id
stringlengths 9
16
| submitter
stringlengths 1
64
⌀ | authors
stringlengths 3
36.7k
| title
stringlengths 1
382
| comments
stringlengths 1
1.15k
⌀ | journal-ref
stringlengths 1
557
⌀ | doi
stringlengths 7
153
⌀ | report-no
stringlengths 1
479
⌀ | categories
stringlengths 5
125
| license
stringclasses 9
values | abstract
stringlengths 6
6.09k
| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.2014 | Alfred de Wijn | A. G. de Wijn, B. De Pontieu, R. J. Rutten | Fourier analysis of active-region plage | 14 pages, 6 figures | Astrophys.J.654:1128-1134,2007 | 10.1086/509253 | null | astro-ph | null | We study the dynamical interaction of the solar chromosphere with the
transition region in mossy and non-mossy active-region plage. We carefully
align image sequences taken with the Transition Region And Coronal Explorer
(TRACE) in the ultraviolet passbands around 1550, 1600, and 1700 A and the
extreme ultraviolet passbands at 171 and 195 A. We compute Fourier
phase-difference spectra that are spatially averaged separately over mossy and
non-mossy plage to study temporal modulations as a function of temporal
frequency. The 1550 versus 171 A comparison shows zero phase difference in
non-mossy plage. In mossy plage, the phase differences between all UV and EUV
passbands show pronounced upward trends with increasing frequency, which
abruptly changes into zero phase difference beyond 4-6 mHz. The phase
difference between the 171 and 195 A sequences exhibits a shallow dip below 3
mHz and then also turns to zero phase difference beyond this value. We
attribute the various similarities between the UV and EUV diagnostics that are
evident in the phase-difference diagrams to the contribution of the C IV
resonance lines in the 1550 and 1600 A passbands. The strong upward trend at
the lower frequencies indicates the presence of upward-traveling disturbances.
It points to correspondence between the lower chromosphere and the upper
transition region, perhaps by slow-mode magnetosonic disturbances, or by a
connection between chromospheric and coronal heating mechanisms. The transition
from this upward trend to zero phase difference at higher frequencies is due to
the intermittent obscuration by fibrils that occult the foot points of hot
loops, which are bright in the EUV and C IV lines, in oscillatory manner.
| [
{
"version": "v1",
"created": "Wed, 13 Jun 2007 23:59:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"de Wijn",
"A. G.",
""
],
[
"De Pontieu",
"B.",
""
],
[
"Rutten",
"R. J.",
""
]
] |
0706.2015 | Evgeny Buchbinder | Evgeny I. Buchbinder | Infrared Limit of Gluon Amplitudes at Strong Coupling | 10 pages, 2 figures; minor corrections, references added; typos
corrected | Phys.Lett.B654:46-50,2007 | 10.1016/j.physletb.2007.08.028 | null | hep-th | null | In this note, we propose that the infrared structure of gluon amplitudes at
strong coupling can be fully extracted from a local consideration near cusps.
This is consistent with field theory and correctly reproduces the infrared
divergences of the four-gluon amplitude at strong coupling calculated recently
by Alday and Maldacena.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 00:24:04 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Jul 2007 05:20:10 GMT"
},
{
"version": "v3",
"created": "Fri, 27 Jul 2007 06:39:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Buchbinder",
"Evgeny I.",
""
]
] |
0706.2016 | Geumsook Park | Geumsook Park and Minho Choi | Observations of Water Masers in the NGC 1333 IRAS 4 Region | 8 pages, 5 figures | null | 10.1086/520810 | null | astro-ph | null | The NGC 1333 IRAS 4 region was observed in the 22 GHz H2O maser line with an
angular resolution of about 0.08 arcseconds. Two groups of masers were
detected, one near IRAS 4A and the other near BI. Among the eight maser spots
detected near IRAS 4A, six spots are located close to A2, within 100 AU, and
the maser velocities are also near the systemic velocity of the cloud core.
These masers are probably related with the circumstellar disk. Since there is
no maser spot detected around A1, the star forming process is relatively more
active in A2 than in A1. Four maser spots were detected near IRAS 4BI. Since
most of them are distributed along a straight line in the direction of the
outflow, BI masers are most likely related with the jet or outflow. The
disk-outflow dichotomy of H2O masers is discussed briefly. No maser was
detected near H2O(C), another maser source reported previously.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 00:35:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Park",
"Geumsook",
""
],
[
"Choi",
"Minho",
""
]
] |
0706.2017 | Vu Huynh | Vu Q. Huynh and Thang T. Q. Le | Twisted Alexander polynomial of links in the projective space | To appear on Journal of Knot Theory and Its Ramifications | null | null | null | math.GT | null | We use Reidemeister torsion to study a twisted Alexander polynomial, as
defined by Turaev, for links in the projective space. Using sign-refined
torsion we derive a skein relation for a normalized form of this polynomial.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 00:48:33 GMT"
}
] | 2009-04-16T00:00:00 | [
[
"Huynh",
"Vu Q.",
""
],
[
"Le",
"Thang T. Q.",
""
]
] |
0706.2018 | Bo-Qiang Ma | Jianghao Yu, Bo-Wen Xiao, Bo-Qiang Ma | Space-like and time-like pion-rho transition form factors in the
light-cone formalism | 17 latex pages, 5 figures, final version for publication | J.Phys.G34:1845-1860,2007 | 10.1088/0954-3899/34/7/021 | null | hep-ph | null | Having calculated the light-cone wave function of the pseudoscalar meson by
using two equivalent and fully covariant methods, we generalize such methods to
the valence Fock states of the vector meson in the light-cone formalism. We
investigate the decay constant of the $\rho$ meson $f_{\rho}$, the
$\gamma^{\ast} \pi \to \rho $ and $\gamma^* \rho \to \pi $ transition form
factors and especially the transition magnetic moments. By using two groups of
constraint parameters, we predict the space-like and time-like form factors
$F_{\pi \rho}(Q^2)$ and $F_{\rho \pi}(Q^2)$ at low and moderate energy scale
and the electromagnetic radius of these transition processes. In addition, we
extend our calculation to $\gamma^* \pi \to \omega$ space-like and time-like
form factors by using the same sets of parameters.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 00:59:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yu",
"Jianghao",
""
],
[
"Xiao",
"Bo-Wen",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] |
0706.2019 | Sergio Boixo | Sergio Boixo and Alex Monras | An operational interpretation for multipartite entanglement | 4 pages, 1 figure | Phys. Rev. Lett. 100, 100503 (2008) | 10.1103/PhysRevLett.100.100503 | null | quant-ph | null | We introduce an operational interpretation for pure-state global multipartite
entanglement based on quantum estimation. We show that the estimation of the
strength of low-noise locally depolarizing channels, as quantified by the
regularized quantum Fisher information, is directly related to the
Meyer-Wallach multipartite entanglement measure. Using channels that depolarize
across different partitions, we obtain related multipartite entanglement
measures. We show that this measure is the sum of expectation values of local
observables on two copies of the state.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 01:06:46 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Mar 2008 17:16:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Boixo",
"Sergio",
""
],
[
"Monras",
"Alex",
""
]
] |
0706.2020 | Peter Forrester | Peter J. Forrester and Taro Nagao | Eigenvalue statistics of the real Ginibre ensemble | 4 pages, to appear PRL | Phys. Rev. Lett., 99, 050603 (2007) | 10.1103/PhysRevLett.99.050603 | null | cond-mat.stat-mech | null | The real Ginibre ensemble consists of random $N \times N$ matrices formed
from i.i.d. standard Gaussian entries. By using the method of skew orthogonal
polynomials, the general $n$-point correlations for the real eigenvalues, and
for the complex eigenvalues, are given as $n \times n$ Pfaffians with explicit
entries. A computationally tractable formula for the cumulative probability
density of the largest real eigenvalue is presented. This is relevant to May's
stability analysis of biological webs.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 01:30:40 GMT"
}
] | 2015-06-16T00:00:00 | [
[
"Forrester",
"Peter J.",
""
],
[
"Nagao",
"Taro",
""
]
] |
0706.2021 | Peter Moeck | Peter Moeck and Philip Fraundorf | Structural fingerprinting in the transmission electron microscope:
Overview and opportunities to implement enhanced strategies for nanocrystal
identification | 24 pages, 113 references, 7 footnotes (with some more references), 1
figure | null | null | null | cond-mat.mtrl-sci | null | This paper illustrates the prospective need for structural fingerprinting
methods for nanocrystals. A review of the existing fingerprinting methods for
crystal structures by means of transmission electron microscopy which work for
a single setting of the specimen goniometer is given. Suggestions are made on
how some of these methods could be enhanced when nanocrystals and novel
instrumentation are involved, i.e. when either the kinematic or quasi-kinematic
scattering approximations are sufficiently well satisfied. A novel strategy for
lattice-fringe fingerprinting of nanocrystals from Fourier transforms of
high-resolution phase contrast transmission electron microscopy images is
briefly outlined. Nanocrystal structure specific limitations to the application
of this strategy are discussed. An appeal is made to share the structural data
of nanocrystals freely over the internet and infrastructure that would allow
this sharing is mentioned. A shorter version of this paper has been accepted
for publication in a special issue on the Structure of Nanocrystals of the
Zeitschrift fuer Kristallographie, International journal for structural,
physical, and chemical aspects of crystalline materials.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 01:33:22 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Moeck",
"Peter",
""
],
[
"Fraundorf",
"Philip",
""
]
] |
0706.2022 | Laura Langland-Shula | Laura E. Langland-Shula and Graeme H. Smith | The Unusual Spectrum of Comet 96P/Machholz | 14 pages, 4 tables, 2 figures, accepted for publication in ApJL | null | 10.1086/520839 | null | astro-ph | null | We report spectra from 3000-5900 A for comet 96P/Machholz, obtained on 2007
Apr 27 UT with the 3-m Shane telescope at Lick Observatory. The spectra are
extremely carbon poor, and show a prominent NH_2 series, but no CN emission.
NH, NH_2, and C_2 gas production rates are (8.36 +/- 2.18)x10^25, (29.88 +/-
3.66)x10^25, and (4.52 +/- 0.61)x10^23 molecules sec^-1, respectively, as
determined from Haser model fits to the data. Upper limits to the gas
production rates for CN and C_3 are 7.5x10^22 and 2.0x10^23, respectively.
Though 96P is depleted in C_2 and C_3 relative to NH, it is even more depleted
in CN than other so-called "carbon-chain depleted" comets.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 18:54:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Langland-Shula",
"Laura E.",
""
],
[
"Smith",
"Graeme H.",
""
]
] |
0706.2023 | Konstantin Tsigutkin | K. Tsigutkin, R. Doron, E. Stambulchik, V. Bernshtam, Y. Maron | Electric fields in plasmas under pulsed currents | 13 pages, 13 figures, submitted to PRE | null | 10.1103/PhysRevE.76.046401 | null | physics.plasm-ph | null | Electric fields in a plasma that conducts a high-current pulse are measured
as a function of time and space. The experiment is performed using a coaxial
configuration, in which a current rising to 160 kA in 100 ns is conducted
through a plasma that prefills the region between two coaxial electrodes. The
electric field is determined using laser spectroscopy and line-shape analysis.
Plasma doping allows for 3D spatially resolved measurements. The measured peak
magnitude and propagation velocity of the electric field is found to match
those of the Hall electric field, inferred from the magnetic-field front
propagation measured previously.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 01:46:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tsigutkin",
"K.",
""
],
[
"Doron",
"R.",
""
],
[
"Stambulchik",
"E.",
""
],
[
"Bernshtam",
"V.",
""
],
[
"Maron",
"Y.",
""
]
] |
0706.2024 | Eben Kenah | Eben Kenah, Marc Lipsitch, James M. Robins | Generation interval contraction and epidemic data analysis | 20 pages, 5 figures; to appear in Mathematical Biosciences | Mathematical Biosciences 213(1): 71-79, May 2008 | 10.1016/j.mbs.2008.02.007 | null | q-bio.QM math.PR stat.AP | null | The generation interval is the time between the infection time of an infected
person and the infection time of his or her infector. Probability density
functions for generation intervals have been an important input for epidemic
models and epidemic data analysis. In this paper, we specify a general
stochastic SIR epidemic model and prove that the mean generation interval
decreases when susceptible persons are at risk of infectious contact from
multiple sources. The intuition behind this is that when a susceptible person
has multiple potential infectors, there is a ``race'' to infect him or her in
which only the first infectious contact leads to infection. In an epidemic, the
mean generation interval contracts as the prevalence of infection increases. We
call this global competition among potential infectors. When there is rapid
transmission within clusters of contacts, generation interval contraction can
be caused by a high local prevalence of infection even when the global
prevalence is low. We call this local competition among potential infectors.
Using simulations, we illustrate both types of competition.
Finally, we show that hazards of infectious contact can be used instead of
generation intervals to estimate the time course of the effective reproductive
number in an epidemic. This approach leads naturally to partial likelihoods for
epidemic data that are very similar to those that arise in survival analysis,
opening a promising avenue of methodological research in infectious disease
epidemiology.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 02:00:03 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Dec 2007 02:02:05 GMT"
},
{
"version": "v3",
"created": "Thu, 21 Feb 2008 00:44:47 GMT"
}
] | 2023-10-24T00:00:00 | [
[
"Kenah",
"Eben",
""
],
[
"Lipsitch",
"Marc",
""
],
[
"Robins",
"James M.",
""
]
] |
0706.2025 | Sapon Tanachaiwiwat | Sapon Tanachaiwiwat, Ahmed Helmy | On the Performance Evaluation of Encounter-based Worm Interactions Based
on Node Characteristics | null | null | null | null | cs.CR cs.NI | null | An encounter-based network is a frequently disconnected wireless ad-hoc
network requiring nearby neighbors to store and forward data utilizing mobility
and encounters over time. Using traditional approaches such as gateways or
firewalls for deterring worm propagation in encounter-based networks is
inappropriate. Because this type of network is highly dynamic and has no
specific boundary, a distributed counter-worm mechanism is needed. We propose
models for the worm interaction approach that relies upon automated beneficial
worm generation to alleviate problems of worm propagation in such networks. We
study and analyze the impact of key mobile node characteristics including node
cooperation, immunization, on-off behavior on the worm propagations and
interactions. We validate our proposed model using extensive simulations. We
also find that, in addition to immunization, cooperation can reduce the level
of worm infection. Furthermore, on-off behavior linearly impacts only timing
aspect but not the overall infection. Using realistic mobile network
measurements, we find that encounters are non-uniform, the trends are
consistent with the model but the magnitudes are drastically different.
Immunization seems to be the most effective in such scenarios. These findings
provide insight that we hope would aid to develop counter-worm protocols in
future encounter-based networks.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 02:23:01 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Tanachaiwiwat",
"Sapon",
""
],
[
"Helmy",
"Ahmed",
""
]
] |
0706.2026 | Hua Bai | Hua Bai | Quantum Teichm\"uller spaces and Kashaev's 6j-symbols | 18 pages, 2 figures | null | null | null | math.GT math.QA | null | The Kashaev invariants of 3-manifolds are based on $6j$-symbols from the
representation theory of the Weyl algebra, a Hopf algebra corresponding to the
Borel subalgebra of $U_q(sl(2,\C))$. In this paper, we show that Kashaev's
$6j$-symbols are intertwining operators of local representations of quantum
Teichm\"uller spaces. This relates Kashaev's work with the theory of quantum
Teichm\"uller space, which was developed by Chekhov-Fock, Kashaev and continued
by Bonahon-Liu.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 02:31:43 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Bai",
"Hua",
""
]
] |
0706.2027 | Xiang Cheng | Xiang Cheng, German Varas, Daniel Citron, Heinrich M. Jaeger and
Sidney R. Nagel | Collective behavior in a granular jet: Emergence of a liquid with zero
surface-tension | 5 pages, 4 figures | null | 10.1103/PhysRevLett.99.188001 | null | cond-mat.soft | null | We perform the analog to the "water bell" experiment using non-cohesive
granular material. When a jet of granular material, many particles wide,
rebounds from a fixed cylindrical target, it deforms into a sharply-defined
sheet or cone with a shape that mimics a liquid with zero surface tension. The
particulate nature of granular material becomes apparent when the number of
particles in the cross-section of the jet is decreased and the emerging sheets
and cones broaden and gradually disintegrate into a broad spray. This
experiment has its counterpart in the behavior of the quark-gluon plasma
generated by collisions of gold ions at the Relativistic Heavy Ion Collider.
