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list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0707.0330 | Mingsheng Ying | Mingsheng Ying, Yuan Feng, Runyao Duan and Zhengfeng Ji | An Algebra of Quantum Processes | null | ACM Transactions on Computational Logic, 10(2009) art. no 19 | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce an algebra qCCS of pure quantum processes in which no classical
data is involved, communications by moving quantum states physically are
allowed, and computations is modeled by super-operators. An operational
semantics of qCCS is presented in terms of (non-probabilistic) labeled
transition systems. Strong bisimulation between processes modeled in qCCS is
defined, and its fundamental algebraic properties are established, including
uniqueness of the solutions of recursive equations. To model sequential
computation in qCCS, a reduction relation between processes is defined. By
combining reduction relation and strong bisimulation we introduce the notion of
strong reduction-bisimulation, which is a device for observing interaction of
computation and communication in quantum systems. Finally, a notion of strong
approximate bisimulation (equivalently, strong bisimulation distance) and its
reduction counterpart are introduced. It is proved that both approximate
bisimilarity and approximate reduction-bisimilarity are preserved by various
constructors of quantum processes. This provides us with a formal tool for
observing robustness of quantum processes against inaccuracy in the
implementation of its elementary gates.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 01:49:55 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Sep 2010 22:42:54 GMT"
}
] | 2010-09-08T00:00:00 | [
[
"Ying",
"Mingsheng",
""
],
[
"Feng",
"Yuan",
""
],
[
"Duan",
"Runyao",
""
],
[
"Ji",
"Zhengfeng",
""
]
] |
0707.0331 | Dian Yong Chen | Y. B. Dong | Target mass corrections and twist-3 in the nucleon spin structure
functions | 11 pages, 1 figures | Phys.Lett.B653:18-22,2007 | 10.1016/j.physletb.2007.07.022 | null | hep-ph | null | The Nachtmann moment is employed to study the contribution of twist-3
operator to the nucleon spin structure functions. Target mass corrections to
the Cornwall-Norton moments of the spin structure functions $g_{1,2}$ are
discussed. It is found that the corrections play a sizeable role to the
contribution of the twist-3 $\tilde d_2$ extracted from the Cornwall-Norton
moments.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 02:01:33 GMT"
},
{
"version": "v2",
"created": "Thu, 9 Aug 2007 02:27:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dong",
"Y. B.",
""
]
] |
0707.0332 | Dingping Li | Bo Feng, Zhigang Wu, and Dingping Li | Melting of the vortex lattice in layered superconductors | 15 pages, 2 figures | null | null | null | cond-mat.supr-con cond-mat.stat-mech | null | The structure function of the vortex lattice of layered superconductor is
calculated to one-loop order. Based on a phenomenological melting criterion
concerning the Debye-Waller factor, we calculate the melting line of the vortex
lattice, and compare our results to Monte Carlo simulation and experiment. We
find that our results are quantitatively in good agreement with the Monte Carlo
results. Moreover, our analytic calculation of the melting line of BSCCO fits
the experiment reasonably well in a temperature range not far from Tc.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 02:34:29 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Feng",
"Bo",
""
],
[
"Wu",
"Zhigang",
""
],
[
"Li",
"Dingping",
""
]
] |
0707.0333 | Julian North | J.R. North, J. Davis, T.R. Bedding, M.J. Ireland, A.P. Jacob, J.
O'Byrne, S.M. Owens, J.G. Robertson, W. J. Tango and P. G. Tuthill | The radius and mass of the subgiant star bet Hyi from interferometry and
asteroseismology | 3 figures, 3 tables, to appear in MNRAS Letters | null | 10.1111/j.1745-3933.2007.00355.x | null | astro-ph | null | We have used the Sydney University Stellar Interferometer (SUSI) to measure
the angular diameter of beta Hydri. This star is a nearby G2 subgiant whose
mean density was recently measured with high precision using asteroseismology.
We determine the radius and effective temperature of the star to be
1.814+/-0.017 R_sun (0.9%) and 5872+/-44 K (0.7%) respectively. By combining
this value with the mean density, as estimated from asteroseismology, we make a
direct estimate of the stellar mass. We find a value of 1.07+/-0.03 M_sun
(2.8%), which agrees with published estimates based on fitting in the H-R
diagram, but has much higher precision. These results place valuable
constraints on theoretical models of beta Hyi and its oscillation frequencies.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 02:42:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"North",
"J. R.",
""
],
[
"Davis",
"J.",
""
],
[
"Bedding",
"T. R.",
""
],
[
"Ireland",
"M. J.",
""
],
[
"Jacob",
"A. P.",
""
],
[
"O'Byrne",
"J.",
""
],
[
"Owens",
"S. M.",
""
],
[
"Robertson",
"J. G.",
""
],
[
"Tango",
"W. J.",
""
],
[
"Tuthill",
"P. G.",
""
]
] |
0707.0334 | Wan Li Yang | W.L. Yang, C.Y. Chen, and M. Feng | Implementation of three-qubit Grover search in cavity QED | 10 pages, 5 figures | Phys. Rev. A 76 054301 (2007) | 10.1103/PhysRevA.76.054301 | null | quant-ph | null | Using resonant interaction of three Rydberg atoms with a single-mode
microwave cavity, we consider a realization of three-qubit Grover search
algorithm in the presence of weak cavity decay, based on a previous idea for
three-qubit quantum gate [Phys. Rev. A 73, 064304 (2006)]. We simulate the
searching process under the influence of the cavity decay and show that our
scheme could be achieved efficiently to find the marked state with high
fidelity. The required operations are very close to the reach with current
cavity QED techniques.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 02:54:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yang",
"W. L.",
""
],
[
"Chen",
"C. Y.",
""
],
[
"Feng",
"M.",
""
]
] |
0707.0335 | Alexander Vladimirsky | Alexander Vladimirsky | Label-setting methods for Multimode Stochastic Shortest Path problems on
graphs | 20 pages; 7 figures; submitted to "Mathematics of Operations
Research"; minor changes & restructuring in accordance with reviewers'
suggestions | null | null | null | math.OC math.NA | null | Stochastic shortest path (SSP) problems arise in a variety of discrete
stochastic control contexts. An optimal solutions to such a problem is
typically computed using the value function, which can be found by solving the
corresponding dynamic programming equations. In the deterministic case, these
equations can be often solved by the highly efficient label-setting methods
(such as Dijkstra's and Dial's algorithms). In this paper we define and study a
class of Multimode Stochastic Shortest Path problems and develop sufficient
conditions for the applicability of label-setting methods. We illustrate our
approach on a number of discrete stochastic control examples. We also discuss
the relationship of SSPs with discretizations of static Hamilton-Jacobi
equations and provide an alternative derivation for several fast
(non-iterative) numerical methods for these PDEs.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 03:29:57 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Feb 2008 03:24:34 GMT"
}
] | 2008-02-29T00:00:00 | [
[
"Vladimirsky",
"Alexander",
""
]
] |
0707.0336 | Erhan Bayraktar | Erhan Bayraktar | Pricing Options on Defaultable Stocks | Key Words: Option pricing, multiscale perturbation methods,
defaultable stocks, stochastic intensity of default, implied volatility skew | null | null | null | cs.CE | null | In this note, we develop stock option price approximations for a model which
takes both the risk o default and the stochastic volatility into account. We
also let the intensity of defaults be influenced by the volatility. We show
that it might be possible to infer the risk neutral default intensity from the
stock option prices. Our option price approximation has a rich implied
volatility surface structure and fits the data implied volatility well. Our
calibration exercise shows that an effective hazard rate from bonds issued by a
company can be used to explain the implied volatility skew of the implied
volatility of the option prices issued by the same company.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 03:28:35 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Dec 2007 01:08:18 GMT"
}
] | 2007-12-21T00:00:00 | [
[
"Bayraktar",
"Erhan",
""
]
] |
0707.0337 | Pratim Kumar Chattaraj | Pratim Kumar Chattaraj and Santanab Giri | Stability, Reactivity, and Aromaticity of Compounds of a Multivalent
Superatom | 5 pages, 2 figures, 4 tables | null | 10.1021/jp0760758 | null | physics.atm-clus physics.chem-ph | null | In this communication we analyze the stability, reactivity and possible
aromatic behavior of two recently reported clusters (Reveles J. U.; Khanna S.
N.; Roach P. J.; Castleman A. W. jr. Proc. Natl. Acad. Sci, 2006, 103, 18405),
viz., Al7C- and Al7O- in the light of the principles of the maximum hardness
and minimum electrophilicity as well as the nucleus independent chemical shift
values.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 04:38:11 GMT"
}
] | 2016-09-28T00:00:00 | [
[
"Chattaraj",
"Pratim Kumar",
""
],
[
"Giri",
"Santanab",
""
]
] |
0707.0338 | Zindine Djadli | Giovanni Catino and Zindine Djadli | Integral pinched 3-manifolds are space forms | Some misprints in the first version are corrected | null | null | null | math.DG math.AP | null | In this paper we prove that, under an explicit integral pinching assumption
between the $L^2$-norm of the Ricci curvature and the $L^2$-norm of the scalar
curvature, a closed 3-manifold with positive scalar curvature admits an
Einstein metric with positive curvature. In particular this implies that the
manifold is diffeomorphic to a quotient of ${\Bbb S}^3$.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 05:03:24 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 17:38:56 GMT"
}
] | 2007-09-11T00:00:00 | [
[
"Catino",
"Giovanni",
""
],
[
"Djadli",
"Zindine",
""
]
] |
0707.0339 | Adrian P. Gentle | Adrian P. Gentle | The BSSN formulation is a partially constrained evolution system | 8 pages, minor grammatical corrections | International Journal of Modern Physics D, 19 (2010) 153-158 | 10.1142/S0218271810016312 | null | gr-qc | null | Relativistic simulations in 3+1 dimensions typically monitor the Hamiltonian
and momentum constraints during evolution, with significant violations of these
constraints indicating the presence of instabilities. In this paper we rewrite
the momentum constraints as first-order evolution equations, and show that the
popular BSSN formulation of the Einstein equations explicitly uses the momentum
constraints as evolution equations. We conjecture that this feature is a key
reason for the relative success of the BSSN formulation in numerical
relativity.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 05:06:21 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 18:33:09 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Gentle",
"Adrian P.",
""
]
] |
0707.0340 | Brendan McKay | Catherine Greenhill and Brendan D. McKay | Asymptotic enumeration of sparse nonnegative integer matrices with
specified row and column sums | We fixes a small gap in the proof of Lemma 5.1 and made some other
minor corrections. No theorem statements have changed | Advances in Applied Mathematics, 41 (2008) 459-481 | null | null | math.CO math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let \svec = (s_1,...,s_m) and \tvec = (t_1,...,t_n) be vectors of nonnegative
integer-valued functions of m,n with equal sum S = sum_{i=1}^m s_i =
sum_{j=1}^n t_j. Let M(\svec,\tvec) be the number of m*n matrices with
nonnegative integer entries such that the i-th row has row sum s_i and the j-th
column has column sum t_j for all i,j. Such matrices occur in many different
settings, an important example being the contingency tables (also called
frequency tables) important in statistics. Define s=max_i s_i and t=max_j t_j.
