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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0708.1549 | Chunhui Chen | BaBar Collaboration: B. Aubert, et al | Improved Measurement of Time-Dependent CP Asymmetries and the CP-Odd
Fraction in the Decay B0->D*+D*- | Minor changes of the text and reference for the publication | Phys.Rev.D76:111102,2007 | 10.1103/PhysRevD.76.111102 | SLAC-PUB-12725 | hep-ex | null | We present an updated measurement of the CP-odd fraction and the
time-dependent CP asymmetries in the decay B0->D*+D*-using (383 +/- 4) \times
10^{6} BB pairs collected with the Babar detector. We determine the CP-odd
fraction to be $0.143\pm0.034\stat\pm0.008\syst$. The time-dependent CP
asymmetry parameters are determined to be $C_+ = -0.05\pm 0.14\stat \pm
0.02\syst$ and $S_+ = -0.72 \pm 0.19\stat \pm 0.05\syst$. The non-zero value of
the measured $S_+$ indicates the evidence of CP violation at the $3.7 \sigma$
confidence level.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 08:07:03 GMT"
},
{
"version": "v2",
"created": "Wed, 2 Jan 2008 21:04:57 GMT"
}
] | 2010-04-12T00:00:00 | [
[
"BaBar Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0708.1550 | Giuseppe Della Sala | Giuseppe Della Sala | Liouville-type theorems for foliations with complex leaves | 31 pages, no figures | null | null | null | math.CV | null | We discuss various problems regarding the structure of the foliation of some
foliated submanifolds S of C^n, in particular Levi flat ones. As a general
scheme, we suppose that S is bounded along a coordinate (or a subset of
coordinates), and prove that the leaves of its foliation are complex planes.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 08:34:58 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Della Sala",
"Giuseppe",
""
]
] |
0708.1551 | Chengming Bai | Chengming Bai | Left-symmetric Bialgebras and An Analogue of the Classical Yang-Baxter
Equation | 44 pages | Communications in Contemporary Mathematics 10 (2008) 221-260 | 10.1142/S0219199708002752 | null | math.QA math-ph math.MP | null | We introduce a notion of left-symmetric bialgebra which is an analogue of the
notion of Lie bialgebra. We prove that a left-symmetric bialgebra is equivalent
to a symplectic Lie algebra with a decomposition into a direct sum of the
underlying vector spaces of two Lagrangian subalgebras. The latter is called a
parak\"ahler Lie algebra or a phase space of a Lie algebra in mathematical
physics. We introduce and study coboundary left-symmetric bialgebras and our
study leads to what we call "$S$-equation", which is an analogue of the
classical Yang-Baxter equation. In a certain sense, the $S$-equation associated
to a left-symmetric algebra reveals the left-symmetry of the products. We show
that a symmetric solution of the $S$-equation gives a parak\"ahler Lie algebra.
We also show that such a solution corresponds to the symmetric part of a
certain operator called "${\cal O}$-operator", whereas a skew-symmetric
solution of the classical Yang-Baxter equation corresponds to the
skew-symmetric part of an ${\cal O}$-operator. Thus a method to construct
symmetric solutions of the $S$-equation (hence parak\"ahler Lie algebras) from
${\cal O}$-operators is provided. Moreover, by comparing left-symmetric
bialgebras and Lie bialgebras, we observe that there is a clear analogue
between them and, in particular, parak\"ahler Lie groups correspond to
Poisson-Lie groups in this sense.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 08:49:50 GMT"
}
] | 2008-04-24T00:00:00 | [
[
"Bai",
"Chengming",
""
]
] |
0708.1552 | Varun Raghunathan | Varun Raghunathan, David Borlaug, Robert Rice, and Bahram Jalali | Demonstration of a mid infrared silicon Raman amplifier | 8 pages, 5 figures | null | 10.1364/OE.15.014355 | null | physics.optics | null | We demonstrate for the first time a mid infrared silicon Raman amplifier.
Amplification of 12 dB is reported for a signal at 3.39 micron wavelength. The
active medium was a 2.5 cm long silicon sample that was pumped with 5ns pulses
at 2.88 micron. The absence of the nonlinear losses which severely limit the
performance of silicon Raman devices in the near infrared combined with
unsurpassed crystal quality, high thermal conductivity render silicon a very
attractive Raman medium. Such a technology can potentially extend silicon
photonics application beyond data communication in the near infrared and into
the mid infrared world of remote sensing, biochemical detection and laser
medicine.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 09:14:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Raghunathan",
"Varun",
""
],
[
"Borlaug",
"David",
""
],
[
"Rice",
"Robert",
""
],
[
"Jalali",
"Bahram",
""
]
] |
0708.1553 | Huanjun Zhang | Guoli Liu, Huanjun Zhang | Single top production associated with a neutral scalar at LHC in
topcolor-assisted technicolor | 7 pages, 3 figs | null | 10.1088/1674-1137/32/9/004 | null | hep-ph | null | The topcolor-assisted technicolor (TC2) model predicts a number of neutral
scalars like the top-pion ($\pi^0_t$) and the top-Higgs ($h^0_t$). These
scalars have flavor-changing neutral-current (FCNC) top quark couplings, among
which the top-charm transition couplings may be sizable. Such FCNC couplings
induce single top productions associated with a neutral scalar at the CERN
Large Hadron Collider (LHC) through the parton processes $cg \to t \pi_t^0$ and
$cg \to t h_t^0$. In this note we examine these productions and find their
production rates can exceed the $3\sigma$ sensitivity of the LHC in a large
part of parameter space. Since in the Standard Model and the minimal
supersymmetric model such rare productions have unobservably small production
rates at the LHC, these rare processes will serve as a good probe for the TC2
model.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 09:14:31 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Liu",
"Guoli",
""
],
[
"Zhang",
"Huanjun",
""
]
] |
0708.1554 | Hai-Long Her | Hai-Long Her | Floer Homology for Symplectomorphism | 41 pages | null | null | null | math.SG | null | Let (M,\omega) be a compact symplectic manifold, and \phi be a symplectic
diffeomorphism on M, we define a Floer-type homology FH_*(\phi) which is a gen-
eralization of Floer homology for symplectic fixed points defined by Dostoglou
and Salamon for monotone symplectic manifolds. These homology groups are
modules over a suitable Novikov ring and depend only on \phi up to a
Hamiltonian isotopy.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 09:50:37 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Her",
"Hai-Long",
""
]
] |
0708.1555 | Vadim Varlamov | V. V. Varlamov | Functions of representations of the class 1 on the homogeneous spaces of
the de Sitter group | 2 pages | Differential Equations, Theory of Functions, and Applications.
International Conference Dedicated to the Centennial of Academician I. N.
Vekua (May 28 - June 2, 2007, Novosibirsk, Russia). Abstracts, P. 410-411 | null | null | math-ph math.MP | null | Matrix elements and spherical functions of irreducible representations of the
de Sitter group are studied on the various homogeneous spaces of this group.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 09:53:13 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Varlamov",
"V. V.",
""
]
] |
0708.1556 | Seppo Hiltunen | Seppo I. Hiltunen | Seip's differentiability concepts as a particular case of the
Bertram--Gloeckner--Neeb construction | Comments: 32 pages, AmSLaTeX; versions 2--7: correction of misprints
and minor mistakes, improvement of unhappy wordings, Proposition "C_{Se0} is
BGN" added on page 22 in v2, (7) "locality" added to Proposition 47(=v1:46)
in v3 | null | null | null | math.FA | null | From the point of view of unification of differentiation theory, it is of
interest to note that the general construction principle of Bertram, Gloeckner
and Neeb leading to a C^k differentiability concept from a given C^0 one,
besides subsuming the Keller--Bastiani C_c^k differentiabilities on real
Hausdorff locally convex spaces, also does the same to the "arc-generated"
interpretation of the Lipschitz theory of differentiation by Frolicher and
Kriegl, and likewise to the "compactly generated" theory of Seip's continuous
differentiabilities. In this article, we give the details of the proof for the
assertion concerning Seip's theory. We also give an example indicating that the
premises in Seip's various inverse and implicit function theorems may be too
strong in order for these theorems to have much practical value. Also included
is a presentation of the BGN--setting reformulated so as to be consistent with
the Kelley--Morse--Godel--Bernays--von Neumann type approach to set theory, as
well as a treatment of the function space constructions and development of
their basic properties needed in the proof of the main result.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 20:42:19 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Aug 2007 15:31:08 GMT"
},
{
"version": "v3",
"created": "Mon, 20 Aug 2007 15:24:24 GMT"
},
{
"version": "v4",
"created": "Fri, 24 Aug 2007 16:59:40 GMT"
},
{
"version": "v5",
"created": "Mon, 27 Aug 2007 12:41:38 GMT"
},
{
"version": "v6",
"created": "Mon, 10 Sep 2007 22:55:26 GMT"
},
{
"version": "v7",
"created": "Fri, 21 Dec 2007 11:20:51 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Hiltunen",
"Seppo I.",
""
]
] |
0708.1557 | Andrzej Frydryszak | A. M. Frydryszak | Nilpotent Fuzz | 10 pages, no figures, talk given at the XVIth International
Colloquium on Integrable Systems and Quantum symmetries (ISQS-16), Prague
2007. New references added. Properties of the first order nilpotent curves
given | Rept.Math.Phys.61:229-237,2008 | 10.1016/S0034-4877(08)80011-0 | null | hep-th | null | We present a construction of the formalism where fundamental variables are
nilpotent, but in contrast to the supermathematics, commutative. This gives
another possibility to realize classically the Pauli exclusion principle. We
sketch the relevant formalism and discuss simple model of the nilpotent
oscillator to illustrate the generalized nilpotent mechanics.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 09:55:08 GMT"
},
{
"version": "v2",
"created": "Sat, 8 Dec 2007 17:57:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Frydryszak",
"A. M.",
""
]
] |
0708.1558 | Luca Giuzzi | A. Aguglia, L. Giuzzi | Construction of a 3-Dimensional MDS code | 8 Pages Minor typesetting changes; dedication | Contributions to Discrete Mathematics 3 no. 1: 39-46 (2007) | null | null | cs.IT math.IT | null | In this paper, we describe a procedure for constructing $q$--ary
$[N,3,N-2]$--MDS codes, of length $N\leq q+1$ (for $q$ odd) or $N\leq q+2$ (for
$q$ even), using a set of non--degenerate Hermitian forms in $PG(2,q^2)$.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 10:26:31 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Sep 2007 13:45:26 GMT"
}
] | 2009-07-19T00:00:00 | [
[
"Aguglia",
"A.",
""
],
[
"Giuzzi",
"L.",
""
]
] |
0708.1559 | Zhi-Yong Wang | Zhi-Yong Wang, Cai-Dong Xiong | Investigation on the superluminality of evanescent modes via quantum
Lorentz transformation | 15 pages, no figure | null | null | null | quant-ph | null | Applying the fact that guided photons inside a waveguide can be treated as
massive particles, one can study the superluminality of evanescent modes via
showing that a massive particle can propagate over a spacelike interval, which
corresponds to quantum tunneling effects. For this purpose, we treat the
particle as a quantum reference frame, while attach an inertia observer to a
classical reference frame, and then quantize the formulae for the Lorentz
transformation between the quantum and classical reference frames, from which
we obtain the conclusion that, owing to the Heisenberg's uncertainty relation,
the particle can propagate over a spacelike interval.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 10:26:53 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Aug 2007 15:15:36 GMT"
},
{
"version": "v3",
"created": "Mon, 7 Apr 2008 02:27:32 GMT"
},
{
"version": "v4",
"created": "Mon, 12 May 2008 00:35:42 GMT"
}
] | 2008-05-12T00:00:00 | [
[
"Wang",
"Zhi-Yong",
""
],
[
"Xiong",
"Cai-Dong",
""
]
] |
0708.1560 | Ralf Gramlich | Ralf K\"ohl | Defining amalgams of compact Lie groups | null | J. Lie Theory 16 (2006), 1-18 | null | null | math.GR | null | For $n \geq 2$ let $\Delta$ be a Dynkin diagram of rank $n$ and let $I = {1,
>..., n}$ be the set of labels of $\Delta$. A group $G$ admits a weak Phan
system of type $\Delta$ over $\mathbb{C}$ if $G$ is generated by subgroups
$U_i$, $i \in I$, which are central quotients of simply connected compact
semisimple Lie groups of rank one, and contains subgroups $U_{i,j} = \gen{U_i
,U_j}$, $i \neq j \in I$, which are central quotients of simply connected
compact semisimple Lie groups of rank two such that $U_i$ and $U_j$ are rank
one subgroups of $U_{i,j}$ corresponding to a choice of a maximal torus and a
fundamental system of roots for $U_{i,j}$. It is shown in this article that $G$
then is a central quotient of the simply connected compact semisimple Lie group
whose complexification is the simply connected complex semisimple Lie group of
type $\Delta$.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 11:50:37 GMT"
}
] | 2011-08-18T00:00:00 | [
[
"Köhl",
"Ralf",
""
]
] |
0708.1561 | Jerzy Lukierski | M. Daszkiewicz (IFT, Wroclaw University), J. Lukierski (IFT, Wroclaw
University), M. Woronowicz (IFT, Wroclaw University) | Towards Quantum Noncommutative $\kappa$-deformed Field Theory | LaTeX, 16 pages. V2: some clarifications supplemented, two formulas
added. V3: three references added, version in press in Physical Review D | Phys.Rev.D77:105007,2008 | 10.1103/PhysRevD.77.105007 | null | hep-th | null | We introduce new $\kappa$-star product describing the multiplication of
quantized $\kappa$-deformed free fields. The $\kappa$-deformation of local free
quantum fields originates from two sources: noncommutativity of space-time and
the $\kappa$-deformation of field oscillators algebra - we relate these two
deformations. We demonstrate that for suitable choice of $\kappa$-deformed
field oscillators algebra the $\kappa$-deformed version of microcausality
condition is satisfied, and it leads to the deformation of the Pauli-Jordan
commutation function defined by the $\kappa$-deformed mass shell. We show by
constructing the $\kappa$-deformed Fock space that the use of $\kappa$-deformed
oscillator algebra permits to preserve the bosonic statistics of n-particle
states. The proposed star product is extended to the product of $n$ fields,
which for $n=4$ defines the interaction vertex in perturbative description of
noncommutative quantum $\lambda\phi^4$ field theory. It appears that the
classical fourmomentum conservation law is satisfied at the interaction
vertices.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 11:47:22 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Sep 2007 14:27:14 GMT"
},
{
"version": "v3",
"created": "Wed, 26 Mar 2008 18:57:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Daszkiewicz",
"M.",
"",
"IFT, Wroclaw University"
],
[
"Lukierski",
"J.",
"",
"IFT, Wroclaw\n University"
],
[
"Woronowicz",
"M.",
"",
"IFT, Wroclaw University"
]
] |
0708.1562 | Par M. Kurlberg | John B. Friedlander, Par Kurlberg, Igor E. Shparlinski | Products in Residue Classes | 18 pages | null | null | null | math.NT | null | We consider a problem of P. Erdos, A. M. Odlyzko and A. Sarkozy about the
representation of residue classes modulo m by products of two not too large
primes. While it seems that even the Extended Riemann Hypothesis is not
powerful enough to achieve the expected results, here we obtain some
unconditional results ``on average'' over moduli m and residue classes modulo m
and somewhat stronger results when the average is restricted to prime moduli m
= p. We also consider the analogous question wherein the primes are replaced by
easier sequences so, quite naturally, we obtain much stronger results.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 12:20:26 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Friedlander",
"John B.",
""
],
[
"Kurlberg",
"Par",
""
],
[
"Shparlinski",
"Igor E.",
""
]
] |
