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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.0198 | Alexander E. Hramov | A.A. Koronovskii, M.K. Kurovskaya, O.I. Moskalenko, and A.E. Hramov | Two Scenarios of Breaking Chaotic Phase Synchronization | 8 pages, 7 figures | Technical Physics. 2006. Vol. 52, No. 1. PP. 19-26 | 10.1134/S1063784207010045 | null | nlin.CD | null | Two types of phase synchronization (accordingly, two scenarios of breaking
phase synchronization) between coupled stochastic oscillators are shown to
exist depending on the discrepancy between the control parameters of
interacting oscillators, as in the case of classical synchronization of
periodic oscillators. If interacting stochastic oscillators are weakly detuned,
the phase coherency of the attractors persists when phase synchronization
breaks. Conversely, if the control parameters differ considerably, the chaotic
attractor becomes phase-incoherent under the conditions of phase
synchronization break.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:37:05 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Koronovskii",
"A. A.",
""
],
[
"Kurovskaya",
"M. K.",
""
],
[
"Moskalenko",
"O. I.",
""
],
[
"Hramov",
"A. E.",
""
]
] |
0705.0199 | Erik Berglund | Erik Berglund, Joaquin Sitte | The Parameter-Less Self-Organizing Map algorithm | 29 pages, 27 figures. Based on publication in IEEE Trans. on Neural
Networks | IEEE Transactions on Neural Networks, 2006 v.17, n.2, pp.305-316 | null | null | cs.NE cs.AI cs.CV | null | The Parameter-Less Self-Organizing Map (PLSOM) is a new neural network
algorithm based on the Self-Organizing Map (SOM). It eliminates the need for a
learning rate and annealing schemes for learning rate and neighbourhood size.
We discuss the relative performance of the PLSOM and the SOM and demonstrate
some tasks in which the SOM fails but the PLSOM performs satisfactory. Finally
we discuss some example applications of the PLSOM and present a proof of
ordering under certain limited conditions.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 04:04:51 GMT"
},
{
"version": "v2",
"created": "Tue, 8 May 2007 01:06:10 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Berglund",
"Erik",
""
],
[
"Sitte",
"Joaquin",
""
]
] |
0705.0200 | Steve Shkoller | C.H. Arthur Cheng, Daniel Coutand, and Steve Shkoller | On the Motion of Vortex Sheets with Surface Tension in the 3D Euler
Equations with Vorticity | 28 pages | null | null | null | math.AP | null | We prove well-posedness of vortex sheets with surface tension in the 3D
incompressible Euler equations with vorticity.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 04:34:03 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cheng",
"C. H. Arthur",
""
],
[
"Coutand",
"Daniel",
""
],
[
"Shkoller",
"Steve",
""
]
] |
0705.0201 | Jesse Bloom | Jesse D Bloom, Philip A Romero, Zhongyi Lu, and Frances H Arnold | Neutral genetic drift can aid functional protein evolution | null | Biology Direct 2:17 (2007) | 10.1186/1745-6150-2-17 | null | q-bio.PE q-bio.BM | null | BACKGROUND: Many of the mutations accumulated by naturally evolving proteins
are neutral in the sense that they do not significantly alter a protein's
ability to perform its primary biological function. However, new protein
functions evolve when selection begins to favor other, "promiscuous" functions
that are incidental to a protein's biological role. If mutations that are
neutral with respect to a protein's primary biological function cause
substantial changes in promiscuous functions, these mutations could enable
future functional evolution.
RESULTS: Here we investigate this possibility experimentally by examining how
cytochrome P450 enzymes that have evolved neutrally with respect to activity on
a single substrate have changed in their abilities to catalyze reactions on
five other substrates. We find that the enzymes have sometimes changed as much
as four-fold in the promiscuous activities. The changes in promiscuous
activities tend to increase with the number of mutations, and can be largely
rationalized in terms of the chemical structures of the substrates. The
activities on chemically similar substrates tend to change in a coordinated
fashion, potentially providing a route for systematically predicting the change
in one function based on the measurement of several others.
CONCLUSIONS: Our work suggests that initially neutral genetic drift can lead
to substantial changes in protein functions that are not currently under
selection, in effect poising the proteins to more readily undergo functional
evolution should selection "ask new questions" in the future.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 05:02:10 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Bloom",
"Jesse D",
""
],
[
"Romero",
"Philip A",
""
],
[
"Lu",
"Zhongyi",
""
],
[
"Arnold",
"Frances H",
""
]
] |
0705.0202 | Andreas Haungs | Andreas Haungs | Air Shower Measurements in Karlsruhe | (15 pages) Contribution to the 80th anniversary of late Georgii
Borisovich Khristiansen. To appear at "Akademik G.B. Khristiansen - uchenyi
Moskovskogo universiteta (k 80-letiyu so dnya rozhdeniya). M.: Izdatel'stvo
KDU, 2007" | null | null | null | astro-ph | null | The Karlsruhe multi-detector set-ups KASCADE, KASCADE-Grande, and LOPES aim
on measurements of cosmic rays in the energy range of the so called knee
between 10^14 eV and 10^18 eV. The multidimensional analysis of the air shower
data measured by KASCADE indicates a distinct knee in the energy spectra of
light primary cosmic rays and an increasing dominance of heavy ones towards
higher energies. This provides, together with the results of large scale
anisotropy studies, implications for discriminating astrophysical models of the
origin of the knee. To improve the reconstruction quality and statistics at
higher energies, where the knee of the heavy primaries is expected at around
100 PeV, KASCADE has been extended by a factor 10 in area to the new experiment
KASCADE-Grande. LOPES is located on site of the KASCADE-Grande experiment. It
measures radio pulses from extensive air showers with the goal to establish
this renewed detection technique for future large scale experiments.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 05:34:10 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Haungs",
"Andreas",
""
]
] |
0705.0203 | Stephen Williams | Stephen R. Williams | Topological Classification of Clusters in Condensed Phases | 9 pages, 6 figures | null | null | null | cond-mat.soft | null | A methodology is developed to identify clusters in a bulk phase which are
topologically equivalent to certain reference clusters. The selected reference
clusters are the Morse clusters with 13 or less atoms and the 13 atom clusters
found in an FCC and an HCP crystal phase, consisting of an atom and its 12
nearest neighbours. The first step in using the method requires the bond
network of the bulk phase to be identified. The bonds may be identified in
terms of the distance between the atom pairs or by using a modified Voronoi
decomposition, introduced here. We then search for all the 3, 4 and 5 membered
shortest path rings and use these to identify some basic clusters. These basic
clusters are then combined to identify the above mentioned Morse and crystal
clusters. The larger Morse clusters (N>13) may be identified in terms of the
basic clusters and the smaller Morse clusters. This work has important
applications in studying the energy landscape of a bulk phase. As an example,
results from a limited preliminary study on the hard sphere fluid phase are
presented.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 05:51:26 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Williams",
"Stephen R.",
""
]
] |
0705.0204 | Tshilidzi Marwala | Lukasz A. Machowski, and Tshilidzi Marwala | Using Images to create a Hierarchical Grid Spatial Index | In Proceedings of the IEEE International Conference on Systems, Man
and Cybernetics, Taiwan, 2006, pp. 1974-1979 | null | 10.1109/ICSMC.2006.385020 | null | cs.DS | null | This paper presents a hybrid approach to spatial indexing of two dimensional
data. It sheds new light on the age old problem by thinking of the traditional
algorithms as working with images. Inspiration is drawn from an analogous
situation that is found in machine and human vision. Image processing
techniques are used to assist in the spatial indexing of the data. A fixed grid
approach is used and bins with too many records are sub-divided hierarchically.
Search queries are pre-computed for bins that do not contain any data records.
This has the effect of dividing the search space up into non rectangular
regions which are based on the spatial properties of the data. The bucketing
quad tree can be considered as an image with a resolution of two by two for
each layer. The results show that this method performs better than the quad
tree if there are more divisions per layer. This confirms our suspicions that
the algorithm works better if it gets to look at the data with higher
resolution images. An elegant class structure is developed where the
implementation of concrete spatial indexes for a particular data type merely
relies on rendering the data onto an image.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 05:37:32 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Machowski",
"Lukasz A.",
""
],
[
"Marwala",
"Tshilidzi",
""
]
] |
0705.0205 | Vic Viola | V.E. Viola | Note on Breakup Densities in Fragmentation | null | null | null | null | nucl-ex | null | This note elaborates the procedures involved in the derivation of breakup
densities in nuclear fragmentation. It is stressed that the formalism employed
in the analysis served only as a spectral fitting function and does not imply
any specific reaction mechanism.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:54:22 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Viola",
"V. E.",
""
]
] |
0705.0206 | Eyal Buks | Eyal Buks, Stav Zaitsev, Eran Segev, Baleegh Abdo, and M. P. Blencowe | Displacement Detection with a Vibrating RF SQUID: Beating the Standard
Linear Limit | null | null | 10.1103/PhysRevE.76.026217 | null | cond-mat.mes-hall cond-mat.supr-con | null | We study a novel configuration for displacement detection consisting of a
nanomechanical resonator coupled to both, a radio frequency superconducting
interference device (RF SQUID) and to a superconducting stripline resonator. We
employ an adiabatic approximation and rotating wave approximation and calculate
the displacement sensitivity. We study the performance of such a displacement
detector when the stripline resonator is driven into a region of nonlinear
oscillations. In this region the system exhibits noise squeezing in the output
signal when homodyne detection is employed for readout. We show that
displacement sensitivity of the device in this region may exceed the upper
bound imposed upon the sensitivity when operating in the linear region. On the
other hand, we find that the high displacement sensitivity is accompanied by a
slowing down of the response of the system, resulting in a limited bandwidth.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 06:23:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Buks",
"Eyal",
""
],
[
"Zaitsev",
"Stav",
""
],
[
"Segev",
"Eran",
""
],
[
"Abdo",
"Baleegh",
""
],
[
"Blencowe",
"M. P.",
""
]
] |
0705.0207 | Andrew Linshaw | Bong H. Lian, Andrew R. Linshaw, Bailin Song | Chiral Equivariant Cohomology III | Final version | American J. Math. vol. 132, no. 6 (2010), 1549-1590 | 10.1353/ajm.2010.0021 | null | math.DG math.QA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the third of a series of papers on a new equivariant cohomology that
takes values in a vertex algebra, and contains and generalizes the classical
equivariant cohomology of a manifold with a Lie group action a la H. Cartan. In
this paper, we compute this cohomology for spheres and show that for any simple
connected group G, there is a sphere with infinitely many actions of G which
have distinct chiral equivariant cohomology, but identical classical
equivariant cohomology. Unlike the classical case, the description of the
chiral equivariant cohomology of spheres requires a substantial amount of new
structural theory, which we fully develop in this paper. This includes a
quasi-conformal structure, equivariant homotopy invariance, and the values of
this cohomology on homogeneous spaces. These results rely on crucial features
of the underlying vertex algebra valued complex that have no classical
analogues.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 07:07:06 GMT"
},
{
"version": "v2",
"created": "Sat, 1 Sep 2007 20:38:51 GMT"
},
{
"version": "v3",
"created": "Fri, 9 Jul 2010 09:24:06 GMT"
},
{
"version": "v4",
"created": "Thu, 26 Aug 2010 10:33:29 GMT"
}
] | 2021-05-21T00:00:00 | [
[
"Lian",
"Bong H.",
""
],
[
"Linshaw",
"Andrew R.",
""
],
[
"Song",
"Bailin",
""
]
] |
0705.0208 | Hikaru Kawamura | Takeshi Kotani, Hajime Yoshino and Hikaru Kawamura | Periodicity and criticality in the Olami-Feder-Christensen model of
earthquakes | null | Phys. Rev. E77 010102(R) (2008) | 10.1103/PhysRevE.77.010102 | null | cond-mat.other physics.geo-ph | null | Characteristic versus critical features of earthquakes are studied on the
basis of the Olami-Feder-Christensen model. It is found that the local
recurrence-time distribution exhibits a sharp $\delta$-function-like peak
corresponding to rhythmic recurrence of events with a fixed ``period'' uniquely
determined by the transmission parameter of the model, together with a
power-law-like tail corresponding to scale-free recurrence of events. The model
exhibits phenomena closely resembling the asperity known in seismology.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 06:46:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kotani",
"Takeshi",
""
],
[
"Yoshino",
"Hajime",
""
],
[
"Kawamura",
"Hikaru",
""
]
] |
0705.0209 | Nathalie Villa | Fabrice Rossi (INRIA Rocquencourt / INRIA Sophia Antipolis), Nathalie
Villa (GRIMM) | Support vector machine for functional data classification | 13 pages | Neurocomputing / EEG Neurocomputing 69, 7-9 (2006) 730-742 | 10.1016/j.neucom.2005.12.010 | null | math.ST stat.ML stat.TH | null | In many applications, input data are sampled functions taking their values in
infinite dimensional spaces rather than standard vectors. This fact has complex
consequences on data analysis algorithms that motivate modifications of them.
