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801.1273
Alexander K. Hartmann
Sebastian Panknin, Alexander K. Hartmann, and Tim Salditt
X-Ray Propagation in Tapered Waveguides: Simulation and Optimization
10 pages, 3 figures
null
10.1016/j.optcom.2008.01.013
null
cond-mat.mtrl-sci
null
We use the parabolic wave equation to study the propagation of x-rays in tapered waveguides by numercial simulation and optimization. The goal of the study is to elucidate how beam concentration can be best achieved in x-ray optical nanostructures. Such optimized waveguides can e.g. be used to investigate single biomolecules. Here, we compare tapering geometries, which can be parametrized by linear and third-order (Bezier-type) functions and can be fabricated using standard e-beam litography units. These geometries can be described in two and four-dimensional parameter spaces, respectively. In both geometries, we observe a rugged structure of the optimization problem's ``gain landscape''. Thus, the optimization of x-ray nanostructures in general will be a highly nontrivial optimization problem.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 16:41:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Panknin", "Sebastian", "" ], [ "Hartmann", "Alexander K.", "" ], [ "Salditt", "Tim", "" ] ]
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801.1274
Kei-Ichi Kondo
Kei-Ichi Kondo (Chiba Univ., Japan)
Wilson loop and magnetic monopole through a non-Abelian Stokes theorem
48 pages, 8 figures; minor changes, version to be published in Physical Review D
Phys.Rev.D77:085029,2008
10.1103/PhysRevD.77.085029
CHIBA-EP-169
hep-th hep-ph
null
We show that the Wilson loop operator for SU(N) Yang-Mills gauge connection is exactly rewritten in terms of conserved gauge-invariant magnetic and electric currents through a non-Abelian Stokes theorem of the Diakonov-Petrov type. Here the magnetic current originates from the magnetic monopole derived in the gauge-invariant way from the pure Yang--Mills theory even in the absence of the Higgs scalar field, in sharp contrast to the 't Hooft-Polyakov magnetic monopole in the Georgi-Glashow gauge-Higgs model. The resulting representation indicates that the Wilson loop operator in fundamental representations can be a probe for a single magnetic monopole irrespective of $N$ in SU(N) Yang-Mills theory, against the conventional wisdom. Moreover, we show that the quantization condition for the magnetic charge follows from the fact that the non-Abelian Stokes theorem does not depend on the surface chosen for writing the surface integral. The obtained geometrical and topological representations of the Wilson loop operator have important implications to understanding quark confinement according to the dual superconductor picture.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 16:45:42 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 11:45:53 GMT" } ]
2008-11-26T00:00:00
[ [ "Kondo", "Kei-Ichi", "", "Chiba Univ., Japan" ] ]
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801.1275
Christophe Roche
Christophe Roche (LISTIC)
Le terme et le concept : fondements d'une ontoterminologie
22 pages
Dans TOTh 2007 : Terminologie et Ontologie : Th\'eories et Applications - TOTh 2007 : Terminologie et Ontologie : Th\'eories et Applications, Annecy : France (2007)
null
null
cs.AI
null
Most definitions of ontology, viewed as a "specification of a conceptualization", agree on the fact that if an ontology can take different forms, it necessarily includes a vocabulary of terms and some specification of their meaning in relation to the domain's conceptualization. And as domain knowledge is mainly conveyed through scientific and technical texts, we can hope to extract some useful information from them for building ontology. But is it as simple as this? In this article we shall see that the lexical structure, i.e. the network of words linked by linguistic relationships, does not necessarily match the domain conceptualization. We have to bear in mind that writing documents is the concern of textual linguistics, of which one of the principles is the incompleteness of text, whereas building ontology - viewed as task-independent knowledge - is concerned with conceptualization based on formal and not natural languages. Nevertheless, the famous Sapir and Whorf hypothesis, concerning the interdependence of thought and language, is also applicable to formal languages. This means that the way an ontology is built and a concept is defined depends directly on the formal language which is used; and the results will not be the same. The introduction of the notion of ontoterminology allows to take into account epistemological principles for formal ontology building.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 20:12:02 GMT" } ]
2008-01-09T00:00:00
[ [ "Roche", "Christophe", "", "LISTIC" ] ]
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801.1276
Shashi Kiran Chilappagari
Shashi Kiran Chilappagari, Dung Viet Nguyen, Bane Vasic, Michael Marcellin
On the guaranteed error correction capability of LDPC codes
5 pages, submitted to IEEE International Symposium on Information Theory (ISIT), 2008
null
10.1109/ISIT.2008.4595023
null
cs.IT math.IT
null
We investigate the relation between the girth and the guaranteed error correction capability of $\gamma$-left regular LDPC codes when decoded using the bit flipping (serial and parallel) algorithms. A lower bound on the number of variable nodes which expand by a factor of at least $3 \gamma/4$ is found based on the Moore bound. An upper bound on the guaranteed correction capability is established by studying the sizes of smallest possible trapping sets.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 16:53:08 GMT" } ]
2016-11-17T00:00:00
[ [ "Chilappagari", "Shashi Kiran", "" ], [ "Nguyen", "Dung Viet", "" ], [ "Vasic", "Bane", "" ], [ "Marcellin", "Michael", "" ] ]
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801.1277
Mirko Tarulli
S. Cuccagna, M. Tarulli
On asymptotic stability in energy space of ground states of NLS in 2D
null
null
10.1016/j.anihpc.2008.12.001
null
math.AP math.FA
null
We transpose work by K.Yajima and by T.Mizumachi to prove dispersive and smoothing estimates for dispersive solutions of the linearization at a ground state of a Nonlinear Schr\"odinger equation (NLS) in 2D. As an application we extend to dimension 2D a result on asymptotic stability of ground states of NLS proved in the literature for all dimensions different from 2.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 16:55:08 GMT" } ]
2015-05-13T00:00:00
[ [ "Cuccagna", "S.", "" ], [ "Tarulli", "M.", "" ] ]
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801.1278
Andrea Baronchelli
Andrea Baronchelli, Michele Catanzaro, Romualdo Pastor-Satorras
Random walks on complex trees
9 pages, 13 figures (extended version of previous "Random walks on scale-free trees")
Phys. Rev. E 78, 011114 (2008)
10.1103/PhysRevE.78.011114
null
cond-mat.stat-mech cond-mat.dis-nn math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the properties of random walks on complex trees. We observe that the absence of loops reflects in physical observables showing large differences with respect to their looped counterparts. First, both the vertex discovery rate and the mean topological displacement from the origin present a considerable slowing down in the tree case. Second, the mean first passage time (MFPT) displays a logarithmic degree dependence, in contrast to the inverse degree shape exhibited in looped networks. This deviation can be ascribed to the dominance of source-target topological distance in trees. To show this, we study the distance dependence of a symmetrized MFPT and derive its logarithmic profile, obtaining good agreement with simulation results. These unique properties shed light on the recently reported anomalies observed in diffusive dynamical systems on trees.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:15:27 GMT" }, { "version": "v2", "created": "Tue, 10 Jun 2008 09:25:19 GMT" } ]
2008-10-21T00:00:00
[ [ "Baronchelli", "Andrea", "" ], [ "Catanzaro", "Michele", "" ], [ "Pastor-Satorras", "Romualdo", "" ] ]
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801.1279
Craig O. Heinke
Craig O. Heinke (U. Virginia), Ashley J. Ruiter (NMSU), Michael P. Muno (Caltech), Krzysztof Belczynski (NMSU, Tombaugh Fellow)
Cataclysmic Variables in Globular Clusters, the Galactic Center, and Local Space
7 pages, 5 figures (in color; one bitmapped). Proceedings of "A Population Explosion: The Nature and Evolution of X-ray Binaries in Diverse Environments", St. Petersburg Beach, Florida, USA, 28 October - 2 November, 2007. v2: added acknowledgement
AIP Conf.Proc.1010:136-142,2008
10.1063/1.2945021
null
astro-ph
null
We compare the X-ray spectra and luminosities, in the 2-8 keV band, of known and suspected cataclysmic variables (CVs) in different environments, assessing the nature of these source populations. These objects include nearby CVs observed with ASCA; the Galactic Center X-ray source population identified by Muno et al.; and likely CVs identified in globular clusters. Both of the latter have been suggested to be dominated by magnetic CVs. We find that the brighter objects in both categories are likely to be magnetic CVs, but that the fainter objects are likely to include a substantial contribution from normal CVs. The strangely hard spectra observed from the Galactic Center sources reflect the high and variable extinction, which is significantly greater than the canonical 6e22 /cm2 over much of the region, and the magnetic nature of many of the brightest CVs. The total numbers of faint Galactic Center sources are compatible with expectations of the numbers of CVs in this field.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:01:30 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 21:37:20 GMT" } ]
2009-06-23T00:00:00
[ [ "Heinke", "Craig O.", "", "U. Virginia" ], [ "Ruiter", "Ashley J.", "", "NMSU" ], [ "Muno", "Michael P.", "", "Caltech" ], [ "Belczynski", "Krzysztof", "", "NMSU, Tombaugh Fellow" ] ]
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801.128
Dietrich Burde
Dietrich Burde, Karel Dekimpe, Sandra Deschamps
LR-algebras
null
null
null
null
math.RA
null
In the study of NIL-affine actions on nilpotent Lie groups we introduced so called LR-structures on Lie algebras. The aim of this paper is to consider the existence question of LR-structures, and to start a structure theory of LR-algebras. We show that any Lie algebra admitting an LR-structure is 2-step solvable. Conversely we find several classes of 2-step solvable Lie algebras admitting an LR-structure, but also classes not admitting such a structure. We study also ideals in LR-algebras, and classify low-dimensional real LR-algebras.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:01:32 GMT" } ]
2008-01-09T00:00:00
[ [ "Burde", "Dietrich", "" ], [ "Dekimpe", "Karel", "" ], [ "Deschamps", "Sandra", "" ] ]
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801.1281
Nicolas Doiron-Leyraud
Nicolas Doiron-Leyraud, Cyril Proust, David LeBoeuf, Julien Levallois, Jean-Baptiste Bonnemaison, Ruixing Liang, D. A. Bonn, W. N. Hardy, Louis Taillefer
Quantum oscillations and the Fermi surface in an underdoped high-Tc superconductor
null
Nature 447, 565 (31 May 2007)
10.1038/nature05872
null
cond-mat.supr-con cond-mat.str-el
null
Despite twenty years of research, the phase diagram of high transition- temperature superconductors remains enigmatic. A central issue is the origin of the differences in the physical properties of these copper oxides doped to opposite sides of the superconducting region. In the overdoped regime, the material behaves as a reasonably conventional metal, with a large Fermi surface. The underdoped regime, however, is highly anomalous and appears to have no coherent Fermi surface, but only disconnected "Fermi arcs". The fundamental question, then, is whether underdoped copper oxides have a Fermi surface, and if so, whether it is topologically different from that seen in the overdoped regime. Here we report the observation of quantum oscillations in the electrical resistance of the oxygen-ordered copper oxide YBa2Cu3O6.5, establishing the existence of a well-defined Fermi surface in the ground state of underdoped copper oxides, once superconductivity is suppressed by a magnetic field. The low oscillation frequency reveals a Fermi surface made of small pockets, in contrast to the large cylinder characteristic of the overdoped regime. Two possible interpretations are discussed: either a small pocket is part of the band structure specific to YBa2Cu3O6.5 or small pockets arise from a topological change at a critical point in the phase diagram. Our understanding of high-transition temperature (high-Tc) superconductors will depend critically on which of these two interpretations proves to be correct.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:02:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Doiron-Leyraud", "Nicolas", "" ], [ "Proust", "Cyril", "" ], [ "LeBoeuf", "David", "" ], [ "Levallois", "Julien", "" ], [ "Bonnemaison", "Jean-Baptiste", "" ], [ "Liang", "Ruixing", "" ], [ "Bonn", "D. A.", "" ], [ "Hardy", "W. N.", "" ], [ "Taillefer", "Louis", "" ] ]
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801.1282
Shashi Kiran Chilappagari
Shashi Kiran Chilappagari, Anantha Raman Krishnan, Bane Vasic
LDPC Codes Which Can Correct Three Errors Under Iterative Decoding
5 pages, 3 figures, submitted to IEEE Information Theory Workshop (ITW), 2008
null
10.1109/ITW.2008.4578696
null
cs.IT math.IT
null
In this paper, we provide necessary and sufficient conditions for a column-weight-three LDPC code to correct three errors when decoded using Gallager A algorithm. We then provide a construction technique which results in a code satisfying the above conditions. We also provide numerical assessment of code performance via simulation results.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:12:21 GMT" } ]
2016-11-17T00:00:00
[ [ "Chilappagari", "Shashi Kiran", "" ], [ "Krishnan", "Anantha Raman", "" ], [ "Vasic", "Bane", "" ] ]
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801.1283
Steve K. Lamoreaux
Steve K. Lamoreaux
Possible resolution of the Casimir force finite temperature correction "controversies"
2 figures, four pages
null
null
null
quant-ph
null
By considering the effect of diffusion on the external electric field response of charge carriers in metals and semiconductors, it is shown that the finite temperature correction proposed Bostrom and Sernelius requires substantial modification, and there is no large correction as suggested for good conductors. The apparent violation of the Third Law of Thermodynamics of the various proposed temperature corrections to the Casimir force is also resolved. Finally, the effect of Debye screening on electrostatic calibrations between pure germanium surfaces is calculated
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:15:40 GMT" } ]
2008-01-09T00:00:00
[ [ "Lamoreaux", "Steve K.", "" ] ]
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801.1284
Julieta Medina
Julieta Medina
Fuzzy Scalar Field Theories: Numerical and Analytical Investigations
Phd thesis, 185 pages
null
null
null
hep-th
null
This thesis is devoted to the study of Quantum Field Theories (QFT) on fuzzy spaces. Fuzzy spaces are approximations to the algebra of functions of a continuous space by a finite matrix algebra. In the limit of infinitely large matrices the formulation is exact. An attractive feature of this approach is that it transparently shows how the geometrical properties of the continuous space are preserved. In the study of the non-perturbative regime of QFT, fuzzy spaces provide a possible alternative to the lattice as a regularisation method. The thesis is divided into two parts. We perform Monte Carlo simulations of a $\lambda \phi^4$ theory on a 3-dimensional Euclidean space. We identify the phase diagram of this model. In addition to the usual disordered and uniform ordered phases we find a third phase of non-uniform ordering. This indicates the existence of the phenomenon called UV-IR mixing in the strong coupling regime. Second we present a geometrical analysis of the scalar field theory on a 4-dimensional fuzzy sphere, S4_F. Nevertheless a fuzzy version of S4 cannot be achieved by quantisation of the classical space. The problem is circumvented by defining a scalar theory on a larger space, CP3 which is 6-dimensional. It includes degrees of freedom related to S^4 plus others beyond S4. Those extra degrees of freedom are dynamically suppressed through a probabilistic method. The analysis of the geometrical structures allows us to interpret this procedure as a Kaluza-Klein reduction of CP3 to S4.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 16:41:01 GMT" } ]
2008-01-09T00:00:00
[ [ "Medina", "Julieta", "" ] ]
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801.1285
Soack Dae Yoon
S. D. Yoon, C. Vittoria, V. G. Harris, A. Widom, K. E. Miller, M. E. McHenry
Nano granular metallic Fe - oxygen deficient TiO$_{2-\delta}$ composite films: A room temperature, highly carrier polarized magnetic semiconductor
6 pages in Latex including 8 figures
null
10.1088/0953-8984/20/19/195206
null
cond-mat.mtrl-sci cond-mat.other
null
Nano granular metallic iron (Fe) and titanium dioxide (TiO$_{2-\delta}$) were co-deposited on (100) lanthanum aluminate (LaAlO$_3$) substrates in a low oxygen chamber pressure using a pulsed laser ablation deposition (PLD) technique. The co-deposition of Fe and TiO$_2$ resulted in $\approx$ 10 nm metallic Fe spherical grains suspended within a TiO$_{2-\delta}$ matrix. The films show ferromagnetic behavior with a saturation magnetization of 3100 Gauss at room temperature. Our estimate of the saturation magnetization based on the size and distribution of the Fe spheres agreed well with the measured value. The film composite structure was characterized as p-type magnetic semiconductor at 300 K with a carrier density of the order of $ 10^{22} /{\rm cm^3}$. The hole carriers were excited at the interface between the nano granular Fe and TiO$_{2-\delta}$ matrix similar to holes excited in the metal/n-type semiconductor interface commonly observed in Metal-Oxide-Semiconductor (MOS) devices. From the large anomalous Hall effect directly observed in these films it follows that the holes at the interface were strongly spin polarized. Structure and magneto transport properties suggested that these PLD films have potential nano spintronics applications.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:23:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Yoon", "S. D.", "" ], [ "Vittoria", "C.", "" ], [ "Harris", "V. G.", "" ], [ "Widom", "A.", "" ], [ "Miller", "K. E.", "" ], [ "McHenry", "M. E.", "" ] ]