0708.1563 | Zhiqin Lu | Zhiqin Lu | On the ground state of quantum layers | null | null | null | null | math.DG math-ph math.MP | null | We provide some new results of the ground state of quantum layers.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 12:46:30 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Lu",
"Zhiqin",
""
]
] |
0708.1564 | Stasinos Konstantopoulos | Stasinos Konstantopoulos | Learning Phonotactics Using ILP | null | Special Issue of the WEB-SLS Journal: The Language Sections of the
ESSLLI-01 Student Session. 2002 | null | null | cs.CL | null | This paper describes experiments on learning Dutch phonotactic rules using
Inductive Logic Programming, a machine learning discipline based on inductive
logical operators. Two different ways of approaching the problem are
experimented with, and compared against each other as well as with related work
on the task. The results show a direct correspondence between the quality and
informedness of the background knowledge and the constructed theory,
demonstrating the ability of ILP to take good advantage of the prior domain
knowledge available. Further research is outlined.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 13:09:27 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Konstantopoulos",
"Stasinos",
""
]
] |
0708.1565 | Vincent Poireau | The BABAR Collaboration: B. Aubert, et al | Study of Resonances in Exclusive B Decays to Dbar(*)D(*)K | 8 pages, 2 figures; submitted to Phys. Rev. D (Rapid Communications);
v2 corrects treatment of errors on X(3872) mass and width | Phys.Rev.D77:011102,2008 | 10.1103/PhysRevD.77.011102 | null | hep-ex | null | We present a study of resonances in exclusive decays of $B$ mesons to
$\bar{D}^{(*)} D^{(*)} K$. We report the observation of the decays $B \to
\Dbar^{(*)} D^+_{s1}(2536)$ where the $D^+_{s1}(2536)$ is reconstructed in the
$D^{*0}K^+$ and $D^{*+} K^0_S$ decay channels. We report also the observation
of the decays $B \to \psi(3770) K$ where the $\psi(3770)$ decays to $\Dbar^0
D^0$ and $D^- D^+$. In addition, we present the observation of an enhancement
for the $\Dbar^{*0} D^0$ invariant mass in the decays $B \to \Dbar^{*0} D^0 K$,
at a mass of $(3875.1 {}^{+0.7}_{-0.5} \pm 0.5)$ MeV/$c^2$ with a width of
$(3.0 {}^{+1.9}_{-1.4} \pm 0.9)$ MeV (the first errors are statistical and the
second are systematic). Branching fractions and spin studies are shown for the
three resonances. The results are based on 347 fb$^{-1}$ of data collected with
the BaBar detector at the PEP-II $B$ factory.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 13:15:27 GMT"
},
{
"version": "v2",
"created": "Thu, 8 Nov 2007 11:51:49 GMT"
}
] | 2010-04-12T00:00:00 | [
[
"The BABAR Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0708.1566 | K Rao Balaji | K. Balaji Rao | Markov Chain Modelling for Reliability Estimation of Engineering Systems
at Different Scales - Some Considerations | 10 pages (including cover page) International Conference on Civil
Engineering in the New Millennium: Opportunities and Challenges, January
11-14, 2007 | null | null | null | stat.AP stat.ME | null | The concepts of probability, statistics and stochastic theory are being
successfully used in structural engineering. Markov Chain modelling is a simple
stochastic process model that has found its application in both describing
stochastic evolution of system and in system reliability estimation. The recent
developments in Markov Chain Monte Carlo and the possible integration of
Bayesian theory within Markov Chain theory have enhanced its application
possibilities. However, the application possibility can be furthered to range
over wider scales of application (perhaps from nano- to macro-) by considering
the developments in Physics (in particular Quantum Physics). This paper tries
to present the results of quantum physics that would help in interpretation of
transition probability matrix. However, care has to be taken in the choice of
densities in computing the transition probability matrix. The paper is based on
available literature, and the aim is only to make an attempt to show how Markov
Chain can be used to model systems at various scales.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 13:36:44 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Rao",
"K. Balaji",
""
]
] |
0708.1567 | Norbert Schuch | Norbert Schuch, Michael M. Wolf, Frank Verstraete, J. Ignacio Cirac | Strings, Projected Entangled Pair States, and variational Monte Carlo
methods | 4 pages. v2: Submitted version, containing more numerical data.
Changed title and renamed "string states" to "string-bond states" to comply
with PRL conventions. v3: Accepted version, Journal-Ref. added (title differs
from journal) | Phys. Rev. Lett. 100, 040501 (2008) | 10.1103/PhysRevLett.100.040501 | null | quant-ph cond-mat.str-el | null | We introduce string-bond states, a class of states obtained by placing
strings of operators on a lattice, which encompasses the relevant states in
Quantum Information. For string-bond states, expectation values of local
observables can be computed efficiently using Monte Carlo sampling, making them
suitable for a variational abgorithm which extends DMRG to higher dimensional
and irregular systems. Numerical results demonstrate the applicability of these
states to the simulation of many-body sytems.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 21:54:09 GMT"
},
{
"version": "v2",
"created": "Fri, 26 Oct 2007 16:19:45 GMT"
},
{
"version": "v3",
"created": "Fri, 4 Apr 2008 16:27:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schuch",
"Norbert",
""
],
[
"Wolf",
"Michael M.",
""
],
[
"Verstraete",
"Frank",
""
],
[
"Cirac",
"J. Ignacio",
""
]
] |
0708.1568 | Ljudmila A. Bordag | Ljudmila A. Bordag, Ruediger Frey | Nonlinear option pricing models for illiquid markets: scaling properties
and explicit solutions | 26 pages, 7 figures, 25 references | book: "Nonlinear Models in Mathematical Finance. New Research
Trends in Option Pricing.", 2009, pp103-130; ISBN 978-1-60456-931-5, Nova
Science Publicher, Inc. | null | null | q-fin.PR math.AP math.GR | null | Several models for the pricing of derivative securities in illiquid markets
are discussed. A typical type of nonlinear partial differential equations
arising from these investigation is studied. The scaling properties of these
equations are discussed. Explicit solutions for one of the models are obtained
and studied.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 14:09:02 GMT"
}
] | 2010-04-08T00:00:00 | [
[
"Bordag",
"Ljudmila A.",
""
],
[
"Frey",
"Ruediger",
""
]
] |
0708.1569 | Xin-Zhong Yan | Xin-Zhong Yan, Yousef Romiah, and C. S. Ting | Electric Transport Theory of Dirac Fermions in Graphene | 6 pages, 3 figures | Phys. Rev. B 77, 125409 (2008) | 10.1103/PhysRevB.77.125409 | null | cond-mat.str-el | null | Using the self-consistent Born approximation to the Dirac fermions under
finite-range impurity scatterings, we show that the current-current correlation
function is determined by four-coupled integral equations. This is very
different from the case for impurities with short-range potentials. As a test
of the present approach, we calculate the electric conductivity in graphene for
charged impurities with screened Coulomb potentials. The obtained conductivity
at zero temperature varies linearly with the carrier concentration, and the
minimum conductivity at zero doping is larger than the existing theoretical
predictions, but still smaller than that of the experimental measurement. The
overall behavior of the conductivity obtained by the present calculation at
room temperature is similar to that at zero temperature except the minimum
conductivity is slightly larger.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 14:15:59 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Aug 2007 17:02:03 GMT"
},
{
"version": "v3",
"created": "Wed, 19 Dec 2007 16:04:23 GMT"
}
] | 2008-06-10T00:00:00 | [
[
"Yan",
"Xin-Zhong",
""
],
[
"Romiah",
"Yousef",
""
],
[
"Ting",
"C. S.",
""
]
] |
0708.1570 | Nikolay Kiselev Mr. | N. S. Kiselev, I. E. Dragunov, V. Neu, U. K. Roessler, A. N. Bogdanov | Theoretical analysis of magnetic force microscopy contrast in
multidomain states of magnetic superlattices with perpendicular anisotropy | 7 pages, 6 figures | null | 10.1063/1.2844312 | null | cond-mat.mes-hall | null | Recently synthesized magnetic multilayers with strong perpendicular
anisotropy exhibit unique magnetic properties including the formation of
specific multidomain states. In particular, antiferromagnetically coupled
multilayers own rich phase diagrams that include various multidomain ground
states. Analytical equations have been derived for the stray-field components
of these multidomain states in perpendicular multilayer systems. In particular,
closed expressions for stray fields in the case of ferromagnetic and
antiferromagnetic stripes are presented. The theoretical approach provides a
basis for the analysis of magnetic force microscopy (MFM) images from this
novel class of nanomagnetic systems. Peculiarities of the MFM contrast have
been calculated for realistic tip models. These characteristic features in the
MFM signals can be employed for the investigations of the different multidomain
modes. The obtained results are applied for the analysis of multidomain modes
that have been reported earlier in the literature from experiments on [Co/Cr]Ru
superlattices.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 12:35:44 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Oct 2007 19:06:35 GMT"
},
{
"version": "v3",
"created": "Thu, 25 Oct 2007 13:13:34 GMT"
},
{
"version": "v4",
"created": "Tue, 30 Oct 2007 18:13:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kiselev",
"N. S.",
""
],
[
"Dragunov",
"I. E.",
""
],
[
"Neu",
"V.",
""
],
[
"Roessler",
"U. K.",
""
],
[
"Bogdanov",
"A. N.",
""
]
] |
0708.1571 | Francesca Aicardi | Francesca Aicardi | Symmetries of quadratic forms classes and of quadratic surds continued
fractions. Part I: A Poincar\'e model for the de Sitter world | 33 pages, 22 figures | null | null | null | math.NT math.GM | null | The problem of the classification of the indefinite binary quadratic forms
with integer coefficients is solved introducing a special partition of the de
Sitter world, where the coefficients of the forms lie, into separate domains.
Every class of indefinite forms, under the action of the special linear group
acting on the integer plane lattice, has a finite and well defined number of
representatives inside each one of such domains. This property belongs
exclusively to rational points on the one-sheeted hyperboloid. In the second
part we will show how to obtain the symmetry type of a class as well as its
number of points in all domains from a sole representative of that class.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 14:35:08 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Mar 2008 08:33:50 GMT"
}
] | 2008-03-27T00:00:00 | [
[
"Aicardi",
"Francesca",
""
]
] |
0708.1572 | David Delphenich | D. H. Delphenich | Groups of motions and mechanics I: point mechanics | 51 pages, no figures | null | null | null | gr-qc math-ph math.MP | null | It is shown that physical mechanics for pointlike bodies can be effectively
modeled in terms of the action of transformation groups that act as symmetries
of the solutions of systems of differential equations that describe the
integrability of dynamical states. The equations of motion are then obtained
from these integrability equations for the dynamical states. It is also
observed that the functions that define the components of a dynamical state
represent a set of mechanical constitutive laws. The variational formulation of
mechanics is shown to be a specialization of these principles.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 15:08:41 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Delphenich",
"D. H.",
""
]
] |
0708.1573 | Pinaki Majumdar | Kalpataru Pradhan, Anamitra Mukherjee and Pinaki Majumdar | The Distinct Effects of Homogeneous Weak Disorder and Dilute Strong
Scatterers on Phase Competetion in the Manganites | 4 pages pdflatex, 4 jpg figs, published | Phys. Rev. Lett. vol 99, 147206 (2007) | 10.1103/PhysRevLett.99.147206 | null | cond-mat.str-el | null | We study the two orbital double-exchange model in two dimensions in the
presence of antiferromagnetic (AF) superexchange, strong Jahn-Teller coupling,
and substitutional disorder. At hole doping x=0.5 we explore the `bicritical'
regime where the energy of a ferromagnetic metal and a charge and orbital
ordered (CO-OO) CE state are closely balanced, and compare the impact of weak
homogeneous disorder to that of a low density of strong scatterers. Even
moderate homogeneous disorder suppresses the CE-CO-OO phase and leads to a
glass with nanoscale correlations. Dilute strong scatterers of comparable
strength, however, convert the CE-CO-OO phase to a phase separated state with
ferromagnetic and AF-CO-OO clusters. We provide the first spatial description
of these phenomena and compare our results in detail to experiments on the
half-doped manganites.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 15:23:51 GMT"
},
{
"version": "v2",
"created": "Fri, 5 Oct 2007 12:09:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pradhan",
"Kalpataru",
""
],
[
"Mukherjee",
"Anamitra",
""
],
[
"Majumdar",
"Pinaki",
""
]
] |
0708.1574 | Dmitry Kaledin | D. Kaledin | Cartier isomorphism and Hodge Theory in the non-commutative case | LaTeX2e, 34 pages. Fixed some typos. Final version | null | null | null | math.AG math.KT | null | These are lecture notes from Clay Summer School in Goettingen, in 2006; the
lectures were an attempt at an elementary introduction to math.KT/0611623.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 15:44:04 GMT"
},
{
"version": "v2",
"created": "Sat, 2 Feb 2008 12:54:23 GMT"
}
] | 2008-02-02T00:00:00 | [
[
"Kaledin",
"D.",
""
]
] |
0708.1575 | Zbigniew Fiedorowicz | Shaun Ault, Zbigniew Fiedorowicz | Symmetric Homology of Algebras | 14 pages, references and discussion of recent related work by Vrecica
and Zivaljevic has been added | null | null | null | math.AT | null | In this note, we outline the general development of a theory of symmetric
homology of algebras, an analog of cyclic homology where the cyclic groups are
replaced by symmetric groups. This theory is developed using the framework of
crossed simplicial groups and the homological algebra of module-valued
functors. The symmetric homology of group algebras is related to stable
homotopy theory. Two spectral sequences for computing symmetric homology are
constructed. The relation to cyclic homology is discussed and some conjectures
and questions towards further work are discussed.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 19:36:55 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Aug 2007 21:11:52 GMT"
},
{
"version": "v3",
"created": "Sun, 7 Oct 2007 00:03:04 GMT"
},
{
"version": "v4",
"created": "Mon, 5 Nov 2007 19:14:25 GMT"
}
] | 2007-11-05T00:00:00 | [
[
"Ault",
"Shaun",
""
],
[
"Fiedorowicz",
"Zbigniew",
""
]
] |
0708.1576 | Toru Sato | K. Tsuji and T. Sato | Study of K^0 \to pi^- e^+ nu_e e^+ e^- in chiral perturbation theory | 17 pages, 7 figures, figures and formula are added | Phys.Rev.D77:054022,2008 | 10.1103/PhysRevD.77.054022 | null | hep-ph | null | K^0 \to pi^- e^+ nu_e e^+ e^- decay is studied up to the next-to-leading
order O^4 in chiral perturbation theory. It is found that the O^4 terms
appreciably modifiy the shape of the invariant mass distribution of the leptons
and the energy spectrum of the neutrino.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 16:00:29 GMT"
},
{
"version": "v2",
"created": "Sat, 15 Mar 2008 08:38:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tsuji",
"K.",
""
],
[
"Sato",
"T.",
""
]
] |
0708.1577 | Carlos Dur\'an E. | C. E. Dur\'an, A. Rigas | Equivariant homotopy and deformations of diffeomorphisms | 10 pages | null | null | null | math.DG math.AT | null | We present a way of constructing and deforming diffeomorphisms of manifolds
endowed with a Lie group action. This is applied to the study of exotic
diffeomorphisms and involutions of spheres and to the equivariant homotopy of
Lie groups.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 14:16:15 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Durán",
"C. E.",
""
],
[
"Rigas",
"A.",
""
]
] |
0708.1578 | Augustin Skopal | A. Skopal, M. Vanko, T. Pribulla, D. Chochol, E. Semkov, M. Wolf, A.