There a high density of inter-particle collisions gives rise to collective
behavior that has also been described as a liquid.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 03:10:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cheng",
"Xiang",
""
],
[
"Varas",
"German",
""
],
[
"Citron",
"Daniel",
""
],
[
"Jaeger",
"Heinrich M.",
""
],
[
"Nagel",
"Sidney R.",
""
]
] |
0706.2028 | Li Ma | Li Ma and Anqiang Zhu | Eigenvalues and lambda constants on Riemannian submersions | 9 pages | null | null | null | math.DG math.AP | null | Given a Riemannian submersion, we study the relation between lambda constants
introduced by G.Perelman on the base manifold and the total space of a
Riemannian submersion. We also discuss the relationship between the first
eigenvalues of Laplacians on the base manifold and that of the total space. The
quantities on warped products are discussed in detail.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 03:12:40 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Jun 2007 12:26:47 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Ma",
"Li",
""
],
[
"Zhu",
"Anqiang",
""
]
] |
0706.2029 | Bacham E. Reddy | Thomas Maas (1), Sunetra Giridhar (2), David L. Lambert (1) ((1) The
W.J. McDonald Observatory (2) Indian Institute of Astrophysics) | The Chemical Compositions of the Type II Cepheids -- The BL Her and W
Vir Variables | 41 pages including 11 figures and 4 tables; Accepted for publication
in ApJ | Astrophys.J.666:378-392,2007 | 10.1086/520081 | null | astro-ph | null | Abundance analyses from high-resolution optical spectra are presented for 19
Type II Cepheids in the Galactic field. The sample includes both short-period
(BL Her) and long-period (W Vir) stars. This is the first extensive abundance
analysis of these variables. The C, N, and O abundances with similar spreads
for the BL Her and W Vir show evidence for an atmosphere contaminated with
$3\alpha$-process and CN-cycling products. A notable anomaly of the BL Her
stars is an overabundance of Na by a factor of about five relative to their
presumed initial abundances. This overabundance is not seen in the W Vir stars.
The abundance anomalies running from mild to extreme in W Vir stars but not
seen in the BL Her stars are attributed to dust-gas separation that provides an
atmosphere deficient in elements of high condensation temperature, notably Al,
Ca, Sc, Ti, and $s$-process elements. Such anomalies have previously been seen
among RV Tau stars which represent a long-period extension of the variability
enjoyed by the Type II Cepheids. Comments are offered on how the contrasting
abundance anomalies of BL Her and W Vir stars may be explained in terms of the
stars' evolution from the blue horizontal branch.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 03:21:20 GMT"
}
] | 2011-02-11T00:00:00 | [
[
"Maas",
"Thomas",
""
],
[
"Giridhar",
"Sunetra",
""
],
[
"Lambert",
"David L.",
""
]
] |
0706.2030 | Andrei Gritsan | A. V. Gritsan (for the BABAR Collaboration) | Hot Topics from the BABAR Experiment | 14 pages, 33 postscript figures, proceedings of the 5th Flavor
Physics And CP Violation Conference (FPCP 2007) C07/05/12 | ECONF C070512:001,2007 | null | BABAR-TALK-07/041, SLAC-PUB-12569 | hep-ex | null | With a sample of about 384 million BBbar pairs recorded with the BABAR
detector, we search for the flavor-changing charged current transition B+ ->
\tau\nu and perform an amplitude analysis of the effective flavor-changing
neutral current transition B+ -> \phi(1020)K*(892)+. We also extend our search
for other K* final states in the decay B0 -> phi(1020)K*0 with a large K*0 ->
K+pi- invariant mass. Two samples of events with one reconstructed hadronic B
decay or one reconstructed semileptonic B decay are selected, and in the recoil
a search for B+ -> \tau\nu is performed. We find a 2.6 sigma (3.2 sigma not
including expected background uncertainty) excess in data which can be
converted to a preliminary branching fraction central value of BR(B+ -> \tau\nu
) = (1.20 +0.40-0.38 +0.29-0.30 +-0.22) 10^-4. With the decay B+- ->
\phi(1020)K*(892)+-, twelve parameters are measured, where our measurements of
f_L=0.49+-0.05+-0.03, f_perp=0.21+-0.05+-0.02, and the strong phases point to
the presence of a substantial helicity-plus amplitude from a presently unknown
source.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 03:35:07 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Gritsan",
"A. V.",
"",
"for the BABAR Collaboration"
]
] |
0706.2031 | Holger Mueller | Holger Mueller, Paul Louis Stanwix, Michael Edmund Tobar, Eugene
Ivanov, Peter Wolf, Sven Herrmann, Alexander Senger, Evgeny Kovalchuk, and
Achim Peters | Relativity tests by complementary rotating Michelson-Morley experiments | 5 pages revtex, 2 figures | Phys.Rev.Lett.99:050401,2007 | 10.1103/PhysRevLett.99.050401 | null | physics.class-ph gr-qc hep-ph physics.hist-ph | null | We report Relativity tests based on data from two simultaneous
Michelson-Morley experiments, spanning a period of more than one year. Both
were actively rotated on turntables. One (in Berlin, Germany) uses optical
Fabry-Perot resonators made of fused silica; the other (in Perth, Australia)
uses microwave whispering-gallery sapphire resonators. Within the standard
model extension, we obtain simultaneous limits on Lorentz violation for
electrons (5 coefficients) and photons (8) at levels down to $10^{-16}$,
improved by factors between 3 and 50 compared to previous work.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 03:27:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mueller",
"Holger",
""
],
[
"Stanwix",
"Paul Louis",
""
],
[
"Tobar",
"Michael Edmund",
""
],
[
"Ivanov",
"Eugene",
""
],
[
"Wolf",
"Peter",
""
],
[
"Herrmann",
"Sven",
""
],
[
"Senger",
"Alexander",
""
],
[
"Kovalchuk",
"Evgeny",
""
],
[
"Peters",
"Achim",
""
]
] |
0706.2032 | Yi Ni | Yi Ni | Heegaard Floer homology and fibred 3--manifolds | Version 3: 16 pages, 1 figure. This version incorporates the
corrigendum to a previous paper. To appear in American Journal of
Mathematics. Version 2: Corrects some mistakes in Version 1. The last section
of Version 1 is replaced using a quite different and much simpler method.
Exposition improved according to the referee's suggestions | null | null | null | math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a closed 3--manifold $Y$, we show that the Heegaard Floer homology
determines whether $Y$ fibres over the circle with a fibre of negative Euler
characteristic. This is an analogue of an earlier result about knots proved by
Ghiggini and the author.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 03:36:49 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Apr 2008 22:22:31 GMT"
},
{
"version": "v3",
"created": "Mon, 23 Feb 2009 23:32:47 GMT"
}
] | 2009-02-24T00:00:00 | [
[
"Ni",
"Yi",
""
]
] |
0706.2033 | Khoa Nguyen | Khoa D. Nguyen, Albert Guillen i Fabregas and Lars K. Rasmussen | Power Allocation for Discrete-Input Delay-Limited Fading Channels | 61 pages, 10 figures, Submitted to IEEE Trans. Inf. Theory | 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 m times the Singleton bound. We also illustrate the significant gains
available by employing long-term power constraints. In particular, we analyze
the optimal long-term solution, showing that zero outage can be achieved
provided that the corresponding short-term SNR exponent with the same system
parameters is strictly greater than one. Conversely, if the short-term SNR
exponent is smaller than one, we show that zero outage cannot be achieved. In
this case, we derive the corresponding long-term SNR exponent as a function of
the Singleton bound. Due to the nature of the expressions involved, the
complexity of optimal schemes may be prohibitive for system implementation. We
therefore propose simple sub-optimal power allocation schemes whose outage
probability performance is very close to the minimum outage probability
obtained by optimal schemes. We also show the applicability of these techniques
to practical systems employing orthogonal frequency division multiplexing.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 03:48:14 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Nguyen",
"Khoa D.",
""
],
[
"Fabregas",
"Albert Guillen i",
""
],
[
"Rasmussen",
"Lars K.",
""
]
] |
0706.2034 | Li Ma | Li Ma and Juncheng Wei | Properties of positive solutions of an Elliptic Equation with negative
exponents | null | null | null | null | math.AP math.DG | null | In this paper, we study the existence and non-existence result of positive
solutions to a singular elliptic equation with negative power on the bounded
smooth domain or in the whole Euclidean space. Our model arises in the study of
the steady states of thin films and other applied physics. We can get some
useful local gradient estimate and L1 lower bound for positive solutions of the
elliptic equation. A uniform positive lower bound for convex positive solutions
is also obtained. We show that in lower dimensions, there is no stable positive
solutions in the whole space. In the whole space of dimension two, we can show
that there is no positive smooth solution with finite Morse index. Symmetry
properties of related integral equations are also given.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 03:48:32 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Ma",
"Li",
""
],
[
"Wei",
"Juncheng",
""
]
] |
0706.2035 | Michael Silverman | Kyle Sabo, Ryan Schmitt, Michael Silverman | Critique of Feinstein's Proof that P is not Equal to NP | 5 pages, 2 definitions | null | null | null | cs.CC | null | We examine a proof by Craig Alan Feinstein that P is not equal to NP. We
present counterexamples to claims made in his paper and expose a flaw in the
methodology he uses to make his assertions. The fault in his argument is the
incorrect use of reduction. Feinstein makes incorrect assumptions about the
complexity of a problem based on the fact that there is a more complex problem
that can be used to solve it. His paper introduces the terminology "imaginary
processor" to describe how it is possible to beat the brute force reduction he
offers to solve the Subset-Sum problem. The claims made in the paper would not
be validly established even were imaginary processors to exist.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 13:15:39 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Sabo",
"Kyle",
""
],
[
"Schmitt",
"Ryan",
""
],
[
"Silverman",
"Michael",
""
]
] |
0706.2036 | Antoine Heidmann | T. Caniard (LKB - Jussieu), P. Verlot (LKB - Jussieu), T. Briant (LKB
- Jussieu), P. -F. Cohadon (LKB - Jussieu), A. Heidmann (LKB - Jussieu) | Observation of back-action cancellation in interferometric and weak
force measurements | null | Phys.Rev.Lett.99:110801,2007 | 10.1103/PhysRevLett.99.110801 | null | quant-ph gr-qc | null | We experimentally demonstrate a cancellation of back-action noise in optical
measurements. Back-action cancellation was first proposed within the framework
of gravitational-wave detection by dual resonators as a way to drastically
improve their sensitivity. We have developed an experiment based on a
high-finesse Fabry-Perot cavity to study radiation-pressure effects in
ultra-sensitive displacement measurements. Using an intensity-modulated
intracavity field to mimic the quantum radiation-pressure noise, we report the
first observation of back-action cancellation due to a destructive interference
between radiation-pressure effects on both mirrors of the cavity. We have
observed a sensitivity improvement by a factor larger than 20 both in
displacement and weak force measurements.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 04:43:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Caniard",
"T.",
"",
"LKB - Jussieu"
],
[
"Verlot",
"P.",
"",
"LKB - Jussieu"
],
[
"Briant",
"T.",
"",
"LKB\n - Jussieu"
],
[
"Cohadon",
"P. -F.",
"",
"LKB - Jussieu"
],
[
"Heidmann",
"A.",
"",
"LKB - Jussieu"
]
] |
0706.2037 | Hiroshi Koibuchi | Hiroshi Koibuchi | Phase structure of a spherical surface model on fixed connectivity
meshes | 13 pages with 9 figures | Phys. Lett. A 371, 278-284 (2007) | 10.1016/j.physleta.2007.06.023 | ICT-Koi-2007-4 | cond-mat.stat-mech cond-mat.soft | null | An elastic surface model is investigated by using the canonical Monte Carlo
simulation technique on triangulated spherical meshes. The model undergoes a
first-order collapsing transition and a continuous surface fluctuation
transition. The shape of surfaces is maintained by a one-dimensional bending
energy, which is defined on the mesh, and no two-dimensional bending energy is
included in the Hamiltonian.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 05:01:08 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Koibuchi",
"Hiroshi",
""
]
] |
0706.2038 | Satya N. Majumdar | Michael J. Kearney, Satya N. Majumdar, and Richard J. Martin | The first-passage area for drifted Brownian motion and the moments of
the Airy distribution | 13 pages | J. Phys. A: Math. Theor. 40, F863 (2007). | 10.1088/1751-8113/40/36/F03 | null | cond-mat.stat-mech math.CO math.PR | null | An exact expression for the distribution of the area swept out by a drifted
Brownian motion till its first-passage time is derived. A study of the
asymptotic behaviour confirms earlier conjectures and clarifies their range of
validity. The analysis also leads to a simple closed-form solution for the
moments of the Airy distribution.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 05:06:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kearney",
"Michael J.",
""
],
[
"Majumdar",
"Satya N.",
""
],
[
"Martin",
"Richard J.",
""
]
] |
0706.2039 | Gautschy Alfred | A. Gautschy, L.G. Althaus | Oscillatory secular modes: The thermal micropulses | To be published - essentially footnote-free - in Astronomy &
Astrophysics | null | 10.1051/0004-6361:20065739 | null | astro-ph | null | Stars in the narrow mass range of about 2.5 and 3.5 solar masses can develop
a thermally unstable He-burning shell during its ignition phase. We study, from
the point of view secular stability theory, these so called thermal micropulses
and we investigate their properties; the thermal pulses constitute a convenient
conceptual laboratory to look thoroughly into the physical properties of a
helium-burning shell during the whole thermally pulsing episode. Linear
stability analyses were performed on a large number of 3 solar-mass star models
at around the end of their core helium-burning and the beginning of the
double-shell burning phase. The stellar models were not assumed to be in
thermal equilibrium. The thermal mircopulses, and we conjecture all other
thermal pulse episodes encountered by shell-burning stars, can be understood as
the nonlinear finite-amplitude realization of an oscillatory secular
instability that prevails during the whole thermal pulsing episode. Hence, the
cyclic nature of the thermal pulses can be traced back to a linear instability
concept.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 15:09:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gautschy",
"A.",
""
],
[
"Althaus",
"L. G.",
""
]
] |
0706.2040 | Edoardo Airoldi | Edoardo M Airoldi | Getting started in probabilistic graphical models | 12 pages, 1 figure | Airoldi EM (2007) Getting started in probabilistic graphical
models. PLoS Comput Biol 3(12): e252 | 10.1371/journal.pcbi.0030252 | null | q-bio.QM cs.LG physics.soc-ph stat.ME stat.ML | null | Probabilistic graphical models (PGMs) have become a popular tool for
computational analysis of biological data in a variety of domains. But, what
exactly are they and how do they work? How can we use PGMs to discover patterns
that are biologically relevant? And to what extent can PGMs help us formulate
new hypotheses that are testable at the bench? This note sketches out some
answers and illustrates the main ideas behind the statistical approach to
biological pattern discovery.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 14:52:06 GMT"
},
{
"version": "v2",
"created": "Sat, 10 Nov 2007 19:25:59 GMT"
}
] | 2010-02-22T00:00:00 | [
[
"Airoldi",
"Edoardo M",
""
]
] |
0706.2041 | Alexei A. Starobinsky | Alexei A. Starobinsky | Disappearing cosmological constant in f(R) gravity | 8 pages, footnote clarified, grammatical typo corrected, references
added, final version to be published in JETPL | JETP Lett.86:157-163,2007 | 10.1134/S0021364007150027 | null | astro-ph gr-qc hep-th | null | For higher-derivative f(R) gravity where R is the Ricci scalar, a class of
models is proposed which produce viable cosmology different from the LambdaCDM
one at recent times and satisfy cosmological, Solar system and laboratory
tests. These models have both flat and de Sitter space-times as particular
