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801.3173 | Antonietta Marino | L. M. Buson, D. Bettoni, L. Bianchi, A. Buzzoni, A. Marino, R.
Rampazzo | The impact of encounters on the members of Local Group Analogs. A view
from GALEX | 4 pages, 1 figure, Proceedings of the conference:"New Quests in
Stellar Astrophysics II: The Ultraviolet Properties of Evolved Stellar
Populations", Puerto Vallarta, Mexico, April 2007 | null | 10.1007/978-0-387-87621-4_15 | null | astro-ph | null | The bright galaxy population of the Local Group Analog (LGA) LGG 225 has been
imaged with the Galaxy Evolution Explorer (GALEX) through its Far- and Near-UV
wavebands. A significant fraction of the group members appear to underwent
recent/on-going interaction episodes that strongly disturbed overall galaxy
morphology. UV-bright regions, sites of intense star formation activity
accompanied by intense dust extinction, mark the galaxy outskirts forming
irregular structures and tails. Compared to the Local Group, LGG 225 seems thus
to be experiencing a more intense and active evolutionary phase.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 11:11:15 GMT"
}
] | 2020-08-05T00:00:00 | [
[
"Buson",
"L. M.",
""
],
[
"Bettoni",
"D.",
""
],
[
"Bianchi",
"L.",
""
],
[
"Buzzoni",
"A.",
""
],
[
"Marino",
"A.",
""
],
[
"Rampazzo",
"R.",
""
]
] | [
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801.3174 | Kavita Ramanan | Kavita Ramanan, Martin I. Reiman | The heavy traffic limit of an unbalanced generalized processor sharing
model | Published in at http://dx.doi.org/10.1214/07-AAP438 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2008, Vol. 18, No. 1, 22-58 | 10.1214/07-AAP438 | IMS-AAP-AAP438 | math.PR | null | This work considers a server that processes $J$ classes using the generalized
processor sharing discipline with base weight vector $\alpha=(\alpha
_1,...,\alpha_J)$ and redistribution weight vector
$\beta=(\beta_1,...,\beta_J)$. The invariant manifold $\mathcal{M}$ of the
so-called fluid limit associated with this model is shown to have the form
$\mathcal{M}=\{x\in\mathbb{R}_+^J:x_j=0 for j\in\mathcal{S}\}$, where
$\mathcal{S}$ is the set of strictly subcritical classes, which is identified
explicitly in terms of the vectors $\alpha$ and $\beta$ and the long-run
average work arrival rates $\gamma_j$ of each class $j$. In addition, under
general assumptions, it is shown that when the heavy traffic condition
$\sum_{j=1}^J\gamma_j=\sum_{j=1}^J\alpha_j$ holds, the functional central limit
of the scaled unfinished work process is a reflected diffusion process that
lies in $\mathcal{M}$. The reflected diffusion limit is characterized by the
so-called extended Skorokhod map and may fail to be a semimartingale. This
generalizes earlier results obtained for the simpler, balanced case where
$\gamma_j=\alpha_j$ for $j=1,...,J$, in which case $\mathcal{M}=\mathbb{R}_+^J$
and there is no state-space collapse. Standard techniques for obtaining
diffusion approximations cannot be applied in the unbalanced case due to the
particular structure of the GPS model. Along the way, this work also
establishes a comparison principle for solutions to the extended Skorokhod map
associated with this model, which may be of independent interest.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 11:13:40 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Ramanan",
"Kavita",
""
],
[
"Reiman",
"Martin I.",
""
]
] | [
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801.3175 | Antonino Paolo Milone dr | Giampaolo Piotto | Multiple Stellar Populations in Galactic GCs: Observational Evidence | Invited talk given at the Cefalu' 2007 Workshop "XXI Century
Challenges for Stellar Evolution". To appear in Memorie della Societa'
Astronomica Italiana, vol. 79/2, eds. S. Cassisi & M. Salaris | null | null | null | astro-ph | null | An increasing number of photometric observations of multiple stellar
populations in Galactic globular clusters is seriously challenging the paradigm
of GCs hosting single, simple stellar populations. These multiple populations
manifest themselves in a split of some evolutionary sequences of the cluster
color-magnitude diagrams. In this paper we will summarize the observational
scenario.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 11:53:32 GMT"
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] | 2008-01-22T00:00:00 | [
[
"Piotto",
"Giampaolo",
""
]
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] |
801.3176 | David Loeffler | David Loeffler | Explicit calculations of automorphic forms for definite unitary groups | This version fixes an error pointed out by my PhD examiners -- the
previous version cited a form of Ramanujan's conjecture which is in fact
false. Accompanying computer programs available from
http://www.ma.ic.ac.uk/~dl505/ | LMS J. Comput. Math 11 (2008), 326-342 | 10.1112/S1461157000000620 | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I give an algorithm for computing the full space of automorphic forms for
definite unitary groups over Q, and apply this to calculate the automorphic
forms of level $G(Z-hat)$ and various small weights for an example of a rank 3
unitary group. This leads to some examples of various types of endoscopic
lifting from automorphic forms for U_1 x U_1 x U_1 and U_1 x U_2, and to an
example of a non-endoscopic form of weight (3,3) corresponding to a family of
3-dimensional irreducible l-adic Galois representations. I also compute the
2-adic slopes of some automorphic forms with level structure at 2, giving
evidence for the local constancy of the slopes.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 11:56:43 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Aug 2008 16:25:12 GMT"
},
{
"version": "v3",
"created": "Mon, 3 Nov 2008 17:08:04 GMT"
}
] | 2011-04-19T00:00:00 | [
[
"Loeffler",
"David",
""
]
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801.3177 | Antonino Paolo Milone dr | A. P. Milone, G. Piotto, L. R. Bedin, and A. Sarajedini | Photometric binaries in fifty Globular Clusters | Contribution talk given at the Cefalu' 2007 Workshop "XXI Century
Challenges for Stellar Evolution". To appear in Memorie della Societa'
Astronomica Italiana, vol. 79/2, eds. S. Cassisi & M. Salaris | null | null | null | astro-ph | null | The HST/ACS Survey of Galactic globular clusters (GGCs) is a HST Treasury
project aimed at obtaining high precision photometry in a large sample of
globular clusters. The homogeneous photometric catalogs that has been obtained
from these data by Anderson et al. (2008) represents a golden mine for a lot of
astrophysical studies.
In this paper we used the catalog to analyse the properties of MS-MS binary
systems from a sample of fifty GGCs. We measured the fraction of binaries
(divided in different groups), studied their radial distribution and
constrained the mass ratio distribution. We investigated possible relations
between the fraction of binaries and the main parameters of their host GGCs.
We found a significant anti-correlation between the binary fraction in a
cluster and its absolute luminosity (mass).
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 12:26:35 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Milone",
"A. P.",
""
],
[
"Piotto",
"G.",
""
],
[
"Bedin",
"L. R.",
""
],
[
"Sarajedini",
"A.",
""
]
] | [
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801.3178 | Anton Evseev | Anton Evseev | Conjugacy classes in parabolic subgroups of general linear groups | with an appendix by Anton Evseev and George Wellen; 30 pages | null | null | null | math.GR | null | We prove a formula connecting the number of unipotent conjugacy classes in a
maximal parabolic subgroup of a finite general linear group with the numbers of
unipotent conjugacy classes in various parabolic subgroups in smaller
dimensions. We generalise this formula and deduce a number of corollaries; in
particular, we express the number of conjugacy classes of unitriangular
matrices over a finite field in terms of the numbers of unipotent conjugacy
classes in maximal parabolic subgroups over the same field. We show how the
numbers of unipotent conjugacy classes in parabolic subgroups of small
dimensions may be calculated.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 12:42:55 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Evseev",
"Anton",
""
]
] | [
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801.3179 | Sergei Sakovich | Sergei Sakovich | On integrability of the vector short pulse equation | 10 pages | J. Phys. Soc. Jpn. 77 (2008) 123001 (4 pages) | 10.1143/JPSJ.77.123001 | null | nlin.SI math-ph math.AP math.MP physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Painleve analysis preceded by appropriate transformations of
nonlinear systems under investigation, we discover two new cases in which the
Pietrzyk-Kanattsikov-Bandelow vector short pulse equation must be integrable
due to the results of the Painleve test. Those cases are technologically
important because they correspond to the propagation of polarized ultra-short
light pulses in usual isotropic silica optical fibers.
| [
{
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"created": "Mon, 21 Jan 2008 12:53:41 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Aug 2008 09:02:57 GMT"
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] | 2008-11-25T00:00:00 | [
[
"Sakovich",
"Sergei",
""
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801.318 | A. K. Chaudhuri | A. K. Chaudhuri | Viscous fluid dynamics in Au+Au collisions at RHIC | 40 pages, 31 figures. In the revised version two figures (Fig.8 and
9) are added showing that Israel-Stewart's relaxation equation is a good
approximation of the kinetic theory relaxation equation | null | null | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the space-time evolution of minimally viscous
($\frac{\eta}{s}$=0.08) QGP fluid, undergoing boost-invariant longitudinal
motion and arbitrary transverse expansion. Relaxation equations for the shear
stress tensor components, derived from the phenomenological Israel-Stewart's
theory of dissipative relativistic fluid, are solved simultaneously with the
energy-momentum conservation equations. Comparison of evolution of ideal and
viscous fluid, both initialized under the similar conditions, e.g. same
equilibration time, energy density and velocity profile, indicate that in
viscous fluid, energy density or temperature of the fluid evolve slowly than in
an ideal fluid. Transverse expansion is also more in viscous evolution. We have
also studied particle production in viscous dynamics. Compared to ideal
dynamics, in viscous dynamics, particle yield at high $p_T$ is increased.
Elliptic flow on the other hand decreases. Minimally viscous QGP fluid,
initialized at entropy density $s_{ini}$=110 $fm^{-3}$ at the initial time
$\tau_i$=0.6 fm, if freeze-out at temperature $T_F$=130 MeV, explains the
centrality dependence of $p_T$ spectra of identified particles. Experimental
$p_T$ spectra of $\pi^-$, $K^+$ and protons in 0-5%, 5-10%, 10-20%, 20-30%,
30-40% and 40-50% Au+Au collisions are well reproduced through out the
experimental $p_T$ range. This is in contrast to ideal dynamics, where, the
spectra are reproduced only up to $p_T\approx$1.5 GeV. Minimally viscous QGP
fluid, also explain the elliptic flow in mid-central (10-20%, 16-23%, 20-30%)
collisions. The minimum bias elliptic flow is also explained. However, the
model under-predict/over-predict the elliptic flow in very central/peripheral
collisions.
| [
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"created": "Mon, 21 Jan 2008 12:57:21 GMT"
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"created": "Wed, 18 Jun 2008 09:14:06 GMT"
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] | 2008-06-18T00:00:00 | [
[
"Chaudhuri",
"A. K.",
""
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801.3181 | Boaz Tsaban | Boaz Tsaban | SPM Bulletin 23 | null | null | null | null | math.GN math.CO math.LO | null | A surprising number of new results in "core" SPM in the last quarter of 2007,
and some other beautiful fundamental results are announced.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 12:59:51 GMT"
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] | 2008-12-31T00:00:00 | [
[
"Tsaban",
"Boaz",
""
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] |
801.3182 | Ralf Klessen | Ralf S. Klessen (Zentrum fuer Astronomie Heidelberg), Paul C. Clark
(Zentrum fuer Astronomie Heidelberg), Simon C. O. Glover (Astrophysikalisches
Institut Potsdam) | Formation of Stellar Clusters and the Importance of Thermodynamics for
Fragmentation | 10 pages, invited review, to appear in Dynamical Evolution of Dense
Stellar Systems, Proceed. of the IAU Symp. 246 (Capri, Sept. 2007), eds.
E.Vesperini, M. Giersz, and A. Sills | null | 10.1017/S1743921308015196 | null | astro-ph | null | We discuss results from numerical simulations of star cluster formation in
the turbulent interstellar medium (ISM). The thermodynamic behavior of the
star-forming gas plays a crucial role in fragmentation and determines the
stellar mass function as well as the dynamic properties of the nascent stellar
cluster. This holds for star formation in molecular clouds in the solar
neighborhood as well as for the formation of the very first stars in the early
universe. The thermodynamic state of the ISM is a result of the balance between
heating and cooling processes, which in turn are determined by atomic and
molecular physics and by chemical abundances. Features in the effective
equation of state of the gas, such as a transition from a cooling to a heating
regime, define a characteristic mass scale for fragmentation and so set the
peak of the initial mass function of stars (IMF). As it is based on fundamental
physical quantities and constants, this is an attractive approach to explain
the apparent universality of the IMF in the solar neighborhood as well as the
transition from purely primordial high-mass star formation to the more normal
low-mass mode observed today.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 13:02:56 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Klessen",
"Ralf S.",
"",
"Zentrum fuer Astronomie Heidelberg"
],
[
"Clark",
"Paul C.",
"",
"Zentrum fuer Astronomie Heidelberg"
],
[
"Glover",
"Simon C. O.",
"",
"Astrophysikalisches\n Institut Potsdam"
]
] | [
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] |
801.3183 | Shay M Rappaport | S.M. Rappaport, S. Medalion and Y. Rabin | Curvature Distribution of Worm-like Chains in Two and Three Dimensions | null | null | null | null | cond-mat.soft | null | Bending of worm-like polymers carries an energy penalty which results in the
appearance of a persistence length l such that the polymer is straight on
length scales smaller than l and bends only on length scales larger than this
length. Intuitively, this leads us to expect that the most probable value of
the local curvature of a worm-like polymer undergoing thermal fluctuations in a
solvent, is zero. We use simple geometric arguments and Monte Carlo simulations
to show that while this expectation is indeed true for polymers on surfaces (in
two dimensions), in three dimensions the probability of observing zero
curvature anywhere along the worm-like chain, vanishes.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 13:10:48 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Rappaport",
"S. M.",
""
],
[
"Medalion",
"S.",
""
],
[
"Rabin",
"Y.",
""
]
] | [
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] |
801.3184 | Aidan Sudbury | Aidan Sudbury | The expected duration of random sequential adsorption | Published in at http://dx.doi.org/10.1214/07-AAP445 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2008, Vol. 18, No. 1, 100-108 | 10.1214/07-AAP445 | IMS-AAP-AAP445 | math.PR | null | When gas molecules bind to a surface they may do so in such a way that the
adsorption of one molecule inhibits the arrival of others. We consider random
sequential adsorption in which the empty sites of a graph are irreversibly
occupied in random order by a variety of types of ``particles.'' In a finite
region the process terminates when no more particles can arrive. A universal
asymptotic formula for the mean duration is given.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 13:14:02 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Sudbury",
"Aidan",
""
]
] | [
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] |
801.3185 | Emre Tuna | S. Emre Tuna | Synchronizing continuous-time neutrally stable linear systems via
partial-state coupling | 15 pages | null | null | null | math.OC math.DS | null | Synchronization of coupled continuous-time linear systems is studied in a
general setting. For identical neutrally-stable linear systems that are
detectable from their outputs, it is shown that a linear output feedback law
exists under which the coupled systems globally asymptotically synchronize
under all fixed (directed) connected network topologies. An algorithm is
provided to compute one such feedback law based on individual system
parameters. The dual case, where individual systems are neutrally stable and
stabilizable from their inputs, is also considered and parallel results are
established.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 13:18:26 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Tuna",
"S. Emre",
""
]
] | [
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] |
801.3186 | Chang Hyun Baek | Chang Hyun Baek (1, 2), Takahiro Kudoh (2,3) and Kohji Tomisaka (2,3)
((1) Astrophysical Research Center for the Structure and Evolution of the
Cosmos (ARCSEC), Sejong University (2) National Astronomical Observatory of
Japan, (3) Department of Astronomical Science, The Graduate University for
Advanced Studies (SOKENDAI)) | How was the mushroom-shaped GW 123.4--1.5 formed in the Galactic disk? | Revised the manuscript and added references, 23 pages with 9 figures | Astrophys.J. 682 (2008) 434-444 | 10.1086/589556 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The unusual mushroom-shaped HI cloud, GW 123.4--1.5, is hundreds of parsecs
in size but does not show any correlations to HI shells or chimney structures.