Jones | Recent photometry of symbiotic stars - XII | 4 pages text, 12 figures, 18 tables, accepted for publication in
Astron. Nachrichten | null | 10.1002/asna.200710822 | null | astro-ph | null | We present new photometric observations of 15 symbiotic stars (EG And, Z And,
AE Ara, BF Cyg, CH Cyg, CI Cyg, V1329 Cyg, TX CVn, AG Dra, Draco C-1, RW Hya,
SY Mus, AR Pav, AG Peg, AX Per) covering their last orbital cycle(s) from
2003.9 to 2007.2. We obtained our data by both classical photoelectric and CCD
photometry. Main results are: EG And brightened by about 0.3 mag in U from
2003. A 0.5 mag deep primary minimum developed in the U light curve (LC) at the
end of 2006. Z And continues its recent activity that began during the 2000
autumn. A new small outburst started in summer of 2004 with the peak
U-magnitude of about 9.2. During the spring of 2006 the star entered a massive
outburst. It reached its historical maximum at U = 8.0 in 2006 July. AE Ara
erupted in 2006 February with Dm(vis) approx. 1.2 mag. BF Cyg entered a new
active stage in 2006 August. A brightness maximum (U approx. 9.4) was measured
during 2006 September. CH Cyg persists in a quiescent phase. During 2006 June -
December about 2 mag decline in all colours was measured. CI Cyg started a new
active phase during 2006 May - June. After 31 years it erupted by about 2 mag
in U. TX CVn maintains a bright stage with U approx. 10.5 from 2003. AG Dra
entered a new major outburst in 2006 June. It reached its maximum at U = 8.0 in
2006 September. AR Pav persists at a low level of the activity. AG Peg's LC
profile varies markedly during different orbital cycles. AX Per continues its
quiescent phase.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 18:35:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Skopal",
"A.",
""
],
[
"Vanko",
"M.",
""
],
[
"Pribulla",
"T.",
""
],
[
"Chochol",
"D.",
""
],
[
"Semkov",
"E.",
""
],
[
"Wolf",
"M.",
""
],
[
"Jones",
"A.",
""
]
] |
0708.1579 | Vicen\c{c} G\'omez Cerd\`a | Andreas Kaltenbrunner, Vicen\c{c} G\'omez, Ayman Moghnieh, Rodrigo
Meza, Josep Blat, Vicente L\'opez | Homogeneous temporal activity patterns in a large online communication
space | 17 pages, 10 figures, to be published in International Journal on
WWW/Internet | null | null | null | cs.NI | null | The many-to-many social communication activity on the popular technology-news
website Slashdot has been studied. We have concentrated on the dynamics of
message production without considering semantic relations and have found
regular temporal patterns in the reaction time of the community to a news-post
as well as in single user behavior. The statistics of these activities follow
log-normal distributions. Daily and weekly oscillatory cycles, which cause
slight variations of this simple behavior, are identified. A superposition of
two log-normal distributions can account for these variations. The findings are
remarkable since the distribution of the number of comments per users, which is
also analyzed, indicates a great amount of heterogeneity in the community. The
reader may find surprising that only a few parameters allow a detailed
description, or even prediction, of social many-to-many information exchange in
this kind of popular public spaces.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 00:29:03 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Kaltenbrunner",
"Andreas",
""
],
[
"Gómez",
"Vicenç",
""
],
[
"Moghnieh",
"Ayman",
""
],
[
"Meza",
"Rodrigo",
""
],
[
"Blat",
"Josep",
""
],
[
"López",
"Vicente",
""
]
] |
0708.1580 | James P. Crutchfield | Susanne Still, James P. Crutchfield, Christopher J. Ellison | Optimal Causal Inference: Estimating Stored Information and
Approximating Causal Architecture | 14 pages, 13 figures;
http://cse.ucdavis.edu/~cmg/compmech/pubs/oci.htm; Updated figures and
citations; added corrections and clarifications | null | null | null | cs.IT cond-mat.stat-mech cs.LG math.IT math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce an approach to inferring the causal architecture of stochastic
dynamical systems that extends rate distortion theory to use causal
shielding---a natural principle of learning. We study two distinct cases of
causal inference: optimal causal filtering and optimal causal estimation.
Filtering corresponds to the ideal case in which the probability distribution
of measurement sequences is known, giving a principled method to approximate a
system's causal structure at a desired level of representation. We show that,
in the limit in which a model complexity constraint is relaxed, filtering finds
the exact causal architecture of a stochastic dynamical system, known as the
causal-state partition. From this, one can estimate the amount of historical
information the process stores. More generally, causal filtering finds a graded
model-complexity hierarchy of approximations to the causal architecture. Abrupt
changes in the hierarchy, as a function of approximation, capture distinct
scales of structural organization.
For nonideal cases with finite data, we show how the correct number of
underlying causal states can be found by optimal causal estimation. A
previously derived model complexity control term allows us to correct for the
effect of statistical fluctuations in probability estimates and thereby avoid
over-fitting.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 19:13:29 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Aug 2010 23:46:24 GMT"
}
] | 2010-08-23T00:00:00 | [
[
"Still",
"Susanne",
""
],
[
"Crutchfield",
"James P.",
""
],
[
"Ellison",
"Christopher J.",
""
]
] |
0708.1581 | Matthias Franz | Anthony Bahri, Matthias Franz and Nigel Ray | The equivariant cohomology of weighted projective space | 11 pages; improved exposition | Math. Proc. Camb. Phil. Soc. 146 (2009), 395-405 | 10.1017/S0305004108001965 | null | math.AT math.AG | null | We describe the integral equivariant cohomology ring of a weighted projective
space in terms of piecewise polynomials, and thence by generators and
relations. We deduce that the ring is a perfect invariant, and prove a Chern
class formula for weighted projective bundles.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 19:35:23 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Sep 2007 19:45:11 GMT"
},
{
"version": "v3",
"created": "Sun, 18 May 2008 15:30:39 GMT"
}
] | 2009-04-15T00:00:00 | [
[
"Bahri",
"Anthony",
""
],
[
"Franz",
"Matthias",
""
],
[
"Ray",
"Nigel",
""
]
] |
0708.1582 | Kevin Purbhoo | Kevin Purbhoo and Frank Sottile | A Littlewood-Richardson rule for Grassmannian Permutations | 10 pages, colour diagrams. Corrected an example | null | null | null | math.CO | null | We give a combinatorial rule for computing intersection numbers on a flag
manifold which come from products of Schubert classes pulled back from
Grassmannian projections. This rule generalizes the known rule for
Grassmannians.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 19:35:58 GMT"
},
{
"version": "v2",
"created": "Sat, 3 May 2008 20:57:49 GMT"
}
] | 2008-05-03T00:00:00 | [
[
"Purbhoo",
"Kevin",
""
],
[
"Sottile",
"Frank",
""
]
] |
0708.1583 | Ralf Gramlich | Ralf K\"ohl, Hendrik Van Maldeghem | Intransitive geometries | null | Proc. Lond. Math. Soc. 93 (2006), 666-692 | null | null | math.GT math.GR | null | A lemma of Tits establishes a connection between the simple connectivity of
an incidence geometry and the universal completion of an amalgam induced by a
sufficiently transitive group of automorphisms of that geometry. In the present
paper, we generalize this lemma to intransitive geometries, thus opening the
door for numerous applications. We treat ourselves some amalgams related to
intransitive actions of finite orthogonal groups, as a first class of examples.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 19:55:45 GMT"
}
] | 2011-08-18T00:00:00 | [
[
"Köhl",
"Ralf",
""
],
[
"Van Maldeghem",
"Hendrik",
""
]
] |
0708.1584 | Timur Kamalov F. | Timur F. Kamalov | Physics of Non-Inertial Reference Frames | 7 pages, Latex | AIP Conference Proceedings Vol 1316, (2010), pp. 455-458 | 10.1063/1.3536452 | null | physics.class-ph physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Physics of non-inertial reference frames is a generalizing of Newton's laws
to any reference frames. The first, Law of Kinematic in non-inertial reference
frames reads: the kinematic state of a body free of forces conserves and
determinates a constant n-th order derivative with respect to time being equal
in absolute value to an invariant of the observer's reference frame. The
second, Law of Dynamic extended Newton's second law to non-inertial reference
frames and also contains additional variables there are higher derivatives of
coordinates. Dynamics Law in non-inertial reference frames reads: a force
induces a change in the kinematic state of the body and is proportional to the
rate of its change. It is mean that if the kinematic invariant of the reference
frame is n-th derivative with respect the time, then the dynamics of a body
being affected by the force F is described by the (n+1)-th differential
equation. The third, Law of Static in non-inertial reference frames reads: the
sum of all forces acting a body at rest is equal to zero.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 06:53:07 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 18:23:40 GMT"
},
{
"version": "v3",
"created": "Wed, 12 Sep 2007 04:07:36 GMT"
},
{
"version": "v4",
"created": "Thu, 5 Jun 2008 16:29:29 GMT"
},
{
"version": "v5",
"created": "Fri, 16 Apr 2010 22:53:39 GMT"
},
{
"version": "v6",
"created": "Wed, 21 Apr 2010 11:28:38 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Kamalov",
"Timur F.",
""
]
] |
0708.1585 | Darryl D. Holm | Darryl D. Holm | Applications of Poisson Geometry to Physical Problems | 139 pages; no figures. Submitted to the Proceedings of the Summer
School and Conference on Poisson Geometry, 4-22 July 2005, Trieste, Italy | GTM 17 (2011) 221-384 | 10.2140/gtm.2011.17.221 | null | math.DS math.CA nlin.SI | null | We consider Lagrangians in Hamilton's principle defined on the tangent space
$TG$ of a Lie group $G$. Invariance of such a Lagrangian under the action of
$G$ leads to the symmetry-reduced Euler-Lagrange equations called the
Euler-Poincar\'e equations. In this case, the invariant Lagrangian is defined
on the Lie algebra of the group and its Euler-Poincar\'e equations are defined
on the dual Lie algebra, where dual is defined by the operation of taking
variational derivative. On the Hamiltonian side, the Euler-Poincar\'e equations
are Lie-Poisson and they possess accompanying momentum maps, which encode both
their conservation laws and the geometry of their solution space.
The standard Euler-Poincar\'e examples are treated, including particle
dynamics, the rigid body, the heavy top and geodesic motion on Lie groups.
Additional topics deal with Fermat's principle, the $\mathbb{R}^3$ Poisson
bracket, polarized optical traveling waves, deformable bodies (Riemann
ellipsoids) and shallow water waves, including the integrable shallow water
wave systems associated with geodesic motion on the diffeomorphisms. The
lectures end with the semidirect-product Euler-Poincar\'e reduction theorem for
ideal fluid dynamics. This theorem introduces the Euler--Poincar\'e variational
principle for incompressible and compressible motions of ideal fluids, with
applications to geophysical fluids. It also leads to their Lie-Poisson
Hamiltonian formulation.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 20:43:55 GMT"
}
] | 2016-01-20T00:00:00 | [
[
"Holm",
"Darryl D.",
""
]
] |
0708.1586 | Michael Forger | Michael Forger and Leandro G. Gomes (Instituto de Matem\'atica e
Estat\'istica, Universidade de S\~ao Paulo) | Multisymplectic and polysymplectic structures on fiber bundles | null | null | 10.1142/S0129055X13500189 | null | math.DG math-ph math.MP math.SG | null | We introduce the concepts of a multisymplectic structure and a polysymplectic
structure on a general fiber bundle over a general base manifold, define the
concept of the symbol of a multisymplectic form, which is a polysymplectic form
representing its leading order contribution, and prove Darboux theorems for the
existence of canonical local coordinates.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 20:58:08 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 22:02:50 GMT"
}
] | 2014-12-12T00:00:00 | [
[
"Forger",
"Michael",
"",
"Instituto de Matemática e\n Estatística, Universidade de São Paulo"
],
[
"Gomes",
"Leandro G.",
"",
"Instituto de Matemática e\n Estatística, Universidade de São Paulo"
]
] |
0708.1587 | Ravi Gomatam | Ravi Gomatam | Quantum theory and the observation problem | 19 pages | (1999) Journal of consciousness studies, 6 (11-12), 173-90 | null | null | quant-ph | null | Quantum theory is applicable, in principle, to both the microscopic and
macroscopic realms. It is therefore worthwhile to investigate whether it is
possible to evolve a quantum-compatible view of the properties and states of
macroscopic objects in everyday thinking. It will allow a realistic
interpretation of quantum theory in a manner directly consistent with the
observations. The construction of such a view will provide a solution to what I
term the observation problem. Toward solving the observation problem, I
identify a category of new objective properties called 'relational properties'
that are (so to speak) in-between primary and secondary properties. We
regularly associate such properties with everyday objects, and I discuss how in
fact these are quantum-compatible. If this relational-property viewpoint could
be worked into quantum theory, it would altogether avoid the measurement
problem, which is an artifact of our current inconsistent (albeit pragmatically
successful) strategy of retaining a classical view of the macroscopic world
while applying quantum theory to the microscopic world. Some implications of
the relational property viewpoint to neurobiological issues underlying
cognition are touched upon.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 21:03:27 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Gomatam",
"Ravi",
""
]
] |
0708.1588 | Milos Milosavljevic | Milos Milosavljevic, Ehud Nakar, Fan Zhang | Vorticity and Magnetic Field Generation from Initial Anisotropy in
Ultrarelativistic Gamma-Ray Burst Blastwaves | 4 pages, 1 figure | null | null | null | astro-ph | null | Because conical segments of quasispherical ultrarelativistic blastwaves are
causally disconnected on angular scales larger than the blastwave inverse
Lorentz factor, astrophysical blastwaves can sustain initial anisotropy,
imprinted by the process that drives the explosion, while they remain
relativistic. We show that initial angular energy fluctuations in
ultrarelativistic blastwaves imply a production of vorticity in the blastwave,
and calculate the vortical energy production rate. In gamma-ray burst (GRB)
afterglows, the number of vortical eddy turnovers as the shocked fluid crosses
the blastwave shell is about unity for marginally nonlinear anisotropy. Thus
the anisotropy must be nonlinear to explain the magnetic energy density
inferred in measured GRB spectra.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 22:31:17 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Milosavljevic",
"Milos",
""
],
[
"Nakar",
"Ehud",
""
],
[
"Zhang",
"Fan",
""
]
] |
0708.1589 | Peter Forrester | Peter J. Forrester | On the gap probability generating function at the spectrum edge in the
case of orthogonal symmetry | 12 pages, to appear Contemporary Mathematics (Proceedings)
`Integrable Systems, Random Matrices and Applications', edited by J. Baik, T.
