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sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0707.4330 | Woong-Tae Kim | Woong-Tae Kim (Seoul National University) | Heating and Turbulence Driving by Galaxy Motions in Galaxy Clusters | 12 pages including 3 figures, To appear in ApJL | null | 10.1086/521950 | null | astro-ph | null | Using three-dimensional hydrodynamic simulations, we investigate heating and
turbulence driving in an intracluster medium (ICM) by orbital motions of
galaxies in a galaxy cluster. We consider Ng member galaxies on isothermal and
isotropic orbits through an ICM typical of rich clusters. An introduction of
the galaxies immediately produces gravitational wakes, providing perturbations
that can potentially grow via resonant interaction with the background gas.
When Ng^{1/2}Mg_11 < 100, where Mg_11 is each galaxy mass in units of 10^{11}
Msun, the perturbations are in the linear regime and the resonant excitation of
gravity waves is efficient to generate kinetic energy in the ICM, resulting in
the velocity dispersion sigma_v ~ 2.2 Ng^{1/2}Mg_11 km/s. When Ng^{1/2}Mg_11 >
100, on the other hand, nonlinear fluctuations of the background ICM destroy
galaxy wakes and thus render resonant excitation weak or absent. In this case,
the kinetic energy saturates at the level corresponding to sigma_v ~ 220 km/s.
The angle-averaged velocity power spectra of turbulence driven in our models
have slopes in the range of -3.7 to -4.3. With the nonlinear saturation of
resonant excitation, none of the cooling models considered are able to halt
cooling catastrophe, suggesting that the galaxy motions alone are unlikely to
solve the cooling flow problem.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 02:52:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kim",
"Woong-Tae",
"",
"Seoul National University"
]
] |
0707.4331 | Ilya S. Kofman | Joan Birman, Ilya Kofman | A new twist on Lorenz links | This version will be published in J. Topology (2009). 31 pages, 6
figures | Journal of Topology 2 (2009), 227-248 | 10.1112/jtopol/jtp007 | null | math.GT math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Twisted torus links are given by twisting a subset of strands on a closed
braid representative of a torus link. T--links are a natural generalization,
given by repeated positive twisting. We establish a one-to-one correspondence
between positive braid representatives of Lorenz links and T--links, so Lorenz
links and T--links coincide. Using this correspondence, we identify over half
of the simplest hyperbolic knots as Lorenz knots. We show that both hyperbolic
volume and the Mahler measure of Jones polynomials are bounded for infinite
collections of hyperbolic Lorenz links. The correspondence provides unexpected
symmetries for both Lorenz links and T-links, and establishes many new results
for T-links, including new braid index formulas.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 02:45:49 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 18:28:58 GMT"
},
{
"version": "v3",
"created": "Fri, 3 Oct 2008 19:23:41 GMT"
},
{
"version": "v4",
"created": "Tue, 21 Apr 2009 21:32:39 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Birman",
"Joan",
""
],
[
"Kofman",
"Ilya",
""
]
] |
0707.4332 | Yusuke Kuno | Yusuke Kuno | The mapping class group and the Meyer function for plane curves | 24 pages, typo added | Mathematische Annalen 342, Number 4, pp923-949, 2008 | 10.1007/s00208-008-0261-0 | null | math.GT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For each d>=2, the mapping class group for plane curves of degree d will be
defined and it is proved that there exists uniquely the Meyer function on this
group. In the case of d=4, using our Meyer function, we can define the local
signature for 4-dimensional fiber spaces whose general fibers are
non-hyperelliptic compact Riemann surfaces of genus 3. Some computations of our
local signature will be given.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:57:28 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Oct 2008 07:57:57 GMT"
}
] | 2008-10-08T00:00:00 | [
[
"Kuno",
"Yusuke",
""
]
] |
0707.4333 | Saugata Basu | Saugata Basu, Michael Kettner | Bounding the number of stable homotopy types of a parametrized family of
semi-algebraic sets defined by quadratic inequalities | 27 pages, 1 figure | Proc. Lon. Math. Soc. 39:4 (2008) 734-746 | 10.1112/plms/pdn031 | null | math.AG math.AT math.GT | null | We prove a nearly optimal bound on the number of stable homotopy types
occurring in a k-parameter semi-algebraic family of sets in $\R^\ell$, each
defined in terms of m quadratic inequalities. Our bound is exponential in k and
m, but polynomial in $\ell$. More precisely, we prove the following. Let $\R$
be a real closed field and let \[ {\mathcal P} = \{P_1,...,P_m\} \subset
\R[Y_1,...,Y_\ell,X_1,...,X_k], \] with ${\rm deg}_Y(P_i) \leq 2, {\rm
deg}_X(P_i) \leq d, 1 \leq i \leq m$. Let $S \subset \R^{\ell+k}$ be a
semi-algebraic set, defined by a Boolean formula without negations, whose atoms
are of the form, $P \geq 0, P\leq 0, P \in {\mathcal P}$. Let $\pi: \R^{\ell+k}
\to \R^k$ be the projection on the last k co-ordinates. Then, the number of
stable homotopy types amongst the fibers $S_{\x} = \pi^{-1}(\x) \cap S$ is
bounded by \[ (2^m\ell k d)^{O(mk)}. \]
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 15:06:15 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Basu",
"Saugata",
""
],
[
"Kettner",
"Michael",
""
]
] |
0707.4334 | Zong-Kuan Guo | Kazuharu Bamba, Zong-Kuan Guo, Nobuyoshi Ohta | Accelerating Cosmologies in the Einstein-Gauss-Bonnet Theory with
Dilaton | 18 pages, 10 figures, PTPTeX, accepted for publication in PTP | Prog.Theor.Phys.118:879-892,2007 | 10.1143/PTP.118.879 | KU-TP 014 | hep-th astro-ph gr-qc | null | We study cosmological solutions in the low-energy effective heterotic string
theory, which is the Einstein gravity with Gauss-Bonnet term and the dilaton.