In fact most of the traditional data analysis tools for regression,
classification and clustering have been adapted to functional inputs under the
general name of functional Data Analysis (FDA). In this paper, we investigate
the use of Support Vector Machines (SVMs) for functional data analysis and we
focus on the problem of curves discrimination. SVMs are large margin classifier
tools based on implicit non linear mappings of the considered data into high
dimensional spaces thanks to kernels. We show how to define simple kernels that
take into account the unctional nature of the data and lead to consistent
classification. Experiments conducted on real world data emphasize the benefit
of taking into account some functional aspects of the problems.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 06:48:41 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Rossi",
"Fabrice",
"",
"INRIA Rocquencourt / INRIA Sophia Antipolis"
],
[
"Villa",
"Nathalie",
"",
"GRIMM"
]
] |
0705.0210 | Nathalie Villa | Nathalie Villa (GRIMM), Fabrice Rossi (INRIA Rocquencourt / INRIA
Sophia Antipolis) | Un r\'esultat de consistance pour des SVM fonctionnels par interpolation
spline | 6 pages | Comptes Rendus de l Acad\'emie des Sciences - Series I -
Mathematics 343, 8 (15/10/2006) 555-560 | 10.1016/j.crma.2006.09.025 | null | math.ST stat.TH | null | This Note proposes a new methodology for function classification with Support
Vector Machine (SVM). Rather than relying on projection on a truncated Hilbert
basis as in our previous work, we use an implicit spline interpolation that
allows us to compute SVM on the derivatives of the studied functions. To that
end, we propose a kernel defined directly on the discretizations of the
observed functions. We show that this method is universally consistent.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 06:52:13 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Villa",
"Nathalie",
"",
"GRIMM"
],
[
"Rossi",
"Fabrice",
"",
"INRIA Rocquencourt / INRIA\n Sophia Antipolis"
]
] |
0705.0211 | Nathalie Villa | Louis Ferr\'e (GRIMM), Nathalie Villa (GRIMM) | Multilayer Perceptron with Functional Inputs: an Inverse Regression
Approach | 17 pages | Scandinavian Journal of Statistics 33, 4 (12/2006) 807-823 | 10.1111/j.1467-9469.2006.00496.x | null | math.ST stat.TH | null | Functional data analysis is a growing research field as more and more
practical applications involve functional data. In this paper, we focus on the
problem of regression and classification with functional predictors: the model
suggested combines an efficient dimension reduction procedure [functional
sliced inverse regression, first introduced by Ferr\'e & Yao (Statistics, 37,
2003, 475)], for which we give a regularized version, with the accuracy of a
neural network. Some consistency results are given and the method is
successfully confronted to real-life data.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 06:56:00 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ferré",
"Louis",
"",
"GRIMM"
],
[
"Villa",
"Nathalie",
"",
"GRIMM"
]
] |
0705.0212 | Sandor Varro | Sandor Varro and Gyozo Farkas | Attosecond electron pulses from interference of above-threshold de
Broglie waves | 40 pages, 6 figures | Laser and Particle Beams (2008) Vol. 26, No.1, pages 9-19 | 10.1017/S0263034608000037 | null | physics.plasm-ph physics.gen-ph | null | It is shown that the the interference of above-threshold electron de Broglie
waves, generated by an intense laser pulse at a metal surface yields attosecond
electron pulses. This inerference is an analogon of the superposition of high
harmonics generated from rare gas atoms, resulting in trains of attosecond
light pulses.Owing to the inherent kinematic dispersion, the propagation of
attosecond de Broglie waves in vacuum is very different from that of attosecond
light pulses, which propagate without changing shape. Above the metal surface
there are "collaps bands" and "revival layers" of the electron current even at
macroscopic distances. In the range of parameters considered, the maximum value
of the current densities of such ultrashort electron pulses has been estimated
to be of order of couple of tenths of milliamps per square centimeters.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 07:17:51 GMT"
}
] | 2008-04-04T00:00:00 | [
[
"Varro",
"Sandor",
""
],
[
"Farkas",
"Gyozo",
""
]
] |
0705.0213 | Michael Engel | Michael Engel, Hans-Rainer Trebin (Institut f\"ur Theoretische und
Angewandte Physik, Universit\"at Stuttgart) | Self-Assembly of Monatomic Complex Crystals and Quasicrystals with a
Double-Well Interaction Potential | 4 pages, 6 figures. Physical Review Letters, in Press (April 2007) | Physical Review Letters 98, 225505 (2007) | 10.1103/PhysRevLett.98.225505 | null | cond-mat.other | null | For the study of crystal formation and dynamics we introduce a simple
two-dimensional monatomic model system with a parametrized interaction
potential. We find in molecular dynamics simulations that a surprising variety
of crystals, a decagonal and a dodecagonal quasicrystal are self-assembled. In
the case of the quasicrystals the particles reorder by phason flips at elevated
temperatures. During annealing the entropically stabilized decagonal
quasicrystal undergoes a reversible phase transition at 65% of the melting
temperature into an approximant, which is monitored by the rotation of the de
Bruijn surface in hyperspace.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 07:37:06 GMT"
}
] | 2007-07-03T00:00:00 | [
[
"Engel",
"Michael",
"",
"Institut für Theoretische und\n Angewandte Physik, Universität Stuttgart"
],
[
"Trebin",
"Hans-Rainer",
"",
"Institut für Theoretische und\n Angewandte Physik, Universität Stuttgart"
]
] |
0705.0214 | Mourad Zerai | Mourad Zerai, Maher Moakher | Riemannian level-set methods for tensor-valued data | 11 pages, 03 figures, to be published in the proceedings of SSVM
2007, LNCS Springer | null | null | null | cs.CV | null | We present a novel approach for the derivation of PDE modeling
curvature-driven flows for matrix-valued data. This approach is based on the
Riemannian geometry of the manifold of Symmetric Positive Definite Matrices
Pos(n).
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 07:32:58 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Zerai",
"Mourad",
""
],
[
"Moakher",
"Maher",
""
]
] |
0705.0215 | Ignas Snellen | Ignas Snellen (Leiden Observatory) | Transit and secondary eclipse photometry in the near-infrared | 6 pages, to appear in the PASP proceedings of "Transiting Extrasolar
Planets Workshop" MPIA Heidelberg Germany, 25th-28th September 2006. Eds: C.
Afonso, D. Weldrake & T. Henning | null | null | null | astro-ph | null | Near-infrared photometry of transiting extrasolar planets can be of great
scientific value. It is however not straightforward to reach the necessary
millimagnitude precision. Here we report on our attempts to observe transits
and secondary eclipses of several extrasolar planets at 2.2 micron. Best
results have been obtained on OGLE-TR-113b using the SOFI near-infrared camera
on ESO's New Technology Telescope. Its K-band transit shows a remarkably flat
bottom indicating low stellar limb darkening. Secondary eclipse photometry has
resulted in a formal 3 sigma detection, but residual systematic effects make
this detection rather uncertain.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 07:53:14 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Snellen",
"Ignas",
"",
"Leiden Observatory"
]
] |
0705.0216 | Prof. Dr. M. W. Wu | J. Zhou and M. W. Wu | Spin relaxation due to the Bir-Aronov-Pikus mechanism in intrinsic and
$p$-type GaAs quantum wells from a fully microscopic approach | 10 pages, 6 figures, Phys. Rev. B 77, 2008, in press | Phys. Rev. B 77, 075318 (2008) | 10.1103/PhysRevB.77.075318 | null | cond-mat.mtrl-sci cond-mat.other | null | We study the electron spin relaxation in intrinsic and $p$-type (001) GaAs
quantum wells by constructing and numerically solving the kinetic spin Bloch
equations. All the relevant scatterings are explicitly included, especially the
spin-flip electron-heavy hole exchange scattering which leads to the
Bir-Aronov-Pikus spin relaxation. We show that, due to the neglection of the
nonlinear terms in the electron-heavy hole exchange scattering in the
Fermi-golden-rule approach, the spin relaxation due to the Bir-Aronov-Pikus
mechanism is greatly exaggerated at moderately high electron density and low
temperature in the literature. We compare the spin relaxation time due to the
Bir-Aronov-Pikus mechanism with that due to the D'yakonov-Perel' mechanism
which is also calculated from the kinetic spin Bloch equations with all the
scatterings, especially the spin-conserving electron-electron and
electron-heavy hole scatterings, included. We find that, in intrinsic quantum
wells, the effect from the Bir-Aronov-Pikus mechanism is much smaller than that
from the D'yakonov-Perel' mechanism at low temperature, and it is smaller by no
more than one order of magnitude at high temperature. In $p$-type quantum
wells, the spin relaxation due to the Bir-Aronov-Pikus mechanism is also much
smaller than the one due to the D'yakonov-Perel' mechanism at low temperature
and becomes comparable to each other at higher temperature when the hole
density and the width of the quantum well are large enough. We claim that
unlike in the bulk samples, the Bir-Aronov-Pikus mechanism hardly dominates the
spin relaxation in two-dimensional samples.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:57:14 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 02:46:03 GMT"
},
{
"version": "v3",
"created": "Fri, 28 Dec 2007 17:00:50 GMT"
}
] | 2008-02-21T00:00:00 | [
[
"Zhou",
"J.",
""
],
[
"Wu",
"M. W.",
""
]
] |
0705.0217 | Roland Lehoucq | S. Caillerie, M. Lachi\`eze-Rey, J.-P. Luminet, R. Lehoucq, A.
Riazuelo and J. Weeks | A new analysis of Poincar\'e dodecahedral space model | Accepted by A&A, 6 pages, 4 figures ; revised version according to
referee's comments | null | 10.1051/0004-6361:20077656 | null | astro-ph | null | The full three-year WMAP results (WMAP3) reinforce the absence of large-angle
correlations at scales greater than 60 degrees. The Poincare dodecahedral space
(PDS) model model, which may naturally explain such features, thus remains a
plausible cosmological model, despite recent controversy about whether matched
circle searches would or would not push the topology beyond the horizon. Here,
we have used new eigenmode calculations of the dodecahedral space to predict
the cosmic microwave background (CMB) temperature fluctuations in such models,
with an improved angular resolution. We have simulated CMB maps and confirmed
the expected presence of matching circles. For a set of plausible cosmological
parameters, we have derived the angular power spectrum of the CMB up to large
wavenumbers. Comparison with the WMAP3 observations confirms a remarkable fit
with a PDS model, for a value $\Omega_0 = 1.018$ of the average total energy
density.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 08:09:59 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Oct 2007 12:08:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Caillerie",
"S.",
""
],
[
"Lachièze-Rey",
"M.",
""
],
[
"Luminet",
"J. -P.",
""
],
[
"Lehoucq",
"R.",
""
],
[
"Riazuelo",
"A.",
""
],
[
"Weeks",
"J.",
""
]
] |
0705.0218 | Daniel Freeman | Daniel Freeman | Weakly null sequences with upper estimates | 21 pages | null | null | null | math.FA | null | We prove that if $(v_i)$ is a normalized basic sequence and X is a Banach
space such that every normalized weakly null sequence in X has a subsequence
that is dominated by $(v_i)$, then there exists a uniform constant $C\geq1$
such that every normalized weakly null sequence in X has a subsequence that is
C-dominated by $(v_i)$. This extends a result of Knaust and Odell, who proved
this for the cases in which $(v_i)$ is the standard basis for $\ell_p$ or
$c_0$.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 08:13:36 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Freeman",
"Daniel",
""
]
] |
0705.0219 | Koichi Hamaguchi | K. Hamaguchi, S. Shirai and T. T. Yanagida | Determining the Mass for a Light Gravitino | 9 pages, 12 figures | Phys.Lett.B651:44-48,2007 | 10.1016/j.physletb.2007.05.063 | UT-07-15 | hep-ph | null | Gauge mediated supersymmetry breaking scenarios with an ultra-light gravitino
of mass m_{3/2}=1-10 eV are very interesting, since there is no cosmological
gravitino problem. We propose a new experimental determination of the gravitino
mass for such an ultra-light gravitino, by measuring a branching ratio of two
decay modes of sleptons.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 08:13:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hamaguchi",
"K.",
""
],
[
"Shirai",
"S.",
""
],
[
"Yanagida",
"T. T.",
""
]
] |
0705.0220 | Viktor Dotsenko | V.S.Dotsenko, L.B.Ioffe, V.B.Geshkenbein, S.E.Korshunov and G.Blatter | Joint free energy distribution in the random directed polymer problem | 4 pages, 1 figure | Phys.Rev.Lett. 100 (2008) 050601 | 10.1103/PhysRevLett.100.050601 | null | cond-mat.dis-nn cond-mat.stat-mech | null | We consider two configurations of a random directed polymer of length L
confined to a plane and ending in two points separated by 2u. Defining the mean
free energy $\bar F$ and the free energy difference F' of the two
configurations, we determine the joint distribution function P_{L,u}(\bar F,F')
using the replica approach. We find that for large L and large negative free
energies $\bar F$, the joint distribution function factorizes into longitudinal
(P_{L,u} (\bar F)) and transverse (P_{u}(F')) components, which furthermore
coincide with results obtained prevously via different independent routes.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 08:16:23 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jan 2008 08:49:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dotsenko",
"V. S.",
""
],
[
"Ioffe",
"L. B.",
""
],
[
"Geshkenbein",
"V. B.",
""
],
[
"Korshunov",
"S. E.",
""
],
[
"Blatter",
"G.",
""
]
] |
0705.0221 | Farook Rahaman | F. Rahaman and R. Mondal | Non static Global monopole in Lyra geometry | 7 pages | FizikaB16:223-230,2007 | null | null | gr-qc | null | A class of non static solutions around a global monopole resulting from the
breaking of a global S0(3) symmetry based on Lyra geometry are obtained. The
solutions are obtained using the functional separability of the metric
coefficients. We have shown that the monopole exerts attractive gravitational
effects on test particles.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 08:19:02 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Rahaman",
"F.",
""
],
[
"Mondal",
"R.",
""
]
] |
0705.0222 | Ludmila Petrova | L.I.Petrova | The connection between field-theory and the equations for material
sistems | 9 pages | null | null | null | physics.gen-ph | null | The existing field theories are based on the properties of closed exterior
forms, which correspond to conservation laws for physical fields.
In the present paper it is shown that closed exterior forms corresponding to
field theories are obtained from the equations modelling conservation (balance)
laws for material sistems (material media).
The process of obtaining closed exterior forms demonstrates the connection
between field-theory equations and the equations for material sistems and
points to the fact that the foundations of field theories must be conditioned
by the properties of equations conservation laws for material sistems.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 08:26:14 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Petrova",
"L. I.",
""
]
] |
0705.0223 | Garel | Cecile Monthus and Thomas Garel | On the multifractal statistics of the local order parameter at random
critical points : application to wetting transitions with disorder | 17 pages, 20 figures | Phys. Rev. E 76, 021114 (2007) | 10.1103/PhysRevE.76.021114 | null | cond-mat.dis-nn | null | Disordered systems present multifractal properties at criticality. In
particular, as discovered by Ludwig (A.W.W. Ludwig, Nucl. Phys. B 330, 639
(1990)) on the case of diluted two-dimensional Potts model, the moments
$\bar{\rho^q(r)}$ of the local order parameter $\rho(r)$ scale with a set
$x(q)$ of non-trivial exponents $x(q) \neq q x(1)$. In this paper, we revisit
these ideas to incorporate more recent findings: (i) whenever a multifractal
measure $w(r)$ normalized over space $ \sum_r w(r)=1$ occurs in a random
system, it is crucial to distinguish between the typical values and the
disorder averaged values of the generalized moments $Y_q =\sum_r w^q(r)$, since
they may scale with different generalized dimensions $D(q)$ and $\tilde D(q)$
(ii) as discovered by Wiseman and Domany (S. Wiseman and E. Domany, Phys Rev E
{\bf 52}, 3469 (1995)), the presence of an infinite correlation length induces
a lack of self-averaging at critical points for thermodynamic observables, in
particular for the order parameter. After this general discussion valid for any
random critical point, we apply these ideas to random polymer models that can
be studied numerically for large sizes and good statistics over the samples. We
study the bidimensional wetting or the Poland-Scheraga DNA model with loop
exponent $c=1.5$ (marginal disorder) and $c=1.75$ (relevant disorder). Finally,
we argue that the presence of finite Griffiths ordered clusters at criticality
determines the asymptotic value $x(q \to \infty) =d$ and the minimal value $
\alpha_{min}=D(q \to \infty)=d-x(1) $ of the typical multifractal spectrum
$f(\alpha)$.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 08:28:11 GMT"
}
] | 2007-08-22T00:00:00 | [
[
"Monthus",
"Cecile",
""
],
[
"Garel",
"Thomas",
""
]
] |
0705.0224 | Roland Wester | J. Mikosch, U. Fr\"uhling, S. Trippel, D. Schwalm, M. Weidem\"uller,
R. Wester | Evaporation of buffer gas-thermalized anions out of a multipole rf ion
trap | Phys. Rev. Lett., in press | null | 10.1103/PhysRevLett.98.223001 | null | physics.atom-ph | null | We identify plain evaporation of ions as the fundamental loss mechanism out
of a multipole ion trap. Using thermalized negative Cl- ions we find that the
evaporative loss rate is proportional to a Boltzmann factor. This thermodynamic
description sheds new light on the dynamics of particles in time-varying
confining potentials. It specifically allows us to extract the effective depth
of the ion trap as the activation energy for evaporation. As a function of the
rf amplitude we find two distinct regimes related to the stability of motion of
the trapped ions. For low amplitudes the entire trap allows for stable motion
and the trap depth increases with the rf field. For larger rf amplitudes,
however, rapid energy transfer from the field to the ion motion can occur at
large trap radii, which leads to a reduction of the effective trapping volume.