Previous work has established the asymptotic value of M(\svec,\tvec) as
m,n\to\infty with s and t bounded (various authors independently, 1971-1974),
and when \svec,\tvec are constant vectors with m/n,n/m,s/n >= c/log n for
sufficiently large (Canfield and McKay, 2007). In this paper we extend the
sparse range to the case st=o(S^(2/3)). The proof in part follows a previous
asymptotic enumeration of 0-1 matrices under the same conditions (Greenhill,
McKay and Wang, 2006). We also generalise the enumeration to matrices over any
subset of the nonnegative integers that includes 0 and 1.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 05:09:54 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Feb 2008 01:17:00 GMT"
},
{
"version": "v3",
"created": "Mon, 16 Apr 2012 07:16:37 GMT"
}
] | 2012-04-17T00:00:00 | [
[
"Greenhill",
"Catherine",
""
],
[
"McKay",
"Brendan D.",
""
]
] |
0707.0341 | Takashi Tamaki | Takashi Tamaki | Considering boundary conditions for black hole entropy in loop quantum
gravity | 4 pages, final version to be published in CQG | Class.Quant.Grav.24:3837-3842,2007 | 10.1088/0264-9381/24/15/005 | null | hep-th gr-qc | null | We argue for black hole entropy in loop quantum gravity (LQG) by taking into
account the interpretation that there is no other side of the horizon. This
gives new values for the Barbero-Immirzi parameter which are fairly larger than
those considered before. We also discuss its consequences.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 06:02:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tamaki",
"Takashi",
""
]
] |
0707.0342 | David Abergel | D. S. L. Abergel and Vladimir I. Fal'ko | Spin-orbit-assisted electron-phonon interaction and the magnetophonon
resonance in semiconductor quantum wells | Four pages, RevTex, three figures, updated references | null | 10.1103/PhysRevB.77.035317 | null | cond-mat.mes-hall | null | We introduce a spin-orbit assisted electron-phonon (e-ph) coupling mechanism
for carriers in semiconductor quantum wells and predict qualitatively the form
and shape of anticrossings between the cyclotron resonance (CR) and optical (LO
and TO) phonons. Since this e-ph interaction involves the electron spin it
makes the predicted TO-CR anticrossing dependent on the filling factor and
therefore on the polarization of the 2D electron gas in the quantum well.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 06:51:27 GMT"
},
{
"version": "v2",
"created": "Sat, 21 Jul 2007 10:21:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Abergel",
"D. S. L.",
""
],
[
"Fal'ko",
"Vladimir I.",
""
]
] |
0707.0343 | Archil Kobakhidze | Archil Kobakhidze and Bruce H. J. McKellar | Particle interference as a test of Lorentz-violating electrodynamics | 5 pages | Phys.Rev.D76:093004,2007 | 10.1103/PhysRevD.76.093004 | null | hep-ph quant-ph | null | In Lorentz-violating electrodynamics a steady current (and similarly a static
charge) generates both static magnetic and electric fields. These induced
fields, acting on interfering particles, change the interference pattern. We
find that particle interference experiments are sensitive to small Lorentz
violating effects, and thus they can be used to improve current bounds on some
Lorentz-violating parameters.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 07:06:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kobakhidze",
"Archil",
""
],
[
"McKellar",
"Bruce H. J.",
""
]
] |
0707.0344 | Jos\'e Trashorras | Jos\'e Trashorras | Large deviations for symmetrised empirical measures | null | null | null | null | math.PR | null | In this paper we prove a Large Deviation Principle for the sequence of
symmetrised empirical measures $\frac{1}{n} \sum_{i=1}^{n}
\delta_{(X^n_i,X^n_{\sigma_n(i)})}$ where $\sigma_n$ is a random permutation
and $((X_i^n)_{1 \leq i \leq n})_{n \geq 1}$ is a triangular array of random
variables with suitable properties. As an application we show how this result
allows to improve the Large Deviation Principles for symmetrised
initial-terminal conditions bridge processes recently established by Adams,
Dorlas and K\"{o}nig.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 08:27:50 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Sep 2007 20:32:12 GMT"
}
] | 2007-09-13T00:00:00 | [
[
"Trashorras",
"José",
""
]
] |
0707.0345 | Sebastian Bustingorry | S. Bustingorry, A. B. Kolton, T. Giamarchi | Thermal rounding of the depinning transition | 6 pages, 3 figures | Europhys. Lett. 81, 26005 (2008). | 10.1209/0295-5075/81/26005 | null | cond-mat.stat-mech cond-mat.dis-nn | null | We study thermal effects at the depinning transition by numerical simulations
of driven one-dimensional elastic interfaces in a disordered medium. We find
that the velocity of the interface, evaluated at the critical depinning force,
can be correctly described with the power law $v\sim T^\psi$, where $\psi$ is
the thermal exponent. Using the sample-dependent value of the critical force,
we precisely evaluate the value of $\psi$ directly from the temperature
dependence of the velocity, obtaining the value $\psi = 0.15 \pm 0.01$. By
measuring the structure factor of the interface we show that both the
thermally-rounded and the T=0 depinning, display the same large-scale geometry,
described by an identical divergence of a characteristic length with the
velocity $\xi \propto v^{-\nu/\beta}$, where $\nu$ and $\beta$ are respectively
the T=0 correlation and depinning exponents. We discuss the comparison of our
results with previous estimates of the thermal exponent and the direct
consequences for recent experiments on magnetic domain wall motion in
ferromagnetic thin films.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 07:18:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bustingorry",
"S.",
""
],
[
"Kolton",
"A. B.",
""
],
[
"Giamarchi",
"T.",
""
]
] |
0707.0346 | Stubbe Joachim | Ph. Choquard, J. Stubbe | The one-dimensional Schr\"{o}dinger-Newton equations | null | null | 10.1007/s11005-007-0174-y | null | math-ph math.MP | null | We prove an existence and uniqueness result for ground states of
one-dimensional Schr\"{o}dinger-Newton equations.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 07:19:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Choquard",
"Ph.",
""
],
[
"Stubbe",
"J.",
""
]
] |
0707.0347 | Metin Gurses | Metin Gurses | Gauss-Bonnet Gravity with Scalar Field in Four Dimensions | Latex file, 7 pages | null | 10.1007/s10714-007-0579-z | null | gr-qc hep-th | null | We give all exact solutions of the Einstein-Gauss-Bonnet Field Equations
coupled with a scalar field in four dimensions under certain assumptions.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 07:20:31 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 18:22:34 GMT"
},
{
"version": "v3",
"created": "Fri, 13 Jul 2007 10:32:59 GMT"
},
{
"version": "v4",
"created": "Thu, 3 Jan 2008 14:00:31 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Gurses",
"Metin",
""
]
] |
0707.0348 | Ingo Piepers | Ingo Piepers | Self-Organized Characteristics of the International System | Withdrawn. New framework developed in "War: Origins and Effects"
arXiv:1409.6163 | null | null | null | nlin.AO | null | Various self-organized characteristics of the international system can be
identified with the help of a complexity science perspective. The perspective
discussed in this article is based on various complexity science concepts and
theories, and concepts related to ecology and ecosystems. It can be argued that
the Great Power war dynamics of the international system in Europe during the
period 1480-1945, showed self-organized critical (SOC) characteristics,
resulting in a punctuated equilibrium dynamic. It seems that the
SOC-characteristics of the international system and the punctuated equilibrium
dynamic were - in combination with chaotic war dynamics - functional in a
process of social expansion in Europe. According to a model presented in this
article, population growth was a component of the driving force of the
international system during this time frame. The findings of this exploratory
research project contradict with generally held opinions in International
Relations theory.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 14:52:32 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Sep 2014 01:41:13 GMT"
}
] | 2014-09-25T00:00:00 | [
[
"Piepers",
"Ingo",
""
]
] |
0707.0349 | Motohiko Ezawa | Motohiko Ezawa | Metallic Graphene Nanodisks | 6 pages, 10 figures | Physical Review B 76, 245415 (2007) | 10.1103/PhysRevB.76.245415 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | We explore the electronic properties of finite-length graphene nanoribbons as
well as graphene nanodisks with various sizes and shapes in quest of metallic
ones. For this purpose it is sufficient to search zero-energy states. We find
that there exist no zero-energy states in finite-length zigzag nanoribbons
though all infinite-length zigzag nanoribbons have zero-energy states. The
occurrence of zero-energy states is surprisingly rare. Among typical nanodisks,
only trigonal zigzag nanodisks have degenerate zero-energy states and show
metallic ferromagnetism, where the degeneracy can be controlled arbitrarily by
designing the size. A remarkable property is that the relaxation time is quite
large in spite of its small size in trigonal zigzag nanodisks.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 07:31:14 GMT"
}
] | 2007-12-15T00:00:00 | [
[
"Ezawa",
"Motohiko",
""
]
] |
0707.0350 | Eugene Kamenetskii | M. Sigalov, E. Kamenetskii, and R. Shavit | A new concept and design of ferrite-based microwave vortex devices | null | null | null | null | physics.class-ph | null | In microwave resonant systems with ferrite samples, one becomes faced with
specific phase relations for the electromagnetic fields. Such specific phase
relations may lead to appearance of nontrivial states: electromagnetic
vortices. This paper provides some general ideas and design principles for
microwave devices with the field vortex structures.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 07:51:19 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Sigalov",
"M.",
""
],
[
"Kamenetskii",
"E.",
""
],
[
"Shavit",
"R.",
""
]
] |
0707.0351 | Ivanov Dmitry | M. Diehl and D.Yu. Ivanov | Dispersion representations for hard exclusive processes | 24 pages | Eur.Phys.J.C52:919-932,2007 | 10.1140/epjc/s10052-007-0401-9 | DESY 07-094 | hep-ph | null | Several hard exclusive scattering processes admit a description in terms of
generalized parton distributions and perturbative hard-scattering kernels. Both
the physical amplitude and the hard-scattering kernels fulfill dispersion
relations. We give a detailed investigation of their consistency at all orders
in perturbation theory. The results shed light on the information about
generalized parton distributions that can be extracted from the real and
imaginary parts of exclusive amplitudes. They also provide a practical
consistency check for models of these distributions in which Lorentz invariance
is not exactly satisfied.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 07:31:53 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Diehl",
"M.",
""
],
[
"Ivanov",
"D. Yu.",
""
]
] |
0707.0352 | Yusuke Konishi | Yusuke Konishi, Hiroko Tokoro, Masamichi Nishino, Seiji Miyashita | Monte Carlo simulation of pressure-induced phase transitions in
spin-crossover materials | 5 pages, 6 figures | Phys. Rev. Lett. 100, 067206 (2008) | 10.1103/PhysRevLett.100.067206 | null | cond-mat.mtrl-sci cond-mat.stat-mech | null | Pressure-induced phase transitions of spin-crossover materials were simulated
by a Monte Carlo simulation in the constant pressure ensemble for the first
time. Here, as the origin of the cooperative interaction, we adopt elastic
interaction among the distortions of the lattice due to the difference of the
molecular sizes in different spin states, i.e., the high spin (HS) state and
the low spin (LS) state. We studied how the temperature dependence of the
ordering process changes with the pressure, and we obtained a standard sequence
of temperature dependences that has been found in changing other parameters
such as strength of the ligand field (S. Miyashita et al., Prog. Theor. Phys.
\textbf{114}, 719 (2005)). Various effects of pressure on the spin-crossover
ordering process are examined from a unified point of view.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 08:12:34 GMT"
}
] | 2008-04-09T00:00:00 | [
[
"Konishi",
"Yusuke",
""
],
[
"Tokoro",
"Hiroko",
""
],
[
"Nishino",
"Masamichi",
""
],
[
"Miyashita",
"Seiji",
""
]
] |
0707.0353 | Motohiko Ezawa | Motohiko Ezawa | Intrinsic Zeeman Effect in Graphene | 24 pages, 9 figures, to appear in J. Phys. Soc. Jpn | J. Phys. Soc. Jpn. 76 (2007) 094701 | 10.1143/JPSJ.76.094701 | null | cond-mat.mes-hall cond-mat.str-el | null | The intrinsic Zeeman energy is precisely one half of the cyclotron energy for
electrons in graphene. As a result a Landau-level mixing occurs to create the
energy spectrum comprised of the $4j$-fold degenerated zero-energy level and
4-fold degenerated nonzero-energy levels in the $j$-layer graphene, where
$j=1,2,3$ for monolayer, bilayer and trilayer, respectively. The degeneracy
manifests itself in the quantum Hall (QH) effect. We study how the degeneracy
is removed by the Coulomb interactions. With respect to the zero-energy level,
an excitonic gap opens by making a BCS-type condensation of electron-hole pairs
at the filling factor $\nu =0$. It gives birth to the Ising QH ferromagnet at
$\nu =\pm 1$ for monolayer, $\nu =\pm 1,\pm 3$ for bilayer, and $\nu =\pm 1,\pm
3,\pm 5$ for trilayer graphene from the zero-energy degeneracy. With respect to
the nonzero-energy level, a remarkable consequence is derived that the
effective Coulomb potential depends on spins, since a single energy level
contains up-spin and down-spin electrons belonging to different Landau levels.
The spin-dependent Coulomb interaction leads to the valley polarization at $\nu
=\pm 4, \pm 8, \pm 12, ...$ for monolayer, $\nu =\pm 2, \pm 6, \pm 10, >...$
for bilayer, and $\nu =\pm 2,\pm 4, \pm 8, \pm 12, ...$ for trilayer graphene.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 07:41:44 GMT"
}
] | 2007-08-29T00:00:00 | [
[
"Ezawa",
"Motohiko",
""
]
] |
0707.0354 | Jerome Margueron | J. Margueron (IPNO), E. Van Dalen (ECM), C. Fuchs (ITP) | Low densities in asymmetric nuclear matter | Version2, Paper + figures included, PTH | Phys.Rev.C76:034309,2007 | 10.1103/PhysRevC.76.034309 | null | nucl-th | null | Asymmetric nuclear matter is investigated in the low density region below the
nuclear saturation density. Microscopic calculations based on the Dirac
Brueckner Hartree-Fock (DBHF) approach with realistic nucleon-nucleon
potentials are used to adjust a low density functional. This functional is
constructed on a density expansion of the relativistic mean field theory which
allows a clear interpretation of the role of the mesons to the equation of
state. It is shown that a correction term should be added to the functional in
order to take into account the effects beyond the mean field. Two functionals
with different corrections are obtained. Those functionals converge to predict
a reduction of the spinodal zone in asymmetric nuclear matter by about 15-20%
and an isoscalar unstable mode closer to the constant Z/A direction than the
functional without correction.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 07:45:04 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Sep 2007 08:24:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Margueron",
"J.",
"",
"IPNO"
],
[
"Van Dalen",
"E.",
"",
"ECM"
],
[
"Fuchs",
"C.",
"",
"ITP"
]
] |
0707.0355 | Tsuyoshi Inoue | Tsuyoshi Inoue and Shu-ichiro Inutsuka | Evolutionary Conditions in the Dissipative MHD System Revisited | 13 pages, 4 figures, accepted for publication in Prog. Theor. Phys | Prog.Theor.Phys.118:47-58,2007 | 10.1143/PTP.118.47 | null | astro-ph | null | The evolutionary conditions for the dissipative continuous
magnetohydrodynamic (MHD) shocks are studied. We modify Hada's approach in the
stability analysis of the MHD shock waves. The matching conditions between
perturbed shock structure and asymptotic wave modes shows that all types of the
MHD shocks, including the intermediate shocks, are evolutionary and perturbed
solutions are uniquely defined. We also adopt our formalism to the MHD shocks
in the system with resistivity without viscosity, which is often used in
numerical simulation, and show that all types of shocks that are found in the
system satisfy the evolutionary condition and perturbed solutions are uniquely
defined. These results suggest that the intermediate shocks may appear in
reality.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 07:51:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Inoue",
"Tsuyoshi",
""
],
[
"Inutsuka",
"Shu-ichiro",
""
]
] |
0707.0356 | Jochum van der Bij | J.J. van der Bij | No Higgs at the LHC ?! A case for the ILC | 9 pages; Contribution to the 2007 ILCWS, Hamburg (2007) | ECONF C0705302:TEV10,2007 | null | null | hep-ph | null | I discuss the question whether it is possible that the LHC will find no
signal for the Higgs particle. It is argued that in this case singlet scalars
should be present that could play an important role in astroparticle physics. A
critical view at the existing electroweak data shows that this possibility
might be favored over the simplest standard model. In this case one needs the
ILC in order to study the Higgs sector.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 07:55:13 GMT"
}
] | 2009-02-16T00:00:00 | [
[
"van der Bij",
"J. J.",
""
]
] |
0707.0357 | Taekyung Kim Mr. | Inyong Cho, Taekyung Kim, Yoonbai Kim, Kyungha Ryu | Relativistic Dynamics of Multi-BPS D-vortices and Straight BPS D-strings | 18 pages, 3 figures. Changes for the analysis of scattering and minor
changes have been made. 1 figure has been replaced | Phys.Lett.B666:502-510,2008 | 10.1016/j.physletb.2008.08.006 | null | hep-th astro-ph | null | Moduli space dynamics of multi-D-vortices from D2${\bar {\rm D}}$
(equivalently, parallel straight D-strings from D3${\bar {\rm D}}$3) is
systematically studied. For the BPS D-vortices, we show through exact
calculations that the classical motion of randomly-distributed $n$ D-vortices
is governed by a relativistic Lagrangian of free massive point-particles. When
the head-on collision of two identical BPS D-vortices of zero radius is
considered, it predicts either 90${}^{\circ}$ scattering or 0${}^{\circ}$
scattering equivalent to 180${}^{\circ}$ scattering. Since the former leads to
a reconnection of two identical D-strings and the latter does to a case of
their passing through each other, two possibilities are consistent with the
prediction of string theory. It is also shown that the force between two
non-BPS vortices is repulsive. Although the obtained moduli space dynamics of
multi-BPS-D-vortices is exact in classical regime, the quantum effect of an
F-string pair production should be included in determining the probabilities of
the reconnection and the passing through for fast-moving cosmic superstrings.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 09:05:55 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Jan 2008 14:44:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cho",
"Inyong",
""
],
[
"Kim",
"Taekyung",
""
],
[
"Kim",
"Yoonbai",
""
],
[
"Ryu",
"Kyungha",
""
]
] |
0707.0358 | Alexander Zhuravel | Alexander P. Zhuravel, Steven M. Anlage, Stephen Remillard, Alexey V.
