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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0707.2430 | Bertrand Berche | Lev Shchur (LITP), Bertrand Berche (LPM), Paolo Butera (INFN) | A study of logarithmic corrections and universal amplitude ratios in the
two-dimensional 4-state Potts model | null | Europhys.Lett.81:30008,2008 | 10.1209/0295-5075/81/30008 | null | cond-mat.stat-mech hep-lat hep-th | null | Monte Carlo (MC) and series expansion (SE) data for the energy, specific
heat, magnetization and susceptibility of the two-dimensional 4-state Potts
model in the vicinity of the critical point are analysed. The role of
logarithmic corrections is discussed and an approach is proposed in order to
account numerically for these corrections in the determination of critical
amplitudes. Accurate estimates of universal amplitude ratios $A_+/A_-$,
$\Gamma_+/\Gamma_-$, $\Gamma_T/\Gamma_-$ and $R_C^\pm$ are given, which arouse
new questions with respect to previous works.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 04:48:23 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Dec 2007 07:47:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Shchur",
"Lev",
"",
"LITP"
],
[
"Berche",
"Bertrand",
"",
"LPM"
],
[
"Butera",
"Paolo",
"",
"INFN"
]
] |
0707.2431 | Vikram Zaveri | Vikram H. Zaveri | Quarkonium and hydrogen spectra with spin dependent relativistic wave
equation | 14 pages, v7: Journal reference added | PRAMANA -- J. Phys. v.75(4), (2010), 579--598 | 10.1007/s12043-010-0140-6 | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A non-linear non-perturbative relativistic atomic theory introduces spin in
the dynamics of particle motion. The resulting energy levels of Hydrogen atom
are exactly same as the Dirac theory. The theory accounts for the energy due to
spin-orbit interaction and for the additional potential energy due to spin and
spin-orbit coupling. Spin angular momentum operator is integrated into the
equation of motion. This requires modification to classical Laplacian operator.
Consequently the Dirac matrices and the k operator of Dirac's theory are
dispensed with. The theory points out that the curvature of the orbit draws on
certain amount of kinetic and potential energies affecting the momentum of
electron and the spin-orbit interaction energy constitutes a part of this
energy. The theory is developed for spin 1/2 bound state single electron in
Coulomb potential and then further extended to quarkonium physics by
introducing the linear confining potential. The unique feature of this
quarkonium model is that the radial distance can be exactly determined and does
not have a statistical interpretation. The established radial distance is then
used to determine the wave function. The observed energy levels are used as the
input parameters and the radial distance and the string tension are predicted.
This ensures 100% conformance to all observed energy levels for the heavy
quarkonium.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 04:51:20 GMT"
},
{
"version": "v2",
"created": "Sat, 22 Mar 2008 09:10:25 GMT"
},
{
"version": "v3",
"created": "Fri, 16 May 2008 04:42:54 GMT"
},
{
"version": "v4",
"created": "Thu, 29 May 2008 16:26:34 GMT"
},
{
"version": "v5",
"created": "Tue, 17 Mar 2009 09:18:15 GMT"
},
{
"version": "v6",
"created": "Fri, 21 May 2010 07:09:04 GMT"
},
{
"version": "v7",
"created": "Tue, 25 Nov 2014 07:17:20 GMT"
}
] | 2014-11-26T00:00:00 | [
[
"Zaveri",
"Vikram H.",
""
]
] |
0707.2432 | Erhan Bayraktar | Erhan Bayraktar, Hao Xing | Pricing Asian Options for Jump Diffusions | Key Words: Pricing Asian Options, Jump diffusions, an Iterative
Numerical Scheme, Classical Solutions of Integro-PDEs | null | null | null | cs.CE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a sequence of functions that uniformly converge (on compact
sets) to the price of Asian option, which is written on a stock whose dynamics
follows a jump diffusion, exponentially fast. Each of the element in this
sequence solves a parabolic partial differen- tial equation (not an
integro-differential equation). As a result we obtain a fast numerical
approximation scheme whose accuracy versus speed characteristics can be
controlled. We analyze the performance of our numerical algorithm on several
examples.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 04:55:18 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Oct 2007 17:35:45 GMT"
},
{
"version": "v3",
"created": "Thu, 6 Dec 2007 03:04:13 GMT"
},
{
"version": "v4",
"created": "Sat, 12 Jan 2008 18:28:58 GMT"
},
{
"version": "v5",
"created": "Thu, 22 May 2008 02:58:57 GMT"
},
{
"version": "v6",
"created": "Sun, 15 Jun 2008 21:36:58 GMT"
},
{
"version": "v7",
"created": "Wed, 29 Oct 2008 13:49:51 GMT"
}
] | 2008-10-29T00:00:00 | [
[
"Bayraktar",
"Erhan",
""
],
[
"Xing",
"Hao",
""
]
] |
0707.2433 | Marcel Mudrich Dr. | M. Mudrich, B. Forkl, S. Mueller, M. Dvorak, O. Buenermann, F.
Stienkemeier | Kilohertz laser ablation for doping helium nanodroplets | null | Rev. Sci. Instr. 78 , 103106 (2007) | 10.1063/1.2796849 | null | physics.atm-clus | null | A new setup for doping helium nanodroplets by means of laser ablation at
kilohertz repetition rate is presented. The doping process is characterized and
two distinct regimes of laser ablation are identified. The setup is shown to be
efficient and stable enough to be used for spectroscopy, as demonstrated on
beam-depletion spectra of lithium atoms attached to helium nanodroplets. For
the first time, helium droplets are doped with high temperature refractory
materials such as titanium and tantalum. Doping with the non-volatile DNA basis
Guanine is found to be efficient and a number of oligomers are detected.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 05:02:40 GMT"
}
] | 2011-12-19T00:00:00 | [
[
"Mudrich",
"M.",
""
],
[
"Forkl",
"B.",
""
],
[
"Mueller",
"S.",
""
],
[
"Dvorak",
"M.",
""
],
[
"Buenermann",
"O.",
""
],
[
"Stienkemeier",
"F.",
""
]
] |
0707.2434 | A. Bashir | A. Bashir, Y. Concha-Sanchez and R. Delbourgo | 3-point off-shell vertex in scalar QED in arbitrary gauge and dimension | Uses axodraw | Phys.Rev.D76:065009,2007 | 10.1103/PhysRevD.76.065009 | null | hep-th | null | We calculate the complete one-loop off-shell three-point scalar-photon vertex
in arbitrary gauge and dimension for Scalar Quantum Electrodynamics. Explicit
results are presented for the particular cases of dimensions 3 and 4 both for
massive and massless scalars. We then propose non-perturbative forms of this
vertex that coincide with the perturbative answer to order $e^2$.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 05:12:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bashir",
"A.",
""
],
[
"Concha-Sanchez",
"Y.",
""
],
[
"Delbourgo",
"R.",
""
]
] |
0707.2435 | Vicente Delgado | A. Mu\~noz Mateo and V. Delgado (Univ. de La Laguna) | Effective mean-field equations for cigar-shaped and disk-shaped
Bose-Einstein condensates | 11 pages, 7 figures; Final version published in Phys. Rev. A;
Manuscript put in the archive and submitted to Phys. Rev. A on 17 July 2007 | Phys. Rev. A 77, 013617 (2008) | 10.1103/PhysRevA.77.013617 | null | cond-mat.other | null | By applying the standard adiabatic approximation and using the accurate
analytical expression for the corresponding local chemical potential obtained
in our previous work [Phys. Rev. A \textbf{75}, 063610 (2007)] we derive an
effective 1D equation that governs the axial dynamics of mean-field
cigar-shaped condensates with repulsive interatomic interactions, accounting
accurately for the contribution from the transverse degrees of freedom. This
equation, which is more simple than previous proposals, is also more accurate.
Moreover, it allows treating condensates containing an axisymmetric vortex with
no additional cost. Our effective equation also has the correct limit in both
the quasi-1D mean-field regime and the Thomas-Fermi regime and permits one to
derive fully analytical expressions for ground-state properties such as the
chemical potential, axial length, axial density profile, and local sound
velocity. These analytical expressions remain valid and accurate in between the
above two extreme regimes. Following the same procedure we also derive an
effective 2D equation that governs the transverse dynamics of mean-field
disk-shaped condensates. This equation, which also has the correct limit in
both the quasi-2D and the Thomas-Fermi regime, is again more simple and
accurate than previous proposals. We have checked the validity of our equations
by numerically solving the full 3D Gross-Pitaevskii equation.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 05:16:43 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 19:05:25 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Mateo",
"A. Muñoz",
"",
"Univ. de La Laguna"
],
[
"Delgado",
"V.",
"",
"Univ. de La Laguna"
]
] |
0707.2436 | Massimiliano Laddomada Ph.D. | Massimiliano Laddomada | On the Polyphase Decomposition for Design of Generalized Comb Decimation
Filters | Submitted to IEEE TCAS-I, February 2007; 11 double-column pages, 9
figures, 1 table | null | 10.1109/TCSI.2008.920136 | null | cs.OH | null | Generalized comb filters (GCFs) are efficient anti-aliasing decimation
filters with improved selectivity and quantization noise (QN) rejection
performance around the so called folding bands with respect to classical comb
filters.
In this paper, we address the design of GCF filters by proposing an efficient
partial polyphase architecture with the aim to reduce the data rate as much as
possible after the Sigma-Delta A/D conversion. We propose a mathematical
framework in order to completely characterize the dependence of the frequency
response of GCFs on the quantization of the multipliers embedded in the
proposed filter architecture. This analysis paves the way to the design of
multiplier-less decimation architectures.
We also derive the impulse response of a sample 3rd order GCF filter used as
a reference scheme throughout the paper.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 05:38:30 GMT"
}
] | 2016-11-18T00:00:00 | [
[
"Laddomada",
"Massimiliano",
""
]
] |
0707.2437 | James Buick | J. M. Buick and J. A. Cosgrove | Investigation of a lattice Boltzmann model with a variable speed of
sound | null | Journal of Physics A: Mathematical and General, 39, 13807-13815,
2006 | 10.1088/0305-4470/39/44/013 | null | physics.flu-dyn physics.comp-ph | null | A lattice Boltzmann model is considered in which the speed of sound can be
varied independently of the other parameters. The range over which the speed of
sound can be varied is investigated and good agreement is found between
simulations and theory. The onset of nonlinear effects due to variations in the
speed of sound is also investigated and good agreement is again found with
theory. It is also shown that the fluid viscosity is not altered by changing
the speed of sound.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 06:03:57 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Buick",
"J. M.",
""
],
[
"Cosgrove",
"J. A.",
""
]
] |
0707.2438 | Carlos Pascual-Izarra | C. Pascual-Izarra, N. P. Barradas, M. A. Reis | LibCPIXE: a PIXE simulation open-source library for multilayered samples | null | Nuclear Instruments and Methods in Physics Research Section B 249,
820-822 (2006) | 10.1016/j.nimb.2006.03.147 | null | cond-mat.mtrl-sci | null | Most particle induced X-ray emission (PIXE) data analysis codes are not
focused on handling multilayered samples. We have developed an open-source
library called "LibCPIXE", for PIXE data analysis. It is written in standard C
and implements functions for simulating X-ray yields of PIXE spectra taken from
arbitrary samples, including multilayered targets. The library is designed to
be fast, portable, modular and scalable, as well as to facilitate its
incorporation into any existing program. In order to demonstrate the
capabilities of the library, a program called CPIXE was developed and used to
analyze various real samples involving both bulk and layered samples. Just as
the library, the CPIXE source code is freely available under the General Public
License. We demonstrate that it runs both under GNU/Linux systems as well as
under MS Windows. There is in principle no limitation to port it to other
platforms.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 06:19:54 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Pascual-Izarra",
"C.",
""
],
[
"Barradas",
"N. P.",
""
],
[
"Reis",
"M. A.",
""
]
] |
0707.2439 | Desmond FitzGerald | David Easdown, James East, and D.G.FitzGerald | A Presentation for the Dual Symmetric Inverse Monoid | 21 pp., 6 figures, 2 tables, 7 refs | Internat.J.Algebra Comput. 18 (2008) 357-374 | null | null | math.GR | null | The dual symmetric inverse monoid $\mathscr{I}_n^*$ is the inverse monoid of
all isomorphisms between quotients of an $n$-set. We give a monoid presentation
of $\mathscr{I}_n^*$ and, along the way, establish criteria for a monoid to be
inverse when it is generated by completely regular elements.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 06:24:23 GMT"
}
] | 2015-07-21T00:00:00 | [
[
"Easdown",
"David",
""
],
[
"East",
"James",
""
],
[
"FitzGerald",
"D. G.",
""
]
] |
0707.2440 | Herbert Lange | D. Avritzer, H. Lange | Moduli spaces of quadratic complexes and their singular surfaces | 22 pages | null | null | null | math.AG | null | We construct the coarse moduli space $\cM_{qc}(\sigma)$ of quadratic line
complexes with a fixed Segre symbol $\sigma$ as well as the moduli space
$\cM_{ss}(\sigma)$ of the corresponding singular surfaces. We show that the map
associating to a quadratic line complex its singular surface induces a morphism
$\pi: \cM_{qc}(\sigma) \ra \cM_{ss}(\sigma)$. Finally we deduce that the
varieties of cosingular quadratic line complexes are almost always curves.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 06:25:37 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Avritzer",
"D.",
""
],
[
"Lange",
"H.",
""
]
] |
0707.2441 | Herbert Lange | H. Lange, A. Rojas | A Galois-theoretic approach to Kanev's correspondence | 15 pages | null | null | null | math.AG | null | Let $G$ be a finite group, $\Lambda$ an absolutely irreducible $\Z[G]$-module
and $w$ a weight of $\Lambda$.
To any Galois covering with group $G$ we associate two correspondences, the
Schur and the Kanev correspondence.
We work out their relation and compute their invariants.
Using this, we give some new examples of Prym-Tyurin varieties.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 06:32:37 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Lange",
"H.",
""
],
[
"Rojas",
"A.",
""
]
] |
0707.2442 | Tianping Chen | Wei Wu and Tianping Chen | Desynchronization of pulse-coupled oscillators with delayed excitatory
coupling | null | Nonlinearity 20(2006) 789-808 | 10.1088/0951-7715/20/3/011 | null | math.DS | null | Collective behavior of pulse-coupled oscillators has been investigated
widely. As an example of pulse-coupled networks, fireflies display many kinds
of flashing patterns. Mirollo and Strogatz (1990) proposed a pulse-coupled
oscillator model to explain the synchronization of South East Asian fireflies
({\itshape Pteroptyx malaccae}). However, transmission delays were not
considered in their model. In fact, the presence of transmission delays can
lead to desychronization. In this paper, pulse-coupled oscillator networks with
delayed excitatory coupling are studied. Our main result is that under
reasonable assumptions, pulse-coupled oscillator networks with delayed
excitatory coupling can not achieve complete synchronization, which can explain
why another species of fireflies ({\itshape Photinus pyralis}) rarely
synchronizes flashing. Finally, two numerical simulations are given. In the
first simulation, we illustrate that even if all the initial phases are very
close to each other, there could still be big variations in the times to
process the pulses in the pipeline. It implies that asymptotical
synchronization typically also cannot be achieved. In the second simulation, we
exhibit a phenomenon of clustering synchronization.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 06:50:33 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Wu",
"Wei",
""
],
[
"Chen",
"Tianping",
""
]
] |
0707.2443 | Lagache | G. Lagache (IAS), N. Bavouzet (IAS), N. Fernandez-Conde (IAS), N.