To investigate the origin and velocity structure of GW 123.4--1.5, we perform
three-dimensional hydrodynamical simulations of the collision of a
high-velocity cloud with the Galactic disk. We also perform a parameter study
of the density, radius, and incident angle of the impact cloud. The numerical
experiments indicate that we reproduce the mushroom-shaped structure which
resembles GW 123.4--1.5 in shape, size, position-velocity across the cap of the
mushroom, and the density ratio between the mushroom and surrounding gas. GW
123.4--1.5 is expected to be formed by the almost head-on collision of a HVC
with velocity $\sim 100 \kms$ and mass $\sim 10^5 \Msun$ about $5 \times 10^7
\yr$ ago. A mushroom-shaped structure like GW 123.4--1.5 must be infrequent on
the Galactic plane, because the head-on collision which explains the mushroom
structure seems rare for observed HVCs. HVC-disk collision explains not only
the origin of the mushroom-shaped structure but also the formation of a variety
of structures like shells, loops, and vertical structures in our Galaxy.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 13:56:34 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Jul 2008 12:25:27 GMT"
}
] | 2008-07-21T00:00:00 | [
[
"Baek",
"Chang Hyun",
""
],
[
"Kudoh",
"Takahiro",
""
],
[
"Tomisaka",
"Kohji",
""
]
] | [
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] |
801.3187 | Thomas Wiegelmann | T. Wiegelmann, K. Schindler, T. Neukirch | Helmet Streamers with Triple Structures: Simulations of resistive
dynamics | 17 pages, 6 figures | Solar Phys.191:391-407,2000 | 10.1023/A:1005226213819 | null | astro-ph | null | Recent observations of the solar corona with the LASCO coronagraph on board
of the SOHO spacecraft have revealed the occurrence of triple helmet streamers
even during solar minimum, which occasionally go unstable and give rise to
large coronal mass ejections. There are also indications that the slow solar
wind is either a combination of a quasi-stationary flow and a highly
fluctuating component or may even be caused completely by many small eruptions
or instabilities. As a first step we recently presented an analytical method to
calculate simple two-dimensional stationary models of triple helmet streamer
configurations. In the present contribution we use the equations of time-
dependent resistive magnetohydrodynamics to investigate the stability and the
dynamical behaviour of these configurations. We particularly focus on the
possible differences between the dynamics of single isolated streamers and
triple streamers and on the way in which magnetic reconnection initiates both
small scale and large scale dynamical behaviour of the streamers. Our results
indicate that small eruptions at the helmet streamer cusp may incessantly
accelerate small amounts of plasma without significant changes of the
equilibrium configuration and might thus contribute to the non-stationary slow
solar wind. On larger time and length scales, large coronal eruptions can occur
as a consequence of large scale magnetic reconnection events inside the
streamer configuration. Our results also show that triple streamers are usually
more stable than a single streamer.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 13:40:44 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Wiegelmann",
"T.",
""
],
[
"Schindler",
"K.",
""
],
[
"Neukirch",
"T.",
""
]
] | [
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] |
801.3188 | O-Kab Kwon | Akira Ishida, Yoonbai Kim, Chanju Kim, O-Kab Kwon | Lower Dimensional Branes in Boundary Conformal Field Theory | 5 pages | J.KoreanPhys.Soc.50:S36-S40,2007 | null | null | hep-th | null | In the presence of constant background electromagnetic fields, we discuss
three types of exactly marginal boundary tachyon operators for static kinks in
boundary conformal field theory. Functional forms of three operators are
hyperbolic sine, hyperbolic cosine, and exponential types, and they describe
codimension-one solitons when the transverse electric field has overcritical
value. The energy-momentum tensor and the source for antisymmetric tensor field
are computed in the path integral approach for the exponential-type tachyon
vertex operator.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:33:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ishida",
"Akira",
""
],
[
"Kim",
"Yoonbai",
""
],
[
"Kim",
"Chanju",
""
],
[
"Kwon",
"O-Kab",
""
]
] | [
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] |
801.3189 | Christian Jansson | Christian Jansson | A classical interpretation of quantum mechanics and the measurement
problem | null | null | null | null | quant-ph | null | In this paper a didactic approach is described which immediately leads to an
understanding of those postulates of quantum mechanics used most frequently in
quantum computation. Moreover, an interpretation of quantum mechanics is
presented which is motivated by retaining the point of view of classical
mechanics as much as possible, and which is consistent with relativity theory.
Everything can be written down in terms of well-known mathematical formulations
that can be found in every textbook about quantum mechanics. Therefore, in this
version, almost no formulas are used.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 13:42:16 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Jansson",
"Christian",
""
]
] | [
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] |
801.319 | Raul de Diego | R. de Diego, E. Garrido, A.S. Jensen and D.V. Fedorov | Cluster sum rules for three-body systems with angular-momentum dependent
interactions | 11 pages, 3 figures, 2 tables | Phys.Rev.C77:024001,2008 | 10.1103/PhysRevC.77.024001 | null | nucl-th | null | We derive general expressions for non-energy weighted and energy-weighted
cluster sum rules for systems of three charged particles. The interferences
between pairs of particles are found to play a substantial role. The
energy-weighted sum rule is usually determined by the kinetic energy operator,
but we demonstrate that it has similar additional contributions from the
angular momentum and parity dependence of two- and three-body potentials
frequently used in three-body calculations. The importance of the different
contributions is illustrated with the dipole excitations in $^6$He. The results
are compared with the available experimental data.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 13:47:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"de Diego",
"R.",
""
],
[
"Garrido",
"E.",
""
],
[
"Jensen",
"A. S.",
""
],
[
"Fedorov",
"D. V.",
""
]
] | [
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] |
801.3191 | Xin Guo | Xin Guo, Yan Zeng | Intensity process and compensator: A new filtration expansion approach
and the Jeulin--Yor theorem | Published in at http://dx.doi.org/10.1214/07-AAP447 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2008, Vol. 18, No. 1, 120-142 | 10.1214/07-AAP447 | IMS-AAP-AAP447 | math.PR q-fin.RM | null | Let $(X_t)_{t\ge0}$ be a continuous-time, time-homogeneous strong Markov
process with possible jumps and let $\tau$ be its first hitting time of a Borel
subset of the state space. Suppose $X$ is sampled at random times and suppose
also that $X$ has not hit the Borel set by time $t$. What is the intensity
process of $\tau$ based on this information? This question from credit risk
encompasses basic mathematical problems concerning the existence of an
intensity process and filtration expansions, as well as some conceptual issues
for credit risk. By revisiting and extending the famous Jeulin--Yor [Lecture
Notes in Math. 649 (1978) 78--97] result regarding compensators under a general
filtration expansion framework, a novel computation methodology for the
intensity process of a stopping time is proposed. En route, an analogous
characterization result for martingales of Jacod and Skorohod [Lecture Notes in
Math. 1583 (1994) 21--35] under local jumping filtration is derived.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 14:59:08 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Guo",
"Xin",
""
],
[
"Zeng",
"Yan",
""
]
] | [
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] |
801.3192 | J. Miguel Mas-Hesse | J. M. Mas-Hesse, H. Oti-Floranes and M. Cervi\~no | Soft X-ray to Far Infrared luminosities ratio in star-forming galaxies | 8 pages, 6 figures. Accepted by Astronomy and Astrophysics. New
version including language style revision and 3 new references | null | null | null | astro-ph | null | A good correlation has been found in star-forming galaxies between the soft
X-ray and the far infrared or radio luminosities. In this work we analyze the
relation between the soft X-ray and far infrared luminosities as predicted by
evolutionary population synthesis models, aiming first to test the validity of
the soft X-ray luminosity as a star formation rate estimator, using the already
known calibration of the FIR luminosity as a proxy, and second proposing a
calibration based on the predictions of evolutionary synthesis models. We have
computed the soft X-ray and far infrared luminosities expected for a massive
starburst as a function of evolutionary state, efficiency of the conversion of
mechanical energy into soft X-ray luminosity, star formation regime
(instantaneous or extended) and dust abundance, and have compared the
predictions with observational values for a sample of 62 star-forming galaxies
taken from the literature. The observational Lsoftx/Lfir ratios are consistent
with the predictions by the models under realistic assumptions (young
starbursts, efficiency in the re-processing of mechanical energy of few
percent), confirming the direct relation of the diffuse soft X-ray emission
with the star formation episode. The soft X-ray emission of the diffuse,
extended gas surrounding massive star forming regions can be used as a Star
Formation Rate estimator. The empirical calibrations presented in the
literature are supported by the predictions of evolutionary synthesis models
and by the analysis of a larger sample of star-forming galaxies, but it is
biased towards galaxies dominated by relatively unevolved starbursts.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:00:00 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Mar 2008 16:19:55 GMT"
}
] | 2008-03-13T00:00:00 | [
[
"Mas-Hesse",
"J. M.",
""
],
[
"Oti-Floranes",
"H.",
""
],
[
"Cerviño",
"M.",
""
]
] | [
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801.3193 | Nicola Zurlo | N.Zurlo, M.Amoretti, C.Amsler, G.Bonomi, C.Carraro, C.L.Cesar,
M.Charlton, M.Doser, A.Fontana, R.Funakoshi, P.Genova, R.S.Hayano,
L.V.Jorgensen, A.Kellerbauer, V.Lagomarsino, R.Landua, E.Lodi Rizzini,
M.Macri', N.Madsen, G.Manuzio, D.Mitchard, P.Montagna, L.G.Posada, H.Pruys,
C.Regenfus, A.Rotondi, G.Testera, D.P.Van der Werf, A.Variola, L.Venturelli
and Y.Yamazaki | Production of Slow Protonium in Vacuum | 9 pages with 5 figures and 1 table. Proceedings of the 4th
International Conference on Trapped Charged Particles and Fundamental Physics
(TCP 06), published in Hyperfine Interactions | Hyperfine Interact.172:97-105,2006 | 10.1007/s10751-007-9529-0 | null | hep-ex | null | We describe how protonium, the quasi-stable antiproton-proton bound system,
has been synthesized following the interaction of antiprotons with the
molecular ion H$_2^+$ in a nested Penning trap environment. From a careful
analysis of the spatial distributions of antiproton annihilation events in the
ATHENA experiment, evidence is presented for protonium production with sub-eV
kinetic energies in states around $n$ = 70, with low angular momenta. This work
provides a new 2-body system for study using laser spectroscopic techniques.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 14:45:38 GMT"
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] | 2010-01-28T00:00:00 | [
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801.3194 | Jaromir Tosiek Dr. | Jaromir Tosiek | The Fedosov *-product in Mathematica | 9 pages. Revised version. Notation has been modified | Computer Physics Communications 179 (2008), 924-930 | 10.1016/j.cpc.2008.07.009 | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The computer program `Fecom.nb' implementing the Fedosov *-product in Darboux
coordinates is presented. It has been written in Mathematica 6.0 but it can be
easily modified to be run in some earlier version of Mathematica. To optimize
computations elements of the Weyl algebra are treated as polynomials. Several
procedures which order the terms are included.
The program is available at the web page
http://cpc.cs.qub.ac.uk/summaries/AEBU_v1_0.html
| [
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{
"version": "v2",
"created": "Fri, 14 Nov 2008 13:12:59 GMT"
}
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801.3195 | Miriam Giorgini | S. Cecchini, T. Chiarusi, G. Giacomelli, M. Giorgini, A. Kumar, G.
Mandrioli, S. Manzoor, A. R. Margiotta, E. Medinaceli, L. Patrizii, V. Popa,
I. E. Qureshi, G. Sirri, M. Spurio and V. Togo | Fragmentation cross sections of Fe^{26+}, Si^{14+} and C^{6+} ions of
0.3-10 A GeV on polyethylene, CR39 and aluminum targets | 8 pages, 6 EPS figures. Submitted to Nucl. Phys. A | Nucl.Phys.A807:206-213,2008 | 10.1016/j.nuclphysa.2008.03.017 | null | nucl-ex | null | We present new measurements of the total and partial fragmentation cross
sections in the energy range 0.3-10 A GeV of 56Fe, 28Si and 12C beams on
polyethylene, CR39 and aluminum targets. The exposures were made at BNL, USA
and HIMAC, Japan. The CR39 nuclear track detectors were used to identify the
incident and survived beams and their fragments. The total fragmentation cross
sections for all targets are almost energy independent while they depend on the
target mass. The measured partial fragmentation cross sections are also
discussed.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:19:06 GMT"
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] |
801.3196 | Vasiliy Kharchenko | E.D.Belokolos, V.O.Kharchenko, D.O.Kharchenko | Chaos in a generalized Lorenz system | null | Chaos, Solitons and Fractals, 41, 2595 (2009) | 10.1016/j.chaos.2008.09.049 | null | nlin.CD | null | A three-component dynamic system with influence of pumping and nonlinear
dissipation describing a quantum cavity electrodynamic device is studied.
Different dynamical regimes are investigated in terms of divergent trajectories
approaches and fractal statistics. It has been shown, that in such a system
stable and unstable dissipative structures type of limit cycles can be formed
with variation of pumping and nonlinear dissipation rate. Transitions to
chaotic regime and the corresponding chaotic attractor are studied in details.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:28:46 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Belokolos",
"E. D.",
""
],
[
"Kharchenko",
"V. O.",
""
],
[
"Kharchenko",
"D. O.",
""
]
] | [
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] |
801.3197 | Michele Ortolani | M. Ortolani, P. Dore, D. Di Castro, A. Perucchi, S. Lupi, V. Ferrando,
M. Putti, I. Pallecchi, C. Ferdeghini and X. X. Xi | Two-band parallel conductivity at terahertz frequencies in the
superconducting state of MgB$_2$. | 4 pages, 3 figures | null | 10.1103/PhysRevB.77.100507 | null | cond-mat.supr-con | null | The optical response of the two-band superconductor MgB$_2$ has been studied
in the 0.7-4 THz range on films with very low impurity level. The effect of the
high-energy $\sigma$-gap is observed in the ratio $R_S/R_N$ between the normal
and superconducting state reflectance, while in a neutron irradiated film with
a slightly higher impurity level mainly the effect of the $\pi$-gap is evident
as reported in previous experiments. At terahertz frequencies, the
electrodynamic of MgB$_2$ can be well described by the two-band parallel
conductivity model and is dominated by the $\pi$-bands when the impurity level
is only slightly higher than that of an ultra-clean sample.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 14:35:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ortolani",
"M.",
""
],
[
"Dore",
"P.",
""
],
[
"Di Castro",
"D.",
""
],
[
"Perucchi",
"A.",
""
],
[
"Lupi",
"S.",
""
],
[
"Ferrando",
"V.",
""
],
[
"Putti",
"M.",
""
],
[
"Pallecchi",
"I.",
""
],
[
"Ferdeghini",
"C.",
""
],
[
"Xi",
"X. X.",
""
]
] | [
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-0.0990512222,
0.0173743106,
-0.0711111128,
-0.0100236405
] |
801.3198 | Khangulyan Dmitry | F. Aharonian, D. Khangulyan, L. Costamante | Formation of hard VHE gamma-ray spectra of blazars due to internal
photon-photon absorption | 10 pages, 8 figures, submitted to MNRAS | null | 10.1111/j.1365-2966.2008.13315.x | null | astro-ph | null | The energy spectra of TeV gamma-rays from blazars, after being corrected for
intergalatic absorption in the Extragalactic Background Light (EBL), appear
unusually hard, a fact that poses challenges to the conventional models of
particle acceleration in TeV blazars and/or to the EBL models. In this paper we
show that the internal absorption of gamma-rays caused by interactions with
dense narrow-band radiation fields in the vicinity of compact gamma-ray
production regions can lead to the formation of gamma-ray spectra of an almost
arbitrary hardness. This allows significant relaxation of the current tight
constraints on particle acceleration and radiation models, although at the
expense of enhanced requirements to the available nonthermal energy budget. The
latter, however, is not a critical issue, as long as it can be largely
compensated by the Doppler boosting, assuming very large ($\geq 30$) Doppler
factors of the relativistically moving gamma-ray production regions. The
suggested scenario of formation of hard gamma-ray spectra predicts detectable
synchrotron radiation of secondary electron-positron pairs which might require
a revision of the current ``standard paradigm'' of spectral energy
distributions of gamma-ray blazars. If the primary gamma-rays are of hadronic
origin related to $pp$ or $p \gamma$ interactions, the ``internal gamma-ray
absorption'' model predicts neutrino fluxes close to the detection threshold of
the next generation high energy neutrino detectors.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:12:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Aharonian",
"F.",
""
],
[
"Khangulyan",
"D.",
""
],
[
"Costamante",
"L.",
""
]
] | [
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] |
801.3199 | Ngoc-Diep Ho | Ngoc-Diep Ho (1), Paul Van Dooren (1) and Vincent D. Blondel (1) ((1)
Universit\'e catholique de Louvain, Belgium) | Descent methods for Nonnegative Matrix Factorization | 47 pages. New convergence proof using damped version of RRI. To
appear in Numerical Linear Algebra in Signals, Systems and Control. Accepted.