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801.1286
Vinod Chandra
Vinod Chandra, Akhilesh Ranjan and V. Ravishankar
Hot QCD equations of state and response functions for quark-gluon plasma
11 pages, 10 figures, revtex4; 2 tables; several references added, Introduction revised; section.V revised; Fig.3 replaced
null
null
null
hep-ph nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the response functions (chromo-electric susceptibilities) of quark-gluon plasma as a function of temperature in the presence of interactions. We consider two equations of state for hot QCD. The first one is fully perturbative, of $O(g^5)$ EOS and, and the second one which is $O[g^6\ln(1/g)+\delta]$, incorporates some non-perturbative effects. Following a recent work (Physical Review {\bf C 76}, 054909(2007)), the interaction effects contained in the EOS are encapsulated in terms of effective chemical potentials($\tilde\mu$) in the equilibrium distribution functions for the partons.By using them in another recent formulation of the response functions({\tt arXiv:0707.3697}), we determine explicitly the chromo-electric susceptibilities for QCD plasma. We find that it shows large deviations from the ideal behavior. We further study the modification in the heavy quark potential due to the medium effects. In particular, we determine the temperature dependence of the screening lengths by fixing the effective coupling constant $Q$ which appears in the transport equation by comparing the screening in the present formalism with exact lattice QCD results. Finally, we study the dissociation phenomena of heavy quarkonium states such as $c\bar{c}$ and $b\bar{b}$, and determine the dissociation temperatures. Our results are in good agreement with recent lattice results.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:27:36 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 12:12:06 GMT" }, { "version": "v3", "created": "Tue, 1 Jul 2008 05:58:15 GMT" } ]
2008-07-01T00:00:00
[ [ "Chandra", "Vinod", "" ], [ "Ranjan", "Akhilesh", "" ], [ "Ravishankar", "V.", "" ] ]
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801.1287
Dieter Luest
Gia Dvali, Dieter Lust
Power of Black Hole Physics: Seeing through the Vacuum Landscape
33 pages
JHEP 0806:047,2008
10.1088/1126-6708/2008/06/047
CERN-PH-TH/2008-003, LMU-ASC 01/08, MPP-2008-6
hep-th
null
In this paper we generalize the black hole bound of arXiv:0706.2050 to de Sitter spaces, and apply it to various vacua in the landscape, with a special emphasis on slow-roll inflationary vacua. Non-trivial constraints on the lifetime and the Hubble expansion rate emerge. For example, the general tendency is, that for the fixed number and the increasing mass of the species, vacua must become more curved and more unstable, either classically or quantum mechanically. We also discuss the constraints on the lifetime of vacua in the landscape, due to decay into the neighboring states.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:30:01 GMT" } ]
2011-02-25T00:00:00
[ [ "Dvali", "Gia", "" ], [ "Lust", "Dieter", "" ] ]
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801.1288
David Swinarski
David Swinarski
GIT stability of weighted pointed curves
41 pages
null
null
null
math.AG
null
Here I give a direct proof that smooth curves with distinct marked points are asymptotically Hilbert stable with respect to a wide range of parameter spaces and linearizations. This result can be used to construct the coarse moduli space of Deligne-Mumford stable pointed curves \bar M_g,n and Hassett's moduli spaces of weighted pointed curves \bar M_g,A (though the full construction of the moduli spaces is not contained in this paper, only the stability proof). My proof follows Gieseker's approach to reduce to the GIT problem to a combinatorial problem, though the solution is very different. The action of any 1-PS lambda on a curve C in P^N gives rise to weighted filtrations of H^0 (C, O(1)) and H^0 (C, O(m)), and I give a recipe in terms of the combinatorics of the base loci of the stages of these filtrations for showing that C is stable with respect to lambda.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:43:21 GMT" } ]
2008-01-09T00:00:00
[ [ "Swinarski", "David", "" ] ]
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801.1289
Thierry Levasseur
Thierry Levasseur
Radial components, prehomogeneous vector spaces, and rational Cherednik algebras
33 pages. Minor corrections
null
null
null
math.RT math.RA
null
Let V be a finite dimensional representation of the connected complex reductive group H. Denote by G the derived subgroup of H and assume that the categorical quotient of V by G is one dimensional. In this situation there exists a homomorphism, denoted by rad, from the algebra A of G-invariant differential operators on V to the first Weyl algebra. We show that the image of rad is isomorphic to the spherical subalgebra of a Cherednik algebra, whose parameters are determined by the b-function of the relative invariant associated to the prehomogeneous vector space (H : V). If (H : V) is furthemore assumed to be multiplicity free we obtain a Howe duality between a set of representations of G and modules over a subalgebra of the associative Lie algebra A. Some applications to holonomic modules and H-equivariant D-modules on V are also given.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:37:56 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 17:37:28 GMT" } ]
2008-01-31T00:00:00
[ [ "Levasseur", "Thierry", "" ] ]
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801.129
George Japaridze
M. Menteshashvili, N. Chachava and G. I. Japaridze
Effective Hamiltonian for a half-filled tetramerized ionic-Hubbard chain
8 pages, no figures or tables
null
null
null
cond-mat.str-el
null
We derive an effective spin Hamiltonian for the one-dimensional half-filled tetramerized ionic-Hubbard model in the limit of strong on-site repulsion. We show that the effective Hamiltonian which describes the low-energy spin sector of the model is a spin S=1/2 Heisenberg Hamiltonian with alternating nearest-neighbour exchange.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:44:14 GMT" } ]
2008-01-09T00:00:00
[ [ "Menteshashvili", "M.", "" ], [ "Chachava", "N.", "" ], [ "Japaridze", "G. I.", "" ] ]
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801.1291
Wang-Kong Tse
Wang-Kong Tse, Ben Yu-Kuang Hu, S. Das Sarma
Chirality-induced Dynamic Kohn Anomalies in Graphene
Accepted by PRL; updated version to appear in Physical Review Letters
Phys. Rev. Lett. 101, 066401 (2008)
10.1103/PhysRevLett.101.066401
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a theory for the renormalization of the phonon energy dispersion in graphene due to the combined effects of both Coulomb and electron-phonon (e-ph) interactions. We obtain the renormalized phonon energy spectrum by an exact analytic derivation of the phonon self-energy, finding three distinct Kohn anomalies (KAs) at the phonon wavevector $q = \omega/v, 2k_F\pm\omega/v$ for LO phonons and one at $q = \omega/v$ for TO phonons. The presence of these new KAs in graphene, in contrast to the usual KA $q = 2k_F$ in ordinary metals, originates from the dynamical screening of e-ph interaction (with a concomitant breakdown of the Born-Oppenheimer approximation) and the peculiar chirality of the graphene e-ph coupling.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:46:43 GMT" }, { "version": "v2", "created": "Fri, 18 Jul 2008 21:33:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Tse", "Wang-Kong", "" ], [ "Hu", "Ben Yu-Kuang", "" ], [ "Sarma", "S. Das", "" ] ]
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801.1292
Victor Tarkhanov
Victor I. Tarkhanov (1) and Michael M. Nesterov (2) ((1) St. Petersburg State Polytechnic University, St. Petersburg, Russia, (2) St. Petersburg Institute for Informatics and Automation, Russian Academy of Sciences, St. Petersburg, Russia)
Geometric information in eight dimensions vs. quantum information
14 pages, presented at International Symposium "Quantum Informatics 2007", October 3rd - 5th, 2007, Moscow Zvenigorod, Russia
null
10.1117/12.801913
null
quant-ph
null
Complementary idempotent paravectors and their ordered compositions, are used to represent multivector basis elements of geometric Clifford algebra for 3D Euclidean space as the states of a geometric byte in a given frame of reference. Two layers of information, available in real numbers, are distinguished. The first layer is a continuous one. It is used to identify spatial orientations of similar geometric objects in the same computational basis. The second layer is a binary one. It is used to manipulate with 8D structure elements inside the computational basis itself. An oriented unit cube representation, rather than a matrix one, is used to visualize an inner structure of basis multivectors. Both layers of information are used to describe unitary operations -- reflections and rotations -- in Euclidian and Hilbert spaces. The results are compared with ones for quantum gates. Some consequences for quantum and classical information technologies are discussed.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 17:55:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Tarkhanov", "Victor I.", "" ], [ "Nesterov", "Michael M.", "" ] ]
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801.1293
Piercarlo Bonifacio
P. Bonifacio (1,2,3), J. Andersen (4,5), S. Andrievsky (6), B. Barbuy (7), T. C. Beers (8), E. Caffau (2), R. Cayrel (2), E. Depagne (9), P. Francois (2), J. I. Gonzalez Hernandez (1,2), C. J. Hansen (10), F. Herwig (11), V. Hill (2), S. A. Korotin (6), H.-G. Ludwig (1,2), P. Molaro (3), B. Nordstrom (4), B. Plez (12), F. Primas (10), T. Sivarani (8), F. Spite (2), M. Spite (2) ((1) CIFIST Marie Curie Excellence Team, (2) GEPI, Observatoire de Paris, CNRS, Universite' Paris Diderot, (3) Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Trieste, (4) The Niels Bohr Institute, Astronomy, (5) Nordic Optical Telescope, (6) Department of Astronomy and Astronomical Observatory, Odessa National University, (7) Universidade de Sao Paulo, Departamento de Astronomia, (8) Department of Physics & Astronomy and JINA: Joint Institute for Nuclear Astrophysics, Michigan State University, (9) Las Cumbres Observatory, Santa Barbara, (10) European Southern Observatory (ESO), (11) Keele Astrophysics Group, School of Physical and Geographical Sciences, Keele University, (12) GRAAL, Universit\'e de Montpellier II)
The ESO Large Programme First Stars
to be published in the proceedings of the Workshop "Science with VLT in the ELT era" 8-12 October 2007, Garching, ed. A. Moorwood
null
10.1007/978-1-4020-9190-2_6
null
astro-ph
null
In ESO period 65 (April-September 2000) the large programme 165.N-0276, led by Roger Cayrel, began making use of UVES at the Kueyen VLT telescope. Known within the Team and outside as ``First Stars'', it was aimed at obtaining high resolution, high signal-to-noise ratio spectra in the range 320 nm -- 1000 nm for a large sample of extremely metal-poor (EMP) stars identified from the HK objective prism survey.In this contribution we highlight the main results of the large programme.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 18:06:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Bonifacio", "P.", "" ], [ "Andersen", "J.", "" ], [ "Andrievsky", "S.", "" ], [ "Barbuy", "B.", "" ], [ "Beers", "T. C.", "" ], [ "Caffau", "E.", "" ], [ "Cayrel", "R.", "" ], [ "Depagne", "E.", "" ], [ "Francois", "P.", "" ], [ "Hernandez", "J. I. Gonzalez", "" ], [ "Hansen", "C. J.", "" ], [ "Herwig", "F.", "" ], [ "Hill", "V.", "" ], [ "Korotin", "S. A.", "" ], [ "Ludwig", "H. -G.", "" ], [ "Molaro", "P.", "" ], [ "Nordstrom", "B.", "" ], [ "Plez", "B.", "" ], [ "Primas", "F.", "" ], [ "Sivarani", "T.", "" ], [ "Spite", "F.", "" ], [ "Spite", "M.", "" ] ]
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801.1294
Bernard de Wit
Bernard de Wit, Hermann Nicolai, Henning Samtleben
Gauged Supergravities, Tensor Hierarchies, and M-Theory
32 pages; minor text changes and a few additional references
JHEP 0802:044,2008
10.1088/1126-6708/2008/02/044
ITP-UU-08/01; SPIN-08/01; AEI-2007-176; ENSL-00203073
hep-th
null
Deformations of maximal supergravity theories induced by gauging non-abelian subgroups of the duality group reveal the presence of charged M-theory degrees of freedom that are not necessarily contained in supergravity. The relation with M-theory degrees of freedom is confirmed by the representation assignments under the duality group of the gauge charges and the ensuing vector and tensor gauge fields. The underlying hierarchy of these gauge fields is required for consistency of general gaugings. As an example gauged maximal supergravity in three space-time dimensions is presented in a version where all possible tensor fields appear.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 18:05:28 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 00:05:12 GMT" } ]
2009-11-19T00:00:00
[ [ "de Wit", "Bernard", "" ], [ "Nicolai", "Hermann", "" ], [ "Samtleben", "Henning", "" ] ]
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801.1295
Mattias Marklund
Vitaly Bychkov, Mikhail Modestov and Mattias Marklund
The structure of weak shocks in quantum plasmas
13 pages, 4 figures, version to appear in Physics of Plasmas
null
10.1063/1.2894565
null
physics.plasm-ph
null
The structure of a weak shock in a quantum plasma is studied, taking into account both dissipation terms due to thermal conduction and dispersive quantum terms due to the Bohm potential. Unlike quantum systems without dissipations, even a small thermal conduction may lead to a stationary shock structure. In the limit of zero quantum effects, the monotonic Burgers solution for the weak shock is recovered. Still, even small quantum terms make the structure non-monotonic with the shock driving a train of oscillations into the initial plasma. The oscillations propagate together with the shock. The oscillations become stronger as the role of Bohm potential increases in comparison with thermal conduction. The results could be of importance for laser-plasma interactions, such as inertial confinement fusion plasmas, and in astrophysical environments, as well as in condensed matter systems.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 18:16:19 GMT" }, { "version": "v2", "created": "Fri, 22 Feb 2008 11:16:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Bychkov", "Vitaly", "" ], [ "Modestov", "Mikhail", "" ], [ "Marklund", "Mattias", "" ] ]
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801.1296
Atul Narang
Jason T. Noel and Atul Narang
Gene regulation in continuous cultures: A unified theory for bacteria and yeasts
67 pages, 20 figures
null
null
null
q-bio.CB q-bio.MN
null
During batch growth on mixtures of two growth-limiting substrates, microbes consume the substrates either sequentially or simultaneously. These growth patterns are manifested in all types of bacteria and yeasts. The ubiquity of these growth patterns suggests that they are driven by a universal mechanism common to all microbial species. In previous work, we showed that a minimal model accounting only for enzyme induction and dilution explains the phenotypes observed in batch cultures of various wild-type and mutant/recombinant cells. Here, we examine the extension of the minimal model to continuous cultures. We show that: (1) Several enzymatic trends, usually attributed to specific regulatory mechanisms such as catabolite repression, are completely accounted for by dilution. (2) The bifurcation diagram of the minimal model for continuous cultures, which classifies the substrate consumption pattern at any given dilution rate and feed concentrations, provides a a precise explanation for the empirically observed correlation between the growth patterns in batch and continuous cultures. (3) Numerical simulations of the model are in excellent agreement with the data. The model captures the variation of the steady state substrate concentrations, cell densities, and enzyme levels during the single- and mixed-substrate growth of bacteria and yeasts at various dilution rates and feed concentrations. (4) This variation is well-approximated by simple analytical expressions that furnish physical insights into the steady states of continuous cultures. The minimal model provides a framework for quantitating the effect of regulatory mechanisms. We illustrate this by analyzing several data sets from the literature.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 19:00:40 GMT" } ]
2008-01-09T00:00:00
[ [ "Noel", "Jason T.", "" ], [ "Narang", "Atul", "" ] ]
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801.1297
Rosales Garcia J.Juan
J.J. Rosales and V.I. Tkach
Supersymmetric Barotropic FRW Model and Dark Energy
11 pages, minor corrections, published version
Modern Physics Letters A 24, 1257-1266 (2009)
10.1142/S0217732309030618
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using the superfield approach we construct the $n=2$ supersymmetric lagrangian for the FRW Universe with barotropic perfect fluid as matter field. The obtained supersymmetric algebra allowed us to take the square root of the Wheeler-DeWitt equation and solve the corresponding quantum constraint. This model leads to the relation between the vacuum energy density and the energy density of the dust matter.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 18:34:55 GMT" }, { "version": "v2", "created": "Sat, 20 Jun 2009 19:51:46 GMT" } ]
2015-05-13T00:00:00
[ [ "Rosales", "J. J.", "" ], [ "Tkach", "V. I.", "" ] ]
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801.1298
Roberto Galvan-Madrid
Roberto Galv\'an-Madrid (1,2), Luis F. Rodr\'iguez (1), Paul T. P. Ho (2,3) and Eric Keto (2) ((1) Centro de Radioastronom\'ia y Astrof\'isica UNAM, M\'exico. (2) Harvard-Smithsonian Center for Astrophysics, USA. (3) Academia Sinica Institute of Astronomy and Astrophysics, Taiwan)
Time Variation in G24.78+0.08 A1: Evidence for an Accreting Hypercompact H II Region?