Ponthieu (IAS), T. Rodet (L2S), H. Dole (IAS), M.-A. Miville-Deschenes (IAS),
J.-L. Puget (IAS) | Correlated Anisotropies in the Cosmic Far-Infrared Background Detected
by MIPS/Spitzer: Constraint on the Bias | ApJ Letters, in press | null | 10.1086/521301 | null | astro-ph | null | We report the detection of correlated anisotropies in the Cosmic Far-Infrared
Background at 160 microns. We measure the power spectrum in the Spitzer/SWIRE
Lockman Hole field. It reveals unambiguously a strong excess above cirrus and
Poisson contributions, at spatial scales between 5 and 30 arcminutes,
interpreted as the signature of infrared galaxy clustering. Using our model of
infrared galaxy evolution we derive a linear bias b=1.74 \pm 0.16. It is a
factor 2 higher than the bias measured for the local IRAS galaxies. Our model
indicates that galaxies dominating the 160 microns correlated anisotropies are
at z~1. This implies that infrared galaxies at high redshifts are biased
tracers of mass, unlike in the local Universe.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 07:13:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lagache",
"G.",
"",
"IAS"
],
[
"Bavouzet",
"N.",
"",
"IAS"
],
[
"Fernandez-Conde",
"N.",
"",
"IAS"
],
[
"Ponthieu",
"N.",
"",
"IAS"
],
[
"Rodet",
"T.",
"",
"L2S"
],
[
"Dole",
"H.",
"",
"IAS"
],
[
"Miville-Deschenes",
"M. -A.",
"",
"IAS"
],
[
"Puget",
"J. -L.",
"",
"IAS"
]
] |
0707.2444 | Hiroki Sumi | Hiroki Sumi and Mariusz Urbanski | The equilibrium states for semigroups of rational maps | 23 pages | Monatsh. Math., 156 (2009), no. 4, 371--390 | null | null | math.DS math.CV math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the dynamics of skew product maps associated with finitely
generated semigroups of rational maps on the Riemann sphere. We show that under
some conditions on the dynamics and the potential function \psi, there exists a
unique equilibrium state for \psi and a unique $\exp(\P(\psi)-\psi)$-conformal
measure, where P(\psi) denotes the topological pressure of \psi.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 06:56:08 GMT"
},
{
"version": "v2",
"created": "Wed, 18 Jul 2007 12:32:52 GMT"
},
{
"version": "v3",
"created": "Fri, 22 Feb 2008 06:51:22 GMT"
},
{
"version": "v4",
"created": "Sat, 23 Feb 2008 04:07:32 GMT"
},
{
"version": "v5",
"created": "Fri, 21 Mar 2008 05:42:13 GMT"
},
{
"version": "v6",
"created": "Fri, 1 Aug 2008 06:01:30 GMT"
},
{
"version": "v7",
"created": "Tue, 19 Aug 2008 01:56:04 GMT"
},
{
"version": "v8",
"created": "Fri, 26 Jun 2009 10:52:53 GMT"
}
] | 2009-06-26T00:00:00 | [
[
"Sumi",
"Hiroki",
""
],
[
"Urbanski",
"Mariusz",
""
]
] |
0707.2445 | Christof Sparber | Anton Arnold, Irene M. Gamba, Maria Pia Gualdani, Christof Sparber | The Wigner-Fokker-Planck equation: Stationary states and large time
behavior | This paper has been withdrawn by the authors due to a crucial error
in the proof of the main result. In a new manuscript (with two new authors)
available at arXiv:1010.2791v1 this problem has been resolved | null | null | null | quant-ph cond-mat.stat-mech math-ph math.AP math.MP | null | This paper has been withdrawn by the authors due to a crucial error in the
proof of the main result. In a new manuscript (with two new authors) available
at arXiv:1010.2791v1 this problem has been resolved.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 07:13:00 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Oct 2010 16:19:07 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Oct 2010 03:37:34 GMT"
}
] | 2010-10-18T00:00:00 | [
[
"Arnold",
"Anton",
""
],
[
"Gamba",
"Irene M.",
""
],
[
"Gualdani",
"Maria Pia",
""
],
[
"Sparber",
"Christof",
""
]
] |
0707.2446 | Arunava Goswami | Dipankar Seth, Nitai Debnath, Ayesha Rahman, Sunit Mukhopadhyaya, Inga
Mewis, Christian Ulrichs, R. L. Bramhachary and Arunava Goswami | Control of poultry chicken malaria by surface functionalized amorphous
nanosilica | 10 pages, 3 figures, 1 table | null | null | null | q-bio.BM q-bio.MN | null | Surface modified amorphous nanoporous silica molecules with hydrophobic as
well as hydrophilic character can be effectively used as therapeutic drug for
combating chicken malaria in poultry industry. The amorphous nanosilica was
developed by top-down approach using volcanic soil derived silica as source
material. Amorphous silica has long been used as feed additive for poultry
industry and considered to be safe for human consumption by WHO and USDA. The
basic mechanism of action of these nanosilica molecules is mediated by the
physical absorption of VLDL, serum triglycerides and other serum cholesterol
components in the lipophilic nanopores of nanosilica. This reduces the supply
of the host derived cholesterol, thus limiting the growth of the malarial
parasite in vivo.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 07:22:07 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Seth",
"Dipankar",
""
],
[
"Debnath",
"Nitai",
""
],
[
"Rahman",
"Ayesha",
""
],
[
"Mukhopadhyaya",
"Sunit",
""
],
[
"Mewis",
"Inga",
""
],
[
"Ulrichs",
"Christian",
""
],
[
"Bramhachary",
"R. L.",
""
],
[
"Goswami",
"Arunava",
""
]
] |
0707.2447 | Hiroki Sumi | Hiroki Sumi and Mariusz Urbanski | Real analyticity of Hausdorff dimension for expanding rational
semigroups | 33 pages, 2 figures. Some typos are fixed. Published in Ergodic
Theory Dynam. Systems (2010), Vol. 30, No. 2, 601-633. | Ergodic Theory Dynam. Systems (2010), Vol. 30, No. 2, 601-633. | null | null | math.DS math.CV math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the dynamics of expanding semigroups generated by finitely many
rational maps on the Riemann sphere. We show that for an analytic family of
such semigroups, the Bowen parameter function is real-analytic and
plurisubharmonic. Combining this with a result obtained by the first author, we
show that if for each semigroup of such an analytic family of expanding
semigroups satisfies the open set condition, then the function of the Hausdorff
dimension of the Julia set is real-analytic and plurisubharmonic. Moreover, we
provide an extensive collection of classes of examples of analytic families of
semigroups satisfying all the above conditions and we analyze in detail the
corresponding Bowen's parameters and Hausdorff dimension function.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 07:29:08 GMT"
},
{
"version": "v2",
"created": "Wed, 18 Jul 2007 12:40:04 GMT"
},
{
"version": "v3",
"created": "Thu, 22 May 2008 04:03:55 GMT"
},
{
"version": "v4",
"created": "Thu, 10 Jul 2008 07:02:11 GMT"
},
{
"version": "v5",
"created": "Thu, 5 Feb 2009 01:45:24 GMT"
},
{
"version": "v6",
"created": "Mon, 20 Apr 2009 07:33:36 GMT"
},
{
"version": "v7",
"created": "Wed, 10 Mar 2010 04:31:42 GMT"
}
] | 2010-03-11T00:00:00 | [
[
"Sumi",
"Hiroki",
""
],
[
"Urbanski",
"Mariusz",
""
]
] |
0707.2448 | Carlos Pascual-Izarra | C. Pascual-Izarra (1), N. P. Barradas (2), M. A. Reis (2), C. Jeynes
(3), M. Menu (4), B. Lavedrine (5), J. J. Ezrati (4), S. R\"ohrs (4) ((1)
IEM-CSIC, Madrid, Spain, (2) ITN, Sacav\'em, Portugal, (3) University of
Surrey, Guildford, United Kingdom, (4) CNRS, Paris, France, (5) Mus\'eum
national d'histoire naturelle, Paris, France) | Towards truly simultaneous PIXE and RBS analysis of layered objects in
cultural heritage | 9 pages, 3 figures | Nuclear Instruments and Methods in Physics Research B 261 (2007)
426-429 | 10.1016/j.nimb.2007.04.259 | null | cond-mat.mtrl-sci | null | For a long time, RBS and PIXE techniques have been used in the field of
cultural heritage. Although the complementarity of both techniques has long
been acknowledged, its full potential has not been yet developed due to the
lack of general purpose software tools for analysing the data from both
techniques in a coherent way. In this work we provide an example of how the
recent addition of PIXE to the set of techniques supported by the DataFurnace
code can significantly change this situation. We present a case in which a non
homogeneous sample (an oxidized metal from a photographic plate -heliography-
made by Niepce in 1827) is analysed using RBS and PIXE in a straightforward and
powerful way that can only be performed with a code that treats both techniques
simultaneously as a part of one single and coherent analysis. The optimization
capabilities of DataFurnace, allowed us to obtain the composition profiles for
these samples in a very simple way.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 07:30:38 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Pascual-Izarra",
"C.",
""
],
[
"Barradas",
"N. P.",
""
],
[
"Reis",
"M. A.",
""
],
[
"Jeynes",
"C.",
""
],
[
"Menu",
"M.",
""
],
[
"Lavedrine",
"B.",
""
],
[
"Ezrati",
"J. J.",
""
],
[
"Röhrs",
"S.",
""
]
] |
0707.2449 | Shailesh Kulkarni | Rabin Banerjee and Shailesh Kulkarni | Hawking Radiation and Covariant Anomalies | Minor changes, conforms to published version | Phys.Rev.D77:024018,2008 | 10.1103/PhysRevD.77.024018 | null | hep-th gr-qc | null | Generalising the method of Wilczek and collaborators we provide a derivation
of Hawking radiation from charged black holes using only covariant gauge and
gravitational anomalies. The reliability and universality of the anomaly
cancellation approach to Hawking radiation is also discussed.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 07:47:56 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Dec 2007 14:50:00 GMT"
},
{
"version": "v3",
"created": "Fri, 18 Jan 2008 11:10:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Banerjee",
"Rabin",
""
],
[
"Kulkarni",
"Shailesh",
""
]
] |
0707.2450 | Kristof Petrovay | K. Petrovay | "Black Star" or Astrophysical Black Hole? | Poster presented at "Compact Objects" meeting in Hunagshan, China,
2-7 July 2007. To be published in the AIP Conference Proceeding series | AIP Conf.Proc.968:426-428,2008 | 10.1063/1.2840449 | null | astro-ph | null | Recently wide publicity has been given to a claim by T. Vachaspati that
"black holes do not exist", that the objects known as black holes in
astrophysics should rather be called "black stars" and they not only do not
have event horizons but actually can be the source of spectacular gamma ray
bursts. In this short essay (no flimsier than the original preprint where these
extravagant claims appeared) I demonstrate that these ill-considered claims are
clearly wrong. Yet they present a good occasion to reflect on some well known
but little discussed conceptual difficulties which arise when applying
relativistic terminology in an astrophysical context.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 07:53:03 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Petrovay",
"K.",
""
]
] |
0707.2451 | Yu Nakayama | Yu Nakayama | SUSY Unparticle and Conformal Sequestering | 12 pages, v2: small comment added on conformal invariance vs scale
invariance | Phys.Rev.D76:105009,2007 | 10.1103/PhysRevD.76.105009 | UT-KOMABA/07-11 | hep-ph hep-th | null | We investigate unparticle physics with supersymmetry (SUSY). The SUSY
breaking effects due to the gravity mediation induce soft masses for the SUSY
unparticles and hence break the conformal invariance. The unparticle physics
observable in near future experiments is only consistent if the SUSY breaking
effects from the hidden sector to the standard model sector are dominated by
the gauge mediation, or if the SUSY breaking effects to the unparticle sector
is sufficiently sequestered. We argue that the natural realization of the
latter possibility is the conformal sequestering scenario.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 08:08:06 GMT"
},
{
"version": "v2",
"created": "Wed, 18 Jul 2007 13:08:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nakayama",
"Yu",
""
]
] |
0707.2452 | Stefano Forte | Riccardo Abbate, Stefano Forte and Giovanni Ridolfi | A new prescription for soft gluon resummation | 15 pages, 3 figures. Final version, to be published in Phys. Lett. B.
Several typos corrected (in particular eqs 26,41,53); fig. 3 added | Phys.Lett.B657:55-63,2007 | 10.1016/j.physletb.2007.09.060 | IFUM-897-FT, GeF/TH/17-07 | hep-ph | null | We present a new prescription for the resummation of the divergent series of
perturbative corrections, due to soft gluon emission, to hard processes near
threshold in perturbative QCD (threshold resummation). This prescription is
based on Borel resummation, and contrary to the commonly used minimal
prescription, it does not introduce a dependence of resummed physical
observables on the kinematically unaccessible x->0 region of parton
distributions. We compare results for resummed deep-inelastic scattering
obtained using the Borel prescription and the minimal prescription and exploit
the comparison to discuss the ambiguities related to the resummation procedure.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 08:09:54 GMT"
},
{
"version": "v2",
"created": "Fri, 2 Nov 2007 17:45:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Abbate",
"Riccardo",
""
],
[
"Forte",
"Stefano",
""
],
[
"Ridolfi",
"Giovanni",
""
]
] |
0707.2453 | Hendrik Bartko | The MAGIC Collaboration: J. Albert, et al | Unfolding of differential energy spectra in the MAGIC experiment | Submitted to NIM A | Nucl.Instrum.Meth.A583:494-506,2007 | 10.1016/j.nima.2007.09.048 | MPP-2007-95 | astro-ph | null | The paper describes the different methods, used in the MAGIC experiment, to
unfold experimental energy distributions of cosmic ray particles (gamma-rays).
