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711.3508 | Anh Vinh Le | Le Anh Vinh | Explicit Ramsey graphs and Erdos distance problem over finite Euclidean
and non-Euclidean spaces | null | The Electronics Journal of Combinatorics, 15 (2008), R5 | null | null | math.CO | null | We study the Erdos distance problem over finite Euclidean and non-Euclidean
spaces. Our main tools are graphs associated to finite Euclidean and
non-Euclidean spaces that are considered in Bannai-Shimabukuro-Tanaka (2004,
2007). These graphs are shown to be asymptotically Ramanujan graphs. The
advantage of using these graphs is twofold. First, we can derive new lower
bounds on the Erdos distance problems with explicit constants. Second, we can
construct many explicit tough Ramsey graphs R(3,k).
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 06:00:46 GMT"
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] | 2008-02-09T00:00:00 | [
[
"Vinh",
"Le Anh",
""
]
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711.3509 | Jeff Tallon | N. Suresh, J.G. Storey, G.V.M. Williams and J.L. Tallon | Pressure dependence of the oxygen isotope effect in YBa$_2$Cu$_4$O$_8$ | 4 pages, 1 figures, submitted to Phys. Rev. B | null | 10.1103/PhysRevB.78.100503 | null | cond-mat.supr-con | null | We have carried out measurements of the pressure dependence to 1.2 GPa of the
oxygen isotope effect on $T_c$ in the high-$T_c$ superconductor
YBa$_2$Cu$_4$O$_8$ using a clamp cell in a SQUID magnetometer. This compound
lies close to, but just above, the 1/8$^{th}$ doping point where in
La$_{2-x}$Sr$_x$CuO$_4$ marked anomalies in isotope effects occur. Both
isotopes show the same very large pressure dependence of $T_c$ with the result
that the isotope exponent remains low ($\sim$0.08) but increases slightly with
increasing pressure. This is discussed in terms of stripe suppression, a
competing pseudogap and the effect of superconducting fluctuations.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 06:10:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Suresh",
"N.",
""
],
[
"Storey",
"J. G.",
""
],
[
"Williams",
"G. V. M.",
""
],
[
"Tallon",
"J. L.",
""
]
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711.351 | Zhiqin Lu | Zhiqin Lu | Proof of the normal scalar curvature conjecture | null | null | null | null | math.DG | null | In this paper, we proved the normal scalar curvature conjecture and the
Bottcher-Wenzel conjecture.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 06:15:44 GMT"
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] | 2007-11-26T00:00:00 | [
[
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"Zhiqin",
""
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-0.0208139643,
0.0555183962,
-0.0878642723,
-0.0059833354,
0.0749954879,
-0.0560401045,
-0.068561092,
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] |
711.3511 | Reza Asgari | R. Asgari, M. M. Vazifeh, M. R. Ramezanali, E. Davoudi, B. Tanatar | Effect of disorder on the ground-state properties of graphene | Extended introduction and discussion. To appear in Phys. Rev. B | Phys. Rev. B 77, 125432 (2008) | 10.1103/PhysRevB.77.125432 | null | cond-mat.mes-hall cond-mat.dis-nn | null | We calculate the ground-state energy of Dirac electrons in graphene in the
presence of disorder. We take randomly distributed charged impurities at a
fixed distance from the graphene sheet and surface fluctuations (ripples) as
the main scattering mechanisms. Mode-coupling approach to scattering rate and
random-phase approximation for ground-state energy incorporating the many-body
interactions and the disorder effects yields good agreement with experimental
inverse compressibility.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 06:33:47 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 06:26:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Asgari",
"R.",
""
],
[
"Vazifeh",
"M. M.",
""
],
[
"Ramezanali",
"M. R.",
""
],
[
"Davoudi",
"E.",
""
],
[
"Tanatar",
"B.",
""
]
] | [
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] |
711.3512 | Ramakrishnan Balakrishnan | B. Ramakrishnan and Brundaban Sahu | Rankin-Cohen Brackets and van der Pol-Type Identities for the
Ramanujan's Tau Function | 14 pages | null | null | null | math.NT | null | We use Rankin-Cohen brackets for modular forms and quasimodular forms to give
a different proof of the results obtained by D. Lanphier and D. Niebur on the
van der Pol type identities for the Ramanujan's tau function. As consequences
we obtain convolution sums and congruence relations involving the divisor
functions.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 07:03:33 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Ramakrishnan",
"B.",
""
],
[
"Sahu",
"Brundaban",
""
]
] | [
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] |
711.3513 | Julien Roques | Julien Roques (DMA) | Galois groups of the Lie-irreducible generalized $q$-hypergeometric
equations of order three with $q$-real parameters : an approach using a
density theorem | null | null | null | null | math.CA | null | In this paper we compute the difference Galois groups of the Lie-irreducible
regular singular generalized q-hypergeometric equations of order 3 with q-real
parameters by using a density theorem due to Sauloy. In contrast with the
differential case, we show that these groups automatically contain the special
linear group SL(3,C).
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 07:10:22 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Roques",
"Julien",
"",
"DMA"
]
] | [
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] |
711.3514 | Ryszard Szwarc | Ryszard Szwarc | The ratio and generating function of cogrowth coefficients of finitely
generated groups | null | Studia Mathematica 131 (1998), 89-94 | null | null | math.FA math.GR | null | Let G be a group generated by $r$ elements $g_1,g_2,..., g_r.$ Among the
reduced words in $g_1,g_2,..., g_r$ of length $n$ some, say $\gamma_n,$
represent the identity element of the group $G.$ It has been shown in a
combinatorial way that the $2n$th root of $\gamma_{2n}$ has a limit, called the
cogrowth exponent with respect to generators $g_1,g_2,..., g_r.$ We show by
analytic methods that the numbers $\gamma_n$ vary regularly; i.e. the ratio
$\gamma_{2n+2}/\gamma_{2n}$ is also convergent. Moreover we derive new precise
information on the domain of holomorphy of $\gamma(z),$ the generating function
associated with the coefficients $\gamma_n.$
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 07:58:23 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Szwarc",
"Ryszard",
""
]
] | [
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711.3515 | Kenji Bekki dr | Kenji Bekki, Masashi Chiba, and N. M. McClure-Griffiths | The Magellanic impact: Collision between the outer Galactic HI disk and
the leading arms of the Magellanic stream | 13pages, 4 figures, accepted by ApJL | null | 10.1086/526456 | null | astro-ph | null | We show that collisions between the outer Galactic HI disk and the leading
arms (LAs) of the Magellanic stream (MS) can create giant HI holes and
chimney-like structures in the disk. Based on the results of our N-body
simulations on the last 2.5 Gyr evolution of the Large and Small Magellanic
Clouds (LMC and SMC, respectively) interacting with the Galaxy, we investigate
when and where the LAs can pass through the Galactic plane after the MS
formation. We then investigate hydrodynamical interaction between LAs and the
Galactic HI disk (``the Magellanic impact'') by using our new hydrodynamical
simulations with somewhat idealized models of the LAs. We find that about 1-3%
of the initial gas mass of the SMC, which consists of the LAs, can pass through
the outer part (R=20-35 kpc) of the Galactic HI disk about 0.2 Gyr ago. We also
find that the Magellanic impact can push out some fraction (~1%) of the outer
Galactic HI disk to form 1-10 kpc-scale HI holes and chimney-like bridges
between the LAs and the disk.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 08:07:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bekki",
"Kenji",
""
],
[
"Chiba",
"Masashi",
""
],
[
"McClure-Griffiths",
"N. M.",
""
]
] | [
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] |
711.3516 | Dr. Rukmani Mohanta | R. Mohanta, A.K. Giri | Probing the unparticle signal in $b \to d $ penguin processes | 12 pages, 4 figures, version to appear in Phys. Lett. B | Phys.Lett.B660:376-381,2008 | 10.1016/j.physletb.2008.01.009 | null | hep-ph | null | We investigate the effect of unparticles in the pure $ b \to d $ penguin
processes $ B^0 \to K^0 \bar K^0$ and $B^{+,0} \to \phi \pi^{+,0} $. Since
these processes receive dominant contributions due to the {\it top} quark in
the loop, direct and mixing-induced CP asymmetry parameters in these processes
are expected to be vanishingly small in the standard model. We find that due to
the unparticle effect sizable nonzero CP violation could be possible in these
channels.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 08:10:51 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Jan 2008 04:18:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mohanta",
"R.",
""
],
[
"Giri",
"A. K.",
""
]
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] |
711.3517 | Pablo Arrighi | Pablo Arrighi, Vincent Nesme, Reinhard Werner | One-dimensional quantum cellular automata over finite, unbounded
configurations | 9 pages, revtex, 8 figures | 2nd Int. Conf. on Language and Automata Theory and Applications,
LATA 2008, Spain. Proceedings to appear in LNCS. | null | null | quant-ph | null | One-dimensional quantum cellular automata (QCA) consist in a line of
identical, finite dimensional quantum systems. These evolve in discrete time
steps according to a local, shift-invariant unitary evolution. By local we mean
that no instantaneous long-range communication can occur. In order to define
these over a Hilbert space we must restrict to a base of finite, yet unbounded
configurations. We show that QCA always admit a two-layered block
representation, and hence the inverse QCA is again a QCA. This is a striking
result since the property does not hold for classical one-dimensional cellular
automata as defined over such finite configurations. As an example we discuss a
bijective cellular automata which becomes non-local as a QCA, in a rare case of
reversible computation which does not admit a straightforward quantization. We
argue that a whole class of bijective cellular automata should no longer be
considered to be reversible in a physical sense. Note that the same two-layered
block representation result applies also over infinite configurations, as was
previously shown for one-dimensional systems in the more elaborate formalism of
operators algebras [9]. Here the proof is made simpler and self-contained,
moreover we discuss a counterexample QCA in higher dimensions.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 18:20:31 GMT"
}
] | 2008-04-15T00:00:00 | [
[
"Arrighi",
"Pablo",
""
],
[
"Nesme",
"Vincent",
""
],
[
"Werner",
"Reinhard",
""
]
] | [
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] |
711.3518 | Eberhard Klempt | Eberhard Klempt | Exotic mesons: status and future | Pleanry talk at Hadron07, Frascati, Italy, October 8-12, 2007 | null | null | null | hep-ph | null | The evidence for the existence of mesons with exotic quantum numbers and of
hybrid candidates with non-exotic quantum numbers is critically reviewed,
including candidates with hidden charm. Aims and methods of future searches for
hybrid mesons are briefly discussed.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 08:38:46 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Klempt",
"Eberhard",
""
]
] | [
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] |
711.3519 | Pulak Ranjan Giri | Pulak Ranjan Giri, S. K. Chakrabarti | Quantization of exciton in magnetic field background | 5 pages, 1 figure | Mod.Phys.Lett. A24:321-329, 2009 | 10.1142/S0217732309028175 | SINP/TNP/2007/32 | quant-ph hep-th math-ph math.MP | null | The possible mismatch between the theoretical and experimental absorption of
the edge peaks in semiconductors in a magnetic field background may arise due
to the approximation scheme used to analytically calculate the absorption
coefficient. As a possible remedy we suggest to consider nontrivial boundary
conditions on x-y plane by in-equivalently quantizing the exciton in background
magnetic field. This inequivalent quantization is based on von Neumann's method
of self-adjoint extension, which is characterized by a parameter \Sigma. We
obtain bound state solution and scattering state solution, which in general
depend upon the self-adjoint extension parameter \Sigma. The parameter \Sigma
can be used to fine tune the optical absorption coefficient K(\Sigma) to match
with the experiment.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 08:59:55 GMT"
}
] | 2009-02-26T00:00:00 | [
[
"Giri",
"Pulak Ranjan",
""
],
[
"Chakrabarti",
"S. K.",
""
]
] | [
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] |
711.352 | DaeKil Park | Eylee Jung, Mi-Ra Hwang, DaeKil Park, Jin-Woo Son, S. Tamaryan | Perfect Quantum Teleportation and Superdense coding with $P_{max} = 1/2$
states | 9 pages, no figure, V2: 11 pages. Prove that two general 3-qubit
states, which allow the perfect quantum teleportation, have $P_{max} = 1/2$ | null | null | null | quant-ph | null | We conjecture that criterion for perfect quantum teleportation is that the
Groverian entanglement of the entanglement resource is $1/\sqrt{2}$. In order
to examine the validity of our conjecture we analyze the quantum teleportation
and superdense coding with $|\Phi> = (1/\sqrt{2}) (|00q_1> + |11q_2>)$, where
$|q_1>$ and $|q_2>$ are arbitrary normalized single qubit states. It is shown
explicitly that $|\Phi>$ allows perfect two-party quantum teleportation and
superdense coding scenario. Next we compute the Groverian measures for
$|\psi>=\sqrt{1/2 - b^2}|100>+b |010>+a|001> +\sqrt{1/2-a^2}|111>$ and
$|\tilde{\psi}>=a|000>+b|010>+\sqrt{1/2 - (a^2+b^2)}|100> + (1/\sqrt{2})
|111>$, which also allow the perfect quantum teleportation. It is shown that
both states have $1/\sqrt{2}$ Groverian entanglement measure, which strongly
supports that our conjecture is valid.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 08:57:19 GMT"
},
{
"version": "v2",
"created": "Thu, 8 May 2008 13:27:34 GMT"
}
] | 2008-05-08T00:00:00 | [
[
"Jung",
"Eylee",
""
],
[
"Hwang",
"Mi-Ra",
""
],
[
"Park",
"DaeKil",
""
],
[
"Son",
"Jin-Woo",
""
],
[
"Tamaryan",
"S.",
""
]
] | [
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] |
711.3521 | Michael R. Pennington | M.R. Pennington and D.J. Wilson | How adding zero to the complex relation between production and
scattering amplitudes found by van Beveren and Rupp gives the expected real
relation | 3 pages, 1 figure | null | null | DCPT/07/188, IPPP/07/92 | hep-ph | null | If a hadronic production process is dominated by two body final state
interactions, the amplitude $A$ for the production process can be expanded as a
sum of the scattering amplitudes $T$ for the relevant two body channels. Van
Beveren and Rupp have claimed that the unitarity relation ${\rm {Im}} A= T^\dag
A$ can be satisfied if the coefficients in this expansion are complex. We
demonstrate that the coefficients have to be real if the scattering amplitudes
$T$ satisfy unitarity. Van Beveren and Rupp have merely written real
coefficients as a sum of complex numbers.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 08:57:22 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Pennington",
"M. R.",
""
],
[
"Wilson",
"D. J.",
""
]
] | [
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] |
711.3522 | Akaki Rusetsky | J. Gasser (Bern U.), V.E. Lyubovitskij (Tuebingen U.), A. Rusetsky
(Bonn U., HISKP) | Hadronic atoms in QCD + QED | 140 pages, 19 postscript figures, the replaced version contains an
additional reference | Phys.Rept.456:167-251,2008 | 10.1016/j.physrep.2007.09.006 | HISKP-TH-07-20 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the theory of hadronic atoms in QCD + QED, based on a
non-relativistic effective Lagrangian framework. We first provide an
introduction to the theory, and then describe several applications:
meson-meson, meson-nucleon atoms and meson-deuteron compounds. Finally, we
compare the quantum field theory framework used here with the traditional
approach, which is based on quantum-mechanical potential scattering.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 09:02:29 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Mar 2009 16:57:10 GMT"
}
] | 2009-03-11T00:00:00 | [
[
"Gasser",
"J.",
"",
"Bern U."
