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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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-0.0088910805,
0.0328779779,
-0.0535842106,
0.0510167331
] |
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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-0.0395251773,
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-0.0458240099,
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0.0821472779,
-0.0498395152,
-0.052673988,
-0.0048783147,
-0.0226364303,
0.0781055242,
0.1271314472,
-0.0230563525,
-0.0318353511,
0.0093498304,
0.1320655346,
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0.0874487981,
-0.0022341174,
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0.0573193803,
0.016967481,
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0.0042025028,
0.0403650217,
0.0756384879,
0.0134243872,
0.0001884319,
-0.0128076272,
0.04285831,
-0.0417297669,
-0.0449841656,
-0.1881251484,
-0.0530151762,
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0.1241919845,
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0.0365332291,
-0.0742737353,
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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.
| [
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{
"version": "v2",
"created": "Sat, 12 Jul 2008 18:25:17 GMT"
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] | 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",
""
]
] | [
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] |
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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