Questions and problems related to the unfolding are discussed. Various
procedures are proposed which can help to make the unfolding robust and
reliable. The different methods and procedures are implemented in the MAGIC
software and are used in most of the analyses.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 08:10:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"The MAGIC Collaboration",
"",
""
],
[
"Albert",
"J.",
""
]
] |
0707.2454 | Donatella Iacono | Donatella Iacono | A semiregularity map annihilating obstructions to deforming holomorphic
maps | 14 pages, minor changes, revised introduction; scheduled to appear in
Canadian Math. Bull. Issue 54/3 (September, 2011) | Canadian Mathematical Bulletin 54, n 3, 2011, 472-486 | null | null | math.AG math.QA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study deformations of holomorphic maps of compact, complex, K\"ahler
manifolds. In particular, we describe a generalization of Bloch's
semiregularity map that annihilates obstructions to deform holomorphic maps
with fixed codomain.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 08:14:04 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jun 2010 13:42:32 GMT"
}
] | 2011-12-09T00:00:00 | [
[
"Iacono",
"Donatella",
""
]
] |
0707.2455 | Alberto Salvio | A. Salvio, M. Shaposhnikov | Chiral Asymmetry from a 5D Higgs Mechanism | 30 pages, 5 figures, uses axodraw.sty. Extended version, matches the
article published on JHEP | JHEP 0711:037,2007 | 10.1088/1126-6708/2007/11/037 | null | hep-th hep-ph | null | An intriguing feature of the Standard Model is that the representations of
the unbroken gauge symmetries are vector-like whereas those of the
spontaneously broken gauge symmetries are chiral. Here we provide a toy model
which shows that a natural explanation of this property could emerge in higher
dimensional field theories and discuss the difficulties that arise in the
attempt to construct a realistic theory. An interesting aspect of this type of
models is that the 4D low energy effective theory is not generically gauge
invariant. However, the non-invariant contributions to the observable
quantities are very small, of the order of the square of the ratio between the
light particle mass scale and the Kaluza-Klein mass scale. Remarkably, when we
take the unbroken limit both the chiral asymmetry and the non-invariant terms
disappear.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 09:53:56 GMT"
},
{
"version": "v2",
"created": "Mon, 12 Nov 2007 14:00:30 GMT"
}
] | 2009-04-30T00:00:00 | [
[
"Salvio",
"A.",
""
],
[
"Shaposhnikov",
"M.",
""
]
] |
0707.2456 | Kirone Mallick | Sebastien Aumaitre, Kirone Mallick, Francois Petrelis | Effects of the low frequencies of noise on On-Off intermittency | 13pages, 13 figures | J. Stat. Phys. 123, p909 (2006) | 10.1007/s10955-006-9116-9 | null | cond-mat.stat-mech nlin.CD | null | A bifurcating system subject to multiplicative noise can exhibit on-off
intermittency close to the instability threshold. For a canonical system, we
discuss the dependence of this intermittency on the Power Spectrum Density
(PSD) of the noise. Our study is based on the calculation of the Probability
Density Function (PDF) of the unstable variable. We derive analytical results
for some particular types of noises and interpret them in the framework of
on-off intermittency. Besides, we perform a cumulant expansion for a random
noise with arbitrary power spectrum density and show that the intermittent
regime is controlled by the ratio between the departure from the threshold and
the value of the PSD of the noise at zero frequency. Our results are in
agreement with numerical simulations performed with two types of random
perturbations: colored Gaussian noise and deterministic fluctuations of a
chaotic variable. Extensions of this study to another, more complex, system are
presented and the underlying mechanisms are discussed.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 08:21:25 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Aumaitre",
"Sebastien",
""
],
[
"Mallick",
"Kirone",
""
],
[
"Petrelis",
"Francois",
""
]
] |
0707.2457 | Eteri Gelagutashvili | Vasil G. Bregadze, Eteri S. Gelagutashvili, Ketevan J. Tsakadze | Glow Discharge AES: Methodological Peculiarities of Pulse Element
Analysis and Flash Desorption | 12 pages, 0 figures | null | null | null | physics.bio-ph | null | Different techniques of Glow Discharge AES are described in this paper. The
most important parameters at such investigations are: the power of VHF-field,
pressure of the inert gas and concentration of the easily ionizable additive,
e.g. NaCl. The influences of these parameters were studied It is proposed a
high sensitive flash desorption method, which enables investigation of the
water desorption rate from humidified samples of biological origin, namely DNA
and chromatin. The ways of minimizing of detection limit are considered as the
most important characteristics of an analytical device. The concentration of
any measured element is detectable if it correlates to the signal equal to
tripled standard deviation of the results of background measurement. Electron
temperature of the Helium has been evaluated by absorption rate at two lines of
helium \lambda=353.828nm; \lambda'=344.759nm that was equal to T_c ~ 15000 K.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 08:32:18 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Bregadze",
"Vasil G.",
""
],
[
"Gelagutashvili",
"Eteri S.",
""
],
[
"Tsakadze",
"Ketevan J.",
""
]
] |
0707.2458 | Mikko Laine | M. Laine, O. Philipsen, M. Tassler | Thermal imaginary part of a real-time static potential from classical
lattice gauge theory simulations | 18 pages. v2: clarifications and a reference added; published version | JHEP0709:066,2007 | 10.1088/1126-6708/2007/09/066 | null | hep-lat hep-ph | null | Recently, a finite-temperature real-time static potential has been introduced
via a Schr\"odinger-type equation satisfied by a certain heavy quarkonium
Green's function. Furthermore, it has been pointed out that it possesses an
imaginary part, which induces a finite width for the tip of the quarkonium peak
in the thermal dilepton production rate. The imaginary part originates from
Landau-damping of low-frequency gauge fields, which are essentially classical
due to their high occupation number. Here we show how the imaginary part can be
measured with classical lattice gauge theory simulations, accounting
non-perturbatively for the infrared sector of finite-temperature field theory.
We demonstrate that a non-vanishing imaginary part indeed exists
non-perturbatively; and that its value agrees semi-quantitatively with that
predicted by Hard Loop resummed perturbation theory.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 09:25:46 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Sep 2007 07:12:06 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Laine",
"M.",
""
],
[
"Philipsen",
"O.",
""
],
[
"Tassler",
"M.",
""
]
] |
0707.2459 | Riccardo Scarpa | Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi, and Giovanni
Carraro | Using globular clusters to test gravity in the weak acceleration regime | As published on the European Southern Observatory "the Messenger",
Num. 128, June 2007. Seven pages, 4 figures, 2 tables | ESO Messenger 128:41,2007 | null | null | astro-ph | null | We report on the results from an ongoing program aimed at testing Newton's
law of gravity in the low acceleration regime using globular clusters. It is
shown that all clusters studied so far do behave like galaxies, that is, their
velocity dispersion profile flattens out at large radii where the acceleration
of gravity goes below 1e-8 cm/s/s, instead of following the expected Keplerian
fall off. In galaxies this behavior is ascribed to the existence of a dark
matter halo. Globular clusters, however, do not contain dark matter, hence this
result might indicate that our present understanding of gravity in the weak
regime of accelerations is incomplete and somehow incorrect.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 08:49:22 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Scarpa",
"Riccardo",
""
],
[
"Marconi",
"Gianni",
""
],
[
"Gilmozzi",
"Roberto",
""
],
[
"Carraro",
"Giovanni",
""
]
] |
0707.2460 | F. S. Bergeret | J. C. Cuevas, F. S. Bergeret | Magnetic Interference Patterns and Vortices in Diffusive SNS junctions | 6 pages, 3 figures | Phys. Rev. Lett. 99, 217002 (2007) | 10.1103/PhysRevLett.99.217002 | null | cond-mat.supr-con cond-mat.mes-hall | null | We study theoretically the electronic and transport properties of a diffusive
superconductor-normal metal-superconductor (SNS) junction in the presence of a
perpendicular magnetic field. We show that the field dependence of the critical
current crosses over from the well-known Fraunhofer pattern in wide junctions
to a monotonous decay when the width of the normal wire is smaller than the
magnetic length \xi_H = \sqrt{\Phi_0/H}, where H is the magnetic field and
\Phi_0 the flux quantum. We demonstrate that this behavior is a direct
consequence of the magnetic vortex structure appearing in the normal region and
predict how such structure is manifested in the local density of states.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 08:50:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cuevas",
"J. C.",
""
],
[
"Bergeret",
"F. S.",
""
]
] |
0707.2461 | Burra Sidharth Gautam | Burra G. Sidharth | Bosons, Fermions and Branes | 10 pages, latex | null | null | IIAMIS TR 070701 | physics.gen-ph | null | Starting from considerations of Bosons at the real life Compton scale we go
on to a description of Fermions, specifically the Dirac equation in terms of an
underlying noncommutative geometry described by the Dirac $\gamma$ matrices and
generalize this to branes in an underlying C-space (with Clifford Algebra).
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 08:52:32 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Sidharth",
"Burra G.",
""
]
] |
0707.2462 | Pablo Goldenzweig Mr | K. Abe, et al | Search for B Meson Decays to omega K*0 | 6 pages, 3 figures (6 figure files) | null | null | BELLE-CONF-0750, UCHEP-07-05 | hep-ex | null | We report a search for the charmless vector-vector decay B0->omega K*0 with
520x10^6 BBbar pairs collected with the Belle detector at the KEKB e+e-
collider. We measure the branching fraction in units of 10^-6: Br = 1.2
+0.9-0.8 +-0.2 (<2.7), where the first error is statistical, the second
systematic, and the upper limit is at the 90% confidence level.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 09:14:42 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Abe",
"K.",
""
]
] |
0707.2463 | Satoshi Shirai | K. Hamaguchi, S. Shirai and T. T. Yanagida | Composite Messenger Baryon as a Cold Dark Matter | 7 pages, 1 figure | Phys.Lett.B654:110-112,2007 | 10.1016/j.physletb.2007.08.047 | UT-07-22 | hep-ph | null | Among various supersymmetric (SUSY) models, gauge-mediated SUSY breaking
models with an ultra-light gravitino of mass m_{3/2} \lesssim O(10) eV are very
attractive, since they are completely free from notorious gravitino problems. A
drawback of such a scenario is the absence of the supersymmetric cold dark
matter. In this letter, we propose that a baryonic bound state of strongly
interacting messenger particles, with a mass of O(100) TeV, can naturally be
the cold dark matter. We also exemplify a model which realizes such a scenario.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 08:56:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hamaguchi",
"K.",
""
],
[
"Shirai",
"S.",
""
],
[
"Yanagida",
"T. T.",
""
]
] |
0707.2464 | Helmut Rathgen | Helmut Rathgen, Kazuyasu Sugiyama, Claus-Dieter Ohl, Detlef Lohse and
Frieder Mugele | Nanometer-Resolved Collective Micromeniscus Oscillations through Optical
Diffraction | 4 pages, 5 figures | Phys. Rev. Lett. 99, 214501 (2007) | 10.1103/PhysRevLett.99.214501 | null | cond-mat.soft | null | We study the dynamics of periodic arrays of micrometer-sized liquid-gas
menisci formed at superhydrophobic surfaces immersed into water. By measuring
the intensity of optical diffraction peaks in real time we are able to resolve
nanometer scale oscillations of the menisci with sub-microsecond time
resolution. Upon driving the system with an ultrasound field at variable
frequency we observe a pronounced resonance at a few hundred kHz, depending on
the exact geometry. Modeling the system using the unsteady Stokes equation, we
find that this low resonance frequency is caused by a collective mode of the
acoustically coupled oscillating menisci.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 09:00:18 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Dec 2007 15:18:41 GMT"
}
] | 2007-12-04T00:00:00 | [
[
"Rathgen",
"Helmut",
""
],
[
"Sugiyama",
"Kazuyasu",
""
],
[
"Ohl",
"Claus-Dieter",
""
],
[
"Lohse",
"Detlef",
""
],
[
"Mugele",
"Frieder",
""
]
] |
0707.2465 | Enrico Piconcelli | E. Piconcelli, F. Fiore, F. Nicastro, S. Mathur, M. Brusa, A.
Comastri, S. Puccetti | The XMM-Newton view of IRAS 09104+4109: evidence for a changing-look
Type 2 quasar? | Accepted by Astronomy and Astrophysics | null | 10.1051/0004-6361:20077630 | null | astro-ph | null | We analyzed the spectroscopic data from the PN and the MOS cameras in the
0.4-10 keV band. We also used an archival BeppoSAX 1-50 keV observation of IRAS
09104+4109 to investigate possible variations of the quasar emission. The X-ray
emission in the EPIC band is dominated by the intra-cluster medium thermal
emission. We found that the quasar contributes ~35% of the total flux in the
2-10 keV band. Both a transmission- (through a Compton-thin absorber with a
Compton optical depth of \tau_C~0.3, i.e. Nh~5 x 10^{23} cm^-2) and a
reflection-dominated (\tau_C>1) model provide an excellent fit to the quasar
continuum emission. However, the value measured for the EW of Fe Kalpha
emission line is only marginally consistent with the presence of a
Compton-thick absorber in a reflection-dominated scenario, which had been
suggested by a previous, marginal (i.e. 2.5\sigma) detection with the hard
X-ray (15-50 keV), non-imaging BeppoSAX/PDS instrument. Moreover, the value of
luminosity in the 2-10 keV band measured by the transmission-dominated model is
fully consistent with that expected on the basis of the bolometric luminosity
of IRAS 09104+4109. From the analysis of the XMM-Newton data we therefore
suggest the possibility that the absorber along the line of sight to the
nucleus of IRAS 09104+4109 is Compton-thin. Alternatively, the absorber column
density could have changed from Compton-thick to -thin in the five years
elapsed between the observations. If this is the case, then IRAS 09104+4109 is
the first 'changing-look' quasar ever detected.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 09:08:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Piconcelli",
"E.",
""
],
[
"Fiore",
"F.",
""
],
[
"Nicastro",
"F.",
""
],
[
"Mathur",
"S.",
""
],
[
"Brusa",
"M.",
""
],
[
"Comastri",
"A.",
""
],
[
"Puccetti",
"S.",
""
]
] |
0707.2466 | Pierre Jop | Pierre Jop (IUSTI), Yo\"el Forterre (IUSTI), Olivier Pouliquen (IUSTI) | Initiation of granular surface flows in a narrow channel | 5 pages, 5 figures, to be published in Physics of Fluids | Physics of Fluids 19 (2007) 088102 | 10.1063/1.2753111 | null | cond-mat.soft | null | We experimentally investigate how a long granular pile confined in a narrow
channel destabilizes when it is inclined above the angle of repose. A uniform
flow then develops, which is localized at the free surface. It first
accelerates before reaching a steady uniform regime. During this process, an
apparent erosion is observed and the thickness of the flowing layer increases.
We precisely study the evolution of the vertical velocity profile in this
transient regime. The measurements are compared with the prediction of a
visco-plastic model [P. Jop, Y. Forterre and O. Pouliquen, Nature 441, 727
(2006)]
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 09:10:41 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Jop",
"Pierre",
"",
"IUSTI"
],
[
"Forterre",
"Yoël",
"",
"IUSTI"
],
[
"Pouliquen",
"Olivier",
"",
"IUSTI"
]
] |
0707.2467 | Patrick Erik Bradley | Patrick Erik Bradley | Cyclic coverings of the $p$-adic projective line by Mumford curves | 17 pages, 3 eps-figures. To appear in manuscripta mathematica | manuscripta math. 124, 77-95 (2007) | 10.1007/s00229-007-0120-4 | null | math.AG | null | Exact bounds for the positions of the branch points for cyclic coverings of
the $p$-adic projective line by Mumford curves are calculated in two ways.