Ustinov | Spatial correlation of linear and nonlinear electron transport in
superconducting microwave resonator: laser scanning microscopy analysis | 3 pages, 3 figures, submitted to MSMW-07 Symposium Proceedings | MSMW'07 Symposium Proceedings, Kharkov, Ukraine, June 25-30, 2007 | 10.1109/MSMW.2007.4294677 | null | cond-mat.supr-con cond-mat.mtrl-sci | null | Spatially-resolved techniques of laser scanning microscopy (LSM) have been
used to image simultaneously the spatial variations of (i) rf current flow,
J$_RF$(x,y), of (ii) areas of resistive dissipation and (iii) the sources of
microwave nonlinearity (NL) in an operating superconducting resonator. The RF
power dependent spatial evolution of these linear and NL microwave properties
in the meander strip YBCO/LAO superconducting resonator have been LSM probed at
different temperatures below Tc. The influence of both topologies of the
twin-domain YBCO structure and of J$_RF$(x,y) peaks at the edges of
superconducting strip line on its NL properties was analyzed in detail with a
micron-scale spatial resolution. Result shows the resistive origin of the
dominant sources of microwave NLs
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 08:02:25 GMT"
}
] | 2009-09-14T00:00:00 | [
[
"Zhuravel",
"Alexander P.",
""
],
[
"Anlage",
"Steven M.",
""
],
[
"Remillard",
"Stephen",
""
],
[
"Ustinov",
"Alexey V.",
""
]
] |
0707.0359 | Jochum van der Bij | J.J. van der Bij | SM scalar and extra singlet(s) | 8 pages; Contribution to the XLII Rencontre de Moriond, Electroweak
interactions and unified theories, La Thuile (2007) | null | null | null | hep-ph | null | I discuss the question whether it is possible that the LHC will find no
signal for the Higgs boson. It is argued that in this case singlet scalars
should be present that could play an important role in astroparticle physics. A
critical view at the existing electroweak data shows that this possibility
might be favored over the simplest standard model. In this case one needs the
ILC in order to study the Higgs sector.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 08:06:44 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"van der Bij",
"J. J.",
""
]
] |
0707.0360 | Xavier Moya | Thorsten Krenke, Eyup Duman, Mehmet Acet, Xavier Moya, Lluis Manosa,
and Antoni Planes | Effect of Co and Fe on the inverse magnetocaloric properties of Ni-Mn-Sn | 5 pages, 7 figures. Accepted for publication in the Journal of
Applied Physics | null | 10.1063/1.2761853 | null | cond-mat.mtrl-sci | null | At certain compositions Ni-Mn-$X$ Heusler alloys ($X$: group IIIA-VA
elements) undergo martensitic transformations, and many of them exhibit inverse
magnetocaloric effects. In alloys where $X$ is Sn, the isothermal entropy
change is largest among the Heusler alloys, particularly in
Ni$_{50}$Mn$_{37}$Sn$_{13}$ where it reaches a value of 20 Jkg$^{-1}$K$^{-1}$
for a field of 5T. We substitute Ni with Fe and Co in this alloy, each in
amounts of 1 at% and 3 at% to perturb the electronic concentration and examine
the resulting changes in the magnetocaloric properties. Increasing both Fe and
Co concentrations causes the martensitic transition temperature to decrease,
whereby the substitution by Co at both compositions or substituting 1 at% Fe
leads to a decrease in the magnetocaloric effect. On the other hand, the
magnetocaloric effect in the alloy with 3 at% Fe leads to an increase in the
value of the entropy change to about 30 Jkg$^{-1}$K$^{-1}$ at 5T.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 08:24:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Krenke",
"Thorsten",
""
],
[
"Duman",
"Eyup",
""
],
[
"Acet",
"Mehmet",
""
],
[
"Moya",
"Xavier",
""
],
[
"Manosa",
"Lluis",
""
],
[
"Planes",
"Antoni",
""
]
] |
0707.0361 | David H. Lyth | David H. Lyth | The curvature perturbation in a box | as published | JCAP0712:016,2007 | 10.1088/1475-7516/2007/12/016 | null | astro-ph gr-qc hep-ph hep-th | null | The stochastic properties of cosmological perturbations are best defined
through the Fourier expansion in a finite box. I discuss the reasons for that
with reference the curvature perturbation, and explore some issues arising from
it.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 08:42:04 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Feb 2008 09:24:03 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lyth",
"David H.",
""
]
] |
0707.0362 | Manfred Hartl | Manfred Hartl | On Fox and augmentation quotients of semidirect products | 39 pages; paper thoroughly revised: notation and presentation
improved, many details and new result added (Theorem 1.7) | J. Algebra 324 (12) (2010), 3276-3307 | null | LAMAV Preprint 07/12 | math.GR math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $G$ be a group which is the semidirect product of a normal subgroup $N$
and some subgroup $T$. Let $I^n(G)$, $n\ge 1$, denote the powers of the
augmentation ideal $I(G)$ of the group ring $\Z(G)$. Using homological methods
the groups $Q_n(G,H) = I^{n-1}(G)I(H)/I^{n}(G)I(H)$, $H=G,N,T$, are
functorially expressed in terms of enveloping algebras of certain Lie rings
associated with $N$ and $T$, in the following cases: for $n\le 4$ and arbitrary
$G,N,T$ (except from one direct summand of $Q_4(G,N)$), and for all $n\ge 2$ if
certain filtration quotients of $N$ and $T$ are torsionfree.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 08:53:54 GMT"
},
{
"version": "v2",
"created": "Fri, 30 Apr 2010 09:37:06 GMT"
}
] | 2011-07-12T00:00:00 | [
[
"Hartl",
"Manfred",
""
]
] |
0707.0363 | E. Khan | E. Khan, M. Grasso, J. Margueron, N. Van Giai | Detecting bubbles in exotic nuclei | 6 pages, 5 figures, to be published in Nucl. Phys. A | Nucl.Phys.A800:37-46,2008 | 10.1016/j.nuclphysa.2007.11.012 | null | nucl-th nucl-ex | null | The occurrence of a bubble, due to an inversion of s$_{1/2}$ state with the
state usually located above, is investigated. Proton bubbles in neutron-rich
Argon isotopes are optimal candidates. Pairing effects which can play against
the bubble formation are evaluated. They cannot prevent bubble formation in
very neutron-rich argon isotopes such as $^{68}$Ar. This pleads for a
measurement of the charge density of neutron-rich argon isotopes in the
forthcoming years, with the advent of electron scattering experiments in next
generation exotic beam facilities such as FAIR or RIBF.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 08:56:57 GMT"
},
{
"version": "v2",
"created": "Mon, 26 Nov 2007 16:07:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Khan",
"E.",
""
],
[
"Grasso",
"M.",
""
],
[
"Margueron",
"J.",
""
],
[
"Van Giai",
"N.",
""
]
] |
0707.0364 | Herbert Lange | Vassil Kanev, Herbert Lange | Polarization types of isogenous Prym-Tyurin varieties | 28 pages | null | null | null | math.AG | null | Let p:C-->Y be a covering of smooth, projective curves which is a composition
of \pi:C-->C' of degree 2 and g:C'-->Y of degree n. Let f:X-->Y be the covering
of degree 2^n, where the curve X parametrizes the liftings in C^{(n)} of the
fibers of g:C'-->Y. Let P(X,\delta) be the associated Prym-Tyurin variety,
known to be isogenous to the Prym variety P(C,C'). Most of the results in the
paper focus on calculating the polarization type of the restriction of the
canonical polarization of JX on P(X,\delta). We obtain the polarization type
when n=3. When Y=P^1 we conjecture that P(X,\delta) is isomorphic to the dual
of the Prym variety P(C,C'). This was known when n=2, we prove it when n=3, and
for arbitrary n if \pi:C-->C' is \'{e}tale. Similar results are obtained for
some other types of coverings.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 08:59:19 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Kanev",
"Vassil",
""
],
[
"Lange",
"Herbert",
""
]
] |
0707.0365 | Jean-Christophe Dubacq | Heithem Abbes (UTIC), Christophe C\'erin (LIPN), Jean-Christophe
Dubacq (LIPN), Mohamed Jemni (UTIC) | Performance Analysis of Publish/Subscribe Systems | null | Rapport Interne LIPN (15/05/2007) | null | null | cs.DC | null | The Desktop Grid offers solutions to overcome several challenges and to
answer increasingly needs of scientific computing. Its technology consists
mainly in exploiting resources, geographically dispersed, to treat complex
applications needing big power of calculation and/or important storage
capacity. However, as resources number increases, the need for scalability,
self-organisation, dynamic reconfigurations, decentralisation and performance
becomes more and more essential. Since such properties are exhibited by P2P
systems, the convergence of grid computing and P2P computing seems natural. In
this context, this paper evaluates the scalability and performance of P2P tools
for discovering and registering services. Three protocols are used for this
purpose: Bonjour, Avahi and Free-Pastry. We have studied the behaviour of
theses protocols related to two criteria: the elapsed time for registrations
services and the needed time to discover new services. Our aim is to analyse
these results in order to choose the best protocol we can use in order to
create a decentralised middleware for desktop grid.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 09:02:45 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Abbes",
"Heithem",
"",
"UTIC"
],
[
"Cérin",
"Christophe",
"",
"LIPN"
],
[
"Dubacq",
"Jean-Christophe",
"",
"LIPN"
],
[
"Jemni",
"Mohamed",
"",
"UTIC"
]
] |
0707.0366 | Sung Ho Wang | Sung Ho Wang | Willmore Legendrian surfaces in pseudoconformal 5-sphere | 24 pages | null | null | null | math.DG math.AP | null | Let $ X: M \hook S^5$ be a compact Legendrian surface in pseudoconformal(CR)
5-sphere. We introduce a pseudoconformally invariant Willmore type second order
functional $ \W(X)$, and study its critical points called Willmore Legendrian
surfaces. The fifth order structure equations show that Willmore dual can be
defined for a class of Willmore Legendrian surfaces. Moreover when this dual is
constant, Willmore Legendrian surface admits a Weierstra\ss type representation
in terms of immersed meromorphic curve in $ \C^2$ satisfying an appropriate
real period condition via pseudoconformal stereographic projection. We show
that every compact Riemann surface admits a generally one to one, conformal,
Willmore Legendrian immersion in $ S^5$ with constant Willmore dual. As a
corollary, every compact Riemann surface can be conformally immersed in $ \C^2$
as an exact, algebraic Lagrangian surface.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 09:20:48 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Wang",
"Sung Ho",
""
]
] |
0707.0367 | Nizar Demni | Nizar Demni (PMA) | Radial Dunkl Processes : Existence and uniqueness, Hitting time, Beta
Processes and Random Matrices | 33 pages | null | null | null | math.PR | null | We begin with the study of some properties of the radial Dunkl process
associated to a reduced root system $R$. It is shown that this diffusion is the
unique strong solution for all $t \geq 0$ of a SDE with singular drift. Then,
we study $T_0$, the first hitting time of the positive Weyl chamber : we prove,
via stochastic calculus, a result already obtained by Chybiryakov on the
finiteness of $T_0$. The second and new part deals with the law of $T_0$ for
which we compute the tail distribution, as well as some insight via stochastic
calculus on how root systems are connected with eigenvalues of standard
matrix-valued processes. This gives rise to the so-called $\beta$-processes.
The ultraspherical $\beta$-Jacobi case still involves a reduced root system
while the general case is closely connected to a non reduced one. This process
lives in a convex bounded domain known as principal Weyl alcove and the strong
uniqueness result remains valid. The last part deals with the first hitting
time of the alcove's boundary and the semi group density which enables us to
answer some open questions.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 09:09:03 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Demni",
"Nizar",
"",
"PMA"
]
] |
0707.0368 | Salvatore Capozziello | S. Capozziello, Ch. Corda, M De Laurentis | Stochastic background of relic scalar gravitational waves from
scalar-tensor gravity | 7 pages, 1 figure | Mod.Phys.Lett.A22:2647-2655,2007 | 10.1142/S021773230702573X | null | gr-qc | null | A stochastic background of relic gravitational waves is achieved by the so
called adiabatically-amplified zero-point fluctuations process derived from
early inflation. In principle, it provides a distinctive spectrum of relic
gravitational waves. In the framework of scalar-tensor gravity, we discuss the
scalar modes of gravitational waves and the primordial production of this
scalar component which is generated beside tensorial one. We discuss also the
upper limit for such a relic scalar component with respect to the WMAP
constraints.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 09:11:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Capozziello",
"S.",
""
],
[
"Corda",
"Ch.",
""
],
[
"De Laurentis",
"M",
""
]
] |
0707.0369 | Petr A. Nikrityuk | P.A. Nikrityuk, K. Eckert, R. Grundmann | Numerical study of the influence of an applied electrical potential on
the solidification of a binary metal alloy | 13 pages, Con. Cast Conf, Ulm 2005, Germany | null | null | null | cond-mat.mtrl-sci cond-mat.other | null | In this work we study numerically the influence of a homogeneous electrical
field on the fluid and heat transfer phenomena at macroscale and mesoscale
during unidirectional solidification of a binary metal alloy. The numerical
results showed that a pulse electric discharging applied perpendicularly to the
solidification front leads to a much stronger Joule heating of the liquid phase
in comparison to the solid phase. It was found that on the mesoscopic scale the
electric current density is not homogeneous due to the complex shape of the
dendrite and the difference between electrical conductivities of the solid and
liquid phases. This inhomogeneity of the electrical current density in the
mushy zone leads to the increase of the Joule heating of the dendrite in
comparison to the interdendritic liquid and induces a pinch force
(electromagnetic Lorentz force). The main features of the resulting convection
in the interdendritic liquid are discussed.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 09:14:07 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Nikrityuk",
"P. A.",
""
],
[
"Eckert",
"K.",
""
],
[
"Grundmann",
"R.",
""
]
] |
0707.0370 | Bernhard Urbaszek | B. Urbaszek, P.-F. Braun, X. Marie, O. Krebs, A. Lemaitre, P. Voisin
and T. Amand | Efficient dynamical nuclear polarization in quantum dots: Temperature
dependence | 5 pages, 3 figures | Physical Review B 76, 201301 (R) (2007) | 10.1103/PhysRevB.76.201301 | null | cond-mat.other | null | We investigate in micro-photoluminescence experiments the dynamical nuclear
polarization in individual InGaAs quantum dots. Experiments carried out in an
applied magnetic field of 2T show that the nuclear polarization achieved
through the optical pumping of electron spins is increasing with the sample
temperature between 2K and 55K, reaching a maximum of about 50%. Analysing the
dependence of the Overhauser shift on the spin polarization of the optically
injected electron as a function of temperature enables us to identify the main
reasons for this increase.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 09:14:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Urbaszek",
"B.",
""
],
[
"Braun",
"P. -F.",
""
],
[
"Marie",
"X.",
""
],
[
"Krebs",
"O.",
""
],
[
"Lemaitre",
"A.",
""
],
[
"Voisin",
"P.",
""
],
[
"Amand",
"T.",
""
]
] |
0707.0371 | Manfred Hartl | Manfred Hartl | Quadratic maps between groups | 22 pages; added references; relation with the literature updated and
extended | Georgian Math. J. 16 (2009), no. 1, 55-74 | null | LAMAV Preprint 07/13 | math.GR math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The notion of quadratic maps between arbitrary groups appeared at several
places in the literature on quadratic algebra. Here a unified extensive
treatment of their properties is given; the relation with a relative version of
Passi's polynomial maps and groups of degree 2 is established and used to study
the structure of the latter.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 09:14:56 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jul 2007 19:15:38 GMT"
},
{
"version": "v3",
"created": "Wed, 10 Sep 2008 17:54:36 GMT"
}
] | 2011-07-12T00:00:00 | [
[
"Hartl",
"Manfred",
""
]
] |
0707.0372 | Carlos T. Simpson | Jaya N. Iyer (IMSC, Ias), Carlos T. Simpson (JAD) | Regulators of canonical extensions are torsion: the smooth divisor case | null | null | null | null | math.AG | null | In this paper, we prove a generalization of Reznikov's theorem which says
that the Chern-Simons classes and in particular the Deligne Chern classes (in
degrees $>1$) are torsion, of a flat bundle on a smooth complex projective
variety. We consider the case of a smooth quasi--projective variety with an
irreducible smooth divisor at infinity. We define the Chern-Simons classes of
Deligne's canonical extension of a flat vector bundle with unipotent monodromy
at infinity, which lift the Deligne Chern classes and prove that these classes
are torsion.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 09:25:48 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 12:45:54 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Iyer",
"Jaya N.",
"",
"IMSC, Ias"
],
[
"Simpson",
"Carlos T.",
"",
"JAD"
]
] |
0707.0373 | Collaboration Secretariat Opal | The OPAL collaboration, et al | Search for invisibly decaying Higgs bosons in e+e- -> Zoho production at
sqrt(s) = 183 - 209 GeV | 20 pages, 6 figures, Submitted to Phys. Letts. B | Phys.Lett.B682:381-390,2010 | 10.1016/j.physletb.2009.09.010 | CERN-PH-EP/2007-018 | hep-ex | null | A search is performed for Higgs bosons decaying into invisible final states,
produced in association with a Zo boson in e+e- collisions at energies between
183 and 209 GeV. The search is based on data samples collected by the OPAL
detector at LEP corresponding to an integrated luminosity of about 660 pb-1.