In this regime the trap depth decreases again with increasing rf amplitude. We
give an analytical parameterization of the trap depth for various multipole
traps that allows predictions of the most favorable trapping conditions.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 08:29:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mikosch",
"J.",
""
],
[
"Frühling",
"U.",
""
],
[
"Trippel",
"S.",
""
],
[
"Schwalm",
"D.",
""
],
[
"Weidemüller",
"M.",
""
],
[
"Wester",
"R.",
""
]
] |
0705.0225 | Sylvain Crovisier | Christian Bonatti, Sylvain Crovisier and Amie Wilkinson | The centralizer of a C1 generic diffeomorphism is trivial | null | null | null | null | math.DS | null | In this announcement, we describe the solution in the C1 topology to a
question asked by S. Smale on the genericity of trivial centralizers: the set
of diffeomorphisms of a compact connected manifold with trivial centralizer
residual in Diff^1 but does not contain an open and dense subset.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 08:43:09 GMT"
},
{
"version": "v2",
"created": "Fri, 25 May 2007 12:45:56 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Bonatti",
"Christian",
""
],
[
"Crovisier",
"Sylvain",
""
],
[
"Wilkinson",
"Amie",
""
]
] |
0705.0226 | Eduardo Souza Fraga | E. S. Fraga, G. Krein, A. J. Mizher | Langevin dynamics of the pure SU(2) deconfining transition | 7 pages, 2 figures; v2: minor changes, published version | Phys.Rev.D76:034501,2007 | 10.1103/PhysRevD.76.034501 | null | hep-ph hep-lat | null | We investigate the dissipative real-time evolution of the order parameter for
the deconfining transition in the pure SU(2) gauge theory. The approach to
equilibrium after a quench to temperatures well above the critical one is
described by a Langevin equation. To fix completely the markovian Langevin
dynamics we choose the dissipation coefficient, that is a function of the
temperature, guided by preliminary Monte Carlo simulations for various
temperatures. Assuming a relationship between Monte Carlo time and real time,
we estimate the delay in thermalization brought about by dissipation and noise.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 13:45:41 GMT"
},
{
"version": "v2",
"created": "Thu, 30 Aug 2007 20:48:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fraga",
"E. S.",
""
],
[
"Krein",
"G.",
""
],
[
"Mizher",
"A. J.",
""
]
] |
0705.0227 | Graeme J. Ackland | Graeme J. Ackland, Richard D.L.Hanes, Morrel H. Cohen | Self assembly of a model multicellular organism resembling the
Dictyostelium slime molds | null | null | null | null | q-bio.CB q-bio.PE | null | The evolution of multicellular organisms from monocellular ancestors
represents one of the greatest advances of the history of life. The assembly of
such multicellular organisms requires signalling and response between cells:
over millions of years these signalling processes have become extremely
sophisticated and refined by evolution, such that study of modern organisms may
not be able to shed much light on the original ancient processes . Here we are
interested in determining how simple a signalling method can be, while still
achieving self-assembly. In 2D a coupled cellular automaton/differential
equation approach models organisms and chemotaxic chemicals, producing
spiralling aggregation. In 3D Lennard-Jones-like particles are used to
represent single cells, and their evolution in response to signalling is
followed by molecular dynamics. It is found that if a single cell is able to
emit a signal which induces others to move towards it, then a colony of
single-cell organisms can assemble into shapes as complex as a tower, a ball
atop a stalk, or a fast-moving slug. The similarity with the behaviour of
modern Dictyostelium slime molds signalling with cyclic adenosine monophosphate
(cAMP) is striking.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 08:45:54 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ackland",
"Graeme J.",
""
],
[
"Hanes",
"Richard D. L.",
""
],
[
"Cohen",
"Morrel H.",
""
]
] |
0705.0228 | Herbert Balasin | Herbert Balasin and Peter Aichelburg | Canonical Formulation of pp-waves | To appear in the "Obregon Festschrift" | Gen.Rel.Grav.39:1075-1085,2007 | 10.1007/s10714-007-0452-0 | null | gr-qc | null | We construct a Hamiltonian formulation for the class of plane-fronted
gravitational waves with parallel rays (pp-waves). Because of the existence of
a light-like Killing vector, the dynamics is effectively reduced to a 2+1
evolution with "time" chosen to be light-like. In spite of the vanishing action
this allows us to geometrically identify a symplectic form as well as dynamical
Hamiltonian, thus casting the system into canonical form.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 08:46:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Balasin",
"Herbert",
""
],
[
"Aichelburg",
"Peter",
""
]
] |
0705.0229 | Lars M. Johansen | Lars M. Johansen | Quantum theory of successive projective measurements | 6 pages | Phys. Rev. A76, 012119 (2007) | 10.1103/PhysRevA.76.012119 | null | quant-ph | null | We show that a quantum state may be represented as the sum of a joint
probability and a complex quantum modification term. The joint probability and
the modification term can both be observed in successive projective
measurements. The complex modification term is a measure of measurement
disturbance. A selective phase rotation is needed to obtain the imaginary part.
This leads to a complex quasiprobability, the Kirkwood distribution. We show
that the Kirkwood distribution contains full information about the state if the
two observables are maximal and complementary. The Kirkwood distribution gives
a new picture of state reduction. In a nonselective measurement, the
modification term vanishes. A selective measurement leads to a quantum state as
a nonnegative conditional probability. We demonstrate the special significance
of the Schwinger basis.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 08:47:59 GMT"
}
] | 2007-11-21T00:00:00 | [
[
"Johansen",
"Lars M.",
""
]
] |
0705.0230 | Olle Gunnarsson | O. Gunnarsson and K. Vafayi | Comment on ``Collapse of Coherent Quasiparticle States in
$\theta$-(BEDT-TTF)$_2$I$_3$ Observed by Optical Spectroscopy'' | 1 page, 1figure | null | 10.1103/PhysRevLett.98.219802 | null | cond-mat.mtrl-sci cond-mat.str-el | null | Recently, Takenaka et al. reported that the resistivity rho(T) of
theta-(BEDT-TTF)_2I_3 (theta-ET) exceeds the Ioffe-Regel resistivity by a
factor of 50 at large temperatures T (``bad metal''). This was ascribed to
strong correlation. We argue that the optical conductivity sigma(omega) implies
that correlation is not very strong, and that correlation gives no general
strong suppression of sigma(omega). The large rho(T) is primarily due to a
downturn in sigma(omega) at small omega, earlier emphasized by Takenaka et al.
as the explanation for bad metal behavior of high-T_c cuprates. We argue,
however, that for cuprates strong correlation is the main effect. The data of
Takenaka et al. puts theta-ET in a new class of bad metals.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 09:20:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gunnarsson",
"O.",
""
],
[
"Vafayi",
"K.",
""
]
] |
0705.0231 | Cristian Chumillas | C. Chumillas, G. Garbarino, A. Parreno and A. Ramos | Two-pion-exchange in the non-mesonic weak decay of $\Lambda$-hypernuclei | 20 pages, 3 figures Uses elsart.cls | Phys.Lett.B657:180-186,2007 | 10.1016/j.physletb.2007.08.094 | null | nucl-th | null | The non-mesonic weak decay of $\Lambda$--hypernuclei is studied within a
one-meson-exchange potential supplemented by a chirally motivated
two-pion-exchange mechanism. The effects of final state interactions on the
outgoing nucleons are also taken into account. In view of the severe
discrepancies between theoretical expectations and experimental data,
particular attention is payed to the asymmetry of the protons emitted by
polarized hypernuclei. The one-meson-exchange model describes the non-mesonic
rates and the neutron-to-proton ratio satisfactorily but predicts a too large
and negative asymmetry parameter. The uncorrelated and correlated two-pion
mechanisms change the rates moderately, thus maintaining the agreement with
experiment. The modification in the strength and sign of some decay amplitudes
becomes crucial and produces asymmetry parameters which lie well within the
experimental observations.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:45:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chumillas",
"C.",
""
],
[
"Garbarino",
"G.",
""
],
[
"Parreno",
"A.",
""
],
[
"Ramos",
"A.",
""
]
] |
0705.0232 | Kotub Uddin | Kotub Uddin, James E Lidsey and Reza Tavakol | Cosmological perturbations in Palatini modified gravity | null | Class.Quant.Grav.24:3951-3962,2007 | 10.1088/0264-9381/24/15/012 | null | gr-qc astro-ph | null | Two approaches to the study of cosmological density perturbations in modified
theories of Palatini gravity have recently been discussed. These utilise,
respectively, a generalisation of Birkhoff's theorem and a direct linearization
of the gravitational field equations. In this paper these approaches are
compared and contrasted. The general form of the gravitational lagrangian for
which the two frameworks yield identical results in the long-wavelength limit
is derived. This class of models includes the case where the lagrangian is a
power-law of the Ricci curvature scalar. The evolution of density perturbations
in theories of the type $f(R)=R-c /R^ b$ is investigated numerically. It is
found that the results obtained by the two methods are in good agreement on
sufficiently large scales when the values of the parameters (b,c) are
consistent with current observational constraints. However, this agreement
becomes progressively poorer for models that differ significantly from the
standard concordance model and as smaller scales are considered.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 09:10:33 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Jul 2007 13:07:56 GMT"
}
] | 2010-10-27T00:00:00 | [
[
"Uddin",
"Kotub",
""
],
[
"Lidsey",
"James E",
""
],
[
"Tavakol",
"Reza",
""
]
] |
0705.0233 | Jiangping Hu | Jiangping Hu, Yiguang Hong | Coordination for a Group of Autonomous Mobile Agents with Multiple
Leaders | 5 pages,7 figures | null | 10.1109/CHICC.2006.280978 | null | math-ph math.MP | null | In this paper, we consider the coordination control of a group of autonomous
mobile agents with multiple leaders. Different interconnection topologies are
investigated. At first, a necessary and sufficient condition is proved in the
case of fixed interconnection topology. Then a sufficient condition is proposed
when the interconnection topology is switched. With a simple first-order
dynamics model by using the neighborhood rule, both results show that the group
behavior of the agents will converge to the polytope formed by the leaders.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 09:16:19 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hu",
"Jiangping",
""
],
[
"Hong",
"Yiguang",
""
]
] |
0705.0234 | Fabrizio Tavecchio | F. Tavecchio, L. Maraschi, G. Ghisellini, J. Kataoka, L. Foschini,
R.M. Sambruna, G. Tagliaferri | Low energy cut-offs and hard X-ray spectra in high-z radio-loud quasars:
the Suzaku view of RBS315 | Accepted for publication in ApJ | Astrophys.J.665:980-989,2007 | 10.1086/519156 | null | astro-ph | null | We present the results from the Suzaku observation of the powerful radio-loud
quasar RBS315 (z=2.69), for which a previous XMM-Newton observation showed an
extremely flat X-ray continuum up to 10 keV (photon index Gamma=1.26) and
indications of strong intrinsic absorption (N_H~10^22 cm^{-2} assuming neutral
gas). The instrument for hard X-rays HXD/PIN allows us a detection of the
source up to 50 keV. The broad-band continuum (0.5-50 keV) can be well modeled
with a power-law with slope Gamma=1.5 (definitively softer than the continuum
measured by XMM-Newton) above 1 keV with strong deficit of soft photons. The
low-energy cut-off can be well fitted either with intrinsic absorption (with
column density N_H~10^22 cm^{-2} in the quasar rest frame) or with a break in
the continuum, with an extremely hard (Gamma =0.7) power-law below 1 keV. We
construct the Spectral Energy Distribution of the source, using also optical-UV
measurements obtained through a quasi-simultaneous UVOT/SWIFT observation. The
shape of the SED is similar to that of other Flat Spectrum Radio Quasars
(FSRQs) with similar power, making this source an excellent candidate for the
detection in gamma-rays by GLAST. We model the SED with the synchrotron-Inverse
Compton model usually applied to FSRQs, showing that the deficit of soft
photons can be naturally interpreted as due to an intrinsic curvature of the
spectrum near the low energy end of the IC component rather than to intrinsic
absorption, although the latter possibility cannot be ruled out. We propose
that in at least a fraction of the radio-loud QSOs at high redshift the cut-off
in the soft X-ray band can be explained in a similar way. Further studies are
required to distinguish between the two alternatives.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 09:27:47 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Tavecchio",
"F.",
""
],
[
"Maraschi",
"L.",
""
],
[
"Ghisellini",
"G.",
""
],
[
"Kataoka",
"J.",
""
],
[
"Foschini",
"L.",
""
],
[
"Sambruna",
"R. M.",
""
],
[
"Tagliaferri",
"G.",
""
]
] |
0705.0235 | Eyo Ita III | Eyo Eyo Ita III | Instanton representation of Plebanski gravity: Application to the
Schwarzchild metric | 22 pages. Background material for revised journal article | The Abraham Zelmanov Journal, 2011, Vol. 4 (pages 72-95) | null | DAMTP-2007-39 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we apply the instanton representation method to the
construction of spherically symmetric blackhole general relativity solutions.