Firstly, by using Fumiharu Kato's *-trees, and secondly by giving explicit
matrix representations of the Schottky groups corresponding to the Mumford
curves above the projective line through combinatorial group theory.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 09:10:55 GMT"
}
] | 2007-08-29T00:00:00 | [
[
"Bradley",
"Patrick Erik",
""
]
] |
0707.2468 | Bojan Arbutina | Bojan Arbutina | Radial Dependence of Extinction in Parent Galaxies of Supernovae | 4 pages, 1 table, 2 figures, 6th SCSLSA Proc | AIP Conf.Proc.938:202-205,2007 | 10.1063/1.2800129 | null | astro-ph | null | The problem of extinction is the most important issue to be dealt with in the
process of obtaining true absolute magnitudes of core-collapse supernovae
(SNe). The plane-parallel model which gives absorption dependent on galaxy
inclination, widely used in the past, was shown not to describe extinction
adequately. We try to apply an alternative model which introduces radial
ependence of extinction. A certain trend of dimmer SNe with decreasing radius
from the center of a galaxy was found, for a chosen sample of stripped-envelope
SNe.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 11:51:14 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Arbutina",
"Bojan",
""
]
] |
0707.2469 | Juan M. Lopez | Rafael Gallego (Univ de Oviedo), Mario Castro (Universidad Pontificia
Comillas), and Juan M. L\'opez (Instituto de Fisica de Cantabria) | Pseudospectral versus finite-differences schemes in the numerical
integration of stochastic models of surface growth | 13 single column pages, RevTeX, 6 eps figs | null | 10.1103/PhysRevE.76.051121 | null | cond-mat.stat-mech | null | We present a comparison between finite differences schemes and a
pseudospectral method applied to the numerical integration of stochastic
partial differential equations that model surface growth. We have studied, in
1+1 dimensions, the Kardar, Parisi and Zhang model (KPZ) and the Lai, Das Sarma
and Villain model (LDV). The pseudospectral method appears to be the most
stable for a given time step for both models. This means that the time up to
which we can follow the temporal evolution of a given system is larger for the
pseudospectral method. Moreover, for the KPZ model, a pseudospectral scheme
gives results closer to the predictions of the continuum model than those
obtained through finite difference methods. On the other hand, some numerical
instabilities appearing with finite difference methods for the LDV model are
absent when a pseudospectral integration is performed. These numerical
instabilities give rise to an approximate multiscaling observed in the
numerical simulations. With the pseudospectral approach no multiscaling is seen
in agreement with the continuum model.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 09:24:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gallego",
"Rafael",
"",
"Univ de Oviedo"
],
[
"Castro",
"Mario",
"",
"Universidad Pontificia\n Comillas"
],
[
"López",
"Juan M.",
"",
"Instituto de Fisica de Cantabria"
]
] |
0707.2470 | Manolis Plionis Dr. | N. Espino-Briones, M. Plionis, C. Ragone-Figueroa | Environmental Effects of Dark Matter Haloes: The Clustering-Substructure
relation of Group-size Haloes | ApJ. Letters (accepted) | null | 10.1086/521622 | null | astro-ph | null | We estimate the two-point correlation function of dark matter haloes, with
masses >10^{13} h^{-1} Mo, that have or not significant substructure. The
haloes are identified with a friends of friends algorithm in a large LCDM
simulation at two redshift snapshots (z=0 and 1), while halo substructure is
determined using an observationally driven method. We find in both epochs a
clear and significant signal by which haloes with substructure are more
clustered than those with no-substructure. This is true for all the considered
halo mass ranges, although for the highest halo masses the signal is noisy and
present only out to ~20 h^{-1} Mpc. There is also a smooth increase of the halo
correlation length with increasing amplitude of the halo substructure. We also
find that substructured haloes are typically located in high-density
large-scale environments, while the opposite is true for non-substructured
haloes. If the haloes found in high-density regions have a relatively earlier
formation time, as suggested by recent works, then they do indeed have more
time to cluster than haloes, of a similar mass, which form later in the
low-density regions. In such a case one would have naively expected that the
former (earlier formed) haloes would typically be dynamically more relaxed than
the latter (later formed). However, the higher merging and interaction
rate,expected in high-density regions, could disrupt their relatively relaxed
dynamical state and thus be the cause for the higher fraction of haloes with
substructure found in such regions.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 11:13:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Espino-Briones",
"N.",
""
],
[
"Plionis",
"M.",
""
],
[
"Ragone-Figueroa",
"C.",
""
]
] |
0707.2471 | Vladimir E. Moiseenko | O. Agren (1), V.E. Moiseenko (1 and 2) and A. Gustafsson (1)
((1)Uppsala University, Angstroem laboratory, Uppsala, Sweden, (2) IPP NSC
Kharkov Institute of Physics and Technology, Kharkiv, Ukraine) | On the number of independent adiabatic invariants for gyrating particles | 34 pages | null | null | null | physics.plasm-ph | null | It is pointed out that the three established adiabatic invariants are
separating invariants in the sense of Liouville. It is widely claimed that no
more than three adiabatic invariants can exist for the motion of a point
charge. However, additional independent (not separating) adiabatic invariants
do exist. For a force free motion, the components of angular momentum provide
two additional constants of motion. This result can be generalized to the
Hamilton Jacobi equation. The number of independent constants of motion is
reduced if there is a global symmetry. For a gyrating particle, neglecting a
gyro helix type of invariant, four 'useful' invariants could exist. A radial
drift invariant, corresponding to the average of the radial coordinate of the
particle, is a constant of motion for a confined gyrating particle. For the
special case of a screw pinch where each gyro center moves on a magnetic flux
surface without mirror trapping, the radial drift invariant is the radial
coordinate of the gyro center. For a screw pinch, the set of constants of
motion consising of the energy, parallel velocity and radial drift invariant is
convenient to model the equilibrium. Local Maxwellian distribution functions
expressed in this set of invariants are demonstrated to provide MHD-type of
equilibria, for which it is straightforward to model the radial profiles of the
particle and field components.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 09:53:19 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Agren",
"O.",
"",
"1 and 2"
],
[
"Moiseenko",
"V. E.",
"",
"1 and 2"
],
[
"Gustafsson",
"A.",
""
]
] |
0707.2472 | Lazhar Dhaouadi | Lazhar Dhaouadi | Applications of the q-Fourier Analysis to the Symmetric Moment Problem | null | null | null | 99 UR 1507 | math.CA | null | Sufficient condition for the symmetric moment problem to be determinate is
given using standards methods of $q$-Fourier analysis. This condition it cannot
be a particular case of Carleman's criterion.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 09:58:28 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Dhaouadi",
"Lazhar",
""
]
] |
0707.2473 | Pavel Cejnar | P. Cejnar, S. Heinze, M. Macek | Coulomb analogy for nonhermitian degeneracies near quantum phase
transitions | 4 pages | Phys.Rev.Lett.99:100601,2007 | 10.1103/PhysRevLett.99.100601 | null | quant-ph math-ph math.MP nucl-th | null | Degeneracies near the real axis in a complex-extended parameter space of a
hermitian Hamiltonian are studied. We present a method to measure distributions
of such degeneracies on the Riemann sheet of a selected level and apply it in
classification of quantum phase transitions. The degeneracies are shown to
behave similarly as complex zeros of a partition function.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 10:17:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cejnar",
"P.",
""
],
[
"Heinze",
"S.",
""
],
[
"Macek",
"M.",
""
]
] |
0707.2474 | Claudio Gheller | Marco Comparato, Ugo Becciani, Alessandro Costa, Bjorn Larsson, Bianca
Garilli, Claudio Gheller, John Taylor | Visualization, Exploration and Data Analysis of Complex Astrophysical
Data | 32 pages, 15 figures, accepted by PASP | null | 10.1086/521375 | null | astro-ph | null | In this paper we show how advanced visualization tools can help the
researcher in investigating and extracting information from data. The focus is
on VisIVO, a novel open source graphics application, which blends high
performance multidimensional visualization techniques and up-to-date
technologies to cooperate with other applications and to access remote,
distributed data archives. VisIVO supports the standards defined by the
International Virtual Observatory Alliance in order to make it interoperable
with VO data repositories. The paper describes the basic technical details and
features of the software and it dedicates a large section to show how VisIVO
can be used in several scientific cases.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 10:43:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Comparato",
"Marco",
""
],
[
"Becciani",
"Ugo",
""
],
[
"Costa",
"Alessandro",
""
],
[
"Larsson",
"Bjorn",
""
],
[
"Garilli",
"Bianca",
""
],
[
"Gheller",
"Claudio",
""
],
[
"Taylor",
"John",
""
]
] |
0707.2475 | Sanjay K. Ghosh | Abhijit Bhattacharyya, Sanjay K. Ghosh, Ritam Mallick and Sibaji Raha | Effect of General Relativity and rotation on the energy deposition rate
for $\nu + \bar{\nu} \to e^+ + e^- $ inside a compact star | 8 pages, 7 figures | null | null | null | astro-ph hep-ph | null | We have studied the $\nu + \bar{\nu} \to e^+ + e^- $ energy deposition rate
in a rotating compact star. This reaction is important for the study of gamma
ray bursts. The General Relativistic (GR) effects on the energy deposition rate
have been incorporated. We find that the efficiency of the process is larger
for a rotating star. The total energy deposition rate increases by more than an
order of magnitude due to rotation. The dependence of this energy deposition
rate on the deformation parameter of the star has also been discussed.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 10:30:10 GMT"
}
] | 2007-07-25T00:00:00 | [
[
"Bhattacharyya",
"Abhijit",
""
],
[
"Ghosh",
"Sanjay K.",
""
],
[
"Mallick",
"Ritam",
""
],
[
"Raha",
"Sibaji",
""
]
] |
0707.2476 | Jean-Pierre Luminet | M. Brassart, J.-P. Luminet (Laboratoire Univers & Theories,
Observatoire de Paris-Meudon) | Shock waves in tidally compressed stars by massive black holes | 19 pages, 38 figures, 7 tables; v2 : corrected to match version
accepted in Astron. Astrophys. Tables and references added, new simulations
also performed for adiabatic index 4/3 | null | 10.1051/0004-6361:20078264 | null | astro-ph | null | We interest in the case of a main-sequence star deeply penetrating within the
tidal radius of a massive black hole. We focus on the compression phase leading
to a so-called pancake configuration of the star at the instant of maximal
compression. The aim is to study the tidal compression process paying
particular attention to the development of shock waves;to deduce reliable
estimates of the thermodynamical quantities involved in the pancake star; and
to solve a controversy about whether or not thermonuclear reactions can be
triggered in the core of a tidally compressed star. We have set up a
one-dimensional hydrodynamical model well-adapted to the geometry of the
problem. Based on the high-resolution shock-capturing Godunov-type approach, it
allows to study the compression phase undergone by the star in the direction
orthogonal to its orbital plane. We show the existence of two regimes depending
on whether shock waves develop before or after the instant of maximal core
compression. In both cases we confirm high compression and heating factors in
the stellar core able to trigger a thermonuclear explosion. Moreover, we show
that the shock waves carry outwards a brief but very high peak of temperature
from the centre to the surface of the star. We tentatively conclude that the
phenomenon could give rise to hard electromagnetic radiation, to be compared to
some X-ray flares already observed in some galactic nuclei harbouring massive
black holes. Finally, we estimate that the rate of pancake stars should be
about $10^{-5}$ per galaxy per year. If generated in hard X- or $\gamma$-ray
band, several events of this kind per year should be detectable within the full
observable universe.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 10:43:27 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 16:50:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brassart",
"M.",
"",
"Laboratoire Univers & Theories,\n Observatoire de Paris-Meudon"
],
[
"Luminet",
"J. -P.",
"",
"Laboratoire Univers & Theories,\n Observatoire de Paris-Meudon"
]
] |
0707.2477 | Andreas Weber | Andreas Weber | $L^p$-Spectral theory of locally symmetric spaces with $Q$-rank one | null | Math. Phys. Anal. Geom. 10 (2007), no. 2, 135--154. | 10.1007/s11040-007-9026-3 | null | math.SP math.DG | null | We study the $L^p$-spectrum of the Laplace-Beltrami operator on certain
complete locally symmetric spaces $M=\Gamma\backslash X$ with finite volume and
arithmetic fundamental group $\Gamma$ whose universal covering $X$ is a
symmetric space of non-compact type. We also show, how the obtained results for
locally symmetric spaces can be generalized to manifolds with cusps of rank
one.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 10:48:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Weber",
"Andreas",
""
]
] |
0707.2478 | Matthias Scheid | Matthias Scheid, Dario Bercioux, and Klaus Richter | Zeeman ratchets: pure spin current generation in mesoscopic conductors
with non-uniform magnetic fields | 24 pages, 10 figures, as published in the New Journal of Physics -
Focus Issue on Spintronics in reduced dimensions | New J. Phys. 9, 401 (2007) | 10.1088/1367-2630/9/11/401 | null | cond-mat.mes-hall | null | We consider the possibility to employ a quantum wire realized in a
two-dimensional electron gas (2DEG) as a spin ratchet. We show that a net spin
current without accompanying net charge transport can be induced in the
nonlinear regime by an unbiased external driving via an ac voltage applied
between the contacts at the ends of the quantum wire. To achieve this we make
use of the coupling of the electron spin to inhomogenous magnetic fields
created by ferromagnetic stripes patterned on the semiconductor heterostructure
that harbours the 2DEG. Using recursive Green function techniques we
numerically study two different setups, consisting of one and two ferromagnetic
stripes, respectively.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 10:49:29 GMT"
},
{
"version": "v2",
"created": "Sat, 17 Nov 2007 10:25:14 GMT"
}
] | 2007-11-17T00:00:00 | [
[
"Scheid",
"Matthias",
""
],
[
"Bercioux",
"Dario",
""
],
[
"Richter",
"Klaus",
""
]
] |
0707.2479 | Carsten Allefeld | Carsten Allefeld, Stephan Bialonski | Detecting synchronization clusters in multivariate time series via
coarse-graining of Markov chains | Follow-up to arXiv:0706.3375. Journal submission 9 Jul 2007.
Published 19 Dec 2007 | Physical Review E 76, 066207, 2007 | 10.1103/PhysRevE.76.066207 | null | physics.data-an | null | Synchronization cluster analysis is an approach to the detection of
underlying structures in data sets of multivariate time series, starting from a
matrix R of bivariate synchronization indices. A previous method utilized the
eigenvectors of R for cluster identification, analogous to several recent
attempts at group identification using eigenvectors of the correlation matrix.
All of these approaches assumed a one-to-one correspondence of dominant
eigenvectors and clusters, which has however been shown to be wrong in
important cases. We clarify the usefulness of eigenvalue decomposition for
synchronization cluster analysis by translating the problem into the language
of stochastic processes, and derive an enhanced clustering method harnessing
recent insights from the coarse-graining of finite-state Markov processes. We
illustrate the operation of our method using a simulated system of coupled
Lorenz oscillators, and we demonstrate its superior performance over the
previous approach. Finally we investigate the question of robustness of the
algorithm against small sample size, which is important with regard to field
applications.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 10:52:04 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Oct 2007 15:05:01 GMT"
},
{
"version": "v3",
"created": "Mon, 22 Oct 2007 13:36:14 GMT"
},
{
"version": "v4",
"created": "Thu, 20 Dec 2007 13:24:19 GMT"
}
] | 2007-12-20T00:00:00 | [
[
"Allefeld",
"Carsten",
""
],
[
"Bialonski",
"Stephan",
""
]
] |
0707.2480 | Damiano Anselmi | Damiano Anselmi and Milenko Halat | Renormalization of Lorentz violating theories | 28 pages, 1 figure; v2: more references and applications, PRD version | Phys.Rev.D76:125011,2007 | 10.1103/PhysRevD.76.125011 | IFUP-TH 2007/18 | hep-th | null | We classify the unitary, renormalizable, Lorentz violating quantum field
theories of interacting scalars and fermions, obtained improving the behavior
of Feynman diagrams by means of higher space derivatives. Higher time
derivatives are not generated by renormalization. Renormalizability is ensured
by a "weighted power counting" criterion. The theories contain a dimensionful
parameter, yet a set of models are classically invariant under a weighted scale
transformation, which is anomalous at the quantum level. Formulas for the
weighted trace anomaly are derived. The renormalization-group properties are
studied.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:11:23 GMT"
},
{
"version": "v2",
"created": "Mon, 26 Nov 2007 11:54:23 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Anselmi",
"Damiano",
""
],
[
"Halat",
"Milenko",
""
]
] |
0707.2481 | Sandhya Choubey | Abhijit Bandyopadhyay, Sandhya Choubey | The (3+2) Neutrino Mass Spectrum and Double Chooz | 17 pages | null | null | null | hep-ph astro-ph hep-ex | null | The implications of extra sterile neutrinos for the Double Chooz experiment
is expounded. The so-called ``3+2'' mass spectrum with 2 sterile neutrinos
mixed with the active ones, is still allowed by the global neutrino data
including MiniBooNE. We probe its impact on the resultant reactor antineutrino
signal at the near and far detector of the Double Chooz experiment. The
oscillations driven by the additional mass squared difference due to the
sterile states bring an energy independent constant suppression at both the
near and far detectors. We study to what extent the measurement of
$\theta_{13}$ would get affected due to the presence of sterile mixing. We also
give the projected sensitivity that Double Chooz will have to constrain the
extra mixing angles associated with the sterile states.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 11:08:42 GMT"
}
] | 2007-07-19T00:00:00 | [
[
"Bandyopadhyay",
"Abhijit",
""
],
[
"Choubey",
"Sandhya",
""
]
] |
0707.2482 | Jan Ostergaard | Jan Ostergaard | Multiple-Description Lattice Vector Quantization | Ph.D. Thesis, 250 pages. (Thesis advisors: R. Heusdens and J. Jensen.