Kriecherbauer and K. McLaughlin | null | null | null | math-ph math.MP | null | The gap probability generating function has as its coefficients the
probability of an interval containing exactly $k$ eigenvalues. For scaled
random matrices with orthogonal symmetry, and the interval at the hard or soft
spectrum edge, the gap probability generating functions have the special
property that they can be evaluated in terms of Painlev\'e transcendents. The
derivation of these results makes use of formulas for the same generating
function in certain scaled, superimposed ensembles expressed in terms of its
correlation functions. It is shown that by a judicious choice of the
superimposed ensembles, the scaled limit necessary to derive these formulas can
be rigorously justified by a straight forward analysis.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 01:47:27 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Forrester",
"Peter J.",
""
]
] |
0708.1590 | Yanir A. Rubinstein | Yanir A. Rubinstein | On the construction of Nadel multiplier ideal sheaves and the limiting
behavior of the Ricci flow | v2: 1. added details for the case n=1. 2. added some references. v3:
minor changes. To appear in Transactions of the American Mathematical Society | Trans. Amer. Math. Soc. 361 (2009), 5839-5850. | 10.1090/S0002-9947-09-04675-3 | null | math.DG | null | In this note we construct Nadel multiplier ideal sheaves using the Ricci flow
on Fano manifolds. This extends a result of Phong, Sesum and Sturm. These
sheaves, like their counterparts constructed by Nadel for the continuity
method, can be used to obtain an existence criterion for Kahler-Einstein
metrics.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 02:54:28 GMT"
},
{
"version": "v2",
"created": "Wed, 29 Aug 2007 22:24:35 GMT"
},
{
"version": "v3",
"created": "Wed, 7 Nov 2007 18:33:25 GMT"
}
] | 2009-07-23T00:00:00 | [
[
"Rubinstein",
"Yanir A.",
""
]
] |
0708.1591 | Masaki Izumi | Masaki Izumi | Every sum system is divisible | 22 pages | null | null | null | math.OA math.FA | null | We show that every sum system is divisible. Combined with B. V. R. Bhat and
R. Srinivasan's result, this shows that every product system arising from a sum
system (and every generalized CCR flow) is either of type I or type III. A
necessarily and sufficient condition for such a product system to be of type I
is obtained.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 02:56:13 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Izumi",
"Masaki",
""
]
] |
0708.1592 | Kamal Benslama | Kamal Benslama (for the ATLAS and CMS Collaborations) | Other Exotic Scenarios at the LHC | 7 pages, conference | null | null | CERN-ATL-PHYS-PUB-2006-027 | hep-ex | null | The considerable center-of-mass energy and luminosity provided by the Large
Hadron Collider (LHC) will ensure a discovery reach for new particles which
extends well into the multi-TeV region. ATLAS and CMS have carried out many
studies of the implications of this capability for Beyond the Standard Model
physics. In this paper, we summarize some key results of studies involving
non-susy models, such as extra-dimensions, little higgs, compositeness, and
left-right symmetric models.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 04:38:26 GMT"
}
] | 2019-08-14T00:00:00 | [
[
"Benslama",
"Kamal",
"",
"for the ATLAS and CMS Collaborations"
]
] |
0708.1593 | Adom Giffin | Adom Giffin and Ariel Caticha | Updating Probabilities with Data and Moments | Presented at the 27th International Workshop on Bayesian Inference
and Maximum Entropy Methods in Science and Engineering, Saratoga Springs, NY,
July 8-13, 2007. 10 pages, 1 figure V2 has a small typo in the end of the
appendix that was fixed. aj=mj+1 is now aj=m(k-j)+1 | null | 10.1063/1.2821302 | null | physics.data-an cs.IT math.IT math.ST physics.comp-ph physics.pop-ph stat.AP stat.CO stat.ME stat.TH | null | We use the method of Maximum (relative) Entropy to process information in the
form of observed data and moment constraints. The generic "canonical" form of
the posterior distribution for the problem of simultaneous updating with data
and moments is obtained. We discuss the general problem of non-commuting
constraints, when they should be processed sequentially and when
simultaneously. As an illustration, the multinomial example of die tosses is
solved in detail for two superficially similar but actually very different
problems.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 19:25:41 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 20:23:25 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Giffin",
"Adom",
""
],
[
"Caticha",
"Ariel",
""
]
] |
0708.1594 | Ambika G | K.P.Harikrishnan and G.Ambika | Resonance phenomena in discrete systems with bichromatic input signal | 17 pages, 16 figures, submitted to European Physical Journal | null | 10.1140/epjb/e2008-00083-3 | null | nlin.CD | null | We undertake a detailed numerical study of the twin phenomena of stochastic
and vibrational resonance in a discrete model system in the presence of
bichromatic input signal. A two parameter cubic map is used as the model that
combines the features of both bistable and threshold settings. Our analysis
brings out several interesting results, such as, the existence of a cross over
behaviour from vibrational to stochastic resonance and the possibility of using
stochastic resonance as a filter for the selective detection/transmission of
the component frequencies in a composite signal. The study also reveals a
fundamental difference between the bistable and threshold mechanisms with
respect to amplification of a multi signal input.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 04:01:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Harikrishnan",
"K. P.",
""
],
[
"Ambika",
"G.",
""
]
] |
0708.1595 | Laurent Freidel | Laurent Freidel and Kirill Krasnov | A New Spin Foam Model for 4d Gravity | 40 pages; (v2) published version | Class.Quant.Grav.25:125018,2008 | 10.1088/0264-9381/25/12/125018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from Plebanski formulation of gravity as a constrained BF theory we
propose a new spin foam model for 4d Riemannian quantum gravity that
generalises the well-known Barrett-Crane model and resolves the inherent to it
ultra-locality problem. The BF formulation of 4d gravity possesses two sectors:
gravitational and topological ones. The model presented here is shown to give a
quantization of the gravitational sector, and is dual to the recently proposed
spin foam model of Engle et al. which, we show, corresponds to the topological
sector. Our methods allow us to introduce the Immirzi parameter into the
framework of spin foam quantisation. We generalize some of our considerations
to the Lorentzian setting and obtain a new spin foam model in that context as
well.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 14:05:22 GMT"
},
{
"version": "v2",
"created": "Sat, 7 Jun 2008 11:25:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Freidel",
"Laurent",
""
],
[
"Krasnov",
"Kirill",
""
]
] |
0708.1596 | Lenny Fukshansky | Lenny Fukshansky | On similarity classes of well-rounded sublattices of $\mathbb Z^2$ | 27 pages, 2 figures; added a lemma on Diophantine approximation by
quotients of Pythagorean triples; final version to be published in Journal of
Number Theory | Journal of Number Theory, vol. 129 no. 10 (2009), pg. 2530-2556 | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A lattice is called well-rounded if its minimal vectors span the
corresponding Euclidean space. In this paper we study the similarity classes of
well-rounded sublattices of ${\mathbb Z}^2$. We relate the set of all such
similarity classes to a subset of primitive Pythagorean triples, and prove that
it has structure of a noncommutative infinitely generated monoid. We discuss
the structure of a given similarity class, and define a zeta function
corresponding to each similarity class. We relate it to Dedekind zeta of
${\mathbb Z}[i]$, and investigate the growth of some related Dirichlet series,
which reflect on the distribution of well-rounded lattices. Finally, we
construct a sequence of similarity classes of well-rounded sublattices of
${\mathbb Z}^2$, which gives good circle packing density and converges to the
hexagonal lattice as fast as possible with respect to a natural metric we
define.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 04:14:18 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Feb 2009 06:02:44 GMT"
}
] | 2009-08-25T00:00:00 | [
[
"Fukshansky",
"Lenny",
""
]
] |
0708.1597 | Jesse Fern | Jesse Fern, K. Birgitta Whaley | New lower bounds on the non-zero capacity of Pauli Channels | 10 pages, 5 figures, RevTeX4, accepted in Phys. Rev. A | Phys. Rev. A 78, 062335 (2008) | 10.1103/PhysRevA.78.062335 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study encodings that give the best known thresholds for the non-zero
capacity of quantum channels, i.e., the upper bound for correctable noise,
using an entropic approach to calculation of the threshold values. Our results
show that Pauli noise is correctable up to the hashing bound. For a
depolarizing channel, this approach allows one to achieve a non-zero capacity
for a fidelity (probability of no error) of f=0.80870.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 04:21:53 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Feb 2008 01:30:58 GMT"
},
{
"version": "v3",
"created": "Wed, 8 Oct 2008 07:33:50 GMT"
}
] | 2009-02-22T00:00:00 | [
[
"Fern",
"Jesse",
""
],
[
"Whaley",
"K. Birgitta",
""
]
] |
0708.1598 | HC Paul Lee | Sing-Guan Kong, Hong-Da Chen, Wen-Lang Fan, Jan Wigger, Andrew Torda,
and HC Lee | Genomes: at the edge of chaos with maximum information capacity | 4 pages, 3 figures, paper | null | null | null | q-bio.GN | null | We propose an order index, phi, which quantifies the notion of ``life at the
edge of chaos'' when applied to genome sequences. It maps genomes to a number
from 0 (random and of infinite length) to 1 (fully ordered) and applies
regardless of sequence length. The 786 complete genomic sequences in GenBank
were found to have phi values in a very narrow range, 0.037+/-0.027. We show
this implies that genomes are halfway towards being completely random, namely,
at the edge of chaos. We argue that this narrow range represents the
neighborhood of a fixed-point in the space of sequences, and genomes are driven
there by the dynamics of a robust, predominantly neutral evolution process.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 07:45:19 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Kong",
"Sing-Guan",
""
],
[
"Chen",
"Hong-Da",
""
],
[
"Fan",
"Wen-Lang",
""
],
[
"Wigger",
"Jan",
""
],
[
"Torda",
"Andrew",
""
],
[
"Lee",
"HC",
""
]
] |
0708.1599 | Eyal Neistein | Eyal Neistein and Avishai Dekel | Constructing Merger Trees that Mimic N-Body Simulations | 13 pages, 9 figures. Accepted for MNRAS. Minor changes from version 1 | null | 10.1111/j.1365-2966.2007.12570.x | null | astro-ph | null | We present a simple and efficient empirical algorithm for constructing
dark-matter halo merger trees that reproduce the distribution of trees in the
Millennium cosmological $N$-body simulation. The generated trees are
significantly better than EPS trees. The algorithm is Markovian, and it
therefore fails to reproduce the non-Markov features of trees across short time
steps, except for an accurate fit to the evolution of the average main
progenitor. However, it properly recovers the full main progenitor distribution
and the joint distributions of all the progenitors over long-enough time steps,
$\Delta \omega \simeq \Delta z>0.5$, where $\omega \simeq 1.69/D(t)$ is the
self-similar time variable and $D(t)$ refers to the linear growth of density
fluctuations. We find that the main progenitor distribution is log-normal in
the variable $\sigma^2(M)$, the variance of linear density fluctuations in a
sphere encompassing mass $M$. The secondary progenitors are successfully drawn
one by one from the remaining mass using a similar distribution function. These
empirical findings may be clues to the underlying physics of merger-tree
statistics. As a byproduct, we provide useful, accurate analytic time-invariant
approximations for the main progenitor accretion history and for halo merger
rates.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 17:09:25 GMT"
},
{
"version": "v2",
"created": "Sat, 13 Oct 2007 06:43:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Neistein",
"Eyal",
""
],
[
"Dekel",
"Avishai",
""
]
] |
0708.1600 | Mizuki Sumihama | M. Sumihama, J.K. Ahn, H. Akimune, Y. Asano, W.C. Chang, S. Dat\'e, H.
Ejiri, H. Fujimura, M. Fujiwara, K. Hicks, T. Hotta, K. Imai, T. Ishikawa, T.
Iwata, H. Kawai, Z.Y. Kim, K. Kino, H. Kohri, N. Kumagai, S. Makino, T.
Matsumura, N. Matsuoka, T. Mibe, M. Miyabe, Y. Miyachi, M. Morita, N.