Illustrating Matlab code is included in the source bundle | null | null | 2007.057 | cs.NA cs.IR math.OC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present several descent methods that can be applied to
nonnegative matrix factorization and we analyze a recently developped fast
block coordinate method called Rank-one Residue Iteration (RRI). We also give a
comparison of these different methods and show that the new block coordinate
method has better properties in terms of approximation error and complexity. By
interpreting this method as a rank-one approximation of the residue matrix, we
prove that it \emph{converges} and also extend it to the nonnegative tensor
factorization and introduce some variants of the method by imposing some
additional controllable constraints such as: sparsity, discreteness and
smoothness.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:46:43 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 21:20:12 GMT"
},
{
"version": "v3",
"created": "Mon, 24 Aug 2009 22:32:24 GMT"
}
] | 2009-08-25T00:00:00 | [
[
"Ho",
"Ngoc-Diep",
""
],
[
"Van Dooren",
"Paul",
""
],
[
"Blondel",
"Vincent D.",
""
]
] | [
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] |
801.32 | Pawel Caban | Pawe{\l} Caban, Jakub Rembieli\'nski, Marta W{\l}odarczyk | Einstein-Podolsky-Rosen correlations of vector bosons | 11 pages, 8 figures | Phys. Rev. A 77, 012103 (2008) | 10.1103/PhysRevA.77.012103 | null | quant-ph | null | We calculate the joint probabilities and the correlation function in
Einstein--Podolsky--Rosen type experiments with a massive vector boson in the
framework of quantum field theory. We report on the strange behavior of the
correlation function (and the probabilities) -- the correlation function, which
in the relativistic case still depends on the particle momenta, for some fixed
configurations has local extrema. We also show that relativistic spin-1
particles violate some Bell inequalities more than nonrelativistic ones and
that the degree of violation of the Bell inequality is momentum dependent.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:04:27 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Caban",
"Paweł",
""
],
[
"Rembieliński",
"Jakub",
""
],
[
"Włodarczyk",
"Marta",
""
]
] | [
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] |
801.3201 | Norma Mankoc Borstnik | M. Gregoric, N.S. Mankoc Borstnik | Quantum gates and quantum algorithms with Clifford algebra technique | 9 pages, revtex | null | 10.1007/s10773-008-9826-7 | null | quant-ph | null | We use our Clifford algebra technique, that is nilpotents and projectors
which are binomials of the Clifford algebra objects $\gamma^a$ with the
property $\{\gamma^a,\gamma^b\}_+ = 2 \eta^{ab}$, for representing quantum
gates and quantum algorithms needed in quantum computers in an elegant way. We
identify $n$-qubits with spinor representations of the group SO(1,3) for a
system of $n$ spinors. Representations are expressed in terms of products of
projectors and nilpotents. An algorithm for extracting a particular information
out of a general superposition of $2^n$ qubit states is presented. It
reproduces for a particular choice of the initial state the Grover's algorithm.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 14:56:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gregoric",
"M.",
""
],
[
"Borstnik",
"N. S. Mankoc",
""
]
] | [
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] |
801.3202 | Serguei Brazovskii | S. Brazovskii | New Routes to Solitons in Quasi One-Dimensional Conductors | Proceedings of ISCOM 2007, to be published in Solid State Sciences
(2008) | null | 10.1016/j.solidstatesciences.2008.01.022 | null | cond-mat.str-el | null | We collect evidences on existence of microscopic solitons, and their
determining role in electronic processes of quasi-1D conductors. The
ferroelectric charge ordering gives access to several types of solitons in
conductivity and permittivity, and to solitons' bound pairs in optics - both in
insulating and conducting cases of TMTTF and TMTSF subfamilies. The excursion
to physics of conjugated polymers allows to suggest further experiments.
Internal tunnelling in Charge Density Waves goes through the channel of
"amplitude solitons", which correspond to the long sought quasi-particle - the
spinon. The same experiment gives an access to the reversible reconstruction of
the junction via spontaneous creation of a lattice of 2Pi solitons - a grid of
dislocations. The individual 2Pi solitons have been visually captured in recent
STM experiments. Junctions of organic and oxide conductors are anticipated to
show similar effects of reconstruction.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:22:42 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 11:17:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brazovskii",
"S.",
""
]
] | [
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801.3203 | Christian Bender | Christian Bender, Jianfeng Zhang | Time discretization and Markovian iteration for coupled FBSDEs | Published in at http://dx.doi.org/10.1214/07-AAP448 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2008, Vol. 18, No. 1, 143-177 | 10.1214/07-AAP448 | IMS-AAP-AAP448 | math.PR | null | In this paper we lay the foundation for a numerical algorithm to simulate
high-dimensional coupled FBSDEs under weak coupling or monotonicity conditions.
In particular, we prove convergence of a time discretization and a Markovian
iteration. The iteration differs from standard Picard iterations for FBSDEs in
that the dimension of the underlying Markovian process does not increase with
the number of iterations. This feature seems to be indispensable for an
efficient iterative scheme from a numerical point of view. We finally suggest a
fully explicit numerical algorithm and present some numerical examples with up
to 10-dimensional state space.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:27:08 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Bender",
"Christian",
""
],
[
"Zhang",
"Jianfeng",
""
]
] | [
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] |
801.3204 | Piero Olla | Piero Olla and Maria Raffaella Vuolo | Perturbation theory for large Stokes number particles in random velocity
fields | Latex, 12 pages, 2 eps figures included | Eur. Phys. J. B Vol. 65, 279 (2008) | 10.1140/epjb/e2008-00354-y | null | cond-mat.stat-mech nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a perturbative approach to study, in the large inertia limit, the
dynamics of solid particles in a smooth, incompressible and finite-time
correlated random velocity field. We carry on an expansion in powers of the
inverse square root of the Stokes number, defined as the ratio of the
relaxation time for the particle velocities and the correlation time of the
velocity field. We describe in this limit the residual concentration
fluctuations of the particle suspension, and determine the contribution to the
collision statistics produced by clustering. For both concentration
fluctuations and collision velocities, we analyze the differences with the
compressible one-dimensional case.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:36:01 GMT"
},
{
"version": "v2",
"created": "Fri, 26 Sep 2008 13:26:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Olla",
"Piero",
""
],
[
"Vuolo",
"Maria Raffaella",
""
]
] | [
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] |
801.3205 | Ram\'on Luna | R. Luna, C. Millan, M. Domingo, M. A. Satorre | Thermal desorption of CH4 retained in CO2 ice | 8 pages, accepted for publication in Astrophysics & Space Science | Astrophys.Space Sci.314:113-119,2008 | 10.1007/s10509-008-9746-2 | null | astro-ph | null | CO2 ices are known to exist in different astrophysical environments. In spite
of this, its physical properties (structure, density, refractive index) have
not been as widely studied as those of water ice. It would be of great value to
study the adsorption properties of this ice in conditions related to
astrophysical environments. In this paper, we explore the possibility that CO2
traps relevant molecules in astrophysical environments at temperatures higher
than expected from their characteristic sublimation point. To fulfil this aim
we have carried out desorption experiments under High Vacuum conditions based
on a Quartz Crystal Microbalance and additionally monitored with a Quadrupole
Mass Spectrometer. From our results, the presence of CH4 in the solid phase
above the sublimation temperature in some astrophysical scenarios could be
explained by the presence of several retaining mechanisms related to the
structure of CO2 ice.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:44:26 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Luna",
"R.",
""
],
[
"Millan",
"C.",
""
],
[
"Domingo",
"M.",
""
],
[
"Satorre",
"M. A.",
""
]
] | [
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] |
801.3206 | Harald Dorn | Harald Dorn and George Jorjadze | Operator Approach to Boundary Liouville Theory | 45 pages, 5 figures, extented subsection 4.3.2, related minor changes
in subsections 3.3 and 4.2 | Annals Phys.323:2799-2839,2008 | 10.1016/j.aop.2008.02.009 | HU-EP-07/65 | hep-th | null | We propose new methods for calculation of the discrete spectrum, the
reflection amplitude and the correlation functions of boundary Liouville theory
on a strip with Lorentzian signature. They are based on the structure of the
vertex operator $V=e^{-\phi}$ in terms of the asymptotic operators. The methods
first are tested for the particle dynamics in the Morse potential, where
similar structures appear. Application of our methods to boundary Liouville
theory reproduces the known results obtained earlier in the bootstrap approach,
but there can arise a certain extension when the boundary parameters are near
to critical values. Namely, in this case we have found up to four different
equidistant series of discrete spectra, and the reflection amplitude is
modified respectively.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:57:27 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 15:46:22 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Dorn",
"Harald",
""
],
[
"Jorjadze",
"George",
""
]
] | [
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] |
801.3207 | Dong Xu | Dong Xu and Jia-Lin Zhu | Fine-structure splitting reduction of ionized impurity bound exciton in
quantum dot | 4 pages, 3 figures | null | null | null | cond-mat.mes-hall | null | The ground-state energy and fine-structure splitting of ionized shallow donor
impurity-exciton complex in quantum dots are investigated. It is found that
fine-structure splitting could be largely reduced by the off-center ionized
impurities since the anisotropic shape of exciton envelope function is
significantly changed. Anomalous Stark shifts of the ground-state energy and
efficient tuning of the fine-structure splitting by the external electric field
due to the local electric field produced by the ionized impurities are
discussed. The scheme may be useful for the design of the quantum dots-based
entangled-photon source.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:47:40 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Xu",
"Dong",
""
],
[
"Zhu",
"Jia-Lin",
""
]
] | [
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] |
801.3208 | Christof Wetterich | C. Wetterich | Naturalness of exponential cosmon potentials and the cosmological
constant problem | 19 pages | Phys.Rev.D77:103505,2008 | 10.1103/PhysRevD.77.103505 | null | hep-th | null | We discuss the naturalness of exponential potentials for quintessence,
showing that the resulting almost flat direction in the space of scalar fields,
as well as the small time dependent cosmon mass, can be related to an anomalous
dilatation symmetry. We argue that the physics of the cosmological constant is
Planck scale physics, and comment on the role of quantum fluctuations. We
present three higher dimensional scenarios how a runaway of the ``cosmological
constant'' to zero can be combined with stable particle physics properties,
leading at most to small variations of the ``fundamental couplings''.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:48:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wetterich",
"C.",
""
]
] | [
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] |
801.3209 | Uwe Aickelin | Uwe Aickelin | A Pyramidal Evolutionary Algorithm with Different Inter-Agent Partnering
Strategies for Scheduling Problems | null | Proceedings of the Genetic and Evolutionary Computation Conference
(GECCO 2001), late-breaking papers volume, pp 1-8, San Francisco, USA | null | null | cs.NE cs.CE | null | This paper combines the idea of a hierarchical distributed genetic algorithm
with different inter-agent partnering strategies. Cascading clusters of
sub-populations are built from bottom up, with higher-level sub-populations
optimising larger parts of the problem. Hence higher-level sub-populations
search a larger search space with a lower resolution whilst lower-level
sub-populations search a smaller search space with a higher resolution. The
effects of different partner selection schemes amongst the agents on solution
quality are examined for two multiple-choice optimisation problems. It is shown
that partnering strategies that exploit problem-specific knowledge are superior
and can counter inappropriate (sub-) fitness measurements.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:55:22 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 17:10:36 GMT"
}
] | 2010-07-05T00:00:00 | [
[
"Aickelin",
"Uwe",
""
]
] | [
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] |
801.321 | Charlotte Elster | T. Lin, Ch. Elster, W.N. Polyzou, H. Witala, W. Gloeckle | Poincar\'e Invariant Three-Body Scattering at Intermediate Energies | 16 pages, 13 figures | Phys.Rev.C78:024002,2008 | 10.1103/PhysRevC.78.024002 | null | nucl-th nucl-ex | null | The relativistic Faddeev equation for three-nucleon scattering is formulated
in momentum space and directly solved in terms of momentum vectors without
employing a partial wave decomposition. The equation is solved through Pad\'e
summation, and the numerical feasibility and stability of the solution is
demonstrated. Relativistic invariance is achieved by constructing a dynamical
unitary representation of the Poincar\'e group on the three-nucleon Hilbert
space. Based on a Malfliet-Tjon type interaction, observables for elastic and
break-up scattering are calculated for projectile energies in the intermediate
energy range up to 2 GeV, and compared to their nonrelativistic counterparts.
The convergence of the multiple scattering series is investigated as a function
of the projectile energy in different scattering observables and
configurations. Approximations to the two-body interaction embedded in the
three-particle space are compared to the exact treatment.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:34:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lin",
"T.",
""
],
[
"Elster",
"Ch.",
""
],
[
"Polyzou",
"W. N.",
""
],
[
"Witala",
"H.",
""
],
[
"Gloeckle",
"W.",
""
]
] | [
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] |
801.3211 | Sergio Console | Sergio Console, Carlos Olmos | Curvature invariants, Killing vector fields, connections and
cohomogeneity | 4 pages | null | null | null | math.DG | null | A direct, bundle-theoretic method for defining and extending local isometries
out of curvature data is developed. As a by-product, conceptual direct proofs
of a classical result of Singer and a recent result of the authors are derived.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 14:39:30 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 16:55:49 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Console",
"Sergio",
""
],
[
"Olmos",
"Carlos",
""
]
] | [
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] |
801.3212 | Tihamer Geyer | Tihamer Geyer and Uwe Winter | An O(N^2) Approximation for Hydrodynamic Interactions in Brownian
Dynamics Simulations | 8 pages, 4 figures; extended version: better approximation + added
comparison to Ermak and Fixman HI for bead-spring polymers; submitted to JCP | J. Chem. Phys. 130 (2009) 114905 | 10.1063/1.3089668 | null | cond-mat.soft | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Ermak-McCammon algorithm for Brownian Dynamics, the hydrodynamic
interactions (HI) between N spherical particles are described by a 3N x 3N
diffusion tensor. This tensor has to be factorized at each timestep with a
runtime of O(N^3), making the calculation of the correlated random
displacements the bottleneck for many-particle simulations. Here we present a
faster algorithm for this step, which is based on a truncated expansion of the
hydrodynamic multi-particle correlations as two-body contributions. The
comparison to the exact algorithm and to the Chebyshev approximation of Fixman
verifies that for bead-spring polymers this approximation yields about 95% of
the hydrodynamic correlations at an improved runtime scaling of O(N^2) and a
reduced memory footprint. The approximation is independent of the actual form
of the hydrodynamic tensor and can be applied to arbitrary particle
configurations. This now allows to include HI into large many-particle Brownian
dynamics simulations, where until now the runtime scaling of the correlated
random motion was prohibitive.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:16:08 GMT"
},
{
"version": "v2",
"created": "Fri, 5 Dec 2008 22:16:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Geyer",
"Tihamer",
""
],
[
"Winter",
"Uwe",
""
]
] | [
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] |
801.3213 | Wei Zhang | Jie-Yun Yan, Wei Zhang, Suqing Duan, Xian-Geng Zhao, and Alexander O.