Promotor: R. Lagendijk) | Ph.D. Thesis, Delft University of Technology, ISBN
978-90-9021979-0, pp. 250, Gildeprint, June 2007 | null | null | cs.IT math.IT | null | In this thesis, we construct and analyze multiple-description codes based on
lattice vector quantization.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 11:10:52 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Ostergaard",
"Jan",
""
]
] |
0707.2483 | Benoit Semelin | B. Semelin, F. Combes, S. Baek | Lyman-alpha radiative transfer during the Epoch of Reionization:
contribution to 21-cm signal fluctuations | 13 pages, 9 figures. To be published in A&A | null | 10.1051/0004-6361:20077965 | null | astro-ph | null | During the epoch of reionization, Ly-alpha photons emitted by the first stars
can couple the neutral hydrogen spin temperature to the kinetic gas
temperature, providing the opportunity to observe the gas in emission or
absorption in the 21-cm line. Given the bright foregrounds, it is of prime
importance to determine precisely the fluctuations signature of the signal, to
be able to extract it by its correlation power.
LICORICE is a Monte-Carlo radiative transfer code, coupled to the dynamics
via an adaptative Tree-SPH code. We present here the Ly-alpha part of the
implementation, and validate it through three classical tests. Contrary to
previous works, we do not assume that P_alpha, the number of scatterings of
Ly-alpha photons per atom per second, is proportional to the Ly-alpha
background flux, but take into account the scatterings in the Ly-alpha line
wings. The latter have the effect to steepen the radial profile of P_alpha
around each source, and re-inforce the contrast of the fluctuations. In the
particular geometry of cosmic filaments of baryonic matter, Ly-alpha photons
are scattered out of the filament, and the large scale structure of P_alpha is
significantly anisotropic. This could have strong implications for the possible
detection of the 21-cm signal.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 11:33:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Semelin",
"B.",
""
],
[
"Combes",
"F.",
""
],
[
"Baek",
"S.",
""
]
] |
0707.2484 | Gad Koren | G. Koren, Y. Mor, A. Auerbach and E. Polturak | Quantum vortex tunneling in $YBa_2Cu_3O_{7-\delta}$ thin films | 5 figures | null | 10.1103/PhysRevB.76.134516 | null | cond-mat.supr-con cond-mat.str-el | null | Cuprate films offer a unique opportunity to observe vortex tunneling effects,
due to their unusually low superfluid density and short coherence length. Here,
we measure the magnetoresistance (\textit{MR}) due to vortex motion of a long
meander line of a superconducting film made of underdoped
$YBa_2Cu_3O_{7-\delta}$. At low temperatures (\textit{T}), the \textit{MR}
shows a significant deviation from Arrhenius activation. The data is consistent
with two dimensional Variable Range Hopping (VRH) of single vortices, i.e.
$MR\propto exp[-(T_0/T)^{1/3}]$. The VRH temperature scale $T_0$ depends on the
vortex tunneling rates between pinning sites. We discuss its magnitude with
respect to estimated parameters of the meander thin film.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 11:29:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Koren",
"G.",
""
],
[
"Mor",
"Y.",
""
],
[
"Auerbach",
"A.",
""
],
[
"Polturak",
"E.",
""
]
] |
0707.2485 | Jos Verdoold | Jos Verdoold, Maarten van Reeuwijk, Mark J. Tummers, Harm J. J.
Jonker, Kemo Hanjali\'c | Spectral analysis of boundary layers in Rayleigh-Benard convection | 10 pages, 6 figures, Accepted for publication in Phys. Rev. E | Phys. Rev. E 77, 016303 2008 | 10.1103/PhysRevE.77.016303 | null | physics.flu-dyn | null | A combined experimental and numerical study of the boundary layer in a 4:1
aspect-ratio Rayleigh-B\'{e}nard cell over a four-decade range of Rayleigh
numbers has been undertaken aimed at gaining a better insight into the
character of the boundary layers. The experiments involved the simultaneous
Laser Doppler Anemometry (LDA) measurements of fluid velocity at two locations,
i.e. in the boundary layer and far away from it in the bulk, for Rayleigh
numbers varying between $1.6 \times 10^7$ and $2.4 \times 10^9$. In parallel,
direct numerical simulations (DNS) have been performed for the same
configuration for Rayleigh numbers between $7.0 \times 10^4$ and $7.7 \times
10^7$. The temperature and velocity probability density functions and the power
spectra of the horizontal velocity fluctuations measured in the boundary layer
and in the bulk flow are found to be practically identical. Except for the
smallest Rayleigh numbers, the spectra in the boundary layer and in the bulk
central region are continuous and have a wide range of active scales. This
indicates that both the bulk and the boundary layers are turbulent in the
$\textrm{Ra}$ number range considered. However, molecular effects can still be
observed and the boundary layer does not behave like a classical shear-driven
turbulent boundary layer.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 11:40:39 GMT"
},
{
"version": "v2",
"created": "Wed, 21 Nov 2007 10:04:48 GMT"
}
] | 2008-05-25T00:00:00 | [
[
"Verdoold",
"Jos",
""
],
[
"van Reeuwijk",
"Maarten",
""
],
[
"Tummers",
"Mark J.",
""
],
[
"Jonker",
"Harm J. J.",
""
],
[
"Hanjalić",
"Kemo",
""
]
] |
0707.2486 | Armine Rostmoyan | Armine Rostomyan, Jeroen Dreschler (on behalf of the HERMES
collaboration) | Transverse Target-Spin Asymmetry of Exclusive $\rho^0$ Meson Production
on Proton at HERMES | DIS2007 proceedings | null | null | null | hep-ex | null | Preliminary measurements are reported on the azimuthal single-spin asymmetry
of exclusive rho0 mesons for a transversely polarized hydrogen target at HERMES
using the 27.6 GeV HERA positron beam. Within the generalized parton
distribution (GPD) formalism, this asymmetry is sensitive to the total angular
momentum of quarks and gluons in the nucleon. Since the GPD formalism is only
valid for mesons produced by longitudinal photons, the transverse target-spin
asymmetry of longitudinal rho0 mesons is extracted assuming s-channel helicity
conservation and compared to theoretical calculations.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 11:53:20 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Rostomyan",
"Armine",
"",
"on behalf of the HERMES\n collaboration"
],
[
"Dreschler",
"Jeroen",
"",
"on behalf of the HERMES\n collaboration"
]
] |
0707.2487 | Lieven Vandersypen | Jeroen B. Oostinga, Hubert B. Heersche, Xinglan Liu, Alberto F.
Morpurgo and Lieven M. K. Vandersypen (Kavli Institute of Nanoscience, TU
Delft) | Gate-induced insulating state in bilayer graphene devices | 17 pages, 5 figures | Nature Materials, published online 2 dec 2007 | 10.1038/nmat2082 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | The potential of graphene-based materials consisting of one or a few layers
of graphite for integrated electronics originates from the large
room-temperature carrier mobility in these systems (approx. 10,000 cm2/Vs).
However, the realization of electronic devices such as field-effect transistors
will require controlling and even switching off the electrical conductivity by
means of gate electrodes, which is made difficult by the absence of a bandgap
in the intrinsic material. Here, we demonstrate the controlled induction of an
insulating state - with large suppression of the conductivity - in bilayer
graphene, by using a double-gate device configuration that allows an electric
field to be applied perpendicular to the plane. The dependence of the
resistance on temperature and electric field, and the absence of any effect in
a single-layer device, strongly suggest that the gate-induced insulating state
originates from the recently predicted opening of a bandgap between valence and
conduction bands.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 11:43:46 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Dec 2007 09:45:36 GMT"
}
] | 2007-12-04T00:00:00 | [
[
"Oostinga",
"Jeroen B.",
"",
"Kavli Institute of Nanoscience, TU\n Delft"
],
[
"Heersche",
"Hubert B.",
"",
"Kavli Institute of Nanoscience, TU\n Delft"
],
[
"Liu",
"Xinglan",
"",
"Kavli Institute of Nanoscience, TU\n Delft"
],
[
"Morpurgo",
"Alberto F.",
"",
"Kavli Institute of Nanoscience, TU\n Delft"
],
[
"Vandersypen",
"Lieven M. K.",
"",
"Kavli Institute of Nanoscience, TU\n Delft"
]
] |
0707.2488 | Grzegorz Kapustka | Grzegorz Kapustka | Primitive contractions of Calabi-Yau threefolds II | 20 pages, to appear in JLMS | null | 10.1112/jlms/jdn069 | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct 16 new examples of Calabi--Yau threefolds with Picard group of
rank 1. Each of these examples is obtained by smoothing the image of a
primitive contraction with exceptional divisor being a del Pezzo surface of
degree 6, 7 or $\mathbb{P}^1\times \mathbb{P}^1$.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 11:44:39 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Oct 2007 16:25:51 GMT"
},
{
"version": "v3",
"created": "Thu, 25 Sep 2008 09:40:34 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Kapustka",
"Grzegorz",
""
]
] |
0707.2489 | Evgenii Maksimov | E. G. Maksimov, O. V. Dolgov | A Little About Folklore | 5 pages | null | null | null | cond-mat.supr-con | null | Comment on paper by P.W. Anderson is presented. This Anderson's work is shown
to contain a number of inaccurate and ungrounded statements. We point out, in
particular, that the total static dielectric function not only can be negative,
but inevitably has a minus sign in many stable systems. We also demonstrate
that in many metals, the effective electron-phonon interaction is stronger than
the direct Coulomb repulsion, without taking into account the ladder-sum
renormalization or pseudization of the Coulomb repulsion. Other issues touched
in Anderson's paper are also discussed.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:11:39 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Maksimov",
"E. G.",
""
],
[
"Dolgov",
"O. V.",
""
]
] |
0707.2490 | David Lumb | D. H. Lumb, F. E. Christensen, C. P. Jensen, M. Krumrey | Influence of a carbon over-coat on the X-ray reflectance of XEUS mirrors | 7 pages, 5 separate figures Accepted Optics Communications | null | 10.1016/j.optcom.2007.06.049 | null | astro-ph | null | We describe measurements of the X-ray reflectance in the range 2 to 10 keV of
samples representative of coated silicon wafers that are proposed for the
fabrication of the XEUS (X-ray Evolving Universe Spectrometer) mission. We
compare the reflectance of silicon samples coated with bare Pt, with that for
samples with an additional 10nm thick carbon over-coating. We demonstrate a
significant improvement in reflectance in the energy range ~1 to 4 keV, and at
a grazing incidence angle of 10 mrad (0.57 degrees). We consider the resulting
effective area that could be attained with an optimized design of the XEUS
telescope. Typically an improvement of 10 to 60 % in effective area, depending
on photon energy, can be achieved using the carbon overcoat.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:10:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lumb",
"D. H.",
""
],
[
"Christensen",
"F. E.",
""
],
[
"Jensen",
"C. P.",
""
],
[
"Krumrey",
"M.",
""
]
] |
0707.2491 | Yonatan Sivan | Stefan Le-Coz, Reika Fukuizumi, Gadi Fibich, Baruch Ksherim, Yonatan
Sivan | Instability of bound states of a nonlinear Schr\"odinger equation with a
Dirac potential | null | null | 10.1016/j.physd.2007.12.004 | null | nlin.PS nlin.SI | null | We study analytically and numerically the stability of the standing waves for
a nonlinear Schr\"odinger equation with a point defect and a power type
nonlinearity. A main difficulty is to compute the number of negative
eigenvalues of the linearized operator around the standing waves, and it is
overcome by a perturbation method and continuation arguments. Among others, in
the case of a repulsive defect, we show that the standing wave solution is
stable in $\hurad$ and unstable in $\hu$ under subcritical nonlinearity.