10 pages, 1 figure, accepted in ApJ Letters
null
10.1086/528957
null
astro-ph
null
Over a timescale of a few years, an observed change in the optically thick radio continuum flux can indicate whether an unresolved H II region around a newly formed massive star is changing in size. In this Letter we report on a study of archival VLA observations of the hypercompact H II region G24.78+0.08 A1 that shows a decrease of ~ 45 % in the 6-cm flux over a five year period. Such a decrease indicates a contraction of ~ 25 % in the ionized radius and could be caused by an increase in the ionized gas density if the size of the H II region is determined by a balance between photoionization and recombination. This finding is not compatible with continuous expansion of the H II region after the end of accretion onto the ionizing star, but is consistent with the hypothesis of gravitational trapping and ionized accretion flows if the mass-accretion rate is not steady.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 18:55:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Galván-Madrid", "Roberto", "" ], [ "Rodríguez", "Luis F.", "" ], [ "Ho", "Paul T. P.", "" ], [ "Keto", "Eric", "" ] ]
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801.1299
Evgeny Epelbaum
E. Epelbaum, H. Krebs, and Ulf-G. Mei{\ss}ner
Isospin-breaking two-nucleon force with explicit Delta-excitations
10 pages, 4 figures
Phys.Rev.C77:034006,2008
10.1103/PhysRevC.77.034006
FZJ-IKP-TH-2007-36, HISKP-TH-07/29
nucl-th
null
We study the leading isospin-breaking contributions to the two-nucleon two-pion exchange potential due to explicit Delta degrees of freedom in chiral effective field theory. In particular, we find important contributions due to the delta mass splittings to the charge symmetry breaking potential that act opposite to the effects induced by the nucleon mass splitting.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 18:56:46 GMT" } ]
2009-07-29T00:00:00
[ [ "Epelbaum", "E.", "" ], [ "Krebs", "H.", "" ], [ "Meißner", "Ulf-G.", "" ] ]
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801.13
Igor Razgon
Igor Razgon and Barry O'Sullivan
Almost 2-SAT is Fixed-Parameter Tractable
This new version fixes the bug found by Somnath Sikdar in the proof of Claim 8. In the repaired version the modification of the Almost 2-SAT problem called 2-SLASAT is no longer needed and only the modification called 2-ASLASAT remains relevant. Hence the whole manuscript is updated so that the 2-SLASAT problem is not mentioned there anymore
null
null
null
cs.DS cs.CG cs.LO
null
We consider the following problem. Given a 2-CNF formula, is it possible to remove at most $k$ clauses so that the resulting 2-CNF formula is satisfiable? This problem is known to different research communities in Theoretical Computer Science under the names 'Almost 2-SAT', 'All-but-$k$ 2-SAT', '2-CNF deletion', '2-SAT deletion'. The status of fixed-parameter tractability of this problem is a long-standing open question in the area of Parameterized Complexity. We resolve this open question by proposing an algorithm which solves this problem in $O(15^k*k*m^3)$ and thus we show that this problem is fixed-parameter tractable.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 19:04:14 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 19:24:05 GMT" }, { "version": "v3", "created": "Mon, 18 Feb 2008 15:14:49 GMT" }, { "version": "v4", "created": "Fri, 18 Apr 2008 14:07:04 GMT" } ]
2008-04-18T00:00:00
[ [ "Razgon", "Igor", "" ], [ "O'Sullivan", "Barry", "" ] ]
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801.1301
Bernard Cretin
B. Cretin, D. Vernier
Quantized amplitudes in a nonlinear resonant electrical circuit
9 pages, 7 figures, 14 references
null
null
null
physics.ins-det physics.gen-ph
null
We present a simple nonlinear resonant analog circuit which demonstrates quantization of resonating amplitudes, for a given excitation level. The system is a simple RLC resonator where C is an active capacitor whose value is related to the current in the circuit. This variation is energetically equivalent to a variation of the potential energy and the circuit acts as a pendulum in the gravitational field. The excitation voltage, synchronously switched at the current frequency, enables electrical supply and keeping the oscillation of the system. The excitation frequency has been set to high harmonic of the fundamental oscillation so that anisochronicity can keep constant the amplitude of the circuit voltage and current. The behavior of the circuit is unusual: different stable amplitudes have been measured depending on initial conditions and excitation frequency, for the same amplitude of the excitation. The excitation frequency is naturally divided by the circuit and the ratio is kept constant without external disturbance. Moreover, a variation of the dumping does not affect significantly the amplitudes as long as the oscillation is observed. And lastly, electrical pulses can change, as in quantum systems, the operating amplitude which is auto-stable without disturbances. Many applications of this circuit can be imagined in microelectronics (including computing), energy conversion and time and frequency domains.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 19:22:47 GMT" } ]
2008-01-09T00:00:00
[ [ "Cretin", "B.", "" ], [ "Vernier", "D.", "" ] ]
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801.1302
Jan Steggemann
O. Actis, M. Erdmann, A. Henrichs, A. Hinzmann, M. Kirsch, G. M\"uller, J. Steggemann
Automated Reconstruction of Particle Cascades in High Energy Physics Experiments
8 pages, 2 figures. Submitted to Computational Science & Discovery
null
null
null
physics.data-an hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a procedure for reconstructing particle cascades from event data measured in a high energy physics experiment. For evaluating the hypothesis of a specific physics process causing the observed data, all possible reconstruction versions of the scattering process are constructed from the final state objects. We describe the procedure as well as examples of physics processes of different complexity studied at hadron-hadron colliders. We estimate the performance by 20 microseconds per reconstructed decay vertex, and 0.6 kByte per reconstructed particle in the decay trees.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 20:42:58 GMT" }, { "version": "v2", "created": "Mon, 8 Sep 2008 13:50:46 GMT" } ]
2008-09-08T00:00:00
[ [ "Actis", "O.", "" ], [ "Erdmann", "M.", "" ], [ "Henrichs", "A.", "" ], [ "Hinzmann", "A.", "" ], [ "Kirsch", "M.", "" ], [ "Müller", "G.", "" ], [ "Steggemann", "J.", "" ] ]
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801.1303
Alexander Goessling
A. G\"ossling, U. Kuhlmann, C. Thomsen, A. L\"offert, C. Gross, and W. Assmus
Magnetic excitations in SrCu2O3: a Raman scattering study
4 pages, 3 figures
Phys. Rev. B 67, 052403 (2003)
10.1103/PhysRevB.67.052403
null
cond-mat.str-el
null
We investigated temperature dependent Raman spectra of the one-dimensional spin-ladder compound SrCu2O3. At low temperatures a two-magnon peak is identified at 3160+/-10 cm^(-1) and its temperature dependence analyzed in terms of a thermal expansion model. We find that the two-magnon peak position must include a cyclic ring exchange of J_cycl/J_perp=0.09-0.25 with a coupling constant along the rungs of J_perp approx. 1215 cm^(-1) (1750 K) in order to be consistent with other experiments and theoretical results.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 19:47:41 GMT" } ]
2008-01-09T00:00:00
[ [ "Gössling", "A.", "" ], [ "Kuhlmann", "U.", "" ], [ "Thomsen", "C.", "" ], [ "Löffert", "A.", "" ], [ "Gross", "C.", "" ], [ "Assmus", "W.", "" ] ]
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801.1304
Christoph Boehme
A. Gliesche, C. Michel, V. Rajevac, K. Lips, S.D. Baranovskii, F. Gebhard, C. Boehme
Spin-dependent transition rates through exchange coupled localized spin pairs during coherent spin excitation
null
null
null
null
cond-mat.mtrl-sci
null
The effect of exchange interactions within spin pairs on spin-dependent transport and recombination rates through localized states in semiconductors during coherent electron spin resonant excitation is studied theoretically. It is shown that for identical spin systems, significant quantitative differences are to be expected between the results of pEDMR/pODMR experiments were permutation symmetry is the observable as compared to pESR experiments with polarization as the observable. It is predicted that beat oscillations of the spin nutations and not the nutations themselves dominate the transport or recombination rates when the exchange coupling strength or the field strength of the exciting radiation exceed the difference of the Zeeman energies within the spin pair. Furthermore, while the intensities of the rate oscillations decrease with increasing exchange within the spin pairs, the singlet and triplet signals retain their relative strength. This means that pEDMR and pODMR experiments could allow better experimental access to ESR forbidden singlet transitions which are hardly or not at all accessible with conventional pulsed electron spin resonance spectroscopy.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 19:50:51 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 21:39:09 GMT" } ]
2008-01-09T00:00:00
[ [ "Gliesche", "A.", "" ], [ "Michel", "C.", "" ], [ "Rajevac", "V.", "" ], [ "Lips", "K.", "" ], [ "Baranovskii", "S. D.", "" ], [ "Gebhard", "F.", "" ], [ "Boehme", "C.", "" ] ]
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801.1305
Leandro Aolita
L. Aolita, R. Chaves, D. Cavalcanti, A. Ac\'in, and L. Davidovich
Scaling laws for the decay of multiqubit entanglement
Minor mistakes corrected
Phys. Rev. Lett. 100, 080501 (2008)
10.1103/PhysRevLett.100.080501
null
quant-ph
null
We investigate the decay of entanglement of generalized N-particle Greenberger-Horne-Zeilinger (GHZ) states interacting with independent reservoirs. Scaling laws for the decay of entanglement and for its finite-time extinction (sudden death) are derived for different types of reservoirs. The latter is found to increase with the number of particles. However, entanglement becomes arbitrarily small, and therefore useless as a resource, much before it completely disappears, around a time which is inversely proportional to the number of particles. We also show that the decay of multi-particle GHZ states can generate bound entangled states.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 19:55:50 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 22:12:14 GMT" }, { "version": "v3", "created": "Wed, 20 Feb 2008 20:18:11 GMT" }, { "version": "v4", "created": "Mon, 3 Mar 2008 15:22:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Aolita", "L.", "" ], [ "Chaves", "R.", "" ], [ "Cavalcanti", "D.", "" ], [ "Acín", "A.", "" ], [ "Davidovich", "L.", "" ] ]
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801.1306
Seyed Abolfazl Motahari
Abolfazl S. Motahari, Amir K. Khandani
Capacity Bounds for the Gaussian Interference Channel
35 pages, 14 figures, submitted to IEEE Trans. on Inf. Theory
null
null
null
cs.IT math.IT
null
The capacity region of the two-user Gaussian Interference Channel (IC) is studied. Three classes of channels are considered: weak, one-sided, and mixed Gaussian IC. For the weak Gaussian IC, a new outer bound on the capacity region is obtained that outperforms previously known outer bounds. The sum capacity for a certain range of channel parameters is derived. For this range, it is proved that using Gaussian codebooks and treating interference as noise is optimal. It is shown that when Gaussian codebooks are used, the full Han-Kobayashi achievable rate region can be obtained by using the naive Han-Kobayashi achievable scheme over three frequency bands (equivalently, three subspaces). For the one-sided Gaussian IC, an alternative proof for the Sato's outer bound is presented. We derive the full Han-Kobayashi achievable rate region when Gaussian codebooks are utilized. For the mixed Gaussian IC, a new outer bound is obtained that outperforms previously known outer bounds. For this case, the sum capacity for the entire range of channel parameters is derived. It is proved that the full Han-Kobayashi achievable rate region using Gaussian codebooks is equivalent to that of the one-sided Gaussian IC for a particular range of channel parameters.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 19:56:00 GMT" } ]
2008-01-09T00:00:00
[ [ "Motahari", "Abolfazl S.", "" ], [ "Khandani", "Amir K.", "" ] ]
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801.1307
Chris Pollett
Chris Pollett and Eric Miles
Alternating Hierarchies for Time-Space Tradeoffs
14 pages
null
null
null
cs.CC cs.LO
null
Nepomnjascii's Theorem states that for all 0 <= \epsilon < 1 and k > 0 the class of languages recognized in nondeterministic time n^k and space n^\epsilon, NTISP[n^k, n^\epsilon ], is contained in the linear time hierarchy. By considering restrictions on the size of the universal quantifiers in the linear time hierarchy, this paper refines Nepomnjascii's result to give a sub- hierarchy, Eu-LinH, of the linear time hierarchy that is contained in NP and which contains NTISP[n^k, n^\epsilon ]. Hence, Eu-LinH contains NL and SC. This paper investigates basic structural properties of Eu-LinH. Then the relationships between Eu-LinH and the classes NL, SC, and NP are considered to see if they can shed light on the NL = NP or SC = NP questions. Finally, a new hierarchy, zeta -LinH, is defined to reduce the space requirements needed for the upper bound on Eu-LinH.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 19:59:05 GMT" } ]
2008-01-09T00:00:00
[ [ "Pollett", "Chris", "" ], [ "Miles", "Eric", "" ] ]
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801.1308
Codina Cotar
Codina Cotar, Jean-Dominique Deuschel, Stefan M\"uller
Strict convexity of the free energy for non-convex gradient models at moderate $\beta$
17 pages, 2 figures
null
null
null
math-ph math.MP
null
We consider a gradient interface model on the lattice with interaction potential which is a non-convex perturbation of a convex potential. We show using a one-step multiple scale analysis the strict convexity of the surface tension at high temperature. This is an extension of Funaki and Spohn's result, where the strict convexity of potential was crucial in their proof that for every tilt there is a unique, shift invariant, ergodic Gibbs measure for the $\nabla\phi$ field.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 20:39:14 GMT" } ]
2008-01-09T00:00:00
[ [ "Cotar", "Codina", "" ], [ "Deuschel", "Jean-Dominique", "" ], [ "Müller", "Stefan", "" ] ]
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801.1309
Vladimir Vovk
Vladimir Vovk
Game-theoretic Brownian motion
17 pages
null
null
null
math.PR
null
This paper suggests a perfect-information game, along the lines of Levy's characterization of Brownian motion, that formalizes the process of Brownian motion in game-theoretic probability. This is perhaps the simplest situation where probability emerges in a non-stochastic environment.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 20:07:26 GMT" } ]
2008-01-09T00:00:00
[ [ "Vovk", "Vladimir", "" ] ]
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801.131
Stefan Grosskinsky
Stefan Grosskinsky and Gunter M. Schutz
Discontinuous condensation transition and nonequivalence of ensembles in a zero-range process
39 pages, 7 figures; Journal version contains errors in (18) to (22) which have been corrected
J. Stat. Phys. 132(1), 77-108 (2008)
10.1007/s10955-008-9541-z
null
math-ph cond-mat.stat-mech math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a zero-range process where the jump rates do not only depend on the local particle configuration, but also on the size of the system. Rigorous results on the equivalence of ensembles are presented, characterizing the occurrence of a condensation transition. In contrast to previous results, the phase transition is discontinuous and the system exhibits ergodicity breaking and metastable phases. This leads to a richer phase diagram, including nonequivalence of ensembles in certain phase regions. The paper is motivated by results from granular clustering, where these features have been observed experimentally.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 20:11:41 GMT" }, { "version": "v2", "created": "Sat, 5 Jul 2008 01:06:10 GMT" } ]
2008-07-05T00:00:00
[ [ "Grosskinsky", "Stefan", "" ], [ "Schutz", "Gunter M.", "" ] ]
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801.1311
Constantino Tsallis
Sabir Umarov and Constantino Tsallis
On a representation of the inverse Fq transform
4 pages
null
10.1016/j.physleta.2008.04.071
null
cond-mat.stat-mech
null