],
[
"Lyubovitskij",
"V. E.",
"",
"Tuebingen U."
],
[
"Rusetsky",
"A.",
"",
"Bonn U., HISKP"
]
] | [
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] |
711.3523 | Juan Carlos Morales | J.C. Morales, I. Ribas, C. Jordi | The effect of activity on stellar temperatures and radii | 8 pages, 6 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20078324 | null | astro-ph | null | Recent analyses of low-mass eclipsing binary stars have unveiled a
significant disagreement between the observations and the predictions of
stellar structure models. Results show that theoretical models underestimate
the radii and overestimate the effective temperatures of low-mass stars but
yield luminosities that accord with observations. A hypothesis based upon the
effects of stellar activity was put forward to explain the discrepancies. In
this paper we study the existence of the same trend in single active stars and
provide a consistent scenario to explain systematic differences between active
and inactive stars in the H-R diagram reported earlier. The analysis is done
using single field stars of spectral types late-K and M and computing their
bolometric magnitudes and temperatures through infrared colours and spectral
indices. The properties of the stars in samples of active and inactive stars
are compared statistically to reveal systematic differences. After accounting
for a number of possible bias effects, active stars are shown to be cooler than
inactive stars of similar luminosity therefore implying a larger radius as
well, in proportions that are in excellent agreement with those found from
eclipsing binaries. The present results generalise the existence of strong
radius and temperature dependences on stellar activity to the entire population
of low-mass stars, regardless of their membership in close binary systems.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 09:14:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Morales",
"J. C.",
""
],
[
"Ribas",
"I.",
""
],
[
"Jordi",
"C.",
""
]
] | [
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] |
711.3524 | Rafal Moderski | M. Sikora (1), R. Moderski (1), G. M. Madejski (2 and 3) ((1) Nicolaus
Copernicus Astronomical Center, (2) Stanford Linear Accelerator Center, (3)
Kavli Institute for Particle Astrophysics and Cosmology) | 3C454.3 reveals the structure and physics of its 'blazar zone' | 19 pages, 3 figures, accepted for publication in ApJ | Astrophys.J.675:71-78,2008 | 10.1086/526419 | null | astro-ph | null | Recent multi-wavelength observations of 3C454.3, in particular during its
giant outburst in 2005, put severe constraints on the location of the 'blazar
zone', its dissipative nature, and high energy radiation mechanisms. As the
optical, X-ray, and millimeter light-curves indicate, significant fraction of
the jet energy must be released in the vicinity of the millimeter-photosphere,
i.e. at distances where, due to the lateral expansion, the jet becomes
transparent at millimeter wavelengths. We conclude that this region is located
at ~10 parsecs, the distance coinciding with the location of the hot dust
region. This location is consistent with the high amplitude variations observed
on ~10 day time scale, provided the Lorentz factor of a jet is ~20. We argue
that dissipation is driven by reconfinement shock and demonstrate that X-rays
and gamma-rays are likely to be produced via inverse Compton scattering of
near/mid IR photons emitted by the hot dust. We also infer that the largest
gamma-to-synchrotron luminosity ratio ever recorded in this object - having
taken place during its lowest luminosity states - can be simply due to weaker
magnetic fields carried by a less powerful jet.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 09:06:16 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Sikora",
"M.",
"",
"2 and 3"
],
[
"Moderski",
"R.",
"",
"2 and 3"
],
[
"Madejski",
"G. M.",
"",
"2 and 3"
]
] | [
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] |
711.3525 | Debasish Chatterjee | Debasish Chatterjee and Daniel Liberzon | Towards ISS disturbance attenuation for randomly switched systems | 6 pages, to appear in the Proceedings of the 46th IEEE Conference on
Decision & Control, 2007 | Proceedings of the 46th IEEE Conference on Decision and Control,
New Orleans, LA, Dec 2007, pp. 5612-5617 | 10.1109/CDC.2007.4434163 | null | math.OC | null | We are concerned with input-to-state stability (ISS) of randomly switched
systems. We provide preliminary results dealing with sufficient conditions for
stochastic versions of ISS for randomly switched systems without control
inputs, and with the aid of universal formulae we design controllers for
ISS-disturbance attenuation when control inputs are present. Two types of
switching signals are considered: the first is characterized by a statistically
slow-switching condition, and the second by a class of semi-Markov processes.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 09:09:22 GMT"
}
] | 2010-09-08T00:00:00 | [
[
"Chatterjee",
"Debasish",
""
],
[
"Liberzon",
"Daniel",
""
]
] | [
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711.3526 | Kiyoshi Tamaki | Kiyoshi Tamaki | Unconditionally secure quantum key-distribution with relatively strong
signal pulse | 4 pages | Phys. Rev. A 77, 032341 (2008) | 10.1103/PhysRevA.77.032341 | null | quant-ph | null | We propose an unconditionally secure quantum key distribution (QKD) protocol,
which uses a relatively strong signal pulse. While our protocol shares similar
security bases as the Bennett 1992 protocol with a strong reference pulse
(B92), our scheme uses a smaller number of detectors and it is robust against
Rayleigh scattering in an optical fibre. We derive a lower bound of secret key
generation rate of our protocol and show that our protocol can cover relatively
long distances, assuming precise phase modulations and stable interferometers.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 09:13:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tamaki",
"Kiyoshi",
""
]
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711.3527 | Antonio Siber | Antonio Siber | Icosadeltahedral geometry of fullerenes, viruses and geodesic domes | null | null | null | null | physics.pop-ph cond-mat.soft physics.bio-ph q-bio.BM | null | I discuss the symmetry of fullerenes, viruses and geodesic domes within a
unified framework of icosadeltahedral representation of these objects. The
icosadeltahedral symmetry is explained in details by examination of all of
these structures. Using Euler's theorem on polyhedra, it is shown how to
calculate the number of vertices, edges, and faces in domes, and number of
atoms, bonds and pentagonal and hexagonal rings in fullerenes. Caspar-Klug
classification of viruses is elaborated as a specific case of icosadeltahedral
geometry.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 09:39:19 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Siber",
"Antonio",
""
]
] | [
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711.3528 | Jihn E. Kim | Ji-Haeng Huh, Jihn E. Kim, Jong-Chul Park, and Seong Chan Park | Galactic 511 keV line from MeV millicharged dark matter | 14 pages, 3 figures; To appear in Phys. Rev. D | Phys.Rev.D77:123503,2008 | 10.1103/PhysRevD.77.123503 | SNUTP 07-015 | astro-ph hep-ph | null | We present a possible explanation of the recently observed 511 keV
$\gamma$-ray anomaly with a new ``millicharged'' fermion. The new fermion is
light (${\cal O}({\rm MeV})$) but has never been observed by any collider
experiments mainly because of its tiny electromagnetic charge $\epsilon e$. We
show that constraints from its relic density in the Universe and collider
experiments allow a parameter range such that the 511 keV cosmic $\gamma$-ray
emission from the galactic bulge may be due to positron production from this
millicharged fermion.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 09:42:23 GMT"
},
{
"version": "v2",
"created": "Sat, 24 Nov 2007 02:01:11 GMT"
},
{
"version": "v3",
"created": "Sat, 1 Dec 2007 23:40:42 GMT"
},
{
"version": "v4",
"created": "Sun, 25 May 2008 05:29:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Huh",
"Ji-Haeng",
""
],
[
"Kim",
"Jihn E.",
""
],
[
"Park",
"Jong-Chul",
""
],
[
"Park",
"Seong Chan",
""
]
] | [
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] |
711.3529 | Hank Miller | R. C. Andrew and H. G. Miller | A short note on the presence of spurious states in finite basis
approximations | null | null | 10.1088/1751-8113/41/15/158001 | null | quant-ph math-ph math.MP | null | The genesis of spurious solutions in finite basis approximations to operators
which possess a continuum and a point spectrum is discussed and a simple
solution for identifying these solutions is suggested.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 10:06:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Andrew",
"R. C.",
""
],
[
"Miller",
"H. G.",
""
]
] | [
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] |
711.353 | Dmitrii Fil | D. V. Fil, S. I. Shevchenko | Bose-Einstein condensation in a decorated lattice: an application to
supersolid | 7 pages | Low Temp. Phys. 34, 351 (2008) | 10.1063/1.2911654 | null | cond-mat.stat-mech | null | The Bose-Einstein condensation of vacancies in a three-dimensional decorated
lattice is considered. The model describes possible scenario of superfluidity
of solid helium, caused by the presence of zero-point vacancies in a
dislocation network. It is shown that the temperature of Bose-Einstein
condensation decreases under increase of the length of the segments of the
network, and the law of decrease depends essentially on the properties of the
vertexes of the network. If the vertexes correspond to barriers with a small
transparency, the critical temperature is inversely as the square of the length
of the segment. On the contrary, if the vertexes correspond to traps for the
vacancies (it is energetically preferable for the vacancies to localize at the
vertexes), an exponential lowering of the temperature of transition takes
place. The highest temperature of Bose-Einstein condensation is reached in the
intermediate case of vertexes with large transparency, but in the absence of
tendency of localization in them. In the latter case the critical temperature
is inversely as the length of the segment.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 10:08:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fil",
"D. V.",
""
],
[
"Shevchenko",
"S. I.",
""
]
] | [
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] |
711.3531 | Andrzej Kup\'s\'c Dr | CELSIUS/WASA Collaboration: M. Ber{\l}owski, Chr. Bargholtz, M.
Bashkanov, D. Bogoslawsky, A. Bondar, H. Cal\'en, F. Cappellaro, H. Clement,
L. Demir\"ors, C. Ekstr\"om, K. Fransson, L. Ger\'en, L. Gustafsson, B.
H\"oistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, S. Keleta, I.
Koch, S. Kullander, A. Kup\'s\'c, A. Kuzmin, A. Kuznetsov, I.V. Laukhin, K.
Lindberg, P. Marciniewski, R. Meier, B. Morosov, W. Oelert, C. Pauly, H.
Pettersson, Y. Petukhov, A. Povtorejko, R.J.M.Y. Ruber, K. Sch\"onning, W.
Scobel, R. Shafigullin, B. Shwartz, T. Skorodko, V. Sopov, J. Stepaniak,
P.-E. Tegn\'er, P. Th\"orngren Engblom, V. Tikhomirov, A. Turowiecki, G.J.
Wagner, M. Wolke, A. Yamamoto, J. Zabierowski, I. Zartova, J. Z{\l}oma\'nczuk | Measurement of eta meson decays into lepton-antilepton pairs | 9 pages, 10 Postscript figures, uses revtex4.sty, revised version
after referee comments; conclusions unchanged | null | 10.1103/PhysRevD.77.032004 | null | hep-ex | null | A search for rare lepton decays of the eta meson was performed using the WASA
detector at CELSIUS. Two candidates for double Dalitz decay eta->e+e-e+e-
events are reported with a background of 1.3+/-0.2 events. This allows to set
an upper limit to the branching ratio of 9.7E-5 (90% CL). The branching ratio
for the decay eta->e+e-gamma is determined to (7.8+/-0.5 stat+/-0.8 syst)E-3.
An upper limit (90% CL) for the branching ratio for the eta->e+e- decay is
2.7E-5 and a limit for the sum of the eta->mu+mu-mu+mu- and eta->pi+pi-mu+mu-
decays is 3.6E-4.
| [
{
"version": "v1",
"created": "Fri, 23 Nov 2007 20:47:49 GMT"
},
{
"version": "v2",
"created": "Sat, 24 Nov 2007 17:53:38 GMT"
},
{
"version": "v3",
"created": "Wed, 16 Jan 2008 20:59:02 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"WASA Collaboration",
"",
""
],
[
"Berłowski",
"M.",
""
],
[
"Bargholtz",
"Chr.",
""
],
[
"Bashkanov",
"M.",
""
],
[
"Bogoslawsky",
"D.",
""
],
[
"Bondar",
"A.",
""
],
[
"Calén",
"H.",
""
],
[
"Cappellaro",
"F.",
""
],
[
"Clement",
"H.",
""
],
[
"Demirörs",
"L.",
""
],
[
"Ekström",
"C.",
""
],
[
"Fransson",
"K.",
""
],
[
"Gerén",
"L.",
""
],
[
"Gustafsson",
"L.",
""
],
[
"Höistad",
"B.",
""
],
[
"Ivanov",
"G.",
""
],
[
"Jacewicz",
"M.",
""
],
[
"Jiganov",
"E.",
""
],
[
"Johansson",
"T.",
""
],
[
"Keleta",
"S.",
""
],
[
"Koch",
"I.",
""
],
[
"Kullander",
"S.",
""
],
[
"Kupść",
"A.",
""
],
[
"Kuzmin",
"A.",
""
],
[
"Kuznetsov",
"A.",
""
],
[
"Laukhin",
"I. V.",
""
],
[
"Lindberg",
"K.",
""
],
[
"Marciniewski",
"P.",
""
],
[
"Meier",
"R.",
""
],
[
"Morosov",
"B.",
""
],
[
"Oelert",
"W.",
""
],
[
"Pauly",
"C.",
""
],
[
"Pettersson",
"H.",
""
],
[
"Petukhov",
"Y.",
""
],
[
"Povtorejko",
"A.",
""
],
[
"Ruber",
"R. J. M. Y.",
""
],
[
"Schönning",
"K.",
""
],
[
"Scobel",
"W.",
""
],
[
"Shafigullin",
"R.",
""
],
[
"Shwartz",
"B.",
""
],
[
"Skorodko",
"T.",
""
],
[
"Sopov",
"V.",
""
],
[
"Stepaniak",
"J.",
""
],
[
"Tegnér",
"P. -E.",
""
],
[
"Engblom",
"P. Thörngren",
""
],
[
"Tikhomirov",
"V.",
""
],
[
"Turowiecki",
"A.",
""
],
[
"Wagner",
"G. J.",
""
],
[
"Wolke",
"M.",
""
],
[
"Yamamoto",
"A.",
""
],
[
"Zabierowski",
"J.",
""
],
[
"Zartova",
"I.",
""
],
[
"Złomańczuk",
"J.",
""
]
] | [
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] |
711.3532 | Horatiu Stefan Nastase | Katsushi Ito, Horatiu Nastase and Koh Iwasaki | Gluon scattering in ${\cal N}=4$ Super Yang-Mills at finite temperature | 33 pages, 9 figures; clarifications of some points added, reference
added | Prog.Theor.Phys.120:99-128,2008 | 10.1143/PTP.120.99 | null | hep-th | null | We extend the AdS/CFT prescription of Alday and Maldacena to finite
temperature $T$, defining the amplitude for gluon scattering in ${\cal N}=4$
Super Yang-Mills at strong coupling from string theory. It is defined by a
lightlike ''Wilson loop'' living at the horizon of the T-dual to the black hole
in AdS space. Unlike the zero temperature case, this is different from the
Wilson loop contour defined at the boundary of the AdS black hole metric, thus
at finite $T$ there is no relation between gluon scattering amplitudes and the
Wilson loop. We calculate the amplitude at strong coupling for forward
scattering of a low energy gluon ($E<T$) off a high energy gluon ($E\gg T$) in
both cut-off and generalized dimensional regularization. The generalized
dimensional regularization is defined in string theory as an IR modified
dimensional reduction. For this calculation, the corresponding usual Wilson
loop is related to the jet quenching parameter of the finite temperature ${\cal
N}=4$ SYM plasma, while the gluon scattering amplitude is related to the
viscosity coefficient.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 10:16:59 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jan 2008 05:02:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ito",
"Katsushi",
""
],
[
"Nastase",
"Horatiu",
""
],
[
"Iwasaki",
"Koh",
""
]
] | [
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] |
711.3533 | Evelina Viada | Viada Evelina | Non-dense sets of subvarieties in a power of an elliptic curve | 34 pages | International Mathematics Reserch Notices, Vol 2009, n. 7,
1213-1246 | 10.1093/imrn/rnn157 | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let V be an algebraic variety embedded in a power of an elliptic curve, both
defined over the algebraic numbers. We show that the set of algebraic points of
V which are of bounded height and which satisfy certain algebraic conditions
are a non-dense subset of V. This result has implications in the context of the
Pink-Zilber Conjecture and Mordel-Lang plus Bogomolov Theorem.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 10:23:57 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Jan 2008 15:21:21 GMT"
},
{
"version": "v3",
"created": "Mon, 14 Jan 2008 13:22:46 GMT"
},
{
"version": "v4",
"created": "Mon, 10 Nov 2008 12:47:03 GMT"
},
{
"version": "v5",
"created": "Tue, 19 May 2009 12:56:59 GMT"
}
] | 2009-05-19T00:00:00 | [
[
"Evelina",
"Viada",
""
]
] | [
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711.3534 | Annalisa Calamida | A. Calamida, G. Bono (OAR/INAF), P. B. Stetson (HIA/NRC), L. M.