Further we investigate the nature of instability: under critical or
supercritical nonlinear interaction, we prove the instability by blowup in the
repulsive case by showing a virial theorem and using a minimization method
involving two constraints. In the subcritical radial case, unstable bound
states cannot collapse, but rather narrow down until they reach the stable
regime (a {\em finite-width instability}). In the non-radial repulsive case,
all bound states are unstable, and the instability is manifested by a lateral
drift away from the defect, sometimes in combination with a finite-width
instability or a blowup instability.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:26:23 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Dec 2007 10:04:59 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Le-Coz",
"Stefan",
""
],
[
"Fukuizumi",
"Reika",
""
],
[
"Fibich",
"Gadi",
""
],
[
"Ksherim",
"Baruch",
""
],
[
"Sivan",
"Yonatan",
""
]
] |
0707.2492 | Xiaoping Yang | Xiaoping Yang, Gang Wu, Jinming Dong | Structural transformations of double-walled carbon nanotube bundle under
hydrostatic pressure | 9 pages, 2 figures | Applied Physics Letters 89, 113101 (2006) | 10.1063/1.2266529 | null | cond-mat.mtrl-sci | null | Three kinds of the response mechanisms to the external pressure have been
found for double-walled carbon nanotube (DWNT) bundle, depending strongly on
their average radius and symmetry. The small-diameter DWNT bundle undergoes a
small discontinuous volume change, and then deform continuously. The
intermediate-diameter DWNT bundle collapses completely after a structure phase
transition (SPT). Significantly, two SPTs exist for the larger-diameter DWNT
bundle if the outer tube has no $C_{6}$ or $C_{3}$ symmetry. It would be
interesting to search for signatures of these different structural
transformations by experimentally investigating mechanical, optical and thermal
response functions of DWNT bundle.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:20:02 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Yang",
"Xiaoping",
""
],
[
"Wu",
"Gang",
""
],
[
"Dong",
"Jinming",
""
]
] |
0707.2493 | Paolo Gambino | P. Gambino, P. Giordano, G. Ossola and N. Uraltsev | Inclusive semileptonic B decays and the determination of |V_ub| | 35 pages, 15 figures; v2: improved presentation, updated exp inputs,
version published in JHEP | JHEP 0710:058,2007 | 10.1088/1126-6708/2007/10/058 | DFTT-14/2007, UND-HEP-07-BIG 06 | hep-ph | null | We study the triple differential distribution of B-> Xu l nu, consistently
including all perturbative and non-perturbative effects through O(alphas^2
beta_0) and O(1/mb^3). The Fermi motion is parameterized in terms of a single
light-cone function for each structure function and for any value of q^2,
accounting for all subleading effects. We discuss the problems and
uncertainties related to the high-q^2 tail and to Weak Annihilation effects. We
work in the kinetic scheme, a framework characterized by a Wilsonian treatment
with a hard cutoff mu ~ 1GeV. Our method is illustrated with the extraction of
|V_ub| from some of the latest experimental data, providing a detailed estimate
of the theoretical uncertainty.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 16:29:06 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Oct 2007 12:18:43 GMT"
}
] | 2009-02-18T00:00:00 | [
[
"Gambino",
"P.",
""
],
[
"Giordano",
"P.",
""
],
[
"Ossola",
"G.",
""
],
[
"Uraltsev",
"N.",
""
]
] |
0707.2494 | Jean-Pierre Rivet | Yves Rabbia (LG), Jean Gay (LG), Jean-Pierre Rivet (OCA) | The Achromatic Interfero Coronagraph | null | Comptes Rendus Physique 8:385,2007 | 10.1016/j= | null | astro-ph | null | We report on the Achromatic Interfero Coronagraph, a focal imaging device
which aims at rejecting the energy contribution of a point-like source set
on-axis, so as to make detectable its angularly-close environment (applicable
to stellar environment: circumstellar matter, faint companions, planetary
systems, but also conceivably to Active Galatic Nucleii and multiple
asteroids). With AIC, starlight rejection is based on destructive interference,
which allows exploration of the star's neighbouring at angular resolution
better than the diffraction limit of the hosting telescope. Thanks to the focus
crossing property of light, rejection is achromatic thus yielding a large
spectral bandwidth of work. Descriptions and comments are given regarding the
principle, the device itself, the constraints and limitations, and the
theoretical performance. Results are presented which demonstrate the
close-sensing capability and which show images of a companion obtained in
laboratory and 'on the sky' as well. A short pictorial description of
alternative AIC concepts, CIAXE and Open-Air CIAXE, currently under study, is
given.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:24:09 GMT"
}
] | 2009-07-09T00:00:00 | [
[
"Rabbia",
"Yves",
"",
"LG"
],
[
"Gay",
"Jean",
"",
"LG"
],
[
"Rivet",
"Jean-Pierre",
"",
"OCA"
]
] |
0707.2495 | Xiaoping Yang | Xiaoping Yang, Jinming Dong | Geometrical and electronic structures of the (5, 3) single-walled gold
nanotube from first-principles calculations | 11 pages, 4 figures | Physical Review B 71, 233403 (2005) | 10.1103/PhysRevB.71.233403 | null | cond-mat.mtrl-sci | null | The geometrical and electronic structures of the 4 {\AA} diameter perfect and
deformed (5, 3) single-walled gold nanotube (SWGT) have been studied based upon
the density-functional theory in the local-density approximation (LDA). The
calculated relaxed geometries show clearly significant deviations from those of
the ideally rolled triangular gold sheet. It is found that the different
strains have different effects on the electronic structures and density of
states of the SWGTs. And the small shear strain can reduce the binding energy
per gold atom of the deformed SWGT, which is consistent with the experimentally
observed result. Finally, we found the finite SWGT can show the
metal-semiconductor transition.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:29:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yang",
"Xiaoping",
""
],
[
"Dong",
"Jinming",
""
]
] |
0707.2496 | Jordi Vidal-Perona | J. Bernabeu, G.A. Gonzalez-Sprinberg, J. Papavassiliou and J. Vidal | Tau anomalous magnetic moment form factor at Super B/Flavor factories | 20 pages, 4 figures | Nucl.Phys.B790:160-174,2008 | 10.1016/j.nuclphysb.2007.09.001 | FTUV-07-1607 | hep-ph | null | The proposed high-luminosity B/Flavor factories offer new opportunities for
the improved determination of the fundamental physical parameters of standard
heavy leptons. Compared to the electron or the muon case, the magnetic
properties of the $\tau$ lepton are largely unexplored. We show that the
electromagnetic properties of the $\tau$, and in particular its magnetic form
factor, may be measured competitively in these facilities, using unpolarized or
polarized electron beams. Various observables of the $\tau$'s produced on top
of the $\Upsilon$ resonances, such as cross-section and normal polarization for
unpolarized electrons or longitudinal and transverse asymmetries for polarized
beams, can be combined in order to increase the sensitivity on the magnetic
moment form factor. In the case of polarized electrons, we identify a special
combination of transverse and longitudinal $\tau$ polarizations able to
disentangle this anomalous magnetic form factor from both the charge form
factor and the interference with the Z-mediating amplitude. For an integrated
luminosity of $15 \times 10^{18} b^{-1}$ one could achieve a sensitivity of
about $10^{-6}$, which is several orders of magnitude below any other existing
high- or low-energy bound on the magnetic moment. Thus one may obtain a QED
test of this fundamental quantity to a few % precision.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:30:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bernabeu",
"J.",
""
],
[
"Gonzalez-Sprinberg",
"G. A.",
""
],
[
"Papavassiliou",
"J.",
""
],
[
"Vidal",
"J.",
""
]
] |
0707.2497 | Gad Koren | G. Aharonovich, G. Koren and E. Polturak | A study of the ferromagnetic transition of $SrRuO_3$ in nanometer thick
bilayers with $YBa_2Cu_3O_y$, $La_{1.88}Sr_{0.12}CuO_{4-y}$, Au and Cr:
Signature of injected carriers in the pseudogap regime | 9 figures | null | 10.1103/PhysRevB.76.224514 | null | cond-mat.supr-con cond-mat.str-el | null | The hypothesis regarding the existence of uncorrelated pre-formed pairs in
the pseudogap regime of superconducting $YBa_2Cu_3O_y$ is tested experimentally
using bilayers of $YBa_2Cu_3O_y$ and the itinerant ferromagnet $SrRuO_3$. In
our study, we monitor the influence of $YBa_2Cu_3O_y$ on $T_p$, the
ferromagnetic ordering temperature of $SrRuO_3$. Here, $T_p$ is the temperature
of maximum dM/dT or dR/dT where M and R are the magnetization and resistance of
$SrRuO_3$, respectively. We compare the results with similar measurements
carried out on bilayers of $La_{1.88}Sr_{0.12}CuO_{4-y}$, $Au$ and $Cr$ with
$SrRuO_3$. We find that in bilayers made of underdoped 10 nm $YBa_2Cu_3O_y$/5
nm $SrRuO_3$, the $T_p$ values are shifted to lower temperatures by up to 6-8 K
as compared to $T_p\approx 140$ K of the 5 nm thick reference $SrRuO_3$ film.
In contrast, in the other type of bilayers, which are not in the pseudogap
regime near $T_p$, only a smaller shift of up to $\pm$2 K is observed. These
differences are discussed in terms of a proximity effect, where carriers from
the $YBa_2Cu_3O_y$ layer are injected into the $SrRuO_3$ layer and vice versa.
We suggest that correlated electrons in the pseudogap regime of $YBa_2Cu_3O_y$
are responsible for the observed large $T_p$ shifts.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:31:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Aharonovich",
"G.",
""
],
[
"Koren",
"G.",
""
],
[
"Polturak",
"E.",
""
]
] |
0707.2498 | Yannick Ponty | Yannick Ponty (OCA), Jean-Phillipe Laval (LML), Berengere Dubrulle
(SPEC), Fran\c{c}ois Daviaud (SPEC), Jean-Fran\c{c}ois Pinton (Phys-ENS) | Subcritical dynamo bifurcation in the Taylor Green flow | 4 pages | null | 10.1103/PhysRevLett.99.224501 | null | physics.flu-dyn astro-ph | null | We report direct numerical simulations of dynamo generation for flow
generated using a Taylor-Green forcing. We find that the bifurcation is
subcritical, and show its bifurcation diagram. We connect the associated
hysteretic behavior with hydrodynamics changes induced by the action of the
Lorentz force. We show the geometry of the dynamo magnetic field and discuss
how the dynamo transition can be induced when an external field is applied to
the flow.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:31:26 GMT"
},
{
"version": "v2",
"created": "Tue, 24 Jul 2007 06:50:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ponty",
"Yannick",
"",
"OCA"
],
[
"Laval",
"Jean-Phillipe",
"",
"LML"
],
[
"Dubrulle",
"Berengere",
"",
"SPEC"
],
[
"Daviaud",
"François",
"",
"SPEC"
],
[
"Pinton",
"Jean-François",
"",
"Phys-ENS"
]
] |
0707.2499 | Jean-Pierre Rivet | Fabrice Debbasch (LERMA), Jean-Pierre Rivet (OCA), Willem Van Leeuwen | Invariance of the relativistic one-particle distribution function | null | Physica A301:181,2001 | 10.1016/S0378-4371(01)00359-4 | null | astro-ph | null | The one-particle distribution function is of importance both in
non-relativistic and relativistic statistical physics. In the relativistic
framework, Lorentz invariance is possibly its most fundamental property. The
present article on the subject is a contrastive one: we review, discuss
critically, and, when necessary, complete, the treatments found in the standard
literature.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:32:23 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Debbasch",
"Fabrice",
"",
"LERMA"
],
[
"Rivet",
"Jean-Pierre",
"",
"OCA"
],
[
"Van Leeuwen",
"Willem",
""
]
] |
0707.2500 | Victor H. Moll | Dante Manna and Victor H. Moll | Landen survey | 28 pages, 1 figure | null | null | null | math.CA | null | Landen transformations are maps on the coefficients of an integral that
preserve its value. We present a brief survey of their appearnce in the
literature.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:35:17 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Manna",
"Dante",
""
],
[
"Moll",
"Victor H.",
""
]
] |
0707.2501 | Xiaoping Yang | Xiaoping Yang, Gang Wu, Jinming Dong | Single-walled carbon nanotube bundle under hydrostatic pressure studied
by the first-principles calculations | 14 pages, 6 figures | Physical Review B 73, 235403 (2006) | 10.1103/PhysRevB.73.235403 | null | cond-mat.mtrl-sci | null | The structural, electronic, optical and vibrational properties of the
collapsed (10,10) single-walled carbon nanotube bundle under hydrostatic
pressure have been studied by the first-principles calculations. Some features
are observed in the present study: First, a collapsed structure is found, which
is distinct from both of the herringbone and parallel structures obtained
previously. Secondly, a pseudo-gap induced by the collapse appears along the
symmetry axis \textit{$\Gamma $X}. Thirdly, the relative orientation between
the collapsed tubes has an important effect on their electronic, optical and
vibrational properties, which provides an efficient experimental method to
distinguish unambiguously three different collapsed structures.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:36:13 GMT"
},
{
"version": "v2",
"created": "Wed, 18 Jul 2007 11:43:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yang",
"Xiaoping",
""
],
[
"Wu",
"Gang",
""
],
[
"Dong",
"Jinming",
""
]
] |
0707.2502 | Xiaoping Yang | Xiaoping Yang, Jinming Dong | Electronic and Transport Properties of Radially Deformed Double-walled
Carbon Nanotube Intramolecular Junction | 11 pages, 4 figures | Physics Letters A 330, 238 (2004) | 10.1016/j.physleta.2004.08.006 | null | cond-mat.mtrl-sci | null | The electronic and transport property of a radially deformed double-walled
carbon nanotube (DWNT) intramolecular junction (IMJ) has been studied by the
tight-binding (TB) model combined with the first-principle calculations. The
geometrical structures of the DWNT IMJ have been first optimized in energy by
the universal force field (UFF) method. It is found that when heavily squashed,
the DWNT will become an insulator-coated metallic wire, and the conductance
near the Fermi level has been significantly changed by the radial squash.