We show that the field equations are cast into an autonomous system for flat
internal and external spaces, and derive all the fixed points in the system. We
also examine the time evolution of the solutions and whether the solutions can
give (transient) accelerated expansion of our four-dimensional space in the
Einstein frame.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:27:56 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 02:07:24 GMT"
},
{
"version": "v3",
"created": "Fri, 28 Sep 2007 08:48:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Guo",
"Zong-Kuan",
""
],
[
"Ohta",
"Nobuyoshi",
""
]
] |
0707.4335 | Jung-Tsung Shen | Jung-Tsung Shen and Shanhui Fan | Strongly-correlated multi-particle transport in one-dimension through a
quantum impurity: an outline of exact and complete solutions | 67 pages, 11 figures | Phys. Rev. A 76, 062709 (2007) | 10.1103/PhysRevA.76.062709 | null | quant-ph | null | We consider the transport properties of multiple-particle quantum states in a
class of one-dimensional systems with a single quantum impurity. In these
systems, the local interaction at the quantum impurity induces strong and
non-trivial correlations between the multi-particles. We outline an exact
theoretical approach, based upon real-space equations of motion and the Bethe
ansatz, that allows one to construct the full scattering matrix (S-matrix) for
these systems. In particular, we emphasize the need for completeness check upon
the eigenstates of the S-matrix, when these states obtained from Bethe Ansatz
are used for describing the scattering properties. As a detailed example of our
approach, we solve the transport properties of two photons incident on a single
two-level atom, when the photons are restricted to a one-dimensional system
such as a photonic crystal waveguide. Our approach predicts a number of novel
nonlinear effects involving only two photons, including background
fluorescence, spatial attraction and repulsion between the photons, as well as
the emergence of a two-photon bound state.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 05:02:12 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Shen",
"Jung-Tsung",
""
],
[
"Fan",
"Shanhui",
""
]
] |
0707.4336 | Osamu Tajima | O. Tajima, M Hazumi, et. al (for the Belle Collaboration) | Search for the CP-violating decays $\Upsilon(4S) B0\bar{B}0 J/K0_S +
J/\psi(\eta_c)K0_S$ | Submitted to PRL | Phys.Rev.Lett.99:211601,2007 | 10.1103/PhysRevLett.99.211601 | null | hep-ex | null | We report the first search for CP violating decays of the $\Upsilon(4S)$
using a data sample that contains 535 million $\Upsilon(4S)$ mesons with the
Belle detector at the KEKB asymmetric-energy e^+ e^- collider. A partial
reconstruction technique is employed to enhance the signal sensitivity. No
significant signals were observed. We obtain an upper limit of $4 \times
10^{-7}$ at the 90 % confidence level for the branching fractions of the $CP$
violating modes, $\Upsilon(4S) \to B^0\bar{B}^0 \to J/\psi K^0_S +
J/\psi(\eta_c) K^0_S$. Extrapolating the result, we find that an observation
with 5$\sigma$ significance is expected with a 30 ab^{-1} data sample, which is
within the reach of a future super B factory.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 05:11:45 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Tajima",
"O.",
""
],
[
"Hazumi",
"M",
""
]
] |
0707.4337 | Vali Bashiry | F. Zolfagharpour, V. Bashiry | Double Lepton Polarization in $\Lambda_b -->\Lambda l^+ l^-$ Decay in
the Standard Model with Fourth Generations Scenario | 36 pages, 33 figures | Nucl.Phys.B796:294-319,2008 | 10.1016/j.nuclphysb.2007.12.022 | null | hep-ph | null | This study investigates the influence of the fourth generation quarks on the
double lepton polarizations in \Lambda_b --> \Lambda \ell^+ \ell^- decay by
taking |V^\ast_{t's}V_{t'b}|= 0.005,0.01,0.02,0.03 with phase
\{60^\circ,90^\circ,120^\circ\}. We will try to obtain a constrain on the mass
of the 4th generation top like quark t', which is consistent with the $b-->
s\ell^+\ell^- rate . With the above mentioned parameters, we will try to show
that the double lepton(muon, tau) polarizations are quite sensitive to the
existence of fourth generation. It can serve as a good tool to search for new
physics effects, precisely, to search for the fourth generation quarks(t', b')
via its indirect manifestations in loop diagrams.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 05:19:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zolfagharpour",
"F.",
""
],
[
"Bashiry",
"V.",
""
]
] |
0707.4338 | Gang Wu | Gang Wu, Xiaoping Yang, and Jinming Dong | The radial breathing-like mode of the collapsed Single-walled carbon
nanotube bundle under hydrostatic pressure | null | APPLIED PHYSICS LETTERS 88, 223114 (2006) | 10.1063/1.2208274 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Using the first principles calculations we have studied the vibrational modes
and Raman spectra of a (10, 10) single-walled carbon nanotube (SWNT) bundle
under hydrostatic pressure. Detailed analysis shows that the original radial
breathing mode (RBM) of the SWNT bundle disappears after the structural phase
transition (SPT). And significantly a RBM-like mode appears at about 509
cm^{-1}, which could be considered as a fingerprint of the SPT happened in the
SWNT bundle, and further used to determine the microscopic structure of the
bundle after the SPT.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 05:24:16 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Wu",
"Gang",
""
],
[
"Yang",
"Xiaoping",
""
],
[
"Dong",
"Jinming",
""
]
] |
0707.4339 | Zheng Hua | Zheng Hua | Classification of free actions on complete intersections of four
quadrics | 17 pages, 1 table | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we classify all free actions of finite groups on Calabi-Yau
complete intersection of 4 quadrics in $\PP^7$, up to projective equivalence.