A recent generalization of the Central Limit Theorem consistent with nonextensive statistical mechanics has been recently achieved through a generalized Fourier transform, noted $q$-Fourier transform. A representation formula for the inverse $q$-Fourier transform is here obtained in the class of functions $\mathcal{G}=\bigcup_{1\le q<3}\mathcal{G}_q,$ where $\mathcal{G}_{q}=\{f = a e_{q}^{-\beta x2}, \, a>0, \, \beta>0 \}$. This constitutes a first step towards a general representation of the inverse $q$-Fourier operation, which would enable interesting physical and other applications.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 20:17:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Umarov", "Sabir", "" ], [ "Tsallis", "Constantino", "" ] ]
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801.1312
Alexandre Filippov
A. T. Filippov (JINR, Dubna)
A New Integrable Model of (1+1)-Dimensional Dilaton Gravity Coupled to Toda Matter
10 pages; typos corrected, two footnotes and one reference added
null
null
E2-2007-190
hep-th
null
A new class of integrable two-dimensional dilaton gravity theories, in which scalar matter fields satisfy the Toda equations, is proposed. The simplest case of the Toda system is considered in some detail, and on this example we outline how the general solution can be obtained. Then we demonstrate how the wave-like solutions of the general Toda systems can be simply derived. In the dilaton gravity theory this solutions describe nonlinear waves coupled to gravity. A special attention is paid to making the analytic structure of the solutions of the Toda equations as simple and transparent as possible, with the aim to apply the idea of the separation of variables to non-integrable theories.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 20:20:47 GMT" }, { "version": "v2", "created": "Mon, 31 Mar 2008 08:06:26 GMT" } ]
2008-03-31T00:00:00
[ [ "Filippov", "A. T.", "", "JINR, Dubna" ] ]
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801.1313
Kazumi Okuyama
Kazumi Okuyama
N=4 SYM on K3 and the AdS(3)/CFT(2) Correspondence
10 pages; v5: typos corrected
JHEP 0802:036,2008
10.1088/1126-6708/2008/02/036
null
hep-th
null
We study the Fareytail expansion of the topological partition function of N=4 SU(N) super Yang-Mills theory on K3. We argue that this expansion corresponds to a sum over geometries in asymptotically AdS_3 spacetime, which is holographically dual to a large number of coincident fundamental heterotic strings.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 20:22:00 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 04:29:08 GMT" }, { "version": "v3", "created": "Fri, 11 Jan 2008 04:22:28 GMT" }, { "version": "v4", "created": "Mon, 14 Jan 2008 05:09:17 GMT" }, { "version": "v5", "created": "Wed, 30 Jan 2008 22:04:37 GMT" } ]
2009-12-10T00:00:00
[ [ "Okuyama", "Kazumi", "" ] ]
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801.1314
Yang Jiao
Y. Jiao, F. H. Stillinger and S. Torquato
Modeling Heterogeneous Materials via Two-Point Correlation Functions: II. Algorithmic Details and Applications
35 pages, 19 figures
null
10.1103/PhysRevE.77.031135
null
cond-mat.mtrl-sci
null
In the first part of this series of two papers, we proposed a theoretical formalism that enables one to model and categorize heterogeneous materials (media) via two-point correlation functions S2 and introduced an efficient heterogeneous-medium (re)construction algorithm called the "lattice-point" algorithm. Here we discuss the algorithmic details of the lattice-point procedure and an algorithm modification using surface optimization to further speed up the (re)construction process. The importance of the error tolerance, which indicates to what accuracy the media are (re)constructed, is also emphasized and discussed. We apply the algorithm to generate three-dimensional digitized realizations of a Fontainebleau sandstone and a boron carbide/aluminum composite from the two- dimensional tomographic images of their slices through the materials. To ascertain whether the information contained in S2 is sufficient to capture the salient structural features, we compute the two-point cluster functions of the media, which are superior signatures of the micro-structure because they incorporate the connectedness information. We also study the reconstruction of a binary laser-speckle pattern in two dimensions, in which the algorithm fails to reproduce the pattern accurately. We conclude that in general reconstructions using S2 only work well for heterogeneous materials with single-scale structures. However, two-point information via S2 is not sufficient to accurately model multi-scale media. Moreover, we construct realizations of hypothetical materials with desired structural characteristics obtained by manipulating their two-point correlation functions.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 20:23:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Jiao", "Y.", "" ], [ "Stillinger", "F. H.", "" ], [ "Torquato", "S.", "" ] ]
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801.1315
Tirthabir Biswas
Tirthabir Biswas
Emergence of a Cyclic Universe from the Hagedorn Soup
replaced with a shorter version which received ``Honorable Mention'' in the Gravity essay competition, details can be found in arXiv:0812.3182
null
null
IGC-08/1-2
hep-th astro-ph gr-qc hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One of the challenges of constructing a successful cyclic universe scenario is to be able to incorporate the second law of thermodynamics which typically leads to Tolman's problem of ever shrinking cycles. In this paper we construct a non-singular toy model where as the cycles shrink in the past they also spend more and more time in the entropy conserving Hagedorn phase. Thus in such a scenario the entropy asymptotes to a finite non-zero constant in the infinite past. The universe ``emerges'' from a small (string size) geodesically complete quasi-periodic space-time. This paradigm also naturally addresses some of the classic puzzles of Big Bang cosmology, such as the largeness, horizon and flatness problems.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 20:31:09 GMT" }, { "version": "v2", "created": "Sat, 1 Mar 2008 21:27:37 GMT" }, { "version": "v3", "created": "Fri, 31 Jul 2009 01:15:24 GMT" } ]
2009-07-31T00:00:00
[ [ "Biswas", "Tirthabir", "" ] ]
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801.1316
Mark Friesen
Sucismita Chutia, S. N. Coppersmith, Mark Friesen
Multiscale theory of valley splitting
4 pages, 2 figures
Phys. Rev. B 77, 193311 (2008)
10.1103/PhysRevB.77.193311
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
The coupling between $z$ valleys in the conduction band of a Si quantum well arises from phenomena occurring within several atoms from the interface, thus ruling out a theoretical description based on pure effective mass theory. However, the complexity and size of a realistic device precludes an analytical atomistic description. Here, we develop a fully analytical multiscale theory of valley coupling, by combining effective mass and tight binding approaches. The results are of particular interest for silicon qubits and quantum devices, but also provide insight for GaAs quantum wells.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 20:31:14 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 21:32:29 GMT" } ]
2013-08-26T00:00:00
[ [ "Chutia", "Sucismita", "" ], [ "Coppersmith", "S. N.", "" ], [ "Friesen", "Mark", "" ] ]
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801.1317
Viqar Husain
Viqar Husain
Gravitational collapse in quantum gravity
5 pages. Invited talk published in "Mathematical Physics: Proceedings of the 12th. Regional Conference," Eds. J. Aslam et. al. (World Scientific, Singapore, 2007)
null
null
null
gr-qc
null
We give a review of recent work aimed at understanding the dynamics of gravitational collapse in quantum gravity. Its goal is to provide a non-perturbative computational framework for understanding the emergence of the semi-classical approximation and Hawking radiation. The model studied is the gravity-scalar field theory in spherical symmetry. A quantization of this theory is given in which operators corresponding to null expansions and curvature are well defined. Together with the Hamiltonian, these operators allow one to follow the evolution of an initial matter-geometry state to a trapped configuration and beyond, in a singularity free and unitary setting.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 20:34:50 GMT" } ]
2008-01-09T00:00:00
[ [ "Husain", "Viqar", "" ] ]
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801.1318
Wei Pan
W. Pan, J.S. Xia, H.L. Stormer, D.C. Tsui, C. Vicente, E.D. Adams, N.S. Sullivan, L.N. Pfeiffer, K.W. Baldwin, and K.W. West
Experimental studies of the fractional quantum Hall effect in the first excited Landau level
to be published
null
10.1103/PhysRevB.77.075307
null
cond-mat.mes-hall
null
We present a spectrum of experimental data on the fractional quantum Hall effect (FQHE) states in the first excited Landau level, obtained in an ultrahigh mobility two-dimensional electron system (2DES) and at very low temperatures and report the following results: For the even-denominator FQHE states, the sample dependence of the nu=5/2 state clearly shows that disorder plays an important role in determining the energy gap at nu=5/2. For the developing nu=19/8 FQHE state the temperature dependence of the Rxx minimum implies an energy gap of ~5mK.The energy gaps of the odd-denominator FQHE states at nu=7/3 and 8/3 also increase with decreasing disorder, similar to the gap at 5/2 state. Unexpectedly and contrary to earlier data on lower mobility samples, in this ultra-high quality specimen, the nu=13/5 state is missing, while its particle-hole conjugate state, the nu=12/5 state, is a fully developed FQHE state. We speculate that this disappearance might indicate a spin polarization of the nu=13/5 state. Finally, the temperature dependence is studied for the two-reentrant integer quantum Hall states around nu=5/2 and is found to show a very narrow temperature range for the transition from quantized to classical value.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 23:00:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Pan", "W.", "" ], [ "Xia", "J. S.", "" ], [ "Stormer", "H. L.", "" ], [ "Tsui", "D. C.", "" ], [ "Vicente", "C.", "" ], [ "Adams", "E. D.", "" ], [ "Sullivan", "N. S.", "" ], [ "Pfeiffer", "L. N.", "" ], [ "Baldwin", "K. W.", "" ], [ "West", "K. W.", "" ] ]
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801.1319
Alexander Yong
Hugh Thomas, Alexander Yong
Longest increasing subsequences, Plancherel-type measure and the Hecke insertion algorithm
28 pages; companion software available at the authors' websites; v2 contains an Appendix by O. Zeitouni and the second author, which computes E(LIS) in the critical case
Advances in Applied Math., Vol 46 (2011), no.1-4, 610-642
null
null
math.CO math.PR
null
We define and study the Plancherel-Hecke probability measure on Young diagrams; the Hecke algorithm of [Buch-Kresch-Shimozono-Tamvakis-Yong '06] is interpreted as a polynomial-time exact sampling algorithm for this measure. Using the results of [Thomas-Yong '07] on jeu de taquin for increasing tableaux, a symmetry property of the Hecke algorithm is proved, in terms of longest strictly increasing/decreasing subsequences of words. This parallels classical theorems of [Schensted '61] and of [Knuth '70], respectively, on the Schensted and Robinson-Schensted-Knuth algorithms. We investigate, and conjecture about, the limit typical shape of the measure, in analogy with work of [Vershik-Kerov '77], [Logan-Shepp '77] and others on the ``longest increasing subsequence problem'' for permutations. We also include a related extension of [Aldous-Diaconis '99] on patience sorting. Together, these results provide a new rationale for the study of increasing tableau combinatorics, distinct from the original algebraic-geometric ones concerning K-theoretic Schubert calculus.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 21:22:45 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 22:26:39 GMT" } ]
2011-10-19T00:00:00
[ [ "Thomas", "Hugh", "" ], [ "Yong", "Alexander", "" ] ]
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801.132
Axel Brandenburg
A. Brandenburg (Nordita), K.-H. R\"adler (Potsdam), M. Schrinner (MPI f. Sonnensystemforschung)
Scale dependence of alpha effect and turbulent diffusivity
8 pages, 7 figures, submitted to A&A
Astron. Astrophys. 482, 739-746 (2008)
10.1051/0004-6361:200809365
NORDITA-2008-2
astro-ph
null
Aims: To determine alpha effect and turbulent magnetic diffusivity for mean magnetic fields with profiles of different length scale from simulations of isotropic turbulence, and to relate these results to nonlocal formulations in which alpha and the turbulent magnetic diffusivity correspond to integral kernels. Methods: A set of evolution equations for magnetic fields is solved which gives the response to imposed test fields, that is, mean magnetic fields with various wavenumbers. Both an imposed fully helical steady flow consisting of a pattern of screw-like motions (Roberts flow) and time-dependent statistically steady isotropic turbulence are considered. In the latter case the aforementioned evolution equations are solved simultaneously with the momentum and continuity equations. The corresponding results for the electromotive force are used to calculate alpha and magnetic diffusivity tensors. Results: For both the Roberts flow under the second--order correlation approximation and isotropic turbulence alpha and turbulent magnetic diffusivity are largest at large scales and these values diminish toward smaller scales. In both cases the alpha effect and turbulent diffusion kernels are well approximated by exponentials, corresponding to Lorentzian profiles in Fourier space. For isotropic turbulence the turbulent diffusion kernel is half as wide as the alpha effect kernel. For the Roberts flow beyond the second--order correlation approximation the turbulent diffusion kernel becomes negative at large scales.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 21:55:53 GMT" } ]
2008-04-30T00:00:00
[ [ "Brandenburg", "A.", "", "Nordita" ], [ "Rädler", "K. -H.", "", "Potsdam" ], [ "Schrinner", "M.", "", "MPI\n f. Sonnensystemforschung" ] ]
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801.1321
Anthony Piro
Anthony L. Piro, Philip Chang (UC Berkeley)
Convection during the Late Stages of Simmering in Type Ia Supernovae
Accepted for publication in The Astrophysical Journal, 7 pages, 3 figures
null
10.1086/529368
null
astro-ph
null
Following unstable ignition of carbon, but prior to explosion, a white dwarf (WD) in a Type Ia supernova (SN Ia) undergoes a simmering phase. During this time, a central convective region grows and encompasses ~1 Msun of the WD over a timescale of ~1000 yrs, which sets the thermal and turbulent profile for the subsequent explosion. We study this time-dependent convection and summarize some of the key features that differ from the traditional, steady-state case. We show that the long conductive timescale above the convective zone and the extraction of energy to heat the WD core leads to a decrease of the convective luminosity and characteristic velocities near the convective zone's top boundary. In addition, differences in the composition between the convective core and the conductive exterior will significantly alter the location of this boundary. In this respect, we find the biggest effect due to complete 22Ne sedimentation prior to carbon ignition. These effects add diversity to the possible WD models, which may alter the properties of the SN Ia explosion.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 21:09:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Piro", "Anthony L.", "", "UC Berkeley" ], [ "Chang", "Philip", "", "UC Berkeley" ] ]
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801.1322
Ralph Gardner-Chavis
Ralph A. Gardner-Chavis, John T. Reye, Theodore B. Selover Jr, Huixiong Zhang
Without Spectroscopy at the Beginning, Catalysis Research Proceeded in the Wrong Direction for More Than 100 Years
23 pages
null
null
null
physics.chem-ph
null
A study by infrared spectroscopy of the physisorbed region of catalysis demonstrated that the intermediates of catalysis exist on the surface as a two dimensional gas. Data in the Atomic Energy Level tables show that of the thousands of positive ions tabulated only approximately one hundred have the low-lying excited states that produce surface electric fields with a fractional charge. The specific catalyst for a reaction has the electric field with the fractional charge which when imparted to the two reactants changes the frequency of the fields at the sites of reaction on each so that they are harmonically equal, that is their ratio is a power of two. When the two reactants meet in the electric field of the catalyst resonance occurs. It is during resonance that electrons are shared, paired and exchanged and bonds are broken and made. This analysis of catalysis explains the most extraordinary observation that a catalyst is Not consumed when used because the catalyst is the electric fields. These discoveries are applied to explain such diverse reactions as the oxidation and chlorination of carbon monoxide and the destruction of nitric oxide in automobile exhaust. The use of electric fields to produce reactions may have application not only in chemistry but in biology and mechanics as well.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 21:13:38 GMT" } ]