Specially, several resonance conductance peaks appear at some energies in the
conduction band of the squashed DWNT IMJ. Finally, we have also investigated
the conductance variation due to change of the length of the central
semiconductor in the squashed DWNT IMJ. Furthermore, a promising pure carbon
nanoscale electronic device is proposed based on the DWNT IMJ.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:40:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yang",
"Xiaoping",
""
],
[
"Dong",
"Jinming",
""
]
] |
0707.2503 | X. H. Chen | X. G. Luo, Y. C. Jing, H. Chen and X. H. Chen | Intergrowth and thermoelectric properties in the Bi-Ca-Co-O system | 8 pages, 7 figures. To be published in Journal of Crystal Growth | J. Cryst. Growth 308, 309-313 (2007) | 10.1016/j.jcrysgro.2007.07.037 | null | cond-mat.mtrl-sci cond-mat.str-el | null | Single crystals of the Bi-Ca-Co-O system have been grown using the flux
method with cooling from 900$\celsius$ and 950$\celsius$, respectively. The
single crystals are characterized by transmission electron microscopy and X-ray
diffraction. The misfit cobaltite
[Ca$_2$Bi$_{1.4}$Co$_{0.6}$O$_4$]$^{RS}$[CoO$_2$]$_{1.69}$ single crystals with
quadruple ($n$=4) rocksalt (RS) layer are achieved with cooling from
900$\celsius$. Such crystal exhibits room-temperature thermoelectric power
(TEP) of 180$\mu$V/K, much larger than that in Sr-based misfit cobaltites with
quadruple RS layer. However, intergrowth of single crystals of quadruple
($n$=4) and triple ($n$=3) RS-type layer-based misfit cobaltites is observed
with cooling from 950$\celsius$. Both of TEP and resistivity were obviously
enhanced by the intergrowth compared to
[Ca$_2$Bi$_{1.4}$Co$_{0.6}$O$_4$]$^{RS}$[CoO$_2$]$_{1.69}$ single crystal,
while the power factor at room temperature remains unchanged.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:43:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Luo",
"X. G.",
""
],
[
"Jing",
"Y. C.",
""
],
[
"Chen",
"H.",
""
],
[
"Chen",
"X. H.",
""
]
] |
0707.2504 | Xing-Gang Wu | Xing-Gang Wu, Tao Huang and Zhen-Yun Fang | $B\to K$ Transition Form Factor up to ${\cal O}(1/m^2_b)$ within the
$k_T$ Factorization Approach | 22 pages and 6 figures | Eur.Phys.J.C52:561-570,2007 | 10.1140/epjc/s10052-007-0421-5 | null | hep-ph | null | In the paper, we apply the $k_T$ factorization approach to deal with the
$B\to K$ transition form factor $F^{B\to K}_{+,0}(q^2)$ in the large recoil
regions. The B-meson wave functions $\Psi_B$ and $\bar\Psi_B$ that include the
three-particle Fock states' contributions are adopted to give a consistent PQCD
analysis of the form factor up to ${\cal O} (1/m^2_b)$. It has been found that
both the wave functions $\Psi_B$ and $\bar\Psi_B$ can give sizable
contributions to the form factor and should be kept for a better understanding
of the $B$ meson decays. Then the contributions from different twist structures
of the kaon wavefunction are discussed, including the $SU_f(3)$-breaking
effects. A sizable contribution from the twist-3 wave function $\Psi_p$ is
found, whose model dependence is discussed by taking two group of parameters
that are determined by different distribution amplitude moments obtained in the
literature. It is also shown that $F^{B\to K}_{+,0}(0)=0.30\pm0.04$ and
$[F^{B\to K}_{+,0}(0)/F^{B\to \pi}_{+,0}(0)]=1.13\pm0.02$, which are more
reasonable and consistent with the light-cone sum rule results in the large
recoil regions.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:44:22 GMT"
},
{
"version": "v2",
"created": "Sat, 1 Sep 2007 14:59:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wu",
"Xing-Gang",
""
],
[
"Huang",
"Tao",
""
],
[
"Fang",
"Zhen-Yun",
""
]
] |
0707.2505 | Joseph H. Silverman | Patrick Ingram, Joseph H. Silverman | Primitive Divisors in Arithmetic Dynamics | Version 2 is substantial revision. The proof of the main theorem has
been simplified and strengthened. (16 pages) | Proc. Camb. Philos. Soc. 146 #2 (2009), 289--302 | 10.1017/S0305004108001795 | null | math.NT math.DS | null | Let F(z) be a rational function in Q(z) of degree at least 2 with F(0) = 0
and such that F does not vanish to order d at 0. Let b be a rational number
having infinite orbit under iteration of F, and write F^n(b) = A_n/B_n as a
fraction in lowest terms. We prove that for all but finitely many n > 0, the
numerator A_n has a primitive divisor, i.e., there is a prime p such that p
divides A_n and p does not divide A_i for all i < n. More generally, we prove
an analogous result when F is defined over a number field and 0 is a periodic
point for F.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:47:12 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Jul 2007 15:10:24 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Ingram",
"Patrick",
""
],
[
"Silverman",
"Joseph H.",
""
]
] |
0707.2506 | Alain Dutech | Raghav Aras (INRIA Lorraine - LORIA), Alain Dutech (INRIA Lorraine -
LORIA), Fran\c{c}ois Charpillet (INRIA Lorraine - LORIA) | Mixed Integer Linear Programming For Exact Finite-Horizon Planning In
Decentralized Pomdps | null | Dans The International Conference on Automated Planning and
Scheduling (2007) | null | null | cs.AI | null | We consider the problem of finding an n-agent joint-policy for the optimal
finite-horizon control of a decentralized Pomdp (Dec-Pomdp). This is a problem
of very high complexity (NEXP-hard in n >= 2). In this paper, we propose a new
mathematical programming approach for the problem. Our approach is based on two
ideas: First, we represent each agent's policy in the sequence-form and not in
the tree-form, thereby obtaining a very compact representation of the set of
joint-policies. Second, using this compact representation, we solve this
problem as an instance of combinatorial optimization for which we formulate a
mixed integer linear program (MILP). The optimal solution of the MILP directly
yields an optimal joint-policy for the Dec-Pomdp. Computational experience
shows that formulating and solving the MILP requires significantly less time to
solve benchmark Dec-Pomdp problems than existing algorithms. For example, the
multi-agent tiger problem for horizon 4 is solved in 72 secs with the MILP
whereas existing algorithms require several hours to solve it.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 12:49:30 GMT"
}
] | 2016-03-28T00:00:00 | [
[
"Aras",
"Raghav",
"",
"INRIA Lorraine - LORIA"
],
[
"Dutech",
"Alain",
"",
"INRIA Lorraine -\n LORIA"
],
[
"Charpillet",
"François",
"",
"INRIA Lorraine - LORIA"
]
] |
0707.2507 | Marie Rastello | Marie Rastello (LMFA), Alexi Bouchet (ETGR) | Surface oscillations in channeled snow flows | null | Cold Regions Science and Technology (02/08/2007) 49, 134-144 | 10.1016/j.coldregions.2007.03.003 | null | physics.class-ph | null | An experimental device has been built to measure velocity profiles and
friction laws in channeled snow flows. The measurements show that the velocity
depends linearly on the vertical position in the flow and that the friction
coefficient is a first-order polynomial in velocity (u) and thickness (h) of
the flow. In all flows, oscillations on the surface of the flow were observed
throughout the channel and measured at the location of the probes. The
experimental results are confronted with a shallow water approach. Using a
Saint-Venant modeling, we show that the flow is effectively uniform in the
streamwise direction at the measurement location. We show that the surface
oscillations produced by the Archimedes's screw at the top of the channel
persist throughout the whole length of the channel and are the source of the
measured oscillations. This last result provides good validation of the
description of such channeled snow flows by a Saint-Venant modeling.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:01:56 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jul 2007 08:41:26 GMT"
}
] | 2007-07-23T00:00:00 | [
[
"Rastello",
"Marie",
"",
"LMFA"
],
[
"Bouchet",
"Alexi",
"",
"ETGR"
]
] |
0707.2508 | Oleg Lychkovskiy | Oleg Lychkovskiy | Analysis of the SN1987A two-stage explosion hypothesis with account for
the MSW neutrino flavour conversion | presented at "Rencontres de Moriond EW 2007", 10-17 March 2007 | Rencontres de Moriond 2007: Electroweak Interactions and Unified
Theories, the Gioi Publishers, p.515 | null | null | astro-ph | null | Detection of 5 events by the Liquid Scintillation Detector (LSD) on February,
23, 1987 was interpreted in the literature as the detection of neutrinos from
the first stage of the two-stage supernova collapse. We pose rigid constraints
on the properties of the first stage of the collapse, taking into account
neutrino flavour conversion due to the MSW-effect and general properties of
supernova neutrino emission. The constraints depend on the unknown neutrino
mass hierarchy and mixing angle \theta_{13}.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:03:42 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Dec 2007 15:04:55 GMT"
}
] | 2008-11-03T00:00:00 | [
[
"Lychkovskiy",
"Oleg",
""
]
] |
0707.2509 | Maxim V. Polyakov | M.V. Polyakov | Tomography for amplitudes of hard exclusive processes | 13 pages, no figures, misprints are corrected | Phys.Lett.B659:542-550,2008 | 10.1016/j.physletb.2007.11.012 | null | hep-ph hep-ex nucl-ex | null | We discuss which part of information about hadron structure encoded in the
Generalized Parton Distributions (GPDs) [part of total GPD image] can be
restored from the known amplitude of a hard exclusive process. The physics
content of this partial image is analyzed. Among other things, we show that
this partial image contains direct information about how the target hadron
responses to the (string) quark-antiquark operator of {\it arbitrary} spin J.
Explicit equations relating physics content of the partial image of GPDs
directly to the data are derived. Also some new results concerning the dual
parametrization of GPDs are presented.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:04:23 GMT"
},
{
"version": "v2",
"created": "Sun, 29 Jul 2007 16:13:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Polyakov",
"M. V.",
""
]
] |
0707.2510 | Are R. Raklev | S. Lola (Patras U.), P. Osland and A.R. Raklev (Bergen U.) | Radiative gravitino decays from R-parity violation | 17 pages, 5 figures | Phys.Lett.B656:83-90,2007 | 10.1016/j.physletb.2007.09.048 | CERN-PH-TH/2007-122 | hep-ph | null | We study radiative gravitino decay within the framework of R-violating
supersymmetry. For trilinear R-violating couplings that involve the third
generation of fermions, or for light gravitinos, we find that the radiative
loop-decay $\tilde{G} \to \gamma \nu$ dominates over the tree-level ones for a
wide set of parameters. We calculate the gravitino decay width and study its
implications for cosmology and collider physics. Slow-decaying gravitinos are
good dark matter candidates, for a range of parameters that would also predict
observable R-violating signatures in colliders. In general the branching ratios
are very dependent on the relative hierarchies of R-violating operators, and
may provide relevant information on the flavour structure of the underlying
fundamental theory.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:14:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lola",
"S.",
"",
"Patras U."
],
[
"Osland",
"P.",
"",
"Bergen U."
],
[
"Raklev",
"A. R.",
"",
"Bergen U."
]
] |
0707.2511 | Stefan Fredenhagen | Stefan Fredenhagen, Matthias R. Gaberdiel, Christoph A. Keller | Symmetries of perturbed conformal field theories | 30 pages, 3 figures. V2: Small error in eq. (2.14) corrected | J.Phys.A40:13685-13710,2007 | 10.1088/1751-8113/40/45/012 | AEI-2007-098 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The symmetries of perturbed conformal field theories are analysed. We explain
which generators of the chiral algebras of a bulk theory survive a perturbation
by an exactly marginal bulk field. We also study the behaviour of D-branes
under current-current bulk deformations. We find that the branes always
continue to preserve as much symmetry as they possibly can, i.e. as much as is
preserved in the bulk. We illustrate these findings with several examples,
including permutation branes in WZW models and B-type D-branes in Gepner
models.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:16:21 GMT"
},
{
"version": "v2",
"created": "Sun, 20 Jul 2008 07:18:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fredenhagen",
"Stefan",
""
],
[
"Gaberdiel",
"Matthias R.",
""
],
[
"Keller",
"Christoph A.",
""
]
] |
0707.2512 | Bludov Yuliy | F. Kh. Abdullaev, Yu. V. Bludov, S. V. Dmitriev, P. G. Kevrekidis, V.
V. Konotop | Generalized Neighbor-Interaction Models Induced by Nonlinear Lattices | null | PHYSICAL REVIEW E 77, 016604 (2008) | 10.1103/PhysRevE.77.016604 | null | cond-mat.other nlin.PS | null | It is shown that the tight-binding approximation of the nonlinear
Schr\"odinger equation with a periodic linear potential and periodic in space
nonlinearity coefficient gives rise to a number of nonlinear lattices with
complex, both linear and nonlinear, neighbor interactions. The obtained
lattices present non-standard possibilities, among which we mention a
quasi-linear regime, where the pulse dynamics obeys essentially the linear
Schr{\"o}dinger equation. We analyze the properties of such models both in
connection with their modulational stability, as well as in regard to the
existence and stability of their localized solitary wave solutions.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:17:38 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Abdullaev",
"F. Kh.",
""
],
[
"Bludov",
"Yu. V.",
""
],
[
"Dmitriev",
"S. V.",
""
],
[
"Kevrekidis",
"P. G.",
""
],
[
"Konotop",
"V. V.",
""
]
] |
0707.2513 | Lipsa Nanda | Lipsa Nanda and S. Anantha Ramakrishna | Time for pulse traversal through slabs of dispersive and negative
($\epsilon$, $\mu$) materials | 9 pages, 9 figures, Submitted to Phys. Rev. A | Phys. Rev. A 76, 063807 (2007) | 10.1103/PhysRevA.76.063807 | null | cond-mat.mtrl-sci cond-mat.other physics.optics | null | The traversal times for an electromagnetic pulse traversing a slab of
dispersive and dissipative material with negative dielectric permittivity
($\epsilon$) and magnetic permeability ($\mu$) have been calculated by using
the average flow of electromagnetic energy in the medium. The effects of
bandwidth of the pulse and dissipation in the medium have been investigated.
While both large bandwidth and large dissipation have similar effects in
smoothening out the resonant features that appear due to Fabry-P\'{e}rot
resonances, large dissipation can result in very small or even negative
traversal times near the resonant frequencies. We have also investigated the
traversal times and Wigner delay times for obliquely incident pulses and
evanescent pulses. The coupling to slab plasmon polariton modes in frequency
ranges with negative $\epsilon$ or $\mu$ is shown to result in large traversal
times at the resonant conditions. We also find that the group velocity mainly
contributes to the delay times for pulse propagating across a slab with n=-1.
We have checked that the traversal times are positive and subluminal for pulses
with sufficiently large bandwidths.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:20:12 GMT"
}
] | 2008-12-05T00:00:00 | [
[
"Nanda",
"Lipsa",
""
],
[
"Ramakrishna",
"S. Anantha",
""
]
] |
0707.2514 | Vadim Nikolayev | O. Clus (SPE), Jalil Ouazzani (ICMCB), M. Muselli (SPE), Vadim
Nikolayev (SBT, PMMH), Girja Sharan, D. Beysens (SBT, PMMH) | Radiation-cooled Dew Water Condensers Studied by Computational Fluid
Dynamic (CFD) | null | 2006 European PHOENICS User Meeting, 30/11-1/12 2006, Wimbledon,
London, UK (CD-ROM) (2006) 1 | null | null | physics.flu-dyn | null | Harvesting condensed atmospheric vapour as dew water can be an alternative or
complementary potable water resource in specific arid or insular areas. Such
radiation-cooled condensing devices use already existing flat surfaces (roofs)
or innovative structures with more complex shapes to enhance the dew yield. The
Computational Fluid Dynamic - CFD - software PHOENICS has been programmed and
applied to such radiation cooled condensers. For this purpose, the sky
radiation is previously integrated and averaged for each structure. The
radiative balance is then included in the CFD simulation tool to compare the
efficiency of the different structures under various meteorological parameters,
for complex or simple shapes and at various scales. It has been used to precise
different structures before construction. (1) a 7.32 m^2 funnel shape was
studied; a 30 degree tilted angle (60 degree cone half-angle) was computed to
be the best compromise for funnel cooling. Compared to a 1 m^2 flat condenser,
the cooling efficiency was expected to be improved by 40%. Seventeen months
measurements in outdoor tests presented a 138 % increased dew yield as compared
to the 1 m^2 flat condenser. (2) The simulation results for 5 various condenser
shapes were also compared with experimental measurement on corresponding pilots
systems: 0.16 m^2 flat planar condenser, 1 m^2 and 30 degree tilted planar
condenser, 30 m^2 and 30 degree tilted planar condenser, 255 m^2 multi ridges,
a preliminary construction of a large scale dew plant being implemented in the
Kutch area (Gujarat, India).