Govorov | Optical properties of coupled metal-semiconductor and metal-molecule
nanocrystal complexes: the role of multipole effects | 9 pages | null | 10.1103/PhysRevB.77.165301 | null | cond-mat.mes-hall | null | We investigate theoretically the effects of interaction between an optical
dipole (semiconductor quantum dot or molecule) and metal nanoparticles. The
calculated absorption spectra of hybrid structures demonstrate strong effects
of interference coming from the exciton-plasmon coupling. In particular, the
absorption spectra acquire characteristic asymmetric lineshapes and strong
anti-resonances. We present here an exact solution of the problem beyond the
dipole approximation and find that the multipole treatment of the interaction
is crucial for the understanding of strongly-interacting exciton-plasmon
nano-systems. Interestingly, the visibility of the exciton resonance becomes
greatly enhanced for small inter-particle distances due to the interference
phenomenon, multipole effects, and electromagnetic enhancement. We find that
the destructive interference is particularly strong. Using our exact theory, we
show that the interference effects can be observed experimentally even in the
exciting systems at room temperature.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:11:19 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 12:45:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yan",
"Jie-Yun",
""
],
[
"Zhang",
"Wei",
""
],
[
"Duan",
"Suqing",
""
],
[
"Zhao",
"Xian-Geng",
""
],
[
"Govorov",
"Alexander O.",
""
]
] | [
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] |
801.3214 | Arnaud Belloche | A. Belloche, C. Comito, C. Hieret, K. M. Menten, H. S. P. Mueller, P.
Schilke | The search for complex molecules in the ISM: a complete 3 mm line survey
of Sgr B2-N and -M | 4 pages, 2 figures, to appear in the proceedings of the conference
"Molecules in Space & Laboratory" held in Paris, France, 14-18 May 2007 | null | null | null | astro-ph | null | Famous for the extraordinary richness of its molecular content, the Sgr B2
molecular cloud complex is the prime target in the long-standing search for
ever more complex species. We have completed a molecular line survey of the hot
dense cores Sgr B2(N) and Sgr B2(M) in the 3 mm wavelength range with the IRAM
30 m telescope. We performed the analysis of this huge data set by modeling the
whole spectrum at once in the LTE approximation. Ongoing analyses yield an
average line density of about 100 features/GHz above 3 sigma for Sgr B2(N),
emitted and/or absorbed by a total of 51 molecular species. We find lines from
60 rare isotopologues and from 41 vibrationally excited states in addition to
the main species, vibrational ground state lines. For Sgr B2(M), we find about
25 features/GHz above 3 sigma, from 41 molecular species plus 50 isotopologues
and 20 vibrationally excited states. Thanks to the constant updates to the
Cologne Database for Molecular Spectroscopy, we are working our way through the
assignment of the unidentified features, currently 40% and 50% above 3 sigma
for Sgr B2(N) and Sgr B2(M), respectively.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:16:51 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Belloche",
"A.",
""
],
[
"Comito",
"C.",
""
],
[
"Hieret",
"C.",
""
],
[
"Menten",
"K. M.",
""
],
[
"Mueller",
"H. S. P.",
""
],
[
"Schilke",
"P.",
""
]
] | [
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801.3215 | Thomas Wiegelmann | T. Wiegelmann and T. Neukirch | Computing nonlinear force free coronal magnetic fields | 10 pages, 3 figures | Nonlin.Proc.Geophys.10:313-322,2003 | 10.5194/npg-10-313-2003 | null | astro-ph | null | Knowledge of the structure of the coronal magnetic field is important for our
understanding of many solar activity phenomena, e.g. flares and CMEs. However,
the direct measurement of coronal magnetic fields is not possible with present
methods, and therefore the coronal field has to be extrapolated from
photospheric measurements. Due to the low plasma beta the coronal magnetic
field can usually be assumed to be approximately force free, with electric
currents flowing along the magnetic field lines. There are both observational
and theoretical reasons which suggest that at least prior to an eruption the
coronal magnetic field is in a nonlinear force free state. Unfortunately the
computation of nonlinear force free fields is way more difficult than potential
or linear force free fields and analytic solutions are not generally available.
We discuss several methods which have been proposed to compute nonlinear force
free fields and focus particularly on an optimization method which has been
suggested recently. We compare the numerical performance of a newly developed
numerical code based on the optimization method with the performance of another
code based on an MHD relaxation method if both codes are applied to the
reconstruction of a semi-analytic nonlinear force-free solution. The
optimization method has also been tested for cases where we add random noise to
the perfect boundary conditions of the analytic solution, in this way mimicking
the more realistic case where the boundary conditions are given by vector
magnetogram data. We find that the convergence properties of the optimization
method are affected by adding noise to the boundary data and we discuss
possibilities to overcome this difficulty.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:29:07 GMT"
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] | 2020-01-29T00:00:00 | [
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801.3216 | Dmitri Volchenkov | Ph. Blanchard, D. Volchenkov | Exploring Urban Environments By Random Walks | 17 pages, 12 figures | null | 10.1063/1.2956796 | null | physics.soc-ph physics.data-an | null | A complex web of roads, walkways and public transport systems can hide areas
of geographical isolation very difficult to analyze. Random walks are used to
spot the structural details of urban fabric.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:12:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Blanchard",
"Ph.",
""
],
[
"Volchenkov",
"D.",
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801.3217 | Martin Holtschneider | M. Holtschneider and W. Selke | Uniaxially anisotropic antiferromagnets in a field on a square lattice | 8 pages, 9 figures, submitted to Eur. Phys. J. B | null | 10.1140/epjb/e2008-00149-2 | null | cond-mat.stat-mech | null | Classical uniaxially anisotropic Heisenberg and XY antiferromagnets in a
field along the easy axis on a square lattice are analysed, applying ground
state considerations and Monte Carlo techniques. The models are known to
display antiferromagnetic and spin-flop phases. In the Heisenberg case, a
single-ion anisotropy is added to the XXZ antiferromagnet, enhancing or
competing with the uniaxial exchange anisotropy. Its effect on the stability of
non-collinear structures of biconical type is studied. In the case of the
anisotropic XY antiferromagnet, the transition region between the
antiferromagnetic and spin-flop phases is found to be dominated by degenerate
bidirectional fluctuations. The phase diagram is observed to resemble closely
that of the XXZ antiferromagnet without single-ion anisotropy.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 20:24:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Holtschneider",
"M.",
""
],
[
"Selke",
"W.",
""
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] |
801.3218 | Christian Huck | Christian Huck | A Note on Affinely Regular Polygons | 10 pages, 1 figure | European J. Combin. 30 (2009), 387-395 | 10.1016/j.ejc.2008.05.001 | null | math.MG | null | The affinely regular polygons in certain planar sets are characterized. It is
also shown that the obtained results apply to cyclotomic model sets and,
additionally, have consequences in the discrete tomography of these sets.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:19:04 GMT"
}
] | 2009-02-12T00:00:00 | [
[
"Huck",
"Christian",
""
]
] | [
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] |
801.3219 | Arnaud Belloche | A. Belloche, K. M. Menten, C. Comito, H. S. P. M\"uller, P. Schilke,
J. Ott, S. Thorwirth, C. Hieret | Detection of amino acetonitrile in Sgr B2(N) | 30 pages, 8 figures, accepted for publication in Astronomy and
Astrophysics (A&A). Version 2: minor changes (one author affiliation added,
one reference updated). Version 3: minor changes (typos) for final version | Astron. Astrophys. 482 (2008) 179-196 | 10.1051/0004-6361:20079203 | null | astro-ph | null | Amino acids are building blocks of proteins and therefore key ingredients for
the origin of life. The simplest amino acid, glycine, has long been searched
for in the interstellar medium but has not been unambiguously detected so far.
Since the search for glycine has turned out to be extremely difficult, we aimed
at detecting a chemically related species (possibly a direct precursor), amino
acetonitrile. With the IRAM 30m telescope we carried out a complete line survey
of the hot core regions Sgr B2(N) and (M) in the 3 mm range, plus partial
surveys at 2 and 1.3 mm. We analyzed our 30m line survey in the LTE
approximation and modeled the emission of all known molecules simultaneously.
We identified spectral features at the frequencies predicted for amino
acetonitrile lines having intensities compatible with a unique rotation
temperature. We also used the VLA to look for cold, extended emission from
amino acetonitrile. We detected amino acetonitrile in Sgr B2(N) in our 30m
telescope line survey and conducted confirmatory observations of selected lines
with the IRAM PdB and the ATCA interferometers. The emission arises from a
known hot core, the Large Molecule Heimat, and is compact with a source
diameter of 2 arcsec (0.08 pc). We derived a column density of 2.8e16 cm-2, a
temperature of 100 K, and a linewidth of 7 km s-1. Based on the simultaneously
observed continuum emission, we calculated a density of 1.7e8 cm-3, a mass of
2340 Msun, and an amino acetonitrile fractional abundance of 2.2e-9. The high
abundance and temperature may indicate that amino acetonitrile is formed by
grain surface chemistry. We did not detect any hot, compact amino acetonitrile
emission toward Sgr B2(M) or any cold, extended emission toward Sgr B2, with
column-density upper limits of 6e15 and 3e12-14 cm-2, respectively. (abridged)
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:20:52 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 09:20:31 GMT"
},
{
"version": "v3",
"created": "Tue, 4 Mar 2008 07:50:16 GMT"
}
] | 2014-08-25T00:00:00 | [
[
"Belloche",
"A.",
""
],
[
"Menten",
"K. M.",
""
],
[
"Comito",
"C.",
""
],
[
"Müller",
"H. S. P.",
""
],
[
"Schilke",
"P.",
""
],
[
"Ott",
"J.",
""
],
[
"Thorwirth",
"S.",
""
],
[
"Hieret",
"C.",
""
]
] | [
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801.322 | Nabil Youssef L | Nabil L. Youssef, S. H. Abed and A. Soleiman | A Global Approach to the Theory of Connections in Finsler Geometry | Tex file, 21 pages | Tensor, N. S., 71 (2009), 187-208 | null | null | math.DG gr-qc | null | Adopting the pullback approach to global Finsler geometry, the aim of the
present paper is to provide intrinsic (coordinate-free) proofs of the existence
and uniqueness theorems for the Chern (Rund) and Hashiguchi connections on a
Finsler manifold. To accomplish this, we introduce and investigate the notions
of semispray and nonlinear connection associated with a given regular
connection, in the pullback bundle. Moreover, it is shown that for the the
Chern (Rund) and Hashiguchi connections, the associated semispray coincides
with the canonical spray and the associated nonlinear connection coincides with
the Barthel connection. Explicit intrinsic expressions relating these
connections and the Cartan connection are deduced. Although our investigation
is entirely global, the local expressions of the obtained results, when
calculated, coincide with the existing classical local results. We provide, for
the sake of completeness and for comparison reasons, two appendices, one of
them presenting a global survey of canonical linear connections in Finsler
geometry and the other presenting a local survey of our global approach.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:21:45 GMT"
}
] | 2013-04-30T00:00:00 | [
[
"Youssef",
"Nabil L.",
""
],
[
"Abed",
"S. H.",
""
],
[
"Soleiman",
"A.",
""
]
] | [
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801.3221 | Lance Labun | Lance Labun and Marcelo Gleiser | Running-mode resonance in A.C.-biased periodic potential | 5 pages, 5 figures, submitted to Phys. Rev. E | null | null | null | cond-mat.stat-mech | null | We investigate the stochastic dynamics of a particle in the presence of a
modulated sinusoidal potential. Using the time derivative of the winding
number, we quantify the particle's motion according to its running time, the
time it runs monotonically to the left or right. For a range of model
parameters, we show that, in the overdamped regime, the particle's motion in
this modulated washboard potential exhibits stochastic resonance. We briefly
suggest possible applications of our results, including the amplification of
signals for measurement devices and in stimulated tunneling of Bose-Einstein
condensates.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 20:36:29 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Labun",
"Lance",
""
],
[
"Gleiser",
"Marcelo",
""
]
] | [
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] |
801.3222 | Vicent Mateu | A.V. Manohar and V. Mateu | Dispersion Relation Bounds for pi pi Scattering | 12 pages, 8 figures. Two references added, a few minor changes.
Published version | Phys.Rev.D77:094019,2008 | 10.1103/PhysRevD.77.094019 | IFIC/08-01, FTUV/07-0121 | hep-ph | null | Axiomatic principles such as analyticity, unitarity and crossing symmetry
constrain the second derivative of the pi pi scattering amplitudes in some
channels to be positive in a region of the Mandelstam plane. Since this region
lies in the domain of validity of chiral perturbation theory, we can use these
positivity conditions to bound linear combinations of \bar{l}_1 and \bar{l}_2.