Freyhammer (Univ. Lancashire), S. Cassisi (OACTe/INAF), F. Grundahl (Aarhus
Univ.), A. Pietrinferni (OACTe/INAF), M. Hilker, F. Primas (ESO), T. Richtler
(Univ. Concepcion), M. Romaniello (ESO), R. Buonanno (Univ. Rome), F. Caputo,
M. Castellani, C. E. Corsi, I. Ferraro, G. Iannicola, L. Pulone (OAR/INAF) | Stroemgren metallicity calibration: the m1, b-y relation | 3 pages, 2 figures; to appear in Mem. Soc. Astr. Italiana, Vol. 79/2
(proceeding Cefalu' Workshop "XXI Century Challenges for Stellar Evolution",
ed. S. Cassisi & M. Salaris) | null | null | null | astro-ph | null | We performed a new calibration of the Stroemgren metallicity index m1 based
on the b-y color of cluster red giant stars. The current
Metallicity-Index-Color relation is not linear in the color range 0.40 < b-y <
1.0, but provides iron abundances of cluster and field red giants with an
accuracy of ~ 0.25 dex.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 10:24:15 GMT"
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] | 2007-11-26T00:00:00 | [
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"",
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711.3535 | Massimo Di Toro | M.Di Toro, M.Colonna, C.Rizzo, V.Baran | The Dynamical Dipole Radiation in Dissipative Collisions with Exotic
Beams | 10 pages, 6 figures, 14th Nuclear Physics Workshop, Kazimiers Dolny
Sept. 07, Int.Jou.Modern Physics (2008) to appear | Int.J.Mod.Phys.E17:110-119,2008 | 10.1142/S0218301308009604 | null | nucl-th | null | Heavy Ion Collisions (HIC) represent a unique tool to probe the in-medium
nuclear interaction in regions away from saturation. In this work we present a
selection of reaction observables in dissipative collisions particularly
sensitive to the isovector part of the interaction, i.e. to the symmetry term
of the nuclear Equation of State (EoS). At low energies the behavior of the
symmetry energy around saturation influences dissipation and fragment
production mechanisms. We will first discuss the recently observed Dynamical
Dipole Radiation, due to a collective neutron-proton oscillation during the
charge equilibration in fusion and deep-inelastic collisions. We will review in
detail all the main properties, yield, spectrum, damping and angular
distributions, revealing important isospin effects. Reactions induced by
unstable 132Sn beams appear to be very promising tools to test the
sub-saturation Isovector EoS. Predictions are also presented for deep-inelastic
and fragmentation collisions induced by neutron rich projectiles. The
importance of studying violent collisions with radioactive beams at low and
Fermi energies is finally stressed.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 10:24:59 GMT"
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] |
711.3536 | Juan Nieves Dr. | Hiroshi Toki, Carmen Garcia-Recio, Juan Nieves | Photon induced Lambda(1520) production and the role of the K^* exchange | 20 pages and 6 pages | Phys.Rev.D77:034001,2008 | 10.1103/PhysRevD.77.034001 | null | hep-ph | null | We study the photon induced Lambda(1520) production in the effective
Lagrangian method near threshold, E_\gamma^{LAB}<2 GeV, and in the quark-gluon
string model at higher energies 3 GeV < E_\gamma^{LAB} < 5 GeV. In particular,
we study the role of the K^* exchange for the production of Lambda(1520) within
the SU(6) Weinberg-Tomozowa chiral unitary model proposed in Phys. Rev. D74
(2006) 034025. The coupling of the Lambda(1520) resonance to the N \bar K^*
pair, which is dynamically generated, turns out to be relatively small and,
thus, the K exchange mechanism dominates the reaction. In the higher energy
region, where experimental data are available, the quark-gluon string mechanism
with the K Regge trajectory reproduces both the energy and the angular
distribution dependences of the Lambda(1520) photo-production reaction.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 10:34:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Toki",
"Hiroshi",
""
],
[
"Garcia-Recio",
"Carmen",
""
],
[
"Nieves",
"Juan",
""
]
] | [
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] |
711.3537 | Evelina Viada | Viada Evelina | The intersection of a curve with a union of translated codimension 2
subgroups in a power of an elliptic curve | 50 pages | Algebra and Number Theory, Vol.2, No 3, 2008, 249-298 | null | null | math.NT math.AG | null | Let C be an algebraic curve in a power of an elliptic curve, both defined
over the algebraic numbers. We show that the set of algebraic points of C which
satisfy certain conditions is a finite set. This result has implications with
the Pink-Zilber Conjeture and the Mordel-Lang plus Bogomolov Theorem for
curves.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 10:36:37 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Jan 2008 15:24:10 GMT"
},
{
"version": "v3",
"created": "Sat, 2 Feb 2008 17:58:43 GMT"
},
{
"version": "v4",
"created": "Tue, 3 Jun 2008 10:04:23 GMT"
}
] | 2008-11-10T00:00:00 | [
[
"Evelina",
"Viada",
""
]
] | [
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] |
711.3538 | Nakia Carlevaro | Nakia Carlevaro, Orchidea Maria Lecian, Giovanni Montani | Macroscopic and Microscopic Paradigms for the Torsion Field: from the
Test-Particle Motion to a Lorentz Gauge Theory | 15 pages, no figures, invited paper | Ann. Fond. L. de Broglie 32, 281-295 (2007) | null | null | gr-qc astro-ph hep-th | null | Torsion represents the most natural extension of General Relativity and it
attracted interest over the years in view of its link with fundamental
properties of particle motion. The bulk of the approaches concerning the
torsion dynamics focus their attention on their geometrical nature and they are
naturally led to formulate a non-propagating theory.
Here we review two different paradigms to describe the role of the torsion
field, as far as a propagating feature of the resulting dynamics is concerned.
However, these two proposals deal with different pictures, i.e., a macroscopic
approach, based on the construction of suitable potentials for the torsion
field, and a microscopic approach, which relies on the identification of
torsion with the gauge field associated with the local Lorentz symmetry. We
analyze in some detail both points of view and their implications on the
coupling between torsion and matter will be investigated. In particular, in the
macroscopic case, we analyze the test-particle motion to fix the physical
trajectory, while, in the microscopic approach, a natural coupling between
torsion and the spin momentum of matter fields arises.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 10:37:48 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Dec 2007 12:11:30 GMT"
}
] | 2009-03-24T00:00:00 | [
[
"Carlevaro",
"Nakia",
""
],
[
"Lecian",
"Orchidea Maria",
""
],
[
"Montani",
"Giovanni",
""
]
] | [
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711.3539 | Bilha Nissenson | Bilha Nissenson | Do Elementary Particles Have an Objective Existence? | 5 pages | null | null | null | quant-ph | null | The formulation of quantum theory does not comply with the notion of
objective existence of elementary particles. Objective existence independent of
observation implies the distinguishability of elementary particles. In other
words: If elementary particles have an objective existence independent of
observations, then they are distinguishable. Or if elementary particles are
indistinguishable then matter cannot have existence independent of our
observation. This paper presents a simple deduction of the above statements,
their compatibility with quantum theory, an example of quantum uniqueness
situation and a suggested experiment. The conclusion is a short discussion
about the redundancy of such phenomena.
| [
{
"version": "v1",
"created": "Fri, 23 Nov 2007 16:11:20 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Nissenson",
"Bilha",
""
]
] | [
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] |
711.354 | Richard de Grijs | Richard de Grijs (University of Sheffield, UK; NAOC Beijing, China) | Young massive star clusters: globular cluster progenitors? | 8 pages, review talk given at the meeting on "Young massive star
clusters - Initial conditions and environments", E. Perez, R. de Grijs, R. M.
Gonzalez Delgado, eds., Granada (Spain), September 2007, Springer: Dordrecht | null | null | null | astro-ph | null | I review the long-term survival chances of young massive star clusters
(YMCs), hallmarks of intense starburst episodes often associated with violent
galaxy interactions. In particular, I address the key question as to whether at
least some of these YMCs can be considered proto-globular clusters (GCs). In
the absence of significant external perturbations, the key factor determining a
cluster's long-term survival chances is the shape of its stellar initial mass
function. I conclude that there is an increasing body of evidence that GC
formation appears to be continuing until today; their long-term evolution
crucially depends on their environmental conditions, however.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 10:49:04 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"de Grijs",
"Richard",
"",
"University of Sheffield, UK; NAOC Beijing, China"
]
] | [
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] |
711.3541 | David Ridout | Pierre Mathieu and David Ridout | Logarithmic M(2,p) Minimal Models, their Logarithmic Couplings, and
Duality | 25 pages, 1 figure; v2 has several changes including more references
and a new appendix; v3 has only minor changes (NPB published version) | Nucl.Phys.B801:268-295,2008 | 10.1016/j.nuclphysb.2008.02.017 | null | hep-th | null | A natural construction of the logarithmic extension of the M(2,p) minimal
models is presented, which generalises our previous model [0708.0802] of
percolation (p=3). Its key aspect is the replacement of the minimal model
irreducible modules by reducible ones obtained by requiring that only one of
the two principal singular vectors of each module vanish. The resulting theory
is then constructed systematically by repeatedly fusing these building block
representations. This generates indecomposable representations of the type
which signify the presence of logarithmic partner fields in the theory. The
basic data characterising these indecomposable modules, the logarithmic
couplings, are computed for many special cases and given a new structural
interpretation. Quite remarkably, a number of them are presented in closed
analytic form (for general p). These are the prime examples of
``gauge-invariant'' data - quantities independent of the ambiguities present in
defining the logarithmic partner fields. Finally, mere global conformal
invariance is shown to enforce strong constraints on the allowed spectrum: It
is not possible to include modules other than those generated by the fusion of
the model's building blocks. This generalises the statement that there cannot
exist two effective central charges in a c=0 model. It also suggests the
existence of a second ``dual'' logarithmic theory for each p. Such dual models
are briefly discussed.
| [
{
"version": "v1",
"created": "Fri, 23 Nov 2007 13:09:44 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 15:55:14 GMT"
},
{
"version": "v3",
"created": "Wed, 19 Mar 2008 09:03:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mathieu",
"Pierre",
""
],
[
"Ridout",
"David",
""
]
] | [
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] |
711.3542 | Pablo D. Esquinazi | P. Esquinazi, N. Garc\'ia, J. Barzola-Quiquia, J.C. Gonz\'alez, M.
Mu\~noz, P. R\"odiger, K. Schindler, J.-L. Yao, M. Ziese | Intrinsic Superconductivity at 25 K in Highly Oriented Pyrolytic
Graphite | 5 pages, 3 figures | null | 10.1103/PhysRevB.78.134516 | null | cond-mat.supr-con cond-mat.str-el | null | High resolution magnetoresistance data in highly oriented pyrolytic graphite
thin samples manifest non-homogenous superconductivity with critical
temperature $T_c \sim 25 $K. These data exhibit: i) hysteretic loops of
resistance versus magnetic field similar to Josephson-coupled grains, ii)
quantum Andreev's resonances and iii) absence of the Schubnikov-de Haas
oscillations. The results indicate that graphite is a system with
non-percolative superconducting domains immersed in a semiconducting-like
matrix. As possible origin of the superconductivity in graphite we discuss
interior-gap superconductivity when two very different electronic masses are
present.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 10:55:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Esquinazi",
"P.",
""
],
[
"García",
"N.",
""
],
[
"Barzola-Quiquia",
"J.",
""
],
[
"González",
"J. C.",
""
],
[
"Muñoz",
"M.",
""
],
[
"Rödiger",
"P.",
""
],
[
"Schindler",
"K.",
""
],
[
"Yao",
"J. -L.",
""
],
[
"Ziese",
"M.",
""
]
] | [
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] |
711.3543 | Sergio Ciliberto | Pierre Jop (Phys-ENS), Sergio Ciliberto (Phys-ENS), Artem Petrosyan
(Phys-ENS) | Work and dissipation fluctuations near the stochastic resonance of a
colloidal particle | to be published in EPL | null | 10.1209/0295-5075/81/50005 | null | cond-mat.soft cond-mat.stat-mech | null | We study experimentally the fluctuations of the injected and dissipated
energy in a system of a colloidal particle trapped in a double well potential
periodically modulated by an external perturbation. The work done by the
external force and the dissipated energy are measured close to the stochastic
resonance where the injected power is maximum. We show that the steady state
fluctuation theorem holds in this system.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 10:55:15 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 07:30:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jop",
"Pierre",
"",
"Phys-ENS"
],
[
"Ciliberto",
"Sergio",
"",
"Phys-ENS"
],
[
"Petrosyan",
"Artem",
"",
"Phys-ENS"
]
] | [
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] |
711.3544 | Marcos Moshinsky | Marcos Moshinsky, Emerson Sadurni and Adolfo del Campo | Alternative Method for Determining the Feynman Propagator of a
Non-Relativistic Quantum Mechanical Problem | This is a contribution to the Proc. of the Seventh International
Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007,
Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry:
Methods and Applications) at http://www.emis.de/journals/SIGMA/ In v2
misprints are corrected | SIGMA 3 (2007), 110, 12 pages | 10.3842/SIGMA.2007.110 | null | quant-ph | null | A direct procedure for determining the propagator associated with a quantum
mechanical problem was given by the Path Integration Procedure of Feynman. The
Green function, which is the Fourier Transform with respect to the time
variable of the propagator, can be derived later. In our approach, with the
help of a Laplace transform, a direct way to get the energy dependent Green
function is presented, and the propagator can be obtained later with an inverse
Laplace transform. The method is illustrated through simple one dimensional
examples and for time independent potentials, though it can be generalized to
the derivation of more complicated propagators.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 11:08:44 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Dec 2007 21:18:50 GMT"
}
] | 2008-04-25T00:00:00 | [
[
"Moshinsky",
"Marcos",
""
],
[
"Sadurni",
"Emerson",
""
],
[
"del Campo",
"Adolfo",
""
]
] | [
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] |
711.3545 | Vasanthan Raghavan | Che Lin, Vasanthan Raghavan, Venu Veeravalli | To Code or Not to Code Across Time: Space-Time Coding with Feedback | 22 pages, 4 figures, Submitted to IEEE JSAC, Nov. 2007 | null | 10.1109/JSAC.2008.081024 | null | cs.IT math.IT | null | Space-time codes leverage the availability of multiple antennas to enhance
the reliability of communication over wireless channels. While space-time codes
have initially been designed with a focus on open-loop systems, recent
technological advances have enabled the possibility of low-rate feedback from
the receiver to the transmitter. The focus of this paper is on the implications
of this feedback in a single-user multi-antenna system with a general model for
spatial correlation. We assume a limited feedback model, that is, a coherent
receiver and statistics along with B bits of quantized channel information at
the transmitter. We study space-time coding with a family of linear dispersion
(LD) codes that meet an additional orthogonality constraint so as to ensure
low-complexity decoding. Our results show that, when the number of bits of
feedback (B) is small, a space-time coding scheme that is equivalent to
beamforming and does not code across time is optimal in a weak sense in that it
maximizes the average received SNR. As B increases, this weak optimality
transitions to optimality in a strong sense which is characterized by the
maximization of the average mutual information. Thus, from a system designer's
perspective, our work suggests that beamforming may not only be attractive from
a low-complexity viewpoint, but also from an information-theoretic viewpoint.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 11:10:00 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Lin",
"Che",
""
],
[
"Raghavan",
"Vasanthan",
""
],
[
"Veeravalli",
"Venu",
""
]
] | [
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] |
711.3546 | Massimo Di Toro | M.Di Toro, M.Colonna, V.Greco, G.Ferini, C.Rizzo, J.Rizzo, V.Baran,
T.Gaitanos, V.Prassa, H.H.Wolter, M.Zielinska-Pfabe | Constraining the Symmetry Energy: A Journey in the Isospin Physics from
Coulomb Barrier to Deconfinement | 15 pages, 5 figures, Int.Workshop on Nuclear Dynamics in Heavy Ion
Reactions and Neutron Stars, Beijing Normal Univ. July 07, to appear in
Int.Journ.Modern Physics E (2008) | Int.J.Mod.Phys.E17:1799-1814,2008 | 10.1142/S0218301308010799 | null | nucl-th | null | Heavy Ion Collisions (HIC) represent a unique tool to probe the in-medium
nuclear interaction in regions away from saturation. In this work we present a
selection of reaction observables in dissipative collisions particularly
sensitive to the isovector part of the interaction, i.e. to the symmetry term
of the nuclear Equation of State (EoS). At low energies the behavior of the
symmetry energy around saturation influences dissipation and fragment
production mechanisms. We will first discuss the recently observed Dynamical
Dipole Radiation, due to a collective neutron-proton oscillation during the
charge equilibration in fusion and deep-inelastic collisions. Important Iso-EOS
effects are stressed. Reactions induced by unstable 132Sn beams appear to be
very promising tools to test the sub-saturation Isovector EoS. New Isospin
sensitive observables are also presented for deep-inelastic, fragmentation
collisions and Isospin equilibration measurements (Imbalance Ratios). The high
density symmetry term can be derived from isospin effects on heavy ion
reactions at relativistic energies (few AGeV range), that can even allow a
``direct'' study of the covariant structure of the isovector interaction in the
hadron medium. Rather sensitive observables are proposed from collective flows
and from pion/kaon production. The possibility of the transition to a mixed
hadron-quark phase, at high baryon and isospin density, is finally suggested.