We get some examples of smooth Calabi-Yau threefolds with large nonabelian
fundamental groups. We also observe the relation between some of these examples
and moduli of polarized abelian surfaces.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 05:42:39 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Sep 2010 09:21:37 GMT"
}
] | 2010-09-23T00:00:00 | [
[
"Hua",
"Zheng",
""
]
] |
0707.4340 | Gang Wu | Gang Wu and Jinming Dong | Raman characteristic peaks induced by the topological defects of Carbon
Nanotube Intramolecular Junction | null | PHYSICAL REVIEW B 73, 245414 (2006) | 10.1103/PhysRevB.73.245414 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | The vibrational modes of some single wall carbon nanotube (SWNT)
intramolecular junctions (IMJs) have been calculated using the newest Brenner
reactive empirical bond order (REBO) potential, based upon which their
nonresonant Raman spectra have been further calculated using the empirical bond
polarizability model. It is found that the Raman peaks induced by pentagon
defects lie out of the $G$-band of the SWNTs, so the high-frequency part of the
Raman spectra of the SWNT IMJs can be used to determine experimentally their
detailed geometrical structures. Also, the intensity of the Raman spectra has a
close relation with the number of pentagon defects in the SWNT IMJs. Following
the Descartes-Euler Polyhedral Formula (DEPF), the number of heptagon defects
in the SWNT IMJs can also be determined. The first-principle calculations are
also performed, verifying the results obtained by the REBO potential. The $G$
band width of the SWNT IMJ can reflect the length of its transition region
between the pentagon and heptagon rings.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 06:10:37 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Wu",
"Gang",
""
],
[
"Dong",
"Jinming",
""
]
] |
0707.4341 | Farhad Jafarpour Hamadani | F H Jafarpour and S R Masharian | Matrix Product Steady States as Superposition of Product Shock Measures
in 1D Driven Systems | 12 pages, 1 figure | J. Stat. Mech. (2007) P10013 | 10.1088/1742-5468/2007/10/P10013 | null | cond-mat.stat-mech | null | It is known that exact traveling wave solutions exist for families of
(n+1)-states stochastic one-dimensional non-equilibrium lattice models with
open boundaries provided that some constraints on the reaction rates are
fulfilled. These solutions describe the diffusive motion of a product shock or
a domain wall with the dynamics of a simple biased random walker. The steady
state of these systems can be written in terms of linear superposition of such
shocks or domain walls. These steady states can also be expressed in a matrix
product form. We show that in this case the associated quadratic algebra of the
system has always a two-dimensional representation with a generic structure. A
couple of examples for n=1 and n=2 cases are presented.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 06:26:09 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Oct 2007 19:14:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jafarpour",
"F H",
""
],
[
"Masharian",
"S R",
""
]
] |
0707.4342 | Kosuke Sato | Kosuke Sato, Kyoko Matsushita, Yoshitaka Ishisaki, Noriko Y. Yamasaki,
Manabu Ishida, Shin Sasaki, and Takaya Ohashi | Suzaku Observations of AWM 7 Cluster of Galaxies: Temperature, Abundance
and Bulk Motions | 11 pages, 7 figures, accepted for publication in PASJ | null | 10.1093/pasj/60.sp1.S333 | null | astro-ph | null | We carried out 3 observations of the cluster of galaxies AWM 7, for the
central region and 20'-east and 20'-west offset regions, with Suzaku.
Temperature and abundance profiles are measured out to 27'~ 570 /h_70 kpc,
which corresponded to ~0.35 r_180. The temperature of the intra-cluster medium
(ICM) slightly decreases from 3.8 keV at the center to 3.4 keV in ~0.35 r_180
region, indicating a flatter profile than those in other nearby clusters.
Abundance ratio of Si to Fe is almost constant in our observation, while Mg to
Fe ratio increases with radius from the cluster center. O to Fe ratio in the
west region shows increase with radius, while that in the east region is almost
flat, though the errors are relatively large. These features suggest that the
enrichment process is significantly different between products of type II
supernovae (O and Mg) and those by type Ia supernovae (Si and Fe). We also
examined positional shift of the central energy of He-like Fe-Ka line, in
search of possible rotation of the ICM. The 90% upper limit for the
line-of-sight velocity difference was derived to be v ~ 2000 km/s, suggesting
that the ellipticity of AWM 7 is rather caused by a recent directional infall
of the gas along the large-scale filament.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 06:27:35 GMT"
}
] | 2017-01-18T00:00:00 | [
[
"Sato",
"Kosuke",
""
],
[
"Matsushita",
"Kyoko",
""
],
[
"Ishisaki",
"Yoshitaka",
""
],
[
"Yamasaki",
"Noriko Y.",
""
],
[
"Ishida",
"Manabu",
""
],
[
"Sasaki",
"Shin",
""
],
[
"Ohashi",
"Takaya",
""
]
] |
0707.4343 | Subhrangshu Sekhar Manna | K. Bhattacharya, G. Mukherjee, J. Saramaki, K. Kaski, and S. S. Manna | The International Trade Network: weighted network analysis and modelling | 5 pages, 5 figures | J. Stat. Mech. (2008) P02002 | 10.1088/1742-5468/2008/02/P02002 | null | q-fin.GN physics.soc-ph | null | Tools of the theory of critical phenomena, namely the scaling analysis and
universality, are argued to be applicable to large complex web-like network
structures. Using a detailed analysis of the real data of the International
Trade Network we argue that the scaled link weight distribution has an
approximate log-normal distribution which remains robust over a period of 53
years. Another universal feature is observed in the power-law growth of the
trade strength with gross domestic product, the exponent being similar for all
countries. Using the 'rich-club' coefficient measure of the weighted networks
it has been shown that the size of the rich-club controlling half of the