We compare our predictions with those derived previously in the literature
using similar methods. We compute the one-loop pi pi scattering amplitude in
the linear sigma model (LSM) using the MS-bar scheme, a result hitherto absent
in the literature. The LSM values for \bar{l}_1 and \bar{l}_2 violate the
bounds for small values of m_sigma/m_pi. We show how this can occur, while
still being consistent with the axiomatic principles.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:29:33 GMT"
},
{
"version": "v2",
"created": "Mon, 26 May 2008 13:30:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Manohar",
"A. V.",
""
],
[
"Mateu",
"V.",
""
]
] | [
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801.3223 | Irina Pirozhenko G. | I. G. Pirozhenko and A. Lambrecht | Casimir repulsion and metamaterials | 12 pages, 5 figures, contributed to 8th Workshop on Quantum Field
Theory Under the Influence of External Conditions (QFEXT07), Leipzig,
Germany, 17-21 Sep 2007, v2, typos corrected | J.Phys.A41:164015,2008 | 10.1088/1751-8113/41/16/164015 | null | quant-ph hep-th | null | We analyze the conditions for getting the Casimir repulsion between two
nonequal plates. The force between plates with magnetic permeability defined by
Drude or Lorentz models is calculated. The short and long distance limits of
the force are derived. The Casimir set-up with the hypothetical perfect
matching metamaterial is discussed. We put into question the possibility of
getting repulsion within the design of metamaterials based on metallic
inclusions.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:57:34 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Feb 2008 11:19:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pirozhenko",
"I. G.",
""
],
[
"Lambrecht",
"A.",
""
]
] | [
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] |
801.3224 | Alessandra Lunardi | Matthias Geissert, Alessandra Lunardi | Invariant Measures and Maximal L^2 Regularity for Nonautonomous
Ornstein-Uhlenbeck Equations | null | null | 10.1112/jlms/jdn009 | null | math.AP | null | We characterize the domain of the realization of the linear parabolic
operator Gu := u_t + L(t)u (where, for each real t, L(t) is an
Ornstein-Uhlenbeck operator), in L^2 spaces with respect to a suitable measure,
that is invariant for the associated evolution semigroup. As a byproduct, we
obtain optimal L^2 regularity results for evolution equations with
time-depending Ornstein-Uhlenbeck operators.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:34:45 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Geissert",
"Matthias",
""
],
[
"Lunardi",
"Alessandra",
""
]
] | [
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] |
801.3225 | Iskander A. Taimanov | I.A. Taimanov, S.P. Tsarev | Two-dimensional rational solitons and their blow-up via the Moutard
transformation | 22 pages, PDFLatex, 9 figures. v2: some computations corrected | Theoret. and Math. Phys. 157 (2007), 1525-1541 | 10.1007/s11232-008-0127-3 | null | math-ph math.MP | null | By using the Moutard transformation of two-dimensional Schroedinger operators
we derive a procedure for constructing explicit examples of such operators with
rational fast decaying potentials and degenerate $L_2$-kernels (this
construction was sketched in arXiv:0706.3595) and show that if we take some of
these potentials as the Cauchy data for the Novikov-Veselov equation (a
two-dimensional version of the Korteweg-de Vries equation), then the
corresponding solutions blow up in a finite time
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:19:57 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 16:09:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Taimanov",
"I. A.",
""
],
[
"Tsarev",
"S. P.",
""
]
] | [
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] |
801.3226 | Rory Barnes | Rory Barnes (Arizona), Richard Greenberg (Arizona) | Extrasolar Planet Interactions | 10 pages, 3 figures, 1 table. To appear in the proceedings of IAU
Symposium 249: Exoplanets: Detection, Formation and Dynamics, held in Suzhou,
China, Oct 22-26 2007. A version with full resolution figures is available at
http://www.lpl.arizona.edu/~rory/publications/bg08a.pdf | null | 10.1017/S1743921308016980 | null | astro-ph | null | The dynamical interactions of planetary systems may be a clue to their
formation histories. Therefore, the distribution of these interactions provides
important constraints on models of planet formation. We focus on each system's
apsidal motion and proximity to dynamical instability. Although only ~25
multiple planet systems have been discovered to date, our analyses in these
terms have revealed several important features of planetary interactions. 1)
Many systems interact such that they are near the boundary between stability
and instability. 2) Planets tend to form such that at least one planet's
eccentricity periodically drops to near zero. 3) Mean-motion resonant pairs
would be unstable if not for the resonance. 4) Scattering of approximately
equal mass planets is unlikely to produce the observed distribution of apsidal
behavior. 5) Resonant interactions may be identified through calculating a
system's proximity to instability, regardless of knowledge of angles such as
mean longitude and longitude of periastron (e.g. GJ 317 b and c are probably in
a 4:1 resonance). These properties of planetary systems have been identified
through calculation of two parameters that describe the interaction. The
apsidal interaction can be quantified by determining how close a planet is to
an apsidal separatrix (a boundary between qualitatively different types of
apsidal oscillations, e.g. libration or circulation of the major axes). The
proximity to instability can be measured by comparing the observed orbital
elements to an analytic boundary that describes a type of stability known as
Hill stability. We have set up a website dedicated to presenting the most
up-to-date information on dynamical interactions:
http://www.lpl.arizona.edu/~rory/research/xsp/dynamics
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:55:05 GMT"
}
] | 2019-02-13T00:00:00 | [
[
"Barnes",
"Rory",
"",
"Arizona"
],
[
"Greenberg",
"Richard",
"",
"Arizona"
]
] | [
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] |
801.3227 | Jeffrey Boerner | Jeffrey Boerner | A New Perspective for an Existing Homology Theory of Links Embedded in
I-Bundles | pdflatex, 24 pages, 54 figures | null | null | null | math.GT | null | This paper introduces a homology theory for links in I-bundles over an
orientable surface. The theory is unique in that the elements of the chain
groups are surfaces instead of diagrams. It is then shown this theory yields
the same results as the homology theory constructed by Asaeda, Przytycki and
Sikora.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:59:44 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Boerner",
"Jeffrey",
""
]
] | [
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] |
801.3228 | Alastair Kay | Alastair Kay | The Computational Power of Symmetric Hamiltonians | 8 pages, 4 figures v3: much clearer presentation of main
construction. Results extended to rotationally invariant Hamiltonians | Phys. Rev. A 78, 012346 (2008) | 10.1103/PhysRevA.78.012346 | null | quant-ph | null | The presence of symmetries, be they discrete or continuous, in a physical
system typically leads to a reduction in the problem to be solved. Here we
report that neither translational invariance nor rotational invariance reduce
the computational complexity of simulating Hamiltonian dynamics; the problem is
still BQP complete, and is believed to be hard on a classical computer. This is
achieved by designing a system to implement a Universal Quantum Interface, a
device which enables control of an entire computation through the control of a
fixed number of spins, and using it as a building-block to entirely remove the
need for control, except in the system initialisation. Finally, it is shown
that cooling such Hamiltonians to their ground states in the presence of random
magnetic fields solves a QMA-complete problem.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:00:28 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 17:07:27 GMT"
},
{
"version": "v3",
"created": "Mon, 17 Mar 2008 11:37:37 GMT"
}
] | 2008-07-24T00:00:00 | [
[
"Kay",
"Alastair",
""
]
] | [
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] |
801.3229 | Judith Pfeiffer | J. Pfeiffer, M. Kemmler, D. Koelle, R. Kleiner, E. Goldobin, M.
Weides, A. K. Feofanov, J. Lisenfeld, and A. V. Ustinov | Static and dynamic properties of 0, pi, and 0-pi ferromagnetic tunnel
Josephson Junctions | 9 pages, 7 figures, 1 table | Phys. Rev. B 77, 214506 (2008) | 10.1103/PhysRevB.77.214506 | null | cond-mat.supr-con | null | We present experimental studies of static and dynamic properties of 0, pi and
0-pi superconductor-insulator-ferromagnet-superconductor (SIFS) Josephson
junctions of small and intermediate length. In the underdamped limit these
junctions exhibit a rich dynamical behavior such as resonant steps on the
current-voltage characteristics. Varying the experimental conditions, zero
field steps, Fiske steps and Shapiro steps are observed with a high resolution.
A strong signature of the 0-pi Josephson junction is demonstrated by measuring
the critical current as a function of two components (B_x, B_y) of an in-plane
magnetic field. The experimental observation of a half-integer zero field step
in 0-pi SIFS junctions is presented.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:05:38 GMT"
}
] | 2008-06-16T00:00:00 | [
[
"Pfeiffer",
"J.",
""
],
[
"Kemmler",
"M.",
""
],
[
"Koelle",
"D.",
""
],
[
"Kleiner",
"R.",
""
],
[
"Goldobin",
"E.",
""
],
[
"Weides",
"M.",
""
],
[
"Feofanov",
"A. K.",
""
],
[
"Lisenfeld",
"J.",
""
],
[
"Ustinov",
"A. V.",
""
]
] | [
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] |
801.323 | Ignasi Ribas | Ignasi Ribas (ICE/CSIC-IEEC, Spain), Andreu Font-Ribera
(ICE/CSIC-IEEC, Spain), Jean-Philippe Beaulieu (IAP, France) | A ~5 M_earth Super-Earth Orbiting GJ 436?: The Power of Near-Grazing
Transits | 5 pages, 3 figures, accepted for publication in The Astrophysical
Journal Letters | null | 10.1086/587961 | null | astro-ph | null | Most of the presently identified exoplanets have masses similar to that of
Jupiter and therefore are assumed to be gaseous objects. With the
ever-increasing interest in discovering lower-mass planets, several of the
so-called super-Earths (1 M_earth<M<10 M_earth), which are predicted to be
rocky, have already been found. Here we report the possible discovery of a
planet around the M-type star GJ 436 with a minimum mass of 4.7+/-0.6 M_earth
and a true mass of ~5 M_earth, which would make it the least massive planet
around a main-sequence star found to date. The planet is identified from its
perturbations on an inner Neptune-mass transiting planet (GJ 436b), by pumping
eccentricity and producing variations in the orbital inclination. Analysis of
published radial velocity measurements indeed reveals a significant signal
corresponding to an orbital period that is very close to the 2:1 mean motion
resonance with the inner planet. The near-grazing nature of the transit makes
it extremely sensitive to small changes in the inclination.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:06:16 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 07:00:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ribas",
"Ignasi",
"",
"ICE/CSIC-IEEC, Spain"
],
[
"Font-Ribera",
"Andreu",
"",
"ICE/CSIC-IEEC, Spain"
],
[
"Beaulieu",
"Jean-Philippe",
"",
"IAP, France"
]
] | [
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] |
801.3231 | Ian Appelbaum | Jing Li, Biqin Huang, and Ian Appelbaum | Oblique Hanle Effect in Semiconductor Spin Transport Devices | null | Appl. Phys. Lett. 92, 142507 (2008) | 10.1063/1.2907497 | null | cond-mat.mtrl-sci cond-mat.other | null | Spin precession and dephasing ("Hanle effect") provides an unambiguous means
to establish the presence of spin transport in semiconductors. We compare
theoretical modeling with experimental data from drift-dominated silicon
spin-transport devices, illustrating the non-trivial consequences of employing
oblique magnetic fields (due to misalignment or intentional, fixed in-plane
field components) to measure the effects of spin precession. Model results are
also calculated for Hanle measurements under conditions of diffusion-dominated
transport, revealing an expected Hanle peak-widening effect induced by the
presence of fixed in-plane magnetic bias fields.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:08:44 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Mar 2008 18:52:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Li",
"Jing",
""
],
[
"Huang",
"Biqin",
""
],
[
"Appelbaum",
"Ian",
""
]
] | [
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] |
801.3232 | Massimiliano Grazzini | M. Grazzini | NNLO predictions for the Higgs boson signal in the H->WW->lnu lnu and
H->ZZ->4l decay channels | References added. Version published on JHEP | JHEP 0802:043,2008 | 10.1088/1126-6708/2008/02/043 | null | hep-ph hep-ex | null | We consider Standard Model Higgs boson production by gluon--gluon fusion in
hadron collisions. We present a calculation of the next-to-next-to-leading
order QCD corrections to the cross section in the H->WW->lnu lnu and H->ZZ->4l
decay channels. The calculation is implemented in the parton level Monte Carlo
program HNNLO and allows us to apply arbitrary cuts on the final state leptons
and the associated jet activity. We present selected numerical results for the
signal cross section at the LHC, by using all the nominal cuts proposed for the
forthcoming Higgs boson search.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:39:49 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Feb 2008 11:03:17 GMT"
}
] | 2008-12-30T00:00:00 | [
[
"Grazzini",
"M.",
""
]
] | [
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801.3233 | Amnon Yekutieli | Amnon Yekutieli | Twisted Deformation Quantization of Algebraic Varieties (Survey) | Lecture notes made into a survey article. 19 pages. To appear in
Cont. Math. (Goodearl Conference Proceedings) | null | null | null | math.AG math.QA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let X be a smooth algebraic variety over a field of characteristic 0. We
introduce the notion of twisted associative (resp. Poisson) deformation of the
structure sheaf O_X. These are stack-like versions of usual deformations. We
prove that there is a twisted quantization map from twisted Poisson
deformations to twisted associative deformations, which is canonical and
bijective on equivalence classes.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:09:33 GMT"
},
{
"version": "v2",
"created": "Sun, 14 Dec 2008 18:16:21 GMT"
},
{
"version": "v3",
"created": "Sun, 5 Dec 2010 10:09:34 GMT"
},
{
"version": "v4",
"created": "Wed, 27 Jul 2011 06:39:45 GMT"
}
] | 2011-07-28T00:00:00 | [
[
"Yekutieli",
"Amnon",
""
]
] | [
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801.3234 | Thomas Wiegelmann | T. Wiegelmann and T. Neukirch | Including stereoscopic information in the reconstruction of coronal
magnetic fields | 18 pages, 7 figures | Solar Phys.208:233-251,2002 | 10.1023/A:1020537403934 | null | astro-ph | null | We present a method to include stereoscopic information about the three
dimensional structure of flux tubes into the reconstruction of the coronal
magnetic field. Due to the low plasma beta in the corona we can assume a force
free magnetic field, with the current density parallel to the magnetic field
lines. Here we use linear force free fields for simplicity. The method uses the
line of sight magnetic field on the photosphere as observational input. The
value of $\alpha$ is determined iteratively by comparing the reconstructed
magnetic field with the observed structures. The final configuration is the
optimal linear force solution constrained by both the photospheric magnetogram
and the observed plasma structures. As an example we apply our method to SOHO
MDI/EIT data of an active region. In the future it is planned to apply the
method to analyse data from the SECCHI instrument aboard the STEREO mission.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:36:39 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jan 2008 13:18:21 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Wiegelmann",
"T.",
""
],
[
"Neukirch",
"T.",
""
]
] | [
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] |
801.3235 | Vadim Guzey | V. Guzey (Jefferson Lab) | Neutron contribution to nuclear DVCS asymmetries | 24 pages, 7 figures | Phys.Rev.C78:025211,2008 | 10.1103/PhysRevC.78.025211 | JLAB-THY-08-767 | nucl-th hep-ex hep-ph | null | Using a simple model for nuclear GPDs, we study the role of the neutron
contribution to nuclear DVCS observables. As an example, we use the beam-spin
asymmetry A_{LU}^A measured in coherent and incoherent DVCS on a wide range of
nuclear targets in the HERMES and JLab kinematics. We find that at small values
of the momentum transfer t, A_{LU}^A is dominated by the coherent-enriched
contribution, which enhances A_{LU}^A compared to the free proton asymmetry
A_{LU}^p, A_{LU}^A(\phi)/A_{LU}^p(\phi)=1.8-2.2. At large values of t, the
nuclear asymmetry is dominated by the incoherent contribution and
A_{LU}^A/(\phi)A_{LU}^p(\phi)=0.66-0.74. The deviation of
A_{LU}^A(\phi)/A_{LU}^p(\phi) from unity at large t is a result of the neutron
contribution, which gives a possibility to constain neutron GPDs in incoherent
nuclear DVCS. A similar trend is expected for other DVCS asymmetries.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:18:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Guzey",
"V.",
"",
"Jefferson Lab"
]
] | [
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] |
801.3236 | Su-Jeong Kang | Su-Jeong Kang, James D. Lewis | Beilinson's Hodge Conjecture for K_1 revisited | 13 pages | null | null | null | math.AG | null | Let U be a smooth quasiprojective complex variety and CH^r(U,1) a special
instance of Bloch's higher Chow groups. Jannsen was the first to show that the
cycle class map cl_{r,1} from CH^r(U,1) (tensored with Q) to hom_{MHS}(Q(0),
H^{2r-1}(U,Q(r)) is not in general surjective, contradicting an earlier
conjecture of Beilinson. In this paper, we give a refinement of Jannsen's
counterexample, and further show that the aforementioned cycle class map
becomes surjective at the generic point.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:27:58 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Kang",
"Su-Jeong",
""
],
[
"Lewis",
"James D.",
""
]
] | [
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] |
801.3237 | Thomas Wiegelmann | B. Inhester and T. Wiegelmann | Nonlinear force-free magnetic field extrapolations: comparison of the
Grad-Rubin and Wheatland-Sturrock-Roumeliotis algorithm | 21 pages, 13 figures | 2006SoPh..235..201I | 10.1007/s11207-006-0065-x | null | astro-ph | null | We compare the performance of two alternative algorithms which aim to
construct a force-free magnetic field given suitable boundary conditions. For
this comparison, we have implemented both algorithms on the same finite element
grid which uses Whitney forms to describe the fields within the grid cells. The
additional use of conjugate gradient and multigrid iterations result in quite
effective codes. The Grad-Rubin and Wheatland-Sturrock-Roumeliotis algorithms
both perform well for the reconstruction of a known analytic force-free field.