Muramatsu, T. Nakano, M. Niiyama, M. Nomachi, Y. Ohashi, H. Ohkuma, T. Ooba,
D.S. Oshuev, C. Rangacharyulu, A. Sakaguchi, T. Sato, P.M. Shagin, Y. Shiino,
H. Shimizu, Y. Sugaya, H. Toyokawa, A. Wakai, C.W. Wang, S.C. Wang, K.
Yonehara, T. Yorita, M. Yosoi, R.G.T. Zegers | Backward-angle photoproduction of $\pi^0$ mesons on the proton at
$E_\gamma$ = 1.5--2.4 GeV | 12 pages, 4 figures, submitted to PLB | Phys.Lett.B657:32-37,2007 | 10.1016/j.physletb.2007.10.032 | null | nucl-ex | null | Differential cross sections and photon beam asymmetries for $\pi^0$
photoproduction have been measured at $E_\gamma$ = 1.5--2.4 GeV and at the
$\pi^0$ scattering angles, --1 $<$ cos$\Theta_{c.m.} <$ --0.6. The
energy-dependent slope of differential cross sections for $u$-channel $\pi^0$
production has been determined. An enhancement at backward angles is found
above $E_\gamma$ = 2.0 GeV. This is inferred to be due to the $u$-channel
contribution and/or resonances. Photon beam asymmetries have been obtained for
the first time at backward angles. A strong angular dependence has been found
at $E_\gamma >$ 2.0 GeV, which may be due to the unknown high-mass resonances.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 09:08:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sumihama",
"M.",
""
],
[
"Ahn",
"J. K.",
""
],
[
"Akimune",
"H.",
""
],
[
"Asano",
"Y.",
""
],
[
"Chang",
"W. C.",
""
],
[
"Daté",
"S.",
""
],
[
"Ejiri",
"H.",
""
],
[
"Fujimura",
"H.",
""
],
[
"Fujiwara",
"M.",
""
],
[
"Hicks",
"K.",
""
],
[
"Hotta",
"T.",
""
],
[
"Imai",
"K.",
""
],
[
"Ishikawa",
"T.",
""
],
[
"Iwata",
"T.",
""
],
[
"Kawai",
"H.",
""
],
[
"Kim",
"Z. Y.",
""
],
[
"Kino",
"K.",
""
],
[
"Kohri",
"H.",
""
],
[
"Kumagai",
"N.",
""
],
[
"Makino",
"S.",
""
],
[
"Matsumura",
"T.",
""
],
[
"Matsuoka",
"N.",
""
],
[
"Mibe",
"T.",
""
],
[
"Miyabe",
"M.",
""
],
[
"Miyachi",
"Y.",
""
],
[
"Morita",
"M.",
""
],
[
"Muramatsu",
"N.",
""
],
[
"Nakano",
"T.",
""
],
[
"Niiyama",
"M.",
""
],
[
"Nomachi",
"M.",
""
],
[
"Ohashi",
"Y.",
""
],
[
"Ohkuma",
"H.",
""
],
[
"Ooba",
"T.",
""
],
[
"Oshuev",
"D. S.",
""
],
[
"Rangacharyulu",
"C.",
""
],
[
"Sakaguchi",
"A.",
""
],
[
"Sato",
"T.",
""
],
[
"Shagin",
"P. M.",
""
],
[
"Shiino",
"Y.",
""
],
[
"Shimizu",
"H.",
""
],
[
"Sugaya",
"Y.",
""
],
[
"Toyokawa",
"H.",
""
],
[
"Wakai",
"A.",
""
],
[
"Wang",
"C. W.",
""
],
[
"Wang",
"S. C.",
""
],
[
"Yonehara",
"K.",
""
],
[
"Yorita",
"T.",
""
],
[
"Yosoi",
"M.",
""
],
[
"Zegers",
"R. G. T.",
""
]
] |
0708.1601 | Aleksandar Ivic | Aleksandar Ivi\'c | On the mean square of the divisor function in short intervals | 11 pages | J. Th\'eorie des Nombres Bordeaux 21(2009), 195-205 | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide upper bounds for the mean square integral $$
\int_X^{2X}(\Delta_k(x+h) - \Delta_k(x))^2 dx \qquad(h = h(X)\gg1, h = o(x)
{\roman{as}} X\to\infty) $$ where $h$ lies in a suitable range. For $k\ge2$ a
fixed integer, $\Delta_k(x)$ is the error term in the asymptotic formula for
the summatory function of the divisor function $d_k(n)$, generated by
$\zeta^k(s)$.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 08:50:48 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Jan 2009 08:05:51 GMT"
}
] | 2010-01-23T00:00:00 | [
[
"Ivić",
"Aleksandar",
""
]
] |
0708.1602 | Richard J. Furnstahl | S.K. Bogner, R.J. Furnstahl, R.J. Perry | Three-Body Forces Produced by a Similarity Renormalization Group
Transformation in a Simple Model | 25 pages, 18 figures, minor typos corrected and references updated | AnnalsPhys.323:1478-1501,2008 | 10.1016/j.aop.2007.09.001 | null | nucl-th cond-mat.str-el hep-ph | null | A simple class of unitary renormalization group transformations that force
hamiltonians towards a band-diagonal form produce few-body interactions in
which low- and high-energy states are decoupled, which can greatly simplify
many-body calculations. One such transformation has been applied to
phenomenological and effective field theory nucleon-nucleon interactions with
success, but further progress requires consistent treatment of at least the
three-nucleon interaction. In this paper we demonstrate in an extremely simple
model how these renormalization group transformations consistently evolve two-
and three-body interactions towards band-diagonal form, and introduce a
diagrammatic approach that generalizes to the realistic nuclear problem.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 13:12:28 GMT"
},
{
"version": "v2",
"created": "Thu, 25 Oct 2007 21:42:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bogner",
"S. K.",
""
],
[
"Furnstahl",
"R. J.",
""
],
[
"Perry",
"R. J.",
""
]
] |
0708.1603 | Daniel Whalen | Daniel Whalen, Brian W. O'Shea, Joseph Smidt, Michael L. Norman | How the First Stars Regulated Local Star Formation I: Radiative Feedback | 20 pages, 19 figures, accepted by ApJ, title and abstract changed | Astrophys.J.579:925-941,2008 | 10.1086/587731 | LA-UR 07-4743 | astro-ph | null | We present numerical simulations of how a 120 M$_\odot$ primordial star
regulates star formation in nearby cosmological halos at $z \sim$ 20 by
photoevaporation. Our models include nine-species primordial chemistry and
self-consistent multifrequency conservative transfer of UV photons with all
relevant radiative processes. Whether or not new stars form in halos clustered
around a Population III star ultimately depends on their core densities and
proximity to the star. Diffuse halos with central densities below 2 - 3
cm$^{-3}$ are completely ionized and evaporated anywhere in the cluster.
Evolved halos with core densities above 2000 cm$^{-3}$ are impervious to both
ionizing and Lyman-Werner flux at most distances from the star and collapse as
quickly as they would in its absence. Star formation in halos of intermediate
density can be either promoted or suppressed depending on how the I-front
remnant shock compresses, deforms and enriches the core with H$_2$. We find
that the 120 M$_\odot$ star photodissociates H$_2$ in most halos in the cluster
but that catalysis by H- restores it a few hundred kyr after the death of the
star, with little effect on star formation. Our models exhibit significant
departures from previous one-dimensional spherically-symmetric simulations,
which are prone to serious errors due to unphysical geometric focusing effects.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 11:24:48 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Dec 2007 07:44:47 GMT"
},
{
"version": "v3",
"created": "Thu, 14 Feb 2008 15:29:06 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Whalen",
"Daniel",
""
],
[
"O'Shea",
"Brian W.",
""
],
[
"Smidt",
"Joseph",
""
],
[
"Norman",
"Michael L.",
""
]
] |
0708.1604 | Oleg Karpenkov | O. Karpenkov | On determination of periods of geometric continued fractions for
two-dimensional algebraic hyperbolic operators | null | null | null | null | math.NT | null | For a given sequence of positive integers we make an explicit construction of
a reduced hyperbolic operator in SL(2,z) with the sequence as a period of a
geometric continued fraction in the sense of Klein. Further we experimentally
study an algorithm to construct a period for an arbitrary operator of SL(2,z)
(the Gauss Reduction Theory).
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 11:34:17 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Karpenkov",
"O.",
""
]
] |
0708.1605 | Nikolay Tyurin | Nik. Tyurin | On families of $BS_{can}$ lagrangian tori in projective spaces | 4 pages without figas | null | null | null | math.SG | null | This small note contains two simple remarks about Bohr - Sommerfeld with
respect to the anticanonical class lagrangian tori in the projective spaces,
which are the most popular examples of monotone symplectic manifolds.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 11:42:23 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Tyurin",
"Nik.",
""
]
] |
0708.1606 | Mika Juvela | M. Juvela (1), V.-M.Pelkonen (1), P. Padoan (2), K. Mattila (1) ((1)
Helsinki University Observatory, (2) Department of Physics, UCSD) | A Corona Australis cloud filament seen in NIR scattered light I.
Comparison with extinction of background stars | 14 pages, 15 figures, accepted to A&A, the version includes small
changes in the text and an added appendix | null | 10.1051/0004-6361:20078470 | null | astro-ph | null | With current near-infrared (NIR) instruments the near-infrared light
scattered from interstellar clouds can be mapped over large areas. The surface
brightness carries information on the line-of-sight dust column density.
Therefore, scattered light could provide an important tool to study mass
distribution in quiescent interstellar clouds at a high, even sub-arcsecond
resolution. We wish to confirm the assumption that light scattering dominates
the surface brightness in all NIR bands. Furthermore, we want to show that
scattered light can be used for an accurate estimation of dust column densities
in clouds with Av in the range 1-15mag. We have obtained NIR images of a
quiescent filament in the Corona Australis molecular cloud. The observations
provide maps of diffuse surface brightness in J, H, and Ks bands. Using the
assumption that signal is caused by scattered light we convert surface
brightness data into a map of dust column density. The same observations
provide colour excesses for a large number of background stars. These data are
used to derive an extinction map of the cloud. The two, largely independent
tracers of the cloud structure are compared. Results. In regions below Av=15m
both diffuse surface brightness and background stars lead to similar column
density estimates. The existing differences can be explained as a result of
normal observational errors and bias in the sampling of extinctions provided by
the background stars. There is no indication that thermal dust emission would
have a significant contribution even in the Ks band. The results show that,
below Av=15mag, scattered light does provide a reliable way to map cloud
structure. Compared with the use of background stars it can also in practice
provide a significantly higher spatial resolution.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 12:01:37 GMT"
},
{
"version": "v2",
"created": "Wed, 9 Jan 2008 07:27:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Juvela",
"M.",
""
],
[
"Pelkonen",
"V. -M.",
""
],
[
"Padoan",
"P.",
""
],
[
"Mattila",
"K.",
""
]
] |
0708.1607 | Elisabetta Caffau | Elisabetta Caffau (GEPI), Matthias Steffen (AIP), Luca Sbordone (GEPI,
CIFIST), Hans-G. Ludwig (GEPI, CIFIST), Piercarlo Bonifacio (GEPI, CIFIST,
INAF-OAT) | The solar photospheric abundance of phosphorus: results from co5bold 3D
model atmospheres | null | null | 10.1051/0004-6361:20078370 | null | astro-ph | null | aims: We determine the solar abundance of phosphorus using co5bold 3D
hydrodynamic model atmospheres. method: High resolution, high signal-to-noise
solar spectra of the PI lines of Multiplet 1 at 1051-1068 nm are compared to
line formation computations performed on a co5bold solar model atmosphere.
results: We find A(P)=5.46+- 0.04, in good agreement with previous analysis
based on 1D model atmospheres, due to the fact that the PI lines of Mult. 1 are
little affected by 3D effects. We cannot confirm an earlier claim by other
authors of a downward revision of the solar P abundance by 0.1 dex employing a
3D model atmosphere. Concerning other stars, we found modest (<0.1 dex) 3D
abundance corrections for P among four F dwarf model atmospheres of different
metallicity, being largest at lowest metallicity. conclusions: We conclude that
3D abundance corrections are generally rather small for the PI lines studied in
this work. They are marginally relevant for metal-poor stars, but may be
neglected in the Sun.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 12:24:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Caffau",
"Elisabetta",
"",
"GEPI"
],
[
"Steffen",
"Matthias",
"",
"AIP"
],
[
"Sbordone",
"Luca",
"",
"GEPI,\n CIFIST"
],
[
"Ludwig",
"Hans-G.",
"",
"GEPI, CIFIST"
],
[
"Bonifacio",
"Piercarlo",
"",
"GEPI, CIFIST,\n INAF-OAT"
]
] |
0708.1608 | Uri Onn | Nir Avni, Uri Onn, Amritanshu Prasad and Leonid Vaserstein | Similarity classes of 3x3 matrices over a local principal ideal ring | 14 pages, final version, to appear in Communications in Algebra | Communications in Algebra, volume 37, no. 8, pages 2601-2615,
August 2009 | 10.1080/00927870902747266 | null | math.GR math.RA | null | In this paper similarity classes of three by three matrices over a local
principal ideal commutative ring are analyzed. When the residue field is
finite, a generating function for the number of similarity classes for all
finite quotients of the ring is computed explicitly.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 12:40:54 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 11:28:20 GMT"
}
] | 2010-06-15T00:00:00 | [
[
"Avni",
"Nir",
""
],
[
"Onn",
"Uri",
""
],
[
"Prasad",
"Amritanshu",
""
],
[
"Vaserstein",
"Leonid",
""
]
] |
0708.1609 | Grzegorz Wilk | Z. Wlodarczyk and G. Wilk | Cosmic rays from thermal sources | Enlarged version combining material presented by Z.Wlodarczyk at the
XXX ICRC, 3-11 July 2007, Merida, Yucatan, Mexico, and by G.Wilk at the VIth
Int. Workshop "New Worlds in Astrop. Physics, 6-8 September 2007, Faro,
Portugal; new material added | null | null | XXX ICRC, 3-11 July 2007, Merida, Yucatan, Mexico | astro-ph hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Energy spectrum of cosmic rays (CR) exhibits power-like behavior with very
characteristic "knee" structure. We consider a generalized statistical model
for the production process of cosmic rays which accounts for such behavior in a
natural way either by assuming existence of temperature fluctuations in the
source of CR, or by assuming specific temperature distribution of CR sources.
Both possibilities yield the so called Tsallis statistics and lead to the
power-like distribution. We argue that the "knee" structure arises as result of
abrupt change of fluctuations in the source of CR. Its possible origin is
briefly discussed.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 13:32:31 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Oct 2007 14:47:00 GMT"
},
{
"version": "v3",
"created": "Wed, 29 Oct 2008 12:46:52 GMT"
}
] | 2011-11-28T00:00:00 | [
[
"Wlodarczyk",
"Z.",
""
],
[
"Wilk",
"G.",
""
]
] |
0708.1610 | Moty Schultz | Moty Schultz and Lior Klein | Relaxation of transport properties in electron doped SrTiO3 | null | null | 10.1063/1.2795336 | null | cond-mat.other | null | We electron-dope single crystal samples of SrTiO_3 by exposing them to Ar^+
irradiation and observe carrier mobility similar in its magnitude and
temperature dependence to the carrier mobility in other electron-doped SrTiO3
systems. We find that some transport properties are time-dependent. In
particular, the sheet resistance increases with time at a temperature-dependent
rate, suggesting an activation barrier on the order of 1 eV. We attribute the
relaxation effects to diffusion of oxygen vacancies - a process with energy
barrier similar to the observed activation energy.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 13:55:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schultz",
"Moty",
""
],
[
"Klein",
"Lior",
""
]
] |
0708.1611 | Kourosh Nozari | Kourosh Nozari | DGP Cosmology with a Non-Minimally Coupled Scalar Field on the Brane | 26 pages, 3 eps figures | JCAP 0709:003,2007 | 10.1088/1475-7516/2007/09/003 | null | hep-th | null | We construct a DGP inspired braneworld scenario where a scalar field
non-minimally coupled to the induced Ricci curvature is present on the brane.