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:23:42 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Clus",
"O.",
"",
"SPE"
],
[
"Ouazzani",
"Jalil",
"",
"ICMCB"
],
[
"Muselli",
"M.",
"",
"SPE"
],
[
"Nikolayev",
"Vadim",
"",
"SBT, PMMH"
],
[
"Sharan",
"Girja",
"",
"SBT, PMMH"
],
[
"Beysens",
"D.",
"",
"SBT, PMMH"
]
] |
0707.2515 | Barbara Schapira | Yves Coudene (IRMAR), Barbara Schapira (LAMFA) | Generic measures for hyperbolic flows on non compact spaces | null | null | null | null | math.DS | null | We consider the geodesic flow on a complete connected negatively curved
manifold. We show that the set of invariant borel probability measures contains
a dense $G_\delta$-subset consisting of ergodic measures fully supported on the
non-wandering set. We also trat the case of non-positively curved manifolds and
provide general tools to deal with hyperbolic systems defined on non-compact
spaces.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:27:29 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Coudene",
"Yves",
"",
"IRMAR"
],
[
"Schapira",
"Barbara",
"",
"LAMFA"
]
] |
0707.2516 | Margherita Grossi | M. Grossi, K. Dolag, E. Branchini, S. Matarrese, L. Moscardini | Evolution of Massive Haloes in non-Gaussian Scenarios | 7 pages,3 figures, submitted to MNRAS | Mon.Not.Roy.Astron.Soc.382:1261,2007 | 10.1111/j.1365-2966.2007.12458.x | null | astro-ph | null | We have performed high-resolution cosmological N-body simulations of a
concordance LCDM model to study the evolution of virialized, dark matter haloes
in the presence of primordial non-Gaussianity. Following a standard procedure,
departures from Gaussianity are modeled through a quadratic Gaussian term in
the primordial gravitational potential, characterized by a dimensionless
non-linearity strength parameter f_NL. We find that the halo mass function and
its redshift evolution closely follow the analytic predictions of Matarrese et
al.(2000). The existence of precise analytic predictions makes the observation
of rare, massive objects at large redshift an even more attractive test to
detect primordial non-Gaussian features in the large scale structure of the
universe.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:33:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Grossi",
"M.",
""
],
[
"Dolag",
"K.",
""
],
[
"Branchini",
"E.",
""
],
[
"Matarrese",
"S.",
""
],
[
"Moscardini",
"L.",
""
]
] |
0707.2517 | Frederic Decremps | Frederic Decremps (IMPMC), Laurent Belliard (INSP), Bernard Perrin
(INSP), Michel Gauthier (IMPMC) | Sound velocity and absorption measurements under high pressure using
picosecond ultrasonics in diamond anvil cell. Application to the stability
study of AlPdMn | null | Physical Review Letters 100 (2008) 35502 | 10.1103/PhysRevLett.100.035502 | null | cond-mat.mtrl-sci | null | We report an innovative high pressure method combining the diamond anvil cell
device with the technique of picosecond ultrasonics. Such an approach allows to
accurately measure sound velocity and attenuation of solids and liquids under
pressure of tens of GPa, overcoming all the drawbacks of traditional
techniques. The power of this new experimental technique is demonstrated in
studies of lattice dynamics, stability domain and relaxation process in a
metallic sample, a perfect single-grain AlPdMn quasicrystal, and rare gas, neon
and argon. Application to the study of defect-induced lattice stability in
AlPdMn up to 30 GPa is proposed. The present work has potential for application
in areas ranging from fundamental problems in physics of solid and liquid
state, which in turn could be beneficial for various other scientific fields as
Earth and planetary science or material research.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:34:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Decremps",
"Frederic",
"",
"IMPMC"
],
[
"Belliard",
"Laurent",
"",
"INSP"
],
[
"Perrin",
"Bernard",
"",
"INSP"
],
[
"Gauthier",
"Michel",
"",
"IMPMC"
]
] |
0707.2518 | E. V. Sampathkumaran | T. Nakano, Kausik Sengupta, Sudhindra Rayaprol, M. Hedo, Y. Uwatoko
and E.V. Sampathkumaran | Positive and negative pressure effects on the magnetic ordering and the
Kondo effect in the compound Ce2RhSi3 | null | J> Phys.: Condens. Matter 19 (2007) 326205 | 10.1088/0953-8984/19/32/326205 | null | cond-mat.str-el cond-mat.mtrl-sci | null | The competition between magnetic ordering and the Kondo effect in Ce2RhSi3,
ordering antiferromagnetically at 7 K, is investigated by the measurements of
magnetization, heat capacity and electrical resistivity on the solid solutions,
Ce(2-x)La(x)RhSi3, Ce(2-y)Y(y)RhSi3, and Ce2RhSi(3-z)Ge(z), as well as by high
pressure studies on this compound. The trends in the Kondo and Neel temperature
variations among these alloys are compared to infer the roles of unit-cell
volume and electronic structure changes. On the basis of the results, we infer
that this compound lies at the peak of Doniach-magnetic-phase-diagram. The high
pressure electrical resistivity data indicate that the quantum critical point
for this compound is in the vicinity of 4 GPa.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:35:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nakano",
"T.",
""
],
[
"Sengupta",
"Kausik",
""
],
[
"Rayaprol",
"Sudhindra",
""
],
[
"Hedo",
"M.",
""
],
[
"Uwatoko",
"Y.",
""
],
[
"Sampathkumaran",
"E. V.",
""
]
] |
0707.2519 | Jose Natario | Filipe C. Mena, Jose Natario and Paul Tod | Gravitational Collapse to Toroidal and Higher Genus asymptotically AdS
Black Holes | 15 pages, 2 figures; v2: typos corrected, references added | Adv.Theor.Math.Phys. 12 (2008) 1163-1181 | null | null | gr-qc astro-ph hep-th | null | We match collapsing inhomogeneous as well as spatially homogeneous but
anisotropic spacetimes to vacuum static exteriors with a negative cosmological
constant and planar or hyperbolic symmetry. The collapsing interiors include
the inhomogeneous solutions of Szekeres and of Barnes, which in turn include
the Lemaitre-Tolman and the McVittie solutions. The collapse can result in
toroidal or higher genus asymptotically AdS black holes.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:35:52 GMT"
},
{
"version": "v2",
"created": "Thu, 3 Apr 2008 10:55:03 GMT"
}
] | 2008-07-15T00:00:00 | [
[
"Mena",
"Filipe C.",
""
],
[
"Natario",
"Jose",
""
],
[
"Tod",
"Paul",
""
]
] |
0707.2520 | Dr. Paul J. Werbos | Paul J. Werbos | Schwinger's Magnetic Model of Matter: Can It Help Us With Grand
Unification? | utter heresy claiming that new mathematical results from quantum
optics and new results on scattering and mass spectra suggest that maybe
Einstein was right after all -- with a classical stochastic unified model.
Updated 1/2008 to add additional confirmatory info from CERN & info on
questions in appendix | null | null | null | physics.gen-ph physics.class-ph | null | Many have argued that research on grand unification or local realistic
physics will not be truly relevant until it makes predictions verified by
experiment, different from the prediction of prior theory (the standard model).
This paper proposes a new strategy (and candidate Lagrangians) for such models;
that strategy in turn calls for reconsideration of Schwinger's magnetic model
of matter. High priority should be given to experiments which fully confirm or
deny recent scattering calculations which suggest the presence of van der Waals
effects in low energy p-p and pi-pi scattering, consistent with Schwinger's
model and inconsistent with QCD as we know it (with a mass gap). I briefly
discuss other evidence, which does not yet rule out Schwinger's theory. A
recent analysis of hadron masses also seems more consistent with the Schwinger
model than with QCD.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 14:58:37 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Jan 2008 13:48:08 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Werbos",
"Paul J.",
""
]
] |
0707.2521 | Tai-De Li | Tai-De Li and Elisa Riedo | Nonlinear viscoelastic dynamics of nano-confined water | 4 Figures | null | 10.1103/PhysRevLett.100.106102 | null | cond-mat.soft | null | The viscoelastic dynamics of nano-confined water is studied by means of
atomic force microscopy (AFM). We observe a nonlinear viscoelastic behavior
remarkably similar to that widely observed in metastable complex fluids. We
show that the origin of the measured nonlinear viscoelasticity in nano-confined
water is a strain rate dependent relaxation time and slow dynamics. By
measuring the viscoelastic modulus at different frequencies and strains, we
find that the intrinsic relaxation time of nano-confined water is in the range
0.1-0.0001 s, orders of magnitude longer than that of bulk water, and
comparable to the dielectric relaxation time measured in supercooled water at
170-210 K.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:42:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Li",
"Tai-De",
""
],
[
"Riedo",
"Elisa",
""
]
] |
0707.2522 | B\'ela Csaba | B\'ela Csaba | On embedding well-separable graphs | 11 pages, submitted for publication | null | null | null | math.CO | null | Call a simple graph $H$ of order $n$ well-separable, if by deleting a
separator set of size $o(n)$ the leftover will have components of size at most
$o(n)$. We prove, that bounded degree well-separable spanning subgraphs are
easy to embed: for every $\gamma >0$ and positive integer $\Delta$ there exists
an $n_0$ such that if $n>n_0$, $\Delta(H) \le \Delta$ for a well-separable
graph $H$ of order $n$ and $\delta(G) \ge (1-{1 \over 2(\chi(H)-1)} + \gamma)n$
for a simple graph $G$ of order $n$, then $H \subset G$. We extend our result
to graphs with small band-width, too.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:46:11 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Csaba",
"Béla",
""
]
] |
0707.2523 | Magno Machado | V.P. Goncalves, M.V.T. Machado | Quarkonium production in coherent hadron-hadron interactions at the LHC | null | Phys.Rev.D77:014037,2008 | 10.1103/PhysRevD.77.014037 | null | hep-ph | null | The photoproduction of quarkonium in coherent hadron-hadron (pp/pA/AA$)
interactions for LHC energies is an important tool to investigate the QCD
dynamics at high energies. In this paper we estimate the integrated cross
section and rapidity distribution for J/Psi and Upsilon production using the
Color Glass Condensate (CGC) formalism. We predict large rates, implying that
the experimental identification could be feasible at the LHC.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:46:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Goncalves",
"V. P.",
""
],
[
"Machado",
"M. V. T.",
""
]
] |
0707.2524 | Sam Harper | CDF Collaboration: T. Aaltonen, et al | Search for New Physics in High Mass Electron-Positron Events in ppbar
Collisions at sqrt(s) = 1.96 TeV | 7 pages, 4 figures. To be submitted to Phys. Rev. Lett | Phys.Rev.Lett.99:171802,2007 | 10.1103/PhysRevLett.99.171802 | FERMILAB-PUB-07-367-E | hep-ex | null | We report the results of a search for a narrow resonance in electron-positron
events in the invariant mass range of 150-950 GeV/c^2 using 1.3 fb^-1 of ppbar
collision data at sqrt(s) = 1.96 TeV collected by the CDF II detector at
Fermilab. No significant evidence of such a resonance is observed and we
interpret the results to exclude the standard model-like Z' with a mass below
923 GeV/c^2 and the Randall-Sundrum graviton with a mass below 807 GeV/c^2 for
k/M_pl=0.1, both at the 95% confidence level. Combining with di-photon data
excludes the Randall-Sundrum graviton for masses below 889 GeV/c^2 for
k/M_pl=0.1.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:49:49 GMT"
}
] | 2010-05-12T00:00:00 | [
[
"CDF Collaboration",
"",
""
],
[
"Aaltonen",
"T.",
""
]
] |
0707.2525 | Paul Federbush | Paul Federbush | Tilings With Very Elastic Tiles | 25 pages | null | null | null | math-ph math.MP | null | We consider tiles of some fixed size, with an associated weighting on the
shapes of tile, of total mass 1. We study the pressure, $p$, of tilings with
those tiles; the pressure, one over the volume times the logarithm of the
partition function. (The quantity we define as "pressure" could, perhaps
equally harmoniously with physics notation, be called "entropy per volume",
neither nomenclature is "correct".) We let $\hat p^0$ (easy to compute) be the
pressure in the limit of absolute smoothness (the weighting function is
constant). Then as smoothness, suitably defined, increases, $p$ converges to
$\hat p^0$, uniformly in the volume. It is the uniformity requirement that
makes the result non-trivial. This seems like a very basic result in the theory
of pressure of tilings. Though at the same time, perhaps non-glamorous, being
bereft of geometry and not very difficult. The problem arose for us out of
study of a problem in mathematical physics, associated to a model of
ferromagnetism.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:54:48 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Federbush",
"Paul",
""
]
] |
0707.2526 | Rachid Guernane | Rachid Guernane | Heavy flavour production in ALICE | Proceedings of the Symposium on Hadron Collider Physics, Durham,
North Carolina (USA), 22-26 May 2006 | null | null | null | hep-ex | null | We review the most recent studies on the performance of ALICE in heavy
flavour production measurements in both hadronic and semileptonic decay
channels.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 13:58:47 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Guernane",
"Rachid",
""
]
] |
0707.2527 | Anders Gjendemsj{\o} | Anders Gjendemsj{\o}, Geir E. {\O}ien, Henrik Holm, Mohamed-Slim
Alouini, David Gesbert, Kjell J. Hole and P{\aa}l Orten | Rate and Power Allocation for Discrete-Rate Link Adaptation | 9 pages, 8 figures, submitted to the EURASIP Journal on Wireless
Communications and Networking, July 2007 | null | null | null | cs.IT math.IT | null | Link adaptation, in particular adaptive coded modulation (ACM), is a
promising tool for bandwidth-efficient transmission in a fading environment.
The main motivation behind employing ACM schemes is to improve the spectral
efficiency of wireless communication systems. In this paper, using a finite
number of capacity achieving component codes, we propose new transmission
schemes employing constant power transmission, as well as discrete and
continuous power adaptation, for slowly varying flat-fading channels.
We show that the proposed transmission schemes can achieve throughputs close
to the Shannon limits of flat-fading channels using only a small number of
codes. Specifically, using a fully discrete scheme with just four codes, each
associated with four power levels, we achieve a spectral efficiency within 1 dB
of the continuous-rate continuous-power Shannon capacity. Furthermore, when
restricted to a fixed number of codes, the introduction of power adaptation has
significant gains with respect to ASE and probability of no transmission
compared to a constant power scheme.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 14:16:18 GMT"
}
] | 2016-03-28T00:00:00 | [
[
"Gjendemsjø",
"Anders",
""
],
[
"Øien",
"Geir E.",
""
],
[
"Holm",
"Henrik",
""
],
[
"Alouini",
"Mohamed-Slim",
""
],
[
"Gesbert",
"David",
""
],
[
"Hole",
"Kjell J.",
""
],
[
"Orten",
"Pål",
""
]
] |
0707.2528 | Iver Brevik | Ole Jakob Birkeland and Iver Brevik | On the Feigel Effect: Extraction of Momentum from Vacuum? | 26 pages LaTeX, one figure; discussion expanded, especially in
section 6, references added. Version to appear in Phys. Rev. E | null | 10.1103/PhysRevE.76.066605 | null | quant-ph hep-th | null | The Green-function formalism for the electromagnetic field in a
magnetoelectric (ME) medium is constructed, as a generalization of conventional
Casimir theory. Zero temperature is assumed. It is shown how the formalism
predicts electromagnetic momentum to be extracted from the vacuum field, just
analogous to how energy is extracted in the Casimir case. The possibility of
extracting momentum from vacuum was discussed recently by Feigel [Phys. Rev.
Lett. 92, 020404 (2004)]. By contrast to Feigel's approach, we assume that the
ME coupling occurs naturally, and is not produced by external strong fields. We
also find the same effect qualitatively via another route, by considering one
single electromagnetic mode.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 14:17:58 GMT"
},
{
"version": "v2",
"created": "Wed, 31 Oct 2007 14:30:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Birkeland",
"Ole Jakob",
""
],
[
"Brevik",
"Iver",
""
]
] |
0707.2529 | Ren-Bao Liu | W. Yang and R. B. Liu | Decoherence of coupled electron spins via nuclear spin dynamics in
quantum dots | 4 pages 3 figures | PHYSICAL REVIEW B 77, 085302 (2008) | 10.1103/PhysRevB.77.085302 | null | cond-mat.mes-hall | null | In double quantum dots, the exchange interaction between two electron spins
renormalizes the excitation energy of pair-flips in the nuclear spin bath,
which in turn modifies the non-Markovian bath dynamics. As the energy
renormalization varies with the Overhauser field mismatch between the quantum
dots, the electron singlet-triplet decoherence resulting from the bath dynamics
depends on sampling of nuclear spin states from an ensemble, leading to the
transition from exponential decoherence in single-sample dynamics to power-law
decay under ensemble averaging. In contrast, the decoherence of a single
electron spin in one dot is essentially the same for different choices of the
nuclear spin configuration.
| [
{
"version": "v1",
"created": "Tue, 17 Jul 2007 14:25:41 GMT"
}
] | 2008-03-07T00:00:00 | [
[
"Yang",
"W.",
""
],
[
"Liu",
"R. B.",
""
]
] |
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