2008-01-10T00:00:00
[ [ "Gardner-Chavis", "Ralph A.", "" ], [ "Reye", "John T.", "" ], [ "Selover", "Theodore B.", "Jr" ], [ "Zhang", "Huixiong", "" ] ]
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801.1323
Janne K. Viljas
J. K. Viljas, F. Pauly and J. C. Cuevas
Modeling elastic and photoassisted transport in organic molecular wires: length dependence and current-voltage characteristics
15 pages, 11 figures, minor corrections to old version
Phys. Rev. B 77, 155119 (2008)
10.1103/PhysRevB.77.155119
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a pi-orbital tight-binding model, we study the elastic and photoassisted transport properties of metal-molecule-metal junctions based on oligophenylenes of varying lengths. The effect of monochromatic light is modeled with an ac voltage over the contact. We first show how the low-bias transmission function can be obtained analytically, using methods previously employed for simpler chain models. In particular, the decay coefficient of the off-resonant transmission is extracted by considering both a finite-length chain and infinitely extended polyphenylene. Based on these analytical results, we discuss the length-dependence of the linear-response conductance, the thermopower, and the light-induced enhancement of the conductance in the limit of weak intensity and low frequency. In general the conductance-enhancement is calculated numerically as a function of the light frequency. Finally, we compute the current-voltage characteristics at finite dc voltages, and show that in the low-voltage regime, the effect of low-frequency light is to induce current steps with a voltage separation determined by twice the frequency. These effects are more pronounced for longer molecules. We study two different profiles for the dc and ac voltages, and it is found that the results are robust with respect to such variations. Although we concentrate here on the specific model of oligophenylenes, the results should be qualitatively similar for many other organic molecules with a large enough electronic gap.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 21:20:00 GMT" }, { "version": "v2", "created": "Thu, 17 Jul 2008 12:21:14 GMT" } ]
2009-05-24T00:00:00
[ [ "Viljas", "J. K.", "" ], [ "Pauly", "F.", "" ], [ "Cuevas", "J. C.", "" ] ]
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801.1324
Michael Crosser
M.S. Crosser, Jian Huang, F. Pierre, Pauli Virtanen, Tero T. Heikkil\"a, F. K. Wilhelm, and Norman O. Birge
Nonequilibrium transport in mesoscopic multi-terminal SNS Josephson junctions
16 pages, 17 figures
Phys. Rev. B 77, 014528 (2008)
10.1103/PhysRevB.77.014528
null
cond-mat.mes-hall
null
We report the results of several nonequilibrium experiments performed on superconducting/normal/superconducting (S/N/S) Josephson junctions containing either one or two extra terminals that connect to normal reservoirs. Currents injected into the junctions from the normal reservoirs induce changes in the electron energy distribution function, which can change the properties of the junction. A simple experiment performed on a 3-terminal sample demonstrates that quasiparticle current and supercurrent can coexist in the normal region of the S/N/S junction. When larger voltages are applied to the normal reservoir, the sign of the current-phase relation of the junction can be reversed, creating a "$\pi$-junction." We compare quantitatively the maximum critical currents obtained in 4-terminal $\pi$-junctions when the voltages on the normal reservoirs have the same or opposite sign with respect to the superconductors. We discuss the challenges involved in creating a "Zeeman" $\pi$-junction with a parallel applied magnetic field and show in detail how the orbital effect suppresses the critical current. Finally, when normal current and supercurrent are simultaneously present in the junction, the distribution function develops a spatially inhomogeneous component that can be interpreted as an effective temperature gradient across the junction, with a sign that is controllable by the supercurrent. Taken as a whole, these experiments illustrate the richness and complexity of S/N/S Josephson junctions in nonequilibrium situations.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 19:01:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Crosser", "M. S.", "" ], [ "Huang", "Jian", "" ], [ "Pierre", "F.", "" ], [ "Virtanen", "Pauli", "" ], [ "Heikkilä", "Tero T.", "" ], [ "Wilhelm", "F. K.", "" ], [ "Birge", "Norman O.", "" ] ]
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801.1325
Petar Mimica
Petar Mimica (1), Dimitrios Giannios (2), Miguel-Angel Aloy (1) ((1) Departamento de Astronomia y Astrofisica, Universidad de Valencia, (2) Max-Planck-Institut fuer Astrophysik)
An RMHD study of transition between prompt and afterglow GRB phases
10 pages, 3 figures, proceedings of the conference "Supernovae: lights in the darkness", October 3-5, 2007, Mao (Menorca)
PoS SUPERNOVA:021,2007
null
null
astro-ph
null
We study the afterglow phases of a GRB through relativistic magnetohydrodynamic simulations. The evolution of a relativistic shell propagating into a homogeneous external medium is followed. We focus on the effect of the magnetization of the ejecta on the initial phases of the ejecta-external medium interaction. In particular we are studying the condition for the existence of a reverse shock into the ejecta, the timescale for the transfer of the energy from the shell to the shocked medium and the resulting multiwavelength light curves. To this end, we have developed a novel scheme to include non-thermal processeses which is coupled to the relativistic magnetohydrodynamic code MRGENESIS in order to compute the non-thermal synchrotron radiation.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 17:34:01 GMT" } ]
2009-06-23T00:00:00
[ [ "Mimica", "Petar", "" ], [ "Giannios", "Dimitrios", "" ], [ "Aloy", "Miguel-Angel", "" ] ]
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801.1326
Elizaveta Shabalina
D0 collaboration, V. Abazov, et al
Simultaneous measurement of the ratio B(t->Wb)/B(t->Wq) and the top quark pair production cross section with the D0 detector at sqrt(s)=1.96 TeV
submitted to Phys.Rev.Letters
Phys.Rev.Lett.100:192003,2008
10.1103/PhysRevLett.100.192003
FERMILAB-PUB-08-010-E
hep-ex
null
We present the first simultaneous measurement of the ratio of branching fractions, R=B(t->Wb)/B(t->Wq), with q being a d, s, or b quark, and the top quark pair production cross section sigma_ttbar in the lepton plus jets channel using 0.9 fb-1 of ppbar collision data at sqrt(s)=1.96 TeV collected with the D0 detector. We extract R and sigma_ttbar by analyzing samples of events with 0, 1 and >= 2 identified b jets. We measure R = 0.97 +0.09-0.08 (stat+syst) and sigma_ttbar = 8.18 +0.90-0.84 (stat+syst)} +/-0.50 (lumi) pb, in agreement with the standard model prediction.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 21:57:41 GMT" } ]
2008-11-26T00:00:00
[ [ "D0 collaboration", "", "" ], [ "Abazov", "V.", "" ] ]
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801.1327
Mladen Georgiev
Mladen Georgiev
Famed Bulgarian physicists. I. St. Petroff's Goettingen research of the photostimulated interconversions of color centers in alkali halides: the discovery of the photostimulated aggregation
8 pages with 3 figures and 1 picture, all pdf format
null
null
null
physics.hist-ph physics.chem-ph
null
This essay tells briefly of the life and work of one of the most successful scientists originating from a Balkan settlement whose name and popularity have greatly exceeded its realm. The word is of a discovery during WWII of the photostimulated aggregation of the F centers (else alkali atoms) dissolved from the vapor into an alkali halide crystal. Using optical absorption techniques while a grantee of Humboldt's Foundation in Goettingen, Germany between 1943-1944, he found new absorption bands pertaining to small-size F center aggregates and followed their interconversions. A primary photochemical solid state reaction was evidenced for the first time leading to nanoscale products.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 21:57:52 GMT" } ]
2008-01-10T00:00:00
[ [ "Georgiev", "Mladen", "" ] ]
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801.1328
Dusa McDuff
Dusa McDuff
Monodromy in Hamiltonian Floer theory
34 pages, no figures; to appear in Commentarii Math. Helv; v4 corrects a small error in Prop 2.3
null
null
null
math.SG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Schwarz showed that when a closed symplectic manifold (M,\om) is symplectically aspherical (i.e. the symplectic form and the first Chern class vanish on \pi_2(M)) then the spectral invariants, which are initially defined on the universal cover of the Hamiltonian group, descend to the Hamiltonian group Ham (M,\om). In this note we describe less stringent conditions on the Chern class and quantum homology of M under which the (asymptotic) spectral invariants descend to Ham (M,\om). For example, they descend if the quantum multiplication of M is undeformed and H_2(M) has rank >1, or if the minimal Chern number is at least n+1 (where \dim M=2n) and the even cohomology of M is generated by divisors. The proofs are based on certain calculations of genus zero Gromov--Witten invariants. As an application, we show that the Hamiltonian group of the one point blow up of T^4 admits a Calabi quasimorphism. Moreover, whenever the (asymptotic) spectral invariants descend it is easy to see that Ham (M,\om) has infinite diameter in the Hofer norm. Hence our results establish the infinite diameter of Ham in many new cases. We also show that the area pseudonorm -- a geometric version of the Hofer norm -- is nontrivial on the (compactly supported) Hamiltonian group for all noncompact manifolds as well as for a large class of closed manifolds.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 22:06:04 GMT" }, { "version": "v2", "created": "Sun, 30 Mar 2008 14:39:14 GMT" }, { "version": "v3", "created": "Tue, 2 Dec 2008 20:39:52 GMT" }, { "version": "v4", "created": "Wed, 11 Nov 2009 13:55:07 GMT" }, { "version": "v5", "created": "Wed, 17 Feb 2010 14:56:48 GMT" } ]
2010-02-17T00:00:00
[ [ "McDuff", "Dusa", "" ] ]
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801.1329
Joseph Converse
Joseph M. Converse and Steven W. Stahler
The Distribution of Stellar Mass in the Pleiades
41 pages, 14 figures To Be Published in The Astrophysical Journal
null
10.1086/529431
null
astro-ph
null
As part of an effort to understand the origin of open clusters, we present a statistical analysis of the currently observed Pleiades. Starting with a photometric catalog of the cluster, we employ a maximum likelihood technique to determine the mass distribution of its members, including single stars and both components of binary systems. We find that the overall binary fraction for unresolved pairs is 68%. Extrapolating to include resolved systems, this fraction climbs to about 76%, significantly higher than the accepted field-star result. Both figures are sensitive to the cluster age, for which we have used the currently favored value of 125 Myr. The primary and secondary masses within binaries are correlated, in the sense that their ratios are closer to unity than under the hypothesis of random pairing. We map out the spatial variation of the cluster's projected and three-dimensional mass and number densities. Finally, we revisit the issue of mass segregation in the Pleiades. We find unambiguous evidence of segregation, and introduce a new method for quantifying it.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 22:33:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Converse", "Joseph M.", "" ], [ "Stahler", "Steven W.", "" ] ]
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801.133
Akhlesh Lakhtakia
A. Lakhtakia, J. A. Polo Jr., M. A. Motyka
Sculptured-thin-film plasmonic-polaritonics
6 pages
null
null
null
physics.optics
null
The solution of a boundary--value problem formulated for the Kretschmann configuration shows that the phase speed of a surface--plasmon--polariton (SPP) wave guided by the planar interface of a sufficiently thin metal film and a sculptured thin film (STF) depends on the vapor incidence angle used while fabricating the STF by physical vapor deposition. Furthermore, it may be possible to engineer the phase speed by periodically varying the vapor incidence angle. The phase speed of the SPP wave can be set by selecting higher mean value and/or the modulation amplitude of the vapor incidence angle.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 22:38:20 GMT" } ]
2008-01-10T00:00:00
[ [ "Lakhtakia", "A.", "" ], [ "Polo", "J. A.", "Jr." ], [ "Motyka", "M. A.", "" ] ]
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801.1331
Bojan Novakovic
Bojan Novakovic
Senenmut: An Ancient Egyptian Astronomer
to appear in Publication of Astronomical Observatory of Belgrade
null
null
null
astro-ph astro-ph.IM
null
The celestial phenomenon have always been a source of wonder and interest to people, even as long ago as the ancient Egyptians. While the ancient Egyptians did not know all the things about astronomy that we do now, they had a good understanding of the some celestial phenomenon. The achievements in astronomy of ancient Egyptians are relatively well known, but we know very little about the people who made these achievements. The goal of this paper is to bring some light on the life of Senenmut, the chief architect and astronomer during the reign of Queen Hatshepsut.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 22:42:42 GMT" } ]
2011-08-23T00:00:00
[ [ "Novakovic", "Bojan", "" ] ]
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801.1332
Kevin Wortman
Kai-Uwe Bux (Univ. of Virginia), Amir Mohammadi (Yale Univ.), Kevin Wortman (Univ. of Utah)
SL(n,Z[t]) is not FP_{n-1}
16 pages
null
null
null
math.GR
null
We prove the result from the title using the geometry of Euclidean buildings.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 23:19:35 GMT" } ]
2008-01-10T00:00:00
[ [ "Bux", "Kai-Uwe", "", "Univ. of Virginia" ], [ "Mohammadi", "Amir", "", "Yale Univ." ], [ "Wortman", "Kevin", "", "Univ. of Utah" ] ]
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801.1333
Tao Zhou
Runran Liu, Chunxiao Jia, Tao Zhou, Duo Sun, and Binghong Wang
Personal Recommendation via Modified Collaborative Filtering
7 pages, 8 figures and 1 table
Physica A 388 (2009) 462-468
10.1016/j.physa.2008.10.010
null
physics.data-an physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we propose a novel method to compute the similarity between congeneric nodes in bipartite networks. Different from the standard Person correlation, we take into account the influence of node's degree. Substituting this new definition of similarity for the standard Person correlation, we propose a modified collaborative filtering (MCF). Based on a benchmark database, we demonstrate the great improvement of algorithmic accuracy for both user-based MCF and object-based MCF.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 23:20:58 GMT" }, { "version": "v2", "created": "Thu, 3 Apr 2008 11:32:06 GMT" }, { "version": "v3", "created": "Fri, 11 Apr 2008 09:27:37 GMT" }, { "version": "v4", "created": "Sun, 27 Jul 2008 10:03:48 GMT" } ]
2008-12-12T00:00:00
[ [ "Liu", "Runran", "" ], [ "Jia", "Chunxiao", "" ], [ "Zhou", "Tao", "" ], [ "Sun", "Duo", "" ], [ "Wang", "Binghong", "" ] ]
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801.1334
Jonathan Feng
Jonathan L. Feng
Collider Physics and Cosmology
14 pages, plenary talk presented at the 18th International Conference on General Relativity and Gravitation (GRG18) and the 7th Edoardo Amaldi Conference on Gravitational Waves (Amaldi7), Sydney, Australia, 8-14 July 2007; published version
Class.Quant.Grav.25:114003,2008
10.1088/0264-9381/25/11/114003
UCI-TR-2008-2
gr-qc astro-ph.CO hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the coming year, the Large Hadron Collider will begin colliding protons at energies nearly an order of magnitude beyond the current frontier. The LHC will, of course, provide unprecedented opportunities to discover new particle physics. Less well-known, however, is that the LHC may also provide insights about gravity and the early universe. I review some of these connections, focusing on the topics of dark matter and dark energy, and highlight outstanding prospects for breakthroughs at the interface of particle physics and cosmology.