First we investigate the status of gravitational potential with non-minimal
coupling and observational constraints on this non-minimal model. Then we
further deepen the idea of embedding of FRW cosmology in this non-minimal
setup. Cosmological implications of this scenario are examined with details and
the quintessence and late-time expansion of the universe within this framework
are examined. Some observational constraints imposed on this non-minimal
scenario are studied and relation of this model with dark radiation formalism
is determined with details.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 13:56:25 GMT"
}
] | 2009-06-11T00:00:00 | [
[
"Nozari",
"Kourosh",
""
]
] |
0708.1612 | Yu Feng Zhou | Cheng-Wei Chiang and Yu-Feng Zhou | Flavor SU(3) analysis of charmless B->PP decays | 3 pages, 2 figs. Talk given at EPS-HEP07 To appear in the
proceedings, Reference added | J.Phys.Conf.Ser.110:052056,2008 | 10.1088/1742-6596/110/5/052056 | null | hep-ph | null | We perform a global fits to charmless $B \to PP$ decays which independently
constrain the $(\bar\rho,\bar\eta)$ vertex of the unitarity triangle. The
fitted amplitudes and phase are used to predict the branching ratios and CP
asymmetries of all decay modes, including those of the $B_s$ system. Different
schemes of SU(3) breaking in decay amplitude sizes are analyzed. The
possibility of having a new physics contribution to $K \pi$ decays is also
discussed.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 14:02:05 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Aug 2007 10:24:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chiang",
"Cheng-Wei",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] |
0708.1613 | Victor Tsukanov | V. D. Tsukanov | Simplified Version of the Nucleon and Delta-Isobar Description | 5 pages, LaTeX | null | null | null | nucl-th | null | Considering synchronous spin-isospin rotation as a collective motion a
simplified scheme of the nucleon and delta isobar description is formulated.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 16:05:48 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Tsukanov",
"V. D.",
""
]
] |
0708.1614 | Joseph Tuggle | The BABAR Collaboration: B. Aubert, et al | Measurement of The Time-Dependent CP Asymmetry in B0 --> K*0 gamma
Decays | 14 pages, 3 figures, contributed to LP07 | null | null | BABAR-CONF-07/005, SLAC-PUB-12732 | hep-ex | null | We present a preliminary measurement of the time-dependent CP asymmetry in B0
--> K*0 (K_S0 pi0) gamma decays based on 431 x 10^6 Upsilon(4S) --> BBbar
decays collected with the BaBar detector at the PEP-II asymmetric-energy e+e-
collider at SLAC. In a sample containing 316 +/- 22 signal events we measure
S_{K* gamma} = -0.08 +/- 0.31 +/- 0.05 and C_{K* gamma} = -0.15 +/- 0.17 +/-
0.03. The uncertainties are statistical and systematic, respectively.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 16:23:18 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"The BABAR Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0708.1615 | Shimon Rubin | S. Rubin, J. Feinberg, A. Mann, M. Revzen | Classical limit of the Casimir entropy for scalar massless field | 14 pages | PhysicaA384:335-345,2007 | 10.1016/j.physa.2007.06.026 | null | quant-ph | null | We study the Casimir effect at finite temperature for a massless scalar field
in the parallel plates geometry in N spatial dimensions, under various
combinations of Dirichlet and Neumann boundary conditions on the plates. We
show that in all these cases the entropy, in the limit where energy
equipartitioning applies, is a geometrical factor whose sign determines the
sign of the Casimir force.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 16:42:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Rubin",
"S.",
""
],
[
"Feinberg",
"J.",
""
],
[
"Mann",
"A.",
""
],
[
"Revzen",
"M.",
""
]
] |
0708.1616 | Sumiyoshi Abe | Sumiyoshi Abe (1,2) and Stefan Thurner (3,4) ((1) Mie University,
Japan, (2) Institut Superieur des Materiaux et Mecaniques Avances, Le Mans,
France, (3) Medical University of Vienna, Austria, (4) Santa Fe Inst, USA) | Robustness of the second law of thermodynamics under generalizations of
the maximum entropy method | 9 pages, no figures | null | 10.1209/0295-5075/81/10004 | null | cond-mat.stat-mech | null | It is shown that the laws of thermodynamics are extremely robust under
generalizations of the form of entropy. Using the Bregman-type relative
entropy, the Clausius inequality is proved to be always valid. This implies
that thermodynamics is highly universal and does not rule out consistent
generalization of the maximum entropy method.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 16:31:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Abe",
"Sumiyoshi",
""
],
[
"Thurner",
"Stefan",
""
]
] |
0708.1617 | Glennys R. Farrar | Glennys R. Farrar | Evidence that a cluster of UHECRs was produced by a burst or flare | Talk at the ICRC07, 4 pp | null | null | null | astro-ph | null | The angular clustering of 5 Ultrahigh Energy Cosmic Rays (UHECRs) in the
combined published AGASA-HiRes data has a probability of ~ 2 10^-3 of occurring
by chance. A first analysis of the implications of the event energies and
angular spreading is presented, which is applicable if the source is close
enough that GZK losses can be ignored. Under this assumption, the observed
energies of the events in this cluster favor a bursting rather than
continuously emitting source, with the events emitted on a time scale short
compared with 300 D_Mpc years. Assuming the UHECRs experience many incoherent
small magnetic deflections enroute from source to Earth, the arrival direction
distribution allows estimation that < B^2 lambda > D ~ 7.7 nG^2 Mpc^2, where
lambda is the coherence length of the field and D is the source distance. If
the spectrum at the source ~ E^{-2}, the total isotropic equivalent energy
emitted in UHECRs is > 10^43 D_Mpc^3 ergs.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 17:38:34 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Farrar",
"Glennys R.",
""
]
] |
0708.1618 | Efrain J. Ferrer | Efrain J. Ferrer | Gluon Vortices and Induced Magnetic Field in Compact Stars | To appear in the Proceedings of the VII Latin American Symposium on
Nuclear Physics and Applications. Cusco (Peru) June 2007 | AIPConf.Proc.947:401-406,2007 | 10.1063/1.2813841 | null | astro-ph hep-ph nucl-th | null | The natural candidates for the realization of color superconductivity are the
extremely dense cores of compact stars, many of which have very large magnetic
fields, especially the so-called magnetars. In this paper we discuss how a
color superconducting core can serve to generate and enhance the stellar
magnetic field without appealing to a magnetohydrodynamic dynamo mechanism.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 17:31:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ferrer",
"Efrain J.",
""
]
] |
0708.1619 | Vivian de la Incera | Vivian de la Incera | Magnetic Phases in Dense Quark Matter | Presented at VII Latin American Symposium on Nuclear Physics and
Applications, El Cusco, Peru, June 2007 | AIPConf.Proc.947:395-400,2007 | 10.1063/1.2813838 | null | nucl-th astro-ph hep-ph | null | In this paper I discuss the magnetic phases of the three-flavor color
superconductor. These phases can take place at different field strengths in a
highly dense quark system. Given that the best natural candidates for the
realization of color superconductivity are the extremely dense cores of neutron
stars, which typically have very large magnetic fields, the magnetic phases
here discussed could have implications for the physics of these compact
objects.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 18:14:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"de la Incera",
"Vivian",
""
]
] |
0708.1620 | Vladimir Bavula | V. V. Bavula | The group of automorphisms of the first Weyl algebra in prime
characteristic and the restriction map | 12 pages | null | null | null | math.RA math.AG | null | Let $K$ be a {\em perfect} field of characteristic $p>0$, $A_1:=K< x, \der |
\der x- x\der =1>$ be the first Weyl algebra and $Z:=K[X:=x^p, Y:=\der^p]$ be
its centre. It is proved that $(i)$ the restriction map $\res :\Aut_K(A_1)\ra
\Aut_K(Z), \s \mapsto \s|_Z$, is a monomorphism with $\im (\res) = \G :=\{\tau
\in \Aut_K(Z) | \CJ (\tau) =1\}$ where $\CJ (\tau) $ is the Jacobian of $\tau$
(note that $\Aut_K(Z)=K^*\ltimes \G$ and if $K$ is {\em not} perfect then $\im
(\res) \neq \G$); $(ii)$ the bijection $\res : \Aut_K(A_1) \ra \G$ is a
monomorphism of infinite dimensional algebraic groups which is {\em not} an
isomorphism (even if $K$ is algebraically closed); $(iii)$ an explicit formula
for $\res^{-1}$ is found via differential operators $\CD (Z)$ on $Z$ and
negative powers of the Fronenius map $F$. Proofs are based on the following
(non-obvious) equality proved in the paper: $$ (\frac{d}{dx}+f)^p=
(\frac{d}{dx})^p+\frac{d^{p-1}f}{dx^{p-1}}+f^p, f\in K[x].$$
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 18:07:53 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Bavula",
"V. V.",
""
]
] |
0708.1621 | Ikaros Bigi | I. I. Bigi, B. Blossier, A. Le Yaouanc, L. Oliver, O. P\`ene, J.-C.
Raynal, A. Oyanguren, P. Roudeau | Memorino on the `1/2 vs. 3/2 Puzzle' in $\bar B \to l \bar \nu X_c$ -- a
Year Later and a Bit Wiser | 21 pages, no figures; corrected address of one of the authors and
included new measurements by BaBar | Eur.Phys.J.C52:975-985,2007 | 10.1140/epjc/s10052-007-0425-1 | UND-HEP-07-BIG05, DESY 07-116, SFB/CPP-07-45, LPT-ORSAY 07-67, LAL
07-109 | hep-ph | null | The OPE treatment that has been so successful in describing inclusive $\bar B
\to l \bar \nu X_c$ decays yields sum rules (in particular the Uraltsev sum
rule and its higher moments) implying the dominance of the $P$ wave $j_q = 3/2$
charm states in $X_c$ over their $j_q=1/2$ counterparts. This prediction is
supported by other general arguments as well as quark model calculations, which
illustrate the OPE results, and by preliminary lattice findings. Its failure
would indicate a significant limitation in our theoretical understanding of
$\bar B \to l \bar \nu X_c$. Some experimental issues have been clarified since
a preliminary version of this note had appeared, yet the verdict on the
composition of the final states {\em beyond} $D$, $D^*$ and the two narrow $j_q
= 3/2$ resonances remains unsettled. Establishing which hadronic configurations
-- $D/D^* + \pi, D/D^* + 2 \pi, ...$ -- contribute, what their quantum numbers
are and their mass distributions will require considerable experimental effort.
We explain the theoretical issues involved and why a better understanding of
them will be of significant value. Having significant contributions from a mass
continuum distribution below 2.5 GeV raises serious theoretical questions for
which we have no good answer. Two lists are given, one with measurements that
need to be done and one with items of theoretical homework. Some of the latter
can be done by employing existing theoretical tools, whereas others need new
ideas.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 19:26:29 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 00:31:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bigi",
"I. I.",
""
],
[
"Blossier",
"B.",
""
],
[
"Yaouanc",
"A. Le",
""
],
[
"Oliver",
"L.",
""
],
[
"Pène",
"O.",
""
],
[
"Raynal",
"J. -C.",
""
],
[
"Oyanguren",
"A.",
""
],
[
"Roudeau",
"P.",
""
]
] |
0708.1622 | Grigory Garkusha | Grigory Garkusha | Classifying finite localizations of quasi-coherent sheaves | null | null | null | null | math.AG math.KT | null | Given a quasi-compact, quasi-separated scheme X, a bijection between the
tensor localizing subcategories of finite type in Qcoh(X) and the set of all
subsets $Y\subseteq X$ of the form $Y=\bigcup_{i\in\Omega}Y_i$, with
$X\setminus Y_i$ quasi-compact and open for all $i\in\Omega$, is established.
As an application, there is constructed an isomorphism of ringed spaces
(X,O_X)-->(Spec(Qcoh(X)),O_{Qcoh(X)}), where $(Spec(Qcoh(X)),O_{Qcoh(X)})$ is a
ringed space associated to the lattice of tensor localizing subcategories of
finite type. Also, a bijective correspondence between the tensor thick
subcategories of perfect complexes $\perf(X)$ and the tensor localizing
subcategories of finite type in Qcoh(X) is established.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 19:31:48 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Garkusha",
"Grigory",
""
]
] |
0708.1623 | Dmitry Solenov | Dmitry Solenov | Unbalanced Renormalization of Tunneling in MOSFET-type Structures in
Strong High-Frequency Electric Fields | 9 pages, 4 figures | Phys. Rev. B 76, 115309 (2007) | 10.1103/PhysRevB.76.115309 | null | cond-mat.mes-hall quant-ph | null | Two-dimensional electron gas coupled to adjacent impurity sites in
high-frequency out-of-plane ac control electric field is investigated.