solutions in the absence of matter. Thus, a cosmological constant is zero in
flat space-time, but appears effectively in a curved one for sufficiently large
R. A 'smoking gun' for these models would be small discrepancy in values of the
slope of the primordial perturbation power spectrum determined from galaxy
surveys and CMB fluctuations. On the other hand, a new problem for dark energy
models based on f(R) gravity is pointed which is connected with possible
overproduction of new massive scalar particles (scalarons) arising in this
theory in the very early Universe.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 05:32:07 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Jun 2007 09:47:06 GMT"
}
] | 2009-07-09T00:00:00 | [
[
"Starobinsky",
"Alexei A.",
""
]
] |
0706.2042 | Nakwoo Kim | Hyojoong Kim, Kyung Kiu Kim and Nakwoo Kim | 1/4-BPS M-theory bubbles with SO(3) x SO(4) symmetry | 22 pages, JHEP3.cls; v2. revised version. showed that our results
agree with previous works hep-th/0605146 and hep-th/0612196 | JHEP 0708:050,2007 | 10.1088/1126-6708/2007/08/050 | null | hep-th | null | In this paper we generalize the work of Lin, Lunin and Maldacena on the
classification of 1/2-BPS M-theory solutions to a specific class of 1/4-BPS
configurations. We are interested in the solutions of 11 dimensional
supergravity with $SO(3)\times SO(4)$ symmetry, and it is shown that such
solutions are constructed over a one-parameter familiy of 4 dimensional almost
Calabi-Yau spaces. Through analytic continuations we can obtain M-theory
solutions having $AdS_2\times S^3$ or $AdS_3\times S^2$ factors. It is shown
that our result is equivalent to the $AdS$ solutions which have been recently
reported as the near-horizon geometry of M2 or M5-branes wrapped on 2 or
4-cycles in Calabi-Yau threefolds. We also discuss the hierarchy of M-theory
bubbles with different number of supersymmetries.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 05:57:07 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Jul 2007 22:05:22 GMT"
}
] | 2009-04-30T00:00:00 | [
[
"Kim",
"Hyojoong",
""
],
[
"Kim",
"Kyung Kiu",
""
],
[
"Kim",
"Nakwoo",
""
]
] |
0706.2043 | Peter Danenhower | Peter Danenhower | Phase Spaces in Special Relativity: Towards Eliminating Gravitational
Singularities | 18 pages, amslatex | null | null | null | astro-ph | null | This paper shows one way to construct phase spaces in special relativity by
expanding Minkowski Space. These spaces appear to indicate that we can dispense
with gravitational singularities. The key mathematical ideas in the present
approach are to include a complex phase factor, such as, e^{i\phi} in the
Lorentz transformation and to use both the proper time and the proper mass as
parameters. To develop the most general case, a complex parameter \sigma=s+im,
is introduced, where s is the proper time, and m is the proper mass, and \sigma
and {\sigma}/{|\sigma|} are used to parameterize the position of a particle (or
reference frame) in space-time-matter phase space. A new reference variable,
u={m}/{r}, is needed (in addition to velocity), and assumed to be bounded by 0
and {c^{2}}/{G}=1, in geometrized units. Several results are derived: The
equation E=mc^2 apparently needs to be modified to
E^2={s^2c^{10}}/{G^2}+m^2c^4, but a simpler (invariant) parameter is the
"energy to length" ratio, which is {c^4}/{G} for any spherical region of
space-time-matter. The generalized "momentum vector" becomes completely
"masslike" for u\approx 0.79, which we think indicates the existence of a
maximal gravity field. Thus, gravitational singularities do not occur. Instead,
as u approaches 1 matter is apparently simply crushed into free space. In the
last section of this paper we attempt some further generalizations of the phase
space ideas developed in this paper.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 06:00:40 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Danenhower",
"Peter",
""
]
] |
0706.2044 | Young-Eun Choi | Young-Eun Choi, Kasra Rafi, and Caroline Series | Lines of minima are uniformly quasi-geodesic | 23 pages, 2 figures, revised exposition | null | null | null | math.GT | null | We continue the comparison between lines of minima and Teichmueller geodesics
begun in [CRS1]. We show that in the Teichmueller space of a surface S, lines
of minima are quasi-geodesic with respect to the Teichmueller metric. The
quasi-geodesic constants depend only on the topological type of S.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 06:11:22 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Mar 2008 16:45:11 GMT"
}
] | 2008-03-13T00:00:00 | [
[
"Choi",
"Young-Eun",
""
],
[
"Rafi",
"Kasra",
""
],
[
"Series",
"Caroline",
""
]
] |
0706.2045 | Jeremy Dalseno | J. Dalseno (for the Belle Collaboration) | Measurement of Branching Fraction and Time-Dependent CP Asymmetry
Parameters in B0 -> D*+ D*- Ks Decays | 13 pages, 4 figures Submitted to PRD Upper limit changed | Phys.Rev.D76:072004,2007 | 10.1103/PhysRevD.76.072004 | null | hep-ex | null | We present a measurement of the branching fraction and time-dependent CP
violation parameters for B0 -> D*+ D*- Ks decays. We also obtain an upper limit
on the product branching fraction for the possible two-body decay, B0 ->
Ds1+(2536) D*-. These results are obtained from a 414 fb-1 data sample that
contains 449e10^6 BBbar pairs collected at the Upsilon(4S) resonance with the
Belle detector at the KEKB asymmetric e+e- collider.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 06:26:35 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Aug 2007 04:43:25 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Dalseno",
"J.",
"",
"for the Belle Collaboration"
]
] |
0706.2046 | Sangheon Yun | Sangheon Yun | Non-Supersymmetric Unattractors in Born-Infeld Black Holes | 20 pages | null | null | null | hep-th | null | We investigate unattractor behavior in non-extremal black holes in
Einstein-Born-Infeld-Dilaton theory of gravity in four-dimensional
asymptotically flat spacetime. We obtain solutions which are non-singular near
the horizon and dependent on the value of the dilaton field at the infinity,
using perturbation method. It is shown that the value of the scalar field at
the horizon is determined by its asymptotic value and the charges carried by
the black hole. And we also find it is not true in general that the dilaton
value at the horizon is a monotonically increasing function of the first
coefficient of its series expansion in non-extremal Born-Infeld black holes.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 06:49:22 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Yun",
"Sangheon",
""
]
] |
0706.2047 | Nobuhito Kokubo | N. Kokubo, T. Asada, K. Kadowaki, K. Takita,1 T. G. Sorop, and P. H.
Kes | Dynamic ordering of driven vortex matter in the peak effect regime of
amorphous MoGe films and 2H-NbSe2 crystals | 9 pages, 6 figures | Phys. Rev. B 75, 184512 (2007) | 10.1103/PhysRevB.75.184512 | null | cond-mat.supr-con cond-mat.dis-nn | null | Dynamic ordering of driven vortex matter has been investigated in the peak
effect regime of both amorphous MoGe films and 2H-NbSe2 crystals by mode
locking (ML) and dc transport measurements. ML features allow us to trace how
the shear rigidity of driven vortices evolves with the average velocity.
Determining the onset of ML resonance in different magnetic fields and/or
temperatures, we find that the dynamic ordering frequency (velocity) exhibits a
striking divergence in the higher part of the peak effect regime.
Interestingly, this phenomenon is accompanied by a pronounced peak of dynamic
critical current. Mapping out field-temperature phase diagrams, we find that
divergent points follow well the thermodynamic melting curve of the ideal
vortex lattice over wide field and/or temperature ranges. These findings
provide a link between the dynamic and static melting phenomena which can be
distinguished from the disorder induced peak effect.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 07:00:34 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Kokubo",
"N.",
""
],
[
"Asada",
"T.",
""
],
[
"Kadowaki",
"K.",
""
],
[
"Takita",
"K.",
""
],
[
"Sorop",
"1 T. G.",
""
],
[
"Kes",
"P. H.",
""
]
] |
0706.2048 | Akihisa Ichiki | Akihisa Ichiki and Masatoshi Shiino | Thouless-Anderson-Palmer equation for analog neural network with
temporally fluctuating white synaptic noise | 13 pages, 3 figures | null | 10.1088/1751-8113/40/31/002 | null | cond-mat.dis-nn cond-mat.stat-mech | null | Effects of synaptic noise on the retrieval process of associative memory
neural networks are studied from the viewpoint of neurobiological and
biophysical understanding of information processing in the brain. We
investigate the statistical mechanical properties of stochastic analog neural
networks with temporally fluctuating synaptic noise, which is assumed to be
white noise. Such networks, in general, defy the use of the replica method,
since they have no energy concept. The self-consistent signal-to-noise analysis
(SCSNA), which is an alternative to the replica method for deriving a set of
order parameter equations, requires no energy concept and thus becomes
available in studying networks without energy functions. Applying the SCSNA to
stochastic network requires the knowledge of the Thouless-Anderson-Palmer (TAP)
equation which defines the deterministic networks equivalent to the original
stochastic ones. The study of the TAP equation which is of particular interest
for the case without energy concept is very few, while it is closely related to
the SCSNA in the case with energy concept. This paper aims to derive the TAP
equation for networks with synaptic noise together with a set of order
parameter equations by a hybrid use of the cavity method and the SCSNA.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 12:00:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ichiki",
"Akihisa",
""
],
[
"Shiino",
"Masatoshi",
""
]
] |
0706.2049 | Ethan Cotterill | Ethan Cotterill | Geometry of curves with exceptional secant planes: linear series along
the general curve | The 2007 paper has been split in two; this is the first part, to
appear in Math Zeit | null | null | null | math.AG math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study linear series on a general curve of genus $g$, whose images are
exceptional with regard to their secant planes. Working in the framework of an
extension of Brill-Noether theory to pairs of linear series, we prove that a
general curve has no linear series with exceptional secant planes, in a very
precise sense, whenever the total number of series is finite. Next, we
partially solve the problem of computing the number of linear series with
exceptional secant planes in a one-parameter family in terms of tautological
classes associated with the family, by evaluating our hypothetical formula
along judiciously-chosen test families. As an application, we compute the
number of linear series with exceptional secant planes on a general curve
equipped with a one-dimensional family of linear series. We pay special
attention to the extremal case of $d$-secant $(d-2)$-planes to
$(2d-1)$-dimensional series, which appears in the study of Hilbert schemes of
points on surfaces. In that case, our formula may be rewritten in terms of
hypergeometric series, which allows us both to prove that it is nonzero and to
deduce its asymptotics in $d$.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 07:54:28 GMT"
},
{
"version": "v2",
"created": "Sun, 24 Jun 2007 15:05:57 GMT"
},
{
"version": "v3",
"created": "Fri, 2 Apr 2010 11:14:12 GMT"
}
] | 2010-04-05T00:00:00 | [
[
"Cotterill",
"Ethan",
""
]
] |
0706.2050 | Georgi Dvali | Gia Dvali | Black Holes and Large N Species Solution to the Hierarchy Problem | 13 pages, Latex | Fortsch.Phys.58:528-536,2010 | 10.1002/prop.201000009 | null | hep-th | null | We provide the perturbative and non-perturbative arguments showing that
theories with large number of species of the quantum fields, imply an
inevitable hierarchy between the masses of the species and the Planck scale,
shedding a different light on the hierarchy problem. In particular, using the
black hole physics, we prove that any consistent theory that includes N number
of the Z_2-conserved species of the quantum fields of mass \Lambda, puts a
lower bound on the Planck mass, which in large N limit is given by N\Lambda^2.
An useful byproduct of this proof is that any exactly conserved quantum charge,
not associated with a long-range classical field, must be defined maximum
modulo N, bounded by the the ratio of the Planck to the unit charge masses
squared. For example, a continuous global U(1) `baryon number' symmetry, must
be explicitly broken by gravity, at least down to a Z_N subgroup, with N
bounded by the ratio of the Planck to baryon masses squared. The same
constraint applies to any discrete gauge symmetry, as well as to other
quantum-mechanically detectable black hole charges that are associated with the
massive quantum hair of the black hole. We show that the
gravitationally-coupled N-species sector that solves the gauge hirearchy
problem, should be probed by LHC.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 07:30:55 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Dvali",
"Gia",
""
]
] |
0706.2051 | Wojciech Koz{\l}owski Mr | Wojciech Kozlowski, Szymon M. Walczak | Collapse of unit horizontal bundles equipped with a metric of
Cheeger-Gromoll type | 9 pages | null | null | null | math.DG math.MG | null | We study unit horizontal bundles associated with Riemannian submersions.
First we investigate metric properties of an arbitrary unit horizontal bundle
equipped with a Riemannian metric of the Cheeger-Gromoll type. Next we examine
it from the Gromov-Hausdorff convergence theory point of view, and we state a
collapse theorem for unit horizontal bundles associated with a sequence of
warped Riemannian submersions.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 07:36:22 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Kozlowski",
"Wojciech",
""
],
[
"Walczak",
"Szymon M.",
""
]
] |
0706.2052 | Masayuki Ohzeki | Masayuki Ohzeki | Multicritical Points of Potts Spin Glasses on the Triangular Lattice | 18 pages, 2, figures | null | 10.1143/JPSJ.76.114003 | null | cond-mat.dis-nn cond-mat.stat-mech | null | We predict the locations of several multicritical points of the Potts spin
glass model on the triangular lattice. In particular, continuous multicritical
lines, which consist of multicritical points, are obtained for two types of
two-state Potts (i.e., Ising) spin glasses with two- and three-body
interactions on the triangular lattice. These results provide us with numerous
examples to further verify the validity of the conjecture, which has succeeded
in deriving highly precise locations of multicritical points for several spin
glass models. The technique, called the direct triangular duality, a variant of
the ordinary duality transformation, directly relates the triangular lattice
with its dual triangular lattice in conjunction with the replica method.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 07:58:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ohzeki",
"Masayuki",
""
]
] |
0706.2053 | Michael Sadovsky | Michael G.Sadovsky, Maria Yu.Senashova, Kristina A.Kourshakova | Simple Model of Complex Reflection Behaviour in Two-Species Community | 10 pages, no figures | null | null | null | q-bio.PE | null | The model of smart migration for two-species community is developed, where
the individuals implement reflexive strategy of spatial redistribution.
Simulations have been used to figure out the situations where reflexy gives an
advantage over a non-reflexive spatial behaviour, and vice versa.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 08:05:10 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Sadovsky",
"Michael G.",
""
],
[
"Senashova",
"Maria Yu.",
""
],
[
"Kourshakova",
"Kristina A.",
""
]
] |
0706.2054 | Ulrich Haisch | Ulrich Haisch and Andreas Weiler | Determining the Sign of the Z-Penguin Amplitude | 20 pages, 5 pdf figures, 5 tables, uses pdflatex; further typos
corrected, matches PRD version | Phys.Rev.D76:074027,2007 | 10.1103/PhysRevD.76.074027 | ZU-TH 6/07; CLNS 07/2001 | hep-ph hep-ex | null | We point out that the precision measurements of the pseudo observables R_b^0,
A_b, and A_FB^0,b performed at LEP and SLC suggest that in models with
minimal-flavor-violation the sign of the Z-penguin amplitude is identical to
the one present in the standard model. We determine the allowed range for the
non-standard contribution to the Inami-Lim function C and show by analyzing
possible scenarios with positive and negative interference of standard model
and new physics contributions, that the derived bound holds in each given case.