The analysis aims to select events containing the hadronic decay products of
the Zo boson and large missing momentum, as expected from Higgs boson decay
into a pair of stable weakly interacting neutral particles, such as the
lightest neutralino in the Minimal Supersymmetric Standard Model. The same
analysis is applied to a search for nearly invisible Higgs boson cascade decays
into stable weakly interacting neutral particles. No excess over the expected
background from Standard Model processes is observed. Limits on the production
of invisibly decaying Higgs bosons produced in association with a Zo boson are
derived. Assuming a branching ratio BR(ho->invisible)=1, a lower limit of 108.2
GeV is placed on the Higgs boson mass at the 95% confidence level. Limits on
the production of nearly invisibly decaying Higgs bosons are also obtained.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 09:32:48 GMT"
}
] | 2009-12-22T00:00:00 | [
[
"The OPAL collaboration",
"",
""
]
] |
0707.0374 | Alessandro Bertolini | A. Bertolini | Vibration diagnostics instrumentation for ILC | 7 pages, 6 figures, this is a review article which will appear in a
special issue of Measurement Science and Technology on high energy particle
accelerator technology | Measur.Sci.Tech.18:2293-2298,2007 | 10.1088/0957-0233/18/8/002 | DESY-07-095 | physics.ins-det physics.acc-ph | null | The future e-e+ 500 GeV International Linear Collider will rely on
unprecedented nanometer scale particle beam size at the interaction point, in
order to achieve the design luminosity. Tight tolerances on static and dynamic
alignment of the accelerator cavities and optical components are demanded to
transport and focus the high energy electron and positron beams with reasonable
position jitter and low emittance. A brief review of techniques and devices
evaluated and developed so far for the vibration diagnostics of the machine is
presented in this paper.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 09:39:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bertolini",
"A.",
""
]
] |
0707.0375 | Juan Jose Palacios | F. Munoz-Rojas, J. Fernandez-Rossier, L. Brey, and J. J. Palacios | Performance limits of graphene-ribbon-based field effect transistors | 5 pages, 4 figures | Phys. Rev. B 77, 045301 (2008) | 10.1103/PhysRevB.77.045301 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | The performance of field effect transistors based on an single graphene
ribbon with a constriction and a single back gate are studied with the help of
atomistic models. It is shown how this scheme, unlike that of traditional
carbon-nanotube-based transistors, reduces the importance of the specifics of
the chemical bonding to the metallic electrodes in favor of the carbon-based
part of device. The ultimate performance limits are here studied for various
constriction and metal-ribbon contact models. In particular we show that, even
for poorly contacting metals, properly taylored constrictions can give
promising values for both the on-conductance and the subthreshold swing.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 09:52:41 GMT"
}
] | 2014-04-09T00:00:00 | [
[
"Munoz-Rojas",
"F.",
""
],
[
"Fernandez-Rossier",
"J.",
""
],
[
"Brey",
"L.",
""
],
[
"Palacios",
"J. J.",
""
]
] |
0707.0376 | Mario Milman | Joaquim Martin, Mario Milman | Self Improving Sobolev-Poincare Inequalities, Truncation and
Symmetrization | null | Potential Analysis (2008) ; Volume 29, Number 4; Pages 391-408 | 10.1007/s11118-008-9102-8 | null | math.FA math.AP | null | In a previous paper we developed a new method to obtain symmetrization
inequalities of Sobolev type for functions in $W_{0}^{1,1}(\Omega)$. In this
paper we extend our method to Sobolev functions that do not vanish at the
boundary.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:01:52 GMT"
}
] | 2008-11-04T00:00:00 | [
[
"Martin",
"Joaquim",
""
],
[
"Milman",
"Mario",
""
]
] |
0707.0377 | Pawel Danielewicz | P. Danielewicz (NSCL/Msu) | Analysis of Emission Shapes | 9 pages, 3 figures, contribution to the 23rd Winter Workshop on
Nuclear Dynamics, February 11-18, 2007, Big Sky, Montana, USA | null | null | null | nucl-th | null | Shapes of relative emission sources can be accessed by expanding shapes of
correlations at low relative velocities in pair center of mass in Cartesian
harmonics. Coefficients of expansion for correlations are related to the
respective coefficients of expansion for the sources through one dimensional
integral transforms involving properties of pair relative wavefunctions. The
methodology is illustrated with analyses of NA49 and PHENIX correlation data.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:04:18 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Danielewicz",
"P.",
"",
"NSCL/Msu"
]
] |
0707.0378 | Enrico Nardi | Enrico Nardi, Juan Racker and Esteban Roulet | CP violation in scatterings, three body processes and the Boltzmann
equations for leptogenesis | 24 pages, 6 figures. One appendix added. Some numerical results and
corresponding figures (mainly fig. 3) corrected. Final version to be
published in JHEP | JHEP0709:090,2007 | 10.1088/1126-6708/2007/09/090 | null | hep-ph | null | We obtain the Boltzmann equations for leptogenesis including decay and
scattering processes with two and three body initial or final states. We
present an explicit computation of the CP violating scattering asymmetries. We
analyze their possible impact in leptogenesis, and we discuss the validity of
their approximate expressions in terms of the decay asymmetry. In scenarios in
which the initial heavy neutrino density vanishes, the inclusion of CP
asymmetries in scatterings can enforce a cancellation between the lepton
asymmetry generated at early times and the asymmetry produced at later times.
We argue that a sizeable amount of washout is crucial for spoiling this
cancellation, and we show that in the regimes in which the washouts are
particularly weak, the inclusion of CP violation in scatterings yields a
reduction in the final value of the lepton asymmetry. In the strong washout
regimes the inclusion of CP violation in scatterings still leads to a
significant enhancement of the lepton asymmetry at high temperatures; however,
due to the independence from the early conditions that is characteristic of
these regimes, the final value of the lepton asymmetry remains approximately
unchanged.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:07:46 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Sep 2007 16:47:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nardi",
"Enrico",
""
],
[
"Racker",
"Juan",
""
],
[
"Roulet",
"Esteban",
""
]
] |
0707.0379 | Yevgenya Pashayan-Leroy T | A. Sargsyan, D. Sarkisyan, Y. Pashayan-Leroy, C. Leroy, P. Moroshkin,
A. Weis | Dependence of Resonant Absorption Linewidth on Atomic Vapour Column
Thickness for D1 Line of Cs Atoms Confined in Nano-Cell | 13 pages | null | null | null | physics.atom-ph | null | A new nano-cell with smoothly varying longitudinal thickness of the atomic
vapour layer L in the range of 350 - 5100 nm allowing to study the resonant
absorption of D1 and D2 lines of Cs atoms for thicknesses changing from L =
Lambda/2 to L = 6 Lambda with the step of Lambda/2 (Lambda = 852 nm or 894 nm
are the resonant laser wavelengths) and for different intensities is developed.
It is revealed that for low laser intensities there is narrowing of the
resonant absorption spectrum for the thicknesses L = (2n + 1)Lambda/2 (where n
is an integer) up to L = 7Lambda /2 and broadening of the spectrum for L = n
Lambda. For relatively high laser intensity (>1 mW/cm2), velocity selective
optical pumping/saturated resonances of a reduced absorption (with the
line-width close to the natural one), and centred on the hyperfine transitions
occur when L = n Lambda. The possible application of these resonance peaks is
given. The developed theoretical model describes well the experiment.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:09:51 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 10:54:43 GMT"
},
{
"version": "v3",
"created": "Sun, 8 Jul 2007 09:17:11 GMT"
},
{
"version": "v4",
"created": "Thu, 16 Aug 2007 21:33:46 GMT"
},
{
"version": "v5",
"created": "Sun, 30 Dec 2007 21:49:38 GMT"
}
] | 2007-12-30T00:00:00 | [
[
"Sargsyan",
"A.",
""
],
[
"Sarkisyan",
"D.",
""
],
[
"Pashayan-Leroy",
"Y.",
""
],
[
"Leroy",
"C.",
""
],
[
"Moroshkin",
"P.",
""
],
[
"Weis",
"A.",
""
]
] |
0707.0380 | Geraint F. Lewis | Matthew J. Francis, Luke A. Barnes, J. Berian James, Geraint F. Lewis | Expanding Space: the Root of all Evil? | 8 pages, accepted for publication in PASA | Publ.Astron.Soc.Austral.24:95-102,2007 | 10.1071/AS07019 | GFL-001 | astro-ph gr-qc physics.ed-ph | null | While it remains the staple of virtually all cosmological teaching, the
concept of expanding space in explaining the increasing separation of galaxies
has recently come under fire as a dangerous idea whose application leads to the
development of confusion and the establishment of misconceptions. In this
paper, we develop a notion of expanding space that is completely valid as a
framework for the description of the evolution of the universe and whose
application allows an intuitive understanding of the influence of universal
expansion. We also demonstrate how arguments against the concept in general
have failed thus far, as they imbue expanding space with physical properties
not consistent with the expectations of general relativity.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:30:00 GMT"
}
] | 2009-03-19T00:00:00 | [
[
"Francis",
"Matthew J.",
""
],
[
"Barnes",
"Luke A.",
""
],
[
"James",
"J. Berian",
""
],
[
"Lewis",
"Geraint F.",
""
]
] |
0707.0381 | Ansgar Denner | M. Ciccolini, A. Denner, S. Dittmaier | Strong and electroweak corrections to the production of Higgs+2jets via
weak interactions at the LHC | 5 pages, LaTeX, 5 postscript figures | Phys.Rev.Lett.99:161803,2007 | 10.1103/PhysRevLett.99.161803 | MPP-2007-82, PSI-PR-07-03 | hep-ph | null | Radiative corrections of strong and electroweak interactions are presented at
next-to-leading order for the production of a Higgs boson plus two hard jets
via weak interactions at the LHC. The calculation includes all weak-boson
fusion and quark-antiquark annihilation diagrams as well as the corresponding
interferences. The electroweak corrections, which are discussed here for the
first time, reduce the cross sections by 5%, and thus are of the same order of
magnitude as the QCD corrections. As argued in previous papers, where s-channel
diagrams and interferences were neglected, the QCD corrections connected to
interference effects are small.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:49:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ciccolini",
"M.",
""
],
[
"Denner",
"A.",
""
],
[
"Dittmaier",
"S.",
""
]
] |
0707.0382 | Scott Gregory | S. G. Gregory, K. Wood, M. Jardine | Why are accreting T Tauri stars less luminous in X-rays than
non-accretors? | 8 pages, 2 figures, to appear in the proceedings of IAU S243:
Star-disk Interaction in Young Stars, Grenoble 2007, eds. J. Bouvier and I.
Appenzeller | null | 10.1017/S1743921307009520 | null | astro-ph | null | Accreting T Tauri stars are observed to be less luminous in X-rays than
non-accretors, an effect that has been detected in various star forming
regions. To explain this we have combined, for the first time, a radiative
transfer code with an accretion model that considers magnetic fields
extrapolated from surface magnetograms obtained from Zeeman-Doppler imaging.
Such fields consist of compact magnetic regions close to the stellar surface,
with extended field lines interacting with the disk. We study the propagation
of coronal X-rays through the magnetosphere and demonstrate that they are
strongly absorbed by the dense gas in accretion columns.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:30:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gregory",
"S. G.",
""
],
[
"Wood",
"K.",
""
],
[
"Jardine",
"M.",
""
]
] |
0707.0383 | J. J. Garcia-Ripoll | Maria Eckholt, Juan Jose Garcia-Ripoll | Pair condensation of bosonic atoms induced by optical lattices | Improved readability | Phys. Rev. A 77, 063603 (2008) | 10.1103/PhysRevA.77.063603 | NSF-KITP-07-155 | cond-mat.other quant-ph | null | We design a model of correlated hopping for bosonic atoms in optical
lattices. Such model exhibits three kinds of phases, comprehending a Mott
insulator, a charge density wave and a pair quasi-condensate. The
implementation of the model relies on two-state atoms embedded in
state-dependent lattices and having spin-dependent interactions. Contrary to
other models of pairing, our design is not based on perturbative effects and
should be observable in current experiments.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:26:15 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Sep 2007 16:52:14 GMT"
}
] | 2008-06-07T00:00:00 | [
[
"Eckholt",
"Maria",
""
],
[
"Garcia-Ripoll",
"Juan Jose",
""
]
] |
0707.0384 | Katalin Ga\'al-Nagy | Katalin Gaal-Nagy and Dieter Strauch | Ab-initio calculation of phonon dispersion curves: accelerating q point
convergence | 7 pages, 6 figures, draft version, to be submitted soon | null | 10.1103/PhysRevB.77.024309 | null | cond-mat.mtrl-sci cond-mat.dis-nn cond-mat.mes-hall cond-mat.other cond-mat.soft cond-mat.stat-mech | null | We present a scheme for the improved description of the long-range
interatomic force constants in a more accurate way than the procedure which is
commonly used within plane-wave based density-functional perturbation-theory
calculations. Our scheme is based on the inclusion of a q point grid which is
denser in a restricted area around the center of the Brillouin Zone than in the
remaining parts, even though the method is not limited to an area around Gamma.