Modification of tunneling rates as a function of the field amplitude is
calculated. Nonlinear dependence on the ac field strength is reported for the
conductivity of two-dimensional electron gas. It develops a periodic peak
structure.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 20:12:24 GMT"
}
] | 2007-09-16T00:00:00 | [
[
"Solenov",
"Dmitry",
""
]
] |
0708.1624 | Vita Hinze-Hoare | V. Hinze-Hoare | Designing a Collaborative Research Environment for Students and their
Supervisors (CRESS) | null | null | null | null | cs.HC | null | In a previous paper the CSCR domain was defined. Here this is taken to the
next stage where the design of a particular Collaborative Research Environment
to support Students and Supervisors (CRESS) is considered. Following the CSCR
structure this paper deals with an analysis of 13 collaborative working
environments to determine a preliminary design for CRESS in order to discover
the most appropriate set of tools for its implementation.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 19:58:37 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Hinze-Hoare",
"V.",
""
]
] |
0708.1625 | Andrei Mironov | A. Mironov, A. Morozov and T. N. Tomaras | On n-point Amplitudes in N=4 SYM | minor cosmetic changes, references added in the introduction | JHEP 0711:021,2007 | 10.1088/1126-6708/2007/11/021 | null | hep-th | null | The computation of n-point planar amplitudes in N=4 SYM at strong coupling is
known to be reduced to the search for solutions of the integrable 2d SO(4,2)
sigma-model with growing asymptotics on the world-sheet and to the study of
their Whitham deformations induced by an epsilon-regularization, which breaks
both integrability and SO(4,2) symmetry. A multi-parameter (moduli) family of
such solutions is constructed for n=4. They all correspond to the same s and t
and some are related by SO(4,2) transformations. Nevertheless, they lead to
different regularized areas, whose minimum is the Alday-Maldacena solution. A
brief review of results on n-point amplitudes is also provided, with special
emphasis on the underlying equivalence of the above regularized minimal area in
AdS and a double contour integral along the same boundary, two purely geometric
quantities.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 15:21:59 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Aug 2007 07:21:34 GMT"
}
] | 2009-06-11T00:00:00 | [
[
"Mironov",
"A.",
""
],
[
"Morozov",
"A.",
""
],
[
"Tomaras",
"T. N.",
""
]
] |
0708.1626 | David Sands Dr | David Sands | Thermodynamic Entropy And The Accessible States of Some Simple Systems | 9 pages, 1 figure | null | 10.1088/0143-0807/29/1/013 | null | physics.gen-ph | null | Comparison of the thermodynamic entropy with Boltzmann's principle shows that
under conditions of constant volume the total number of arrangements in simple
thermodynamic systems with temperature-independent heat capacities is TC/k. A
physical interpretation of this function is given for three such systems; an
ideal monatomic gas, an ideal gas of diatomic molecules with rotational motion,
and a solid in the Dulong-Petit limit of high temperature. T1/2 emerges as a
natural measure of the number of accessible states for a single particle in one
dimension. Extension to N particles in three dimensions leads to TC/k as the
total number of possible arrangements or microstates. The different microstates
of the system are thus shown a posteriori to be equally probable, with
probability T-C/k, which implies that for the purposes of counting states the
particles of the gas are distinguishable. The most probable energy state of the
system is determined by the degeneracy of the microstates.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 20:46:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sands",
"David",
""
]
] |
0708.1627 | Ivan Fernandez-Val | Victor Chernozhukov, Ivan Fernandez-Val, Alfred Galichon | Rearranging Edgeworth-Cornish-Fisher Expansions | 17 pages, 3 figures | Economic Theory February 2010, Volume 42, Issue 2, pp 419-435 | 10.1007/s00199-008-0431-z | null | stat.ME econ.EM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper applies a regularization procedure called increasing rearrangement
to monotonize Edgeworth and Cornish-Fisher expansions and any other related
approximations of distribution and quantile functions of sample statistics.
Besides satisfying the logical monotonicity, required of distribution and
quantile functions, the procedure often delivers strikingly better
approximations to the distribution and quantile functions of the sample mean
than the original Edgeworth-Cornish-Fisher expansions.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 22:11:35 GMT"
},
{
"version": "v2",
"created": "Fri, 31 May 2013 02:23:22 GMT"
}
] | 2017-11-23T00:00:00 | [
[
"Chernozhukov",
"Victor",
""
],
[
"Fernandez-Val",
"Ivan",
""
],
[
"Galichon",
"Alfred",
""
]
] |
0708.1628 | Sebastian Michalski | Sebastian Michalski | Blocks adjustment -- reduction of bias and variance of detrended
fluctuation analysis using Monte Carlo simulation | 20 pages, 14 figures, accepted for publication in Physica A: August
9, 2007 | null | 10.1016/j.physa.2007.08.018 | null | cond-mat.stat-mech | null | The length of minimal and maximal blocks equally distant on log-log scale
versus fluctuation function considerably influences bias and variance of DFA.
Through a number of extensive Monte Carlo simulations and different fractional
Brownian motion/fractional Gaussian noise generators, we found the pair of
minimal and maximal blocks that minimizes the sum of mean-squared error of
estimated Hurst exponents for the series of length N=2^p, p=7,...,15.
Sensitivity of DFA to sort-range correlations was examined using ARFIMA(p,d,q)
generator. Due to the bias of the estimator for anti-persistent processes, we
narrowed down the range of Hurst exponent to 1/2<=H< 1.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 20:53:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Michalski",
"Sebastian",
""
]
] |
0708.1629 | Kieran O'Brien | Kieran O'Brien | Fast spectroscopy and imaging with the FORS2 HIT mode | 19 pages, 7 figures, to appear in "High Time Resolution Astrophysics,
Galway 2006" | null | 10.1007/978-1-4020-6518-7_10 | null | astro-ph | null | The HIgh-Time resolution (HIT) mode of FORS2 has 3 sub-modes that allow for
imaging and spectroscopy over a range of timescales from milliseconds up to
seconds. It is the only high time resolution spectroscopy mode available on an
8m class telescope. In imaging mode, it can be used to measure the pulse of
pulsars and spinning white dwarfs in a variety of high throughput broad- and
narrow-band filters. In spectroscopy mode it can take up to 10 spectra per
second using a novel ''shift-and-wait'' clocking pattern for the CCD. It takes
advantage of the user-designed masks which can be inserted into FORS2 to allow
any two targets within the 6.8' x 6.8' field of view of FORS2 to be selected. A
number of integration, or more precisely 'wait', times are available, which
together with the high throughput GRISMs can observe the entire optical
spectrum on a range of timescales.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 20:59:46 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"O'Brien",
"Kieran",
""
]
] |
0708.1630 | Yury G. Kolomensky | The BABAR Collaboration: B. Aubert, et al | Time-Dependent Analysis of the Decay B0 --> rho0 rho0 | 20 pages, 18 postscript figures, submitted to LP2007. Second version
corrects submission date | null | null | BABAR-CONF-07/012, SLAC-PUB-12734 | hep-ex | null | We study the decay B0 --> rho0 rho0 in a sample of about 427 million
Upsilon(4S) --> BBbar decays collected with the BABAR detector at the PEP-II
asymmetric-energy e+e- collider at SLAC. We find the branching fraction
B = (0.84 +/- 0.29 +/- 0.17)*1e-6 and longitudinal polarization fraction of
f_L = 0.70 +/- 0.14 +/- 0.05, where the first uncertainty is statistical, and
the second is systematic. The evidence for the B0 --> rho0 rho0 signal has 3.6
sigma significance. We investigate the proper-time dependence of the
longitudinal component in the decay and measure the CP-violating coefficients
S^{00}_L = 0.5 +/- 0.9 +/- 0.2 and C^{00}_L = 0.4 +/- 0.9 +/- 0.2,
corresponding to the sine and cosine terms in the time evolution of asymmetry.
We study the implication of these results for penguin contributions in B -->
rho rho decays and for the CKM unitarity angle alpha.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 21:09:23 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 19:16:47 GMT"
}
] | 2007-08-22T00:00:00 | [
[
"The BABAR Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0708.1631 | Jean-S\'ebastien Gagnon | J.-S. Gagnon, S. Jeon | Leading Order Calculation of Shear Viscosity in Hot Quantum
Electrodynamics from Diagrammatic Methods | 45 pages, 22 figures (note that figures 7 and 14 are downgraded in
resolution to keep this submission under 1000kb, zoom to see them correctly) | Phys.Rev.D76:105019,2007 | 10.1103/PhysRevD.76.105019 | null | hep-ph nucl-th | null | We compute the shear viscosity at leading order in hot Quantum
Electrodynamics. Starting from the Kubo relation for shear viscosity, we use
diagrammatic methods to write down the appropriate integral equations for
bosonic and fermionic effective vertices. We also show how Ward identities can
be used to put constraints on these integral equations. One of our main results
is an equation relating the kernels of the integral equations with functional
derivatives of the full self-energy; it is similar to what is obtained with
two-particle-irreducible effective action methods. However, since we use Ward
identities as our starting point, gauge invariance is preserved. Using these
constraints obtained from Ward identities and also power counting arguments, we
select the necessary diagrams that must be resummed at leading order. This
includes all non-collinear (corresponding to 2 to 2 scatterings) and collinear
(corresponding to 1+N to 2+N collinear scatterings) rungs responsible for the
Landau-Pomeranchuk-Migdal effect. We also show the equivalence between our
integral equations obtained from quantum field theory and the linearized
Boltzmann equations of Arnold, Moore and Yaffe obtained using effective kinetic
theory.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 22:23:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gagnon",
"J. -S.",
""
],
[
"Jeon",
"S.",
""
]
] |
0708.1632 | Chiu Fan Lee | Chiu Fan Lee | Mechanical properties of the two-filament insulin amyloid fibril: a
theoretical study | null | null | null | null | cond-mat.soft cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the two-filament insulin fibril's structure by incorporating recent
simulation results and mechanical measurements. Our investigation suggests that
the persistence length measurement correlates well with the previously proposed
structural model, while the elasticity measurement suggests that stretching the
fibril may involve hydrogen bond breakage. Our work illustrates an attempt to
correlate nanoscale measurements with microscopic information on the quaternary
protein structure.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 21:48:38 GMT"
},
{
"version": "v2",
"created": "Sun, 3 Aug 2008 03:16:35 GMT"
}
] | 2008-08-03T00:00:00 | [
[
"Lee",
"Chiu Fan",
""
]
] |
0708.1633 | Huey-Wen Lin | Huey-Wen Lin | Charmed spectroscopy from a nonperturbatively determined relativistic
heavy quark action in full QCD | Proceeding for 24th International Symposium on Lattice Field Theory
(Lattice 2006), Tucson, Arizona, 23-28 Jul 2006 | PoS LAT:184,2006 | null | null | hep-lat | null | We present a preliminary calculation of the charmed meson spectrum using the
2+1 flavor domain wall fermion lattice configurations currently being generated
by the RBC and UKQCD collaborations. The calculation is performed using the
3-parameter, relativistic heavy quark action with nonperturbatively determined
coefficients. We will also demonstrate a step-scaling procedure for determining
these coefficients nonperturbatively using a series of quenched, gauge field
ensembles generated for three different lattice spacings.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 22:13:57 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Lin",
"Huey-Wen",
""
]
] |
0708.1634 | Boris Shoikhet | Boris Shoikhet | Kontsevich formality and PBW algebras | 17 pages LaTeX | null | null | null | math.KT math.RA | null | This paper is based on the author's paper "Koszul duality in deformation
quantization, I", with some improvements. In particular, an Introduction is
added, and the convergence of the spectral sequence in Lemma 2.1 is rigorously
proven. Some informal discussion in Section 1.5 is added.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 23:02:18 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Aug 2007 21:25:54 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Shoikhet",
"Boris",
""
]
] |
0708.1635 | D. Bar | D. Bar | Gravitational brainwaves, quantum fluctuations and stochastic
quantization | 54 pages, 1 PS figure | null | null | null | gr-qc | null | It is known that the biological activity of the brain involves radiation of
electric waves. These waves result from ionic currents and charges traveling
among the brain's neurons. But it is obvious that these ions and charges are
carried by their relevant masses which should give rise, according to the
gravitational theory, to extremely weak gravitational waves.
We use in the following the stochastic quantization (SQ) theory to calculate
the probability to find a large ensemble of brains radiating similar
gravitational waves. We also use this SQ theory to derive the equilibrium state
related to the known Lamb shift.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 17:45:28 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Bar",
"D.",
""
]
] |
0708.1636 | Stephen Curran Dr | S. J. Curran, J. Darling, A. D. Bolatto, M. T. Whiting, C. Bignell, J.