[ { "version": "v1", "created": "Tue, 8 Jan 2008 23:36:03 GMT" }, { "version": "v2", "created": "Sat, 12 Jul 2008 18:25:17 GMT" } ]
2009-08-12T00:00:00
[ [ "Feng", "Jonathan L.", "" ] ]
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801.1335
Max Souza
Fabio A. C. C. Chalub and Max O. Souza
A non-standard evolution problem arising in population genetics
16 pages. Proposition 4 statement and proof corrected. Also a number of typos has been fixed
Comm. Math. Sci., 7 (2), 489--502 (2009)
null
null
math.AP q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the evolution of the probability density of an asexual, one locus population under natural selection and random evolution. This evolution is governed by a Fokker-Planck equation with degenerate coefficients on the boundaries, supplemented by a pair of conservation laws. It is readily shown that no classical or standard weak solution definition yields solvability of the problem. We provide an appropriate definition of weak solution for the problem, for which we show existence and uniqueness. The solution displays a very distinctive structure and, for large time, we show convergence to a unique stationary solution that turns out to be a singular measure supported at the endpoints. An exponential rate of convergence to this steady state is also proved.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 13:21:47 GMT" }, { "version": "v2", "created": "Sun, 29 Mar 2009 23:07:29 GMT" } ]
2013-01-21T00:00:00
[ [ "Chalub", "Fabio A. C. C.", "" ], [ "Souza", "Max O.", "" ] ]
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801.1336
Subhash Kak
Subhash Kak
Stream Computing
7 pages, 4 figures
null
null
null
cs.AI
null
Stream computing is the use of multiple autonomic and parallel modules together with integrative processors at a higher level of abstraction to embody "intelligent" processing. The biological basis of this computing is sketched and the matter of learning is examined.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 14:59:31 GMT" } ]
2008-01-10T00:00:00
[ [ "Kak", "Subhash", "" ] ]
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801.1337
Jonathan W. Brundan
Jonathan Brundan, Simon M. Goodwin and Alexander Kleshchev
Highest weight theory for finite W-algebras
38 pages
Int. Math. Res. Notices 11 (2008), 53pp.
null
null
math.RT math.QA
null
We define analogues of Verma modules for finite W-algebras. By the usual ideas of highest weight theory, this is a first step towards the classification of finite dimensional irreducible modules. Motivated by known results in type A, we then formulate some precise conjectures in the case of nilpotent orbits of standard Levi type.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 00:28:21 GMT" } ]
2008-08-14T00:00:00
[ [ "Brundan", "Jonathan", "" ], [ "Goodwin", "Simon M.", "" ], [ "Kleshchev", "Alexander", "" ] ]
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801.1338
Kasso Okoudjou
Kasso A Okoudjou
A Beurling-Helson type theorem for modulation spaces
null
null
null
null
math.CA math.FA
null
We prove a Beurling-Helson type theorem on modulation spaces. More precisely, we show that the only $\mathcal{C}^{1}$ changes of variables that leave invariant the modulation spaces $\M{p,q}(\rd)$ are affine functions on $\rd$. A special case of our result involving the Sj\"ostrand algebra was considered earlier by A. Boulkhemair.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 00:35:10 GMT" } ]
2008-01-10T00:00:00
[ [ "Okoudjou", "Kasso A", "" ] ]
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801.1339
Michal Ostrowski
M. Ostrowski (Jagiellonian University)
Cosmic ray acceleration at relativistic shocks, shear layers, .
A talk given at "Jean-Pierre Lasota, X-ray binaries, accretion disks and compact stars" (October 2007); Abramowicz, M. Ed., New Astron. Rev., in press
null
null
null
astro-ph
null
A review of theoretical results on cosmic ray first-order Fermi acceleration at relativistic shock waves is presented, with recent results substantially changing the existing knowledge on these processes. In particular one can not expect such shocks to form particle distributions extending to very high energies. Instead, distributions with the shock compressed injected component followed by a more or less extended high energy tail are usually created. Increasing the shock Lorentz factor leads to steepening of the energetic tail. An observational check of real electron spectra in the Cyg A hot spots provides results clearly deviating from the standard expectations. The spectrum consist of a very flat low energy part (sigma ~1.5)up to electron energies ~1 GeV, and a much steeper part (sigma > 3)at higher energies. We conclude with remarks on the Fermi second-order processes acting in relativistic plasmas, possibly the main accelerating agent for very high energy cosmic rays.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 00:41:15 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 22:42:01 GMT" } ]
2011-11-10T00:00:00
[ [ "Ostrowski", "M.", "", "Jagiellonian University" ] ]
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801.134
Barry Madore
Barry F. Madore, Samuel Boissier, Armando Gil de Paz, Erica Nelson, and Kristen Petrillo
Spontaneous and Stimulated Star Formation in Galaxies
null
ASP Conf.Ser.374:455,2007
null
null
astro-ph
null
We present recent results from several on-going studies: The first addresses the question of gas-density thresholds for star formation, as probed by the outer disks of normal nearby galaxies. The second concerns the observational evidence for the existence of gravitating non-luminous (GNL) galaxies, as predicted by most recent simulations of galaxy formation in Lambda-CDM cosmologies. We find that (1) If star formation is traced by far-ultraviolet light, then there is no evidence for a threshold to star formation at any gas density so far probed, and (2) there is no evidence for GNL galaxies gravitationally interacting with known optical systems based on the observations (a) that there are no ring galaxies without plausible optically visible intruders, (b) all peculiar galaxies in the Arp Atlas that are bodily distorted have nearby plausibly interacting companions, and (c) there are no convincingly distorted/peculiar galaxies within Karachentsev's sample of more than 1,000 apparently/optically isolated galaxies.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 00:47:16 GMT" } ]
2009-06-25T00:00:00
[ [ "Madore", "Barry F.", "" ], [ "Boissier", "Samuel", "" ], [ "de Paz", "Armando Gil", "" ], [ "Nelson", "Erica", "" ], [ "Petrillo", "Kristen", "" ] ]
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801.1341
Sergey Tsarev P.
S.P. Tsarev
Factorization in categories of systems of linear partial differential equations
LaTeX, 23 pages
null
null
null
cs.SC
null
We start with elementary algebraic theory of factorization of linear ordinary differential equations developed in the period 1880-1930. After exposing these classical results we sketch more sophisticated algorithmic approaches developed in the last 20 years. The main part of this paper is devoted to modern generalizations of the notion of factorization to the case of systems of linear partial differential equations and their relation with explicit solvability of nonlinear partial differential equations based on some constructions from the theory of abelian categories.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 00:50:20 GMT" } ]
2008-01-10T00:00:00
[ [ "Tsarev", "S. P.", "" ] ]
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801.1342
Stefan C. Keller
Stefan C. Keller
Cepheid Mass-loss and the Pulsation -- Evolutionary Mass Discrepancy
15 pages, 3 figures, ApJ accepted
null
10.1086/529366
null
astro-ph
null
I investigate the discrepancy between the evolution and pulsation masses for Cepheid variables. A number of recent works have proposed that non-canonical mass-loss can account for the mass discrepancy. This mass-loss would be such that a 5Mo star loses approximately 20% of its mass by arriving at the Cepheid instability strip; a 14Mo star, none. Such findings would pose a serious challenge to our understanding of mass-loss. I revisit these results in light of the Padova stellar evolutionary models and find evolutionary masses are ($17\pm5$)% greater than pulsation masses for Cepheids between 5<M/Mo<14. I find that mild internal mixing in the main-sequence progenitor of the Cepheid are able to account for this mass discrepancy.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 01:06:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Keller", "Stefan C.", "" ] ]
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801.1343
Juha Vierinen
Juha Vierinen, Markku S. Lehtinen, Mikko Orispaa, Ilkka I. Virtanen
Transmission code optimization method for incoherent scatter radar
Submitted to Annales Geophysicae
null
10.5194/angeo-26-2923-2008
null
physics.data-an physics.space-ph
null
When statistical inversion of a lag profile is used to determine an incoherent scatter target, the posterior variance of the estimated target can be used to determine how well a certain set of transmission codes perform. In this work we present an incoherent scatter radar transmission code optimization search method suitable for different modulation types, including binary phase, polyphase and amplitude modulation. We find that the combination of amplitude and phase modulation provides better performance than traditional binary phase coding, in some cases giving better accuracy than alternating codes.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 01:18:58 GMT" } ]
2015-05-13T00:00:00
[ [ "Vierinen", "Juha", "" ], [ "Lehtinen", "Markku S.", "" ], [ "Orispaa", "Mikko", "" ], [ "Virtanen", "Ilkka I.", "" ] ]
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801.1344
Ralf Meyer
Ralf Meyer
Homological algebra in bivariant K-theory and other triangulated categories. II
Final version. Rearranged some results, so that section and theorem numbers are changed compared to v1 and v2
Tbil. Math. J. 1 (2008), pp. 165-210
null
null
math.KT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use homological ideals in triangulated categories to get a sufficient criterion for a pair of subcategories in a triangulated category to be complementary. We apply this criterion to construct the Baum-Connes assembly map for locally compact groups and torsion-free discrete quantum groups. Our methods are related to the abstract version of the Adams spectral sequence by Brinkmann and Christensen.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 19:33:24 GMT" }, { "version": "v2", "created": "Fri, 23 May 2008 14:11:28 GMT" }, { "version": "v3", "created": "Fri, 12 Dec 2008 10:07:50 GMT" } ]
2015-10-23T00:00:00
[ [ "Meyer", "Ralf", "" ] ]
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801.1345
Paul Langacker
Paul Langacker
The Physics of Heavy Z' Gauge Bosons
31 pages, 2 figures, final version for Rev. Mod. Phys., reformatted, references updated and added, minor changes
Rev.Mod.Phys.81:1199-1228,2009
10.1103/RevModPhys.81.1199
null
hep-ph hep-ex hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The U(1)' symmetry associated with a possible heavy Z' would have profound implications for particle physics and cosmology. The motivations for such particles in various extensions of the standard model, possible ranges for their masses and couplings, and classes of anomaly-free models are discussed. Present limits from electroweak and collider experiments are briefly surveyed, as are prospects for discovery and diagnostic study at future colliders. Implications of a Z' are discussed, including an extended Higgs sector, extended neutralino sector, and solution to the mu problem in supersymmetry; exotic fermions needed for anomaly cancellation; possible flavor changing neutral current effects; neutrino mass; possible Z' mediation of supersymmetry breaking; and cosmological implications for cold dark matter and electroweak baryogenesis.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 20:35:23 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 17:06:34 GMT" }, { "version": "v3", "created": "Mon, 30 Nov 2009 21:09:28 GMT" } ]
2014-11-18T00:00:00
[ [ "Langacker", "Paul", "" ] ]
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801.1346
Luigi Bedin Rolly
L. R. Bedin (1), I. R. King (2), J. Anderson (1), G. Piotto (3), M. Salaris (4), S. Cassisi (5), A. Serenelli (6) ((1) STScI, (2) Univ. of Washington Seattle, (3) Univ. Padova, (4) J. Moores Univ. Liverpool, (5) INAF-Obs. Teramo, (6) IAS Princeton)
Reaching the End of the White Dwarf Cooling Sequence in NGC 6791
29 pages, 10 figures (4 in low resolution), 1 table. Accepted (2007 December 19) on ApJ
null
10.1086/529370
null
astro-ph
null
We present new observations of the white dwarf sequence of the old open cluster NGC 6791. The brighter peak previously observed in the white dwarf luminosity function (WDLF) is now better delineated, and the second, fainter peak that we suggested earlier is now confirmed. A careful study suggests that we have reached the end of the white dwarf sequence. The WDs that create the two peaks in the WDLF show a significant turn to the blue in the color-magnitude diagram. The discrepancy between the age from the WDs and that from the main sequence turnoff remains, and we have an additional puzzle in the second peak in the WDLF. Canonical WD models seem to fail --at least at ~25%-level-- in reproducing the age of clusters of this metallicity. We discuss briefly possible ways of arriving at a theoretical understanding of the WDLF.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 02:05:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Bedin", "L. R.", "" ], [ "King", "I. R.", "" ], [ "Anderson", "J.", "" ], [ "Piotto", "G.", "" ], [ "Salaris", "M.", "" ], [ "Cassisi", "S.", "" ], [ "Serenelli", "A.", "" ] ]
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801.1347
Xiaoning Wu
Xiaoning Wu, Chao-Guang Huang and Jia-Rui Sun
On Gravitational anomaly and Hawking radiation near weakly isolated horizon
14 pages
Phys.Rev.D77:124023,2008
10.1103/PhysRevD.77.124023
null
gr-qc
null
Based on the idea of the work by Wilczek and his collaborators, we consider the gravitational anomaly near weekly isolated horizon. We find that there exists a universal choice of tortoise coordinate for any weakly isolated horizon. Under this coordinate, the leading behavior of a quite arbitrary scalar field near horizon is a 2-dimensional chiral scalar field. This means we can extend the idea of Wilczek and his collaborators to more general cases and show the relation between gravitational anomaly and Hawking radiation is a universal property of black hole horizon.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 02:12:49 GMT" } ]
2008-11-26T00:00:00
[ [ "Wu", "Xiaoning", "" ], [ "Huang", "Chao-Guang", "" ], [ "Sun", "Jia-Rui", "" ] ]
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801.1348
Louis-Francois Arsenault
Louis-Fran\c{c}ois Arsenault and B. Movaghar
Hall conductivity in the presence of spin-orbit interaction and disorder
Accepted for publication in Physical Review B
Phys. Rev. B 78, 214408 (2008)
10.1103/PhysRevB.78.214408
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Starting from the Kubo formula, we expand the Hall conductivity using a cumulant approach which converges quickly at high temperatures (k_BT > energy differences of initial and final scattering states) and can be extended to low temperatures. The theory can deal with the sign, the ordinary and the anomalous contributions to the Hall effect. When applied to include the spin-orbit interaction to first order, we recover what is essentially the Karplus-Luttinger result for the anomalous Hall effect. Contact is made to the Chazalviel and Nozieres-Lewiner formulae. A side-jump type formula is obtained by using an exact application of linear response. We show that there exists an exact rigid Hall current which is not a Fermi level property. We introduce a relationship between mass and diffusivity which allows us to generalize the theory to strong disorder and even introduce a mobility edge. The formalism provides a systematic and practical way of analyzing both ordinary and anomalous contributions to the Hall conduction including the changes of sign, and in the presence of serious disorder. As a byproduct of the method, we show that the anomalous Hall coefficient can vary with resistance to the power n, with 1 <= n <= 2 depending on the degree of coherence.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 02:13:24 GMT" }, { "version": "v2", "created": "Wed, 9 Jul 2008 05:51:19 GMT" }, { "version": "v3", "created": "Thu, 30 Oct 2008 03:56:30 GMT" } ]