world's trade is actually shrinking. While the gravity law is known to describe
well the social interactions in the static networks of population migration,
international trade, etc, here for the first time we studied a non-conservative
dynamical model based on the gravity law which excellently reproduced many
empirical features of the ITN.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 06:29:23 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 10:15:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bhattacharya",
"K.",
""
],
[
"Mukherjee",
"G.",
""
],
[
"Saramaki",
"J.",
""
],
[
"Kaski",
"K.",
""
],
[
"Manna",
"S. S.",
""
]
] |
0707.4344 | Andy W. C. Lau | A. W. C. Lau, D. Lacoste and K. Mallick | Non-equilibrium fluctuations and mechanochemical couplings of a
molecular motor | 4 pages, 4 figures, accepted to Phys. Rev. Lett | Phys. Rev. Lett. , 99, 158102 (2007) | 10.1103/PhysRevLett.99.158102 | null | cond-mat.soft cond-mat.stat-mech | null | We investigate theoretically the violations of Einstein and Onsager
relations, and the efficiency for a single processive motor operating far from
equilibrium using an extension of the two-state model introduced by Kafri {\em
et al.} [Biophys. J. {\bf 86}, 3373 (2004)]. With the aid of the Fluctuation
Theorem, we analyze the general features of these violations and this
efficiency and link them to mechanochemical couplings of motors. In particular,
an analysis of the experimental data of kinesin using our framework leads to
interesting predictions that may serve as a guide for future experiments.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 06:41:24 GMT"
}
] | 2011-03-02T00:00:00 | [
[
"Lau",
"A. W. C.",
""
],
[
"Lacoste",
"D.",
""
],
[
"Mallick",
"K.",
""
]
] |
0707.4345 | Takeru Ken Suzuki | T.K.Suzuki (U.Tokyo), K.Sumiyoshi (Numazu CT), S. Yamada (Waseda U.) | Alfven Wave-Driven Supernova Explosion | 7 pages, 3 figures embedded, submitted to ApJ | null | 10.1086/533515 | null | astro-ph | null | We investigate the role of Alfven waves in the core-collapse supernova (SN)
explosion. We assume that Alfven waves are generated by convections inside a
proto-neutron star (PNS) and emitted from its surface. Then these waves
propagate outwards, dissipate via nonlinear processes, and heat up matter
around a stalled prompt shock. To quantitatively assess the importance of this
process for the revival of the stalled shock, we perform 1D time-dependent
hydrodynamical simulations, taking into account the heating via the dissipation
of Alfven waves that propagate radially outwards along open flux tubes. We show
that the shock revival occurs if the surface field strength is larger than
~2e15 G and if the amplitude of velocity fluctuation at the PNS surface is
larger than 20% of the local sound speed. Interestingly, the Alfven wave
mechanism is self-regulating in the sense that the explosion energy is not very
sensitive to the surface field strength and initial amplitude of Alfven waves
as long as they are larger than the threshold values given above.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 06:42:03 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Dec 2007 02:59:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Suzuki",
"T. K.",
"",
"U.Tokyo"
],
[
"Sumiyoshi",
"K.",
"",
"Numazu CT"
],
[
"Yamada",
"S.",
"",
"Waseda U."
]
] |
0707.4346 | Sairam Swaroop | Sairam S. Mallajosyula and Swapan K Pati | Effect of Protonation on the electronic properties of DNA base pairs:
Applications for molecular electronics | 5 pages, 4 Figures | null | null | null | cond-mat.mtrl-sci | null | Protonation of DNA basepairs is a reversible phenomenon which can be
controlled by tuning the pH of the system. Under mild acidic conditions, the
hydrogen bonding pattern of the DNA basepairs undergoes a change. We study the
effect of protonation on the electronic properties of the DNA basepairs to
probe for possible molecular electronics applications. We find that, under mild
acidic pH conditions, the A:T basepair shows excellent rectification behaviour
which is, however, absent in the G:C basepair. The mechanism of rectification
has been discussed using a simple chemical potential model. We also consider
the non-canonical A:A basepair and find that it can be used as efficient pH
dependent molecular switch. The switching action in A:A basepair is explained
in the light of pi-pi interactions which lead to efficient delocalization over
the entire basepair.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 06:43:47 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Mallajosyula",
"Sairam S.",
""
],
[
"Pati",
"Swapan K",
""
]
] |
0707.4347 | Subhrangshu Sekhar Manna | K. Bhattacharya, G. Mukherjee and S. S. Manna | The International Trade Network | 9 pages, 7 figures | null | 10.1007/978-88-470-0665-2_10 | null | q-fin.GN physics.soc-ph | null | Bilateral trade relationships in the international level between pairs of
countries in the world give rise to the notion of the International Trade
Network (ITN). This network has attracted the attention of network researchers
as it serves as an excellent example of the weighted networks, the link weight
being defined as a measure of the volume of trade between two countries. In
this paper we analyzed the international trade data for 53 years and studied in
detail the variations of different network related quantities associated with
the ITN. Our observation is that the ITN has also a scale invariant structure
like many other real-world networks.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 06:50:57 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Bhattacharya",
"K.",
""
],
[
"Mukherjee",
"G.",
""
],
[
"Manna",
"S. S.",
""
]
] |
0707.4348 | Cheng Shi Liu | C. S. Liu, W. C. Wu | Gap function symmetry and spin dynamics in electron-doped cuprate
superconductor | 5 RevTeX4 pages, 2 EPS figures | Phys. Rev. B 76, 014513 (2007) | 10.1103/PhysRevB.76.014513 | null | cond-mat.supr-con cond-mat.str-el | null | An antiferromagnetic (AF) spin fluctuation induced pairing model is proposed