For more arbitrary boundary conditions the Wheatland-Sturrock-Roumeliotis
approach has some difficulties because it requires overdetermined boundary
information which may include inconsistencies. The Grad-Rubin code on the other
hand loses convergence for strong current densities. For the example we have
investigated, however, the maximum possible current density seems to be not far
from the limit beyond which a force free field cannot exist anymore for a given
normal magnetic field intensity on the boundary.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:33:22 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jan 2008 13:23:50 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Inhester",
"B.",
""
],
[
"Wiegelmann",
"T.",
""
]
] | [
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] |
801.3238 | Cristian Degli Esposti Boschi | M. Roncaglia, L. Campos Venuti, C. Degli Esposti Boschi | Rapidly-converging methods for the location of quantum critical points
from finite-size data | 9 pages, 2 EPS figures, RevTeX style. Updated to published version | Phys. Rev. B 77, 155413 (2008) | 10.1103/PhysRevB.77.155413 | null | cond-mat.stat-mech hep-th quant-ph | null | We analyze in detail, beyond the usual scaling hypothesis, the finite-size
convergence of static quantities toward the thermodynamic limit. In this way we
are able to obtain sequences of pseudo-critical points which display a faster
convergence rate as compared to currently used methods. The approaches are
valid in any spatial dimension and for any value of the dynamic exponent. We
demonstrate the effectiveness of our methods both analytically on the basis of
the one dimensional XY model, and numerically considering c = 1 transitions
occurring in non integrable spin models. In particular, we show that these
general methods are able to locate precisely the onset of the
Berezinskii-Kosterlitz-Thouless transition making only use of ground-state
properties on relatively small systems.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:39:18 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Apr 2008 10:36:14 GMT"
}
] | 2008-04-10T00:00:00 | [
[
"Roncaglia",
"M.",
""
],
[
"Venuti",
"L. Campos",
""
],
[
"Boschi",
"C. Degli Esposti",
""
]
] | [
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] |
801.3239 | Andrij Rovenchak | Solomiya Buk, Andrij Rovenchak | Online-concordance "Perekhresni stezhky" ("The Cross-Paths"), a novel by
Ivan Franko | in Ukrainian | Ivan Franko: Spirit, Science, Thought, Will (Proceedings of the
International Scientific Congress dedicated to the 150th anniversary (Lviv,
27 September -- 1 October 2006, Lviv University Press, Vol. 2, pp. 203-211,
2010) | null | null | cs.CL cs.DL | null | In the article, theoretical principles and practical realization for the
compilation of the concordance to "Perekhresni stezhky" ("The Cross-Paths"), a
novel by Ivan Franko, are described. Two forms for the context presentation are
proposed. The electronic version of this lexicographic work is available
online.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:41:57 GMT"
}
] | 2014-01-17T00:00:00 | [
[
"Buk",
"Solomiya",
""
],
[
"Rovenchak",
"Andrij",
""
]
] | [
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] |
801.324 | Thomas Wiegelmann | B. Inhester, L. Feng, T. Wiegelmann | Segmentation of Loops from Coronal EUV Images | 13 pages, 9 figures, Solar Physics, online first | null | 10.1007/s11207-007-9027-1 | null | astro-ph | null | We present a procedure which extracts bright loop features from solar EUV
images. In terms of image intensities, these features are elongated ridge-like
intensity maxima. To discriminate the maxima, we need information about the
spatial derivatives of the image intensity. Commonly, the derivative estimates
are strongly affected by image noise. We therefore use a regularized estimation
of the derivative which is then used to interpolate a discrete vector field of
ridge points ``ridgels'' which are positioned on the ridge center and have the
intrinsic orientation of the local ridge direction. A scheme is proposed to
connect ridgels to smooth, spline-represented curves which fit the observed
loops. Finally, a half-automated user interface allows one to merge or split,
eliminate or select loop fits obtained form the above procedure. In this paper
we apply our tool to one of the first EUV images observed by the SECCHI
instrument onboard the recently launched STEREO spacecraft. We compare the
extracted loops with projected field lines computed from
almost-simultaneously-taken magnetograms measured by the SOHO/MDI Doppler
imager. The field lines were calculated using a linear force-free field model.
This comparison allows one to verify faint and spurious loop connections
produced by our segmentation tool and it also helps to prove the quality of the
magnetic-field model where well-identified loop structures comply with
field-line projections. We also discuss further potential applications of our
tool such as loop oscillations and stereoscopy.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 17:53:08 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Inhester",
"B.",
""
],
[
"Feng",
"L.",
""
],
[
"Wiegelmann",
"T.",
""
]
] | [
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] |
801.3241 | Alexander Knebe | Kristin Warnick (AIP), Alexander Knebe (AIP), Chris Power (Leicester) | The Tidal Streams of Disrupting Subhaloes in Cosmological Dark Matter
Haloes | 27 pages, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.12992.x | null | astro-ph | null | (abridged) We present a detailed analysis of the properties of tidally
stripped material from disrupting substructure haloes or subhaloes in a sample
of high resolution cosmological N-body host haloes ranging from galaxy- to
cluster-mass scales. We focus on devising methods to recover the infall mass
and infall eccentricity of subhaloes from the properties of their tidally
stripped material (i.e. tidal streams). Our analysis reveals that there is a
relation between the scatter of stream particles about the best-fit debris
plane and the infall mass of the progenitor subhalo. This allows us to
reconstruct the infall mass from the spread of its tidal debris in space. We
also find that the spread in radial velocities of the debris material (as
measured by an observer located at the centre of the host) correlates with the
infall eccentricity of the subhalo, which allows us to reconstruct its orbital
parameters. We devise an automated method to identify leading and trailing arms
that can, in principle at least, be applied to observations of stellar streams
from satellite galaxies. This method is based on the energy distribution of
material in the tidal stream. Using this method, we show that the mass
associated with leading and trailing arms differ. While our analysis indicates
that tidal streams can be used to recover certain properties of their
progenitor subhaloes (and consequently satellites), we do not find strong
correlations between host halo properties and stream properties. This likely
reflects the complicated relationship between the stream and the host, which in
a cosmological context is characterised by a complex mass accretion history, an
asymmetric mass distribution and the abundance of substructure. [...]
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 14:55:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Warnick",
"Kristin",
"",
"AIP"
],
[
"Knebe",
"Alexander",
"",
"AIP"
],
[
"Power",
"Chris",
"",
"Leicester"
]
] | [
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] |
801.3242 | Niels Kj{\ae}rgaard | Patrick Windpassinger, Daniel Oblak, Ulrich Busk Hoff, Juergen Appel,
Niels Kjaergaard, and Eugene S. Polzik | Inhomogeneous Light Shift Effects on Atomic Quantum State Evolution in
Non-Destructive Measurements | 9 pages, 7 figures, updated introduction and reference list | New J. Phys. 10 (2008) 053032 | 10.1088/1367-2630/10/5/053032 | null | quant-ph | null | Various parameters of a trapped collection of cold and ultracold atoms can be
determined non--destructively by measuring the phase shift of an off--resonant
probe beam, caused by the state dependent index of refraction of the atoms. The
dispersive light--atom interaction, however, gives rise to a differential light
shift (AC Stark shift) between the atomic states which, for a nonuniform probe
intensity distribution, causes an inhomogeneous dephasing between the atoms. In
this paper, we investigate the effects of this inhomogeneous light shift in
non--destructive measurement schemes. We interpret our experimental data on
dispersively probed Rabi oscillations and Ramsey fringes in terms of a simple
light shift model which is shown to describe the observed behavior well.
Furthermore, we show that by using spin echo techniques, the inhomogeneous
phase shift distribution between the two clock levels can be reversed.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 18:05:41 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 17:06:17 GMT"
}
] | 2008-05-29T00:00:00 | [
[
"Windpassinger",
"Patrick",
""
],
[
"Oblak",
"Daniel",
""
],
[
"Hoff",
"Ulrich Busk",
""
],
[
"Appel",
"Juergen",
""
],
[
"Kjaergaard",
"Niels",
""
],
[
"Polzik",
"Eugene S.",
""
]
] | [
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] |
801.3243 | Rui Pereira | Lu\'isa Arruda, Fernando Bar\~ao, Rui Pereira | Particle identification with the AMS-02 RICH detector: D/p and
anti-D/anti-p separation | 5 pages. Contribution to the Sixth International Workshop on New
Worlds in Astroparticle Physics (Faro 2007). Presenter: Rui Pereira | null | null | null | astro-ph | null | The Alpha Magnetic Spectrometer (AMS), whose final version AMS-02 is to be
installed on the International Space Station (ISS) for at least 3 years, is a
detector designed to measure charged cosmic ray spectra with energies up to the
TeV region and with high energy photon detection capability up to a few hundred
GeV, using state-of-the art particle identification techniques. Among several
detector subsystems, AMS includes a proximity focusing RICH enabling precise
measurements of particle electric charge and velocity. The combination of both
these measurements together with the particle rigidity measured on the silicon
tracker endows a reliable measurement of the particle mass. The main topics of
the AMS-02 physics program include detailed measurements of the nuclear
component of the cosmic-ray spectrum and the search for indirect signatures of
dark matter. Mass separation of singly charged particles, and in particular the
separation of deuterons and antideuterons from massive backgrounds of protons
and antiprotons respectively, is essential in this context. Detailed Monte
Carlo simulations of AMS-02 have been used to evaluate the detector's
performance for mass separation at different energies. The obtained results and
physics prospects are presented.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 18:09:25 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Arruda",
"Luísa",
""
],
[
"Barão",
"Fernando",
""
],
[
"Pereira",
"Rui",
""
]
] | [
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] |
801.3244 | Davide Pini | D. Pini, F. Lo Verso, M. Tau, A. Parola, and L. Reatto | Nonuniversal routes to universality: Critical phenomena in colloidal
dispersions | 4 pages, 3 figures | null | 10.1103/PhysRevLett.100.055703 | null | cond-mat.soft cond-mat.stat-mech | null | We investigate critical phenomena in colloids by means of the
renormalization-group based hierarchical reference theory of fluids (HRT). We
focus on three experimentally relevant model systems: namely, the
Asakura-Oosawa model of a colloidal dispersion under the influence of
polymer-induced attractive depletion forces; fluids with competing short-range
attractive and longer-range repulsive interactions; solutions of star-polymers
whose pair potential presents both an attractive well and an ultrasoft
repulsion at shorter distance. Our results show that the ability to tune the
effective interactions between colloidal particles allows one to generate a
variety of crossovers to the asymptotic critical behavior, which are not
observed in atomic fluids.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 18:13:16 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Apr 2008 10:56:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pini",
"D.",
""
],
[
"Verso",
"F. Lo",
""
],
[
"Tau",
"M.",
""
],
[
"Parola",
"A.",
""
],
[
"Reatto",
"L.",
""
]
] | [
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-0.0381569229,
-0.0034256552,
-0.1005885229,
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] |
801.3245 | Thomas Bauer | Thomas Bauer, Tomasz Szemberg | Seshadri constants on surfaces of general type | null | null | null | null | math.AG | null | We study Seshadri constants of the canonical bundle on minimal surfaces of
general type. First, we prove that if the Seshadri constant $\eps(K_X,x)$ is
between 0 and 1, then it is of the form $(m-1)/m$ for some integer $m\ge 2$.
Secondly, we study values of $\eps(K_X,x)$ for a very general point $x$ and
show that small values of the Seshadri constant are accounted for by the
geometry of $X$.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 20:10:00 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Bauer",
"Thomas",
""
],
[
"Szemberg",
"Tomasz",
""
]
] | [
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0.0718275383,
-0.0240467191,
-0.0030636746,
-0.1150441095,
-0.0225836579
] |
801.3246 | Sergei Suslov K | Ricardo Cordero-Soto, Raquel M. Lopez, Erwin Suazo, and Sergei K.
Suslov | Propagator of a Charged Particle with a Spin in Uniform Magnetic and
Perpendicular Electric Fields | 17 pages, no figures | null | 10.1007/s11005-008-0239-6 | null | math-ph math.MP | null | We construct an explicit solution of the Cauchy initial value problem for the
time-dependent Schroedinger equation for a charged particle with a spin moving
in a uniform magnetic field and a perpendicular electric field varying with
time. The corresponding Green function (propagator) is given in terms of
elementary functions and certain integrals of the fields with a characteristic
function, which should be found as an analytic or numerical solution of the
equation of motion for the classical oscillator with a time-dependent
frequency. We discuss a particular solution of a related nonlinear Schroedinger
equation and some special and limiting cases are outlined.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 18:15:53 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jan 2008 01:49:28 GMT"
},
{
"version": "v3",
"created": "Mon, 28 Jan 2008 14:41:46 GMT"
},
{
"version": "v4",
"created": "Wed, 30 Jan 2008 16:55:31 GMT"
},
{
"version": "v5",
"created": "Thu, 31 Jan 2008 17:52:39 GMT"
},
{
"version": "v6",
"created": "Tue, 5 Feb 2008 20:21:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cordero-Soto",
"Ricardo",
""
],
[
"Lopez",
"Raquel M.",
""
],
[
"Suazo",
"Erwin",
""
],
[
"Suslov",
"Sergei K.",
""
]
] | [
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] |
801.3247 | Dmitri Karasev | D. I. Karasev, S. S. Tsygankov, A. A. Lutovinov (Space Research
Institute, Moscow, Russia) | Discovery of X-ray Pulsations from the HMXB Source AXJ1749.1-2733 | MNRAS, 6 pages, 6 figures | null | 10.1111/j.1745-3933.2008.00449.x | null | astro-ph | null | We are reporting a discovery of X-ray pulsations from the source AX
J1749.1-2733 with the period of ~132 s based on the XMM-Newton data obtained in
March 2007. The observed pulse profile has a double-peaked structure with the
pulse fraction of about 25-30 % in the 3-10 keV energy band. We have also found
that a periodicity with practically the same period has been detected from the
source by the IBIS telescope onboard the INTEGRAL observatory during an
outburst on Sept. 9, 2003 in the 20-50 keV energy band. Due to the
double-peaked pulse profile, there is an additional peak on both periodograms
of nearly ~66 s, therefore we have also investigated the possibility that the
last value is the true pulse period. The source spectrum obtained by the
XMM-Newton observatory in the soft energy band is being heavily absorbed
($N_H\simeq2\times10^{23}$ cm$^{-2}$) due to a strong intrinsic absorption in
the binary system that leads to the conclusion that AX J1749.1-2733 is a new
transient X-ray pulsar in the high mass X-ray binary system.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 18:15:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Karasev",
"D. I.",
"",
"Space Research\n Institute, Moscow, Russia"
],
[
"Tsygankov",
"S. S.",
"",
"Space Research\n Institute, Moscow, Russia"
],
[
"Lutovinov",
"A. A.",
"",
"Space Research\n Institute, Moscow, Russia"
]
] | [
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] |
801.3248 | Zhou Zhang | Zhou Zhang | Scalar Curvature Bound for K\"ahler-Ricci Flows over Minimal Manifolds
of General Type | A short note | null | null | null | math.DG | null | In this short note, we use classic computations for K\"ahler-Ricci flow to
achieve scalar curvature bound for minimal manifold of general type.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 18:24:22 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Zhang",
"Zhou",
""
]
] | [
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] |
801.3249 | Christian Kuehn | Christian Kuehn | Complex Eigenvalues for Binary Subdivision Schemes | 7 pages, 2 figures | null | null | null | cs.GR cs.NA | null | Convergence properties of binary stationary subdivision schemes for curves
have been analyzed using the techniques of z-transforms and eigenanalysis.