Finally, we derive lower and upper limits for the branching ratios of K^+ ->
pi^+ nu nubar, K_L -> pi^0 nu nubar, K_L -> mu^+ mu^-, B -> X_d,s nu nubar, and
B_d,s -> mu^+ mu^- within constrained minimal-flavor-violation making use of
the wealth of available data collected at the Z-pole.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 12:44:08 GMT"
},
{
"version": "v2",
"created": "Mon, 24 Sep 2007 08:13:52 GMT"
},
{
"version": "v3",
"created": "Fri, 19 Oct 2007 17:38:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Haisch",
"Ulrich",
""
],
[
"Weiler",
"Andreas",
""
]
] |
0706.2055 | Thoudam Satyendra mr | R. Koul, A.K. Tickoo, S.K. Kaul, S.R. Kaul, N. Kumar, K.K. Yadav, N.
Bhatt, K. Venugopal, H.C. Goyal, M. Kothari, P. Chandra, R.C. Rannot, V.K.
Dhar, M.K. Koul, R.K. Kaul, S. Kotwal, K. Chanchalani, S. Thoudam, N.
Chouhan, M. Sharma, S. Bhattacharyya, S. Sahayanathan | The TACTIC atmospheric Cherenkov Imaging telescope | 27 pages, 13 figures, accepted for publication in NIM A | Nucl.Instrum.Meth.A578:548-564,2007 | 10.1016/j.nima.2007.06.011 | null | astro-ph | null | The TACTIC $\gamma$-ray telescope, equipped with a light collector of area
$\sim$9.5m$^2$ and a medium resolution imaging camera of 349-pixels, has been
in operation at Mt.Abu, India since 2001. This paper describes the main
features of its various subsystems and its overall performance with regard to
(a) tracking accuracy of its 2-axes drive system, (b) spot size of the light
collector, (c) back-end signal processing electronics and topological trigger
generation scheme, (d) data acquisition and control system and (e) relative and
absolute gain calibration methodology. Using a trigger field of view of
11$\times$11 pixels ($\sim$ 3.4$^\circ$$\times3.4^\circ$), the telescope
records a cosmic ray event rate of $\sim$2.5 Hz at a typical zenith angle of
15$^\circ$. Monte Carlo simulation results are also presented in the paper for
comparing the expected performance of the telescope with actual observational
results. The consistent detection of a steady signal from the Crab Nebula above
$\sim$1.2 TeV energy, at a sensitivity level of $\sim5.0\sigma$ in $\sim$25 h,
alongwith excellent matching of its energy spectrum with that obtained by other
groups, reassures that the performance of the TACTIC telescope is quite stable
and reliable. Furthermore, encouraged by the detection of strong $\gamma$-ray
signals from Mrk 501 (during 1997 and 2006 observations) and Mrk 421 (during
2001 and 2005-2006 observations), we believe that there is considerable scope
for the TACTIC telescope to monitor similar TeV $\gamma$-ray emission activity
from other active galactic nuclei on a long term basis.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 08:51:48 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Koul",
"R.",
""
],
[
"Tickoo",
"A. K.",
""
],
[
"Kaul",
"S. K.",
""
],
[
"Kaul",
"S. R.",
""
],
[
"Kumar",
"N.",
""
],
[
"Yadav",
"K. K.",
""
],
[
"Bhatt",
"N.",
""
],
[
"Venugopal",
"K.",
""
],
[
"Goyal",
"H. C.",
""
],
[
"Kothari",
"M.",
""
],
[
"Chandra",
"P.",
""
],
[
"Rannot",
"R. C.",
""
],
[
"Dhar",
"V. K.",
""
],
[
"Koul",
"M. K.",
""
],
[
"Kaul",
"R. K.",
""
],
[
"Kotwal",
"S.",
""
],
[
"Chanchalani",
"K.",
""
],
[
"Thoudam",
"S.",
""
],
[
"Chouhan",
"N.",
""
],
[
"Sharma",
"M.",
""
],
[
"Bhattacharyya",
"S.",
""
],
[
"Sahayanathan",
"S.",
""
]
] |
0706.2056 | Ulrich Haisch | Ulrich Haisch | Recent Developments in Bbar -> X_s gamma | 7 pages, 2 figures, 1 table, based on invited talks given at the
third meeting of the workshop ``Flavour in the era of the LHC'', CERN,
Geneva, March 15--17, 2006 and at XLIInd Rencontres de Moriond, QCD and
Hadronic Interactions, La Thuile, Italy, March 17--24, 2007, v2: minor
modifications | null | null | ZU-TH 9/07 | hep-ph | null | We present a concise review of the recent theoretical progress concerning the
standard model calculation of the inclusive radiative Bbar -> X_s gamma decay.
Particular attention is thereby devoted to the calculations of the
next-to-next-to-leading order fixed-order O(alpha_s^2) contributions, non-local
O(alpha_s Lambda/m_b) power corrections, and logarithmic-enhanced O(alpha_s^2)
cut-effects to the decay rate. The current status of new physics calculations
of the inclusive b -> s gamma mode is also briefly summarized.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 08:22:25 GMT"
},
{
"version": "v2",
"created": "Sat, 23 Jun 2007 10:18:41 GMT"
}
] | 2007-06-23T00:00:00 | [
[
"Haisch",
"Ulrich",
""
]
] |
0706.2057 | Nicolas Fournier | Nicolas Fournier, Philippe Laurencot | Marcus-Lushnikov processes, Smoluchowski's and Flory's models | null | null | null | null | math.PR | null | The Marcus-Lushnikov process is a finite stochastic particle system in which
each particle is entirely characterized by its mass. Each pair of particles
with masses $x$ and $y$ merges into a single particle at a given rate $K(x,y)$.
We consider a {\it strongly gelling} kernel behaving as $K(x,y)=x^\alpha y + x
y^\alpha$ for some $\alpha\in (0,1]$. In such a case, it is well-known that
{\it gelation} occurs, that is, giant particles emerge. Then two possible
models for hydrodynamic limits of the Marcus-Lushnikov process arise: the
Smoluchowski equation, in which the giant particles are inert, and the Flory
equation, in which the giant particles interact with finite ones. We show that,
when using a suitable cut-off coagulation kernel in the Marcus-Lushnikov
process and letting the number of particles increase to infinity, the possible
limits solve either the Smoluchowski equation or the Flory equation. We also
study the asymptotic behaviour of the largest particle in the Marcus-Lushnikov
process without cut-off and show that there is only one giant particle. This
single giant particle represents, asymptotically, the lost mass of the solution
to the Flory equation.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 08:24:04 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Fournier",
"Nicolas",
""
],
[
"Laurencot",
"Philippe",
""
]
] |
0706.2058 | Denise Hagnier | Olivier Herbinet (DCPR), Paul-Marie Marquaire (DCPR), Fr\'ed\'erique
Battin-Leclerc (DCPR), Ren\'e Fournet (DCPR) | Thermal stability of n-dodecane : experiments and kinetic modelling | null | J. Anal. Appl. Pyrol. 78 (2007) 419-429 | null | null | physics.chem-ph | null | The thermal decomposition of n-dodecane, a component of some jet fuels, has
been studied in a jet-stirred reactor at temperatures from 793 to 1093 K, for
residence times between 1 and 5 s and at atmospheric pressure. Thermal
decomposition of hydrocarbon fuel prior the entrance in the combustion chamber
is an envisaged way to cool the wall of hypersonic vehicles. The products of
the reaction are mainly hydrogen, methane, ethane, 1,3-butadiene and 1-alkenes
from ethylene to 1-undecene. For higher temperatures and residence times
acetylene, allene, propyne, cyclopentene, 1,3-cyclopentadiene and aromatic
compounds from benzene to pyrene through naphthalene have also been observed. A
previous detailed kinetic model of the thermal decomposition of n-dodecane
generated using EXGAS software has been improved and completed by a
sub-mechanism explaining the formation and the consumption of aromatic
compounds.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 08:38:57 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Herbinet",
"Olivier",
"",
"DCPR"
],
[
"Marquaire",
"Paul-Marie",
"",
"DCPR"
],
[
"Battin-Leclerc",
"Frédérique",
"",
"DCPR"
],
[
"Fournet",
"René",
"",
"DCPR"
]
] |
0706.2059 | Michiko Fujii | M. Fujii, M. Iwasawa, Y. Funato, J. Makino | BRIDGE: A Direct-tree Hybrid N-body Algorithm for Fully Self-consistent
Simulations of Star Clusters and their Parent Galaxies | 12 pages, 13 figures, Accepted for PASJ | null | 10.1093/pasj/59.6.1095 | null | astro-ph | null | We developed a new direct-tree hybrid N-body algorithm for fully
self-consistent N-body simulations of star clusters in their parent galaxies.
In such simulations, star clusters need high accuracy, while galaxies need a
fast scheme because of the large number of the particles required to model it.
In our new algorithm, the internal motion of the star cluster is calculated
accurately using the direct Hermite scheme with individual timesteps and all
other motions are calculated using the tree code with second-order leapfrog
integrator. The direct and tree schemes are combined using an extension of the
mixed variable symplectic (MVS) scheme. Thus, the Hamiltonian corresponding to
everything other than the internal motion of the star cluster is integrated
with the leapfrog, which is symplectic. Using this algorithm, we performed
fully self-consistent N-body simulations of star clusters in their parent
galaxy. The internal and orbital evolutions of the star cluster agreed well
with those obtained using the direct scheme. We also performed fully
self-consistent N-body simulation for large-N models ($N=2\times 10^6$). In
this case, the calculation speed was seven times faster than what would be if
the direct scheme was used.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 08:46:24 GMT"
},
{
"version": "v2",
"created": "Fri, 27 Jul 2007 09:01:48 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Fujii",
"M.",
""
],
[
"Iwasawa",
"M.",
""
],
[
"Funato",
"Y.",
""
],
[
"Makino",
"J.",
""
]
] |
0706.2060 | Denise Hagnier | Baptiste Sirjean (DCPR), Fr\'ed\'eric Buda (DCPR), Hichem Hakka
(DCPR), Pierre-Alexandre Glaude (DCPR), Ren\'e Fournet (DCPR), Val\'erie
Warth (DCPR), Fr\'ed\'erique Battin-Leclerc (DCPR) | The autoignition of cyclopentane and cyclohexane in a shock tube | null | PROCEEDINGS OF THE COMBUSTION INSTITUTE 31 (2007) 277-284 | null | null | physics.chem-ph | null | Ignition delay times of cyclohexane-oxygen-argon and
cyclopentane-oxygen-argon mixtures have been measured in a shock tube, the
onset of ignition being detected by OH radical emission. Mixtures contained 0.5
or 1 % of hydrocarbon for equivalence ratios ranging from 0.5 to 2. Reflected
shock waves allowed temperatures from 1230 to 1800 K and pressures from 7.3 to
9.5 atm to be obtained. These measurements have shown that cyclopentane is much
less reactive than cyclohexane, as for a given temperature the observed
autoignition delay times were about ten times higher for the C5 compound
compared to the C6. Detailed mechanisms for the combustion of cyclohexane and
cyclopentane have been proposed to reproduce these results. The elementary
steps included in the kinetic models of the oxidation of cyclanes are close to
those proposed to describe the oxidation of acyclic alkanes and alkenes.
Consequently, it has been possible to obtain these models by using an improved
version of software EXGAS, a computer package developed to perform the
automatic generation of detailed kinetic models for the gas-phase oxidation and
combustion of linear and branched alkanes and alkenes. Nevertheless, the
modelling of the oxidation of cyclanes requires to consider new types of
generic reactions, and especially to define new correlations for the estimation
of the rate constants. Ab initio calculations have been used to better know
some of the rate constants used in the case of cyclopentane. The main reaction
pathways have been derived from flow rate and sensitivity analyses.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 08:59:59 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Sirjean",
"Baptiste",
"",
"DCPR"
],
[
"Buda",
"Frédéric",
"",
"DCPR"
],
[
"Hakka",
"Hichem",
"",
"DCPR"
],
[
"Glaude",
"Pierre-Alexandre",
"",
"DCPR"
],
[
"Fournet",
"René",
"",
"DCPR"
],
[
"Warth",
"Valérie",
"",
"DCPR"
],
[
"Battin-Leclerc",
"Frédérique",
"",
"DCPR"
]
] |
0706.2061 | Denise Hagnier | Baptiste Sirjean (DCPR), Ren\'e Fournet (DCPR), Pierre-Alexandre
Glaude (DCPR), M.F. Ruiz-Lopez (SRSMC) | Extension of the composite CBS-QB3 method to singlet diradical
calculations | null | Chemical Physics Letters 435 (2007) 152-156 | 10.1016/j.cplett.2006.12.055 | null | physics.chem-ph | null | The composite CBS-QB3 method is widely used to obtain accurate energies of
molecules and radicals although its use in the case of singlet diradicals gives
rise to some difficulties. The problem is related to the parameterized
correction this method introduces to account for spin-contamination. We report
a new term specifically designed to describe singlet diradicals separated by at
least one CH2 unit. As a test case, we have computed the formation enthalpy of
a series of diradicals that includes hydrocarbons as well as systems involving
heteroatoms (nitrogen, oxygen). The resulting CBS-QB3 energies are very close
to experiment.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:00:49 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Sirjean",
"Baptiste",
"",
"DCPR"
],
[
"Fournet",
"René",
"",
"DCPR"
],
[
"Glaude",
"Pierre-Alexandre",
"",
"DCPR"
],
[
"Ruiz-Lopez",
"M. F.",
"",
"SRSMC"
]
] |
0706.2062 | Denise Hagnier | Roda Bounaceur (DCPR), Pierre-Alexandre Glaude (DCPR), Ren\'e Fournet
(DCPR), Fr\'ed\'erique Battin-Leclerc (DCPR), S. Jay (IFP), A. Pires Da Cruz
(IFP) | Kinetic modelling of a surrogate diesel fuel applied to 3D auto-ignition
in HCCI engines | International Journal Vehicle Design (2007) sous presse | null | null | null | physics.chem-ph | null | The prediction of auto-ignition delay times in HCCI engines has risen
interest on detailed chemical models. This paper described a validated kinetic
mechanism for the oxidation of a model Diesel fuel (n-decane and
α-methylnaphthalene). The 3D model for the description of low and high
temperature auto-ignition in engines is presented. The behavior of the model
fuel is compared with that of n-heptane. Simulations show that the 3D model
coupled with the kinetic mechanism can reproduce experimental HCCI and Diesel
engine results and that the correct modeling of auto-ignition in the cool flame
region is essential in HCCI conditions.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:03:03 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Bounaceur",
"Roda",
"",
"DCPR"
],
[
"Glaude",
"Pierre-Alexandre",
"",
"DCPR"
],
[
"Fournet",
"René",
"",
"DCPR"
],
[
"Battin-Leclerc",
"Frédérique",
"",
"DCPR"
],
[
"Jay",
"S.",
"",
"IFP"
],
[
"Da Cruz",
"A. Pires",
"",
"IFP"
]
] |
0706.2063 | Jing-Ling Chen | Wen-Long Yang, and Jing-Ling Chen | Berry's phase for coherent states of Landau levels | 4 pages, 1 figure | Phys. Rev. A 75, 024101 (2007) | 10.1103/PhysRevA.75.024101 | null | quant-ph | null | The Berry phases for coherent states and squeezed coherent states of Landau
levels are calculated. Coherent states of Landau levels are interpreted as a
result of a magnetic flux moved adiabatically from infinity to a finite place
on the plane. The Abelian Berry phase for coherent states of Landau levels is
an analog of the Aharonov- Bohm effect. Moreover, the non-Abelian Berry phase
is calculated for the adiabatic evolution of the magnetic field B.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:11:29 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Yang",
"Wen-Long",
""
],
[
"Chen",
"Jing-Ling",
""
]
] |
0706.2064 | Denise Hagnier | Fr\'ed\'eric Buda (DCPR), Barbara Heyberger (DCPR), Ren\'e Fournet
(DCPR), Pierre-Alexandre Glaude (DCPR), Val\'erie Warth (DCPR),
Fr\'ed\'erique Battin-Leclerc (DCPR) | Modelling of the gas-phase oxidation of cyclohexane | null | Energy and Fuels 20 (2006) 1450-1459 | null | null | physics.chem-ph | null | This paper presents a modeling study of the oxidation of cyclohexane from low
to intermediate temperature (650-1050 K), including the negative temperature
coefficient (NTC) zone. A detailed kinetic mechanism has been developed using
computer-aided generation. This comprehensive low-temperature mechanism
involves 513 species and 2446 reactions and includes two additions of
cyclohexyl radicals to oxygen, as well as subsequent reactions. The rate
constants of the reactions involving the formation of bicyclic species
(isomerizations, formation of cyclic ethers) have been evaluated from
literature data. This mechanism is able to satisfactorily reproduce
experimental results obtained in a rapid-compression machine for temperatures
ranging from 650 to 900 K and in a jet-stirred reactor from 750 to 1050 K.