for the electron-doped cuprate superconductors. It suggests that, similar to
the hole-doped side, the superconducting gap function is monotonic
d_{x^2-y^2}-wave and explains why the observed gap function has a nonmonotonic
d_{x^2-y^2}-wave behavior when an AF order is taken into account. Dynamical
spin susceptibility is calculated and shown to be in good agreement with the
experiment. This gives a strong support to the proposed model.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 06:55:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Liu",
"C. S.",
""
],
[
"Wu",
"W. C.",
""
]
] |
0707.4349 | Yunping Jiang | Yunping Jiang | Holomorphic Motions, Fatou Linearization, and Quasiconformal Rigidity
for Parabolic Germs | 20 pages | Michigan Math. J., 58 (2009), 517-534 | null | null | math.DS math.CV | null | By applying holomorphic motions, we prove that a parabolic germ is
quasiconformally rigid, that is, any two topologically conjugate parabolic
germs are quasiconformally conjugate and the conjugacy can be chosen to be more
and more near conformal as long as we consider these germs defined on smaller
and smaller neighborhoods. Before proving this theorem, we use the idea of
holomorphic motions to give a conceptual proof of the Fatou linearization
theorem. As a by-product, we also prove that any finite number of analytic
germs at different points in the Riemann sphere can be extended to a
quasiconformal homeomorphism which can be more and more near conformal as as
long as we consider these germs defined on smaller and smaller neighborhoods of
these points.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 07:36:20 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Aug 2007 04:26:30 GMT"
},
{
"version": "v3",
"created": "Mon, 12 Nov 2007 21:56:58 GMT"
},
{
"version": "v4",
"created": "Sun, 3 Feb 2008 20:34:20 GMT"
}
] | 2020-06-02T00:00:00 | [
[
"Jiang",
"Yunping",
""
]
] |
0707.4350 | Eros Mariani | Eros Mariani and Felix von Oppen | Flexural phonons in free-standing graphene | 4 pages, 2 figures | Phys. Rev. Lett. 100, 076801 (2008); Phys. Rev. Lett. 100,
249901(E) (2008) | 10.1103/PhysRevLett.100.076801 | null | cond-mat.mes-hall | null | Rotation and reflection symmetries impose that out-of-plane (flexural)
phonons of free-standing graphene membranes have a quadratic dispersion at long
wavelength and can be excited by charge carriers in pairs only. As a result, we
find that flexural phonons dominate the phonon contribution to the resistivity
$\rho$ below a crossover temperature T_x where we obtain an anomalous
temperature dependence $\rho\propto T^{5/2}_{}\ln T$. The logarithmic factor
arises from renormalizations of the flexural phonon dispersion due to coupling
between bending and stretching degrees of freedom of the membrane.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 07:54:17 GMT"
}
] | 2010-08-12T00:00:00 | [
[
"Mariani",
"Eros",
""
],
[
"von Oppen",
"Felix",
""
]
] |
0707.4351 | Nikulov Alexey | A.V. Nikulov | The quantum challenge on mesoscopic level | 3 pages, 2 figures | in the Proceedings of 15th International Symposium
"NANOSTRUCTURES: Physics and Technology" St Petersburg: Ioffe Institute, p.
62-63 (2007) | null | null | cond-mat.supr-con cond-mat.mes-hall | null | Most experts reject the quantum potential introduced by David Bohm in 1952.
But it is impossible to describe some quantum mesoscopic phenomena observed in
superconductor nanostructures without a quantum force.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 08:10:30 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Nikulov",
"A. V.",
""
]
] |
0707.4352 | Maria Concetta Maccarone | M.C. Maccarone (IASF-Palermo/INAF, Italy), P. Assis (LIP-Lisbon,
Portugal), O. Catalano (IASF-Palermo/INAF, Italy), G. Cusumano
(IASF-Palermo/INAF, Italy), M.C. Espirito Santo (LIP-Lisbon, Portugal), P.
Goncalves (LIP-Lisbon, Portugal), M. Moles (IAA-Granada, Spain), M. Pimenta
(LIP-Lisbon, Portugal), A. Pina (LIP-Lisbon, Portugal), B. Sacco
(IASF-Palermo/INAF, Italy), B. Tome'(LIP-Lisbon, Portugal) | Expected performance of the GAW Cherenkov Telescopes Array. Simulation
and Analysis | 5 pages, 5 figures, 1 Table, PDF format, Proceedings of 30th ICRC,
International Cosmic Ray Conference 2007, Merida, Yucatan, Mexico, 3-11 July
2007 | null | null | null | astro-ph | null | GAW is a "path-finder" experiment to test the feasibility of a new generation
of Imaging Atmospheric Cherenkov telescopes that join high flux sensitivity
with large field of view capability using Fresnel lens, stereoscopic
observational approach, and single photon counting mode. GAW is an array of
three telescopes that will be erected at the Calar Alto Observatory site
(Spain, 2150 m a.s.l.). To evaluate the performance of GAW, a consistent
data--set has been simulated, including a Crab-like source observation, and a
proper image analysis code has been developed, as described in this
contribution. The expected performance of GAW are also reported, mainly for
what concerns effective area, angular resolution, Cherenkov flux as function of
the core distance, ability in the gamma/proton separation, and sensitivity. The
first telescope realization, foreseen within the end of this year, will allow
to verify if the parameters used in the analysis are in agreement with the
"real" performance of the GAW apparatus.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 09:48:45 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Maccarone",
"M. C.",
"",
"IASF-Palermo/INAF, Italy"
],
[
"Assis",
"P.",
"",
"LIP-Lisbon,\n Portugal"
],
[
"Catalano",
"O.",
"",
"IASF-Palermo/INAF, Italy"
],
[
"Cusumano",
"G.",
"",
"IASF-Palermo/INAF, Italy"
],
[
"Santo",
"M. C. Espirito",
"",
"LIP-Lisbon, Portugal"
],
[
"Goncalves",
"P.",
"",
"LIP-Lisbon, Portugal"
],
[
"Moles",
"M.",
"",
"IAA-Granada, Spain"
],
[
"Pimenta",
"M.",
"",
"LIP-Lisbon, Portugal"
],
[
"Pina",
"A.",
"",
"LIP-Lisbon, Portugal"
],
[
"Sacco",
"B.",
"",
"IASF-Palermo/INAF, Italy"
],
[
"Tome'",