Some signatures could come from an expected ``neutron trapping'' effect. The
importance of studying violent collisions with radioactive beams from low to
relativistic energies is finally stressed.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 11:13:39 GMT"
}
] | 2008-12-25T00:00:00 | [
[
"Di Toro",
"M.",
""
],
[
"Colonna",
"M.",
""
],
[
"Greco",
"V.",
""
],
[
"Ferini",
"G.",
""
],
[
"Rizzo",
"C.",
""
],
[
"Rizzo",
"J.",
""
],
[
"Baran",
"V.",
""
],
[
"Gaitanos",
"T.",
""
],
[
"Prassa",
"V.",
""
],
[
"Wolter",
"H. H.",
""
],
[
"Zielinska-Pfabe",
"M.",
""
]
] | [
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] |
711.3547 | Sergey Maleyev V. | S. V. Maleyev | Comment on "Theory of helimagnons in itinerant quantum systems" by
D.Belitz, T.K.Kirpatrick and A.Rosch and "Cubic magnets with
Dzyaloshinskii-Moriya interaction at low temperatures" by S.V.Maleyev | null | null | null | null | cond-mat.str-el | null | Comment on "Theory of helimagnons in itinerant quantum systems" by D.Belitz,
T.K.Kirpatrick and A.Rosch and "Cubic magnets with Dzyaloshinskii-Moriya
interaction at low temperatures" by S.V.Maleyev
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 11:30:25 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Maleyev",
"S. V.",
""
]
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711.3548 | Atsushi Ito | Atsushi Ito and Hiroaki Nakamura | Molecular Dynamics Simulation of Plasma Surface Interaction | 21 pages, 20078 US-Japan workshop, in TEXAS, U.S | null | null | null | cond-mat.mtrl-sci cond-mat.other | null | New interlayer intermolecular potential model was proposed and it represented
``ABAB'' staking of graphite. Hydrogen atom sputtering on graphite surface was
investigated using molecular dynamics simulation. In the initial short time
period, maintaining the flat structure of graphenes, hydrogen atoms brought
about the difference interaction process in each incident energy. The first
graphene often adsorbed 5 eV hydrogen atoms and reflected almost all of 15 eV
hydrogen atoms. The hydrogen atoms which were injected at 30 eV penetrated into
the inside of the graphite surface and were adsorbed between interlayer. The
desorption of C2H2 on the clear graphite surface was observed in only the case
incident at 5 eV. The animation of the MD simulation and radial distribution
function indicated that the graphenes were peeled off one by one at regular
interval. In common to the incident energy, the yielded molecules often had
chain structures terminated by hydrogen atoms. The erosion yield increased
compared with the case of no interlayer intermolecular force.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:42:33 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Ito",
"Atsushi",
""
],
[
"Nakamura",
"Hiroaki",
""
]
] | [
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711.3549 | Vsevolod Katkov | V.L. Katkov and V.A. Osipov | Effect of band structure on field emission of crystalline graphite | 15 pages, 12 figures. To be published in Journal of Physics:
Condensed Matter | J. Phys.:Condens.Matter, vol. 20, p. 035204 (2008) | 10.1088/0953-8984/20/03/035204 | null | cond-mat.other | null | The field emission of crystalline AAA graphite is studied within a simple
analytical approach with account of the exact dispersion relation near the
Fermi level. The emission current is calculated for two crystal orientations
with respect to the applied electric field. It is found that the exponent of
the Fowler-Nordheim equation remains the same while the preexponential factor
is markedly modified. For both field directions, the linear field dependence is
found in weak fields and the standard quadratic Fowler-Nordheim behavior takes
place in strong fields. A strong dependence of the emission current from the
interlayer distance is observed. As an illustration of the method the known
case of a single-walled carbon nanotube is considered.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 11:37:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Katkov",
"V. L.",
""
],
[
"Osipov",
"V. A.",
""
]
] | [
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] |
711.355 | Christoph Adam | C. Adam, N. Grandi, J. Sanchez-Guillen, A. Wereszczynski | K fields, compactons, and thick branes | some references and further remarks added | J.Phys.A41:212004,2008 | 10.1088/1751-8113/41/21/212004 | null | hep-th gr-qc | null | K fields, that is, fields with a non-standard kinetic term, allow for soliton
solutions with compact support, i.e., compactons. Compactons in 1+1 dimensions
may give rise to topological defects of the domain wall type and with finite
thickness in higher dimensions. Here we demonstrate that, for an appropriately
chosen kinetic term, propagation of linear perturbations is completely
suppressed outside the topological defect, confining the propagation of
particles inside the domain wall. On the other hand, inside the topological
defect the propagation of linear perturbations is of the standard type, in
spite of the non-standard kinetic term. Consequently, this compacton domain
wall may act like a brane of finite thickness which is embedded in a higher
dimensional space, but to which matter fields are constrained. In addition, we
find strong indications that, when gravity is taken into account, location of
gravity in the sense of Randall--Sundrum works for these compacton domain
walls. When seen from the bulk, these finite thickness branes, in fact, cannot
be distinguished from infinitely thin branes.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 12:11:49 GMT"
},
{
"version": "v2",
"created": "Wed, 2 Apr 2008 17:08:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Adam",
"C.",
""
],
[
"Grandi",
"N.",
""
],
[
"Sanchez-Guillen",
"J.",
""
],
[
"Wereszczynski",
"A.",
""
]
] | [
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] |
711.3551 | Sergej Flach | S. Flach, M. V. Ivanchenko, O. I. Kanakov and K. G. Mishagin | Periodic orbits, localization in normal mode space, and the
Fermi-Pasta-Ulam problem | 19 pages, 9 figures, to appear in Am. J. Phys | null | 10.1119/1.2820396 | null | nlin.PS | null | The Fermi-Pasta-Ulam problem was one of the first computational experiments.
It has stirred the physics community since, and resisted a simple solution for
half a century. The combination of straightforward simulations, efficient
computational schemes for finding periodic orbits, and analytical estimates
allows us to achieve significant progress. Recent results on $q$-breathers,
which are time-periodic solutions that are localized in the space of normal
modes of a lattice and maximize the energy at a certain mode number, are
discussed, together with their relation to the Fermi-Pasta-Ulam problem. The
localization properties of a $q$-breather are characterized by intensive
parameters, that is, energy densities and wave numbers. By using scaling
arguments, $q$-breather solutions are constructed in systems of arbitrarily
large size. Frequency resonances in certain regions of wave number space lead
to the complete delocalization of $q$-breathers. The relation of these features
to the Fermi-Pasta-Ulam problem are discussed.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 12:00:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Flach",
"S.",
""
],
[
"Ivanchenko",
"M. V.",
""
],
[
"Kanakov",
"O. I.",
""
],
[
"Mishagin",
"K. G.",
""
]
] | [
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] |
711.3552 | Massimo Pica Ciamarra | Massimo Pica Ciamarra | Comment on ``Granular Entropy: Explicit Calculations for Planar
Assemblies'' | null | Phys. Rev. Lett. 99, 089401 (2007) | 10.1103/PhysRevLett.99.089401 | null | cond-mat.soft cond-mat.stat-mech | null | A Comment on the Letter by Raphael Blumenfeld and Sam F. Edwards, [Phys. Rev.
Lett. 90, 114303 (2003)].
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 12:01:23 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Ciamarra",
"Massimo Pica",
""
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711.3553 | Charles Torossian | Charles Torossian (IMJ) | Applications de la bi-quantification \`a la th\'eorie de Lie | Large English Introduction | null | null | null | math.QA math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article is a survey about applications of bi-quantization theory in Lie
theory. We focus on a conjecture of M. Duflo. Most of the applications are
coming from our article with Alberto Cattaneo and some extensions are relating
discussions with my student. The end of the article is completely new. We prove
that the conjecture E=1 implies the Kashiwara-Vergne conjecture. Our
deformation is non geometric but uses a polynomial deformation of the
coefficients.
| [
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711.3554 | Massimo Di Toro | M.Di Toro | Heavy Ion Dynamics and Neutron Stars | 11 pages, no figures, Summary Talk, Int.Workshop on "Nuclear Dynamics
in Heavy Ion Collisions and Neutron Stars", Beijing Normal Univ. July 07, to
appear in Int.Journ.Modern Physics E (2008) | Int.J.Mod.Phys.E17:1989-1999,2008 | 10.1142/S0218301308010969 | null | nucl-th | null | Some considerations are reported, freely inspired from the presentations and
discussions during the Beijing Normal University Workshop on the above Subject,
held in July 2007. Of course this cannot be a complete summary but just a
collection of personal thougths aroused during the meeting.
| [
{
"version": "v1",
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""
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711.3555 | Jian Hu | Jian Hu, Yu-Qing Lou | Collisional interaction limits between dark matters and baryons in
`cooling flow' clusters | 8 pages, 2 figures, MNRAS accepted | null | 10.1111/j.1365-2966.2007.12755.x | null | astro-ph | null | Presuming weak collisional interactions to exchange the kinetic energy
between dark matter and baryonic matter in a galaxy cluster, we re-examine the
effectiveness of this process in several `cooling flow' galaxy clusters using
available X-ray observations and infer an upper limit on the heavy dark matter
particle (DMP)$-$proton cross section $\sigma_{\rm xp}$. With a relative
collisional velocity $V-$dependent power-law form of $\sigma_{\rm
xp}=\sigma_0(V/10^3 {\rm km s^{-1}})^a$ where $a\leq 0$, our inferred upper
limit is $\sigma_0/m_{\rm x}\lsim 2\times10^{-25} {\rm cm}^2 {\rm GeV}^{-1}$
with $m_{\rm x}$ being the DMP mass. Based on a simple stability analysis of
the thermal energy balance equation, we argue that the mechanism of
DMP$-$baryon collisional interactions is unlikely to be a stable
nongravitational heating source of intracluster medium (ICM) in inner core
regions of `cooling flow' galaxy clusters.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 12:43:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hu",
"Jian",
""
],
[
"Lou",
"Yu-Qing",
""
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711.3556 | Manuel Perucho Pla | M. Perucho and V. Bosch-Ramon | Studying the interaction between microquasar jets and their environments | 4 pages. Contribution to the proceedings of High Energy Phenomena in
Relativistic Outflows, held in Dublin, Ireland, September 24-28, 2007 | Int.J.Mod.Phys.D17:1939-1945,2008 | 10.1142/S0218271808013601 | null | astro-ph | null | In high-mass microquasars (HMMQ), strong interactions between jets and
stellar winds at binary system scales could occur. In order to explore this
possibility, we have performed numerical 2-dimensional simulations of jets
crossing the dense stellar material to study how the jet will be affected by
these interactions. We find that the jet head generates strong shocks in the
wind. These shocks reduce the jet advance speed, and compress and heat up jet
and wind material. In addition, strong recollimation shocks can occur where
pressure balance between the jet side and the surrounding medium is reached.
All this, altogether with jet bending, could lead to the destruction of jets
with power $<10^{36} \rm{erg/s}$. The conditions around the outflow shocks
would be convenient for accelerating particles up to $\sim $TeV energies. These
accelerated particles could emit via synchrotron and inverse Compton (IC)
scattering if they were leptons, and via hadronic processes in case they were
hadrons.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 12:51:21 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Perucho",
"M.",
""
],
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"Bosch-Ramon",
"V.",
""
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711.3557 | Roman Romanov | Roman Romanov | Notions of absolutely continuous subspace for nonselfadjoint operators | 13 pages; a counterexample to the duality problem for spectral
components has been added | null | null | null | math.FA math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give an example of an operator with different weak and strong absolutely
continuous subspaces, and a counterexample to the duality problem for the
spectral components. Both examples are optimal in the scale of compact
operators.
| [
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"version": "v1",
"created": "Thu, 22 Nov 2007 12:54:11 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Jun 2008 05:44:18 GMT"
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] | 2008-06-11T00:00:00 | [
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"Roman",
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711.3558 | Hiroo Azuma | Hiroo Azuma | Dynamics of Bloch vector in thermal Jaynes-Cummings model | 16 pages, 8 eps figures, latex2e; v2: a new section and references
added | Phys. Rev. A 77, 063820 (2008) | 10.1103/PhysRevA.77.063820 | null | quant-ph | null | In this paper, we investigate the dynamics of the Bloch vector of a single
two-level atom which interacts with a single quantized electromagnetic field
mode according to the Jaynes-Cummings model, where the field is initially
prepared in a thermal state. The time evolution of the Bloch vector S(t) seems
to be in complete disorder because of the thermal distribution of the initial
state of the field. Both the norm and the direction of S(t) oscillate hard and
their periods seem infinite. We observe that the trajectory of the time
evolution of S(t) in the two- or three-dimensional space does not form a closed
path. To remove the fast frequency oscillation from the trajectory, we take the
time-average of the Bloch vector S(t). We examine the histogram of
{S_{z}(n\Delta t)|n=0,1,...,N} for small \Delta t and large N. It represents an
absolute value of a derivative of the inverse function of S_{z}(t). (When the
inverse function of y=S_{z}(t) is a multi-valued function, the histogram
represents a summation of the absolute values of its derivatives at points
whose real parts are equal to y on the Riemann surface.) We examine the
dependence of the variance of the histogram on the temperature of the field. We
estimate the lower bound of the entanglement between the atom and the field.
| [
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"created": "Fri, 23 Nov 2007 00:56:53 GMT"
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{
"version": "v2",
"created": "Tue, 15 Apr 2008 21:00:38 GMT"
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] |
711.3559 | Cyril Proust | C. Jaudet, D. Vignolles, A. Audouard, J. Levallois, D. LeBoeuf, N.