We have tested the validity of our procedure in the case of high-pressure
phases of bulk silicon considering the bct and sh structure.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:48:02 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Gaal-Nagy",
"Katalin",
""
],
[
"Strauch",
"Dieter",
""
]
] |
0707.0385 | Fabrizio Lillo | Fabrizio Lillo, Esteban Moro, Gabriella Vaglica, Rosario N. Mantegna | Specialization of strategies and herding behavior of trading firms in a
financial market | 8 pages, 5 figures | null | 10.1088/1367-2630/10/4/043019 | null | q-fin.ST physics.soc-ph | null | The understanding of complex social or economic systems is an important
scientific challenge. Here we present a comprehensive study of the Spanish
Stock Exchange showing that most financial firms trading in that market are
characterized by a resulting strategy and can be classified in groups of firms
with different specialization. Few large firms overally act as trending firms
whereas many heterogeneous firm act as reversing firms. The herding properties
of these two groups are markedly different and consistently observed over a
four-year period of trading.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:30:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lillo",
"Fabrizio",
""
],
[
"Moro",
"Esteban",
""
],
[
"Vaglica",
"Gabriella",
""
],
[
"Mantegna",
"Rosario N.",
""
]
] |
0707.0386 | Alexander Reshetnyak | P. Yu. Moshin, A. A. Reshetnyak | BRST approach to Lagrangian formulation for mixed-symmetry fermionic
higher-spin fields | 41 pages, no figures, corrected typos, updated introduction, sections
5, 7.1, 7.2 with examples, conclusion with all basic results unchanged,
corrected formulae (3.27), (7.138), (7.140), added dimensional reduction part
with formulae (5.34)-(5.48), (7.8)-(7.10), (7.131)-(7.136), (7.143)-(7.164),
added Refs. 52, 53, 54, examples for massive fields developed by 2 ways | JHEP 0710:040,2007 | 10.1088/1126-6708/2007/10/040 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a Lagrangian description of irreducible half-integer higher-spin
representations of the Poincare group with the corresponding Young tableaux
having two rows, on a basis of the BRST approach. Starting with a description
of fermionic higher-spin fields in a flat space of any dimension in terms of an
auxiliary Fock space, we realize a conversion of the initial operator
constraint system (constructed with respect to the relations extracting
irreducible Poincare-group representations) into a first-class constraint
system. For this purpose, we find auxiliary representations of the constraint
subsuperalgebra containing the subsystem of second-class constraints in terms
of Verma modules. We propose a universal procedure of constructing
gauge-invariant Lagrangians with reducible gauge symmetries describing the
dynamics of both massless and massive fermionic fields of any spin. No
off-shell constraints for the fields and gauge parameters are used from the
very beginning. It is shown that the space of BRST cohomologies with a
vanishing ghost number is determined only by the constraints corresponding to
an irreducible Poincare-group representation. To illustrate the general
construction, we obtain a Lagrangian description of fermionic fields with
generalized spin (3/2,1/2) and (3/2,3/2) on a flat background containing the
complete set of auxiliary fields and gauge symmetries.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:31:21 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jul 2007 20:58:51 GMT"
},
{
"version": "v3",
"created": "Wed, 29 Aug 2007 22:20:03 GMT"
},
{
"version": "v4",
"created": "Fri, 12 Oct 2007 22:58:32 GMT"
},
{
"version": "v5",
"created": "Mon, 28 Dec 2009 18:10:58 GMT"
},
{
"version": "v6",
"created": "Wed, 3 Apr 2019 12:45:22 GMT"
}
] | 2019-04-04T00:00:00 | [
[
"Moshin",
"P. Yu.",
""
],
[
"Reshetnyak",
"A. A.",
""
]
] |
0707.0387 | Eiji Konishi | Eiji Konishi | Planar Homological Mirror Symmetry | 15 pages, 3 figures. v2: minor corrections, references added, v3:
fonts changed, accepted for publication in Int. J. Mod. Phys. A | Int.J.Mod.Phys.A22:5351-5368,2007 | 10.1142/S0217751X07037202 | null | hep-th math.AG math.SG | null | In this article, we formulate a planar limited version of the B-side in
homological mirror symmetry that formularizes Chern-Simons-type topological
open string field theory using homotopy associative algebra ($A_{\infty}$
algebra). This formulation is based on the works by Dijkgraaf and Vafa. We show
that our formularization includes gravity/gauge theory correspondence which
originates in the AdS/CFT duality of Dijkgraaf-Vafa theory.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:40:20 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Oct 2007 20:38:43 GMT"
},
{
"version": "v3",
"created": "Mon, 5 Nov 2007 02:48:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Konishi",
"Eiji",
""
]
] |
0707.0388 | Ingo Runkel | Matthias R. Gaberdiel, Ingo Runkel | From boundary to bulk in logarithmic CFT | 35 pages, 2 figures; v2: minor corrections, version to appear in
J.Phys.A | J. Phys. A41 (2008) 075402 | 10.1088/1751-8113/41/7/075402 | null | hep-th math.QA | null | The analogue of the charge-conjugation modular invariant for rational
logarithmic conformal field theories is constructed. This is done by
reconstructing the bulk spectrum from a simple boundary condition (the analogue
of the Cardy `identity brane'). We apply the general method to the c_1,p
triplet models and reproduce the previously known bulk theory for p=2 at c=-2.
For general p we verify that the resulting partition functions are modular
invariant. We also construct the complete set of 2p boundary states, and
confirm that the identity brane from which we started indeed exists. As a
by-product we obtain a logarithmic version of the Verlinde formula for the
c_1,p triplet models.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:45:44 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 11:51:32 GMT"
}
] | 2008-05-01T00:00:00 | [
[
"Gaberdiel",
"Matthias R.",
""
],
[
"Runkel",
"Ingo",
""
]
] |
0707.0389 | Naohito Tomita | Mitsuru Sugimoto and Naohito Tomita | A remark on fractional integrals on modulation spaces | 8 pages | null | null | null | math.FA math.AP | null | In this paper, we give the necessary and sufficient conditions for the
boundedness of fractional integral operators on the modulation spaces.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:42:25 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Sugimoto",
"Mitsuru",
""
],
[
"Tomita",
"Naohito",
""
]
] |
0707.0390 | Luca Lusanna | Luca Lusanna (INFN Firenze) | The York Map and the Role of Non-Inertial Frames in the Geometrical View
of the Gravitational Field | Talk at the International School on {\it Astrophysical Relativity}
John Archibald Wheeler, Erice June 1-7, 2006. 14 pages | null | null | null | gr-qc astro-ph hep-th | null | The role of non-inertial frames in a class of models of general relativity is
clarified by means of Dirac's theory of constraints. The identification of a
York canonical basis allows to give the interpretation of the gauge variables
as generalized inertial effects and to identify the Dirac observables of the
gravitational field with generalized tidal effects. York time is the gauge
variable controlling the clock synchronization convention. Differently from
special relativity, the instantaneous 3-spaces are dynamically determined.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:45:14 GMT"
}
] | 2007-07-09T00:00:00 | [
[
"Lusanna",
"Luca",
"",
"INFN Firenze"
]
] |
0707.0391 | Naohito Tomita | Masaharu Kobayashi, Mitsuru Sugimoto and Naohito Tomita | On the $L^2$-boundedness of pseudo-differential operators and their
commutators with symbols in $\alpha$-modulation spaces | 16 pages | null | null | null | math.FA math.AP | null | In this paper, we consider the $L^2$-boundedness of pseudo-differential
operators with symbols in $\alpha$-modulation spaces.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 10:59:29 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Kobayashi",
"Masaharu",
""
],
[
"Sugimoto",
"Mitsuru",
""
],
[
"Tomita",
"Naohito",
""
]
] |
0707.0392 | Jochen Schieck R | J. Schieck, S. Bethke, O. Biebel, S. Kluth, P. A. Movilla Fernandez,
C. Pahl and the JADE Collaboration | Measurement of the Strong Coupling alpha_s from the Four-Jet Rate in
e+e- Annihilation using JADE data | 21 pages, 19 figures. arXiv admin note: substantial text overlap with
arXiv:hep-ex/0601048 | Eur.Phys.J.C48:3-13,2006; Eur.Phys.J.C50:769,2007 | 10.1140/epjc/s2006-02625-4 10.1140/epjc/s10052-007-0226-6 | MPP-2006-161 | hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Data from e+e- annihilation into hadrons collected by the JADE experiment at
centre-of-mass energies between 14 GeV and 44 GeV are used to study the
four-jet event production rate as a function of the Durham jet algorithm's
resolution parameter ycut. The four-jet rate is compared to QCD next-to-leading
order calculations including resummation of large logarithms in the
next-to-leading logarithmic approximation. The strong coupling measured from
the four-jet rate is
as(MZ)=0.1159+-0.0004(stat)+-0.0012(expt)+-0.0024(had)+-0.0007(theo) in
agreement with the world average.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 11:26:19 GMT"
},
{
"version": "v2",
"created": "Fri, 18 May 2012 13:05:34 GMT"
}
] | 2012-05-21T00:00:00 | [
[
"Schieck",
"J.",
""
],
[
"Bethke",
"S.",
""
],
[
"Biebel",
"O.",
""
],
[
"Kluth",
"S.",
""
],
[
"Fernandez",
"P. A. Movilla",
""
],
[
"Pahl",
"C.",
""
],
[
"Collaboration",
"the JADE",
""
]
] |
0707.0393 | Poznanski Dovi | Dovi Poznanski, Dan Maoz, Naoki Yasuda, Ryan J. Foley, Mamoru Doi,
Alexei V. Filippenko, Masataka Fukugita, Avishay Gal-Yam, Buell T. Jannuzi,
Tomoki Morokuma, Takeshi Oda, Heidi Schweiker, Keren Sharon, Jeffrey M.
Silverman, and Tomonori Totani | Supernovae in the Subaru Deep Field: An Initial Sample, and Type Ia
Rate, out to Redshift 1.6 | 20 pages, 8 figures, MNRAS accepted | null | 10.1111/j.1365-2966.2007.12424.x | NSF-KITP-07-162 | astro-ph | null | Large samples of high-redshift supernovae (SNe) are potentially powerful
probes of cosmic star formation, metal enrichment, and SN physics. We present
initial results from a new deep SN survey, based on re-imaging in the R, i', z'
bands, of the 0.25 deg2 Subaru Deep Field (SDF), with the 8.2-m Subaru
telescope and Suprime-Cam. In a single new epoch consisting of two nights of
observations, we have discovered 33 candidate SNe, down to a z'-band magnitude
of 26.3 (AB). We have measured the photometric redshifts of the SN host
galaxies, obtained Keck spectroscopic redshifts for 17 of the host galaxies,
and classified the SNe using the Bayesian photometric algorithm of Poznanski et
al. (2007) that relies on template matching. After correcting for biases in the
classification, 55% of our sample consists of Type Ia supernovae and 45% of
core-collapse SNe. The redshift distribution of the SNe Ia reaches z ~ 1.6,
with a median of z ~ 1.2. The core-collapse SNe reach z ~ 1.0, with a median of
z ~ 0.5. Our SN sample is comparable to the Hubble Space Telescope/GOODS sample
both in size and redshift range. The redshift distributions of the SNe in the
SDF and in GOODS are consistent, but there is a trend (which requires
confirmation using a larger sample) for more high-z SNe Ia in the SDF. This
trend is also apparent when comparing the SN Ia rates we derive to those based
on GOODS data. Our results suggest a fairly constant rate at high redshift that
could be tracking the star-formation rate. Additional epochs on this field,
already being obtained, will enlarge our SN sample to the hundreds, and
determine whether or not there is a decline in the SN Ia rate at z >~ 1.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 11:28:38 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Sep 2007 11:57:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Poznanski",
"Dovi",
""
],
[
"Maoz",
"Dan",
""
],
[
"Yasuda",
"Naoki",
""
],
[
"Foley",
"Ryan J.",
""
],
[
"Doi",
"Mamoru",
""
],
[
"Filippenko",
"Alexei V.",
""
],
[
"Fukugita",
"Masataka",
""
],
[
"Gal-Yam",
"Avishay",
""
],
[
"Jannuzi",
"Buell T.",
""
],
[
"Morokuma",
"Tomoki",
""
],
[
"Oda",
"Takeshi",
""
],
[
"Schweiker",
"Heidi",
""
],
[
"Sharon",
"Keren",
""
],
[
"Silverman",
"Jeffrey M.",
""
],
[
"Totani",
"Tomonori",
""
]
] |
0707.0394 | Davide Cora | Davide Cora, Ferdinando Di Cunto, Michele Caselle, Paolo Provero | Identification of candidate regulatory sequences in mammalian 3' UTRs by
statistical analysis of oligonucleotide distributions | Added two references | BMC Bioinformatics. 2007 May 24;8:174. PMID: 17524134 | null | null | q-bio.GN | null | 3' untranslated regions (3' UTRs) contain binding sites for many regulatory
elements, and in particular for microRNAs (miRNAs). The importance of
miRNA-mediated post-transcriptional regulation has become increasingly clear in
the last few years.
We propose two complementary approaches to the statistical analysis of
oligonucleotide frequencies in mammalian 3' UTRs aimed at the identification of
candidate binding sites for regulatory elements. The first method is based on
the identification of sets of genes characterized by evolutionarily conserved
overrepresentation of an oligonucleotide. The second method is based on the
identification of oligonucleotides showing statistically significant strand
asymmetry in their distribution in 3' UTRs.
Both methods are able to identify many previously known binding sites located
in 3'UTRs, and in particular seed regions of known miRNAs. Many new candidates
are proposed for experimental verification.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 11:39:13 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jul 2007 23:30:34 GMT"
}
] | 2007-07-17T00:00:00 | [
[
"Cora",
"Davide",
""
],
[
"Di Cunto",
"Ferdinando",
""
],
[
"Caselle",
"Michele",
""
],
[
"Provero",
"Paolo",
""
]
] |
0707.0395 | H\'el\`ene Roussel | H. Roussel (1), G. Helou (2), D.J. Hollenbach (3), B.T. Draine (4),
J.D. Smith (5), L. Armus (2), E. Schinnerer (1), F. Walter (1), C.W.