Flow-rate analyses have been performed at low and intermediate temperatures.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:18:08 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Buda",
"Frédéric",
"",
"DCPR"
],
[
"Heyberger",
"Barbara",
"",
"DCPR"
],
[
"Fournet",
"René",
"",
"DCPR"
],
[
"Glaude",
"Pierre-Alexandre",
"",
"DCPR"
],
[
"Warth",
"Valérie",
"",
"DCPR"
],
[
"Battin-Leclerc",
"Frédérique",
"",
"DCPR"
]
] |
0706.2065 | Joan Porti | Laurent Bessi\`eres, G\'erard Besson, Michel Boileau, Sylvain Maillot,
Joan Porti | Weak collapsing and geometrisation of aspherical 3-manifolds | Improved version in English | null | null | null | math.GT | null | Let M be a closed, orientable, irreducible, non-simply connected 3-manifold.
We prove that if M admits a sequence of Riemannian metrics whose sectional
curvature is locally controlled and whose thick part becomes asymptotically
hyperbolic and has a sufficiently small volume, then M is Seifert fibred or
contains an incompressible torus. This result gives an alternative approach for
the last step in Perelman's proof of the Geometrisation Conjecture for
aspherical 3-manifolds.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:25:14 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 16:10:42 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Bessières",
"Laurent",
""
],
[
"Besson",
"Gérard",
""
],
[
"Boileau",
"Michel",
""
],
[
"Maillot",
"Sylvain",
""
],
[
"Porti",
"Joan",
""
]
] |
0706.2066 | Denise Hagnier | Olivier Herbinet (DCPR), Baptiste Sirjean (DCPR), Roda Bounaceur
(DCPR), Ren\'e Fournet (DCPR), Fr\'ed\'erique Battin-Leclerc (DCPR), G\'erard
Scacchi (DCPR), Paul-Marie Marquaire (DCPR) | Primary reactions of the thermal decomposition of tricyclodecane | null | J. Phys. Chem. A 110, 39 (2006) 11298-11314 | null | null | physics.chem-ph | null | In order to better understand the thermal decomposition of polycyclanes, the
pyrolysis of tricyclodecane has been studied in a jet-stirred reactor at
temperatures from 848 to 933 K, for residence times between 0.5 and 6 s and at
atmospheric pressure, in order to obtain a conversion between 0.01 and 25 %.
The main products of the reaction are hydrogen, methane, ethylene, ethane,
propene, 1,3-cyclopentadiene, cyclopentene, benzene, 1,5-hexadiene, toluene and
3-cyclopentyl-cyclopentene. A primary mechanism containing all the possible
initiation steps, including those involving diradicals, as well as propagation
reactions has been developed and allows experimental results to be
satisfactorily modeled. The main reaction pathways of consumption of
tricyclodecane and of formation of the main products have been derived from
flow rate and sensitivity analyses.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:30:54 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Herbinet",
"Olivier",
"",
"DCPR"
],
[
"Sirjean",
"Baptiste",
"",
"DCPR"
],
[
"Bounaceur",
"Roda",
"",
"DCPR"
],
[
"Fournet",
"René",
"",
"DCPR"
],
[
"Battin-Leclerc",
"Frédérique",
"",
"DCPR"
],
[
"Scacchi",
"Gérard",
"",
"DCPR"
],
[
"Marquaire",
"Paul-Marie",
"",
"DCPR"
]
] |
0706.2067 | Denise Hagnier | Fr\'ed\'eric Buda (DCPR), Pierre-Alexandre Glaude (DCPR),
Fr\'ed\'erique Battin-Leclerc (DCPR), Richard Porter, Kevin J. Hughes, John
F. Griffiths | Use of detailed kinetic mechanisms for the prediction of autoignitions | null | Journal of Loss Prevention in the Process Industries 19 (2006)
227-232 | null | null | physics.chem-ph | null | This paper describes how automatically generated detailed kinetic mechanisms
are obtained for the oxidation of alkanes and how these models could lead to a
better understanding of autoignition and cool flame risks at elevated
conditions. Examples of prediction of the occurrence of different autoignition
phenomena, such as cool flames or two-stage ignitions are presented depending
on the condition of pressure, temperature and mixture composition. Three
compounds are treated, a light alkane, propane, and two heavier ones, n-heptane
and n-decane.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:31:51 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Buda",
"Frédéric",
"",
"DCPR"
],
[
"Glaude",
"Pierre-Alexandre",
"",
"DCPR"
],
[
"Battin-Leclerc",
"Frédérique",
"",
"DCPR"
],
[
"Porter",
"Richard",
""
],
[
"Hughes",
"Kevin J.",
""
],
[
"Griffiths",
"John F.",
""
]
] |
0706.2068 | Denise Hagnier | Hadj-Ali Gueniche (DCPR), Pierre-Alexandre Glaude (DCPR), Ren\'e
Fournet (DCPR), Fr\'ed\'erique Battin-Leclerc (DCPR) | Experimental study of the structure of rich premixed
1,3-butadiene/CH4/O2/Ar flame | traduit de Fizika Goreniya I Vzryva, 2006, 42, 89-95 | Combustion, Explosion and Shock Waves 42 (2006) 702-706 | null | null | physics.chem-ph | null | The structure of a laminar rich premixed 1,3-C4H6/CH4/O2/Ar flame have been
investigated. 1,3-Butadiene, methane, oxygen and argon mole fractions are
0.033; 0.2073; 0.3315, and 0.4280, respectively, for an equivalent ratio of
1.80. The flame has been stabilized on a burner at a pressure of 6.7 kPa (50
Torr). The concentration profiles of stable species were measured by gas
chromatography after sampling with a quartz probe. Quantified species included
carbon monoxide and dioxide, methane, oxygen, hydrogen, ethane, ethylene,
acetylene, propyne, allene, propene, cyclopropane, 1,3-butadiene, butenes,
1-butyne, vinylacetylene, diacetylene, C5 compounds, benzene, and toluene. The
temperature was measured thanks to a thermocouple in PtRh (6%)-PtRh (30%)
settled inside the enclosure and ranged from 900 K close to the burner up to
2100 K.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:32:33 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Gueniche",
"Hadj-Ali",
"",
"DCPR"
],
[
"Glaude",
"Pierre-Alexandre",
"",
"DCPR"
],
[
"Fournet",
"René",
"",
"DCPR"
],
[
"Battin-Leclerc",
"Frédérique",
"",
"DCPR"
]
] |
0706.2069 | Samuel Thibault | Samuel Thibault (INRIA Futurs), Raymond Namyst (INRIA Futurs),
Pierre-Andr\'e Wacrenier (INRIA Futurs) | Building Portable Thread Schedulers for Hierarchical Multiprocessors:
the BubbleSched Framework | null | Dans EuroPar (2007) | null | null | cs.DC | null | Exploiting full computational power of current more and more hierarchical
multiprocessor machines requires a very careful distribution of threads and
data among the underlying non-uniform architecture. Unfortunately, most
operating systems only provide a poor scheduling API that does not allow
applications to transmit valuable scheduling hints to the system. In a previous
paper, we showed that using a bubble-based thread scheduler can significantly
improve applications' performance in a portable way. However, since
multithreaded applications have various scheduling requirements, there is no
universal scheduler that could meet all these needs. In this paper, we present
a framework that allows scheduling experts to implement and experiment with
customized thread schedulers. It provides a powerful API for dynamically
distributing bubbles among the machine in a high-level, portable, and efficient
way. Several examples show how experts can then develop, debug and tune their
own portable bubble schedulers.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:35:30 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Thibault",
"Samuel",
"",
"INRIA Futurs"
],
[
"Namyst",
"Raymond",
"",
"INRIA Futurs"
],
[
"Wacrenier",
"Pierre-André",
"",
"INRIA Futurs"
]
] |
0706.2070 | Yosef Nir | Kfir Blum, Yosef Nir and Eli Waxman | Probing CP violation in neutrino oscillations with neutrino telescopes | 22 pages, 6 figures; v2: references added | null | null | null | hep-ph astro-ph | null | Measurements of flavor ratios of astrophysical neutrino fluxes are sensitive
to the two yet unknown mixing parameters $\theta_{13}$ and $\delta$ through the
combination $\sin\theta_{13}\cos\delta$. We extend previous studies by
considering the possibility that neutrino fluxes from more than a single type
of sources will be measured. We point out that, if reactor experiments
establish a lower bound on $\theta_{13}$, then neutrino telescopes might
establish an upper bound on $|\cos\delta|$ that is smaller than one, and by
that prove that CP is violated in neutrino oscillations. Such a measurement
requires several favorable ingredients to occur: (i) $\theta_{13}$ is not far
below the present upper bound; (ii) The uncertainties in $\theta_{12}$ and
$\theta_{23}$ are reduced by a factor of about two; (iii) Neutrino fluxes from
muon-damped sources are identified, and their flavor ratios measured with
accuracy of order 10% or better. For the last condition to be achieved with the
planned km^3 detectors, the neutrino flux should be close to the Waxman-Bahcall
bound. It motivates neutrino telescopes that are effectively about 10 times
larger than IceCube for energies of O(100 TeV), even at the expense of a higher
energy threshold.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:35:55 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 12:27:03 GMT"
}
] | 2007-07-03T00:00:00 | [
[
"Blum",
"Kfir",
""
],
[
"Nir",
"Yosef",
""
],
[
"Waxman",
"Eli",
""
]
] |
0706.2071 | John Gracey | J.A. Gracey | Three loop DIS and transversity operator anomalous dimensions in the RI'
scheme | 12 latex pages, talk presented at ACAT07 | PoSACAT:079,2007 | null | LTH 747 | hep-ph | null | We discuss the computation of the three loop anomalous dimensions for various
operators used in deep inelastic scattering in the MSbar and RI' schemes. In
particular the results for the n = 5 and 6 Wilson operators in arbitrary linear
covariant gauge in the RI' scheme are new.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:38:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gracey",
"J. A.",
""
]
] |
0706.2072 | Iver Brevik | I. Brevik, E. Elizalde, O. Gorbunova, A. V. Timoshkin | A FRW Dark Fluid with a Non-Linear Inhomogeneous Equation of State | 11 pages pdf, 2 figures; to appear in Eur. Phys. J. C | Eur.Phys.J.C52:223-228,2007 | 10.1140/epjc/s10052-007-0357-9 | null | gr-qc | null | A dark Friedman-Robertson-Walker fluid governed by a non-linear inhomogeneous
equation of state is considered which can be viewed as a conveniently simple
paradigm for a whole class of models which exhibit phase transitions from a
non-phantom towards a phantom era (superacceleration transition). From another
side, such dark fluid models may describe also quintessence-like cosmic
acceleration. Thermodynamical considerations for the processes involved, which
are of great importance in the characterization of the global evolution of the
corresponding universe, are given too. Connecting the proposed equation of
state with an anisotropic Kasner universe with viscosity, we are led to the
plausible conjecture of a dark fluid origin of the anisotropies in the early
universe.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:39:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Brevik",
"I.",
""
],
[
"Elizalde",
"E.",
""
],
[
"Gorbunova",
"O.",
""
],
[
"Timoshkin",
"A. V.",
""
]
] |
0706.2073 | Samuel Thibault | Samuel Thibault (INRIA Futurs), Fran\c{c}ois Broquedis (INRIA Futurs),
Brice Goglin (INRIA Futurs), Raymond Namyst (INRIA Futurs), Pierre-Andr\'e
Wacrenier (INRIA Futurs) | An Efficient OpenMP Runtime System for Hierarchical Arch | null | Dans International Workshop on OpenMP (IWOMP) (2007) | null | null | cs.PL | null | Exploiting the full computational power of always deeper hierarchical
multiprocessor machines requires a very careful distribution of threads and
data among the underlying non-uniform architecture. The emergence of multi-core
chips and NUMA machines makes it important to minimize the number of remote
memory accesses, to favor cache affinities, and to guarantee fast completion of
synchronization steps. By using the BubbleSched platform as a threading backend
for the GOMP OpenMP compiler, we are able to easily transpose affinities of
thread teams into scheduling hints using abstractions called bubbles. We then
propose a scheduling strategy suited to nested OpenMP parallelism. The
resulting preliminary performance evaluations show an important improvement of
the speedup on a typical NAS OpenMP benchmark application.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:43:23 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Thibault",
"Samuel",
"",
"INRIA Futurs"
],
[
"Broquedis",
"François",
"",
"INRIA Futurs"
],
[
"Goglin",
"Brice",
"",
"INRIA Futurs"
],
[
"Namyst",
"Raymond",
"",
"INRIA Futurs"
],
[
"Wacrenier",
"Pierre-André",
"",
"INRIA Futurs"
]
] |
0706.2074 | HongWei Ke | Hong-Wei Ke, Jian Tang, Xi-Qing Hao and Xue-Qian Li | Analysis on Heavy Quarkonia Transitions with Pion Emission in Terms of
the QCD Multipole Expansion and Determination of Mass Spectra of Hybrids | 16 pages, 2 figure | Phys.Rev.D76:074035,2007 | 10.1103/PhysRevD.76.074035 | null | hep-ph | null | One of the most important tasks in high energy physics is search for the
exotic states, such as glueball, hybrid and multi-quark states. The transitions
$\psi(ns)\to \psi(ms)+\pi\pi$ and $\Upsilon(ns)\to \Upsilon(ms)+\pi\pi$ attract
great attentions because they may reveal characteristics of hybrids. In this
work, we analyze those transition modes in terms of the theoretical framework
established by Yan and Kuang. It is interesting to notice that the intermediate
states between the two gluon-emissions are hybrids, therefore by fitting the
data, we are able to determine the mass spectra of hybrids. The ground hybrid
states are predicted as 4.23 GeV (for charmonium) and 10.79 GeV (for bottonium)
which do not correspond to any states measured in recent experiments, thus it
may imply that very possibly, hybrids mix with regular quarkonia to constitute
physical states. Comprehensive comparisons of the potentials for hybrids whose
parameters are obtained in this scenario with the lattice results are
presented.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:49:49 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Sep 2007 11:20:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ke",
"Hong-Wei",
""
],
[
"Tang",
"Jian",
""
],
[
"Hao",
"Xi-Qing",
""
],
[
"Li",
"Xue-Qian",
""
]
] |
0706.2075 | Andrew Pontzen | Andrew Pontzen (1), Anthony Challinor (1,2) ((1) IoA Cambridge, (2)
DAMTP Cambridge) | Bianchi Model CMB Polarization and its Implications for CMB Anomalies | Accepted for publication in MNRAS. Minor grammatical and
typographical changes to reflect version in press. 13 pages, 6 figures | null | 10.1111/j.1365-2966.2007.12221.x | null | astro-ph | null | We derive the CMB radiative transfer equation in the form of a multipole
hierarchy in the nearly-Friedmann-Robertson-Walker limit of homogeneous, but
anisotropic, universes classified via their Bianchi type. Compared with
previous calculations, this allows a more sophisticated treatment of
recombination, produces predictions for the polarization of the radiation, and
allows for reionization. Our derivation is independent of any assumptions about
the dynamical behaviour of the field equations, except that it requires
anisotropies to be small back to recombination; this is already demanded by
observations.