"B.",
"",
"LIP-Lisbon, Portugal"
]
] |
0707.4353 | Gang Wu | Gang Wu, Jian Zhou, and Jinming Dong | Raman modes of the deformed single-wall carbon nanotubes | null | PHYSICAL REVIEW B 72, 115411 (2005) | 10.1103/PhysRevB.72.115411 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | With the empirical bond polarizability model, the nonresonant Raman spectra
of the chiral and achiral single-wall carbon nanotubes (SWCNTs) under uniaxial
and torsional strains have been systematically studied by \textit{ab initio}
method. It is found that both the frequencies and the intensities of the
low-frequency Raman active modes almost do not change in the deformed
nanotubes, while their high-frequency part shifts obviously. Especially, the
high-frequency part shifts linearly with the uniaxial tensile strain, and two
kinds of different shift slopes are found for any kind of SWCNTs. More
interestingly, new Raman peaks are found in the nonresonant Raman spectra under
torsional strain, which are explained by a) the symmetry breaking and b) the
effect of bond rotation and the anisotropy of the polarizability induced by
bond stretching.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 08:13:00 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Wu",
"Gang",
""
],
[
"Zhou",
"Jian",
""
],
[
"Dong",
"Jinming",
""
]
] |
0707.4354 | Valerie De Lapparent | Valerie De Lapparent (IAP), Eric Slezak (OCA) | Spatial clustering in the ESO-Sculptor Survey: two-point correlation
functions by galaxy type at redshifts 0.1 - 0.5 | Astronomy & Astrophysics, in press. 29 pages, 15 color figures, 3
tables | null | 10.1051/0004-6361:20077150 | null | astro-ph | null | We calculate the spatial two-point auto and cross-correlation functions for
the 765 galaxies with Rc<21.5 and 0.1<z<0.51 in the ESO-Sculptor survey, and
explore the segregation effects among the populations of giant (early-type,
late spiral) and dwarf (dE, dI) galaxies. At separation of 0.3 h^-1 Mpc, pairs
of early-type galaxies dominate the clustering over all the other types of
pairs. At intermediate scales, 0.3-5 h^-1 Mpc, mixed pairs of dwarf and giant
galaxies contribute equally as pairs of giant galaxies, whereas the latter
dominate at ~10 h^-1 Mpc. We detect the signature of the transition between the
1-halo and 2-halo regimes which is expected in the scenario of galaxy formation
by hierarchical merging of dark matter halos. The early-type galaxies largely
outdo the late spiral galaxies in their 1-halo component, whereas the 2-halo
components of both giant populations are comparable. The dwarf galaxies have an
intermediate 1-halo component between the 2 giant galaxy types, and their
2-halo component is weak and consistent with null clustering. The present
analysis indicates that the early-type galaxies are preferentially located near
the centers of the most massive halos, whereas late spiral galaxies tend to
occupy their outskirts or the centers of less massive halos. This analysis also
unveils new results on the spatial distribution of dwarf galaxies: at the scale
at which they significantly cluster inside the halos (<0.3 h^-1 Mpc), they are
poorly mixed with the late spiral galaxies, and appear preferentially as
satellites of early-type galaxies.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 08:29:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"De Lapparent",
"Valerie",
"",
"IAP"
],
[
"Slezak",
"Eric",
"",
"OCA"
]
] |
0707.4355 | Xia Chen | Xia Chen | Moderate deviations and laws of the iterated logarithm for the local
times of additive L\'{e}vy processes and additive random walks | Published at http://dx.doi.org/10.1214/009117906000000520 in the
Annals of Probability (http://www.imstat.org/aop/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Probability 2007, Vol. 35, No. 3, 954-1006 | 10.1214/009117906000000520 | IMS-AOP-AOP0171 | math.PR | null | We study the upper tail behaviors of the local times of the additive L\'{e}vy
processes and additive random walks. The limit forms we establish are the
moderate deviations and the laws of the iterated logarithm for the L_2-norms of
the local times and for the local times at a fixed site.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 08:36:10 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Chen",
"Xia",
""
]
] |
0707.4356 | Jens Harting | Jens Harting, Hans J. Herrmann, Eli Ben-Naim | Anomalous distribution functions in sheared suspensions | 5 pages, 4 figures, to appear in Europhysics Letters | EPL 83, 30001 (2008) | 10.1209/0295-5075/83/30001 | null | cond-mat.soft cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate velocity probability distribution functions (PDF) of sheared
hard-sphere suspensions. As observed in our Stokes flow simulations and
explained by our single-particle theory, these PDFs can show pronounced
deviations from a Maxwell-Boltzmann distribution. The PDFs are symmetric around
zero velocity and show a Gaussian core and exponential tails over more than six
orders of magnitude of probability. Following the excellent agreement of our
theory and simulation data, we demonstrate that the distribution functions
scale with the shear rate, the particle volume concentration, as well as the
fluid viscosity.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 09:12:20 GMT"
},
{
"version": "v2",
"created": "Thu, 29 Nov 2007 08:43:41 GMT"
},
{
"version": "v3",
"created": "Tue, 24 Jun 2008 08:14:53 GMT"
}
] | 2008-07-24T00:00:00 | [
[
"Harting",
"Jens",
""
],
[
"Herrmann",
"Hans J.",
""
],
[
"Ben-Naim",
"Eli",
""
]
] |
0707.4357 | Gang Wu | Gang Wu, Jian Zhou, and Jinming Dong | Radial-breathing-like phonon modes of double-walled carbon nanotubes | null | PHYSICAL REVIEW B 72, 115418 (2005) | 10.1103/PhysRevB.72.115418 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | The radial-breathing-like phonon modes (RBLMs) of the double-walled carbon
nanotubes are studied in a simple analytical model, in which the interaction
force constants (FCs) can be obtained analytically from the continuous model.