2013-10-18T00:00:00
[ [ "Arsenault", "Louis-François", "" ], [ "Movaghar", "B.", "" ] ]
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801.1349
Piotr Szymczak
T. Gubiec and P. Szymczak
Fingered growth in channel geometry: A Loewner equation approach
null
null
10.1103/PhysRevE.77.041602
null
cond-mat.stat-mech math-ph math.MP
null
A simple model of Laplacian growth is considered, in which the growth takes place only at the tips of long, thin fingers. In a recent paper, Carleson and Makarov used the deterministic Loewner equation to describe the evolution of such a system. We extend their approach to a channel geometry and show that the presence of the side walls has a significant influence on the evolution of the fingers and the dynamics of the screening process, in which longer fingers suppress the growth of the shorter ones.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 03:10:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Gubiec", "T.", "" ], [ "Szymczak", "P.", "" ] ]
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801.135
Rongwei Hu
Rongwei Hu, V. F. Mitrovic, and C. Petrovic
Anisotropy in magnetic and transport properties of Fe1-xCoxSb2
7 pages, 6 figures
PHYSICAL REVIEW B 74 (19): 195130 (2006)
10.1103/PhysRevB.74.195130
null
cond-mat.str-el cond-mat.mtrl-sci
null
Anisotropic magnetic and electronic transport measurements were carried out on large single crystals of Fe1-xCoxSb2 (0<= x <=1). The semiconducting state of FeSb2 evolves into metallic and weakly ferromagnetic by substitution of Fe with Co for x<0.5. Further doping induces structural transformation from orthorhombic Pnnm structure of FeSb2 to monoclinic P21/c structure of CoSb2 where semiconducting and diamagnetic ground state is restored again. Large magnetoresistance and anisotropy in electronic transport were observed.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 02:50:51 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 03:41:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Hu", "Rongwei", "" ], [ "Mitrovic", "V. F.", "" ], [ "Petrovic", "C.", "" ] ]
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801.1351
Rongwei Hu
Rongwei Hu, V. F. Mitrovic, and C. Petrovic
Anisotropy in the magnetic and electrical transport properties of Fe1-xCrxSb2
5 pages, 6 figures
PHYSICAL REVIEW B 76 (11): Art. No. 115105 SEP 2007
10.1103/PhysRevB.76.115105
null
cond-mat.str-el cond-mat.mtrl-sci
null
We have investigated anisotropy in magnetic and electrical transport properties of Fe1-xCrxSb2 (0<= x <=1) single crystals. The magnetic ground state of the system evolves from paramagnetic to antiferromagnetic with gradual substitution of Fe with Cr. Anisotropy in electrical transport diminishes with increased Cr substitution and fades away by x=0.5. We find that the variable range hopping (VRH) conduction mechanism dominates at low temperatures for 0.4<= x <=0.75.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 03:07:10 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 03:45:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Hu", "Rongwei", "" ], [ "Mitrovic", "V. F.", "" ], [ "Petrovic", "C.", "" ] ]
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801.1352
J. A. Lopez
M. T. Garcia-Diaz, J. A. L\'opez, G. Garcia-Segura, M. G. Richer and W. Steffen
The planetary nebula NGC 1360, a test case of magnetic collimation and evolution after the fast wind
16 pages, 7 figures. ApJ in press
null
10.1086/527468
null
astro-ph
null
The central star of this nebula has an observed intense magnetic field and the fast wind is no longer present, indicating that a back flow process has probably developed. Long-slit, spatially resolved echelle spectra have been obtained across the main body of NGC 1360 and over its system of bipolar jets. Deep images of the knotty structures of the jets have also been obtained. The data allow a detailed study of the structure and kinematics of this object and the results are modeled considering the effects of a magnetic collimation process in the development of the nebula and then switching off the fast stellar wind to follow its evolution to its current state. The model is able to successfully reproduce many of the key features of NGC 1360 under these premises.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 03:10:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Garcia-Diaz", "M. T.", "" ], [ "López", "J. A.", "" ], [ "Garcia-Segura", "G.", "" ], [ "Richer", "M. G.", "" ], [ "Steffen", "W.", "" ] ]
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801.1353
Hiromichi Ohno
Hiromichi Ohno
Quasi-orthogonal subalgebras of matrix algebras
12pages
null
null
null
math.OA math-ph math.MP
null
We investigate pairwise quasi-orthogonal subalgebras in $M_{p^{kn}}$ which are isomorphic to $M_{p^{k}}$ for $k \ge 1$, $n \ge 2$ and a prime number $p$ with $p \ge 3$. We prove there exist $p^{2kn}-1/p^{2k}-1$ such subalgebras and they span $M_{p^{kn}}$.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 03:37:02 GMT" } ]
2008-01-10T00:00:00
[ [ "Ohno", "Hiromichi", "" ] ]
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801.1354
Rongwei Hu
Rongwei Hu, K. J. Thomas, Y. Lee, T. Vogt, E. S. Choi, V. F. Mitrovic, R. P. Hermann, F. Grandjean, P. C. Canfield, J. W. Kim, A. I. Goldman and C. Petrovic
Colossal Positive Magnetoresistance in a Doped Nearly Magnetic Semiconductor
5 pages, 5 figures
null
10.1103/PhysRevB.77.085212
null
cond-mat.str-el cond-mat.mtrl-sci
null
We report on a positive colossal magnetoresistance (MR) induced by metallization of FeSb$_{2}$, a nearly magnetic or "Kondo" semiconductor with 3d ions. We discuss contribution of orbital MR and quantum interference to enhanced magnetic field response of electrical resistivity.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 03:37:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Hu", "Rongwei", "" ], [ "Thomas", "K. J.", "" ], [ "Lee", "Y.", "" ], [ "Vogt", "T.", "" ], [ "Choi", "E. S.", "" ], [ "Mitrovic", "V. F.", "" ], [ "Hermann", "R. P.", "" ], [ "Grandjean", "F.", "" ], [ "Canfield", "P. C.", "" ], [ "Kim", "J. W.", "" ], [ "Goldman", "A. I.", "" ], [ "Petrovic", "C.", "" ] ]
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801.1355
Jun Hayakawa
Jun Hayakawa, Shoji Ikeda, Katsuya Miura, Michihiko Yamanouchi, Young Min Lee, Ryutaro Sasaki, Masahiko Ichimura, Kenchi Ito, Takayuki Kawahara, Riichiro Takemura, Toshiyasu Meguro, Fumihiro Matsukura, Hiromasa Takahashi, Hideyuki Matsuoka, and Hideo Ohno
Current-induced magnetization switching in MgO barrier magnetic tunnel junctions with CoFeB based synthetic ferrimagnetic free layers
6 pages
null
10.1109/TMAG.2008.924545
null
cond-mat.mtrl-sci
null
We investigated the effect of using a synthetic ferrimagnetic (SyF) free layer in MgO-based magnetic tunnel junctions (MTJs) on current-induced magnetization switching (CIMS), particularly for application to spin-transfer torque random access memory (SPRAM). The employed SyF free layer had a Co40Fe40B20/ Ru/ Co40Fe40B20 and Co20Fe60B20/Ru/Co20Fe60B20 structures, and the MTJs(100x(150-300) nm^2) were annealed at 300oC. The use of SyF free layer resulted in low intrinsic critical current density (Jc0) without degrading the thermal-stability factor (E/kBT, where E, kB, and T are the energy potential, the Boltzmann constant, and temperature,respectively). When the two CoFeB layers of a strongly antiferromagnetically coupled SyF free layer had the same thickness, Jc0 was reduced to 2-4x10^6 A/cm^2. This low Jc0 may be due to the decreased effective volume under the large spin accumulation at the CoFeB/Ru. The E/kBT was over 60, resulting in a retention time of over ten years and suppression of the write current dispersion for SPRAM. The use of the SyF free layer also resulted in a bistable (parallel/antiparallel) magnetization configuration at zero field, enabling the realization of CIMS without the need to apply external fields to compensate for the offset field.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 04:40:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Hayakawa", "Jun", "" ], [ "Ikeda", "Shoji", "" ], [ "Miura", "Katsuya", "" ], [ "Yamanouchi", "Michihiko", "" ], [ "Lee", "Young Min", "" ], [ "Sasaki", "Ryutaro", "" ], [ "Ichimura", "Masahiko", "" ], [ "Ito", "Kenchi", "" ], [ "Kawahara", "Takayuki", "" ], [ "Takemura", "Riichiro", "" ], [ "Meguro", "Toshiyasu", "" ], [ "Matsukura", "Fumihiro", "" ], [ "Takahashi", "Hiromasa", "" ], [ "Matsuoka", "Hideyuki", "" ], [ "Ohno", "Hideo", "" ] ]
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801.1356
Romyar Sharifi
Romyar T. Sharifi
Cup products and L-values of cusp forms
9 pages
Pure Appl. Math. Quart. 5 (2009) 339-348
null
null
math.NT
null
In this note, we describe a conjecture, that, for an odd prime p, relates special values of a cup product pairing on cyclotomic p-units in the pth cyclotomic field to the L-values of newforms satisfying modulo p congruences with Eisenstein series.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 05:09:12 GMT" } ]
2008-07-30T00:00:00
[ [ "Sharifi", "Romyar T.", "" ] ]
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801.1357
Weidong Liu
Zhengyan Lin, Weidong Liu
On maxima of periodograms of stationary processes
The constant A_n in Lemma 4.2 on page 23 (Supplementary Material) is corrected. Other context remains the same
null
null
null
math.ST math.PR stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the limit distribution of maxima of periodograms for stationary processes. Our method is based on $m$-dependent approximation for stationary processes and a moderate deviation result.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 06:32:56 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 09:56:45 GMT" }, { "version": "v3", "created": "Mon, 10 Aug 2009 15:47:46 GMT" }, { "version": "v4", "created": "Tue, 11 Aug 2009 05:44:08 GMT" } ]
2009-08-11T00:00:00
[ [ "Lin", "Zhengyan", "" ], [ "Liu", "Weidong", "" ] ]
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801.1358
Bartosz Lew
B.S. Lew, B.F. Roukema
A test of the Poincare dodecahedral space topology hypothesis with the WMAP CMB data
8 pages, 6 figures, typo corrected/replaced to match version published in A&A
A&A 482, 747-753 (2008)
10.1051/0004-6361:20078777
null
astro-ph
null
It has been suggested by Roukema and coworkers (hereafter R04) that the topology of the Universe as probed by the ``matched circles'' method using the first year release of the WMAP CMB data, might be that of the Poincar\'e dodecahedral space (PDS) model. An excess in the correlation of the ``identified circles'' was reported by R04, for circles of angular radius of ~11 deg for a relative phase twist -36deg, hinting that this could be due to a Clifford translation, if the hypothesized model were true. R04 did not however specify the statistical significance of the correlation signal. We investigate the statistical significance of the signal using Monte Carlo CMB simulations in a simply connected Universe, and present an updated analysis using the three-year WMAP data. We find that our analyses of the first and three year WMAP data provide results that are consistent with the simply connected space at a confidence level as low as 68%.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 05:42:38 GMT" }, { "version": "v2", "created": "Thu, 24 Apr 2008 13:16:11 GMT" } ]
2008-04-24T00:00:00
[ [ "Lew", "B. S.", "" ], [ "Roukema", "B. F.", "" ] ]
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801.1359
Jing-Ling Chen
Fu-Lin Zhang, and Jing-Ling Chen
Non-standard Schwinger fermionic representation of unitary group
4 pages
International Journal of Theoretical Physics 48, 414-421 (2009)
10.1007/s10773-008-9816-9
null
quant-ph
null
The non-standard Schwinger fermionic representation of the unitary group is studied by using $n$-fermion operators. One finds that the Schwinger fermionic representation of the U(n) group is not unique when $n\ge 3$. In general, based on $n$-fermion operators, the non-standard Schwinger fermionic representation of the U(n) group can be established in a uniform approach, where all the generators commute with the total number operators. The Schwinger fermionic representation of $U(C^{m}_{n})$ group is also discussed.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 05:22:46 GMT" } ]
2011-03-10T00:00:00
[ [ "Zhang", "Fu-Lin", "" ], [ "Chen", "Jing-Ling", "" ] ]
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801.136
Romyar Sharifi
Romyar T. Sharifi
On Galois groups of unramified pro-p extensions
14 pages: substantial revisions, final version, to appear in Math. Ann
Math. Ann. 342 (2008) 297-308
null
null
math.NT
null
Let p be an odd prime satisfying Vandiver's conjecture. We consider two objects, the Galois group X of the maximal unramified abelian pro-p extension of the compositum of all Z_p-extensions of the pth cyclotomic field and the Galois group G of the unramified pro-p extension of the cyclotomic field of all p-power roots of unity. We give a lower bound for the height of the annihilator of X as an Iwasawa module. Under some mild assumptions on Bernoulli numbers, we provide a necessary and sufficient condition for G to be abelian. The bound and the condition in the two results are given in terms of the special values of a cup product pairing on cyclotomic p-units. We obtain, in particular, that for p less than 1000, Greenberg's conjecture on the pseudo-nullity of X holds and G is in fact abelian.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 05:24:33 GMT" }, { "version": "v2", "created": "Wed, 21 May 2008 03:28:41 GMT" } ]
2008-07-30T00:00:00
[ [ "Sharifi", "Romyar T.", "" ] ]
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801.1361
Manabu Hagiwara
Manabu Hagiwara and Hideki Imai
On the non-existence for quantum LDPC codes of type IEEE802.16e with rates 1/2 and 2/3B
4 pages
null
null
null
quant-ph
null
In this paper, we discuss a construction of CSS codes derived from pairs of practical irregular LDPC codes. Our design of irregular LDPC codes is based the design written in the standardization of IEEE802.16e. Our research has tried to make a CSS code with a pair of LDPC codes of type IEEE802.16e. To our regret, we proved that it was impossible to construct a CSS code if one of classical codes was of type IEEE802.16e with rate 1/2 and 2/3B. We would like to report the discussion on its impossibility in this paper. This is the first paper to analyze the possibility of a CSS code construction by using two irregular LDPC codes which are practically useful.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 05:46:02 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 09:30:13 GMT" } ]
2011-11-10T00:00:00
[ [ "Hagiwara", "Manabu", "" ], [ "Imai", "Hideki", "" ] ]
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801.1362
An-Ping Li
An-Ping Li
A new key exchange cryptosystem
A revision
null
null
null
cs.CR
null
In this paper, we will present a new key exchange cryptosystem based on linear algebra, which take less operations but weaker in security than Diffie-Hellman's one.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 11:16:25 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 01:34:15 GMT" }, { "version": "v3", "created": "Sun, 20 Jan 2008 07:15:00 GMT" } ]
2008-01-20T00:00:00
[ [ "Li", "An-Ping", "" ] ]