Eigenanalysis provides a way to determine derivative continuity at specific
points based on the eigenvalues of a finite matrix. None of the well-known
subdivision schemes for curves have complex eigenvalues. We prove when a
convergent scheme with palindromic mask can have complex eigenvalues and that a
lower limit for the size of the mask exists in this case. We find a scheme with
complex eigenvalues achieving this lower bound. Furthermore we investigate this
scheme numerically and explain from a geometric viewpoint why such a scheme has
not yet been used in computer-aided geometric design.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 18:27:09 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Kuehn",
"Christian",
""
]
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801.325 | Rui Pereira | Rui Pereira, M. Aguilar-Benitez, L. Arruda, F. Barao, B. Baret, A.
Barrau, G. Barreira, E. Belmont, J. Berdugo, J. Borges, M. Buenerd, D.
Casadei, J. Casaus, E. Cortina, M. Costado, D. Crespo, C. Delgado, C. Diaz,
L. Derome, P. Goncalves, R. Garcia-Lopez, C. de la Guia, A. Herrero, E.
Lanciotti, G. Laurenti, A. Malinin, C. Mana, J. Marin, M. Mangin-Brinet, G.
Martinez, A. Menchaca-Rocha, C. Palomares, M. Pimenta, A. Putze, Y.
Sallaz-Damaz, E.S. Seo, I. Sevilla, A. Torrento, M. Vargas-Trevino, O.
Veziant | The RICH detector of the AMS-02 experiment: status and physics prospects | 5 pages. Contribution to the 10th ICATPP Conference on Astroparticle,
Particle, Space Physics, Detectors and Medical Physics Applications (Como
2007). Presenter: Rui Pereira | null | 10.1142/9789812819093_0151 | null | astro-ph | null | The Alpha Magnetic Spectrometer (AMS), whose final version AMS-02 is to be
installed on the International Space Station (ISS) for at least 3 years, is a
detector designed to measure charged cosmic ray spectra with energies up to the
TeV region and with high energy photon detection capability up to a few hundred
GeV. It is equipped with several subsystems, one of which is a proximity
focusing RICH detector with a dual radiator (aerogel+NaF) that provides
reliable measurements for particle velocity and charge. The assembly and
testing of the AMS RICH is currently being finished and the full AMS detector
is expected to be ready by the end of 2008. The RICH detector of AMS-02 is
presented. Physics prospects are briefly discussed.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 18:36:39 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Pereira",
"Rui",
""
],
[
"Aguilar-Benitez",
"M.",
""
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[
"Arruda",
"L.",
""
],
[
"Barao",
"F.",
""
],
[
"Baret",
"B.",
""
],
[
"Barrau",
"A.",
""
],
[
"Barreira",
"G.",
""
],
[
"Belmont",
"E.",
""
],
[
"Berdugo",
"J.",
""
],
[
"Borges",
"J.",
""
],
[
"Buenerd",
"M.",
""
],
[
"Casadei",
"D.",
""
],
[
"Casaus",
"J.",
""
],
[
"Cortina",
"E.",
""
],
[
"Costado",
"M.",
""
],
[
"Crespo",
"D.",
""
],
[
"Delgado",
"C.",
""
],
[
"Diaz",
"C.",
""
],
[
"Derome",
"L.",
""
],
[
"Goncalves",
"P.",
""
],
[
"Garcia-Lopez",
"R.",
""
],
[
"de la Guia",
"C.",
""
],
[
"Herrero",
"A.",
""
],
[
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"E.",
""
],
[
"Laurenti",
"G.",
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"M.",
""
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[
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""
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[
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"A.",
""
],
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"C.",
""
],
[
"Pimenta",
"M.",
""
],
[
"Putze",
"A.",
""
],
[
"Sallaz-Damaz",
"Y.",
""
],
[
"Seo",
"E. S.",
""
],
[
"Sevilla",
"I.",
""
],
[
"Torrento",
"A.",
""
],
[
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"M.",
""
],
[
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"O.",
""
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] | [
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801.3251 | Sergio del Campo | Sergio del Campo and Ramon Herrera | Tachyon-Chaplygin inflationary universe model | 13 pages, 1 figure, Accepted by Physics Letters B | Phys.Lett.B660:282-286,2008 | 10.1016/j.physletb.2008.01.016 | null | astro-ph gr-qc hep-ph hep-th | null | Tachyonic inflationary universe model in the context of a Chaplygin gas
equation of state is studied. General conditions for this model to be
realizable are discussed. By using an effective exponential potential we
describe in great details the characteristic of the inflationary universe
model. The parameters of the model are restricted by using recent astronomical
observations.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 18:32:26 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"del Campo",
"Sergio",
""
],
[
"Herrera",
"Ramon",
""
]
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] |
801.3252 | M. Rodriguez | M. Rodriguez, S. R. Clark and D. Jaksch | Adiabatic melting of two-component Mott-insulator states | 10 pages, 9 figures | null | 10.1103/PhysRevA.77.043613 | null | cond-mat.mes-hall | null | We analyze the outcome of a Mott insulator to superfluid transition for a
two-component Bose gas with two atoms per site in an optical lattice in the
limit of slow ramping down the lattice potential. This manipulation of the
initial Mott insulating state transforms local correlations between hyperfine
states of atom pairs into multiparticle correlations extending over the whole
system. We show how to create macroscopic twin Fock states in this way an that,
in general, the obtained superfluid states are highly depleted even for initial
ground Mott insulator states.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 19:42:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rodriguez",
"M.",
""
],
[
"Clark",
"S. R.",
""
],
[
"Jaksch",
"D.",
""
]
] | [
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] |
801.3253 | D. N. Yetter | B. Bischof, R. Kogan, D. N. Yetter | On a Basis for the Framed Link Vector Space Spanned by Chord Diagrams | 25 papers, numerous png figures | null | null | null | math.GT math.QA | null | In view of the result of Kontsevich, now often called ``the fundamental
theorem of Vassiliev theory'', identifying the graded dual of the associated
graded vector space to the space of Vassiliev invariants filtered by degree
with the linear span of chord diagrams modulo the ``4T-relation'' (and in the
unframed case, the ``1T-'' or ``isolated chord relation''), it is a problem of
some interest to provide a basis for the space of chord diagrams modulo the
4T-relation.
We construct the basis for the vector space spanned by chord diagrams with n
chords and m distinguishable link components, modulo 4T relations for n less
than or equal to 5.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 19:53:14 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Bischof",
"B.",
""
],
[
"Kogan",
"R.",
""
],
[
"Yetter",
"D. N.",
""
]
] | [
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] |
801.3254 | Wenwu Tian | W.W. Tian, D.A. Leahy, M. Haverkorn, B. Jiang | Discovery of the radio and X-ray counterpart of TeV Gamma-ray source
HESS J1731-347 | 4 pages, 3 figures, accepted by ApJ Letters | null | 10.1086/589506 | null | astro-ph | null | We discover a faint shell-type radio and X-ray source, G353.6-0.7, associated
with HESS J1731-347. G353.6-0.7 is likely an old supernova remnant (SNR), based
on radio (0.8 GHz, 1.4 GHz and 5 GHz), infrared (8 $\mu$m from the GLIMPSE
Legacy Project and 21 $\mu$m from the Midcourse Space Experiment), and X-ray
(0.1 keV - 2.4 keV from the ROSAT survey and 5 - 20 keV from the INTEGRAL
survey) data. The SNR, centered at ({\sl l}, {\sl b})=(353.55, -0.65) with a
radius of $\sim$ 0.25$^{\circ}$, closely matches the outline of the recently
discovered extended TeV source HESS J1731-347, which has no previously
identified counterpart. A diffuse X-ray enhancement detected in the ROSAT
all-sky survey is coincident with lower half shell of the SNR. Therefore the
SNR is the best radio counterpart of both the HESS source and the diffuse X-ray
enhancement. G353.6-0.7 has an age of $\sim$ 27000 yrs. Altogether, the new
discovery provides the best case that an old SNR emits TeV $\gamma$-rays.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 19:03:22 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 19:27:44 GMT"
},
{
"version": "v3",
"created": "Thu, 17 Apr 2008 15:52:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tian",
"W. W.",
""
],
[
"Leahy",
"D. A.",
""
],
[
"Haverkorn",
"M.",
""
],
[
"Jiang",
"B.",
""
]
] | [
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] |
801.3255 | Bjorn Hessmo | Marco Wilzbach, Dennis Heine, S\"onke Groth, Xiyuan Liu, Thomas Raub,
Bj\"orn Hessmo, J\"org Schmiedmayer | A simple integrated single-atom detector | 3 pages, 3 figures | Optics Letters, Vol. 34, page 259 (2009) | 10.1364/OL.34.000259 | null | physics.atom-ph physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a reliable and robust integrated fluorescence detector capable of
detecting single atoms. The detector consists of a tapered lensed single-mode
fiber for precise delivery of excitation light and a multimode fiber to collect
the fluorescence. Both are mounted in lithographically defined SU-8 holding
structures on an atom chip. Rb87 atoms propagating freely in a magnetic guide
are detected with an efficiency of up to 66%, and a signal-to-noise ratio in
excess of 100 is obtained for short integration times.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 20:18:44 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Mar 2009 08:02:01 GMT"
}
] | 2009-03-12T00:00:00 | [
[
"Wilzbach",
"Marco",
""
],
[
"Heine",
"Dennis",
""
],
[
"Groth",
"Sönke",
""
],
[
"Liu",
"Xiyuan",
""
],
[
"Raub",
"Thomas",
""
],
[
"Hessmo",
"Björn",
""
],
[
"Schmiedmayer",
"Jörg",
""
]
] | [
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] |
801.3256 | Roustam Zalaletdinov | Roustam Zalaletdinov | The Averaging Problem in Cosmology and Macroscopic Gravity | 8 pages, LaTeX, ws-ijmpa.cls, few style and typo corrections. Based
on the plenary talk given at the Second Stueckelberg Workshop, ICRANet
Coordinating Center, Pescara, Italy, September 3-7, 2007. To appear in
International Journal of Modern Physics A (2008) | Int.J.Mod.Phys.A23:1173-1181,2008 | 10.1142/S0217751X08040032 | null | gr-qc | null | The averaging problem in cosmology and the approach of macroscopic gravity to
resolve the problem is discussed. The averaged Einstein equations of
macroscopic gravity are modified on cosmological scales by the macroscopic
gravitational correlation tensor terms as compared with the Einstein equations
of general relativity. This correlation tensor satisfies a system of structure
and field equations. An exact cosmological solution to the macroscopic gravity
equations for a constant macroscopic gravitational connection correlation
tensor for a flat spatially homogeneous, isotropic macroscopic space-time is
presented. The correlation tensor term in the macroscopic Einstein equations
has been found to take the form of either a negative or positive spatial
curvature term. Thus, macroscopic gravity provides a cosmological model for a
flat spatially homogeneous, isotropic Universe which obeys the dynamical law
for either an open or closed Universe.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 18:55:47 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 17:04:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zalaletdinov",
"Roustam",
""
]
] | [
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] |
801.3257 | Richard Bass | Richard F. Bass and Edwin A. Perkins | Degenerate stochastic differential equations arising from catalytic
branching networks | null | null | null | null | math.PR | null | We establish existence and uniqueness for the martingale problem associated
with a system of degenerate SDE's representing a catalytic branching network.
For example, in the hypercyclic case:
$$dX_{t}^{(i)}=b_i(X_t)dt+\sqrt{2\gamma_{i}(X_{t})
X_{t}^{(i+1)}X_{t}^{(i)}}dB_{t}^{i}, X_t^{(i)}\ge 0, i=1,..., d,$$ where
$X^{(d+1)}\equiv X^{(1)}$, existence and uniqueness is proved when $\gamma$ and
$b$ are continuous on the positive orthant, $\gamma$ is strictly positive, and
$b_i>0$ on $\{x_i=0\}$. The special case $d=2$, $b_i=\theta_i-x_i$ is required
in work of Dawson-Greven-den Hollander-Sun-Swart on mean fields limits of block
averages for 2-type branching models on a hierarchical group. The proofs make
use of some new methods, including Cotlar's lemma to establish asymptotic
orthogonality of the derivatives of an associated semigroup at different
times,and a refined integration by parts technique from Dawson-Perkins]. As a
by-product of the proof we obtain the strong Feller property of the associated
resolvent.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 18:54:28 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Bass",
"Richard F.",
""
],
[
"Perkins",
"Edwin A.",
""
]
] | [
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] |
801.3258 | Inma Martinez-Valpuesta | Martinez-Valpuesta, I.(1,2) and Athanassoula, E. (2) ((1) Instituto de
Astrofisica de Canarias, Tenerife, Spain, (2) Laboratoire d'Astrophysique de
Marseille, Observatoire Astronomique de Marseille Provence, Marseille,
France) | Boxy/Peanut bulges and stellar bars | 4 pages, 3 figures, to appear in the Proceedings of the conference
`Pathways through an Eclectic Universe', J.H. Knapen, T.J. Mahoney, and A.
Vazdekis eds., ASP Conf. Series, 2007 | null | null | null | astro-ph | null | Boxy/peanut bulges in disc galaxies have been associated to stellar bars. We
analyse their properties in a large sample of $N$-body simulations, using
different methods to measure their strength, shape and possible asymmetry, and
then inter-compare the results. Some of these methods can be applied to both
simulations and observations. In particular, we seek correlations between bar
and peanut properties, which, when applied to real galaxies, will give
information on bars in edge-on galaxies, and on peanuts in face-on galaxies.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 18:58:51 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Martinez-Valpuesta",
"",
""
],
[
"I.",
"",
""
],
[
"Athanassoula",
"",
""
],
[
"E.",
"",
""
]
] | [
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801.3259 | Antti S\"ayn\"atjoki | A. S\"ayn\"atjoki, K. Vynck, M. Mulot, D. Cassagne, J. Ahopelto, H.
Lipsanen | Efficient light coupling into a photonic crystal waveguide with flatband
slow mode | 11 pages, 7 figures, submitted to Photonics and Nanostructures -
Fundamentals and Applications | null | 10.1016/j.photonics.2008.03.001 | null | physics.optics | null | We design an efficient coupler to transmit light from a strip waveguide into
the flatband slow mode of a photonic crystal waveguide with ring-shaped holes.