The RBLMs frequencies are obtained by solving the dynamical matrix, and their
relationship with the tube radii can be obtained analytically, offering a
powerful experimental tool for determining precisely the radii of the
multi-walled carbon nanotubes.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 08:50:05 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Wu",
"Gang",
""
],
[
"Zhou",
"Jian",
""
],
[
"Dong",
"Jinming",
""
]
] |
0707.4358 | Toshiro Watanabe | Toshiro Watanabe | Exact Hausdorff measure on the boundary of a Galton--Watson tree | Published at http://dx.doi.org/10.1214/009117906000000629 in the
Annals of Probability (http://www.imstat.org/aop/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Probability 2007, Vol. 35, No. 3, 1007-1038 | 10.1214/009117906000000629 | IMS-AOP-AOP0182 | math.PR | null | A necessary and sufficient condition for the almost sure existence of an
absolutely continuous (with respect to the branching measure) exact Hausdorff
measure on the boundary of a Galton--Watson tree is obtained. In the case where
the absolutely continuous exact Hausdorff measure does not exist almost surely,
a criterion which classifies gauge functions $\phi$ according to whether
$\phi$-Hausdorff measure of the boundary minus a certain exceptional set is
zero or infinity is given. Important examples are discussed in four additional
theorems. In particular, Hawkes's conjecture in 1981 is solved. Problems of
determining the exact local dimension of the branching measure at a typical
point of the boundary are also solved.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 08:52:51 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Watanabe",
"Toshiro",
""
]
] |
0707.4359 | Stephen Sontz | Stephen Bruce Sontz | The $\mu$-deformed Segal-Bargmann transform is a Hall type transform | Minor errors corrected. Some more clarifications. Final version | Infinite Dimensional Analysis, Quantum Probability and Related
Topics, Vol. 12, Issue: 2 (June 2009) 269-289 | null | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an explanation of how the $\mu$-deformed Segal-Bargmann spaces,
that are studied in various articles of the author in collaboration with
Angulo, Echevarria and Pita, can be viewed as deserving their name, that is,
how they should be considered as a part of Segal-Bargmann analysis. This
explanation relates the $\mu$-deformed Segal-Bargmann transforms to the
generalized Segal-Bargmann transforms introduced by B. Hall using heat kernel
analysis. All the versions of the $\mu$-deformed Segal-Bargmann transform can
be understood as Hall type transforms. In particular, we define a
$\mu$-deformation of Hall's "Version C" generalized Segal-Bargmann transform
which is then shown to be a $\mu$-deformed convolution with a $\mu$-deformed
heat kernel followed by analytic continuation. Our results are generalizations
and analogues of the results of Hall.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 15:58:09 GMT"
},
{
"version": "v2",
"created": "Sat, 27 Sep 2008 20:09:56 GMT"
},
{
"version": "v3",
"created": "Mon, 13 Jul 2009 21:37:48 GMT"
}
] | 2009-07-14T00:00:00 | [
[
"Sontz",
"Stephen Bruce",
""
]
] |
0707.4360 | Vitaly Skachek | Mark F. Flanagan, Vitaly Skachek, Eimear Byrne, Marcus Greferath | Linear-programming Decoding of Non-binary Linear Codes | 6 pages, 1 figure, 7-th International ITG Conference on Source and
Channel Coding (SCC'08) | null | null | null | cs.IT math.IT | null | We develop a framework for linear-programming (LP) decoding of non-binary
linear codes over rings. We prove that the resulting LP decoder has the
`maximum likelihood certificate' property, and we show that the decoder output
is the lowest cost pseudocodeword. Equivalence between pseudocodewords of the
linear program and pseudocodewords of graph covers is proved. LP decoding
performance is illustrated for the (11,6,5) ternary Golay code with ternary PSK
modulation over AWGN, and in this case it is shown that the LP decoder
performance is comparable to codeword-error-rate-optimum hard-decision based
decoding.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 15:31:30 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Oct 2007 17:29:46 GMT"
}
] | 2007-10-10T00:00:00 | [
[
"Flanagan",
"Mark F.",
""
],
[
"Skachek",
"Vitaly",
""
],
[
"Byrne",
"Eimear",
""
],
[
"Greferath",
"Marcus",
""
]
] |
0707.4361 | Ariel Keselman | Jose Ariel Keselman and Adi Nusser | Halo Assembly Bias in the Quasi-linear Regime | 7 pages, 5 figures; Minor revision; Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12495.x | null | astro-ph | null | We address the question of whether or not assembly bias arises in the absence
of highly non-linear effects such as tidal stripping of halos near larger mass
concentrations. Therefore, we use a simplified dynamical scheme where these
effects are not modeled. We choose the punctuated Zel'dovich (PZ)
approximation, which prevents orbit mixing by coalescing particles coming
within a critical distance of each other. A numerical implementation of this
approximation is fast, allowing us to run a large number of simulations to
study assembly bias. We measure an assembly bias from 60 PZ simulations, each
with 512^3 cold particles in a 128h^-1 Mpc cubic box. The assembly bias
estimated from the correlation functions at separations < 5h^-1 Mpc for objects
(halos) at z=0 is comparable to that obtained in full N-body simulations. For
masses 4x10^11 h^-1 Mo the "oldest" 10% haloes are 3-5 times more correlated
than the "youngest" 10%. The bias weakens with increasing mass, also in
agreement with full N-body simulations. We find that that halo ages are
correlated with the dimensionality of the surrounding linear structures as
measured by the parameter (\lambda_1+\lambda_2+\lambda_3)/
(\lambda_1^2+\lambda_2^2+\lambda_3^2)^{1/2} where \lambda_i are proportional to
the eigenvalues of the velocity deformation tensor. Our results suggest that
assembly bias may already be encoded in the early stages of the evolution.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 09:44:14 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Sep 2007 08:24:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Keselman",
"Jose Ariel",
""
],
[
"Nusser",
"Adi",
""
]
] |
0707.4362 | Guillermo A. Mena Marugan | Pablo Galan, Luis J. Garay, Guillermo A. Mena Marugan | Quantum time uncertainty in Schwarzschild-anti-de Sitter black holes | 10 pages, version published in Physical Review D | Phys.Rev.D76:044014,2007 | 10.1103/PhysRevD.76.044014 | null | gr-qc | null | The combined action of gravity and quantum mechanics gives rise to a minimum
time uncertainty in the lowest order approximation of a perturbative scheme, in
which quantum effects are regarded as corrections to the classical spacetime
geometry. From the nonperturbative point of view, both gravity and quantum
mechanics are treated on equal footing in a description that already contains
all possible backreaction effects as those above in a nonlinear manner. In this
paper, the existence or not of such minimum time uncertainty is analyzed in the
context of Schwarzschild-anti-de Sitter black holes using the isolated horizon
formalism. We show that from a perturbative point of view, a nonzero time
uncertainty is generically present owing to the energy scale introduced by the
cosmological constant, while in a quantization scheme that includes
nonperturbatively the effects of that scale, an arbitrarily high time
resolution can be reached.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 09:28:22 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 10:31:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Galan",
"Pablo",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
]
] |
0707.4363 | Gang Wu | Gang Wu and Jinming Dong | Anomalous heat conduction in a carbon nanowire: Molecular dynamics
calculations | null | PHYSICAL REVIEW B 71, 115410 (2005) | 10.1103/PhysRevB.71.115410 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Heat conduction of a real quasi-one dimensional material, the finite length
carbon nanowire (CNW), inserted into the single-walled carbon nanotube (SWNT)
has been studied by the molecular dynamical (MD) method, in which both of the
longitudinal as well as transverse motions of the chain atoms in the SWNT have
been permitted. It is found that the thermal conductivity $\kappa $ of the
carbon nanowire is very high at room temperature, and diverges more likely with
the chain length logarithmically.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 09:31:09 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Wu",
"Gang",
""
],
[
"Dong",
"Jinming",
""
]
] |
0707.4364 | Fredrik Schoeier | F. L. Schoeier, D. Fong, J. H. Bieging, D. J. Wilner, K. Young, T. R.