Engelbracht (5), M.D. Thornley (6), R.C. Kennicutt (7 and 5), D. Calzetti
(8), D.A. Dale (9), E.J. Murphy (10), C. Bot (2) ((1) MPIA, Germany, (2)
Caltech, CA, (3) NASA Ames, CA, (4) Princeton Uni., NJ, (5) Steward Obs., AZ,
(6) Bucknell Uni., PA, (7) IoA, UK, (8) Uni. of Massachusetts, MA, (9) Uni.
of Wyoming, WY, (10) Yale Uni., CT) | Warm molecular hydrogen in the Spitzer SINGS galaxy sample | ApJS, in press | Astrophys.J.669:959-981,2007 | 10.1086/521667 | null | astro-ph | null | (simplified) Results on the properties of warm H2 in 57 normal galaxies are
derived from H2 rotational transitions, obtained as part of SINGS. This study
extends previous extragalactic surveys of H2, the most abundant constituent of
the molecular ISM, to more common systems (L_FIR = e7 to 6e10 L_sun) of all
morphological and nuclear types. The S(1) transition is securely detected in
the nuclear regions of 86% of SINGS galaxies with stellar masses above 10^9.5
M_sun. The derived column densities of warm H2 (T > ~100 K), even though
averaged over kiloparsec-scale areas, are commensurate with those of resolved
PDRs; the median of the sample is 3e20 cm-2. They amount to between 1% and >30%
of the total H2. The power emitted in the sum of the S(0) to S(2) transitions
is on average 30% of the [SiII] line power, and ~4e-4 of the total infrared
power (TIR) within the same area for star-forming galaxies, which is consistent
with excitation in PDRs. The fact that H2 emission scales tightly with PAH
emission, even though the average radiation field intensity varies by a factor
ten, can also be understood if both tracers originate predominantly in PDRs,
either dense or diffuse. A large fraction of the 25 LINER/Sy targets, however,
strongly depart from the rest of the sample, in having warmer H2 in the excited
states, and an excess of H2 emission with respect to PAHs, TIR and [SiII]. We
propose a threshold in H2 to PAH power ratios, allowing the identification of
low-luminosity AGNs by an excess H2 excitation. A dominant contribution from
shock heating is favored in these objects. Finally, we detect, in nearly half
the star-forming targets, non-equilibrium ortho to para ratios, consistent with
FUV pumping combined with incomplete ortho-para thermalization by collisions,
or possibly non-equilibrium PDR fronts advancing into cold gas.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 11:56:25 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Roussel",
"H.",
"",
"7 and 5"
],
[
"Helou",
"G.",
"",
"7 and 5"
],
[
"Hollenbach",
"D. J.",
"",
"7 and 5"
],
[
"Draine",
"B. T.",
"",
"7 and 5"
],
[
"Smith",
"J. D.",
"",
"7 and 5"
],
[
"Armus",
"L.",
"",
"7 and 5"
],
[
"Schinnerer",
"E.",
"",
"7 and 5"
],
[
"Walter",
"F.",
"",
"7 and 5"
],
[
"Engelbracht",
"C. W.",
"",
"7 and 5"
],
[
"Thornley",
"M. D.",
"",
"7 and 5"
],
[
"Kennicutt",
"R. C.",
"",
"7 and 5"
],
[
"Calzetti",
"D.",
""
],
[
"Dale",
"D. A.",
""
],
[
"Murphy",
"E. J.",
""
],
[
"Bot",
"C.",
""
]
] |
0707.0396 | Hidenori Fukaya | Sinya Aoki, Hidenori Fukaya, Shoji Hashimoto and Tetsuya Onogi | Finite volume QCD at fixed topological charge | 22pages, references added | Phys.Rev.D76:054508,2007 | 10.1103/PhysRevD.76.054508 | UTHEP-547, RIKEN-TH-105, KEK-CP-195, YITP-07-41 | hep-lat hep-th | null | In finite volume the partition function of QCD with a given $\theta$ is a sum
of different topological sectors with a weight primarily determined by the
topological susceptibility. If a physical observable is evaluated only in a
fixed topological sector, the result deviates from the true expectation value
by an amount proportional to the inverse space-time volume 1/V. Using the
saddle point expansion, we derive formulas to express the correction due to the
fixed topological charge in terms of a 1/V expansion. Applying this formula, we
propose a class of methods to determine the topological susceptibility in QCD
from various correlation functions calculated in a fixed topological sector.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 11:47:59 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Jul 2007 02:43:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aoki",
"Sinya",
""
],
[
"Fukaya",
"Hidenori",
""
],
[
"Hashimoto",
"Shoji",
""
],
[
"Onogi",
"Tetsuya",
""
]
] |
0707.0397 | Shijun Xiang jack-xiang | Shijun Xiang and Jiwu Huang | Robust Audio Watermarking Against the D/A and A/D conversions | Pages 29 | null | null | null | cs.CR cs.MM | null | Audio watermarking has played an important role in multimedia security. In
many applications using audio watermarking, D/A and A/D conversions (denoted by
DA/AD in this paper) are often involved. In previous works, however, the
robustness issue of audio watermarking against the DA/AD conversions has not
drawn sufficient attention yet. In our extensive investigation, it has been
found that the degradation of a watermarked audio signal caused by the DA/AD
conversions manifests itself mainly in terms of wave magnitude distortion and
linear temporal scaling, making the watermark extraction failed. Accordingly, a
DWT-based audio watermarking algorithm robust against the DA/AD conversions is
proposed in this paper. To resist the magnitude distortion, the relative energy
relationships among different groups of the DWT coefficients in the
low-frequency sub-band are utilized in watermark embedding by adaptively
controlling the embedding strength. Furthermore, the resynchronization is
designed to cope with the linear temporal scaling. The time-frequency
localization characteristics of DWT are exploited to save the computational
load in the resynchronization. Consequently, the proposed audio watermarking
algorithm is robust against the DA/AD conversions, other common audio
processing manipulations, and the attacks in StirMark Benchmark for Audio,
which has been verified by experiments.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 11:49:03 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Xiang",
"Shijun",
""
],
[
"Huang",
"Jiwu",
""
]
] |
0707.0398 | Leonardo Castelano | L.K. Castelano, G.-Q. Hai and M.-T. Lee | Exchange effects on electron scattering through a quantum dot embedded
in a two-dimensional semiconductor structure | 11 pages, 4 figures | Phys. Rev. B, 76, 165306 (2007) | 10.1103/PhysRevB.76.165306 | null | cond-mat.other | null | We have developed a theoretical method to study scattering processes of an
incident electron through an N-electron quantum dot (QD) embedded in a
two-dimensional (2D) semiconductor. The generalized Lippmann-Schwinger
equations including the electron-electron exchange interaction in this system
are solved for the continuum electron by using the method of continued
fractions (MCF) combined with 2D partial-wave expansion technique. The method
is applied to a one-electron QD case. Cross-sections are obtained for both the
singlet and triplet couplings between the incident electron and the QD electron
during the scattering. The total elastic cross-sections as well as the
spin-flip scattering cross-sections resulting from the exchange potential are
presented. Furthermore, inelastic scattering processes are also studied using a
multichannel formalism of the MCF.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 11:55:48 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Nov 2007 18:41:08 GMT"
}
] | 2007-11-19T00:00:00 | [
[
"Castelano",
"L. K.",
""
],
[
"Hai",
"G. -Q.",
""
],
[
"Lee",
"M. -T.",
""
]
] |
0707.0399 | Wen Ling Wang | W.L. Wang, F. Huang, Z.Y. Zhang, Y.W. Yu, F.Liu | Low-lying ud anti-s anti-s configurations in a non-relativistic
constituent quark model | 17 pages, 1 figure | J.Phys.G34:1771-1782,2007 | 10.1088/0954-3899/34/7/015 | null | nucl-th | null | The energies of the low-lying isoscalar and isovector ud anti-s anti-s
configurations with spin-parity J^P=0^+, 1^+, and 2^+ are calculated in a
non-relativistic constituent quark model by use of the variational method. The
contributions of various parts of the quark-quark interacting potentials
including the s-channel interaction are investigated, and the effect of
different forms of confinement potential is examined. The model parameters are
determined by the same method as in our previous work, and they still can
satisfactorily describe the nucleon-nucleon scattering phase shifts and the
hyperon-nucleon cross sections. The parameters of the s-channel interaction are
fixed by the masses of K and K^* mesons, for which the size parameter is taken
to be two possible values. When it is chosen as the same as baryons', the
numerical results show that the masses of all the ud anti-s anti-s
configurations are higher than the corresponding meson-meson thresholds. But
when the size parameter for the K and K^* mesons is adjusted to be smaller than
that for the baryons, the ud anti-s anti-s configuration with I=0 and J^P=1^+
is found to lie lower than the K^*K^* threshold, furthermore, this state has a
very small KK^* component and the interaction matrix elements between this
state and KK^* is comparatively small, thus its coupling to the KK^* channel
will consequently be weak and it might be regarded as a possible tetraquark
candidate.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 12:08:03 GMT"
}
] | 2007-07-16T00:00:00 | [
[
"Wang",
"W. L.",
""
],
[
"Huang",
"F.",
""
],
[
"Zhang",
"Z. Y.",
""
],
[
"Yu",
"Y. W.",
""
],
[
"Liu",
"F.",
""
]
] |
0707.0400 | Luis Paris | Luis Paris, Loic Rabenda | Singular Hecke algebras, Markov traces, and HOMFLY-type invariants | null | null | null | null | math.GT math.RT | null | We define the singular Hecke algebra ${\mathcal H} (SB_n)$ as the quotient of
the singular braid monoid algebra ${\mathbb C} (q) [SB_n]$ by the Hecke
relations $\sigma_k^2 = (q-1) \sigma_k +q$, $1 \le k\le n-1$, and define the
Markov traces on the sequence $\{{\mathcal H}(SB_n)\}_{n=1}^{+\infty}$ in the
same way as for the Markov traces on the tower of (non-singular) Hecke algebras
of the symmetric groups. We prove that the Markov traces are in one-to-one
correspondance with the invariants that satisfies some skein relation, and
compute an explicit classification of the Markov traces. Thanks to this
classification, we define some universal HOMFLY-type invariant which has the
property that it distinguishes all the pairs of singular links that can be
distinguished by an invariant which satisfies the required skein relation.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 12:20:38 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Paris",
"Luis",
""
],
[
"Rabenda",
"Loic",
""
]
] |
0707.0401 | Travis Norsen | Travis Norsen | J.S. Bell's Concept of Local Causality | 19 pages, 4 figures | American Journal of Physics, 79, 1261 (2011) | 10.1119/1.3630940 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | John Stewart Bell's famous 1964 theorem is widely regarded as one of the most
important developments in the foundations of physics. It has even been
described as "the most profound discovery of science." Yet even as we approach
the 50th anniversary of Bell's discovery, its meaning and implications remain
controversial. Many textbooks and commentators report that Bell's theorem
refutes the possibility (suggested especially by Einstein, Podolsky, and Rosen
in 1935) of supplementing ordinary quantum theory with additional ("hidden")
variables that might restore determinism and/or some notion of an
observer-independent reality. On this view, Bell's theorem supports the
orthodox Copenhagen interpretation. Bell's own view of his theorem, however,
was quite different. He instead took the theorem as establishing an "essential
conflict" between the now well-tested empirical predictions of quantum theory
and relativistic \emph{local causality}. The goal of the present paper is, in
general, to make Bell's own views more widely known and, in particular, to
explain in detail Bell's little-known mathematical formulation of the concept
of relativistic local causality on which his theorem rests. We thus collect and
organize many of Bell's crucial statements on these topics, which are scattered
throughout his writings, into a self-contained, pedagogical discussion
including elaborations of the concepts "beable", "completeness", and
"causality" which figure in the formulation. We also show how local causality
(as formulated by Bell) can be used to derive an empirically testable Bell-type
inequality, and how it can be used to recapitulate the EPR argument.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 12:21:19 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jan 2010 21:19:29 GMT"
},
{
"version": "v3",
"created": "Thu, 10 Mar 2011 20:07:08 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Norsen",
"Travis",
""
]
] |
0707.0402 | Andreas Winter | Andreas Winter | The maximum output p-norm of quantum channels is not multiplicative for
any p>2 | Superseded by arXiv:0807.4753! -- Old comment: Four pages only. If
you write to me, please don't tell me how simple and obvious it is - I know
that myself. I accept suggestions for journals to submit to, though; the
obscurer the better. V2 has some corrections, and I removed one reference.
Don't miss the more recent work arXiv:0707.3291 | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the claim made in the title by showing that approximately
randomising maps of large dimension are counterexamples to the multiplicativity
conjecture.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 12:21:33 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Aug 2007 11:47:25 GMT"
},
{
"version": "v3",
"created": "Wed, 30 Jul 2008 07:21:14 GMT"
}
] | 2008-07-30T00:00:00 | [
[
"Winter",
"Andreas",
""
]
] |
0707.0403 | Oliver Morsch | H. Lignier and C. Sias and D. Ciampini and Y. Singh and A. Zenesini
and O. Morsch and E. Arimondo | Dynamical control of matter-wave tunneling in periodic potentials | 5 pages, 3 figures | null | 10.1103/PhysRevLett.99.220403 | null | cond-mat.other quant-ph | null | We report on measurements of dynamical suppression of inter-well tunneling of
a Bose-Einstein condensate (BEC) in a strongly driven optical lattice. The
strong driving is a sinusoidal shaking of the lattice corresponding to a
time-varying linear potential, and the tunneling is measured by letting the BEC
freely expand in the lattice. The measured tunneling rate is reduced and, for
certain values of the shaking parameter, completely suppressed. Our results are
in excellent agreement with theoretical predictions. Furthermore, we have
verified that in general the strong shaking does not destroy the phase
coherence of the BEC, opening up the possibility of realizing quantum phase
transitions by using the shaking strength as the control parameter.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 12:40:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lignier",
"H.",
""
],
[
"Sias",
"C.",
""
],
[
"Ciampini",
"D.",
""
],
[
"Singh",
"Y.",
""
],
[
"Zenesini",
"A.",
""
],
[
"Morsch",
"O.",
""
],
[
"Arimondo",
"E.",
""
]
] |
0707.0404 | Collaboration Secretariat Opal | The OPAL collaboration, et al | Search for Direc Magnetic Monopoles in e+e- Collisions with the OPAL
Detector at LEP2 | 13 pages, 3 figures, Submitted to Phys. Letts. B | Phys.Lett.B663:37-42,2008 | 10.1016/j.physletb.2008.03.057 | CERN-PH-EP/2007-019 | hep-ex | null | This letter describes a direct search for pair produced magnetic monopoles in
e+e- collisions. The analysis is based on 62.7 pb^-1 of data collected with the
OPAL detector at an average centre-of-mass energy of sqrt(s)= 206.3GeV. The
monopole signal was assumed to be characterized by two back-to-back particles
with an anomalously high ionization energy loss de/dx in the tracking chambers.
No evidence for production of monopoles was observed. Upper limits were
obtained on the magnetic monopole pair-production cross-section (sigma) in the
mass range 45 GeV/c^2<m_M<102 GeV/c^2. The average limit is sigma < 0.05 pb and
is essentially independent of the magnetic monopole mass. The cross-section
limit is derived at the 95% confidence level and is valid for spin-1/2 magnetic
monopoles.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 12:36:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"The OPAL collaboration",
"",
""
]
] |
0707.0405 | Orlando Panella | O. Panella | Casimir-Polder intermolecular forces in minimal length theories | 1 Figure. Version published by Physical Review D. Few references
added, typos corrected | Phys.Rev.D76:045012,2007 | 10.1103/PhysRevD.76.045012 | null | hep-th hep-ph | null | Generalized uncertainty relations are known to provide a minimal length
$\hbar\sqrt{\beta}$. The effect of such minimal length in the Casimir-Polder
interactions between neutral atoms (molecules) is studied. The first order
correction term in the minimal uncertainty parameter is derived and found to
describe an attractive potential scaling as $r^{-9}$ as opposed to the well
known $r^{-7}$ long range retarded potential.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 12:40:01 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Sep 2007 14:51:03 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Panella",
"O.",
""
]
] |
0707.0406 | Evghenii Gaburov | E. Gaburov, A. Gualandris, S. Portegies Zwart | On the onset of runaway stellar collisions in dense star clusters I.