Doiron-Leyraud, B. Vignolle, M. Nardone, A. Zitouni, R. Liang, D.A. Bonn,
W.N. Hardy, L. Taillefer, and C. Proust | de Haas-van Alphen oscillations in the underdoped cuprate
YBa$_2$Cu$_3$O$_{6.5}$ | published version | Phys. Rev. Lett. 100, 187005 (2008) | 10.1103/PhysRevLett.100.187005 | null | cond-mat.supr-con cond-mat.str-el | null | The de Haas-van Alphen effect was observed in the underdoped cuprate
YBa$_2$Cu$_3$O$_{6.5}$ via a torque technique in pulsed magnetic fields up to
59 T. Above an irreversibility field of $\sim$30 T, the magnetization exhibits
clear quantum oscillations with a single frequency of 540 T and a cyclotron
mass of 1.76 times the free electron mass, in excellent agreement with
previously observed Shubnikov-de Haas oscillations. The oscillations obey the
standard Lifshitz-Kosevich formula of Fermi-liquid theory. This thermodynamic
observation of quantum oscillations confirms the existence of a well-defined,
close and coherent, Fermi surface in the pseudogap phase of cuprates.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 12:57:39 GMT"
},
{
"version": "v2",
"created": "Tue, 13 May 2008 07:55:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jaudet",
"C.",
""
],
[
"Vignolles",
"D.",
""
],
[
"Audouard",
"A.",
""
],
[
"Levallois",
"J.",
""
],
[
"LeBoeuf",
"D.",
""
],
[
"Doiron-Leyraud",
"N.",
""
],
[
"Vignolle",
"B.",
""
],
[
"Nardone",
"M.",
""
],
[
"Zitouni",
"A.",
""
],
[
"Liang",
"R.",
""
],
[
"Bonn",
"D. A.",
""
],
[
"Hardy",
"W. N.",
""
],
[
"Taillefer",
"L.",
""
],
[
"Proust",
"C.",
""
]
] | [
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] |
711.356 | Andrew Christianson | A.D. Christianson, M.D. Lumsden, M. Angst, Z. Yamani, W. Tian, R. Jin,
E.A. Payzant, S.E. Nagler, B.C. Sales, and D. Mandrus | Three Dimensional Magnetic Correlations in Multiferroic LuFe2O4 | 4 figures | Phys. Rev. Lett. 100, 107601 (2008) | 10.1103/PhysRevLett.100.107601 | null | cond-mat.str-el | null | We present single-crystal neutron diffraction measurements on multiferroic
LuFe2O4 showing phase transitions at 240 and 175 K. Magnetic reflections are
observed below each transition indicating that the magnetic interactions in
LuFe2O4 are 3-dimensional (3D) in character. The magnetic structure is refined
as a ferrimagnetic spin configuration below the 240 K transition. While 3D
magnetic correlations persists below 175 K, a significant broadening of the
magnetic peaks is observed along with the build up of a diffuse component to
the magnetic scattering.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:00:27 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Mar 2008 21:41:45 GMT"
},
{
"version": "v3",
"created": "Wed, 19 Mar 2008 02:12:25 GMT"
},
{
"version": "v4",
"created": "Wed, 19 Mar 2008 21:25:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Christianson",
"A. D.",
""
],
[
"Lumsden",
"M. D.",
""
],
[
"Angst",
"M.",
""
],
[
"Yamani",
"Z.",
""
],
[
"Tian",
"W.",
""
],
[
"Jin",
"R.",
""
],
[
"Payzant",
"E. A.",
""
],
[
"Nagler",
"S. E.",
""
],
[
"Sales",
"B. C.",
""
],
[
"Mandrus",
"D.",
""
]
] | [
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] |
711.3561 | Andre Sopczak | Andre Sopczak (Lancaster University, UK; on behalf of the LCFI
Collaboration) | Radiation Hardness Studies in a CCD with High-Speed Column Parallel
Readout | 3 pages, 6 figures; presented at IEEE'07, ALCPG'07, ICATPP'07 | JINST3:P05007,2008 | 10.1088/1748-0221/3/05/P05007 | null | physics.ins-det | null | Charge Coupled Devices (CCDs) have been successfully used in several high
energy physics experiments over the past two decades. Their high spatial
resolution and thin sensitive layers make them an excellent tool for studying
short-lived particles. The Linear Collider Flavour Identification (LCFI)
collaboration is developing Column-Parallel CCDs (CPCCDs) for the vertex
detector of the International Linear Collider (ILC). The CPCCDs can be read out
many times faster than standard CCDs, significantly increasing their operating
speed. The results of detailed simulations of the charge transfer inefficiency
(CTI) of a prototype CPCCD are reported and studies of the influence of gate
voltage on the CTI described. The effects of bulk radiation damage on the CTI
of a CPCCD are studied by simulating the effects of two electron trap levels,
0.17 and 0.44 eV, at different concentrations and operating temperatures. The
dependence of the CTI on different occupancy levels (percentage of hit pixels)
and readout frequencies is also studied. The optimal operating temperature for
the CPCCD, where the effects of the charge trapping are at a minimum, is found
to be about 230 K for the range of readout speeds proposed for the ILC. The
results of the full simulation have been compared with a simple analytic model.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:03:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sopczak",
"Andre",
"",
"Lancaster University, UK; on behalf of the LCFI\n Collaboration"
]
] | [
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] |
711.3562 | Franck Laloe | Franck Lalo\"e (LKB - Lhomond), William J. Mullin (UMASS) | EPR argument and Bell inequalities for Bose-Einstein spin condensates | a few misprints corrected, a reference added. This is the published
version | Physical Review A: Atomic, Molecular and Optical Physics 77 (2008)
022108 | 10.1103/PhysRevA.77.022108 | null | quant-ph cond-mat.other | null | We discuss the properties of two Bose-Einstein condensates in different spin
states, represented quantum mechanically by a double Fock state. Individual
measurements of the spins of the particles are performed in transverse
directions (perpendicular to the spin quantization axis), giving access to the
relative phase of the two macroscopically occupied states. Before the first
spin measurement, the phase is completely undetermined; after a few
measurements, a more and more precise knowledge of its value emerges under the
effect of the quantum measurement process. This naturally leads to the usual
notion of a quasi-classical phase (Anderson phase) and to an interesting
transposition of the EPR (Einstein-Podolsky-Rosen) argument to macroscopic
physical quantities. The purpose of this article is to discuss this
transposition, as well as situations where the notion of a quasi-classical
phase is no longer sufficient to account for the quantum results, and where
significant violations of Bell type inequalities are predicted.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:17:34 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Feb 2008 07:29:18 GMT"
}
] | 2008-02-18T00:00:00 | [
[
"Laloë",
"Franck",
"",
"LKB - Lhomond"
],
[
"Mullin",
"William J.",
"",
"UMASS"
]
] | [
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] |
711.3563 | Bernardo Nunes Borges de Lima | J. van den Berg, B.N.B. de Lima | Linear Lower Bounds for $\delta_c(p)$ for a Class of 2D Self-Destructive
Percolation Models | null | null | null | null | math.PR math-ph math.MP | null | The self-destructive percolation model is defined as follows: Consider
percolation with parameter $p > p_c$. Remove the infinite occupied cluster.
Finally, give each vertex (or, for bond percolation, each edge) that at this
stage is vacant, an extra chance $\delta$ to become occupied. Let $\delta_c(p)$
be the minimal value of $\delta$, needed to obtain an infinite occupied cluster
in the final configuration. This model was introduced some years ago by van den
Berg and Brouwer. They showed that, for the site model on the square lattice
(and a few other 2D lattices satisfying a special technical condition) that
$\delta_c(p)\geq\frac{(p-p_c)}{p}$. In particular, $\delta_c(p)$ is at least
linear in $p-p_c$.
Although the arguments used by van den Berg and Brouwer look quite rigid, we
show that they can be suitably modified to obtain similar linear lower bounds
for $\delta_c(p)$ (with $p$ near $p_c$) for a much larger class of 2D lattices,
including bond percolation on the square and triangular lattices, and site
percolation on the star lattice (or matching lattice) of the square lattice.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:17:50 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Berg",
"J. van den",
""
],
[
"de Lima",
"B. N. B.",
""
]
] | [
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] |
711.3564 | Andrei Sokolov | A.Sokolov and T.Cawthorne | Phase-referencing on BL Lac | 5 pages, 7 figures | null | null | null | astro-ph | null | We report the results of a phase-referencing study aimed at uncovering
precession of the VLBI jet of BL Lac. The observations were conducted at 8, 15,
22, and 43 GHz and consist of seven epochs spanning about two years. We
investigated the change in the absolute position of BL Lac's radio core by
means of phase-referencing with two nearby sources, 2151+431 and 2207+374. The
shift in the position of the core perpendicular to the jet is a signature of
precession. However, the periodic variations with an amplitude of ~0.15 mas and
a period of 1 year can be attributed to seasonal weather variations. We also
detect a trend in position of the core on the scale of ~0.1 mas over two years.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:21:15 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Sokolov",
"A.",
""
],
[
"Cawthorne",
"T.",
""
]
] | [
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] |
711.3565 | David Nutter | D. Nutter, J. M. Kirk, D. Stamatellos and D. Ward-Thompson | SCUBA and Spitzer observations of the Taurus molecular cloud - pulling
the bull's tail | 10 pages, 9 Figures, Accepted by MNRAS | null | 10.1111/j.1365-2966.2007.12750.x | null | astro-ph | null | We present continuum data from the Submillimetre Common-User Bolometer Array
(SCUBA) on the James Clerk Maxwell Telescope (JCMT), and the Mid-Infrared
Photometer for Spitzer (MIPS) on the Spitzer Space Telescope, at submillimetre
and infrared wavelengths respectively. We study the Taurus molecular cloud 1
(TMC1), and in particular the region of the Taurus Molecular Ring (TMR). In the
continuum data we see no real evidence for a ring, but rather we see one side
of it only, appearing as a filament. We name the filament `the bull's tail'.
The filament is seen in emission at 850, 450 and 160um, and in absorption at
70um. We compare the data with archive data from the Infra-Red Astronomical
Satellite (IRAS) at 12, 25, 60, 100um, in which the filament is also seen in
absorption. We find that the emission from the filament consists of two
components: a narrow, cold (~8K), central core; and a broader, slightly warmer
(~12K), shoulder of emission. We use a radiative transfer code to model the
filament's appearance, either in emission or absorption, simultaneously at each
of the different wavelengths. Our best fit model uses a Plummer-like density
profile and a homogeneous interstellar dust grain population. Unlike previous
work on a similar, but different filament in Taurus, we require no grain
coagulation to explain our data.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:24:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nutter",
"D.",
""
],
[
"Kirk",
"J. M.",
""
],
[
"Stamatellos",
"D.",
""
],
[
"Ward-Thompson",
"D.",
""
]
] | [
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] |
711.3566 | Piotr Stefanski | Piotr Stefanski | Proposal for a correlation induced spin-current polarizer | 5 pages, 4 figures, title changed, rearranged figures, one reference
added, discussion extension, accepted for Phys. Rev. B | Phys. Rev. B 77, 125331 (2008) | 10.1103/PhysRevB.77.125331 | null | cond-mat.mes-hall | null | We propose a spin polarizer device composed of a quantum dot connected to the
spin polarized leads. The spin control of the current flowing through the
device is entirely due to the Coulomb interactions present inside the dot. We
show that the initial polarization present in the source lead can be reverted
or suppressed just by manipulating the gate voltage acting on the dot, the
presence of the external magnetic field is not required. The influence of the
temperature and finite bias on the efficiency of the current spin switching
effect is also discussed.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:28:34 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Mar 2008 09:20:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stefanski",
"Piotr",
""
]
] | [
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] |
711.3567 | Sebastian Loth | S. Loth, M. Wenderoth, R. G. Ulbrich | Influence of surface-related strain and electric field on acceptor wave
functions in Zincblende semiconductors | 8 pages, 4 figures | null | 10.1103/PhysRevB.77.115344 | null | cond-mat.mes-hall cond-mat.dis-nn | null | The spatial distribution of the local density of states (LDOS) at Mn
acceptors near the (110) surface of p-doped InAs is investigated by Scanning
Tunneling Microscopy (STM). The shapes of the acceptor contrasts for different
dopant depths under the surface are analyzed. Acceptors located within the
first ten subsurface layers of the semiconductor show a lower symmetry than
expected from theoretical predictions of the bulk acceptor wave function. They
exhibit a (001) mirror asymmetry. The degree of asymmetry depends on the
acceptor atoms' depths. The measured contrasts for acceptors buried below the
10th subsurface layer closely match the theoretically derived shape. Two
effects are able to explain the symmetry reduction: the strain field of the
surface relaxation and the tip-induced electric field.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:28:47 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Loth",
"S.",
""
],
[
"Wenderoth",
"M.",
""
],
[
"Ulbrich",
"R. G.",
""
]
] | [
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711.3568 | Ezio Vasselli | Ezio Vasselli | Bundles of C*-algebras and the KK(X;-,-)-bifunctor | 16 pages; uses xy.sty | Proc. Conf. C*-algebras and elliptic theory, Trends in Mathematics
(2006) 313-327 | null | null | math.KT math.OA | null | An overview about C*-algebra bundles with a Z-grading is presented, with
particular emphasis on classification questions. In particular, we discuss the
role of the representable KK(X ; -, -)-bifunctor introduced by Kasparov. As an
application, we consider Cuntz-Pimsner algebras associated with vector bundles,
and give a classification in terms of K-theoretical invariants in the case in
which the base space is an n-sphere.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:30:52 GMT"
}
] | 2011-11-21T00:00:00 | [
[
"Vasselli",
"Ezio",
""
]
] | [
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] |
711.3569 | Cosimo Bambi | C. Bambi, A. Drago | Constraints on temporal variation of fundamental constants from GRBs | 5 pages, no figure. v3: refereed version | Astropart.Phys.29:223-227,2008 | 10.1016/j.astropartphys.2008.02.001 | WSU-HEP-0710 | hep-ph astro-ph | null | The formation of a strange or hybrid star from a neutron star progenitor is
believed to occur when the central stellar density exceeds a critical value. If
the transition from hadron to quark matter is of first order, the event has to
release a huge amount of energy in a very short time and we would be able to
observe the phenomenon even if it is at cosmological distance far from us; most
likely, such violent quark deconfinement would be associated with at least a
fraction of the observed gamma ray bursts. If we allow for temporal variations
of fundamental constants like $\Lambda_{QCD}$ or $G_N$, we can expect that
neutron stars with an initial central density just below the critical value can
enter into the region where strange or hybrid stars are the true ground state.