The instanton representation implies the existence of additional Type D
solutions which are axially symmetric. We explicitly construct these solutions,
which are fully consistent with Birkhoff's theorem.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 09:33:14 GMT"
},
{
"version": "v2",
"created": "Wed, 21 Apr 2010 18:13:51 GMT"
},
{
"version": "v3",
"created": "Fri, 18 Mar 2011 02:46:14 GMT"
}
] | 2012-02-20T00:00:00 | [
[
"Ita",
"Eyo Eyo",
"III"
]
] |
0705.0236 | Georgi Ganchev | Georgi Ganchev, Ognian Kassabov | Hermitian manifolds of pointwise constant antiholomorphic sectional
curvatures | 7 pages | Serdica Math. J. 33 (2007), 377-386 | null | null | math.DG | null | In dimension greater than four, we prove that if a Hermitian non-Kaehler
manifold is of pointwise constant antiholomorphic sectional curvatures, then it
is of constant sectional curvatures.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 09:44:03 GMT"
}
] | 2007-07-23T00:00:00 | [
[
"Ganchev",
"Georgi",
""
],
[
"Kassabov",
"Ognian",
""
]
] |
0705.0237 | David Sanchez | David Sanchez, Charles Gould, Georg Schmidt, Laurens W. Molenkamp | Spin-polarized transport in II-VI magnetic resonant tunneling devices | 7 pages, 6 figures | IEEE Trans. Electron Devices 54, 984 (2007) | 10.1109/TED.2007.894373 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | We investigate electronic transport through II-VI semiconductor resonant
tunneling structures containing diluted magnetic impurities. Due to the
exchange interaction between the conduction electrons and the impurities, there
arises a giant Zeeman splitting in the presence of a moderately low magnetic
field. As a consequence, when the quantum well is magnetically doped the
current-voltage characteristics shows two peaks corresponding to transport for
each spin channel. This behavior is experimentally observed and can be
reproduced with a simple tunneling model. The model thus allows to analyze
other configurations. First, we further increase the magnetic field, which
leads to a spin polarization of the electronic current injected from the leads,
thus giving rise to a relative change in the current amplitude. We demonstrate
that the spin polarization in the emitter can be determined from such a change.
Furthermore, in the case of a magnetically doped injector our model shows a
large increase in peak amplitude and a shift of the resonance to higher
voltages as the external field increases. We find that this effect arises from
a combination of giant Zeeman splitting, 3-D incident distribution and broad
resonance linewidth.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 09:48:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sanchez",
"David",
""
],
[
"Gould",
"Charles",
""
],
[
"Schmidt",
"Georg",
""
],
[
"Molenkamp",
"Laurens W.",
""
]
] |
0705.0238 | Maurizio Falanga Dr. | Maurizio Falanga, Fulvio Melia, Michel Tagger, Andrea Goldwurm,
Guillaume Belanger | General Relativistic Flux Modulations from Disk Instabilities in
Sagittarius A* | 5 Pages, 3 Figures, accepted for publication in ApJ Letter | null | 10.1086/519278 | null | astro-ph | null | Near-IR and X-ray flares have been detected from the supermassive black hole
Sgr A* at the center of our Galaxy with a (quasi)-period of ~17-20 minutes,
suggesting an emission region only a few Schwarzschild radii above the event
horizon. The latest X-ray flare, detected with XMM-Newton, is notable for its
detailed lightcurve, yielding not only the highest quality period thus far, but
also important structure reflecting the geometry of the emitting region. Recent
MHD simulations of Sgr A*'s disk have demonstrated the growth of a Rossby wave
instability, that enhances the accretion rate for several hours, possibly
accounting for the observed flares. In this Letter, we carry out ray-tracing
calculations in a Schwarzschild metric to determine as accurately as possible
the lightcurve produced by general relativistic effects during such a
disruption. We find that the Rossby wave induced spiral pattern in the disk is
an excellent fit to the data, implying a disk inclination angle of ~77 deg.
Note, however, that if this association is correct, the observed period is not
due to the underlying Keplerian motion but, rather, to the pattern speed. The
favorable comparison between the observed and simulated lightcurves provides
important additional evidence that the flares are produced in Sgr A*'s inner
disk.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 09:53:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Falanga",
"Maurizio",
""
],
[
"Melia",
"Fulvio",
""
],
[
"Tagger",
"Michel",
""
],
[
"Goldwurm",
"Andrea",
""
],
[
"Belanger",
"Guillaume",
""
]
] |
0705.0239 | Gioacchino Ranucci | H.O. Back et al. (Borexino Collaboration) | Pulse-Shape discrimination with the Counting Test Facility | 39 pages, 17 figures, submitted to Nucl. Instr. Meth. A | Nucl.Instrum.Meth.A584:98-113,2008 | 10.1016/j.nima.2007.09.036 | null | physics.ins-det | null | Pulse shape discrimination (PSD) is one of the most distinctive features of
liquid scintillators. Since the introduction of the scintillation techniques in
the field of particle detection, many studies have been carried out to
characterize intrinsic properties of the most common liquid scintillator
mixtures in this respect. Several application methods and algorithms able to
achieve optimum discrimination performances have been developed. However, the
vast majority of these studies have been performed on samples of small
dimensions. The Counting Test Facility, prototype of the solar neutrino
experiment Borexino, as a 4 ton spherical scintillation detector immersed in
1000 tons of shielding water, represents a unique opportunity to extend the
small-sample PSD studies to a large-volume setup. Specifically, in this work we
consider two different liquid scintillation mixtures employed in CTF,
illustrating for both the PSD characterization results obtained either with the
processing of the scintillation waveform through the optimum Gatti's method, or
via a more conventional approach based on the charge content of the
scintillation tail. The outcomes of this study, while interesting per se, are
also of paramount importance in view of the expected Borexino detector
performances, where PSD will be an essential tool in the framework of the
background rejection strategy needed to achieve the required sensitivity to the
solar neutrino signals.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 09:57:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"al.",
"H. O. Back et",
"",
"Borexino Collaboration"
]
] |
0705.0240 | Ian Huston | James E. Lidsey and Ian Huston | Gravitational Wave Constraints on DBI Inflation | 18 pages; V2: added references, version as published in JCAP | JCAP0707:002,2007 | 10.1088/1475-7516/2007/07/002 | null | hep-th astro-ph gr-qc | null | An upper bound on the amplitude of the primordial gravitational wave spectrum
generated during ultra-violet DBI inflation is derived. The bound is
insensitive to the form of the inflaton potential and the warp factor of the
compactified dimensions and can be expressed entirely in terms of observational
parameters once the volume of the five-dimensional sub-manifold of the throat
has been specified. For standard type IIB compactification schemes, the bound
predicts undetectably small tensor perturbations with a tensor-scalar ratio $r
< 10^{-7}$. This is incompatible with a corresponding lower limit of $r > 0.1
(1-n_s)$, which applies to any model that generates a red spectral index $n_s
<1$ and a potentially detectable non-Gaussianity in the curvature perturbation.
Possible ways of evading these bounds in more general DBI-type scenarios are
discussed and a multiple-brane model is investigated as a specific example.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 09:57:18 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 12:18:06 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lidsey",
"James E.",
""
],
[
"Huston",
"Ian",
""
]
] |
0705.0241 | Miroslav Pardy | Miroslav Pardy | New paradox in the special theory of relativity generated by the string
dynamics | 3 pages | null | null | null | physics.class-ph | null | It is proved that the definition of simultaneity by Einstein leads to the
paradox motion of he string from the viewpoint of the observer in the inertial
system S' moving with velocity v with regard to the inertial system S.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 10:02:14 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Pardy",
"Miroslav",
""
]
] |
0705.0242 | Giampiero Esposito Dr. | Elisabetta Di Grezia, Giampiero Esposito, Gennaro Miele | The scalar wave equation in a non-commutative spherically symmetric
space-time | 19 pages, Revtex4, 7 figures | Int.J.Geom.Meth.Mod.Phys.5:33-47,2008 | 10.1142/S0219887808002631 | DSF 2007/14 | hep-th | null | Recent work in the literature has studied a version of non-commutative
Schwarzschild black holes where the effects of non-commutativity are described
by a mass function depending on both the radial variable r and a
non-commutativity parameter theta. The present paper studies the asymptotic
behaviour of solutions of the zero-rest-mass scalar wave equation in such a
modified Schwarzschild space-time in a neighbourhood of spatial infinity. The
analysis is eventually reduced to finding solutions of an inhomogeneous
Euler--Poisson--Darboux equation, where the parameter theta affects explicitly
the functional form of the source term. Interestingly, for finite values of
theta, there is full qualitative agreement with general relativity: the
conformal singularity at spacelike infinity reduces in a considerable way the
differentiability class of scalar fields at future null infinity. In the
physical space-time, this means that the scalar field has an asymptotic
behaviour with a fall-off going on rather more slowly than in flat space-time.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 10:07:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Di Grezia",
"Elisabetta",
""
],
[
"Esposito",
"Giampiero",
""
],
[
"Miele",
"Gennaro",
""
]
] |
0705.0243 | Hyunseok Jeong | Hyunseok Jeong, Jinhyoung Lee, and Hyunchul Nha | Decoherence of Highly Mixed Macroscopic Quantum Superpositions | 6 pages, 4 figures | J. Opt. Soc. Am. B, Vol. 25, Issue 6, pp. 1025-1030 (2008) | 10.1364/JOSAB.25.001025 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that a macroscopic quantum superposition (MQS), when it is
exposed to environment, decoheres at a rate scaling with the separation of its
component states in phase space. This is more or less consistent with the well
known proposition that a more macroscopic quantum state is reduced more quickly
to a classical state in general. Effects of initial mixedness, however, on the
subsequent decoherence of MQSs have been less known. In this paper, we study
the evolution of a highly mixed MQS interacting with an environment, and
compare it with that of a pure MQS having the same size of the central distance
between its component states. Although the decoherence develops more rapidly
for the mixed MQS in short times, its rate can be significantly suppressed
after a certain time and becomes smaller than the decoherence rate of its
corresponding pure MQS. In an optics experiment to generate a MQS, our result
has a practical implication that nonclassicality of a MQS can be still
observable in moderate times even though a large amount of noise is added to
the initial state.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 10:08:06 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Sep 2008 06:12:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jeong",
"Hyunseok",
""
],
[
"Lee",
"Jinhyoung",
""
],
[
"Nha",
"Hyunchul",
""
]
] |
0705.0244 | Farrukh Mukhamedov M. | A.Yu. Khrennikov, F. M. Mukhamedov, J. F.F. Mendes | On $p$-adic Gibbs measures of countable state Potts model on the Cayley
tree | 13 pages. submitted | Nonlinearity 20:2923-2937,2007 | 10.1088/0951-7715/20/12/010 | null | math-ph math.MP | null | In the present paper we consider countable state $p$-adic Potts model on the
Cayley tree. A construction of $p$-adic Gibbs measures which depends on weights
$\l$ is given, and an investigation of such measures is reduced to examination
of an infinite-dimensional recursion equation. Studying of the derived equation
under some condition on weights, we prove absence of the phase transition. Note
that the condition does not depend on values of the prime $p$, and an analogues
fact is not true when the number of spins is finite. For homogeneous model it
is shown that the recursive equation has only one solution under that condition
on weights. This means that there is only one $p$-adic Gibbs measure $\m_\l$.
The boundedness of the measure is also established. Moreover, continuous
dependence the measure $\m_\l$ on $\l$ is proved. At the end we formulate one
limit theorem for $\m_\l$.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 10:13:56 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Dec 2007 12:42:50 GMT"
}
] | 2010-11-04T00:00:00 | [
[
"Khrennikov",
"A. Yu.",
""
],
[
"Mukhamedov",
"F. M.",
""
],
[
"Mendes",
"J. F. F.",
""
]
] |
0705.0245 | F. Filthaut | F. Filthaut (for the D0 and CDF Collaborations) | Measurement of masses and lifetimes of B hadrons | 4 pages, 3 figures; added reference | null | null | Fermilab CONF-07-111-E | hep-ex | null | We present recent measurements by the CDF and D0 Collaborations at the
Tevatron Collider on the masses and lifetimes of B hadrons. The results are
compared to predictions based on Heavy Quark Effective Theory, lattice gauge
theory, and quark models.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 10:57:17 GMT"
},
{
"version": "v2",
"created": "Fri, 4 May 2007 07:06:06 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Filthaut",
"F.",
"",
"for the D0 and CDF Collaborations"
]
] |
0705.0246 | Valerio Bozza | V. Bozza, G. Scarpetta | Strong deflection limit of black hole gravitational lensing with
arbitrary source distances | 20 pages, 8 figures, appendix added. In press on Physical Review D | Phys.Rev.D76:083008,2007 | 10.1103/PhysRevD.76.083008 | null | gr-qc astro-ph | null | The gravitational field of supermassive black holes is able to strongly bend
light rays emitted by nearby sources. When the deflection angle exceeds $\pi$,
gravitational lensing can be analytically approximated by the so-called strong
deflection limit. In this paper we remove the conventional assumption of
sources very far from the black hole, considering the distance of the source as
an additional parameter in the lensing problem to be treated exactly. We find
expressions for critical curves, caustics and all lensing observables valid for
any position of the source up to the horizon. After analyzing the spherically
symmetric case we focus on the Kerr black hole, for which we present an
analytical 3-dimensional description of the higher order caustic tubes.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 10:39:43 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Sep 2007 10:44:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bozza",
"V.",
""
],
[
"Scarpetta",
"G.",
""
]
] |
0705.0247 | Martin Weimann | Martin Weimann | Concavity, Abel-transform and the Abel-inverse theorem in smooth
complete toric varieties | 27 pages. New version (modified introduction) | null | null | null | math.CV math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the usual projective Abel-Radon transform to the larger context of
a smooth complete toric variety X. We define and study toric concavity attached
to an algebraic splitting vector bundle on X and we prove a toric version of
the Abel-inverse theorem.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 10:40:02 GMT"
},
{
"version": "v2",
"created": "Fri, 27 Mar 2009 13:31:11 GMT"
}
] | 2009-03-27T00:00:00 | [
[
"Weimann",
"Martin",
""
]
] |
0705.0248 | Igor Pshenichnov | Igor Pshenichnov (Frankfurt U., FIAS and INR, Moscow), Igor Mishustin
(Frankfurt U., FIAS and Kurchatov Inst., Moscow), Walter Greiner (Frankfurt
U., FIAS) | MCHIT - Monte Carlo model for proton and heavy-ion therapy | Talk given at International Conference on Nuclear Data for Science
and Technology ND-2007, Nice, France, April 22-27, 2007 | International Conference on Nuclear Data for Science and
Technology 2007 | 10.1051/ndata:07214 | null | physics.med-ph | null | We study the propagation of nucleons and nuclei in tissue-like media within a
Monte Carlo Model for Heavy-ion Therapy (MCHIT) based on the GEANT4 toolkit
(version 8.2). The model takes into account fragmentation of projectile nuclei
and secondary interactions of produced nuclear fragments. Model predictions are
validated with available experimental data obtained for water and PMMA phantoms
irradiated by monoenergetic carbon-ion beams. The MCHIT model describes well
(1) the depth-dose distributions in water and PMMA, (2) the doses measured for
fragments of certain charge, (3) the distributions of positron emitting nuclear
fragments produced by carbon-ion beams, and (4) the energy spectra of secondary
neutrons measured at different angles to the beam direction. Radial dose
profiles for primary nuclei and for different projectile fragments are
calculated and discussed as possible input for evaluation of biological dose
distributions. It is shown that at the periphery of the transverse dose profile
close to the Bragg peak the dose from secondary nuclear fragments is comparable
to the dose from primary nuclei.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 10:44:45 GMT"
}
] | 2010-11-03T00:00:00 | [
[
"Pshenichnov",
"Igor",
"",
"Frankfurt U., FIAS and INR, Moscow"
],
[
"Mishustin",
"Igor",
"",
"Frankfurt U., FIAS and Kurchatov Inst., Moscow"
],
[
"Greiner",
"Walter",
"",
"Frankfurt\n U., FIAS"
]
] |
0705.0249 | Istvan Horvath | Z. Bagoly, I. Horvath, L.G. Balazs, L. Borgonovo, S. Larsson, A.