K. Webb | HI and OH absorption in the lensing galaxy of MG J0414+0534 | Accepted by MNRAS Letters, 5 (and a bit) pages, 5 figures | null | 10.1111/j.1745-3933.2007.00379.x | null | astro-ph | null | We report the detection of \HI 21-cm absorption in the $z=0.96$ early-type
lensing galaxy towards MG J0414+0534 with the Green Bank Telescope. The
absorption, with total $N_{\rm HI}=1.6 \times 10^{18} (T_{\rm s}/f) {\rm
cm}^{-2}$, is resolved into two strong components, probably due to the two
strongest lens components, which are separated by 0.4\arcsec. Unlike the other
three lenses which have been detected in \HI, J0414+0534 does not exhibit
strong OH absorption, giving a OH/\HI column density ratio of $N_{\rm
OH}/N_{\rm HI}\lapp10^{-6}$ (for $T_{\rm s}=100$ K, $T_{\rm x}=10$ K and
$f_{\rm HI}=f_{\rm OH}=1$). This underabundance of molecular gas may indicate
that the extreme optical--near-IR colour ($V-K=10.26$) along the line-of-sight
is not due to the lens. We therefore suggest that despite the strong upper
limits on molecular absorption at the quasar redshift, as traced by millimetre
lines, the extinction occurs primarily in the quasar host galaxy.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 00:43:30 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Sep 2007 06:15:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Curran",
"S. J.",
""
],
[
"Darling",
"J.",
""
],
[
"Bolatto",
"A. D.",
""
],
[
"Whiting",
"M. T.",
""
],
[
"Bignell",
"C.",
""
],
[
"Webb",
"J. K.",
""
]
] |
0708.1637 | Thimo Rohlf | Thimo Rohlf | Self-organization of heterogeneous topology and symmetry breaking in
networks with adaptive thresholds and rewiring | 4 pages revtex, 6 figures | null | 10.1209/0295-5075/84/10004 | null | cond-mat.dis-nn cond-mat.stat-mech nlin.AO q-bio.MN | null | We study an evolutionary algorithm that locally adapts thresholds and wiring
in Random Threshold Networks, based on measurements of a dynamical order
parameter. A control parameter $p$ determines the probability of threshold
adaptations vs. link rewiring. For any $p < 1$, we find spontaneous symmetry
breaking into a new class of self-organized networks, characterized by a much
higher average connectivity $\bar{K}_{evo}$ than networks without threshold
adaptation ($p =1$). While $\bar{K}_{evo}$ and evolved out-degree distributions
are independent from $p$ for $p <1$, in-degree distributions become broader
when $p \to 1$, approaching a power-law. In this limit, time scale separation
between threshold adaptions and rewiring also leads to strong correlations
between thresholds and in-degree. Finally, evidence is presented that networks
converge to self-organized criticality for large $N$.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 02:17:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rohlf",
"Thimo",
""
]
] |
0708.1638 | Akhlesh Lakhtakia | Mukul Dixit, Akhlesh Lakhtakia | Electrically controlled Bragg resonances of an ambichiral electro-optic
structure: oblique incidence | 11 pages | null | 10.1117/12.726939 | null | physics.optics | null | The Pockels effect can increase the effective birefringence of ambichiral,
electro--optic rejection filters made of materials with a $\bar{4}2m$ point
group symmetry, when a dc electric field is applied parallel to the axis of
nonhomogeneity. The reflectances and the transmittances of such an ambichiral
structure for obliquely incident plane waves is solvable through a
boundary-value problem that is formulated using the frequency-domain Maxwell
equations, the constitutive equations that contain the Pockels effect, and
standard algebraic techniques for handling 4x4 matrix ordinary differential
equations. The Bragg resonance peaks, for different
circular-polarized-incidence conditions, blueshift as the angle of incidence
increases. These blueshifts are unaffected by the sign of the dc electric
field.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 01:52:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dixit",
"Mukul",
""
],
[
"Lakhtakia",
"Akhlesh",
""
]
] |
0708.1639 | Sung-Sik Lee | Sung-Sik Lee and Shinsei Ryu | Many-body generalization of the Z2 topological invariant for the quantum
spin Hall effect | 4 pages, 3 figures (final version to appear in Phys. Rev. Lett.) | Phys. Rev. Lett. 100, 186807 (2008) | 10.1103/PhysRevLett.100.186807 | null | cond-mat.mes-hall | null | We propose a many-body generalization of the Z2 topological invariant for the
quantum spin Hall insulator, which does not rely on single-particle band
structures. The invariant is derived as a topological obstruction that
distinguishes topologically distinct many-body ground states on a torus. It is
also expressed as a Wilson-loop of the SU(2) Berry gauge field, which is
quantized due to the time-reversal symmetry.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 02:12:08 GMT"
},
{
"version": "v2",
"created": "Fri, 2 May 2008 18:18:26 GMT"
}
] | 2008-05-07T00:00:00 | [
[
"Lee",
"Sung-Sik",
""
],
[
"Ryu",
"Shinsei",
""
]
] |
0708.1640 | Shigeki Fujiyama Dr. | Shigeki Fujiyama, A. Shitade, K. Kanoda, Y. Kosaka, H. M. Yamamoto,
and R. Kato | Suppression of electronic susceptibility in metal-Mott insulator
alternating material, (Me-3,5-DIP)[Ni(dmit)2]2 | null | null | 10.1103/PhysRevB.77.060403 | null | cond-mat.str-el | null | Frequency shifts and nuclear relaxations of 13C NMR of the metal-insulator
alternating material, (Me-3,5-DIP)[Ni(dmit)2]2, are presented. The NMR
absorption lines originating from metallic and insulating layers are well
resolved, which evidences the coexistence of localized spins (\pi_loc) and
conduction \pi-electrons. The insulating layer is newly found to undergo
antiferromagnetic long range order at about 2.5 K, suggesting emergence of
S=1/2 Mott insulator. In the metallic layer, we found significant suppressions
of static and dynamical susceptibilities of conduction electrons below 35 K,
where antiferromagnetic correlation in the insulating layer evolves. We propose
a dynamical effect through strong \pi-\pi_loc coupling between the metallic and
insulating layers as an origin of the reduction of the density of states.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 02:38:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fujiyama",
"Shigeki",
""
],
[
"Shitade",
"A.",
""
],
[
"Kanoda",
"K.",
""
],
[
"Kosaka",
"Y.",
""
],
[
"Yamamoto",
"H. M.",
""
],
[
"Kato",
"R.",
""
]
] |
0708.1641 | Yan Huo | Yan Huo, Heng Liang, Si-Qi Liu, Fengshan Bai | Approximating the monomer-dimer constants through matrix permanent | 6 pages, 2 figures | null | 10.1103/PhysRevE.77.016706 | null | cond-mat.stat-mech | null | The monomer-dimer model is fundamental in statistical mechanics. However, it
is $#P$-complete in computation, even for two dimensional problems. A
formulation in matrix permanent for the partition function of the monomer-dimer
model is proposed in this paper, by transforming the number of all matchings of
a bipartite graph into the number of perfect matchings of an extended bipartite
graph, which can be given by a matrix permanent. Sequential importance sampling
algorithm is applied to compute the permanents. For two-dimensional lattice
with periodic condition, we obtain $ 0.6627\pm0.0002$, where the exact value is
$h_2=0.662798972834$. For three-dimensional lattice with periodic condition,
our numerical result is $ 0.7847\pm0.0014$, {which agrees with the best known
bound $0.7653 \leq h_3 \leq 0.7862$.}
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 17:07:02 GMT"
},
{
"version": "v2",
"created": "Wed, 15 Aug 2007 14:45:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Huo",
"Yan",
""
],
[
"Liang",
"Heng",
""
],
[
"Liu",
"Si-Qi",
""
],
[
"Bai",
"Fengshan",
""
]
] |
0708.1642 | Sang-Koog Kim | Sangkook Choi and Sang-Koog Kim | Total Reflection and Negative Refraction of Dipole-Exchange Spin Waves
at Magnetic Interfaces: Micromagnetic Modeling Study | 13 pages, 5 figures | Appl Phys Lett 92, 212501 (2008) | 10.1063/1.2936294 | null | cond-mat.other | null | We demonstrated that dipole-exchange spin waves traveling in geometrically
restricted magnetic thin films satisfy the same laws of reflection and
refraction as light waves. Moreover, we found for the first time novel wave
behaviors of dipole-exchange spin waves such as total reflection and negative
refraction. The total reflection in laterally inhomogeneous thin films composed
of two different magnetic materials is associated with the forbidden modes of
refracted dipole-exchange spin waves. The negative refraction occurs at a 90
degree domain-wall magnetic interface that is introduced by a cubic magnetic
anisotropy in the media, through the anisotropic dispersion of dipole-exchange
spin waves.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 04:07:51 GMT"
}
] | 2010-02-03T00:00:00 | [
[
"Choi",
"Sangkook",
""
],
[
"Kim",
"Sang-Koog",
""
]
] |
0708.1643 | Ying-Qiu Gu | Ying-Qiu Gu | Local Lorentz Transformation and "Lorentz Violation" | 15 pages, no figures | null | null | null | physics.gen-ph | null | Some solutions to the anomalies of ultra high energy cosmic-ray(UHECR) and
TeV $\gamma$-rays require disturbed non-quadratic dispersion relations, which
suggest the Lorentz violation. Also, some new theories such as quantum gravity,
string theory and the standard model extension imply the Lorentz violation. In
this paper, we derive some transformation laws for the classical parameters of
nonlinear field system, and then provide their dispersion relations. These
dispersion relations also have non-quadratic form but keep the Lorentz
invariance. The analysis of this paper may be helpful for understanding the
quantum theory and the plausible Lorentz violation.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 06:20:02 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Gu",
"Ying-Qiu",
""
]
] |
0708.1644 | L. C. Garcia de Andrade | Garcia de Andrade | Ricci curvature and geodesic flows stability in Riemannian twisted flux
tubes | DFT-IF-UERJ-Brasil | null | null | null | physics.flu-dyn | null | Ricci and sectional curvatures of twisted flux tubes in Riemannian manifold
are computed to investigate the stability of the tubes. The geodesic equations
are used to show that in the case of thick tubes, the curvature of planar
(Frenet torsion-free) tubes have the effect ct of damping the flow speed along
the tube. Stability of geodesic flows in the Riemannian twisted thin tubes
(almost filaments), against constant radial perturbations is investigated by
using the method of negative sectional curvature for unstable flows. No special
form of the flow like Beltrami flows is admitted, and the proof is general for
the case of thin tubes. It is found that for positive perturbations and angular
speed of the flow, instability is achieved, since the sectional Ricci curvature
of the twisted tube metric is negative.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 05:02:49 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"de Andrade",
"Garcia",
""
]
] |
0708.1645 | Masao Iwamatsu | Masao Iwamatsu | Cell dynamics simulation of droplet and bridge formation within striped
nano-capillaries | 21 pages, 7 figures, Langmuir accepted for publication | null | null | null | cond-mat.soft | null | The kinetics of droplet and bridge formation within striped nano-capillaries
is studied when the wetting film grows via interface-limited growth. The
phenomenological time-dependent Ginzburg-Landau (TDGL)-type model with thermal
noise is used and numerically solved using the cell dynamics method. The model
is two-dimensional and consists of undersaturated vapor confined within a
nano-capillary made of two infinitely wide flat substrates. The surface of the
substrate is chemically heterogeneous with a single stripe of lyophilic domain
that exerts long-range attractive potential to the vapor molecule. The dynamics
of nucleation and subsequent growth of droplet and bridge can be simulated and
visualized. In particular, the evolution of the morphology from droplet or bump
to bridge is clearly identified. Crucial role played by the substrate potential
on the morphology of bridge of nanoscopic size is clarified. Nearly
temperature-independent evolution of capillary condensation is predicted when
the interface-limited growth dominates. In addition, it is shown that the
dynamics of capillary condensation follows the scenario of capillary
condensation proposed by Everett and Haynes three decades ago.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 05:31:41 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Iwamatsu",
"Masao",
""
]
] |
0708.1646 | Hua Qin | Hyun S. Kim, Hua Qin, and Robert H. Blick | Self Excitation of Nano-Mechanical Pillars | 19 pages including 4 figures | null | null | null | cond-mat.mes-hall | null | Self excitation is a mechanism which is ubiquitous for electromechanical
power devices such as electrical generators. This is conventionally achieved by
making use of the magnetic field component in electrical generators [1], where
a good example are the overall visible wind farm turbines [2]. In other words,
a static force, like wind acting on the rotor blades, can generate a resonant
excitation at a certain mechanical frequency. For nanomechanical systems
[3,4,5] such a self excitation (SE) mechanism is highly desirable as well,
since it can generate mechanical oscillations at radio frequencies by simply
applying a DC bias voltage. This is of great importance for low-power signal
communication devices and detectors, as well as for mechanical computing
elements. For a particular nanomechanical system - the single electron shuttle
- this effect was predicted some time ago by Gorelik et al. [6]. Here, we use a
nano-electromechanical single electron transistor (NEMSET) to demonstrate self
excitation for both the soft and hard regime, respectively. The ability to use
self excitation in nanomechanical systems may enable the detection of quantum
mechanical backaction effects [7] in direct tunneling, macroscopic quantum
tunneling [8], and rectification [9]. All these effects have so far been over
shadowed by the large driving voltages, which had to be applied.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 05:56:07 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Kim",
"Hyun S.",
""
],
[
"Qin",
"Hua",
""
],
[
"Blick",
"Robert H.",
""
]
] |
0708.1647 | Hagai B. Perets | G. Vidali, V. Pirronello, L. Li, J. Roser, G. Manico, R. Mehl, A.
Lederhendler, H. B. Perets, J. R. Brucato, O. Biham | Molecular Hydrogen Formation on Low Temperature Surfaces in Temperature
Programmed Desorption Experiments | 30 pages, 1 table, 6 figures. Published version | J. Phys. Chem. A, 2007, 111 (49), 12611 | 10.1021/jp0760657 | null | physics.chem-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of the formation of molecular hydrogen on low temperature surfaces
is of interest both because it allows to explore elementary steps in the
heterogeneous catalysis of a simple molecule and because of the applications in
astrochemistry. Here we report results of experiments of molecular hydrogen
formation on amorphous silicate surfaces using temperature-programmed
desorption (TPD). In these experiments beams of H and D atoms are irradiated on
the surface of an amorphous silicate sample. The desorption rate of HD
molecules is monitored using a mass spectrometer during a subsequent TPD run.
The results are analyzed using rate equations and the activation energies of
the processes leading to molecular hydrogen formation are obtained from the TPD
data. We show that a model based on a single isotope provides the correct
results for the activation energies for diffusion and desorption of H atoms.
These results can thus be used to evaluate the formation rate of H_2 on dust
grains under the actual conditions present in interstellar clouds.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 06:16:05 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Nov 2008 06:23:55 GMT"
}
] | 2008-11-21T00:00:00 | [
[
"Vidali",
"G.",
""
],
[
"Pirronello",
"V.",
""
],
[
"Li",
"L.",
""
],
[
"Roser",
"J.",
""
],
[
"Manico",
"G.",
""
],
[
"Mehl",
"R.",
""
],
[
"Lederhendler",
"A.",
""
],
[
"Perets",
"H. B.",
""
],
[
"Brucato",
"J. R.",
""
],
[
"Biham",
"O.",
""
]
] |
0708.1648 | Yanchun Liang | Y. C. Liang (1,2), F. Hammer (2), S. Y. Yin (1,3,4), H. Flores (2), M.
Rodrigues (2), Yanbin Yang (2,1) ((1) NAOC, China; (2) GEPI, Observatoire de
Paris-Meudon, France; (3) Department of Physics, Hebei Normal University,
China; (4) Department of Physics, Harbin University, China) | The direct oxygen abundances of metal-rich galaxies derived from
electron temperature | 13 pages, 12 figures, 2 tables, accepted by A&A | null | 10.1051/0004-6361:20077436 | null | astro-ph | null | We aim to derive the electron temperature Te in the gas of metal-rich
star-forming galaxies, which can be obtained from their ratios of auroral lines
[O II]7320,7330 to nebular lines [O II]3727, in order to establish a more
robust mass-metallicity relationship, and compare the Te-based (O/H) abundances
with those from empirical strong-line calibrations, such as R23. We obtained 27
spectra by stacking the spectra of several hundred (even several thousand)
star-forming galaxies selected from the SDSS-DR4 in each of the 27 stellar mass
bins from log(M*) ~8.0 to 10.6 (logMsun). This "stack" method sufficiently
improves the signal-to-noise ratio of the auroral lines [O II]7320,7330, which
allow us to reliably obtain the electron temperature t2 in the low ionization
region from the ratio of [O II]7320,7330 to [O II]3727, then t3 in the high
ionization region from t2 by using a relation, and then the direct (O/H)
abundances from Te. The results show that the empirical R23 method will
overestimate the log(O/H) by 0.2 to 0.6 dex for these moderate metal-rich
galaxies. The new metal-mass relationship of the galaxies with moderate
metallicities is fitted by a linear fit (12+log(O/H) =6.223+0.231*logM*)
confirming that empirical methods significantly overestimate (O/H). We also
derived their (N/O) abundance ratios on the basis of the Te method, which are
consistent with the combination of the primary and secondary components of
nitrogen. For actual use, we re-derive the relations of 12+log(O/H)(Bay) vs.
logM* and 12+log(O/H)(Bay) vs. logR23 from the SDSS-DR4 data, which are a bit
different from those derived from DR2.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 07:55:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Liang",
"Y. C.",
""
],
[
"Hammer",
"F.",
""
],
[
"Yin",
"S. Y.",
""
],
[
"Flores",
"H.",
""
],
[
"Rodrigues",
"M.",
""
],
[
"Yang",
"Yanbin",
""
]
] |
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