From the observed rate of long gamma ray bursts, we are able to deduce the
constraint $\dot{G}_N/G_N \lesssim 10^{-17} {\rm yr^{-1}}$, which is about 5
orders of magnitude more stringent than the strongest previous bounds on a
possible increasing $G_N$.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:32:43 GMT"
},
{
"version": "v2",
"created": "Thu, 29 Nov 2007 23:44:53 GMT"
},
{
"version": "v3",
"created": "Tue, 5 Feb 2008 13:34:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bambi",
"C.",
""
],
[
"Drago",
"A.",
""
]
] | [
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] |
711.357 | Mark Perel'man | Mark E. Perel'man, Vitali A. Tatartchenko | Phase Transitions of the First Kind as Radiation Processes | 17 pages | null | 10.1016/j.physleta.2007.11.056 | null | physics.optics physics.gen-ph | null | Crystallization and vapor condensation are considered as processes of
sequential entering of single atoms/molecules into condensate. The latent heat
can be carry away by radiation of characteristic frequencies generated in the
course of transition. The estimated dependences of latent (radiated) energy of
boiling on temperature confirm and prove the well-known empirical Trouton's
rule applicable to many simple substances. It leads to the estimation of
interrelation of critical parameters of corresponding substances. Experimental
results of the authors and other researchers concerning crystallization from
the melt of different substances (alkali halides, sapphire, tellurium, ice,
copper) are presented, as well as condensation of water vapor, the
correspondence to the offered model is established. It allows developing of the
spectroscopy of phase transitions, and can lead to control of crystallization
process, to crystallization stimulated by the characteristic radiation, etc.
Formation of clouds in our atmosphere should be accompanied by characteristic
radiation detectable for meteorological warnings.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:34:53 GMT"
},
{
"version": "v2",
"created": "Sat, 19 Jan 2008 12:58:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Perel'man",
"Mark E.",
""
],
[
"Tatartchenko",
"Vitali A.",
""
]
] | [
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] |
711.3571 | Daniel Lacour | M. Hehn (LPM), Daniel Lacour (LPM), F. Montaigne (LPM), J. Briones
(LPM), R. Belkhou (SSOLEIL), S. El Moussaoui (SSOLEIL), F. Maccherozzi
(SSOLEIL), N. Rougemaille (NEEL) | 360 degree domain wall generation in the soft layer of magnetic tunnel
junctions | null | Applied Physics Letters 92 (2008) 072501 | 10.1063/1.2838455 | null | cond-mat.mtrl-sci | null | High spatial resolution X-ray photo-emission electron microscopy technique
has been used to study the influence of the dipolar coupling taking place
between the NiFe and the Co ferromagnetic electrodes of micron sized,
elliptical shaped magnetic tunnel junctions. The chemical selectivity of this
technique allows to observe independently the magnetic domain structure in each
ferromagnetic electrode. The combination of this powerful imaging technique
with micromagnetic simulations allows to evidence that a 360 degree domain wall
can be stabilized in the NiFe soft layer. In this letter, we discuss the origin
and the formation conditions of those 360 degree domain walls evidenced
experimentally and numerically.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:40:15 GMT"
}
] | 2008-04-02T00:00:00 | [
[
"Hehn",
"M.",
"",
"LPM"
],
[
"Lacour",
"Daniel",
"",
"LPM"
],
[
"Montaigne",
"F.",
"",
"LPM"
],
[
"Briones",
"J.",
"",
"LPM"
],
[
"Belkhou",
"R.",
"",
"SSOLEIL"
],
[
"Moussaoui",
"S. El",
"",
"SSOLEIL"
],
[
"Maccherozzi",
"F.",
"",
"SSOLEIL"
],
[
"Rougemaille",
"N.",
"",
"NEEL"
]
] | [
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] |
711.3572 | Tam\'as K\'alm\'an | Tam\'as K\'alm\'an | Rulings of Legendrian knots as spanning surfaces | 9 pages | null | null | null | math.GT math.SG | null | Each ruling of a Legendrian link can be naturally treated as a surface. For
knots, the ruling is 2-graded if and only if the surface is orientable. For
2-graded rulings of homogeneous (in particular, alternating) knots, we prove
that the genus of this surface is at most the genus of the knot. While this is
not true in general, we do prove that the canonical genus (a.k.a. diagram
genus) of any knot is an upper bound for the genera of its 2-graded rulings.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:41:01 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Kálmán",
"Tamás",
""
]
] | [
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711.3573 | Alejandra Kandus | Alejandra Kandus (UESC-Brazil) and Christos G. Tsagas (AUTH-Greece) | Generalized Ohm's law for relativistic plasmas | 12 pages, revtex style, no figures, minor changes, accepted for
publication in MNRAS | Mon.Not.Roy.Astron.Soc. 385 (2008) 883 | 10.1111/j.1365-2966.2008.12862.x | null | astro-ph gr-qc | null | We generalise the relativistic expression of Ohm's law by studying a
multi-fluid system of charged species using the 1+3 covariant formulation of
general relativistic electrodynamics. This is done by providing a fully
relativistic, fully nonlinear propagation equation for the spatial component of
the electric 4-current. Our analysis proceeds along the lines of the
non-relativistic studies and extends previous relativistic work on cold
plasmas. Exploiting the compactness and transparency of the covariant
formalism, we provide a direct comparison with the standard Newtonian versions
of Ohm's law and identify the relativistic corrections in an unambiguous way.
The generalised expression of Ohm's law is initially given relative to an
arbitrary observer and for a multi-component relativistic charged medium. Then,
the law is written with respect to the Eckart frame and for a hot two-fluid
plasma with zero total charge. Finally, we apply our analysis to a cold
proton-electron plasma and recover the well known magnetohydrodynamic
expressions. In every step, we discuss the approximations made and identify
familiar effects, like the Biermann-battery and the Hall effect.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 13:45:00 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Dec 2007 13:05:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kandus",
"Alejandra",
"",
"UESC-Brazil"
],
[
"Tsagas",
"Christos G.",
"",
"AUTH-Greece"
]
] | [
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] |
711.3574 | Nelson Vieira | P. Cerejeiras and N. Vieira | Fundamental Solutions of the Instationary Schrodinger Difference
Operator | Submited to publication in Advances in Applied Clifford Algebras
(special issue for WCAA 07) | null | null | null | math-ph math.CV math.MP | null | In this paper we will study the existence of fundamental solutions for the
explicit and implicit backward time dependent Schodinger equation, via discrete
Fourier transform and its symbol for the Laplace operator. In both cases we
will prove that the discrete fundamental solutions obtained converges to the
continuous fundamental solution in the $l_1-$norm sense.
| [
{
"version": "v1",
"created": "Fri, 23 Nov 2007 15:22:13 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Cerejeiras",
"P.",
""
],
[
"Vieira",
"N.",
""
]
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] |
711.3575 | Kenta Kiuchi | Kenta Kiuchi and Hisa-aki Shinkai | Numerical experiments of adjusted BSSN systems for controlling
constraint violations | to be published in PRD | Phys.Rev.D77:044010,2008 | 10.1103/PhysRevD.77.044010 | null | gr-qc astro-ph | null | We present our numerical comparisons between the BSSN formulation widely used
in numerical relativity today and its adjusted versions using constraints. We
performed three testbeds: gauge-wave, linear wave, and Gowdy-wave tests,
proposed by the Mexico workshop on the formulation problem of the Einstein
equations. We tried three kinds of adjustments, which were previously proposed
from the analysis of the constraint propagation equations, and investigated how
they improve the accuracy and stability of evolutions. We observed that the
signature of the proposed Lagrange multipliers are always right and the
adjustments improve the convergence and stability of the simulations. When the
original BSSN system already shows satisfactory good evolutions (e.g., linear
wave test), the adjusted versions also coincide with those evolutions; while in
some cases (e.g., gauge-wave or Gowdy-wave tests) the simulations using the
adjusted systems last 10 times as long as those using the original BSSN
equations. Our demonstrations imply a potential to construct a robust evolution
system against constraint violations even in highly dynamical situations.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:01:24 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Jan 2008 11:01:02 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kiuchi",
"Kenta",
""
],
[
"Shinkai",
"Hisa-aki",
""
]
] | [
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711.3576 | Bakmaev Sabir | E. A. Kuraev, V. V. Bytev, S. Bakmaev, E.N. Antonov | Testing the RRPP vertex of effective Regge action | 9 pages | Phys.Lett.B664:274-278,2008 | 10.1016/j.physletb.2008.05.042 | null | hep-ph | null | In frames of effective Regge action the vertices describing conversion of two
reggeized gluons to one two and three ordinary gluons was constructed. The
self-consistency: Bose symmetry and gauge invariance properties checks was
shown to be fulfilled. The simplest one with creation of a single gluon was
intensively verified in programs of experimental and theoretical treatment
since it determine the kernel of of the known BFKL equation. Here we discuss
the possibility to check the vertex with creation of two real gluons, which can
reveal itself in process of scalar mesons production in high energy peripheral
nucleons collisions. We show that the mechanisms which include emission of two
gluons in the same effective vertex contribution dominate compared with one
with the creation of two separate gluons. Numerical estimations of cross
section of pair of charged pions production for LHC facility give the value or
order $10 mb$. As well we estimate the excess of production of positively
charged muons (as a decay of pions) created by cosmic ray proton collisions
with the atmosphere gas nuclei to be in a reasonable agreement with modern
data.
| [
{
"version": "v1",
"created": "Fri, 23 Nov 2007 15:18:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kuraev",
"E. A.",
""
],
[
"Bytev",
"V. V.",
""
],
[
"Bakmaev",
"S.",
""
],
[
"Antonov",
"E. N.",
""
]
] | [
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] |
711.3577 | T. Merkouris | T. Merkouris | Transform martingale estimating functions | Published in at http://dx.doi.org/10.1214/009053607000000299 the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Statistics 2007, Vol. 35, No. 5, 1975-2000 | 10.1214/009053607000000299 | IMS-AOS-AOS0258 | math.ST stat.TH | null | An estimation method is proposed for a wide variety of discrete time
stochastic processes that have an intractable likelihood function but are
otherwise conveniently specified by an integral transform such as the
characteristic function, the Laplace transform or the probability generating
function. This method involves the construction of classes of transform-based
martingale estimating functions that fit into the general framework of
quasi-likelihood. In the parametric setting of a discrete time stochastic
process, we obtain transform quasi-score functions by projecting the
unavailable score function onto the special linear spaces formed by these
classes. The specification of the process by any of the main integral
transforms makes possible an arbitrarily close approximation of the score
function in an infinite-dimensional Hilbert space by optimally combining
transform martingale quasi-score functions. It also allows an extension of the
domain of application of quasi-likelihood methodology to processes with
infinite conditional second moment.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:03:14 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Merkouris",
"T.",
""
]
] | [
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] |
711.3578 | Seyed Majid Saberi Fathi | Maurice Courbage (MSC), Seyed Majid Saberi Fathi (MSC) | A formula for the spectral projection of the time operator | This paper will be published in the proceeding of XXV Workshop on
Geometric Methods in Physics in the Journal of Geometry and Symmetry in
Physics | null | null | null | quant-ph | null | In this paper, we study the one-level Friedrichs model with using the quantum
time super-operator that predicts the excited state decay inside the continuum.
Its survival probability in long time limit is an algebraically decreasing
function and an exponentially decreasing multiplied by the oscillating
functions.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:04:11 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Courbage",
"Maurice",
"",
"MSC"
],
[
"Fathi",
"Seyed Majid Saberi",
"",
"MSC"
]
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711.3579 | - Departement Mathematiques Orsay | Valentin Poenaru (LM-Orsay) | Discrete symmetry with compact fundamental domain, and geometric simple
connectivity - A provisional Outline of work in Progress - | null | null | null | null | math.GT | null | We show that a certain geometric property, the QSF introduced by S. Brick and
M. Mihalik, is universally true for {\ibf all} finitely presented groups
$\Gamma$. One way of defining this property is the existence of a smooth
compact manifold $M$ with $\pi_1 M = \Gamma$, such that $\tilde M$ is
geometrically simply-connected ({\it i.e.} without handles of index $\lambda =
1$). There are also alternative, more group-theoretical definitions, which are
presentation independent. But $\Gamma \in {\rm QSF}$ is not only a universal
property, it is quite highly non-trivial too; its very special case for $\Gamma
= \pi_1 M^3$ (where it means $\pi_1^{\infty} \tilde M^3 = 0$) is actually
already known, as a corollary of G. Perelman's big breakthrough on the
Geometrization of 3-Manifolds.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:05:11 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Poenaru",
"Valentin",
"",
"LM-Orsay"
]
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711.358 | Giovanni Feverati | Giovanni Feverati, Fabio Musso | An evolutionary model with Turing machines | 16 pages, 7 figures | null | 10.1103/PhysRevE.77.061901 | LAPTH-1217/07 | q-bio.QM cs.NE q-bio.GN | null | The development of a large non-coding fraction in eukaryotic DNA and the
phenomenon of the code-bloat in the field of evolutionary computations show a
striking similarity. This seems to suggest that (in the presence of mechanisms
of code growth) the evolution of a complex code can't be attained without
maintaining a large inactive fraction. To test this hypothesis we performed
computer simulations of an evolutionary toy model for Turing machines, studying
the relations among fitness and coding/non-coding ratio while varying mutation
and code growth rates. The results suggest that, in our model, having a large
reservoir of non-coding states constitutes a great (long term) evolutionary
advantage.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:47:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Feverati",
"Giovanni",
""
],
[
"Musso",
"Fabio",
""
]
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711.3581 | Josep Perello | Carl Chiarella, Giulia Iori, Josep Perello | The Impact of Heterogeneous Trading Rules on the Limit Order Book and
Order Flows | 15 pages, 11 figures | Journal of Economic Dynamics and Control 33, 525 (2009) | 10.1016/j.jedc.2008.08.001 | null | q-fin.TR physics.soc-ph | null | In this paper we develop a model of an order-driven market where traders set
bids and asks and post market or limit orders according to exogenously fixed
rules. Agents are assumed to have three components to the expectation of future
asset returns, namely-fundamentalist, chartist and noise trader. Furthermore
agents differ in the characteristics describing these components, such as time
horizon, risk aversion and the weights given to the various components. The
model developed here extends a great deal of earlier literature in that the
order submissions of agents are determined by utility maximisation, rather than
the mechanical unit order size that is commonly assumed. In this way the order
flow is better related to the ongoing evolution of the market. For the given
market structure we analyze the impact of the three components of the trading
strategies on the statistical properties of prices and order flows and observe
that it is the chartist strategy that is mainly responsible of the fat tails
and clustering in the artificial price data generated by the model. The paper
provides further evidence that large price changes are likely to be generated
by the presence of large gaps in the book.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:10:06 GMT"
}
] | 2009-02-16T00:00:00 | [
[
"Chiarella",
"Carl",
""
],
[
"Iori",
"Giulia",
""
],
[
"Perello",
"Josep",
""
]
] | [
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711.3582 | Faycal Ben Adda | Faycal Ben Adda | Mathematical model for fractal manifold | 30 page, A new mathematical object that describe a variable geometry | Int.J.PureAppl.Math.38:159-190,2007 | null | null | physics.gen-ph | null | We have built a new kind of manifolds which leads to an alternative new
geometrical space. The study of the nowhere differentiable functions via a
family of mean functions leads to a new characterization of this category of
functions. A fluctuant manifold has been built with an appearance of a new
structure on it at every scale, and we embedded into it an internal structure
to transform its fluctuant geometry to a new fixed geometry. This approach
leads us to what we call fractal manifold. The elements of this kind of
manifold appear locally as tiny double strings, with an appearance of new
structure at every step of approximation. We have obtained a variable
dimensional space which is locally neither a continuum nor a discrete, but a
mixture of both. Space acquires a variable geometry, it becomes explicitly
dependent on the approximation process, and the geometry on it assumed to be
characterized not only by curvature, but also by the appearance of new
structure at every step of approximation.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:11:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Adda",
"Faycal Ben",
""
]
] | [
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711.3583 | Jean-Marc Bouclet | Jean-Marc Bouclet | Semi-classical calculus on manifolds with ends and weighted Lp estimates | 33 pages | null | null | null | math.AP math.SP | null | For a class of non compact Riemannian manifolds with ends, we give
pseudo-differential expansions of bounded functions of the semi-classical
Laplacian and study related Lp boundedness properties.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:13:26 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Bouclet",
"Jean-Marc",
""
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] |
711.3584 | Fab\'iola Ribeiro | Fabiola M. A. Ribeiro, Marcos P. Diaz | Tomographic Simulations of Accretion Disks in Cataclysmic Variables -
Flickering and Wind | 9 pages, 9 figures | Publ. Astron. Soc. Japan 60, pp.327-335 (2008) | 10.1093/pasj/60.2.327 | null | astro-ph | null | Both continuum and emission line flickering are phenomena directly associated
with the mass accretion process. In this work we simulate accretion disk
Doppler maps including the effects of winds and flickering flares. Synthetic
flickering Doppler maps are calculated and the effect of the flickering
parameters on the maps is explored. Jets and winds occur in many astrophysical
objects where accretion disks are present. Jets are generally absent among the
cataclysmic variables (CVs), but there is evidence of mass loss by wind in many
objects. CVs are ideal objects to study accretion disks and consequently to
study the wind associated with these disks. We also present simulations of
accretion disks including the presence of a wind with orbital phase resolution.