Meszaros, F. Ryde | Principal Component Analysis of Gamma-Ray Bursts' Spectra | published in Nuovo Cimento | Nuovo Cim.C28:295,2005 | 10.1393/ncc/i2005-10045-1 | null | astro-ph | null | Principal component analysis is a statistical method, which lowers the number
of important variables in a data set. The use of this method for the bursts'
spectra and afterglows is discussed in this paper. The analysis indicates that
three principal components are enough among the eight ones to describe the
variablity of the data. The correlation between spectral index alpha and the
redshift suggests that the thermal emission component becomes more dominant at
larger redshifts.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 10:46:28 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Bagoly",
"Z.",
""
],
[
"Horvath",
"I.",
""
],
[
"Balazs",
"L. G.",
""
],
[
"Borgonovo",
"L.",
""
],
[
"Larsson",
"S.",
""
],
[
"Meszaros",
"A.",
""
],
[
"Ryde",
"F.",
""
]
] |
0705.0250 | Andreas Axelsson | Pascal Auscher, Andreas Axelsson, Steve Hofmann | Functional calculus of Dirac operators and complex perturbations of
Neumann and Dirichlet problems | Some changes made in the introduction of the paper | null | null | null | math.AP math.SP | null | We prove that the Neumann, Dirichlet and regularity problems for divergence
form elliptic equations in the half space are well posed in $L_2$ for small
complex $L_\infty$ perturbations of a coefficient matrix which is either real
symmetric, of block form or constant. All matrices are assumed to be
independent of the transversal coordinate. We solve the Neumann, Dirichlet and
regularity problems through a new boundary operator method which makes use of
operators in the functional calculus of an underlaying first order Dirac type
operator. We establish quadratic estimates for this Dirac operator, which
implies that the associated Hardy projection operators are bounded and depend
continuously on the coefficient matrix. We also prove that certain transmission
problems for $k$-forms are well posed for small perturbations of block
matrices.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 10:58:45 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 15:00:45 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Auscher",
"Pascal",
""
],
[
"Axelsson",
"Andreas",
""
],
[
"Hofmann",
"Steve",
""
]
] |
0705.0251 | Belgacem Draouil Pr | Belgacem Draouil | Arithmetic of curves over two dimensional local field | null | null | null | null | math.AG math.NT | null | We study the class field theory of curve defined over two dimensional local
field. The approch used here is a combination of the work of Kato-Saito, and
Yoshida where the base field is one dimensional
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:11:35 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Draouil",
"Belgacem",
""
]
] |
0705.0252 | Khoa Nguyen | Khoa D. Nguyen, Albert Guillen i Fabregas and Lars K. Rasmussen | Power Allocation for Discrete-Input Non-Ergodic Block-Fading Channels | 6 pages, 4 figures, submitted to Information Theory Workshop 2007 | null | null | null | cs.IT math.IT | null | We consider power allocation algorithms for fixed-rate transmission over
Nakagami-m non-ergodic block-fading channels with perfect transmitter and
receiver channel state information and discrete input signal constellations
under both short- and long-term power constraints. Optimal power allocation
schemes are shown to be direct applications of previous results in the
literature. We show that the SNR exponent of the optimal short-term scheme is
given by the Singleton bound. We also illustrate the significant gains
available by employing long-term power constraints. Due to the nature of the
expressions involved, the complexity of optimal schemes may be prohibitive for
system implementation. We propose simple sub-optimal power allocation schemes
whose outage probability performance is very close to the minimum outage
probability obtained by optimal schemes.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:36:53 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 03:03:55 GMT"
},
{
"version": "v3",
"created": "Wed, 4 Jul 2007 13:10:52 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Nguyen",
"Khoa D.",
""
],
[
"Fabregas",
"Albert Guillen i",
""
],
[
"Rasmussen",
"Lars K.",
""
]
] |
0705.0253 | Jian Li | Mordecai Golin and Li Jian | More Efficient Algorithms and Analyses for Unequal Letter Cost
Prefix-Free Coding | 29 pages;9 figures; | null | null | null | cs.IT cs.DS math.IT | null | There is a large literature devoted to the problem of finding an optimal
(min-cost) prefix-free code with an unequal letter-cost encoding alphabet of
size. While there is no known polynomial time algorithm for solving it
optimally there are many good heuristics that all provide additive errors to
optimal. The additive error in these algorithms usually depends linearly upon
the largest encoding letter size.
This paper was motivated by the problem of finding optimal codes when the
encoding alphabet is infinite. Because the largest letter cost is infinite, the
previous analyses could give infinite error bounds. We provide a new algorithm
that works with infinite encoding alphabets. When restricted to the finite
alphabet case, our algorithm often provides better error bounds than the best
previous ones known.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:23:52 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 09:00:23 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Golin",
"Mordecai",
""
],
[
"Jian",
"Li",
""
]
] |
0705.0254 | Valery Lyubovitskij | Amand Faessler, Thomas Gutsche, Valery E. Lyubovitskij, Yong-Liang Ma | Strong and radiative decays of the Ds0*(2317) meson in the DK-molecule
picture | 22 pages, 4 figures, accepted for publication in Phys. Rev. D | Phys.Rev.D76:014005,2007 | 10.1103/PhysRevD.76.014005 | null | hep-ph | null | We consider a possible interpretation of the new charm-strange meson
Ds0*(2317) as a hadronic molecule - a bound state of D and K mesons. Using an
effective Lagrangian approach we calculate the strong Ds0* to Ds pi0 and
radiative Ds0* to Ds* gamma decays. A new impact related to the DK molecular
structure of the Ds0*(2317) meson is that the presence of u(d) quarks in the D
and K mesons gives rise to a direct strong isospin-violating transition Ds0* to
Ds pi0 in addition to the decay mechanism induced by eta-pi0 mixing considered
previously. We show that the direct transition dominates over the eta-pi0
mixing transition in the Ds0* to Ds pi0 decay. Our results for the partial
decay widths are consistent with previous calculations.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 13:18:39 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Jun 2007 09:37:08 GMT"
},
{
"version": "v3",
"created": "Tue, 10 Jul 2007 06:53:38 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Faessler",
"Amand",
""
],
[
"Gutsche",
"Thomas",
""
],
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Ma",
"Yong-Liang",
""
]
] |
0705.0255 | Osamu Narikiyo | O. Narikiyo | Note on the inelastic neutron scattering spectrum in cuprate
superconductors | In v2 the discussion on the consistency with recent rigorous
theoretical result on ARPES is added in Appendix | null | null | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inelastic neutron scattering spectrum in cuprate superconductors is
discussed on the basis of the itinerant-localized duality model for strongly
correlated electrons. In Appendix the consistency with recent rigorous
theoretical result on ARPES is discussed.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:33:39 GMT"
},
{
"version": "v2",
"created": "Mon, 29 Aug 2016 07:12:29 GMT"
}
] | 2016-08-30T00:00:00 | [
[
"Narikiyo",
"O.",
""
]
] |
0705.0256 | Henrik Schlichtkrull | Gestur Olafsson, Henrik Schlichtkrull | A local Paley-Wiener theorem for compact symmetric spaces | null | Advances in Mathematics 218 (2008), 202-215 | null | null | math.RT | null | The Fourier coefficients of a smooth $K$-invariant function on a compact
symmetric space $M=U/K$ are given by integration of the function against the
spherical functions. For functions with support in a neighborhood of the
origin, we describe the size of the support by means of the exponential type of
a holomorphic extension of the Fourier coefficients
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:36:23 GMT"
}
] | 2010-02-23T00:00:00 | [
[
"Olafsson",
"Gestur",
""
],
[
"Schlichtkrull",
"Henrik",
""
]
] |
0705.0257 | Krishnendu Sengupta | K. Sengupta and G. Baskaran | Tuning Kondo physics in Graphene with gate voltage | 4 pages, 1 figure; v2 | Phys. Rev. B 77, 045417 (2007). | 10.1103/PhysRevB.77.045417 | null | cond-mat.str-el | null | We show theoretically that graphene, which exhibits a massless Dirac like
spectrum for its electrons, can exhibit unconventional Kondo effect that can be
tuned by an experimentally controllable applied gate voltage. We demonstrate
the presence of a finite critical Kondo coupling strength in neutral graphene.
We discuss the possibility of multichannel Kondo effect in this system which
might lead to a non-Fermi liquid like ground state and provide a discussion of
possible experimental realization of Kondo phenomenon in graphene.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:39:09 GMT"
},
{
"version": "v2",
"created": "Fri, 4 May 2007 08:52:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sengupta",
"K.",
""
],
[
"Baskaran",
"G.",
""
]
] |
0705.0258 | Andrey Slavnov A | A.A.Slavnov | A local gauge invariant infrared regularization of the Yang-Mills theory | 7 pages | Theor.Math.Phys.154:178-183,2008 | 10.1007/s11232-008-0017-8 | null | hep-th hep-ph | null | A local gauge invariant infrared regularization for the Yang-Mills theory is
constructed on the basis of a higher derivative formulation of the model.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:43:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Slavnov",
"A. A.",
""
]
] |
0705.0259 | Peter Blake | P. Blake, K. S. Novoselov, A. H. Castro Neto, D. Jiang, R. Yang, T. J.
