PhysRevD.76.044008 | null | astro-ph hep-th | null | In this work we study the dynamics of universe in $f(R)=\sqrt{R^2-R_{0}^2}$
modified gravity with Palatini formalism. We use data from recent observations
as Supernova Type Ia (SNIa) Gold sample and Supernova Legacy Survey (SNLS)
data, size of baryonic acoustic peak from Sloan Digital Sky Survey (SDSS), the
position of the acoustic peak from the CMB observations and large scale
structure formation (LSS) from the 2dFGRS survey to put constraint on the
parameters of the model. To check the consistency of this action, we compare
the age of old cosmological objects with the age of universe. In the combined
analysis with the all the observations, we find the parameters of model as
$R_0=6.192_{-0.177}^{+0.167}\times H_0^2$ and
$\Omega_m=0.278_{-0.278}^{+0.273}$.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 11:36:24 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Movahed",
"M. Sadegh",
""
],
[
"Baghram",
"Shant",
""
],
[
"Rahvar",
"Sohrab",
""
]
] |
0705.0890 | Charlotte Kristjansen | P. Y. Casteill (NBI) and C. Kristjansen (NBI and NORDITA) | The Strong Coupling Limit of the Scaling Function from the Quantum
String Bethe Ansatz | 18 pages, one figure, v2: footnote changed, v3: reference added, typo
corrected | Nucl.Phys.B785:1-18,2007 | 10.1016/j.nuclphysb.2007.06.011 | NORDITA-2007-14 | hep-th | null | Using the quantum string Bethe ansatz we derive the one-loop energy of a
folded string rotating with angular momenta (S,J) in AdS_3 x S^1 inside AdS_5 x
S^5 in the limit 1 << J << S, z=\lambda^(1/2) log(S/J) /(\pi J) fixed. The
one-loop energy is a sum of two contributions, one originating from the
Hernandez-Lopez phase and another one being due to spin chain finite size
effects. We find a result which at the functional level exactly matches the
result of a string theory computation. Expanding the result for large z we
obtain the strong coupling limit of the scaling function for low twist, high
spin operators of the SL(2) sector of N=4 SYM. In particular we recover the
famous -3 log(2)/\pi. Its appearance is a result of non-trivial cancellations
between the finite size effects and the Hernandez-Lopez correction.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 11:46:14 GMT"
},
{
"version": "v2",
"created": "Fri, 25 May 2007 13:38:35 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Sep 2007 12:52:53 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Casteill",
"P. Y.",
"",
"NBI"
],
[
"Kristjansen",
"C.",
"",
"NBI and NORDITA"
]
] |
0705.0891 | Dietrich Stauffer | D. Stauffer | Opinion Dynamics and Sociophysics | Draft for: Encyclopedia of Complexist and System Science (Springer);
18 p | null | null | null | physics.soc-ph | null | No abstract given. Contents:
I. Definition and Introduction
II. Schelling Model
III. Opinion Dynamics
IV. Languages, Hierarchies and Football
V. Future Directions
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 11:56:47 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Stauffer",
"D.",
""
]
] |
0705.0892 | Valery Lyubovitskij | Amand Faessler, Thomas Gutsche, Sergey Kovalenko, Valery E.
Lyubovitskij | Ds0*(2317) and Ds1(2460) mesons in two-body B-meson decays | 12 pages, 2 figures | Phys.Rev.D76:014003,2007 | 10.1103/PhysRevD.76.014003 | null | hep-ph | null | We analyze the branching ratios of B to D(*) + Ds0*(Ds1) decays using the
factorization hypothesis. The B to D(*) transition form factors are taken from
a model-independent analysis done by Caprini, Lellouch and Neubert based on
heavy quark spin symmetry and dispersive constraints, including short-distance
and power corrections. The leptonic decay constants fDs0* and fDs1 are
calculated assuming a molecular structure for the Ds0* and Ds1 mesons. The
calculated branching ratios of B-meson two-body decays are compared with
experimental data and other theoretical results.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 12:58:15 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jul 2007 14:30:03 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Faessler",
"Amand",
""
],
[
"Gutsche",
"Thomas",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"Lyubovitskij",
"Valery E.",
""
]
] |
0705.0893 | David Andelman | Dan Ben-Yaakov, Yoram Burak, David Andelman, S. A. Safran | Electrostatic Interactions of Asymmetrically Charged Membranes | null | Europhys. Lett., 79, 48002 (2007) | 10.1209/0295-5075/79/48002 | null | cond-mat.soft cond-mat.stat-mech | null | We predict the nature (attractive or repulsive) and range (exponentially
screened or long-range power law) of the electrostatic interactions of
oppositely charged and planar plates as a function of the salt concentration
and surface charge densities (whose absolute magnitudes are not necessarily
equal). An analytical expression for the crossover between attractive and
repulsive pressure is obtained as a function of the salt concentration. This
condition reduces to the high-salt limit of Parsegian and Gingell where the
interaction is exponentially screened and to the zero salt limit of Lau and
Pincus in which the important length scales are the inter-plate separation and
the Gouy-Chapman length. In the regime of low salt and high surface charges we