[ -0.0137705039, -0.0535096899, -0.0040829671, 0.0050656688, 0.0741020441, 0.0070691123, -0.0449633561, 0.0906367972, -0.0534082502, -0.0787175745, 0.0189693123, -0.0802391768, -0.1275102943, 0.0077791931, 0.0440757535, -0.0863255858, -0.0030955102, -0.0634508282, -0.0043365676, -0.0587845817, -0.0260447636, 0.0046694181, 0.1057006568, 0.0432135127, 0.0771959722, -0.0050593289, 0.0312689319, -0.0662404299, 0.0699937195, -0.0573136993, 0.0143918246, -0.0477529615, 0.05345897, -0.0706530809, -0.0228113588, 0.1009836942, -0.0324862152, 0.0311167724, -0.077043809, -0.0106955981, 0.0384965464, -0.0745585263, -0.0560456961, -0.0280735679, 0.0326890945, 0.0167376287, -0.0212643966, -0.0272874068, -0.0213404763, 0.0000839061, -0.074355647, 0.0809999779, 0.0406775102, -0.0240540002, -0.0270338058, -0.0109365182, -0.0195145532, -0.0634001046, 0.0483108833, 0.0535096899, 0.0340331793, -0.0808985382, 0.0213911962, 0.0886587128, -0.0624364279, -0.0107653383, -0.1141201928, 0.0388515852, 0.0581252202, -0.0128765618, -0.101541616, -0.031497173, -0.0280228481, 0.0399674289, -0.0467892811, 0.0754714906, -0.1331909448, 0.0458763167, 0.0902310312, 0.0740006045, 0.0097953165, 0.0020272185, -0.021175636, 0.0122108608, 0.0519373678, -0.1016937718, -0.0948972851, 0.0575672984, -0.0551327355, -0.1184821203, 0.049731046, -0.0583280995, 0.0321311764, 0.0210488364, 0.127307415, 0.0795290992, 0.011373979, 0.0557413734, -0.0878471881, 0.0731383637, -0.023293199, -0.0602047443, 0.0418947898, 0.0605597831, 0.1048891395, 0.0621321052, 0.0141382245, 0.0086224144, -0.1327851862, 0.0818115026, -0.1604783535, -0.0526981689, -0.0846011043, -0.0424527116, 0.0263998043, -0.0596975423, 0.0196793936, -0.0655810684, 0.0384204648, 0.0121347811, -0.0232171193, 0.0060356902, 0.0985491276, -0.0411086306, 0.1061064228, -0.0921583995, -0.0118304603, -0.1251771748, -0.0969768018, -0.002906895, 0.109251067, -0.0345403776, 0.100831531, 0.0522924103, -0.0811521411, 0.0606612228, 0.0245358422, 0.0669505149, 0.0684213936, -0.1409004033, 0.1247714162, -0.1342053562, -0.0105624581, 0.0507961661, -0.0866299048, 0.036822781, -0.0734934062, -0.0217589177, -0.0334245376, 0.0022617988, 0.0156851877, -0.0466371179, 0.0116592795, 0.1500300169, -0.0373553447, -0.02908797, -0.0103151975, -0.0117100002, 0.0424780734, 0.0339317396, -0.0332470164, 0.1125985906, -0.0984984115, 0.0065936111, -0.0386233442, 0.0098713972, 0.0545748137, -0.0667476356, -0.0920062363, -0.0433656722, -0.0288850889, -0.1004257724, -0.0161923878, 0.0552341752, -0.0082610343, 0.0102517977, -0.032511577, -0.1169605181, -0.0349968597, 0.0113422796, -0.042883832, 0.1372485608, 0.0805942193, -0.0070564318, -0.0110316193, -0.00287995, 0.1316693425, 0.035174381, -0.0073861126, 0.0579730608, -0.0570093766, 0.12659733, 0.0042699971, -0.0282510873, 0.0770945325, -0.0684213936, -0.0258292034, 0.0115388194, 0.0149751054, -0.0680663586, -0.0128131621, -0.0546255335, 0.0219237581, -0.0145186251, -0.0388008654, -0.0463074408, 0.0539154522, -0.0150385052, -0.0575165786, -0.0507454462, 0.0181958303, 0.025905285, 0.0868835077, -0.0634001046, -0.0146707846, 0.091803357, 0.0159514677, 0.0183987115, 0.0342106968, 0.0822679773, -0.0916511938, 0.0300262906, 0.0672041178, 0.0892673507, 0.0311421324, 0.0494774431, 0.0500607267, -0.0783118159, 0.0234200004, -0.1061064228, 0.0564514548, -0.0361634232, -0.073341243, -0.0566543378, 0.0058232998, -0.0024741893, -0.047068242, -0.0372285433, -0.1036718562, -0.0338049382, -0.0948465616, 0.0144552244, -0.0034014159, 0.0190453921, -0.1512472928, 0.0627914667, -0.0577701777, -0.0319029354, -0.0258292034, -0.0597482622, -0.0507200882, 0.117264837, 0.04184407, -0.0400942266, -0.0381161459, -0.0088886954 ]
801.1363
Huaiyu Duan
Huaiyu Duan, George M. Fuller, Yong-Zhong Qian
Stepwise Spectral Swapping with Three Neutrino Flavors
13 pages, 1 figure. References updated
Phys.Rev.D77:085016,2008
10.1103/PhysRevD.77.085016
INT PUB 08-01
astro-ph hep-ph
null
We develop a framework for studying collective three-flavor neutrino oscillations based on the density matrix formalism. We show how techniques proven useful for collective two-flavor neutrino oscillations such as corotating frames can be applied readily to three-flavor mixing. Applying two simple assumptions and the conservation of two ``lepton numbers'' we use this framework to demonstrate how the adiabatic/precession solution emerges. We illustrate with a numerical example how two stepwise spectral swaps appear naturally if the flavor evolution of the neutrino gas can be described by such a solution. For the special case where mu and tau flavor neutrinos are equally mixed and are produced with identical energy spectra and total numbers, we find that one of the spectral swaps in the three-flavor scenario agrees with that in the two-flavor scenario when appropriate mixing parameters are used. Using the corotating frame technique we show how the adiabatic/precession solution can obtain even in the presence of a dominant ordinary matter background. With this solution we can explain why neutrino spectral swapping can be sensitive to deviations from maximal 23-mixing when the ``mu-tau'' matter term is significant.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 19:02:58 GMT" }, { "version": "v2", "created": "Mon, 21 Apr 2008 14:07:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Duan", "Huaiyu", "" ], [ "Fuller", "George M.", "" ], [ "Qian", "Yong-Zhong", "" ] ]
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801.1364
Robert McKilliam
Robby G. McKilliam, I. Vaughan L. Clarkson, Barry G. Quinn
An Algorithm to Compute the Nearest Point in the Lattice $A_{n}^*$
3 pages
IEEE Transactions on Information Theory, Vol. 54, No. 9, pp 4378-4381, Sept. 2008
10.1109/TIT.2008.928280
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The lattice $A_n^*$ is an important lattice because of its covering properties in low dimensions. Clarkson \cite{Clarkson1999:Anstar} described an algorithm to compute the nearest lattice point in $A_n^*$ that requires $O(n\log{n})$ arithmetic operations. In this paper, we describe a new algorithm. While the complexity is still $O(n\log{n})$, it is significantly simpler to describe and verify. In practice, we find that the new algorithm also runs faster.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 07:08:56 GMT" }, { "version": "v2", "created": "Tue, 30 Sep 2008 03:28:27 GMT" } ]
2008-09-30T00:00:00
[ [ "McKilliam", "Robby G.", "" ], [ "Clarkson", "I. Vaughan L.", "" ], [ "Quinn", "Barry G.", "" ] ]
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801.1365
Nirvikar Prasad
Nirvikar Prasad
Formation Scenario of Magnetars: The Puzzle of Isolation
Prepared for the conference "40 Years of Pulsars: Millisecond Pulsars, Magnetars, and More", August 12-17, 2007, McGill University, Montreal, Canada
null
null
null
astro-ph
null
Magnetars (SGRs and AXPs) are one of the most evolutionary paths of a neutron star. These objects have an ultra-strong magnetic field $B \sim 10^{15}$ G at their surface and show persistent X-ray pulsations and transient bursts. Till date there are 14 magnetars known: 5 SGRs (4 confirmed, 1 candidate) and 9 AXPs (7 confirmed, 2 candidates). It is an open puzzle that all these objects are isolated and none have been found in binaries. We discuss the formation scenario which can lead to such a situation.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 06:51:21 GMT" } ]
2008-01-10T00:00:00
[ [ "Prasad", "Nirvikar", "" ] ]
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801.1366
Masoud Alimohammadi
M. Alimohammadi and A. A. Baghjary
Klein-Gordon and Dirac particles in non-constant scalar-curvature background
14 pages, LaTeX, to be published in Int. Jour. Mod. Phys. A
Int.J.Mod.Phys.A23:1613-1626,2008
10.1142/S0217751X08039463
null
gr-qc
null
The Klein-Gordon and Dirac equations are considered in a semi-infinite lab ($x > 0$) in the presence of background metrics $ds^2 =u^2(x) \eta_{\mu\nu} dx^\mu dx^\nu$ and $ds^2=-dt^2+u^2(x)\eta_{ij}dx^i dx^j$ with $u(x)=e^{\pm gx}$. These metrics have non-constant scalar-curvatures. Various aspects of the solutions are studied. For the first metric with $u(x)=e^{gx}$, it is shown that the spectrums are discrete, with the ground state energy $E^2_{min}=p^2c^2 + g^2c^2\hbar^2$ for spin-0 particles. For $u(x)=e^{-gx}$, the spectrums are found to be continuous. For the second metric with $u(x)=e^{-gx}$, each particle, depends on its transverse-momentum, can have continuous or discrete spectrum. For Klein-Gordon particles, this threshold transverse-momentum is $\sqrt{3}g/2$, while for Dirac particles it is $g/2$. There is no solution for $u(x)=e^{gx}$ case. Some geometrical properties of these metrics are also discussed.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 07:11:48 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 10:01:18 GMT" } ]
2008-11-26T00:00:00
[ [ "Alimohammadi", "M.", "" ], [ "Baghjary", "A. A.", "" ] ]
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801.1367
Jean-Francois Jaulent
Jean-Fran\c{c}ois Jaulent (IMB), Sebastian Pauli (DMS), Michael Pohst, Florence Soriano-Gafiuk (LMAM)
Computation of 2-groups of positive classes of exceptional number fields
null
null
null
null
math.NT
null
We present an algorithm for computing the 2-group of the positive divisor classes of a number field F in case F has exceptional dyadic places. As an application, we compute the 2-rank of the wild kernel WK2(F) in K2(F) for such number fields.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 07:52:45 GMT" } ]
2008-01-10T00:00:00
[ [ "Jaulent", "Jean-François", "", "IMB" ], [ "Pauli", "Sebastian", "", "DMS" ], [ "Pohst", "Michael", "", "LMAM" ], [ "Soriano-Gafiuk", "Florence", "", "LMAM" ] ]
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801.1368
Makiko Nagasawa
M. Nagasawa, S. Ida, and T. Bessho
Formation of Hot Planets by a combination of planet scattering, tidal circularization, and Kozai mechanism
15 pages, 16 figures, Accepted for publication in ApJ
null
10.1086/529369
null
astro-ph
null
We have investigated the formation of close-in extrasolar giant planets through a coupling effect of mutual scattering, Kozai mechanism, and tidal circularization, by orbital integrations. We have carried out orbital integrations of three planets with Jupiter-mass, directly including the effect of tidal circularization. We have found that in about 30% runs close-in planets are formed, which is much higher than suggested by previous studies. We have found that Kozai mechanism by outer planets is responsible for the formation of close-in planets. During the three-planet orbital crossing, the Kozai excitation is repeated and the eccentricity is often increased secularly to values close enough to unity for tidal circularization to transform the inner planet to a close-in planet. Since a moderate eccentricity can remain for the close-in planet, this mechanism may account for the observed close-in planets with moderate eccentricities and without nearby secondary planets. Since these planets also remain a broad range of orbital inclinations (even retrograde ones), the contribution of this process would be clarified by more observations of Rossiter-McLaughlin effects for transiting planets.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 07:55:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Nagasawa", "M.", "" ], [ "Ida", "S.", "" ], [ "Bessho", "T.", "" ] ]
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801.1369
Michel L. E. Rieutord
Michel Rieutord, Nadege Meunier, Thierry Roudier, Sylvain Rondi, Francis Beigbeder and Laurent Pares
Solar supergranulation revealed by granule tracking
4 pages, accepted in Astronomy and Astrophysics (Letters)
null
10.1051/0004-6361:20079077
null
astro-ph
null
Context: Supergranulation is a pattern of the velocity field at the surface of the Sun, which has been known about for more than fifty years, however, no satisfactory explanation of its origin has been proposed. Aims: New observational constraints are therefore needed to guide theoretical approaches which hesitate between scenarios that either invoke a large-scale instability of the surface turbulent convection or a direct forcing by buoyancy. Method: Using the 14-Mpixel CALAS camera at the Pic-du-Midi observatory, we obtained a 7.5h-long sequence of high resolution images with unprecedented field size. Tracking granules, we have determined the velocity field at the Sun's surface in great detail from a scale of 2.5Mm up to 250Mm. Results: The kinetic energy density spectrum shows that supergranulation peaks at 36Mm and spans on scales ranging between 20Mm and 75Mm. The decrease of supergranular flows in the small scales is close to a $k^{-2}$-power law, steeper than the equipartition Kolmogorov one. The probability distribution function of the divergence field shows the signature of intermittency of the supergranulation and thus its turbulent nature.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 08:03:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Rieutord", "Michel", "" ], [ "Meunier", "Nadege", "" ], [ "Roudier", "Thierry", "" ], [ "Rondi", "Sylvain", "" ], [ "Beigbeder", "Francis", "" ], [ "Pares", "Laurent", "" ] ]
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801.137
Takahito Mitsui
Takahito Mitsui
Nonchaotic Stagnant Motion in a Marginal Quasiperiodic Gradient System
11pages, 5figures
Physical Review E 78, 026206 (2008)
10.1103/PhysRevE.78.026206
null
nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A one-dimensional dynamical system with a marginal quasiperiodic gradient is presented as a mathematical extension of a nonuniform oscillator. The system exhibits a nonchaotic stagnant motion, which is reminiscent of intermittent chaos. In fact, the density function of residence times near stagnation points obeys an inverse-square law, due to a mechanism similar to type-I intermittency. However, unlike intermittent chaos, in which the alternation between long stagnant phases and rapid moving phases occurs in a random manner, here the alternation occurs in a quasiperiodic manner. In particular, in case of a gradient with the golden ratio, the renewal of the largest residence time occurs at positions corresponding to the Fibonacci sequence. Finally, the asymptotic long-time behavior, in the form of a nested logarithm, is theoretically derived. Compared with the Pomeau-Manneville intermittency, a significant difference in the relaxation property of the long-time average of the dynamical variable is found.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 10:23:16 GMT" }, { "version": "v2", "created": "Mon, 25 Aug 2008 16:04:43 GMT" } ]
2008-08-25T00:00:00
[ [ "Mitsui", "Takahito", "" ] ]
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801.1371
Kei Funano
Kei Funano
Central and $L^p$-concentration of 1-Lipschitz maps into $\mathbb{R}$-trees
18pages
null
null
null
math.PR math.MG
null
In this paper, we study the L\'{e}vy-Milman concentration phenomenon of 1-Lipschitz maps from mm-spaces to $\mathbb{R}$-trees. Our main theorems assert that the concentration to $\mathbb{R}$-trees is equivalent to the concentration to the real line.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 08:46:49 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 07:25:22 GMT" } ]
2008-02-13T00:00:00
[ [ "Funano", "Kei", "" ] ]
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801.1372
Floris van der Tak
Floris van der Tak (SRON Groningen, NL), Susanne Aalto (Onsala, S), Rowin Meijerink (Berkeley, USA)
Extragalactic H3O+: Some Consequences
Five pages, one figure; contribution to proceedings of conference "Far-infrared observations of the interstellar medium", December 2007, Bad Honnef
null
10.1051/eas:0831022
null
astro-ph
null
We discuss some implications of our recent detection of extragalactic H3O+: the location of the gas in M82, the origin of energetic radiation in M82, and the possible feedback effects of star formation on the cosmic ray flux in galaxies.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 08:49:34 GMT" } ]
2009-11-13T00:00:00
[ [ "van der Tak", "Floris", "", "SRON Groningen, NL" ], [ "Aalto", "Susanne", "", "Onsala, S" ], [ "Meijerink", "Rowin", "", "Berkeley, USA" ] ]
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