Booth, A. K. Geim, E. W. Hill | Making graphene visible | Since v1: minor changes to text and figures to improve clarity;
references added. Submitted to Applied Physics Letters, 30-Apr-07. 3 pages, 3
figures | Appl. Phys. Lett. 91, 063124 (2007) | 10.1063/1.2768624 | null | cond-mat.mes-hall cond-mat.other | null | Microfabrication of graphene devices used in many experimental studies
currently relies on the fact that graphene crystallites can be visualized using
optical microscopy if prepared on top of silicon wafers with a certain
thickness of silicon dioxide. We study graphene's visibility and show that it
depends strongly on both thickness of silicon dioxide and light wavelength. We
have found that by using monochromatic illumination, graphene can be isolated
for any silicon dioxide thickness, albeit 300 nm (the current standard) and,
especially, approx. 100 nm are most suitable for its visual detection. By using
a Fresnel-law-based model, we quantitatively describe the experimental data
without any fitting parameters.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:44:12 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Sep 2007 19:44:28 GMT"
},
{
"version": "v3",
"created": "Sat, 22 Sep 2007 12:14:22 GMT"
}
] | 2007-09-22T00:00:00 | [
[
"Blake",
"P.",
""
],
[
"Novoselov",
"K. S.",
""
],
[
"Neto",
"A. H. Castro",
""
],
[
"Jiang",
"D.",
""
],
[
"Yang",
"R.",
""
],
[
"Booth",
"T. J.",
""
],
[
"Geim",
"A. K.",
""
],
[
"Hill",
"E. W.",
""
]
] |
0705.0260 | Karin \"Oberg | Karin I. Oberg, Guido W. Fuchs, Zainab Awad, Helen J. Fraser, Stephan
Schlemmer, Ewine F. van Dishoeck and Harold Linnartz | Photodesorption of CO ice | 5 pages, 4 figures, accepted by ApJL | null | null | null | astro-ph | null | At the high densities and low temperatures found in star forming regions, all
molecules other than H2 should stick on dust grains on timescales shorter than
the cloud lifetimes. Yet these clouds are detected in the millimeter lines of
gaseous CO. At these temperatures, thermal desorption is negligible and hence a
non-thermal desorption mechanism is necessary to maintain molecules in the gas
phase. Here, the first laboratory study of the photodesorption of pure CO ice
under ultra high vacuum is presented, which gives a desorption rate of 3E-3 CO
molecules per UV (7-10.5 eV) photon at 15 K. This rate is factors of 1E2-1E5
larger than previously estimated and is comparable to estimates of other
non-thermal desorption rates. The experiments constrains the mechanism to a
single photon desorption process of ice surface molecules. The measured
efficiency of this process shows that the role of CO photodesorption in
preventing total removal of molecules in the gas has been underestimated.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:47:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Oberg",
"Karin I.",
""
],
[
"Fuchs",
"Guido W.",
""
],
[
"Awad",
"Zainab",
""
],
[
"Fraser",
"Helen J.",
""
],
[
"Schlemmer",
"Stephan",
""
],
[
"van Dishoeck",
"Ewine F.",
""
],
[
"Linnartz",
"Harold",
""
]
] |
0705.0261 | Vahid Karimipour | M. Asoudeh, V. Karimipour and A. Sadrolashrafi | Exact dimer ground states for a continuous family of quantum spin chains | 11 pages | Phys. Rev. B 76, 064433 (2007). | 10.1103/PhysRevB.76.064433 | null | cond-mat.str-el quant-ph | null | Using the matrix product formalism, we define a multi-parameter family of
spin models on one dimensional chains, with nearest and next-nearest neighbor
anti-ferromagnetic interaction for which exact analytical expressions can be
found for its doubly degenerate ground states. The family of Hamiltonians which
we define, depend on 5 continuous parameters and the Majumdar-Ghosh model is a
particular point in this parameter space. Like the Majumdar-Ghosh model, the
doubly degenerate ground states of our models have a very simple structure,
they are the product of entangled states on adjacent sites. In each of these
states there is a non-zero staggered magnetization, which vanishes when we take
their translation-invariant combination as the new ground states. At the
Majumdar-Ghosh point, these entangled states become the spin-singlets
pertaining to this model. We will also calculate in closed form the two point
correlation functions, both for finite size of the chain and in the
thermodynamic limit.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 17:02:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Asoudeh",
"M.",
""
],
[
"Karimipour",
"V.",
""
],
[
"Sadrolashrafi",
"A.",
""
]
] |
0705.0262 | Thierry Cachat | Thierry Cachat (LIAFA), Igor Walukiewicz (LaBRI) | The Complexity of Games on Higher Order Pushdown Automata | null | null | null | null | cs.GT | null | We prove an n-EXPTIME lower bound for the problem of deciding the winner in a
reachability game on Higher Order Pushdown Automata (HPDA) of level n. This
bound matches the known upper bound for parity games on HPDA. As a consequence
the mu-calculus model checking over graphs given by n-HPDA is n-EXPTIME
complete.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:48:52 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cachat",
"Thierry",
"",
"LIAFA"
],
[
"Walukiewicz",
"Igor",
"",
"LaBRI"
]
] |
0705.0263 | Lucas Ament | Filomena Forte, Luuk J. P. Ament and Jeroen van den Brink | Magnetic Excitations in La2CuO4 probed by Indirect Resonant Inelastic
X-ray Scattering | 11 pages, 13 figures, Phys. Rev. B 77, 134428 (2008) (v4: corrected
figs 7) | Phys. Rev. B 77, 134428 (2008) | 10.1103/PhysRevB.77.134428 | null | cond-mat.str-el | null | Recent experiments on La$_2$CuO$_4$ suggest that indirect resonant inelastic
X-ray scattering (RIXS) might provide a probe for transversal spin dynamics. We
present in detail a systematic expansion of the relevant magnetic RIXS cross
section by using the ultrashort core-hole lifetime (UCL) approximation. We
compute the scattering intensity and its momentum dependence in leading order
of the UCL expansion. The scattering is due to two-magnon processes and is
calculated within a linear spin-wave expansion of the Heisenberg spin model for
this compound, including longer range and cyclic spin interactions. We observe
that the latter terms in the Hamiltonian enhance the first moment of the
spectrum if they strengthen the antiferromagnetic ordering. The theoretical
spectra agree very well with experimental data, including the observation that
scattering intensity vanishes for the transferred momenta ${\bf q} = (0,0)$ and
${\bf q} = (\pi,\pi)$. We show that at finite temperature there is an
additional single-magnon contribution to the scattering with a spectral weight
proportional to $T^3$. We also compute the leading corrections to the UCL
approximation and find them to be small, putting the UCL results on a solid
basis. All this univocally points to the conclusion that the observed low
temperature RIXS intensity in La$_2$CuO$_4$ is due to two-magnon scattering.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:28:38 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Oct 2007 13:30:05 GMT"
},
{
"version": "v3",
"created": "Thu, 20 Dec 2007 16:33:54 GMT"
},
{
"version": "v4",
"created": "Mon, 21 Apr 2008 16:07:25 GMT"
}
] | 2011-07-22T00:00:00 | [
[
"Forte",
"Filomena",
""
],
[
"Ament",
"Luuk J. P.",
""
],
[
"Brink",
"Jeroen van den",
""
]
] |
0705.0264 | Nigel Glover | S. D. Badger (Saclay, SPhT), E. W. N. Glover (IPPP, Durham U.), Kasper
Risager (Bohr Inst.) | Higgs Amplitudes From Twistor Inspired Methods | 4 pages, two figures, based on talks given at the Cracow Epiphany
Conference on Precision Physics and Monte Carlos for LHC 4 - 6 January 2007,
Cracow, Poland and the 42nd Rencontres de Moriond QCD and High Energy
Hadronic Interactions, March 17-24, La Thuile, Italy | ActaPhys.Polon.B38:2273-2278,2007 | null | IPPP/07/15, SACLAY-SPHT-T07/051 | hep-ph | null | We illustrate the use of new on-shell methods, 4-dimensional unitarity cuts
combined with on-shell recursions relations, by computing the
A_4^{(1)}(phi,1^-,2^-,3^+,4^+) amplitude in the large top mass limit where the
Higgs boson couples to gluons through an effective interaction.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:52:09 GMT"
},
{
"version": "v2",
"created": "Wed, 9 May 2007 21:08:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Badger",
"S. D.",
"",
"Saclay, SPhT"
],
[
"Glover",
"E. W. N.",
"",
"IPPP, Durham U."
],
[
"Risager",
"Kasper",
"",
"Bohr Inst."
]
] |
0705.0265 | Hyeonjoon Shin | Hyeonjoon Shin, Wontae Kim | Hawking Radiation from Non-Extremal D1-D5 Black Hole via Anomalies | 14 pages | JHEP 0706:012,2007 | 10.1088/1126-6708/2007/06/012 | CQUeST-2007-0081 | hep-th | null | We take the method of anomaly cancellation for the derivation of Hawking
radiation initiated by Robinson and Wilczek, and apply it to the non-extremal
five-dimensional D1-D5 black hole in string theory. The fluxes of the electric
charge flow and the energy-momentum tensor from the black hole are obtained.
They are shown to match exactly with those of the two-dimensional black body
radiation at the Hawking temperature.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:55:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shin",
"Hyeonjoon",
""
],
[
"Kim",
"Wontae",
""
]
] |
0705.0266 | Eric Josselin | E. Josselin, B. Plez | Atmospheric dynamics and the mass loss process in red supergiant stars | Accepted by Astronomy and Astrophysics. 12 pages, 14 figures | null | 10.1051/0004-6361:20066353 | null | astro-ph | null | Red supergiant stars represent a key phase in the evolution of massive stars.
Recent radiative hydrodynamic simulations suggest that their atmospheres may be
the location of large-scale convective motions. As supergiant convection is
expected to generate supersonic motions and shocks, we seek constraints on
these atmospheric motions and their possible relation with mass-loss rates. We
present high-resolution, visible spectroscopy of a sample of red supergiants
(spectral type M I) and analyse them with a tomographic technique. We observe
steep velocity gradients, characterising both upward and downward supersonic
motions, which are time variable on time scales of a few hundred days. These
convective motions will generate turbulent pressure, which will strongly
decrease the effective gravity. We suggest that this decrease, combined with
radiative pressure on molecular lines, initiate the mass loss in red supergiant
stars.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 11:58:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Josselin",
"E.",
""
],
[
"Plez",
"B.",
""
]
] |
0705.0267 | Laura Mersini-Houghton | L.Mersini-Houghton and L.Parker | Eternal Inflation is "Expensive" | 3 pgs | null | null | null | hep-th astro-ph gr-qc hep-ph | null | The discovery of the string theory landscape has recently brought attention
to the eternal nature of inflation. In contrast to the common belief that
eternal inflation may be a generic feature of most inflationary models, in this
note we argue that the suppressed amplitude of perturbations due to adiabatic
regularization, together with a fine-tuning constraint on the equation of state
of the rare inflating pockets with large fluctuations, render eternal inflation
expensive in energy and may make it unlikely to occur. The energy scales of the
eternally inflating pockets have to be very close to the transplanckian regime
in order to compensate for the suppression of regularized perturbations.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:12:23 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Mersini-Houghton",
"L.",
""
],
[
"Parker",
"L.",
""
]
] |
0705.0268 | Elcio Abdalla | Elcio Abdalla and Bin Wang | The mass and the coupling of the Dark Particle | 5 psges, no figure | Phys.Lett.B651:89-91,2007 | 10.1016/j.physletb.2007.06.018 | null | gr-qc | null | We argue that Dark Matter can be described by an interacting field theory
with a mass parameter of the order of the proton mass and an interaction
coupling of the order of the QED coupling.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:15:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Abdalla",
"Elcio",
""
],
[
"Wang",
"Bin",
""
]
] |
0705.0269 | Robert Tibshirani | Trevor Hastie, Jonathan Taylor, Robert Tibshirani, Guenther Walther | Forward stagewise regression and the monotone lasso | Published at http://dx.doi.org/10.1214/07-EJS004 in the Electronic
Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Electronic Journal of Statistics 2007, Vol. 1, 1-29 | 10.1214/07-EJS004 | IMS-EJS-EJS_2007_4 | math.ST stat.TH | null | We consider the least angle regression and forward stagewise algorithms for
solving penalized least squares regression problems. In Efron, Hastie,
Johnstone & Tibshirani (2004) it is proved that the least angle regression
algorithm, with a small modification, solves the lasso regression problem. Here
we give an analogous result for incremental forward stagewise regression,
showing that it solves a version of the lasso problem that enforces
monotonicity. One consequence of this is as follows: while lasso makes optimal
progress in terms of reducing the residual sum-of-squares per unit increase in
$L_1$-norm of the coefficient $\beta$, forward stage-wise is optimal per unit
$L_1$ arc-length traveled along the coefficient path. We also study a condition
under which the coefficient paths of the lasso are monotone, and hence the
different algorithms coincide. Finally, we compare the lasso and forward
stagewise procedures in a simulation study involving a large number of
correlated predictors.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:21:59 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hastie",
"Trevor",
""
],
[
"Taylor",
"Jonathan",
""
],
[
"Tibshirani",
"Robert",
""
],
[
"Walther",
"Guenther",
""
]
] |
0705.0270 | Jens Harting | Christian Kunert, Jens Harting | Roughness induced boundary slip in microchannel flows | 4 pages, 6 figures | Physical Review Letters 99, 176001 (2007) | 10.1103/PhysRevLett.99.176001 | null | cond-mat.soft physics.flu-dyn | null | Surface roughness becomes relevant if typical length scales of the system are
comparable to the scale of the variations as it is the case in microfluidic
setups. Here, an apparent boundary slip is often detected which can have its
origin in the assumption of perfectly smooth boundaries. We investigate the
problem by means of lattice Boltzmann (LB) simulations and introduce an
``effective no-slip plane'' at an intermediate position between peaks and
valleys of the surface. Our simulations show good agreement with analytical
results for sinusoidal boundaries, but can be extended to arbitrary geometries
and experimentally obtained surface data. We find that the detected apparent
slip is independent of the detailed boundary shape, but only given by the
distribution of surface heights. Further, we show that the slip diverges as the
amplitude of the roughness increases.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:27:29 GMT"
}
] | 2008-06-24T00:00:00 | [
[
"Kunert",
"Christian",
""
],
[
"Harting",
"Jens",
""
]
] |
0705.0271 | Mikko Leskinen | M. J. Leskinen, J. Kinnunen, P. Torma | Pairing based cooling of Fermi gases | Journal version 4 pages, 4 figures | Phys. Rev. A 76, 021604(R) 2007 | 10.1103/PhysRevA.76.021604 | NSF-KITP-07-101 | cond-mat.other cond-mat.supr-con | null | We propose a pairing-based method for cooling an atomic Fermi gas. A three
component (labels 1, 2, 3) mixture of Fermions is considered where the
components 1 and 2 interact and, for instance, form pairs whereas the component
3 is in the normal state. For cooling, the components 2 and 3 are coupled by an
electromagnetic field. Since the quasiparticle distributions in the paired and
in the normal states are different, the coupling leads to cooling of the normal
state even when initially $T_{paired}\geq T_{normal}$ (notation $T_S\geq T_N$).
The cooling efficiency is given by the pairing energy and by the linewidth of
the coupling field. No superfluidity is required: any type of pairing, or other
phenomenon that produces a suitable spectral density, is sufficient. In
principle, the paired state could be cooled as well but this requires
$T_N<T_S$. The method has a conceptual analogy to cooling based on
superconductor -- normal metal (SN) tunneling junctions. Main differences arise
from the exact momentum conservation in the case of the field-matter coupling
vs. non-conservation of momentum in the solid state tunneling process.
Moreover, the role of processes that relax the energy conservation requirement
in the tunneling, e.g. thermal fluctuations of an external reservoir, is now
played by the linewidth of the field. The proposed method should be
experimentally feasible due to its close connection to RF-spectroscopy of
ultracold gases which is already in use.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:52:29 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Aug 2007 11:21:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Leskinen",
"M. J.",
""
],
[
"Kinnunen",
"J.",
""
],
[
"Torma",
"P.",
""
]
] |
0705.0272 | John Barnes | J.R. Barnes, C.J. Leigh, H.R.A. Jones, Travis S. Barman, D.J.
Pinfield, A. Collier Cameron and J.S. Jenkins | Near infrared spectroscopic search for the close orbiting planet HD
75289b | null | Mon.Not.Roy.Astron.Soc.379:1097-1107,2007 | 10.1111/j.1365-2966.2007.11990.x | null | astro-ph | null | We present a search for the near infrared spectroscopic signature of the
close orbiting extrasolar giant planet HD 75289b. We obtained ~230 spectra in
the wavelength range 2.18 - 2.19 microns using the Phoenix spectrograph at
Gemini South. By considering the direct spectrum, derived from irradiated model
atmospheres, we search for the absorption profile signature present in the
combined star and planet light. Since the planetary spectrum is separated from
the stellar spectrum at most phases, we apply a phase dependent orbital model
and tomographic techniques to search for absorption signatures.