Dynamics of the first collision | 11 pages, 10 figures, accepted to MNRAS | null | 10.1111/j.1365-2966.2007.12731.x | null | astro-ph | null | We study the circumstances under which first collisions occur in young and
dense star clusters. The initial conditions for our direct $N$-body simulations
are chosen such that the clusters experience core collapse within a few million
years, before the most massive stars have left the main-sequence. It turns out
that the first collision is typically driven by the most massive stars in the
cluster. Upon arrival in the cluster core, by dynamical friction, massive stars
tend to form binaries. The enhanced cross section of the binary compared to a
single star causes other stars to engage the binary. A collision between one of
the binary components and the incoming third star is then mediated by the
encounters between the binary and other cluster members. Due to the geometry of
the binary-single star engagement the relative velocity at the moment of impact
is substantially different than in a two-body encounter. This may have profound
consequences for the further evolution of the collision product.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 12:40:49 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Dec 2007 14:38:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gaburov",
"E.",
""
],
[
"Gualandris",
"A.",
""
],
[
"Zwart",
"S. Portegies",
""
]
] |
0707.0407 | Pascale Jablonka | J. Gorgas, P. Jablonka, P. Goudfrooij | Stellar Population Gradients in Bulges along the Hubble Sequence: I. The
Data | Accepted for publication in A&A | null | 10.1051/0004-6361:20066690 | null | astro-ph | null | This is the first paper presenting our long-term project aimed at studying
the nature of bulges through the analysis of their stellar population
gradients. We present deep spectroscopic observations along the minor axis and
the data reduction for a sample of 32 bulges of edge-on spiral galaxies. We
explain in detail our procedures to measure their dynamical parameters
(rotation curves and velocity dispersion profiles) and line-strength indices,
including the conversion to the Lick/IDS system. Tables giving the values of
the dynamical parameters and line-strength indices at each galactocentric
radius are presented (in electronic form) for each galaxy of the sample. The
derived line-strength gradients from this dataset will be analyzed in a
forthcoming paper to set constraints on the different scenarios for the
formation of the bulges.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 12:51:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gorgas",
"J.",
""
],
[
"Jablonka",
"P.",
""
],
[
"Goudfrooij",
"P.",
""
]
] |
0707.0408 | Lei Qian | Lei Qian, B.F. Liu, Xue-Bing Wu | Disk-Evaporation Fed Corona: Structure and Evaporation Feature with
Magnetic Field | Accepted by ApJ | null | 10.1086/521388 | null | astro-ph | null | The disk-corona evaporation model naturally interprets many observational
phenomena in black hole X-ray binaries, such as the truncation of an accretion
disk and the spectral state transitions. On the other hand, magnetic field is
known to play an important role in transporting angular momentum and producing
viscosity in accretion flows. In this work, we explicitly take the magnetic
field in the accretion disk corona into account and numerically calculate the
coronal structure on the basis of our two-temperature evaporation code. We show
that the magnetic field influences the coronal structure by its contribution to
the pressure, energy and radiative cooling in the corona and by decreasing the
vertical heat conduction. We found that the maximal evaporation rate keeps more
or less constant ($\sim 0.03$ Eddington rate) while the strength of magnetic
fields changes, but that the radius corresponding to the maximal evaporation
rate decreases with increasing magnetic field. This predicts that the spectral
state transition always occurs at a few percent of Eddington accretion rate,
while the inner edge of thin disk can be at $\sim 100 R_{\rm S} $ or even less
in the hard state before the transition to the soft state. These results
alleviate the problem that previous evaporation models predict too large a
truncation radius, and are in better agreement with the observational results
of several black hole X-ray binaries, though discrepancies remain.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 12:42:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Qian",
"Lei",
""
],
[
"Liu",
"B. F.",
""
],
[
"Wu",
"Xue-Bing",
""
]
] |
0707.0409 | Pavel Krtous | David Kubiznak, Pavel Krtous | On conformal Killing-Yano tensors for Plebanski-Demianski family of
solutions | 7 pages, no figures | Phys.Rev.D76:084036,2007 | 10.1103/PhysRevD.76.084036 | Alberta-Thy-15-07 | gr-qc hep-th | null | We present the explicit expressions for the conformal Killing-Yano tensors
for the Plebanski-Demianski family of type D solutions in four dimensions. Some
physically important special cases are discussed in more detail. In particular,
it is demonstrated how the conformal Killing-Yano tensor becomes the
Killing-Yano tensor for the solutions without acceleration. A possible
generalization into higher dimensions is studied. Whereas the transition from
the nonaccelerating to accelerating solutions in four dimensions is achieved by
the conformal rescaling of the metric, we show that such a procedure is not
sufficiently general in higher dimensions - only the maximally symmetric
spacetimes in 'accelerated' coordinates are obtained.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 12:47:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kubiznak",
"David",
""
],
[
"Krtous",
"Pavel",
""
]
] |
0707.0410 | Pawel Ciecielag | P. Ciecielag, S. Ida, A. Gawryszczak, A. Burkert | On gas drag in a circular binary system | 10 pages, 9 figures | Astron.Astrophys.470:367,2007 | 10.1051/0004-6361:20077284 | null | astro-ph | null | We investigate both analytically and numerically the motion of massless
particles orbiting primary star in a close circular binary system with
particular focus on the gas drag effects. These are the first calculations with
particles ranging in size from 1m to 10km, which account for the presence of a
tidally perturbed gaseous disk. We have found numerically that the radial mass
transport by the tidal waves plays a crucial role in the orbital evolution of
particles. Numerical results are confirmed analytical calculations that do not
assume anything about origin of the radial flow in the disk. We demonstrate
that the migration rate of a particle in a disk out of radial equilibrium is
enhanced due to the enhanced mass flux of gas colliding with the particle and
the migration is always directed inward regardless of the sign of the radial
gas velocity. Within the framework of the perturbation theory we derive
general, formulae for short-term variations of the particle semi-major axis,
eccentricity and inclination in such disk. The formulae account for departures
from axial symmetry by introducing effective components of the gas velocity.
They agree with numerical results within several percent. We have also found in
numerical simulations that the tidal waves introduce coherence in periastron
longitude and eccentricity for particles on neighbouring orbits. The degree of
the coherence depends on the particle size and on the distance from the primary
star, being most prominent for particles with 10m radius. The results are
important mainly in the context of planetesimal formation and, to a lesser
degree, during the early planetesimal accretion stage.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 12:54:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ciecielag",
"P.",
""
],
[
"Ida",
"S.",
""
],
[
"Gawryszczak",
"A.",
""
],
[
"Burkert",
"A.",
""
]
] |
0707.0411 | Gilles Montambaux | Gilles Montambaux | Interference pattern of a long diffusive Josephson junction | 4 pages, 2 figures | null | null | null | cond-mat.mes-hall | null | We calculate the modulation by a magnetic field of the critical current of a
long disordered Josephson junction in the diffusive limit, i.e. when the
dimensions of the junction are larger that the elastic mean free path, and when
the length $L$ is much larger than the width $w$. Due to the averaging of the
gauge invariant phase factor over diffusive trajectories, the well-known
oscillations of the Fraunhofer pattern are smoothed out and replaced by an
exponential decay at large field. The predicted pattern is universal, i.e., it
is independent of the disorder strength. We point out an interesting relation
with the physics of speckle correlations in optics of turbid media.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 16:01:30 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Montambaux",
"Gilles",
""
]
] |
0707.0412 | Jayanta Sarma Kumar | R. Baishya and J. K. Sarma | Solution of non-singlet DGLAP evolution equation in leading order and
next-to-leading order at small-x by method of characteristics | 11 pages including 5 figures | null | null | null | hep-ph | null | The non-singlet structure functions have been obtained by solving
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations in
leading order (LO) and next-to-leading order (NLO) at the small-x limit. Here a
Taylor series expansion has been used and then the method of characteristics
has been applied to solve the evolution equations. Results are comopared with
the Fermilab experiment E665 data and New Muon Collaboration (NMC) data.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 13:02:23 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Baishya",
"R.",
""
],
[
"Sarma",
"J. K.",
""
]
] |
0707.0413 | Andre Th\"uring | Andre Thuering, Roman Schnabel, Harald Lueck, and Karsten Danzmann | Detuned Twin-Signal-Recycling for ultra-high precision interferometers | null | Opt. Lett. 32, 985-987 (2007) | 10.1364/OL.32.000985 | null | quant-ph | null | We propose a new interferometer technique for high precision phase
measurements such as those in gravitational wave detection. The technique
utilizes a pair of optically coupled resonators that provides identical
resonance conditions for the upper as well the lower phase modulation signal
sidebands. This symmetry significantly reduces the noise spectral density in a
wide frequency band compared with single sideband recycling topologies of
current and planned gravitational wave detectors. Furthermore the application
of squeezed states of light becomes less demanding.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 13:03:18 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Thuering",
"Andre",
""
],
[
"Schnabel",
"Roman",
""
],
[
"Lueck",
"Harald",
""
],
[
"Danzmann",
"Karsten",
""
]
] |
0707.0414 | Anders Olofsson | Anders Olofsson | A computation of Poisson kernels for some standard weighted biharmonic
operators in the unit disc | null | null | null | null | math.AP math.CA | null | We compute Poisson kernels for integer weight parameter standard weighted
biharmonic operators in the unit disc with Dirichlet boundary conditions. The
computations performed extend the supply of explicit examples of such kernels
and suggest similar formulas for these Poisson kernels to hold true in more
generality. Computations have been carried out using the open source computer
algebra package Maxima.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 13:37:51 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Olofsson",
"Anders",
""
]
] |
0707.0415 | Oskar Painter J | M. Borselli, T. J. Johnson, C. P. Michael, M. D. Henry, and Oskar
Painter | Surface Encapsulation for Low-Loss Silicon Photonics | 4 pages, 3 figures | null | 10.1063/1.2793820 | null | physics.optics | null | Encapsulation layers are explored for passivating the surfaces of silicon to
reduce optical absorption in the 1500-nm wavelength band. Surface-sensitive
test structures consisting of microdisk resonators are fabricated for this
purpose. Based on previous work in silicon photovoltaics, coatings of SiNx and
SiO2 are applied under varying deposition and annealing conditions. A short dry
thermal oxidation followed by a long high-temperature N2 anneal is found to be
most effective at long-term encapsulation and reduction of interface
absorption. Minimization of the optical loss is attributed to simultaneous
reduction in sub-bandgap silicon surface states and hydrogen in the capping
material.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 13:39:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Borselli",
"M.",
""
],
[
"Johnson",
"T. J.",
""
],
[
"Michael",
"C. P.",
""
],
[
"Henry",
"M. D.",
""
],
[
"Painter",
"Oskar",
""
]
] |
0707.0416 | Kostya Trachenko | K. Trachenko, C. M. Roland and R. Casalini | Relationship between non-exponentiality of relaxation and relaxation
time at the glass transition | null | See J. Phys. Chem. B 112, 5111 (2008) | null | null | cond-mat.dis-nn cond-mat.soft | null | By analyzing the experimental data for various glass-forming liquids and
polymers, we find that non-exponentiality $\beta$ and the relaxation time
$\tau$ are uniquely related: $\log(\tau)$ is an approximately linear function
of $1/\beta$, followed by a crossover to a higher linear slope. We rationalize
the observed relationship using a recently developed approach, in which the
problem of the glass transition is discussed as the elasticity problem.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 13:39:27 GMT"
}
] | 2008-07-15T00:00:00 | [
[
"Trachenko",
"K.",
""
],
[
"Roland",
"C. M.",
""
],
[
"Casalini",
"R.",
""
]
] |
0707.0417 | Andrew Collier Cameron | A. Collier Cameron, D. M. Wilson, R. G. West, L. Hebb, X.-B. Wang, S.
Aigrain, F. Bouchy, D. J. Christian, W. I. Clarkson, B. Enoch, M. Esposito,
E. Guenther, C.A. Haswell, G. Hebrard, C. Hellier, K. Horne, J. Irwin, S. R.
Kane, B. Loeillet, T. A. Lister, P. Maxted, M. Mayor, C. Moutou, N. Parley,
D. Pollacco, F. Pont, D. Queloz, R. Ryans, I. Skillen, R. A. Street, S. Udry
and P. J. Wheatley | Efficient identification of exoplanetary transit candidates from
SuperWASP light curves | 17 pages, 11 Figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12195.x | null | astro-ph | null | Transiting extrasolar planets constitute only a small fraction of the range
of stellar systems found to display periodic, shallow dimmings in wide-field
surveys employing small-aperture camera arrays. Here we present an efficient
selection strategy for follow-up observations, derived from analysis of the
light curves of a sample of 67 SuperWASP targets that passed the selection
tests we used in earlier papers, but which have subsequently been identified
either as planet hosts or as astrophysical false positives. We determine the
system parameters using Markov-chain Monte Carlo analysis of the SuperWASP
light curves. We use a constrained optimisation of chi-squared combined with a
Bayesian prior based on the main-sequence mass and radius expected from the
2MASS J-H colour. The Bayesian nature of the analysis allows us to quantify
both the departure of the host star from the main-sequence mass-radius relation
and the probability that the companion radius is less than 1.5 Jupiter radii.
When augmented by direct light curve analyses that detect binaries with unequal
primary and secondary eclipses, and objects with aperture blends that are
resolved by SuperWASP, we find that only 13 of the original 67 stars, including
the three known planets in the sample, would qualify for follow-up. This
suggests that planet discovery "hit rates" better than one-in-five should be
achievable. In addition, the stellar binaries that qualify are likely to have
astrophysically interesting stellar or sub-stellar secondaries.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 13:52:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cameron",
"A. Collier",
""
],
[
"Wilson",
"D. M.",
""
],
[
"West",
"R. G.",
""
],
[
"Hebb",
"L.",
""
],
[
"Wang",
"X. -B.",
""
],
[
"Aigrain",
"S.",
""
],
[
"Bouchy",
"F.",
""
],
[
"Christian",
"D. J.",
""
],
[
"Clarkson",
"W. I.",
""
],
[
"Enoch",
"B.",
""
],
[
"Esposito",
"M.",
""
],
[
"Guenther",
"E.",
""
],
[
"Haswell",
"C. A.",
""
],
[
"Hebrard",
"G.",
""
],
[
"Hellier",
"C.",
""
],
[
"Horne",
"K.",
""
],
[
"Irwin",
"J.",
""
],
[
"Kane",
"S. R.",
""
],
[
"Loeillet",
"B.",
""
],
[
"Lister",
"T. A.",
""
],
[
"Maxted",
"P.",
""
],
[
"Mayor",
"M.",
""
],
[
"Moutou",
"C.",
""
],
[
"Parley",
"N.",
""
],
[
"Pollacco",
"D.",
""
],
[
"Pont",
"F.",
""
],
[
"Queloz",
"D.",
""
],
[
"Ryans",
"R.",
""
],
[
"Skillen",
"I.",
""
],
[
"Street",
"R. A.",
""
],
[
"Udry",
"S.",
""
],
[
"Wheatley",
"P. J.",
""
]
] |
0707.0418 | Ulrika Magnea | Ulrika Magnea | Random matrices beyond the Cartan classification | 41 pages, no figures. References and comments added; the
representation of ensemble 15 changed to quaternion real. Version accepted
for publication on J. Phys. A | null | 10.1088/1751-8113/41/4/045203 | null | math-ph cond-mat.mes-hall hep-ph hep-th math.MP | null | It is known that hermitean random matrix ensembles can be identified with
symmetric coset spaces of Lie groups, or else with tangent spaces of the same.