Synthetic H-alpha line profiles in the optical region are obtained and their
corresponding Doppler maps are calculated. The effect of the wind simulation
parameters on the wind line profiles is also explored. From this study we
verified that optically thick lines and/or emission by diffuse material into
the primary Roche lobe are necessary to generate single peaked line profiles,
often seen in CVs. The future accounting of these effects is suggested for
interpreting Doppler tomography reconstructions.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:17:29 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Ribeiro",
"Fabiola M. A.",
""
],
[
"Diaz",
"Marcos P.",
""
]
] | [
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711.3585 | Jean-Marc Bouclet | Jean-Marc Bouclet | Littlewood-Paley decompositions on manifolds with ends | 25 pages | null | null | null | math.AP math.CA | null | For certain non compact Riemannian manifolds with ends, we obtain
Littlewood-Paley type estimates on (weighted) Lp spaces, using the usual square
function defined by a dyadic partition.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:20:08 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Bouclet",
"Jean-Marc",
""
]
] | [
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711.3586 | Jonathan Plumridge Dr | Jonathan Plumridge | Mid-Infrared waveguides and negative refraction with anisotropic
metamaterials | null | null | null | null | cond-mat.mtrl-sci cond-mat.other | null | We propose two metamaterial waveguides, operating in the mid-IR, which would
display negative refraction. The first waveguide is a metallic strip
incorporating quantum wells, whereas the second is a dielectric waveguide which
incorporates quantum wells. The negative refraction of both waveguides occurs
around the intersubband transition (ISBT) of the quantum wells and is dependent
upon the 2D concentration of electron within the wells; these materials could
be grown by conventional semiconductor technology (MBE) and the electron
concentration within the wells controlled externally by electric fields or
optically pumping.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:23:37 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Plumridge",
"Jonathan",
""
]
] | [
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] |
711.3587 | Jean-Marc Bouclet | Jean-Marc Bouclet | Strichartz estimates on asymptotically hyperbolic manifolds | 85 pages ; references added | null | null | null | math.AP math.DG | null | We prove local in time Strichartz estimates without loss for the restriction
of the solution of the Schroedinger equation, outside a large compact set, on a
class of asymptotically hyperbolic manifolds.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:26:51 GMT"
},
{
"version": "v2",
"created": "Wed, 28 Nov 2007 13:04:17 GMT"
}
] | 2007-11-28T00:00:00 | [
[
"Bouclet",
"Jean-Marc",
""
]
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711.3588 | Artem Lopatin Anatol'evich | A.A. Lopatin, A.N. Zubkov | Representations of quivers, their generalizations and invariants | 31 pages; v2. Formulations of Theorems 3.16 and 5.9 are corrected | Herald of Omsk Univ., Special Issue: Combinatorial Methods of
Algebra and Complexity of Computations (2008), 9-24 | null | null | math.RT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is a survey on invariants of representations of quivers and their
generalizations. We present the description of generating systems for
invariants and relations between generators.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:34:42 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Apr 2009 15:10:09 GMT"
}
] | 2009-04-27T00:00:00 | [
[
"Lopatin",
"A. A.",
""
],
[
"Zubkov",
"A. N.",
""
]
] | [
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711.3589 | Ngai Hang Chan | Boris Buchmann, Ngai Hang Chan | Asymptotic theory of least squares estimators for nearly unstable
processes under strong dependence | Published in at http://dx.doi.org/10.1214/009053607000000136 the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Statistics 2007, Vol. 35, No. 5, 2001-2017 | 10.1214/009053607000000136 | IMS-AOS-AOS0250 | math.ST stat.TH | null | This paper considers the effect of least squares procedures for nearly
unstable linear time series with strongly dependent innovations. Under a
general framework and appropriate scaling, it is shown that ordinary least
squares procedures converge to functionals of fractional Ornstein--Uhlenbeck
processes. We use fractional integrated noise as an example to illustrate the
important ideas. In this case, the functionals bear only formal analogy to
those in the classical framework with uncorrelated innovations, with Wiener
processes being replaced by fractional Brownian motions. It is also shown that
limit theorems for the functionals involve nonstandard scaling and nonstandard
limiting distributions. Results of this paper shed light on the asymptotic
behavior of nearly unstable long-memory processes.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:35:36 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Buchmann",
"Boris",
""
],
[
"Chan",
"Ngai Hang",
""
]
] | [
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] |
711.359 | Tobias Huber | G. Heinrich, T. Huber, D. Maitre | Master Integrals for Fermionic Contributions to Massless Three-Loop Form
Factors | 12 pages, 1 figure. References added and updated. Appendix on
evaluation of Mellin-Barnes integrals added. Version to appear in PLB | Phys.Lett.B662:344-352,2008 | 10.1016/j.physletb.2008.03.028 | null | hep-ph | null | In this letter we continue the calculation of master integrals for massless
three-loop form factors by giving analytical results for those integrals which
are relevant for the fermionic contributions proportional to N_F^2, N_F*N, and
N_F/N. Working in dimensional regularisation, we express one of the integrals
in a closed form which is exact to all orders in epsilon, containing
Gamma-functions and hypergeometric functions of unit argument. In all other
cases we derive multiple Mellin-Barnes representations from which the
coefficients of the Laurent expansion in epsilon are extracted in an analytical
form. To obtain the finite part of the three-loop quark and gluon form factors,
all coefficients through transcendentality six in the Riemann zeta-function
have to be included.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:38:28 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Mar 2008 15:48:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Heinrich",
"G.",
""
],
[
"Huber",
"T.",
""
],
[
"Maitre",
"D.",
""
]
] | [
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] |
711.3591 | Uwe Aickelin | Uwe Aickelin, Edmund Burke and Jingpeng Li | An Estimation of Distribution Algorithm with Intelligent Local Search
for Rule-based Nurse Rostering | null | Journal of the Operational Research Society, 58 (12), pp
1574-1585, 2007 | 10.1057/palgrave.jors.2602308 | null | cs.NE cs.CE | null | This paper proposes a new memetic evolutionary algorithm to achieve explicit
learning in rule-based nurse rostering, which involves applying a set of
heuristic rules for each nurse's assignment. The main framework of the
algorithm is an estimation of distribution algorithm, in which an ant-miner
methodology improves the individual solutions produced in each generation.
Unlike our previous work (where learning is implicit), the learning in the
memetic estimation of distribution algorithm is explicit, i.e. we are able to
identify building blocks directly. The overall approach learns by building a
probabilistic model, i.e. an estimation of the probability distribution of
individual nurse-rule pairs that are used to construct schedules. The local
search processor (i.e. the ant-miner) reinforces nurse-rule pairs that receive
higher rewards. A challenging real world nurse rostering problem is used as the
test problem. Computational results show that the proposed approach outperforms
most existing approaches. It is suggested that the learning methodologies
suggested in this paper may be applied to other scheduling problems where
schedules are built systematically according to specific rules
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:16:21 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 17:14:51 GMT"
}
] | 2010-07-05T00:00:00 | [
[
"Aickelin",
"Uwe",
""
],
[
"Burke",
"Edmund",
""
],
[
"Li",
"Jingpeng",
""
]
] | [
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] |
711.3592 | Sergio Navas-Concha | A. Bueno, J. Lozano, A.J. Melgarejo, F.J. Munoz, J.L. Navarro, S.
Navas and A.G. Ruiz | Characterization of large area photomultipliers and its application to
dark matter search with noble liquid detectors | 19 pages, 14 figures | JINST 3:P01006,2008 | 10.1088/1748-0221/3/01/P01006 | null | physics.ins-det | null | There is growing interest in the use of noble liquid detectors to study
particle properties and search for new phenomena. In particular, they are
extremely suitable for performing direct searches for dark matter. In this kind
of experiments, the light produced after an interaction within the sensitive
volume is usually read-out by photomultipliers. The need to go to masses in the
tonne scale to explore deeper regions of the parameter space, calls for the use
of large area photomultipliers. In this paper we address the need to perform
laboratory calibration measurements of these large photomultipliers, in
particular to characterize its behaviour at cryogenic temperatures where no
reference from the manufacturer is available. We present comparative tests of
phototubes from two companies. The tests are performed in conditions similar to
those of operation in a real experiment. Measurements of the most relevant
phototube parameters (quantum efficiency, gain, linearity, etc.) both at room
and liquid Argon temperatures are reported. The results show that the studied
phototubes comply with the stringent requirements posed by current dark matter
searches performed with noble-liquid detectors.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:52:17 GMT"
},
{
"version": "v2",
"created": "Tue, 27 Nov 2007 10:14:19 GMT"
}
] | 2009-12-10T00:00:00 | [
[
"Bueno",
"A.",
""
],
[
"Lozano",
"J.",
""
],
[
"Melgarejo",
"A. J.",
""
],
[
"Munoz",
"F. J.",
""
],
[
"Navarro",
"J. L.",
""
],
[
"Navas",
"S.",
""
],
[
"Ruiz",
"A. G.",
""
]
] | [
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] |
711.3593 | Nigel Hambly | N. C. Hambly, R. S. Collins, N. J. G. Cross, R. G. Mann, M. A. Read,
E. T. W. Sutorius, I. A. Bond, J. Bryant, J. P. Emerson, A. Lawrence, J. M.
Stewart, P. M. Williams, A. Adamson, S. Dye, P. Hirst, S. J. Warren | The WFCAM Science Archive | 28 pages, 18 figures; accepted for publication in MNRAS (2007
November 8) | null | 10.1111/j.1365-2966.2007.12700.x | null | astro-ph | null | We describe the WFCAM Science Archive (WSA), which is the primary point of
access for users of data from the wide-field infrared camera WFCAM on the
United Kingdom Infrared Telescope (UKIRT), especially science catalogue
products from the UKIRT Infrared Deep Sky Survey (UKIDSS). We describe the
database design with emphasis on those aspects of the system that enable users
to fully exploit the survey datasets in a variety of different ways. We give
details of the database-driven curation applications that take data from the
standard nightly pipeline-processed and calibrated files for the production of
science-ready survey datasets. We describe the fundamentals of querying
relational databases with a set of astronomy usage examples, and illustrate the
results.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 14:57:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hambly",
"N. C.",
""
],
[
"Collins",
"R. S.",
""
],
[
"Cross",
"N. J. G.",
""
],
[
"Mann",
"R. G.",
""
],
[
"Read",
"M. A.",
""
],
[
"Sutorius",
"E. T. W.",
""
],
[
"Bond",
"I. A.",
""
],
[
"Bryant",
"J.",
""
],
[
"Emerson",
"J. P.",
""
],
[
"Lawrence",
"A.",
""
],
[
"Stewart",
"J. M.",
""
],
[
"Williams",
"P. M.",
""
],
[
"Adamson",
"A.",
""
],
[
"Dye",
"S.",
""
],
[
"Hirst",
"P.",
""
],
[
"Warren",
"S. J.",
""
]
] | [
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] |
711.3594 | Chunjing Xu | Chunjing Xu, Jianzhuang Liu, Xiaoou Tang | Clustering with Transitive Distance and K-Means Duality | 13 pages, 6 figures | null | null | null | cs.LG | null | Recent spectral clustering methods are a propular and powerful technique for
data clustering. These methods need to solve the eigenproblem whose
computational complexity is $O(n^3)$, where $n$ is the number of data samples.
In this paper, a non-eigenproblem based clustering method is proposed to deal
with the clustering problem. Its performance is comparable to the spectral
clustering algorithms but it is more efficient with computational complexity
$O(n^2)$. We show that with a transitive distance and an observed property,
called K-means duality, our algorithm can be used to handle data sets with
complex cluster shapes, multi-scale clusters, and noise. Moreover, no
parameters except the number of clusters need to be set in our algorithm.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:05:35 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Xu",
"Chunjing",
""
],
[
"Liu",
"Jianzhuang",
""
],
[
"Tang",
"Xiaoou",
""
]
] | [
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] |
711.3595 | Luzi Bergamin | Luzi Bergamin, Rene Meyer | Two-Dimensional Quantum Gravity with Boundary | 8 p., no figures; to appear in the proceedings of the 4th workshop
"Gravity, Astrophysics, and Strings at the Black Sea", Primorsko, June 10-16,
2007 | null | null | MPP-2007-171 | hep-th gr-qc | null | Using the recently found first order formulation of two-dimensional dilaton
gravity with boundary, we perform a Hamiltonian analysis and subsequent path
integral quantization. The importance of the boundary terms to obtain the
correct quantum result are outlined and the quantum triviality of the theory is
shown to hold with this modification as well. We compare with recent classical
results and comment on further applications.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:15:46 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Bergamin",
"Luzi",
""
],
[
"Meyer",
"Rene",
""
]
] | [
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] |
711.3596 | Roberto Pittau | Giovanni Ossola, Costas G. Papadopoulos, Roberto Pittau | CutTools: a program implementing the OPP reduction method to compute
one-loop amplitudes | Version published in JHEP | JHEP 0803:042,2008 | 10.1088/1126-6708/2008/03/042 | null | hep-ph | null | We present a program that implements the OPP reduction method to extract the
coefficients of the one-loop scalar integrals from a user defined
(sub)-amplitude or Feynman Diagram, as well as the rational terms coming from
the 4-dimensional part of the numerator. The rational pieces coming from the
epsilon-dimensional part of the numerator are treated as an external input, and
can be computed with the help of dedicated tree-level like Feynman rules.