Because the absorption signature lies buried in the noise of a single
exposure we apply a multiline deconvolution to the spectral lines available in
order to boost the effective S/N ratio of the data. The wavelength coverage of
80 angstroms is expected to contain ~100 planetary lines, enabling a mean line
with S/N ratio of ~800 to be achieved after deconvolution. We are nevertheless
unable to detect the presence of the planet in the data and carry out further
simulations to show that broader wavelength coverage should enable a planet
like HD 75289b to be detected with 99.9 per cent (4 sigma) confidence. We
investigate the sensitivity of our method and estimate detection tolerances for
mismatches between observed and model planetary atmospheres.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:30:30 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Barnes",
"J. R.",
""
],
[
"Leigh",
"C. J.",
""
],
[
"Jones",
"H. R. A.",
""
],
[
"Barman",
"Travis S.",
""
],
[
"Pinfield",
"D. J.",
""
],
[
"Cameron",
"A. Collier",
""
],
[
"Jenkins",
"J. S.",
""
]
] |
0705.0273 | Filiberto Braglia | Filiberto Braglia, Daniele Pierini, Hans B\"ohringer
(Max-Planck-Institut f\"ur extraterrestrische Physik) | Flaming, bright galaxies along the filaments of A2744 | 10 pages, 6 figures; accepted for publication in A&A | null | 10.1051/0004-6361:20077257 | null | astro-ph | null | The existence of a clumpy, large-scale filamentary structure is at the basis
of the current paradigm of cosmic formation and evolution of clusters. The
star-formation history of galaxies falling into a cluster is altered as a
result of the environmental stresses. We investigate the relation between
substructure and properties of the galaxy population in a 30'x30' region
centered on the massive merging cluster A2744 at z~0.3. Multi-object
spectroscopy at low resolution and BVR photometry are used to detect the
presence of substructure through a Dressler-Schectman analysis and the
photometric redshift technique, respectively. Galaxies at the same photometric
redshift of the cluster are divided into red and blue according to their
distribution in the B-R vs. R colour-magnitude diagram. We identify two
large-scale filaments associated with A2744. Along these filaments, the
blue-to-red galaxy number ratio increases together with the cluster-centric
distance but peaks slightly beyond the cluster virial radius. The filaments
host a population of bright, large (i.e. more luminous than R* for the main
body of the cluster and with angular sizes of 13-22 $h_{70}^{-1}$ kpc) blue
galaxies that is hardly found among galaxies lying in a neighbouring
low-density environment at the same redshift of the cluster. These results can
be interpreted as a manifestation of galaxy harassment.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:30:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Braglia",
"Filiberto",
"",
"Max-Planck-Institut für extraterrestrische Physik"
],
[
"Pierini",
"Daniele",
"",
"Max-Planck-Institut für extraterrestrische Physik"
],
[
"Böhringer",
"Hans",
"",
"Max-Planck-Institut für extraterrestrische Physik"
]
] |
0705.0274 | Dominique Picard | G\'erard Kerkyacharian, Pencho Petrushev, Dominique Picard, Thomas
Willer | Needlet algorithms for estimation in inverse problems | Published at http://dx.doi.org/10.1214/07-EJS014 in the Electronic
Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Electronic Journal of Statistics 2007, Vol. 1, 30-76 | 10.1214/07-EJS014 | IMS-EJS-EJS_2007_14 | math.ST stat.TH | null | We provide a new algorithm for the treatment of inverse problems which
combines the traditional SVD inversion with an appropriate thresholding
technique in a well chosen new basis. Our goal is to devise an inversion
procedure which has the advantages of localization and multiscale analysis of
wavelet representations without losing the stability and computability of the
SVD decompositions. To this end we utilize the construction of localized frames
(termed "needlets") built upon the SVD bases. We consider two different
situations: the "wavelet" scenario, where the needlets are assumed to behave
similarly to true wavelets, and the "Jacobi-type" scenario, where we assume
that the properties of the frame truly depend on the SVD basis at hand (hence
on the operator). To illustrate each situation, we apply the estimation
algorithm respectively to the deconvolution problem and to the Wicksell
problem. In the latter case, where the SVD basis is a Jacobi polynomial basis,
we show that our scheme is capable of achieving rates of convergence which are
optimal in the $L_2$ case, we obtain interesting rates of convergence for other
$L_p$ norms which are new (to the best of our knowledge) in the literature, and
we also give a simulation study showing that the NEED-D estimator outperforms
other standard algorithms in almost all situations.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:46:00 GMT"
}
] | 2016-08-14T00:00:00 | [
[
"Kerkyacharian",
"Gérard",
""
],
[
"Petrushev",
"Pencho",
""
],
[
"Picard",
"Dominique",
""
],
[
"Willer",
"Thomas",
""
]
] |
0705.0275 | Joachim Albrecht | Joachim Albrecht | An analytic KAM-Theorem | 48 pages | null | null | null | math.SG math.DS | null | We prove an analytic KAM-Theorem, which is used in [1], where the
differential part of KAM-theory is discussed. Related theorems on analytic
KAM-theory exist in the literature (e. g., among many others, [7], [8], [13]).
The aim of the theorem presented here is to provide exactly the estimates
needed in [1].
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:10:51 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Albrecht",
"Joachim",
""
]
] |
0705.0276 | Valentyna A. Groza | Valentyna A. Groza | Degenerate Series Representations of the $q$-Deformed Algebra ${\rm
so}'_q(r,s)$ | Published in SIGMA (Symmetry, Integrability and Geometry: Methods and
Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 3 (2007), 064, 12 pages | 10.3842/SIGMA.2007.064 | null | math.QA math-ph math.MP math.RT | null | The q-deformed algebra ${\rm so}'_q(r,s)$ is a real form of the q-deformed
algebra $U'_q({\rm so}(n,\mathbb{C}))$, $n=r+s$, which differs from the quantum
algebra $U_q({\rm so}(n,\mathbb{C}))$ of Drinfeld and Jimbo. We study
representations of the most degenerate series of the algebra ${\rm
so}'_q(r,s)$. The formulas of action of operators of these representations upon
the basis corresponding to restriction of representations onto the subalgebra
${\rm so}'_q(r)\times {\rm so}'_q(s)$ are given. Most of these representations
are irreducible. Reducible representations appear under some conditions for the
parameters determining the representations. All irreducible constituents which
appear in reducible representations of the degenerate series are found. All
$*$-representations of ${\rm so}'_q(r,s)$ are separated in the set of
irreducible representations obtained in the paper.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:37:23 GMT"
}
] | 2008-04-24T00:00:00 | [
[
"Groza",
"Valentyna A.",
""
]
] |
0705.0277 | Jun-ichiro Ohe | Jun-ichiro Ohe, Akihito Takeuchi and Gen Tatara | Charge current driven by spin dynamics in disordered Rashba spin-orbit
system | 6 pages, 4 figures | Phys. Rev. Lett. 99, 266603 (2007) | 10.1103/PhysRevLett.99.266603 | null | cond-mat.mes-hall | null | Pumping of charge current by spin dynamics in the presence of the Rashba
spin-orbit interaction is theoretically studied. Considering disordered
electron, the exchange coupling and spin-orbit interactions are treated
perturbatively. It is found that dominant current induced by the spin dynamics
is interpreted as a consequence of the conversion from spin current via the
inverse spin Hall effect. We also found that the current has an additional
component from a fictitious conservative field. Results are applied to the case
of moving domain wall.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:51:38 GMT"
},
{
"version": "v2",
"created": "Wed, 9 May 2007 12:44:23 GMT"
},
{
"version": "v3",
"created": "Mon, 28 Jan 2008 01:27:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ohe",
"Jun-ichiro",
""
],
[
"Takeuchi",
"Akihito",
""
],
[
"Tatara",
"Gen",
""
]
] |
0705.0278 | David Iglesias Ponte | D. Iglesias, J.C. Marrero, D. Martin de Diego, D. Sosa | A general framework for nonholonomic mechanics: Nonholonomic Systems on
Lie affgebroids | 50 pages | null | 10.1063/1.2776845 | null | math-ph math.DG math.MP | null | This paper presents a geometric description of Lagrangian and Hamiltonian
systems on Lie affgebroids subject to affine nonholonomic constraints. We
define the notion of nonholonomically constrained system, and characterize
regularity conditions that guarantee that the dynamics of the system can be
obtained as a suitable projection of the unconstrained dynamics. It is shown
that one can define an almost aff-Poisson bracket on the constraint AV-bundle,
which plays a prominent role in the description of nonholonomic dynamics.
Moreover, these developments give a general description of nonholonomic systems
and the unified treatment permits to study nonholonomic systems after or before
reduction in the same framework. Also, it is not necessary to distinguish
between linear or affine constraints and the methods are valid for explicitly
time-dependent systems.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:47:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Iglesias",
"D.",
""
],
[
"Marrero",
"J. C.",
""
],
[
"de Diego",
"D. Martin",
""
],
[
"Sosa",
"D.",
""
]
] |
0705.0279 | Fu-Guo Deng | Fu-Guo Deng, Xi-Han Li, and Hong-Yu Zhou | Opaque Attack on Three-Party Quantum Secret Sharing Based on
Entanglement | 4 pages, no figures | null | null | null | quant-ph | null | Security of the three-party quantum secret sharing (QSS) schemes based on
entanglement and a collective eavesdropping check is analyzed in the case of
considerable quantum channel losses. An opaque attack scheme is presented for
the dishonest agent to eavesdrop the message obtained by the other agent
freely, which reveals that these QSS schemes are insecure for transmission
efficiencies lower than 50%, especially when they are used to share an unknown
quantum state. Finally, we present a general way to improve the security of QSS
schemes for sharing not only a private key but also an unknown quantum state.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:48:34 GMT"
},
{
"version": "v2",
"created": "Sat, 5 May 2007 08:33:55 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Deng",
"Fu-Guo",
""
],
[
"Li",
"Xi-Han",
""
],
[
"Zhou",
"Hong-Yu",
""
]
] |
0705.0280 | Frederic Nataf | Sylvain Desroziers, Fr\'ed\'eric Nataf (LJLL), Remi Sentis | Simulation of Laser Propagation in a Plasma with a Frequency Wave
Equation | null | null | 10.1016/j.jcp.2007.11.008 | null | math.NA | null | The aim of this work is to perform numerical simulations of the propagation
of a laser in a plasma. At each time step, one has to solve a Helmholtz
equation in a domain which consists in some hundreds of millions of cells. To
solve this huge linear system, one uses a iterative Krylov method with a
preconditioning by a separable matrix. The corresponding linear system is
solved with a block cyclic reduction method. Some enlightments on the parallel
implementation are also given. Lastly, numerical results are presented
including some features concerning the scalability of the numerical method on a
parallel architecture.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:49:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Desroziers",
"Sylvain",
"",
"LJLL"
],
[
"Nataf",
"Frédéric",
"",
"LJLL"
],
[
"Sentis",
"Remi",
""
]
] |
0705.0281 | Jerome Darmont | J\'er\^ome Darmont (LIMOS), Christophe Fromantin (LIMOS), St\'ephane
R\'egnier (LIMOS), Le Gruenwald, Michel Schneider (LIMOS) | Dynamic Clustering in Object-Oriented Databases: An Advocacy for
Simplicity | null | LNCS, Vol. 1944 (06/2000) 71-85 | null | null | cs.DB | null | We present in this paper three dynamic clustering techniques for
Object-Oriented Databases (OODBs). The first two, Dynamic, Statistical &
Tunable Clustering (DSTC) and StatClust, exploit both comprehensive usage
statistics and the inter-object reference graph. They are quite elaborate.
However, they are also complex to implement and induce a high overhead. The
third clustering technique, called Detection & Reclustering of Objects (DRO),
is based on the same principles, but is much simpler to implement. These three
clustering algorithm have been implemented in the Texas persistent object store
and compared in terms of clustering efficiency (i.e., overall performance
increase) and overhead using the Object Clustering Benchmark (OCB). The results
obtained showed that DRO induced a lighter overhead while still achieving
better overall performance.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 12:50:39 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Darmont",
"Jérôme",
"",
"LIMOS"
],
[
"Fromantin",
"Christophe",
"",
"LIMOS"
],
[
"Régnier",
"Stéphane",
"",
"LIMOS"
],
[
"Gruenwald",
"Le",
"",
"LIMOS"
],
[
"Schneider",
"Michel",
"",
"LIMOS"
]
] |
0705.0282 | Pasquini Barbara | B. Pasquini (Pavia U. & INFN, Pavia), D. Drechsel (Mainz U., Inst.
Kernphys.), and M. Vanderhaeghen (Jefferson Lab & William-Mary Coll.) | Proton spin polarizabilities from polarized Compton scattering | 26 pages, 7 figures; | Phys.Rev.C76:015203,2007 | 10.1103/PhysRevC.76.015203 | WM-07-103 | hep-ph | null | Polarized Compton scattering off the proton is studied within the framework
of subtracted dispersion relations for photon energies up to 300 MeV. As a
guideline for forthcoming experiments, we focus the attention on the role of
the proton's spin polarizabilities and investigate the most favorable
conditions to extract them with a minimum of model dependence. We conclude that
a complete separation of the four spin polarizabilities is possible, at photon
energies between threshold and the $\Delta(1232)$ region, provided one can
achieve polarization measurements with an accuracy of a few percent.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 13:01:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pasquini",
"B.",
"",
"Pavia U. & INFN, Pavia"
],
[
"Drechsel",
"D.",
"",
"Mainz U., Inst.\n Kernphys."
],
[
"Vanderhaeghen",
"M.",
"",
"Jefferson Lab & William-Mary Coll."
]
] |
0705.0283 | Benoit Blossier | Benoit Blossier | Lattice renormalisation of O(a) improved heavy-light operators | 16 pages, 2 figures, 4 tables; few comments and references added;
version to be published in Phys Rev D | Phys.Rev.D76:114513,2007 | 10.1103/PhysRevD.76.114513 | null | hep-lat | null | The analytical expressions and the numerical values of the renormalisation
constants of ${\cal O}(a)$ improved static-light currents are given at one-loop
order of perturbation theory in the framework of Heavy Quark Effective Theory:
the static quark is described by the HYP action and the light quark is
described either with the Clover or the Neuberger action. These factors are
relevant to extract from a lattice computation the decay constants $f_B$,
$f_{B_S}$ and the set of bag parameters $B_i$ associated with $B-\bar{B}$
mixing phenomenology in the Standard Model and beyond.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 13:05:32 GMT"
},
{
"version": "v2",
"created": "Thu, 25 Oct 2007 10:41:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Blossier",
"Benoit",
""
]
] |
0705.0284 | Claudio Dappiaggi | C. Dappiaggi (Pavia U.) | Projecting Massive Scalar Fields to Null Infinity | 26 pages | Ann. Henri Poincare 9 (2008), 35-63 | 10.1007/s00023-007-0349-1 | null | gr-qc hep-th math-ph math.MP | null | It is known that, in an asymptotically flat spacetime, null infinity cannot
act as an initial-value surface for massive real scalar fields. Exploiting
tools proper of harmonic analysis on hyperboloids and global norm estimates for
the wave operator, we show that it is possible to circumvent such obstruction
at least in Minkowski spacetime. Hence we project norm-finite solutions of the
Klein-Gordon equation of motion in data on null infinity and, eventually, we
interpret them in terms of boundary free field theory.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 13:11:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dappiaggi",
"C.",
"",
"Pavia U."