We calculate the polarization signal in the Bianchi VIIh case, with the
parameters recently advocated to mimic the several large-angle anomalous
features observed in the CMB. We find that the peak polarization signal is ~
1.2 micro K for the best-fit model to the temperature anisotropies, and is
mostly confined to multipoles l<10. Remarkably, the predicted large-angle EE
and TE power spectra in the Bianchi model are consistent with WMAP observations
that are usually interpreted as evidence of early reionization. However, the
power in B-mode polarisation is predicted to be similar to the E-mode power and
parity-violating correlations are also predicted by the model; the WMAP
non-detection of either of these signals casts further strong doubts on the
veracity of attempts to explain the large-angle anomalies with global
anisotropy. On the other hand, given that there exist further dynamical degrees
of freedom in the VIIh universes that are yet to be compared with CMB
observations, we cannot at this time definitively reject the anisotropy
explanation.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 15:21:55 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 15:40:19 GMT"
}
] | 2007-09-13T00:00:00 | [
[
"Pontzen",
"Andrew",
""
],
[
"Challinor",
"Anthony",
""
]
] |
0706.2076 | Klaus Aehlig | Klaus Aehlig | A Finite Semantics of Simply-Typed Lambda Terms for Infinite Runs of<br>
Automata | 23 pages | Logical Methods in Computer Science, Volume 3, Issue 3 (July 4,
2007) lmcs:1232 | 10.2168/LMCS-3(3:1)2007 | null | cs.LO | null | Model checking properties are often described by means of finite automata.
Any particular such automaton divides the set of infinite trees into finitely
many classes, according to which state has an infinite run. Building the full
type hierarchy upon this interpretation of the base type gives a finite
semantics for simply-typed lambda-trees.
A calculus based on this semantics is proven sound and complete. In
particular, for regular infinite lambda-trees it is decidable whether a given
automaton has a run or not. As regular lambda-trees are precisely recursion
schemes, this decidability result holds for arbitrary recursion schemes of
arbitrary level, without any syntactical restriction.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 09:57:27 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 15:28:50 GMT"
},
{
"version": "v3",
"created": "Thu, 1 Nov 2007 15:33:34 GMT"
}
] | 2015-07-01T00:00:00 | [
[
"Aehlig",
"Klaus",
""
]
] |
0706.2077 | Michael Sadovsky | Michael G.Sadovsky, Julia A.Putintzeva | Codon Usage Bias Measured Through Entropy Approach | 15 pages, 1 figure | null | null | null | q-bio.GN | null | Codon usage bias measure is defined through the mutual entropy calculation of
real codon frequency distribution against the quasi-equilibrium one. This
latter is defined in three manners: (1) the frequency of synonymous codons is
supposed to be equal (i.e., the arithmetic mean of their frequencies); (2) it
coincides to the frequency distribution of triplets; and, finally, (3) the
quasi-equilibrium frequency distribution is defined as the expected frequency
of codons derived from the dinucleotide frequency distribution. The measure of
bias in codon usage is calculated for 125 bacterial genomes.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 10:07:48 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Sadovsky",
"Michael G.",
""
],
[
"Putintzeva",
"Julia A.",
""
]
] |
0706.2078 | Roberto Franzosi | Roberto Franzosi (Dipartimento di fisica Universita' di Firenze and
CNR-INFM) | Nonclassical dynamics of Bose condensates in an optical lattice in the
superfluid regime | 5 pages, 4 figures | Phys. Rev. A, 75, 053610 (2007) | 10.1103/PhysRevA.75.053610 | null | cond-mat.mes-hall cond-mat.other | null | A condensate in an optical lattice, prepared in the ground state of the
superfluid regime, is stimulated first by suddenly increasing the optical
lattice amplitude and then, after a waiting time, by abruptly decreasing this
amplitude to its initial value. Thus the system is first taken to the Mott
regime and then back to the initial superfluid regime. We show that, as a
consequence of this nonadiabatic process, the system falls into a configuration
far from equilibrium whose superfluid order parameter is described in terms of
a particular superposition of Glauber coherent states that we derive. We also
show that the classical equations of motion describing the time evolution of
this system are inequivalent to the standard discrete nonlinear Schreodinger
equations. By numerically integrating such equations with several initial
conditions, we show that the system loses coherence, becoming insulating.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 10:26:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Franzosi",
"Roberto",
"",
"Dipartimento di fisica Universita' di Firenze and\n CNR-INFM"
]
] |
0706.2079 | Tomislav Ivek | T. Ivek, T. Vuletic, S. Tomic, A. Akrap, H. Berger and L. Forro | Collective Charge Excitations below the Metal-to-Insulator Transition in
BaVS3 | 6 pages, 3 figures, submitted to PRB | null | 10.1103/PhysRevB.78.035110 | null | cond-mat.str-el | null | The charge response in the barium vanadium sulfide (BaVS3) single crystals is
characterized by dc resistivity and low frequency dielectric spectroscopy. A
broad relaxation mode in MHz range with huge dielectric constant ~= 10^6
emerges at the metal-to-insulator phase transition TMI ~= 67 K, weakens with
lowering temperature and eventually levels off below the magnetic transition
Tchi ~= 30 K. The mean relaxation time is thermally activated in a manner
similar to the dc resistivity. These features are interpreted as signatures of
the collective charge excitations characteristic for the orbital ordering that
gradually develops below TMI and stabilizes at long-range scale below Tchi.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 14:33:21 GMT"
},
{
"version": "v2",
"created": "Wed, 31 Oct 2007 13:52:15 GMT"
},
{
"version": "v3",
"created": "Mon, 28 Apr 2008 15:43:09 GMT"
},
{
"version": "v4",
"created": "Tue, 13 May 2008 17:04:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ivek",
"T.",
""
],
[
"Vuletic",
"T.",
""
],
[
"Tomic",
"S.",
""
],
[
"Akrap",
"A.",
""
],
[
"Berger",
"H.",
""
],
[
"Forro",
"L.",
""
]
] |
0706.2080 | Vladimir Eltsov | V.B. Eltsov, R. de Graaf, R. Hanninen, M. Krusius, R.E. Solntsev | Experiments on the twisted vortex state in superfluid 3He-B | prepared for proceedings of the QFS2007 symposium in Kazan | J. Low Temp. Phys. 150, 373 (2008) | 10.1007/s10909-007-9565-9 | null | cond-mat.soft | null | We have performed measurements and numerical simulations on a bundle of
vortex lines which is expanding along a rotating column of initially
vortex-free 3He-B. Expanding vortices form a propagating front: Within the
front the superfluid is involved in rotation and behind the front the twisted
vortex state forms, which eventually relaxes to the equilibrium vortex state.
We have measured the magnitude of the twist and its relaxation rate as function
of temperature above 0.3Tc. We also demonstrate that the integrity of the
propagating vortex front results from axial superfluid flow, induced by the
twist.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 10:12:21 GMT"
}
] | 2008-03-05T00:00:00 | [
[
"Eltsov",
"V. B.",
""
],
[
"de Graaf",
"R.",
""
],
[
"Hanninen",
"R.",
""
],
[
"Krusius",
"M.",
""
],
[
"Solntsev",
"R. E.",
""
]
] |
0706.2081 | Bojan Kuzma | A. Guterman and B. Kuzma | Preserving zeros of a polynomial | 33 pages | Guterman, A. E.; Kuzma, B. Preserving zeros of a polynomial. Comm.
Algebra 37 (2009), no. 11, 4038--4064. | null | null | math.RA | null | We study non-linear surjective mappings on subsets of ${\cal M}_n(F)$, which
preserve the zeros of some fixed polynomials in noncommuting variables.
Keywords: Matrix algebra, Multilinear polynomials, Preservers.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 19:16:13 GMT"
}
] | 2010-03-12T00:00:00 | [
[
"Guterman",
"A.",
""
],
[
"Kuzma",
"B.",
""
]
] |
0706.2082 | Douglas Murray | D. R. Murray (1), P. \"Ohberg (2), Dami\'a Gomila (3) and Stephen M.
Barnett (1) ((1) SUPA, University of Strathclyde, Glasgow, UK (2) SUPA,
Heriot-Watt University, Edinburgh, UK (3) IFISC, CSIC-UIB, Campus Universitat
Illes Balears, Palma de Mallorca, Spain) | Elementary Excitations of a Bose-Einstein Condensate in an Effective
Magnetic Field | 8 pages, 4 figures | null | 10.1103/PhysRevA.76.053626 | null | cond-mat.other | null | We calculate the low energy elementary excitations of a Bose-Einstein
Condensate in an effective magnetic field. The field is created by the
interplay between light beams carrying orbital angular momentum and the trapped
atoms. We examine the role of the homogeneous magnetic field, familiar from
studies of rotating condensates, and also investigate spectra for vector
potentials with a more general radial dependence. We discuss the instabilities
which arise and how these may be manifested.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 10:25:49 GMT"
}
] | 2016-08-14T00:00:00 | [
[
"Murray",
"D. R.",
""
],
[
"Öhberg",
"P.",
""
],
[
"Gomila",
"Damiá",
""
],
[
"Barnett",
"Stephen M.",
""
]
] |
0706.2083 | Andras Halbritter | A. Halbritter, P. Makk, Sz. Csonka, and G. Mihaly | Huge negative differential conductance in Au-H2 molecular nanojunctions | 9 pages, 8 figures | Physical Review B 77, 075402 (2008) | 10.1103/PhysRevB.77.075402 | null | cond-mat.mes-hall | null | Experimental results showing huge negative differential conductance in
gold-hydrogen molecular nanojunctions are presented. The results are analyzed
in terms of two-level system (TLS) models: it is shown that a simple TLS model
cannot produce peaklike structures in the differential conductance curves,
whereas an asymmetrically coupled TLS model gives perfect fit to the data. Our
analysis implies that the excitation of a bound molecule to a large number of
energetically similar loosely bound states is responsible for the peaklike
structures. Recent experimental studies showing related features are discussed
within the framework of our model.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 10:26:28 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 13:20:49 GMT"
}
] | 2008-02-19T00:00:00 | [
[
"Halbritter",
"A.",
""
],
[
"Makk",
"P.",
""
],
[
"Csonka",
"Sz.",
""
],
[
"Mihaly",
"G.",
""
]
] |
0706.2084 | Andrea Bertoni | Andrea Bertoni, Guido Goldoni | Phase lapses in scattering through multi-electron quantum dots:
Mean-field and few-particle regimes | 14 pages, 3 figures, RevTex4 preprint format, to appear in Phys. Rev.
B | Phys. Rev. B 75, 235318 (2007) | 10.1103/PhysRevB.75.235318 | null | cond-mat.mes-hall | null | We show that the observed evolution of the transmission phase through
multi-electron quantum dots with more than approximately ten electrons, which
shows a universal (i.e., independent of N) as yet unexplained behavior, is
consistent with an electrostatic model, where electron-electron interaction is
described by a mean-field approach. Moreover, we perform exact calculations for
an open 1D quantum dot and show that carrier correlations may give rise to a
non-universal (i.e., N-dependent) behavior of the transmission phase, ensuing
from Fano resonances, which is consistent with experiments with a few (N < 10)
carriers. Our results suggest that in the universal regime the coherent
transmission takes place through a single level while in the few-particle
regime the correlated scattering state is determined by the number of bound
particles.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 10:47:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bertoni",
"Andrea",
""
],
[
"Goldoni",
"Guido",
""
]
] |
0706.2085 | Lars Fritz | Chung-Hou Chung, Matthew T. Glossop, Lars Fritz, Marijana Kir\'can,
Kevin Ingersent, Matthias Vojta | Quantum phase transitions in a resonant-level model with dissipation:
Renormalization-group studies | 14 pages, 14 eps figures | Phys. Rev. B 76, 235103 (2007) | 10.1103/PhysRevB.76.235103 | null | cond-mat.str-el cond-mat.mes-hall | null | We study a spinless level that hybridizes with a fermionic band and is also
coupled via its charge to a dissipative bosonic bath. We consider the general
case of a power-law hybridization function $\Gamma(\w)\propto |\w|^r$ with
$r\ge 0$, and a bosonic bath spectral function $B(\w)\propto \w^s$ with $s\ge
-1$. For $r<1$ and $\mathrm{max}(0,2r-1)<s<1$, this Bose-Fermi quantum impurity
model features a continuous zero-temperature transition between a delocalized
phase, with tunneling between the impurity level and the band, and a localized
phase, in which dissipation suppresses tunneling in the low-energy limit. The
phase diagram and the critical behavior of the model are elucidated using
perturbative and numerical renormalization-group techniques, between which
there is excellent agreement in the appropriate regimes. For $r=0$ this model's
critical properties coincide with those of the spin-boson and Ising Bose-Fermi
Kondo models, as expected from bosonization.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 10:33:35 GMT"
}
] | 2008-01-17T00:00:00 | [
[
"Chung",
"Chung-Hou",
""
],
[
"Glossop",
"Matthew T.",
""
],
[
"Fritz",
"Lars",
""
],
[
"Kirćan",
"Marijana",
""
],
[
"Ingersent",
"Kevin",
""
],
[
"Vojta",
"Matthias",
""
]
] |
0706.2086 | Ralf Ulrich | R. Ulrich, J. Bl\"umer, R. Engel, F. Sch\"ussler and M. Unger | On the relation between the proton-air cross section and fluctuations of
the shower longitudinal profile | Contribution to the 30th International Cosmic Ray Conference, Merida,
Mexico, July 2007 | null | null | null | astro-ph | null | The current status and prospects of deducing the proton-air cross section
from fluorescence telescope measurements of extensive air showers are
discussed. As it is not possible to observe the point of first interaction, $X_
{\rm 1}$, directly, other observables closely linked to $X_{\rm 1}$ must be
inferred from the measured longitudinal profiles. This introduces a dependence
on the models used to describe the shower development. Systematic uncertainties
arising from this model dependence, from the reconstruction method itself and
from a possible non-proton contamination of the selected shower sample are
discussed.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:02:20 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Ulrich",
"R.",
""
],
[
"Blümer",
"J.",
""
],
[
"Engel",
"R.",
""
],
[
"Schüssler",
"F.",
""
],
[
"Unger",
"M.",
""
]
] |
0706.2087 | Elinor Irish | E. K. Irish | Generalized rotating-wave approximation for arbitrarily large coupling | 4 pages, 2 figs, REVTeX 4 | Phys. Rev. Lett. 99, 173601 (2007) | 10.1103/PhysRevLett.99.173601 | null | quant-ph | null | A generalized version of the rotating-wave approximation for the single-mode
spin-boson Hamiltonian is presented. It is shown that performing a simple
change of basis prior to eliminating the off-resonant terms results in a
significantly more accurate expression for the energy levels of the system. The
generalized approximation works for all values of the coupling strength and for
a wide range of detuning values, and may find applications in solid-state
experiments.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 16:22:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Irish",
"E. K.",
""
]
] |
0706.2088 | Gianne Derks | Gianne Derks, Ute Ebert, Bernard Meulenbroek | Laplacian instability of planar streamer ionization fronts - an example
of pulled front analysis | null | J. Nonlinear Sci. 18, 551-590 (2008) ; Nonlinear Sci. 18, 551-590
(2008) | 10.1007/s00332-008-9028-8 | null | nlin.PS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Streamer ionization fronts are pulled fronts propagating into a linearly
unstable state; the spatial decay of the initial condition of a planar front
selects dynamically one specific long time attractor out of a continuous
family. A transverse stability analysis has to take these features into
account. In this paper we introduce a framework for this transverse stability
analysis, involving stable and unstable manifolds in a weighted space. Within
this framework, a numerical dynamical systems method for the calculation of the
dispersion relation as an eigenvalue problem is defined and dispersion curves
for different values of the electron diffusion constant and of the electric
field ahead of the front are derived. Numerical solutions of the initial value
problem confirm the eigenvalue calculations. The numerical work is complemented
with analytical expressions for the dispersion relation in the limit of small
and large wave numbers and with a fit formula for intermediate wave numbers.