The coupler is a section of a photonic crystal waveguide with a higher group
velocity, obtained by different ring dimensions. We demonstrate coupling
efficiency in excess of 95% over the 8 nm wavelength range where the photonic
crystal waveguide exhibits a quasi constant group velocity vg = c/37. An
analysis based on the small Fabry-P\'erot resonances in the simulated
transmission spectra is introduced and used for studying the effect of the
coupler length and for evaluating the coupling efficiency in different parts of
the coupler. The mode conversion efficiency within the coupler is more than
99.7% over the wavelength range of interest. The parasitic reflectance in the
coupler, which depends on the propagation constant mismatch between the slow
mode and the coupler mode, is lower than 0.6% within this wavelength range.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 20:37:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Säynätjoki",
"A.",
""
],
[
"Vynck",
"K.",
""
],
[
"Mulot",
"M.",
""
],
[
"Cassagne",
"D.",
""
],
[
"Ahopelto",
"J.",
""
],
[
"Lipsanen",
"H.",
""
]
] | [
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] |
801.326 | Keith Hubbard | Keith Hubbard | Vertex coalgebras, comodules, cocommutativity and coassociativity | 26 pages | null | null | null | math.QA | null | We introduce the notion of vertex coalgebra, a generalization of vertex
operator coalgebras. Next we investigate forms of cocommutativity,
coassociativity, skew-symmetry, and an endomorphism, $D^*$, which hold on
vertex coalgebras. The former two properties require grading. We then discuss
comodule structure. We conclude by discussing instances where graded vertex
coalgebras appear, particularly as related to Primc's vertex Lie algebra and
(universal) enveloping vertex algebras.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 19:18:00 GMT"
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] | 2008-01-22T00:00:00 | [
[
"Hubbard",
"Keith",
""
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801.3261 | Amel Bentata | Amel Bentata (PMA) | A note about conditional Ornstein-Uhlenbeck processes | null | null | null | null | math.PR | null | In this short note, the identity in law, which was obtained by P. Salminen,
between on one hand, the Ornstein-Uhlenbeck process with parameter gamma,
killed when it reaches 0, and on the other hand, the 3-dimensional radial
Ornstein-Uhlenbeck process killed exponentially at rate gamma and conditioned
to hit 0, is derived from a simple absolute continuity relationship.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 19:22:14 GMT"
}
] | 2008-08-20T00:00:00 | [
[
"Bentata",
"Amel",
"",
"PMA"
]
] | [
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801.3262 | Manfried Faber | Manfried Faber | Kinematics and Quantum Field Theory of the Neutrino Oscillations
Observed in the Time-modulated Orbital Electron Capture Decay in an Ion
Storage Ring | 17 pages | null | null | null | nucl-th | null | According to the recent experimental data of a GSI--experiment, the rate of
the number of daughter ions $^{140}{\rm Ce}^{58+}$, produced by a nuclear
K--shell electron capture (EC) of the H--like ion ${^{140}}{\rm Pr}^{58+}$, is
modulated in time with a period $T_d=(7.06\pm 8) $seconds. We explain this
phenomenon by neutrino--flavour mixing and show that this can be understood
within standard quantum field theory and derive a value for the squared mass
difference $\Delta m^2_{21}=m^2_2-m^2_1=(0.763\pm 8) \cdot 10^{-4}
\mathrm{eV}^2$. This proves that such processes provide a precise method to
investigate neutrino--flavour mixing.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 19:26:46 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Faber",
"Manfried",
""
]
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] |
801.3263 | Rosane Freire Riera | A.A.G. Cortines, R. Riera, C. Anteneodo | From short to fat tails in financial markets: A unified description | 11 pages, 5 figures | European Journal of Physics B, volume 60, p. 385, 2007 | null | null | q-fin.ST cond-mat.stat-mech physics.soc-ph | null | In complex systems such as turbulent flows and financial markets, the
dynamics in long and short time-lags, signaled by Gaussian and fat-tailed
statistics, respectively, calls for a unified description. To address this
issue we analyze a real dataset, namely, price fluctuations, in a wide range of
temporal scales to embrace both regimes. By means of Kramers-Moyal (KM)
coefficients evaluated from empirical time series, we obtain the evolution
equation for the probability density function (PDF) of price returns. We also
present consistent asymptotic solutions for the timescale dependent equation
that emerges from the empirical analysis. From these solutions, new
relationships connecting PDF characteristics, such as tail exponents, to
parameters of KM coefficients arise. The results reveal a dynamical path that
leads from Gaussian to fat-tailed statistics, furnishing insights on other
complex systems where akin crossover is observed.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 19:30:12 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Cortines",
"A. A. G.",
""
],
[
"Riera",
"R.",
""
],
[
"Anteneodo",
"C.",
""
]
] | [
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] |
801.3264 | Judith G. Cohen | Judith G. Cohen, Wenjin Huang, A. Udalski, Andrew Gould and Jennifer
Johnson | Clues to the Metallicity Distribution in the Galactic Bulge: Abundances
in OGLE-2007_BLG-349S | version accepted by the ApJ, minor changes from originl submission,
38 pages with 6 figures (2 in color) | null | 10.1086/589143 | null | astro-ph | null | We present an abundance analysis based on high dispersion and high
signal-to-noise ratio Keck spectra of a very highly microlensed Galactic bulge
dwarf, OGLE-2007-BLG-349S, with Teff ~ 5400 K. The amplification at the time
the spectra were taken ranged from 350 to 450. This bulge star is highly
enhanced in metallicity with [Fe/H] = +0.51 \pm 0.09 dex. The abundance ratios
for the 28 species of 26 elements for which features could be detected in the
spectra are solar. In particular, there is no evidence for enhancement of any
of the alpha-elements including O and Mg. We conclude that the high [Fe/H] seen
in this star, when combined with the equally high [Fe/H] derived in previous
detailed abundance analysis of two other Galactic bulge dwarfs, both also
microlensed, implies that the median metallicity in the Galactic bulge is very
high. We thus infer that many previous estimates of the metallicity
distribution in the Galactic bulge have substantially underestimated the mean
Fe-metallicity there due to sample bias, and suggest a candidate mechanism for
such. If our conjecture proves valid, it may be necessary to update the
calibrations for the algorithms used by many groups to interpret spectra and
broad band photometry of the integrated light of very metal-rich old stellar
populations, including luminous elliptical galaxies.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 19:30:46 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Apr 2008 21:35:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cohen",
"Judith G.",
""
],
[
"Huang",
"Wenjin",
""
],
[
"Udalski",
"A.",
""
],
[
"Gould",
"Andrew",
""
],
[
"Johnson",
"Jennifer",
""
]
] | [
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] |
801.3265 | Michael S Pierce | M.S. Pierce, K-C Chang, D.C. Hennessy, V. Komanicky, A. Menzel, H. You | CO-induced lifting of Au (001) surface reconstruction | 4 Figures. Accepted as a Letter to Journal of Physical Chemistry C | J. Phys. Chem. C, 112(7), 2231 (2008) | 10.1021/jp7105764 | null | cond-mat.mtrl-sci | null | We report CO-induced lifting of the hexagonal surface reconstruction on Au
(001). Using in-situ surface x-ray scattering, we determined a
pressure-temperature phase diagram for the reconstruction and measured the
dynamical evolution of the surface structure in real time. Our observations
provide evidence that, under certain conditions, even macroscopic Au surfaces,
much larger than catalytic Au nanoparticles [M. Haruta, Catal. Today 36, 153
(1997)], can exhibit some of the reactive properties and surface transitions
observed in systems known to be catalytically active such as Pt (001).
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 20:52:06 GMT"
}
] | 2009-09-15T00:00:00 | [
[
"Pierce",
"M. S.",
""
],
[
"Chang",
"K-C",
""
],
[
"Hennessy",
"D. C.",
""
],
[
"Komanicky",
"V.",
""
],
[
"Menzel",
"A.",
""
],
[
"You",
"H.",
""
]
] | [
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] |
801.3266 | Akikazu Hashimoto | Akikazu Hashimoto | A Note on Spontaneously Broken Lorentz Invariance | 11 pages, references added, minor changes | JHEP 0808:040,2008 | 10.1088/1126-6708/2008/08/040 | MAD-TH-08-01 | hep-th | null | We consider a relativistic effective field theory of vector boson whose
vacuum exhibits spontaneous breaking of Lorentz invariance. We argue that a
simple model of this type, considered recently by Kraus and Tomboulis, is
obstructed from having a consistent ultraviolet completion according to the
diagnostic recently suggested by Adams, Arkani-Hamed, Dubovsky, Nicolis, and
Rattazzi.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 20:55:16 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jan 2008 16:47:13 GMT"
},
{
"version": "v3",
"created": "Wed, 6 Feb 2008 00:11:57 GMT"
}
] | 2010-02-03T00:00:00 | [
[
"Hashimoto",
"Akikazu",
""
]
] | [
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] |
801.3267 | George Rieke | Yeunjin Kim, G. H. Rieke, O. Krause, K. Misselt, R. Indebetouw, and K.
E. Johnson | Structure of the interstellar medium around Cas A | 29 pages including 10 figures; accepted by The Astrophysical Journal | null | 10.1086/533426 | null | astro-ph | null | We present a three-year series of observations at 24 microns with the Spitzer
Space Telescope of the interstellar material in a 200 x 200 arcmin square area
centered on Cassiopeia A. Interstellar dust heated by the outward light pulse
from the supernova explosion emits in the form of compact, moving features.
Their sequential outward movements allow us to study the complicated
three-dimensional structure of the interstellar medium (ISM) behind and near
Cassiopeia A. The ISM consists of sheets and filaments, with many structures on
a scale of a parsec or less. The spatial power spectrum of the ISM appears to
be similar to that of fractals with a spectral index of 3.5. The filling factor
for the small structures above the spatial wavenumber k ~ 0.5 cycles/pc is only
~ 0.4%.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 20:56:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kim",
"Yeunjin",
""
],
[
"Rieke",
"G. H.",
""
],
[
"Krause",
"O.",
""
],
[
"Misselt",
"K.",
""
],
[
"Indebetouw",
"R.",
""
],
[
"Johnson",
"K. E.",
""
]
] | [
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] |
801.3268 | Teodoro Mu\~noz-Darias | T. Mu\~noz-Darias, J. Casares, I.G. Martinez-Pais | On the masses and evolutionary status of the black hole binary GX 339-4.
A twin system of XTE J1550-564? | 5 pages, 2 tables, 1 figues. Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.12987.x | null | astro-ph | null | We apply the K-correction to the black hole LMXB GX 339-4 which implies Mx >
6 Msun by only assuming that the companion is more massive than ~0.17 Msun, the
lower limit allowed by applying a 'stripped-giant' model. This evolutionary
model successfully reproduces the observed properties of the system. We obtain
a maximum mass for the companion of M2 < 1.1 Msun and an upper limit to the
mass ratio of q(=M2/Mx)< 0.125. The high X-ray activity displayed by the source
suggests a relatively large mass transfer rate which, according to the model,
results in M2 > 0.3 Msun and Mx > 7 Msun. We have also applied this scenario to
the black hole binary XTE J1550-564, which has a similar orbital period but the
donor is detected spectroscopically. The model successfully reproduces the
observed stellar parameters.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 22:03:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Muñoz-Darias",
"T.",
""
],
[
"Casares",
"J.",
""
],
[
"Martinez-Pais",
"I. G.",
""
]
] | [
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] |
801.3269 | Savvas Koushiappas | Marc Kamionkowski (Caltech), Savvas M. Koushiappas (LANL) | Galactic Substructure and Direct Detection of Dark Matter | 11 pages, 3 figures, Replaced with version accepted for publication
in Phys. Rev. D | Phys.Rev.D77:103509,2008 | 10.1103/PhysRevD.77.103509 | LA-UR-07-7442 | astro-ph | null | We study the effects of substructure in the Galactic halo on direct detection
of dark matter, on searches for energetic neutrinos from WIMP annihilation in
the Sun and Earth, and on the enhancement in the WIMP annihilation rate in the
halo. Our central result is a probability distribution function (PDF) P(\rho)
for the local dark-matter density. This distribution must be taken into account
when using null dark-matter searches to constrain the properties of dark-matter
candidates. We take two approaches to calculating the PDF. The first is an
analytic model that capitalizes on the scale-invariant nature of the
structure--formation hierarchy in order to address early stages in the
hierarchy (very small scales; high densities). Our second approach uses
simulation-inspired results to describe the PDF that arises from lower-density
larger-scale substructures which formed in more recent stages in the merger
hierarchy. The distributions are skew positive, and they peak at densities
lower than the mean density. The local dark-matter density may be as small as
1/10th the canonical value of ~ 0.4 GeV/cm^3, but it is probably no less than
0.2 GeV/cm^3.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 18:28:25 GMT"
},
{
"version": "v2",
"created": "Thu, 22 May 2008 17:49:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kamionkowski",
"Marc",
"",
"Caltech"
],
[
"Koushiappas",
"Savvas M.",
"",
"LANL"
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801.327 | Thomas Kitching | T. D. Kitching, A. N. Taylor, A. F. Heavens | Systematic effects on dark energy from 3D weak shear | 20 pages, 11 figures, submitted to MNRAS | Mon.Not.Roy.Astron.Soc.389:173-190:2008 | 10.1111/j.1365-2966.2008.13419.x | null | astro-ph | null | We present an investigation into the potential effect of systematics inherent
in multi-band wide field surveys on the dark energy equation of state
determination for two 3D weak lensing methods. The weak lensing methods are a
geometric shear-ratio method and 3D cosmic shear. The analysis here uses an
extension of the Fisher matrix framework to jointly include photometric
redshift systematics, shear distortion systematics and intrinsic alignments. We
present results for DUNE and Pan-STARRS surveys. We show that assuming
systematic parameters are fixed, but possibly biased, results in potentially
large biases in dark energy parameters. We quantify any potential bias by
defining a Bias Figure of Merit. We also show the effect on the dark energy
Figure of Merit of marginalising over each systematic parameter individually.
We find that the largest effect on the Figure of Merit comes from uncertainty
in the photometric redshift systematic parameters. These can reduce the Figure
of Merit by up to a factor of 2 to 4 in both 3D weak lensing methods, if no
informative prior on the systematic parameters is applied. Shear distortion
systematics have a smaller overall effect. Intrinsic alignment effects can
reduce the Figure of Merit by up to a further factor of 2. This, however, is a
worst case scenario. By including prior information on systematic parameters
the Figure of Merit can be recovered to a large extent. We conclude that, as a
rule of thumb, given a realistic current understanding of intrinsic alignments
and photometric redshifts, then including all three primary systematic effects
reduces the Figure of Merit by at most a factor of 2, but that in reality this
factor should be much less. [abridged]
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 21:17:48 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Kitching",
"T. D.",
""
],
[
"Taylor",
"A. N.",
""
],
[
"Heavens",
"A. F.",
""
]
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] |
801.3271 | Roya Mohayaee | Roya Mohayaee, Pierre Salati | The Cosmic Ray Signature of Dark Matter Caustics | 16 pages, 11 figures, version to appear in MNRAS | null | 10.1111/j.1365-2966.2008.13707.x | LAPTH-1235/08 | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational collapse of dark matter, merger of dark matter haloes and tidal
disruption of satellites are among processes which lead to the formation of
fine and dense dark matter shells, also known as dark matter caustics. The
putative weakly interacting species which may form the dark matter are expected
to strongly annihilate in these dense regions of the Milky Way halo and
generate in particular antiprotons and positrons. We derive the flux of these
rare antimatter particles at the Earth and show that it depends significantly
on the cut-off radius of the dark matter distribution at the galactic centre.
Boost factors of ~30 are found with respect to a smooth NFW profile for
high-energy antiprotons and low-energy positrons if this cut-off radius is
taken to be 300 pc -- a somewhat extreme value though. This yields a detectable
antiproton signal around hundreds of Gev in models where the annihilation cross
section today is enhanced by non--perturbative effects as in the generic case
of a heavy Wino. However, dark matter caustics cannot provide a better
explanation for the HEAT excess reported above ~10 GeV than a smooth NFW or
isothermal cored distribution.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 21:01:03 GMT"
},
{
"version": "v2",
"created": "Thu, 1 May 2008 09:00:36 GMT"
},
{
"version": "v3",
"created": "Mon, 23 Jun 2008 20:00:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mohayaee",
"Roya",
""
],
[
"Salati",
"Pierre",
""
]
] | [
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] |
801.3272 | Steven Peters | Steven W. Peters and Robert W. Heath Jr | Nonregenerative MIMO Relaying with Optimal Transmit Antenna Selection | null | null | 10.1109/LSP.2008.921466 | null | cs.IT math.IT | null | We derive optimal SNR-based transmit antenna selection rules at the source
and relay for the nonregenerative half duplex MIMO relay channel. While antenna
selection is a suboptimal form of beamforming, it has the advantage that the
optimization is tractable and can be implemented with only a few bits of
feedback from the destination to the source and relay. We compare the bit error
rate of optimal antenna selection at both the source and relay to other
proposed beamforming techniques and propose methods for performing the
necessary limited feedback.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 21:03:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Peters",
"Steven W.",
""
],
[
"Heath",
"Robert W.",
"Jr"
]
] | [
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