]
] |
0705.0285 | Ilya Mandel | Ilya Mandel, Duncan A. Brown, Jonathan R. Gair, M. Coleman Miller | Rates and Characteristics of Intermediate Mass Ratio Inspirals
Detectable by Advanced LIGO | Accepted for publication in ApJ; revised version reflects changes
made to the article during the acceptance process | Astrophys.J.681:1431-1447,2008 | 10.1086/588246 | null | astro-ph gr-qc | null | Gravitational waves (GWs) from the inspiral of a neutron star (NS) or
stellar-mass black hole (BH) into an intermediate-mass black hole (IMBH) with
mass between ~50 and ~350 solar masses may be detectable by the planned
advanced generation of ground-based GW interferometers. Such intermediate mass
ratio inspirals (IMRIs) are most likely to be found in globular clusters. We
analyze four possible IMRI formation mechanisms: (1) hardening of an NS-IMBH or
BH-IMBH binary via three-body interactions, (2) hardening via Kozai resonance
in a hierarchical triple system, (3) direct capture, and (4) inspiral of a
compact object from a tidally captured main-sequence star; we also discuss
tidal effects when the inspiraling object is an NS. For each mechanism we
predict the typical eccentricities of the resulting IMRIs. We find that IMRIs
will have largely circularized by the time they enter the sensitivity band of
ground-based detectors. Hardening of a binary via three-body interactions,
which is likely to be the dominant mechanism for IMRI formation, yields
eccentricities under 10^-4 when the GW frequency reaches 10 Hz. Even among
IMRIs formed via direct captures, which can have the highest eccentricities,
around 90% will circularize to eccentricities under 0.1 before the GW frequency
reaches 10 Hz. We estimate the rate of IMRI coalescences in globular clusters
and the sensitivity of a network of three Advanced LIGO detectors to the
resulting GWs. We show that this detector network may see up to tens of IMRIs
per year, although rates of one to a few per year may be more plausible. We
also estimate the loss in signal-to-noise ratio that will result from using
circular IMRI templates for data analysis and find that, for the eccentricities
we expect, this loss is negligible.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 13:16:07 GMT"
},
{
"version": "v2",
"created": "Tue, 13 May 2008 20:43:07 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Mandel",
"Ilya",
""
],
[
"Brown",
"Duncan A.",
""
],
[
"Gair",
"Jonathan R.",
""
],
[
"Miller",
"M. Coleman",
""
]
] |
0705.0286 | Hajime Matsui | Hajime Matsui, Seiichi Mita | Inverse-free Berlekamp-Massey-Sakata Algorithm and Small Decoders for
Algebraic-Geometric Codes | 15 pages, submitted to IEEE Transactions on Information Theory | null | null | null | cs.IT math.IT | null | This paper proposes a novel algorithm for finding error-locators of
algebraic-geometric codes that can eliminate the division-calculations of
finite fields from the Berlekamp-Massey-Sakata algorithm. This inverse-free
algorithm provides full performance in correcting a certain class of errors,
generic errors, which includes most errors, and can decode codes on algebraic
curves without the determination of unknown syndromes. Moreover, we propose
three different kinds of architectures that our algorithm can be applied to,
and we represent the control operation of shift-registers and switches at each
clock-timing with numerical simulations. We estimate the performance in
comparison of the total running time and the numbers of multipliers and
shift-registers in three architectures with those of the conventional ones for
codes on algebraic curves.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 13:13:48 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Matsui",
"Hajime",
""
],
[
"Mita",
"Seiichi",
""
]
] |
0705.0287 | Michael A. Dopita | Michael Dopita, John Hart, Peter McGregor, Patrick Oates, Gabe Bloxham
and Damien Jones | The Wide Field Spectrograph (WiFeS) | Accepted for publication in Astrophysics & Space Science, 16 pages,
14 figures | Astrophys.Space Sci.310:255-268,2007 | 10.1007/s10509-007-9510-z | null | astro-ph | null | This paper describes the Wide Field Spectrograph (WiFeS) under construction
at the Research School of Astronomy and Astrophysics (RSAA) of the Australian
National University (ANU) for the ANU 2.3m telescope at the Siding Spring
Observatory. WiFeS is a powerful integral field, double-beam, concentric,
image-slicing spectrograph designed to deliver excellent thoughput, wavelength
stability, spectrophotometric performance and superb image quality along with
wide spectral coverage throughout the 320-950 nm wavelength region. It provides
a 25x38 arcsec. field with 0.5 arcsec. sampling along each of twenty five 38X1
arcsec slitlets. The output format is optimized to match the 4096x4096 pixel
CCD detectors in each of two cameras individually optimized for the blue and
the red ends of the spectrum, respectively. A process of "interleaved
nod-and-shuffle" will be applied to permit quantum noise-limited sky
subtraction. Using VPH gratings, spectral resolutions of 3000 and 7000 are
provided. The full spectral range is covered in a single exposure at R=3000,
and in two exposures in the R=7000 mode. The use of transmissive coated optics,
VPH gratings and optimized mirror coatings ensures a throughput (including
telescope atmosphere and detector) > 30% over a wide spectral range. The
concentric image-slicer design ensures an excellent and uniform image quality
across the full field. To maximize scientific return, the whole instrument is
configured for remote observing, pipeline data reduction, and the accumulation
of calibration image libraries.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 13:47:18 GMT"
}
] | 2019-08-19T00:00:00 | [
[
"Dopita",
"Michael",
""
],
[
"Hart",
"John",
""
],
[
"McGregor",
"Peter",
""
],
[
"Oates",
"Patrick",
""
],
[
"Bloxham",
"Gabe",
""
],
[
"Jones",
"Damien",
""
]
] |
0705.0288 | Frederic Nataf | Caroline Japhet (LAGA), Yvon Maday (LJLL), Fr\'ed\'eric Nataf (LJLL) | A new Cement to Glue non-conforming Grids with Robin interface
conditions: the finite element case | null | null | null | null | math.NA | null | We design and analyze a new non-conforming domain decomposition method based
on Schwarz type approaches that allows for the use of Robin interface
conditions on non-conforming grids. The method is proven to be well posed, and
the iterative solver to converge. The error analysis is performed in 2D
piecewise polynomials of low and high order and extended in 3D for $P_1$
elements. Numerical results in 2D illustrate the new method.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 13:19:20 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Japhet",
"Caroline",
"",
"LAGA"
],
[
"Maday",
"Yvon",
"",
"LJLL"
],
[
"Nataf",
"Frédéric",
"",
"LJLL"
]
] |
0705.0289 | Laura Adams | L. L. A. Adams, B. W. Lang, Yu Chen and A. M. Goldman | Signatures of Random Matrix Theory in the Discrete Energy Spectra of
Subnanosize Metallic Clusters | 10 pages, 9 figures, to appear in Phys. Rev. B | null | 10.1103/PhysRevB.75.205107 | null | cond-mat.mes-hall | null | Lead clusters deposited on Si(111) substrates have been studied at low
temperatures using scanning tunneling microscopy and spectroscopy. The
current-voltage characteristics exhibit current peaks that are irregularly
spaced and varied in height. The statistics of the distribution of peak heights
and spacings are in agreement with random matrix theory for several clusters.
The distributions have also been studied as a function of cluster shape.
| [
{
"version": "v1",
"created": "Tue, 1 May 2007 23:51:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Adams",
"L. L. A.",
""
],
[
"Lang",
"B. W.",
""
],
[
"Chen",
"Yu",
""
],
[
"Goldman",
"A. M.",
""
]
] |
0705.0290 | Ofelia Pisanti | O. Pisanti, A. Cirillo, S. Esposito, F. Iocco, G. Mangano, G. Miele,
and P.D. Serpico | PArthENoPE: Public Algorithm Evaluating the Nucleosynthesis of
Primordial Elements | 18 pages, 2 figures. Version accepted by Comp. Phys. Com. The code
(and an updated manual) is publicly available at
http://parthenope.na.infn.it/ | Comp.Phys.Commun.178:956-971,2008 | 10.1016/j.cpc.2008.02.015 | DSF 13/07, FERMILAB-PUB-07-079-A, SLAC-PUB-12488 | astro-ph hep-ph | null | We describe a program for computing the abundances of light elements produced
during Big Bang Nucleosynthesis which is publicly available at
http://parthenope.na.infn.it/. Starting from nuclear statistical equilibrium
conditions the program solves the set of coupled ordinary differential
equations, follows the departure from chemical equilibrium of nuclear species,
and determines their asymptotic abundances as function of several input
cosmological parameters as the baryon density, the number of effective
neutrino, the value of cosmological constant and the neutrino chemical
potential. The program requires commercial NAG library routines.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:52:12 GMT"
},
{
"version": "v2",
"created": "Fri, 30 May 2008 14:11:14 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Pisanti",
"O.",
""
],
[
"Cirillo",
"A.",
""
],
[
"Esposito",
"S.",
""
],
[
"Iocco",
"F.",
""
],
[
"Mangano",
"G.",
""
],
[
"Miele",
"G.",
""
],
[
"Serpico",
"P. D.",
""
]
] |
0705.0291 | Dirk Frettl\"oh | N. Dolbilin, D. Frettl\"oh | Properties of B\"or\"oczki tilings in high dimensional hyperbolic spaces | 17 pages, 3 Figures, corrected several typos, revised proofs | null | null | null | math.MG | null | We consider families of B\"or\"oczky tilings in hyperbolic space in arbitrary
dimension, study some basic properties and classify all possible symmetries. In
particular, it is shown that these tilings are non-crystallographic, and that
there are uncountably many tilings with a fixed prototile.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 13:49:16 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Mar 2008 14:15:33 GMT"
}
] | 2008-03-14T00:00:00 | [
[
"Dolbilin",
"N.",
""
],
[
"Frettlöh",
"D.",
""
]
] |
0705.0292 | Norbert Schuch | Norbert Schuch, Michael M. Wolf, Frank Verstraete, J. Ignacio Cirac | Entropy scaling and simulability by Matrix Product States | 4 pages, 1 figure. v2: Accepted version, minor changes and
clarifications, Journal-Ref. added | Phys. Rev. Lett. 100, 030504 (2008) | 10.1103/PhysRevLett.100.030504 | null | quant-ph cond-mat.str-el | null | We investigate the relation between the scaling of block entropies and the
efficient simulability by Matrix Product States (MPS), and clarify the
connection both for von Neumann and Renyi entropies (see Table I). Most
notably, even states obeying a strict area law for the von Neumann entropy are
not necessarily approximable by MPS. We apply these results to illustrate that
quantum computers might outperform classical computers in simulating the time
evolution of quantum systems, even for completely translational invariant
systems subject to a time independent Hamiltonian.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:48:23 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2008 16:13:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schuch",
"Norbert",
""
],
[
"Wolf",
"Michael M.",
""
],
[
"Verstraete",
"Frank",
""
],
[
"Cirac",
"J. Ignacio",
""
]
] |
0705.0293 | Gerard van der Geer | Jonas Bergstr\"om and Gerard van der Geer | The Euler characteristic of local systems on the moduli of curves and
abelian varieties of genus three | null | null | 10.1112/jtopol/jtn015 | Mittag-Leffler Report No 11, 2006/7 | math.AG math.NT | null | We show how to calculate the Euler characteristic of a local system
associated to an irreducible representation of the symplectic group of genus 3
on the moduli space of curves of genus 3 and the moduli space of principally
polarized abelian varieties of dimension 3.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:22:13 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Bergström",
"Jonas",
""
],
[
"van der Geer",
"Gerard",
""
]
] |
0705.0294 | Stuart Raby | Stuart Raby and Akin Wingerter | Gauge coupling unification and light Exotica in String Theory | 5 pages, no figures | Phys.Rev.Lett.99:051802,2007 | 10.1103/PhysRevLett.99.051802 | OHSTPY-HEP-T-07-001 | hep-ph | null | In this letter we consider the consequences for the LHC of light vector-like
exotica with fractional electric charge. It is shown that such states are found
in orbifold constructions of the heterotic string. Moreover, these exotica are
consistent with gauge coupling unification at one loop, even though they do not
come in complete multiplets of SU(5).
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:12:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Raby",
"Stuart",
""
],
[
"Wingerter",
"Akin",
""
]
] |
0705.0295 | Gianluca Geloni | Gianluca Geloni, Evgeni Saldin, Evgeni Schneidmiller and Mikhail
Yurkov | Theory of Nonlinear Harmonic Generation in Free-Electron Lasers with
Helical Wigglers | 23 pages, 4 figures | Nucl.Instrum.Meth.A581:856-865,2007 | 10.1016/j.nima.2007.08.152 | DESY 07-058 | physics.optics physics.acc-ph | null | Coherent Harmonic Generation (CHG), and in particular Nonlinear Harmonic
Generation (NHG), is of importance for both short wavelength Free-Electron
Lasers (FELs), in relation with the achievement of shorter wavelengths with a
fixed electron-beam energy, and high-average power FEL resonators, in relation
with destructive effects of higher harmonics radiation on mirrors. In this
paper we present a treatment of NHG from helical wigglers with particular
emphasis on the second harmonic. Our study is based on an exact analytical
solution of Maxwell's equations, derived with the help of a Green's function
method. In particular, we demonstrate that nonlinear harmonic generation (NHG)
from helical wigglers vanishes on axis. Our conclusion is in open contrast with
results in literature, that include a kinematical mistake in the description of
the electron motion.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:16:24 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Geloni",
"Gianluca",
""
],
[
"Saldin",
"Evgeni",
""
],
[
"Schneidmiller",
"Evgeni",
""
],
[
"Yurkov",
"Mikhail",
""
]
] |
0705.0296 | Alexei Yu. Karlovich | Alexei Yu. Karlovich | Higher Order Asymptotic Formulas for Traces of Toeplitz Matrices with
Symbols in H\"older-Zygmund Spaces | 10 pages | null | null | null | math.FA math.CA | null | We prove a higher order asymptotic formula for traces of finite block
Toeplitz matrices with symbols belonging to H\"older-Zygmund spaces. The
remainder in this formula goes to zero very rapidly for very smooth symbols.
This formula refine previous asymptotic trace formulas by Szeg\"o and Widom and
complement higher order asymptotic formulas for determinants of finite block
Toeplitz matrices due to B\"ottcher and Silbermann.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:27:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Karlovich",
"Alexei Yu.",
""
]
] |
0705.0297 | Grzegorz Swiatek | Genadi Levin, Grzegorz Swiatek | Measure of the Julia Set of the Feigenbaum map with infinite criticality | null | null | null | null | math.GN math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider fixed points of the Feigenbaum (periodic-doubling) operator whose
orders tend to infinity. It is known that the hyperbolic dimension of their
Julia sets go to 2. We prove that the Lebesgue measure of these Julia sets tend
to zero. An important part of the proof consists in applying martingale theory
to a stochastic process with non-integrable increments.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:28:40 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Mar 2009 13:45:08 GMT"
}
] | 2009-03-25T00:00:00 | [
[
"Levin",
"Genadi",
""
],
[
"Swiatek",
"Grzegorz",
""
]
] |
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