This empirical fit supports the conjecture that the smallest unstable wave
length of the Laplacian instability is proportional to the diffusion length
that characterizes the leading edge of the pulled ionization front.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:04:49 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jun 2008 08:02:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Derks",
"Gianne",
""
],
[
"Ebert",
"Ute",
""
],
[
"Meulenbroek",
"Bernard",
""
]
] |
0706.2089 | Petra E. J\"onsson | P. E. J\"onsson, K. Takenaka, S. Niitaka, T. Sasagawa, S. Sugai, and
H. Takagi | Electron Correlation Driven Heavy-Fermion Formation in LiV2O4 | 5 pages, 3 figures | Phys. Rev. Lett. 99, 167402 (2007) | 10.1103/PhysRevLett.99.167402 | null | cond-mat.str-el | null | Optical reflectivity measurements were performed on a single crystal of the
d-electron heavy-fermion (HF) metal LiV2O4. The results evidence the highly
incoherent character of the charge dynamics for all temperatures above T^*
\approx 20 K. The spectral weight of the optical conductivity is redistributed
over extremely broad energy scales (~ 5 eV) as the quantum coherence of the
charge carriers is recovered. This wide redistribution is, in sharp contrast to
f-electron Kondo lattice HF systems, characteristic of a metallic system close
to a correlation driven insulating state. Our results thus reveal that strong
electronic correlation effects dominate the low-energy charge dynamics and
heavy quasiparticle formation in LiV2O4. We propose the geometrical
frustration, which limits the extension of charge and spin ordering, as an
additional key ingredient of the low-temperature heavy-fermion formation in
this system.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:44:20 GMT"
}
] | 2007-10-24T00:00:00 | [
[
"Jönsson",
"P. E.",
""
],
[
"Takenaka",
"K.",
""
],
[
"Niitaka",
"S.",
""
],
[
"Sasagawa",
"T.",
""
],
[
"Sugai",
"S.",
""
],
[
"Takagi",
"H.",
""
]
] |
0706.2090 | Steven Watterson | Steven Watterson | The flavour projection of staggered fermions and the quarter-root trick | 8 pages, including title page | JHEP 0706:048,2007 | 10.1088/1126-6708/2007/06/048 | null | hep-lat | null | It is shown that the flavour projection of staggered fermions can be written
as a projection between the fields on four separate, but parallel, lattices,
where the fields on each are modified forms of the standard staggered fermion
field. Because the staggered Dirac operator acts equally on each lattice, it
respects this flavour projection. We show that the system can be gauged in the
usual fashion and that this does not interfere with flavour projection. We also
consider the path integral, showing that, prior to flavour projection, it
evaluates to the same form on each lattice and that this form is equal to that
used in the quarter-root trick. The flavour projection leaves a path integral
for a single flavour of field on each lattice.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 13:50:37 GMT"
}
] | 2010-10-27T00:00:00 | [
[
"Watterson",
"Steven",
""
]
] |
0706.2091 | Qingfeng Li | Qingfeng Li, Marcus Bleicher, and Horst Stoecker | Pion freeze-out as seen through HBT correlations in heavy ion collisions
from FAIR/AGS to RHIC energies | 11 pages, 2 figs | J.Phys.G34:2037-2044,2007 | 10.1088/0954-3899/34/9/012 | null | nucl-th | null | We perform a systematic analysis of several HBT parameters in heavy ion
collisions from $E_{\rm beam}=2$ AGeV to $\sqrt {s_{\rm NN}}=200$ GeV within
the UrQMD transport approach and compare the results to experimental data where
available. We find that the 'lifetime' of the emission source as calculated
from $\tau \sim \sqrt{R_O^{2}-R_S^{2}}$, is larger than the experimentally
observed values at all investigated energies. The calculated volume of the pion
source ($V_f$) is found to increase monotonously with increasing beam energy
and the experimentally observed decrease of the measured $V_f$ at AGS is not
seen. Finally, we calculate the mean free path $\lambda_f=0.5-1$ fm of pions at
freeze-out and find a good description of the experimental data above the AGS
energy region, supporting the suggestion of a universal kinetic decoupling
criterion up to the highest RHIC energies.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:18:21 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Jul 2007 13:18:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Li",
"Qingfeng",
""
],
[
"Bleicher",
"Marcus",
""
],
[
"Stoecker",
"Horst",
""
]
] |
0706.2092 | Andrea Zoia | M. Marseguerra, A. Zoia | The Monte Carlo and fractional kinetics approaches to the underground
anomalous subdiffusion of contaminants | 17 pages, 18 figures | Annals of Nuclear Energy 33, 223-235 (2006) | 10.1016/j.anucene.2005.11.004 | null | cond-mat.stat-mech | null | This paper deals with a comparison of Fractional Derivative and Monte carlo
approaches to the modelling of anomalous diffusion in the field of particle
transport. The goal of this research is to provide a better insight on the
behavior of (radioactive) contaminant tracers when flowing through
heterogeneous media.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:31:56 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Marseguerra",
"M.",
""
],
[
"Zoia",
"A.",
""
]
] |
0706.2093 | Andrea Zoia | M. Marseguerra, A. Zoia | Some Insights in Superdiffusive Transport | 14 pages, 7 figures | Physica A 377, 1-14 (2007) | 10.1016/j.physa.2006.11.040 | null | cond-mat.stat-mech | null | In this paper we deal with high-order corrections for the Fractional
Derivative approach to anomalous diffusion, in super-diffusive regime, which
become relevand whenever one attempts to describe the behavior of particles
close to normal diffusion.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:41:15 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Marseguerra",
"M.",
""
],
[
"Zoia",
"A.",
""
]
] |
0706.2094 | Ujjwal Sen | Aditi Sen De, Ujjwal Sen, Jacek Dziarmaga, Anna Sanpera, Maciej
Lewenstein | Frustration, Area Law, and Interference in Quantum Spin Models | 4 (+ epsilon) pages, 1 eps figure, RevTeX4; v1: 4 pages, 2 eps
figures; v2: presentation improved, further models analyzed, published
version | Phys. Rev. Lett. 101, 187202 (2008) | 10.1103/PhysRevLett.101.187202 | null | quant-ph cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study frustrated quantum systems from a quantum information perspective.
Within this approach, we find that highly frustrated systems do not follow any
general ''area law'' of block entanglement, while weakly frustrated ones have
area laws similar to those of nonfrustrated systems away from criticality. To
calculate the block entanglement in systems with degenerate ground states,
typical in frustrated systems, we define a ''cooling'' procedure of the ground
state manifold, and propose a frustration degree and a method to quantify
constructive and destructive interference effects of entanglement.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:46:41 GMT"
},
{
"version": "v2",
"created": "Thu, 30 Oct 2008 15:49:01 GMT"
}
] | 2008-10-30T00:00:00 | [
[
"De",
"Aditi Sen",
""
],
[
"Sen",
"Ujjwal",
""
],
[
"Dziarmaga",
"Jacek",
""
],
[
"Sanpera",
"Anna",
""
],
[
"Lewenstein",
"Maciej",
""
]
] |
0706.2095 | Andrea Zoia | M. Marseguerra, A. Zoia | Normal and Anomalous Transport across an Interface: Monte Carlo and
Analytical Approach | 19 pages, 6 figures | Annals of Nuclear Energy 33, 1396-1407 (2006) | 10.1016/j.anucene.2006.09.012 | null | cond-mat.stat-mech | null | In this paper we investigate the behavior of particles crossing a neat
interface between two media. A Monte Carlo and analytical model, based on
fractional derivatives, are presented and discussed in detail, together with a
comparison. Anomalous and normal diffusion are consdered.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:49:30 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Marseguerra",
"M.",
""
],
[
"Zoia",
"A.",
""
]
] |
0706.2096 | Markus Roth | Markus Roth (for the Auger Collaboration) | Measurement of the UHECR energy spectrum using data from the Surface
Detector of the Pierre Auger Observatory | Contribution to the 30th International Cosmic Ray Conference, Merida,
Mexico, July 2007, 4 pages, 6 figures | null | null | null | astro-ph | null | At the southern site of the Pierre Auger Observatory, which is close to
completion, an exposure that significantly exceeds the largest forerunner
experiments has already been accumulated. We report a measurement of the cosmic
ray energy spectrum based on the high statistics collected by the surface
detector. The methods developed to determine the spectrum from reconstructed
observables are described. The energy calibration of the observables, which
exploits the correlation of surface detector data with fluorescence
measurements in hybrid events, is presented in detail. The methods are simple
and robust, exploiting the combination of fluorescence detector (FD) and
surface detector (SD) and do not rely on detailed numerical simulation or any
assumption about the chemical composition. Besides presenting statistical
uncertainties, we address the impact of systematic uncertainties.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:50:48 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Roth",
"Markus",
"",
"for the Auger Collaboration"
]
] |
0706.2097 | Giuliano Scarcelli | Yanhua Shih | The Physics of 2 is not 1+1 | null | null | null | null | quant-ph | null | One of the most surprising consequences of quantum mechanics is the
entanglement of two or more distant particles. In an entangled EPR two-particle
system, the value of the momentum (position) for neither single subsystem is
determined. However, if one of the subsystems is measured to have a certain
momentum (position), the other subsystem is determined to have a unique
corresponding value, despite the distance between them. This peculiar behavior
of an entangled quantum system has surprisingly been observed experimentally in
two-photon temporal and spatial correlation measurements, such as ghost
interference and ghost imaging. This article addresses the fundamental concerns
behind these experimental observations and to explore the nonclassical nature
of two-photon superposition by emphasizing the physics of 2 is not 1 + 1.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:51:19 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Jun 2007 13:05:24 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Shih",
"Yanhua",
""
]
] |
0706.2098 | Jerome Perez | Julien Larena (LUTH, ObS. Paris-Meudon, France); Jerome Perez (Applied
Math Lab., ENSTA, PAris, France) | Integrability of anisotropic and homogeneous Universes in scalar-tensor
theory of gravitation | 16 pages, no figure, accepted in CQG | Class.Quant.Grav.24:2901-2915,2007 | 10.1088/0264-9381/24/11/008 | null | gr-qc | null | In this paper, we develop a method based on the analysis of the Kovalewski
exponents to study the integrability of anisotropic and homogeneous Universes.
The formalism is developed in scalar-tensor gravity, the general relativistic
case appearing as a special case of this larger framework. Then, depending on
the rationality of the Kovalewski exponents, the different models, both in the
vacuum and in presence of a barotropic matter fluid, are classified, and their
integrability is discussed.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:53:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Larena",
"Julien",
"",
"LUTH, ObS. Paris-Meudon, France"
],
[
"Perez",
"; Jerome",
"",
"Applied\n Math Lab., ENSTA, PAris, France"
]
] |
0706.2099 | Andrea Zoia | M. Marseguerra, A. Zoia | Monte Carlo evaluation of FADE approach to anomalous kinetics | 13 pages, 6 figures | Mathematics and Computers in Simulation 77 (4), 345-357 (2008) | 10.1016/j.matcom.2007.03.001 | null | cond-mat.stat-mech | null | In this paper we propose a comparison between the CTRW (Monte Carlo) and
Fractional Derivative approaches to the modelling of anomalous diffusion
phenomena in the presence of an advection field. Galilei variant and invariant
schemes are revised.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:55:17 GMT"
}
] | 2009-03-23T00:00:00 | [
[
"Marseguerra",
"M.",
""
],
[
"Zoia",
"A.",
""
]
] |
0706.2100 | Sergio Cristallo | S. Cristallo, O. Straniero, M.T. Lederer, B. Aringer | Molecular opacities for low-mass metal-poor AGB stars undergoing the
Third Dredge Up | 23 pages, 8 figures, accepted for publication in ApJ | Astrophys.J.667:489-496,2007 | 10.1086/520833 | null | astro-ph | null | The concomitant overabundances of C, N and s-process elements are commonly
ascribed to the complex interplay of nucleosynthesis, mixing and mass loss
taking place in Asymptotic Giant Branch stars. At low metallicity, the
enhancement of C and/or N may be up to 1000 times larger than the original iron
content and significantly affects the stellar structure and its evolution. For
this reason, the interpretation of the already available and still growing
amount of data concerning C-rich metal-poor stars belonging to our Galaxy as
well as to dwarf spheroidal galaxies would require reliable AGB stellar models
for low and very low metallicities. In this paper we address the question of
calculation and use of appropriate opacity coefficients, which take into
account the C enhancement caused by the third dredge up. A possible N
enhancement, caused by the cool bottom process or by the engulfment of protons
into the convective zone generated by a thermal pulse and the subsequent huge
third dredge up, is also considered. Basing on up-to-date stellar models, we
illustrate the changes induced by the use of these opacity on the physical and
chemical properties expected for these stars.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 11:55:19 GMT"
}
] | 2011-02-11T00:00:00 | [
[
"Cristallo",
"S.",
""
],
[
"Straniero",
"O.",
""
],
[
"Lederer",
"M. T.",
""
],
[
"Aringer",
"B.",
""
]
] |
0706.2101 | Lidia Pieri | L. Pieri, G. Bertone, E Branchini | Dark Matter Annihilation in Substructures Revised | Version accepted for publication in MNRAS. Other subhalos mass
function slopes added. All-sky analysis performed. Boost factors added. High
resolution figures for all models in http://www2.iap.fr/users/bertone/Clumps/ | Mon.Not.Roy.Astron.Soc.384:1627,2008 | 10.1111/j.1365-2966.2007.12828.x | null | astro-ph hep-ph | null | Upcoming $\gamma$-ray satellites will search for Dark Matter annihilations in
Milky Way substructures (or 'clumps'). The prospects for detecting these
objects strongly depend on the assumptions made on the distribution of Dark
Matter in substructures, and on the distribution of substructures in the Milky
Way halo. By adopting simplified, yet rather extreme, prescriptions for these
quantities, we compute the number of sources that can be detected with upcoming
experiments such as GLAST, and show that, for the most optimistic particle
physics setup ($m_\chi=40$ GeV and annihilation cross section $\sigma v = 3
\times 10^{-26}$ cm$^3$ s$^{-1}$), the result ranges from zero to $\sim$
hundred sources, all with mass above $10^{5}M\odot$. However, for a fiducial DM
candidate with mass $m_\chi=100$ GeV and $\sigma v = 10^{-26}$ cm$^3$ s$^{-1}$,
at most a handful of large mass substructures can be detected at $5 \sigma$,
with a 1-year exposure time, by a GLAST-like experiment. Scenarios where
micro-clumps (i.e. clumps with mass as small as $10^{-6}M\odot$) can be
detected are severely constrained by the diffuse $\gamma$-ray background
detected by EGRET.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 13:41:23 GMT"
},
{
"version": "v2",
"created": "Mon, 2 Jul 2007 08:13:54 GMT"
},
{
"version": "v3",
"created": "Mon, 10 Dec 2007 11:19:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pieri",
"L.",
""
],
[
"Bertone",
"G.",
""
],
[
"Branchini",
"E",
""
]
] |
0706.2102 | Estelle Moraux | Estelle Moraux (LAOG), Jerome Bouvier (LAOG), John Stauffer, David
Barrado Y Navascues, Jean-Charles Cuillandre | The lower mass function of the young open cluster Blanco 1: from 30 Mjup
to 3 Mo | 18 pages, 15 figures and 5 tables accepted in A&A | null | 10.1051/0004-6361:20066308 | null | astro-ph | null | We performed a deep wide field optical survey of the young (~100-150 Myr)
open cluster Blanco1 to study its low mass population well down into the brown
dwarf regime and estimate its mass function over the whole cluster mass
range.The survey covers 2.3 square degrees in the I and z-bands down to I ~ z ~
24 with the CFH12K camera. Considering two different cluster ages (100 and 150
Myr), we selected cluster member candidates on the basis of their location in
the (I,I-z) CMD relative to the isochrones, and estimated the contamination by
foreground late-type field dwarfs using statistical arguments, infrared
photometry and low-resolution optical spectroscopy. We find that our survey
should contain about 57% of the cluster members in the 0.03-0.6 Mo mass range,
including 30-40 brown dwarfs. The candidate's radial distribution presents
evidence that mass segregation has already occured in the cluster. We took it
into account to estimate the cluster mass function across the
stellar/substellar boundary. We find that, between 0.03Mo and 0.6Mo, the
cluster mass distribution does not depend much on its exact age, and is well
represented by a single power-law, with an index alpha=0.69 +/- 0.15. Over the
whole mass domain, from 0.03Mo to 3Mo, the mass function is better fitted by a
log-normal function with m0=0.36 +/- 0.07Mo and sigma=0.58 +/- 0.06. Comparison
between the Blanco1 mass function, other young open clusters' MF, and the
galactic disc MF suggests that the IMF, from the substellar domain to the
higher mass part, does not depend much on initial conditions. We discuss the
implications of this result on theories developed to date to explain the origin
of the mass distribution.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 12:17:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Moraux",
"Estelle",
"",
"LAOG"
],
[
"Bouvier",
"Jerome",
"",
"LAOG"
],
[
"Stauffer",
"John",
""
],
[
"Navascues",
"David Barrado Y",
""
],
[
"Cuillandre",
"Jean-Charles",
""
]
] |
0706.2103 | Patrik Recher | P. Recher, B. Trauzettel, A. Rycerz, Ya. M. Blanter, C. W. J.