predict - for any ratio of the charges on the surfaces - that the attractive
pressure is long-ranged as a function of the spacing. The attractive pressure
is related to the decrease in counter-ion concentration as the inter-plate
distance is decreased. Our theory predicts several scaling regimes with
different scaling expressions for the pressure as function of salinity and
surface charge densities. The pressure predictions can be related to surface
force experiments of oppositely charged surfaces that are prepared by coating
one of the mica surfaces with an oppositely charged polyelectrolyte.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 12:10:28 GMT"
}
] | 2012-01-31T00:00:00 | [
[
"Ben-Yaakov",
"Dan",
""
],
[
"Burak",
"Yoram",
""
],
[
"Andelman",
"David",
""
],
[
"Safran",
"S. A.",
""
]
] |
0705.0894 | Robert Izzard | Robert G. Izzard (1,3), C. Simon Jeffery (2) and John Lattanzio (3)
((1) University of Utrecht, The Netherlands, (2) Armagh Observatory, Northern
Ireland, (3) Monash University, Melbourne, Australia) | Origin of the early-type R stars: a binary-merger solution to a
century-old problem? | 17 Pages, accepted for publication in A&A | null | 10.1051/0004-6361:20077457 | null | astro-ph | null | The early-R stars are carbon-rich K-type giants. They are enhanced in C12,
C13 and N14, have approximately solar oxygen, magnesium isotopes, s-process and
iron abundances, have the luminosity of core-helium burning stars, are not
rapid rotators, are members of the Galactic thick disk and, most peculiarly of
all, are all single stars. Conventional single-star stellar evolutionary models
cannot explain such stars, but mergers in binary systems have been proposed to
explain their origin.
We have synthesized binary star populations to calculate the number of merged
stars with helium cores which could be early-R stars. We find many possible
evolutionary channels. The most common of which is the merger of a helium white
dwarf with a hydrogen-burning red giant branch star during a common envelope
phase followed by a helium flash in a rotating core which mixes carbon to the
surface. All the channels together give ten times more early-R stars than we
require to match recent Hipparcos observations - we discuss which channels are
likely to be the true early-R stars and which are not. For the first time we
have constructed a viable model of the early-R stars with which we can test
some of our ideas regarding common envelope evolution in giants, stellar
mergers, rotation, the helium flash and the origin of the early-R stars.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 12:14:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Izzard",
"Robert G.",
""
],
[
"Jeffery",
"C. Simon",
""
],
[
"Lattanzio",
"John",
""
]
] |
0705.0895 | Chazottes | C. Bonanno, J.-R. Chazottes, P. Collet | Epsilon-Distortion Complexity for Cantor Sets | null | null | null | null | math.DS cs.CC math.MG | null | We define the epsilon-distortion complexity of a set as the shortest program,
running on a universal Turing machine, which produces this set at the precision
epsilon in the sense of Hausdorff distance. Then, we estimate the
epsilon-distortion complexity of various central Cantor sets on the line
generated by iterated function systems (IFS's). In particular, the
epsilon-distortion complexity of a C^k Cantor set depends, in general, on k and
on its box counting dimension, contrarily to Cantor sets generated by
polynomial IFS or random affine Cantor sets.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 12:16:57 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bonanno",
"C.",
""
],
[
"Chazottes",
"J. -R.",
""
],
[
"Collet",
"P.",
""
]
] |
0705.0896 | Artorix de la Cruz de Ona | Artorix de la Cruz de Ona | Variational speed selection for the interface propagation in
superconductors | 4 pages, 3 Figures | null | null | null | cond-mat.supr-con cond-mat.mtrl-sci | null | We study the interface propagation in superconductors by means of a
variational method. We compute the lower and upper bounds for which the planar
front speed propagation is valid. To take into account delay or memory effects
in the front propagation, an hyperbolic differential equation is introduced as
an extension of the model.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 12:22:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"de Ona",
"Artorix de la Cruz",
""
]
] |
0705.0897 | Leonid A. Openov | L.A.Openov, I.V.Davydov, A.I.Podlivaev | Stability of C20 fullerene chains | To appear in JETP Letters | JETP Letters 85, 339 (2007) | 10.1134/S0021364007070089 | null | cond-mat.mes-hall | null | The stability of (C20)N chains with N = 3 - 7 is analyzed by numerical
simulation using a tight-binding potential and molecular dynamics. Various
channels of losing the cluster-chain structure of the (C20)N complexes are
observed, including the decay of C20 clusters, their coalescence, and the
separation of one C20 fullerene from the chain.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 12:33:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Openov",
"L. A.",
""
],
[
"Davydov",
"I. V.",
""
],
[
"Podlivaev",
"A. I.",
""
]
] |
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