This results in a classification of random matrix ensembles as well as
applications in practical calculations of physical observables. In this paper
we show that a large number of non-hermitean random matrix ensembles defined by
physically motivated symmetries - chiral symmetry, time reversal invariance,
space rotation invariance, particle-hole symmetry, or different reality
conditions - can likewise be identified with symmetric spaces. We give explicit
representations of the random matrix ensembles identified with lateral algebra
subspaces, and of the corresponding symmetric subalgebras spanning the group of
invariance. Among the ensembles listed we identify as special cases all the
hermitean ensembles identified with Cartan classes of symmetric spaces and the
three Ginibre ensembles with complex eigenvalues.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 13:40:24 GMT"
},
{
"version": "v2",
"created": "Tue, 27 Nov 2007 11:59:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Magnea",
"Ulrika",
""
]
] |
0707.0419 | Johan Bijnens | Johan Bijnens | Radiative and semileptonic decays in Chiral Perturbation Theory | 5 pages, presented at Kaon International Conference (KAON07), May
21-25, 2007, Laboratori Nazionali di Frascati dell'INFN, Frascati, Italy | PoSKAON:027,2008 | null | LU TP 07-21 | hep-ph | null | I give a short overview of what has been done in radiative and semileptonic
Kaon decays in Chiral Perturbation Theory. This includes for semileptonic
decays the work which has been done to order $p^6$ including preliminary
results of isospin breaking to that order in $K_{\ell3}$. For the radiative
decays I mainly present some results from recent work concerning
$K_{\ell3\gamma}$.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 13:52:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bijnens",
"Johan",
""
]
] |
0707.0420 | Mohammad Reza Setare | J. Sadeghi, M. R. Setare, B.Pourhassan | Entropy of Extremal Black Holes in Two Dimension | 6 pages, no figures | Acta Phys.Polon.B40:251-,2009 | null | null | hep-th | null | In this paper we apply the entropy function formalism to the two-dimensional
black hole which come from the compactification of the heterotic string theory
with the dilaton coupling function. We find the Bekenstein-Hawking entropy from
the value of the entropy function at its saddle point. Also we consider higher
derivative terms. After that we apply the entropy function formalism to the
Jackiw-Teitelboim (JT) model where we consider the effect of string-loop to
this model.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 14:08:44 GMT"
}
] | 2009-04-24T00:00:00 | [
[
"Sadeghi",
"J.",
""
],
[
"Setare",
"M. R.",
""
],
[
"Pourhassan",
"B.",
""
]
] |
0707.0421 | Riccardo Dondi | Paola Bonizzoni, Gianluca Della Vedova, Riccardo Dondi | The $k$-anonymity Problem is Hard | 21 pages, A short version of this paper has been accepted in FCT 2009
- 17th International Symposium on Fundamentals of Computation Theory | null | null | null | cs.DB cs.CC cs.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of publishing personal data without giving up privacy is becoming
increasingly important. An interesting formalization recently proposed is the
k-anonymity. This approach requires that the rows in a table are clustered in
sets of size at least k and that all the rows in a cluster become the same
tuple, after the suppression of some records. The natural optimization problem,
where the goal is to minimize the number of suppressed entries, is known to be
NP-hard when the values are over a ternary alphabet, k = 3 and the rows length
is unbounded. In this paper we give a lower bound on the approximation factor
that any polynomial-time algorithm can achive on two restrictions of the
problem,namely (i) when the records values are over a binary alphabet and k =
3, and (ii) when the records have length at most 8 and k = 4, showing that
these restrictions of the problem are APX-hard.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 14:17:49 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Jun 2009 16:40:37 GMT"
}
] | 2009-06-02T00:00:00 | [
[
"Bonizzoni",
"Paola",
""
],
[
"Della Vedova",
"Gianluca",
""
],
[
"Dondi",
"Riccardo",
""
]
] |
0707.0422 | Diego Mastrogiuseppe Lic | D. Mastrogiuseppe, C. Gazza and A. Dobry | Dimerization process and elementary excitations in spin-Peierls chains
coupled by frustrated interactions | 13 pages, 10 figures. Final published version with minor corrections
from the previous one | J. Phys.: Condens. Matter 20 (2008) 135223 | 10.1088/0953-8984/20/13/135223 | null | cond-mat.str-el | null | We consider the ground state and the elementary excitations of an array of
spin-Peierls chains coupled by elastic and magnetic interactions. It is
expected that the effect of the magnetic interchain coupling will be to reduce
the dimerization amplitude and that of the elastic coupling will be to confine
the spin one-half solitons corresponding to each isolated chain. We show that
this is the case when these interactions are not frustrated. On the other hand,
in the frustrated case we show that the amplitude of dimerization in the ground
state is independent of the strength of the interchain magnetic interaction in
a broad range of values of this parameter. We also show that free solitons
could be the elementary excitations when only nearest neighbor interactions are
considered. The case of an elastic interchain coupling is analyzed on a general
energetic consideration. To study the effect of the magnetic interchain
interaction the problem is simplified to a two-leg ladder which is solved using
DMRG calculations. We show that the deconfinement mechanism is effective even
with a significantly strong antiferromagnetic interchain coupling.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 14:22:09 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Dec 2007 19:56:23 GMT"
},
{
"version": "v3",
"created": "Thu, 13 Mar 2008 17:11:32 GMT"
}
] | 2008-03-13T00:00:00 | [
[
"Mastrogiuseppe",
"D.",
""
],
[
"Gazza",
"C.",
""
],
[
"Dobry",
"A.",
""
]
] |
0707.0423 | Andrej Arbuzov | A.B. Arbuzov, R.R. Sadykov | Inverse bremsstrahlung contributions to Drell-Yan like processes | 11 pages, 8 figures | J.Exp.Theor.Phys.106:488-494,2008 | 10.1134/S1063776108030096 | null | hep-ph | null | The contribution of the sub-process $\gamma q \to q' l_1\bar{l}_2$ in
hadron-hadron interactions is considered. It is a part of one-loop electroweak
radiative corrections for the Drell-Yan production of lepton pairs at hadron
colliders. It is shown that this contribution should be taken into account
aiming at the 1% accuracy of the Drell-Yan process theoretical description.
Both the neutral and charged current cases are evaluated. Numerical results are
presented for typical conditions of LHC experiments.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 14:23:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Arbuzov",
"A. B.",
""
],
[
"Sadykov",
"R. R.",
""
]
] |
0707.0424 | Linda I. Uruchurtu | Linda I. Uruchurtu | AdS/CFT for Four-Point Amplitudes involving Gravitino Exchange | 32 pages, 1 figure. Published Version. Minor changes | JHEP0709:086,2007 | 10.1088/1126-6708/2007/09/086 | DAMTP-2007-65 | hep-th | null | In this paper we compute the tree-level four-point scattering amplitude of
two dilatini and two axion-dilaton fields in type IIB supergravity in AdS5 x
S5. A special feature of this process is that there is an "exotic" channel in
which there are no singleparticle poles. Another novelty is that this process
involves the exchange of a bulk gravitino. The amplitude is interpreted in
terms of N = 4 supersymmetric Yang-Mills theory at large 't Hooft coupling.
Properties of the Operator Product Expansion are used to analyze the various
contributions from single- and double-trace operators in the weak and strongly
coupled regimes, and to determine the anomalous dimensions of semi-short
operators. The analysis is particularly clear in the exotic channel, given the
absence of BPS states.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 14:28:26 GMT"
},
{
"version": "v2",
"created": "Thu, 30 Aug 2007 12:38:39 GMT"
},
{
"version": "v3",
"created": "Fri, 14 Dec 2007 10:06:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Uruchurtu",
"Linda I.",
""
]
] |
0707.0425 | Peter Elbau | Peter Elbau | Random Normal Matrices and Polynomial Curves | 37 pages | null | null | null | math.QA math.PR | null | We show that in the large matrix limit, the eigenvalues of the normal matrix
model for matrices with spectrum inside a compact domain with a special class
of potentials homogeneously fill the interior of a polynomial curve uniquely
defined by the area of its interior domain and its exterior harmonic moments
which are all given as parameters of the potential.
Then we consider the orthogonal polynomials corresponding to this matrix
model and show that, under certain assumptions, the density of the zeros of the
highest relevant orthogonal polynomial in the large matrix limit is (up to some
constant factor) given by the discontinuity of the Schwarz function of this
polynomial curve.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 14:33:08 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Elbau",
"Peter",
""
]
] |
0707.0426 | Suzana Szilner | S. Szilner, C.A. Ur, L. Corradi, N. Marginean, G. Pollarolo, A.M.
Stefanini, S. Beghini, B.R. Behera, E. Fioretto, A. Gadea, B. Guiot, A.
Latina, P. Mason, G. Montagnoli, F. Scarlassara, M. Trotta, G. de Angelis, F.
Della Vedova, E. Farnea, F. Haas, S. Lenzi, S. Lunardi, R. Marginean, R
Menegazzo, D.R. Napoli, M. Nespolo, I.V. Pokrovsky, F. Recchia, M. Romoli,
M.-D. Salsac, N. Soic, J.J. Valiente-Dobon | Multinucleon transfer reactions in closed-shell nuclei | 10 pages, 9 figures | Phys.Rev.C76:024604,2007 | 10.1103/PhysRevC.76.024604 | null | nucl-ex | null | Multinucleon transfer reactions in 40Ca+96Zr and 90Zr+208Pb have been
measured at energies close to the Coulomb barrier in a high resolution
gamma-particle coincidence experiment. The large solid angle magnetic
spectrometer PRISMA coupled to the CLARA gamma-array has been employed.
Trajectory reconstruction has been applied for the complete identification of
transfer products. Mass and charge yields, total kinetic energy losses, gamma
transitions of the binary reaction partners, and comparison of data with
semiclassical calculations are reported. Specific transitions in 95Zr populated
in one particle transfer channels are discussed in terms of particle-phonon
couplings. The gamma decays from states in 42Ca in the excitation energy region
expected from pairing vibrations are also observed.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 14:37:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Szilner",
"S.",
""
],
[
"Ur",
"C. A.",
""
],
[
"Corradi",
"L.",
""
],
[
"Marginean",
"N.",
""
],
[
"Pollarolo",
"G.",
""
],
[
"Stefanini",
"A. M.",
""
],
[
"Beghini",
"S.",
""
],
[
"Behera",
"B. R.",
""
],
[
"Fioretto",
"E.",
""
],
[
"Gadea",
"A.",
""
],
[
"Guiot",
"B.",
""
],
[
"Latina",
"A.",
""
],
[
"Mason",
"P.",
""
],
[
"Montagnoli",
"G.",
""
],
[
"Scarlassara",
"F.",
""
],
[
"Trotta",
"M.",
""
],
[
"de Angelis",
"G.",
""
],
[
"Della Vedova",
"F.",
""
],
[
"Farnea",
"E.",
""
],
[
"Haas",
"F.",
""
],
[
"Lenzi",
"S.",
""
],
[
"Lunardi",
"S.",
""
],
[
"Marginean",
"R.",
""
],
[
"Menegazzo",
"R",
""
],
[
"Napoli",
"D. R.",
""
],
[
"Nespolo",
"M.",
""
],
[
"Pokrovsky",
"I. V.",
""
],
[
"Recchia",
"F.",
""
],
[
"Romoli",
"M.",
""
],
[
"Salsac",
"M. -D.",
""
],
[
"Soic",
"N.",
""
],
[
"Valiente-Dobon",
"J. J.",
""
]
] |
0707.0427 | Mikael de la Salle | Mikael de la Salle | Complete isometries between subspaces of noncommutative Lp-spaces | 30 pages; revised version of the paper with previous title
"Equimeasurabily and isometries in noncommutative Lp-spaces". Changes in the
title, presentation and content. Added results on unbounded operators, and
applications | Journal of Operator Theory, 64 (2010), no. 2, 265-298 | null | null | math.OA math.FA | null | We prove some noncommutative analogues of a theorem by Plotkin and Rudin
about isometries between subspaces of Lp-spaces. Let 0<p<\infty, p not an even
integer. The main result of this paper states that in the category of unital
subspaces of noncommutative probability Lp-spaces, under some boundedness
condition, the unital completely isometric maps come from *-isomorphisms of the
underlying von Neumann algebras.
Some applications are given, including to non commutative H^p spaces.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 14:39:08 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Dec 2007 17:58:29 GMT"
}
] | 2017-11-07T00:00:00 | [
[
"de la Salle",
"Mikael",
""
]
] |
0707.0428 | Reinhard Prix | Reinhard Prix | Template-based searches for gravitational waves: efficient lattice
covering of flat parameter spaces | 10 pages, submitted to CQG for proceedings of GWDAW11 | Class.Quant.Grav.24:S481-S490,2007 | 10.1088/0264-9381/24/19/S11 | LIGO-P070030-02-Z | gr-qc | null | The construction of optimal template banks for matched-filtering searches is
an example of the sphere covering problem. For parameter spaces with
constant-coefficient metrics a (near-) optimal template bank is achieved by the
A_n* lattice, which is the best lattice-covering in dimensions n <= 5, and is
close to the best covering known for dimensions n <= 16. Generally this
provides a substantially more efficient covering than the simpler hyper-cubic
lattice. We present an algorithm for generating lattice template banks for
constant-coefficient metrics and we illustrate its implementation by generating
A_n* template banks in n=2,3,4 dimensions.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 14:51:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Prix",
"Reinhard",
""
]
] |
0707.0429 | Sean McReynolds | Sean McReynolds | The Axion from Five-Dimensional Supergravity | 11 pages | null | null | null | hep-ph | null | We consider the axion arising from five-dimensional supergravity in the
presence of boundaries. We find the approximate bosonic effective action to
estimate the lower bound on the "Peccei-Quinn" energy scale with a flat bulk.
With a warped bulk, one can obtain a scale within the standard window; this
puts a bound on the required curvature scale relative to the proper separation
between boundaries. We comment on the scalar potential that may ruin the
strong-CP resolution, and the effective derivative coupling to matter in 5D
hypermultiplets.
| [
{
"version": "v1",
"created": "Tue, 3 Jul 2007 14:53:22 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"McReynolds",
"Sean",
""
]
] |
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