Possible numerical instabilities are dealt with the help of arbitrary
precision routines, that activate only when needed.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:24:20 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Apr 2008 15:40:28 GMT"
}
] | 2011-05-05T00:00:00 | [
[
"Ossola",
"Giovanni",
""
],
[
"Papadopoulos",
"Costas G.",
""
],
[
"Pittau",
"Roberto",
""
]
] | [
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711.3597 | Erik I. Broman | Erik I. Broman | Stochastic domination for a hidden Markov chain with applications to the
contact process in a randomly evolving environment | Published in at http://dx.doi.org/10.1214/0091179606000001187 the
Annals of Probability (http://www.imstat.org/aop/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Probability 2007, Vol. 35, No. 6, 2263-2293 | 10.1214/0091179606000001187 | IMS-AOP-AOP319 | math.PR | null | The ordinary contact process is used to model the spread of a disease in a
population. In this model, each infected individual waits an exponentially
distributed time with parameter 1 before becoming healthy. In this paper, we
introduce and study the contact process in a randomly evolving environment.
Here we associate to every individual an independent two-state, $\{0,1\},$
background process. Given $\delta_0<\delta_1,$ if the background process is in
state $0,$ the individual (if infected) becomes healthy at rate $\delta_0,$
while if the background process is in state $1,$ it becomes healthy at rate
$\delta_1.$ By stochastically comparing the contact process in a randomly
evolving environment to the ordinary contact process, we will investigate
matters of extinction and that of weak and strong survival. A key step in our
analysis is to obtain stochastic domination results between certain point
processes. We do this by starting out in a discrete setting and then taking
continuous time limits.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:28:23 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Broman",
"Erik I.",
""
]
] | [
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] |
711.3598 | Heping He | Heping He, Thomas A. Severini | Higher-order asymptotic normality of approximations to the modified
signed likelihood ratio statistic for regular models | Published in at http://dx.doi.org/10.1214/009053607000000307 the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Statistics 2007, Vol. 35, No. 5, 2054-2074 | 10.1214/009053607000000307 | IMS-AOS-AOS0268 | math.ST stat.TH | null | Approximations to the modified signed likelihood ratio statistic are
asymptotically standard normal with error of order $n^{-1}$, where $n$ is the
sample size. Proofs of this fact generally require that the sufficient
statistic of the model be written as $(\hat{\theta},a)$, where $\hat{\theta}$
is the maximum likelihood estimator of the parameter $\theta$ of the model and
$a$ is an ancillary statistic. This condition is very difficult or impossible
to verify for many models. However, calculation of the statistics themselves
does not require this condition. The goal of this paper is to provide
conditions under which these statistics are asymptotically normally distributed
to order $n^{-1}$ without making any assumption about the sufficient statistic
of the model.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:28:33 GMT"
}
] | 2007-12-18T00:00:00 | [
[
"He",
"Heping",
""
],
[
"Severini",
"Thomas A.",
""
]
] | [
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] |
711.3599 | Bin Wang | Songbai Chen, Bin Wang, Ru-Keng Su and W.-Y Pauchy Hwang | Greybody Factors for Rotating Black Holes on Codimension-2 Branes | 16 pages, 7 figures, minor modification, accepted for publication in
JHEP | JHEP0803:019,2008 | 10.1088/1126-6708/2008/03/019 | null | hep-th gr-qc | null | We study the absorption probability and Hawking radiation of the scalar field
in the rotating black holes on codimension-2 branes. We find that finite brane
tension modifies the standard results in Hawking radiation if compared with the
case when brane tension is completely negligible. We observe that the rotation
of the black hole brings richer physics. Nonzero angular momentum triggers the
super-radiance which becomes stronger when the angular momentum increases. We
also find that rotations along different angles influence the result in
absorption probability and Hawking radiation. Compared with the black hole
rotating orthogonal to the brane, in the background that black hole spins on
the brane, its angular momentum brings less super-radiance effect and the brane
tension increases the range of frequency to accommodate super-radiance. These
information can help us know more about the rotating codimension-2 black holes.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:30:11 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 12:35:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chen",
"Songbai",
""
],
[
"Wang",
"Bin",
""
],
[
"Su",
"Ru-Keng",
""
],
[
"Hwang",
"W. -Y Pauchy",
""
]
] | [
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] |
711.36 | Radoslav Rashkov | M. Kreuzer, C. Mayrhofer and R.C. Rashkov | A note on the Near Flat Limit for strings in the Maldacena-Nunez
background | 1+23 pages, introduction improved and clarifying comments added,
references added, results remain unchanged | Phys.Rev.D77:066016,2008 | 10.1103/PhysRevD.77.066016 | ESI-1983, TUW-07-16 | hep-th | null | Recently Maldacena and Swanson suggested a new limit of string theory on the
$AdS_5\times S^5$ background, the so called near flat space limit. The
resulting reduced theory interpolates between the pp-wave limit and giant
magnon type string solutions. It was shown that the reduced model possess many
features of the original theory. On the other hand, theories with less
supersymmetry are of great importance for the string/gauge theory
correspondence. In this paper we study the near flat limit reduction of string
theory on the Maldacena-Nunez background, which is dual to $\N=1$ Yang-Mills
theory. The reduced model interpolates between the pp-wave limit and a certain
magnon type subsector of the theory. The similarity of the structures of the
reduced model obtained here and that by Maldacena and Swanson indicates the
possibility of existence of integrable subsectors of strings on the
Maldacena-Nunez background.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:31:31 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Dec 2007 13:15:26 GMT"
},
{
"version": "v3",
"created": "Wed, 12 Dec 2007 14:27:25 GMT"
},
{
"version": "v4",
"created": "Sun, 27 Jan 2008 17:32:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kreuzer",
"M.",
""
],
[
"Mayrhofer",
"C.",
""
],
[
"Rashkov",
"R. C.",
""
]
] | [
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] |
711.3601 | Sijme-Jan Paardekooper | S.-J. Paardekooper, G. Mellema | Growing and moving low-mass planets in non-isothermal disks | Accepted for publication in Astronomy and Astrophysics | null | 10.1051/0004-6361:20078592 | null | astro-ph | null | We study the interaction of a low-mass planet with a protoplanetary disk with
a realistic treatment of the energy balance by doing radiation-hydrodynamical
simulations. We look at accretion and migration rates and compare them to
isothermal studies. We used a three-dimensional version of the hydrodynamical
method RODEO, together with radiative transport in the flux-limited diffusion
approach. The accretion rate, as well as the torque on the planet, depend
critically on the ability of the disk to cool efficiently. For densities
appropriate to 5 AU in the solar nebula, the accretion rate drops by more than
an order of magnitude compared to isothermal models, while at the same time the
torque on the planet is positive, indicating outward migration. It is necessary
to lower the density by a factor of 2 to recover inward migration and more than
2 orders of magnitude to recover the usual Type I migration. The torque appears
to be proportional to the radial entropy gradient in the unperturbed disk.
These findings are critical for the survival of protoplanets, and they should
ultimately find their way into population synthesis models.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:35:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Paardekooper",
"S. -J.",
""
],
[
"Mellema",
"G.",
""
]
] | [
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] |
711.3602 | Nelson Pinto-Neto | Nelson Pinto-Neto and Bernardo M. O. Fraga | Cosmic acceleration from interaction of ordinary fluids | 10 pages, no figures, accepted for publication in General Relativity
and Gravitation | Gen.Rel.Grav.40:1653-1662,2008 | 10.1007/s10714-007-0565-5 | null | gr-qc | null | Cosmological models with two interacting fluids, each satisfying the strong
energy condition, are studied in the framework of classical General Relativity.
If the interactions are phenomenologically described by a power law in the
scale factor, the two initial interacting fluids can be equivalently
substituted by two non interacting effective fluids, where one of them may
violate the strong energy condition and/or have negative energy density.
Analytical solutions of the Friedmann equations of this general setting are
obtained and studied. One may have, depending on the scale where the
interaction becomes important, non singular universes with early accelerated
phase, or singular models with transition from decelerated to accelerated
expansion at large scales. Among the first, there are bouncing models where
contraction is stopped by the interaction. In the second case, one obtains dark
energy expansion rates without dark energy, like $\Lambda$CDM or phantomic
accelerated expansions without cosmological constant or phantoms, respectively.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:36:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pinto-Neto",
"Nelson",
""
],
[
"Fraga",
"Bernardo M. O.",
""
]
] | [
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] |
711.3603 | Chiaki Hikage | Chiaki Hikage, Peter Coles, Margherita Grossi, Lauro Moscardini, Klaus
Dolag, Enzo Branchini and Sabino Matarrese | The Effect of Primordial Non--Gaussianity on the Topology of Large-Scale
Structure | 9 pages, 3 figures, accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc.385:1613,2008 | 10.1111/j.1365-2966.2008.12944.x | null | astro-ph | null | We study the effect of primordial non-Gaussianity on the development of
large-scale cosmic structure using high-resolution N-body simulations. In
particular, we focus on the topological properties of the "cosmic web",
quantitatively characterized by the Minkowski Functionals, for models with
quadratic non-linearities with different values of the usual non-Gaussianity
parameter fNL. In the weakly non-linear regime, we find that analytic formulae
derived from perturbation theory agree with the numerical results within a few
percent of the amplitude of each MF when |fNL|<1000. In the non-linear regime,
the detailed behavior of the MFs as functions of threshold density deviates
more strongly from the analytical curves, while the overall amplitude of the
primordial non-Gaussian effect remains comparable to the perturbative
prediction. When smaller-scale information is included, the influence of
primordial non-Gaussianity becomes increasingly significant statistically due
to decreasing sample variance. We find that the effect of the primordial
non-Gaussianity with |fNL|=50 is comparable to the sample variance of mass
density fields with a volume of 0.125(Gpc/h)^3 when they are smoothed by
Gaussian filter at a scale of 5Mpc/h. The detectability of this effect in
actual galaxy surveys will strongly depend upon residual uncertainties in
cosmological parameters and galaxy biasing.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 16:00:38 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Jan 2008 20:32:09 GMT"
}
] | 2011-06-22T00:00:00 | [
[
"Hikage",
"Chiaki",
""
],
[
"Coles",
"Peter",
""
],
[
"Grossi",
"Margherita",
""
],
[
"Moscardini",
"Lauro",
""
],
[
"Dolag",
"Klaus",
""
],
[
"Branchini",
"Enzo",
""
],
[
"Matarrese",
"Sabino",
""
]
] | [
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] |
711.3604 | Floris van der Tak | Floris van der Tak (SRON Groningen) | Recent Astrochemical Results on Star-Forming Regions | Contribution to proceedings of conference "Massive Star Formation:
Observations confront Theory" (Heidelberg 2007); 8 DIN A4 pages. Version 2:
some references added | null | null | null | astro-ph | null | This review discusses recent results on the astrochemistry of (mostly
high-mass) star-forming regions. After an introduction on the use of chemistry
in astrophysics and some basic concepts of astrochemistry, specific results are
presented. Highlighted areas are the use of chemistry in the search for massive
circumstellar disks, the interaction of molecular clouds with cosmic rays, and
the feedback effects of protostellar irradiation on the parent molecular cloud.
The review concludes with a discussion of future observational opportunities.
| [
{
"version": "v1",
"created": "Fri, 23 Nov 2007 10:37:34 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"van der Tak",
"Floris",
"",
"SRON Groningen"
]
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711.3605 | Eric Laporte | Eric Laporte (IGM-LabInfo), Christian Lecl\`ere (IGM-LabInfo), Maria
Carmelita P. Dias | Very strict selectional restrictions | null | Dans Proceedings - Very strict selectional restrictions. A
Comparison between Portuguese and French, Itatiaia : Br\'esil (2006) | null | null | cs.CL | null | We discuss the characteristics and behaviour of two parallel classes of verbs
in two Romance languages, French and Portuguese. Examples of these verbs are
Port. abater [gado] and Fr. abattre [b\'etail], both meaning "slaughter
[cattle]". In both languages, the definition of the class of verbs includes
several features: - They have only one essential complement, which is a direct
object. - The nominal distribution of the complement is very limited, i.e., few
nouns can be selected as head nouns of the complement. However, this selection
is not restricted to a single noun, as would be the case for verbal idioms such
as Fr. monter la garde "mount guard". - We excluded from the class
constructions which are reductions of more complex constructions, e.g. Port.
afinar [instrumento] com "tune [instrument] with".
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 15:54:31 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Laporte",
"Eric",
"",
"IGM-LabInfo"
],
[
"Leclère",
"Christian",
"",
"IGM-LabInfo"
],
[
"Dias",
"Maria Carmelita P.",
""
]
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711.3606 | Je-An Gu | Je-an Gu | Oscillating Quintessence | 4 pages, LaTeX | null | null | null | astro-ph | null | An oscillating scalar field as a quintessence model for dark energy is
proposed. The case of a power-law potential is particularly intriguing and is
the focus of the present article. In this model the equation of state w_{OQ} of
dark energy is a constant determined simply by the power n in the potential
through w_{OQ} = (n-2)/(n+2). Accordingly, when 0 < n < 1, the oscillating
quintessence can provide repulsive gravity and drive the cosmic acceleration.
The condition for oscillation and the constraints from observations are
investigated. For this new scenario a specific natural model with much less
fine tuning is presented.
| [
{
"version": "v1",
"created": "Fri, 23 Nov 2007 18:07:47 GMT"
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] | 2007-11-26T00:00:00 | [
[
"Gu",
"Je-an",
""
]
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] |
711.3607 | Charles Bonatto | Mauro G. Rickes, Miriani G. Pastoriza and Charles Bonatto | Star formation, metallicity gradient and ionized gas: clues to the
formation of the elliptical galaxies NGC6868 and NGC5903 | 11 pages and 12 figs; accepted by MNRAS | null | 10.1111/j.1365-2966.2007.12724.x | null | astro-ph | null | The stellar population, metallicity distribution and ionized gas in the
elliptical galaxies NGC 6868 and NGC 5903 are investigated in this paper by
means of long-slit spectroscopy and stellar population synthesis. Lick indices
in both galaxies present a negative gradient indicating an overabundance of Fe,
Mg, Na and TiO in the central parts with respect to the external regions.
Concerning the emitting gas conspicuously detected in NGC 6868, we test three
hypotheses as ionizing source: an H II region, post-AGB stars and an Active
Galactic Nucleus (AGN). Diagnostic diagrams involving the ratios
$[NII]_{\lambda6584}/H\alpha$, $[OI]_{\lambda6300}/H\alpha$ and
$[SII]_{\lambda6717,31}/H\alpha$, indicate that values measured in the central
region of NGC 6868 are typical of LINERs. Together with the stellar population
synthesis, this result suggests that the main source of gas ionization in NGC
6868 is non-thermal, produced by a low-luminosity AGN, probably with some
contribution of shocks to explain ionization at distances of $\sim3.5$ kpc from
the nucleus.
| [
{
"version": "v1",
"created": "Thu, 22 Nov 2007 16:00:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rickes",
"Mauro G.",
""
],
[
"Pastoriza",
"Miriani G.",
""
],
[
"Bonatto",
"Charles",
""
]
] | [
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