Beenakker, A. F. Morpurgo | Aharonov-Bohm effect and broken valley-degeneracy in graphene rings | 7 pages, 7 figures, replaced with considerably extended new version | Phys. Rev. B 76, 235404 (2007) | 10.1103/PhysRevB.76.235404 | null | cond-mat.mes-hall | null | We analyze theoretically the electronic properties of Aharonov-Bohm rings
made of graphene. We show that the combined effect of the ring confinement and
applied magnetic flux offers a controllable way to lift the orbital degeneracy
originating from the two valleys, even in the absence of intervalley
scattering. The phenomenon has observable consequences on the persistent
current circulating around the closed graphene ring, as well as on the ring
conductance. We explicitly confirm this prediction analytically for a circular
ring with a smooth boundary modelled by a space-dependent mass term in the
Dirac equation. This model describes rings with zero or weak intervalley
scattering so that the valley isospin is a good quantum number. The tunable
breaking of the valley degeneracy by the flux allows for the controlled
manipulation of valley isospins. We compare our analytical model to another
type of ring with strong intervalley scattering. For the latter case, we study
a ring of hexagonal form with lattice-terminated zigzag edges numerically. We
find for the hexagonal ring that the orbital degeneracy can still be controlled
via the flux, similar to the ring with the mass confinement.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 16:29:09 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Sep 2007 03:31:18 GMT"
}
] | 2007-12-06T00:00:00 | [
[
"Recher",
"P.",
""
],
[
"Trauzettel",
"B.",
""
],
[
"Rycerz",
"A.",
""
],
[
"Blanter",
"Ya. M.",
""
],
[
"Beenakker",
"C. W. J.",
""
],
[
"Morpurgo",
"A. F.",
""
]
] |
0706.2104 | Anne-Laure Dalibard | Anne-Laure Dalibard (CEREMADE) | Homogenization of nonlinear scalar conservation laws | 34 pages | Archive for Rational Mechanics and Analysis (2008) ISSN: 0003-9527
(Print) 1432-0673 (Online) | 10.1007/s00205-008-0123-7 | null | math.AP | null | We study the limit as $\e\to 0$ of the entropy solutions of the equation
$\p_t \ue + \dv_x[A(\frac{x}{\e},\ue)] =0$. We prove that the sequence $\ue$
two-scale converges towards a function $u(t,x,y)$, and $u$ is the unique
solution of a limit evolution problem. The remarkable point is that the limit
problem is not a scalar conservation law, but rather a kinetic equation in
which the macroscopic and microscopic variables are mixed. We also prove a
strong convergence result in $L^1_{\text{loc}}$.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 12:22:08 GMT"
}
] | 2008-12-08T00:00:00 | [
[
"Dalibard",
"Anne-Laure",
"",
"CEREMADE"
]
] |
0706.2105 | Jerome Perez | jerome perez | Equilibrium of stellar dynamical systems in the context of the
Vlasov-Poisson model | 8 pages, no figures, accepted in Communications in Nonlinear Science
and Numerical Simulation | null | 10.1016/j.cnsns.2007.05.011 | null | astro-ph | null | This short review is devoted to the problem of the equilibrium of stellar
dynamical systems in the context of the Vlasov-Poisson model. In a first part
we will review some classical problems posed by the application of the
Vlasov-Poisson model to the astrophysical systems like globular clusters or
galaxies. In a second part we will recall some recent numerical results which
may give us some some quantitative hints about the equilibrium state associated
to those systems.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 12:24:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"perez",
"jerome",
""
]
] |
0706.2106 | Tatyana Turova | T. S. Turova | The size of the largest component below phase transition in
inhomogeneous random graphs | 23 pages | null | null | 2007:14 | math.PR | null | We study the "rank 1 case" of the inhomogeneous random graph model. In the
subcritical case we derive an exact formula for the asymptotic size of the
largest connected component scaled to log n. This result is new, it completes
the corresponding known result in the supercritical case. We provide some
examples of application of a new formula.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 12:25:35 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Turova",
"T. S.",
""
]
] |
0706.2107 | Po-Shen Loh | Po-Shen Loh, Benny Sudakov | Constrained Ramsey Numbers | 12 pages; minor revisions | null | null | null | math.CO | null | For two graphs S and T, the constrained Ramsey number f(S, T) is the minimum
n such that every edge coloring of the complete graph on n vertices, with any
number of colors, has a monochromatic subgraph isomorphic to S or a rainbow
(all edges differently colored) subgraph isomorphic to T. The Erdos-Rado
Canonical Ramsey Theorem implies that f(S, T) exists if and only if S is a star
or T is acyclic, and much work has been done to determine the rate of growth of
f(S, T) for various types of parameters. When S and T are both trees having s
and t edges respectively, Jamison, Jiang, and Ling showed that f(S, T) <=
O(st^2) and conjectured that it is always at most O(st). They also mentioned
that one of the most interesting open special cases is when T is a path. In
this work, we study this case and show that f(S, P_t) = O(st log t), which
differs only by a logarithmic factor from the conjecture. This substantially
improves the previous bounds for most values of s and t.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 12:25:48 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Oct 2007 22:36:27 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Loh",
"Po-Shen",
""
],
[
"Sudakov",
"Benny",
""
]
] |
0706.2108 | Robi Peschanski | A.Bialas, R.A.Janik, and R.Peschanski | Unified description of Bjorken and Landau 1+1 hydrodynamics | 20 pages, 5 figures | Phys.Rev.C76:054901,2007 | 10.1103/PhysRevC.76.054901 | null | nucl-th hep-ph | null | We propose a generalization of the Bjorken in-out Ansatz for fluid
trajectories which, when applied to the (1+1) hydrodynamic equations, generates
a one-parameter family of analytic solutions interpolating between the
boost-invariant Bjorken picture and the non boost-invariant one by Landau. This
parameter characterises the proper-time scale when the fluid velocities
approach the in-out Ansatz. We discuss the resulting rapidity distribution of
entropy for various freeze-out conditions and compare it with the original
Bjorken and Landau results.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 12:51:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bialas",
"A.",
""
],
[
"Janik",
"R. A.",
""
],
[
"Peschanski",
"R.",
""
]
] |
0706.2109 | Heiko Scheit | H. Boie, H. Scheit, U. D. Jentschura, F. K\"ock, M. Lauer, A. I.
Milstein, I. S. Terekhov, D. Schwalm | Bremsstrahlung in alpha-Decay Reexamined | 10 pages, 5 figures, v2: fix of small typos | Phys.Rev.Lett.99:022505,2007 | 10.1103/PhysRevLett.99.022505 | null | nucl-ex nucl-th | null | A high-statistics measurement of bremsstrahlung emitted in the alpha decay of
210Po has been performed, which allows to follow the photon spectra up to
energies of ~ 500 keV. The measured differential emission probability is in
good agreement with our theoretical results obtained within the quasi classical
approximation as well as with the exact quantum mechanical calculation. It is
shown that due to the small effective electric dipole charge of the radiating
system a significant interference between the electric dipole and quadrupole
contributions occurs, which is altering substantially the angular correlation
between the alpha particle and the emitted photon.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 12:38:03 GMT"
},
{
"version": "v2",
"created": "Wed, 18 Jul 2007 07:30:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Boie",
"H.",
""
],
[
"Scheit",
"H.",
""
],
[
"Jentschura",
"U. D.",
""
],
[
"Köck",
"F.",
""
],
[
"Lauer",
"M.",
""
],
[
"Milstein",
"A. I.",
""
],
[
"Terekhov",
"I. S.",
""
],
[
"Schwalm",
"D.",
""
]
] |
0706.2110 | Po-Shen Loh | Po-Shen Loh, Benny Sudakov | On the strong chromatic number of random graphs | 16 pages | null | null | null | math.CO math.PR | null | Let G be a graph with n vertices, and let k be an integer dividing n. G is
said to be strongly k-colorable if for every partition of V(G) into disjoint
sets V_1 \cup ... \cup V_r, all of size exactly k, there exists a proper vertex
k-coloring of G with each color appearing exactly once in each V_i. In the case
when k does not divide n, G is defined to be strongly k-colorable if the graph
obtained by adding k \lceil n/k \rceil - n isolated vertices is strongly
k-colorable. The strong chromatic number of G is the minimum k for which G is
strongly k-colorable. In this paper, we study the behavior of this parameter
for the random graph G(n, p). In the dense case when p >> n^{-1/3}, we prove
that the strong chromatic number is a.s. concentrated on one value \Delta+1,
where \Delta is the maximum degree of the graph. We also obtain several weaker
results for sparse random graphs.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 12:42:21 GMT"
}
] | 2007-06-15T00:00:00 | [
[
"Loh",
"Po-Shen",
""
],
[
"Sudakov",
"Benny",
""
]
] |
0706.2111 | Benedetto Daniele Militello | B. Militello, K. Yuasa, H. Nakazato, A. Messina | Influence of dissipation on the extraction of quantum states via
repeated measurements | 10 pages, 3 figures | Phys. Rev. A. 76, 042110 (2007) | 10.1103/PhysRevA.76.042110 | null | quant-ph | null | A quantum system put in interaction with another one that is repeatedly
measured is subject to a non-unitary dynamics, through which it is possible to
extract subspaces. This key idea has been exploited to propose schemes aimed at
the generation of pure quantum states (purification). All such schemes have so
far been considered in the ideal situations of isolated systems. In this paper,
we analyze the influence of non-negligible interactions with environment during
the extraction process, with the scope of investigating the possibility of
purifying the state of a system in spite of the sources of dissipation. A
general framework is presented and a paradigmatic example consisting of two
interacting spins immersed in a bosonic bath is studied. The effectiveness of
the purification scheme is discussed in terms of purity for different values of
the relevant parameters and in connection with the bath temperature.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 10:55:18 GMT"
},
{
"version": "v2",
"created": "Fri, 27 Jul 2007 13:30:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Militello",
"B.",
""
],
[
"Yuasa",
"K.",
""
],
[
"Nakazato",
"H.",
""
],
[
"Messina",
"A.",
""
]
] |
0706.2112 | Marko Moisio | Marko Moisio | Kloosterman sums, elliptic curves, and irreducible polynomials with
prescribed trace and norm | 21 pages; revised version with somewhat more clearer proofs; to
appear in Acta Arithmetica | null | 10.4064/aa132-4-3 | null | math.NT math.CO | null | Let $\F_q$ ($q=p^r$) be a finite field. In this paper the number of
irreducible polynomials of degree $m$ in $\F_q[x]$ with prescribed trace and
norm coefficients is calculated in certain special cases and a general bound
for that number is obtained improving the bound by Wan if $m$ is small compared
to $q$. As a corollary, sharp bounds are obtained for the number of elements in
$\F_{q^3}$ with prescribed trace and norm over $\F_q$ improving the estimates
by Katz in this special case. Moreover, a characterization of Kloosterman sums
over $\F_{2^r}$ divisible by three is given generalizing the earlier result by
Charpin, Helleseth, and Zinoviev obtained only in the case $r$ odd. Finally, a
new simple proof for the value distribution of a Kloosterman sum over the field
$\F_{3^r}$, first proved by Katz and Livne, is given.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 13:02:04 GMT"
},
{
"version": "v2",
"created": "Sun, 17 Jun 2007 10:46:18 GMT"
},
{
"version": "v3",
"created": "Fri, 22 Jun 2007 07:11:24 GMT"
},
{
"version": "v4",
"created": "Wed, 27 Jun 2007 14:06:59 GMT"
},
{
"version": "v5",
"created": "Wed, 21 Nov 2007 07:52:58 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Moisio",
"Marko",
""
]
] |
0706.2113 | Antonio D\'iaz Ramos | Antonio Diaz | A family of acyclic functors | 23 pages | null | null | null | math.AT | null | We determine a family of functors from a poset to abelian groups such that
the higher direct limits vanish on them. This is done by first characterizing
the projective functors. Then a spectral sequence arising from the grading of
the poset is used. Also the dual version for injective functors and higher
inverse limits is included. Graded posets include simplicial complexes,
subdivision categories and simplex-like posets.
| [
{
"version": "v1",
"created": "Thu, 14 Jun 2007 13:04:47 GMT"
},
{
"version": "v2",
"created": "Thu, 8 Nov 2007 18:18:32 GMT"
}
] | 2007-11-08T00:00:00 | [
[
"Diaz",
"Antonio",
""
]
] |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.