Hunter | The distribution of H13CN in the circumstellar envelope around IRC+10216 | Accepted for publication in ApJ. 20 pages, 7 figures | null | 10.1086/522196 | null | astro-ph | null | H13CN J=8-7 sub-millimetre line emission produced in the circumstellar
envelope around the extreme carbon star IRC+10216 has been imaged at
sub-arcsecond angular resolution using the SMA. Supplemented by a detailed
excitation analysis the average fractional abundance of H13CN in the inner wind
(< 5E15 cm) is estimated to be about 4E-7, translating into a total HCN
fractional abundance of 2E-5 using the isotopic ratio 12C/13C=50.
Multi-transitional single-dish observations further requires the H13CN
fractional abundance to remain more or less constant in the envelope out to a
radius of about 4E16 cm, where the HCN molecules are effectively destroyed,
most probably, by photodissociation. The large amount of HCN present in the
inner wind provides effective line cooling that can dominate over that
generated from CO line emission. It is also shown that great care needs to be
taken in the radiative transfer modelling where non-local, and non-LTE, effects
are important and where the radiation field from thermal dust grains plays a
major role in exciting the HCN molecules. The amount of HCN present in the
circumstellar envelope around IRC+10216 is consistent with predicted
photospheric values based on equilibrium chemical models and indicates that any
non-equilibrium chemistry occurring in the extended pulsating atmosphere has no
drastic net effect on the fractional abundance of HCN molecules that enters the
outer envelope. It further suggests that few HCN molecules are incorporated
into dust grains.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 09:38:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schoeier",
"F. L.",
""
],
[
"Fong",
"D.",
""
],
[
"Bieging",
"J. H.",
""
],
[
"Wilner",
"D. J.",
""
],
[
"Young",
"K.",
""
],
[
"Hunter",
"T. R.",
""
]
] |
0707.4365 | Iliya Iliev D. | Sevdzhan Hakkaev, Iliya D. Iliev and Kiril Kirchev | Stability of periodic travelling shallow-water waves determined by
Newton's equation | 35 pages, no figures | null | 10.1088/1751-8113/41/8/085203 | null | nlin.SI | null | We study the existence and stability of periodic travelling-wave solutions
for generalized Benjamin-Bona-Mahony and Camassa-Holm equations. To prove
stability, we use the abstract results of Grillakis-Shatah-Strauss and the
Floquet theory for periodic eigenvalue problems.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 09:39:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hakkaev",
"Sevdzhan",
""
],
[
"Iliev",
"Iliya D.",
""
],
[
"Kirchev",
"Kiril",
""
]
] |
0707.4366 | Christian Jansson | Christian Jansson | Guaranteed Accuracy for Conic Programming Problems in Vector Lattices | null | null | null | null | math.OC math.FA | null | This paper presents rigorous forward error bounds for linear conic
optimization problems. The error bounds are formulated in a quite general
framework; the underlying vector spaces are not required to be
finite-dimensional, and the convex cones defining the partial ordering are not
required to be polyhedral. In the case of linear programming, second order cone
programming, and semidefinite programming specialized formulas are deduced
yielding guaranteed accuracy. All computed bounds are completely rigorous
because all rounding errors due to floating point arithmetic are taken into
account. Numerical results, applications and software for linear and
semidefinite programming problems are described.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 09:53:37 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Jansson",
"Christian",
""
]
] |
0707.4367 | Zohar Komargodski | Zohar Komargodski, Shlomo S. Razamat | Planar quark scattering at strong coupling and universality | 13 pages, 4 figures, JHEP format. v2: added references and minor
corrections. v3: following arXiv:0710.0393 we change our claim about a
minimal surface solution without spike singularities. We make the appropriate
corrections where necessary | JHEP 0801:044,2008 | 10.1088/1126-6708/2008/01/044 | WIS/11/07-JUL-DPP | hep-th | null | We discuss scattering of fundamental matter in the planar and strong coupling
limit via the AdS/CFT correspondence, generalizing the recently proposed
calculation for adjoint matter due to Alday and Maldacena [arXiv:0705.0303].
Color decomposition of quark amplitudes is a key property allowing to repeat
the procedure in the case of fundamental matter and to derive the relation of
these strong coupling amplitudes to minimal area problems. We present the
results for two different D3-D7 systems, one is only conformal in the planar
limit and the other is exactly conformal. Our results suggest a universal
behavior of scattering amplitudes at strong coupling and planar limit (both for
gluons and quarks).
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 18:40:23 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Sep 2007 20:10:23 GMT"
},
{
"version": "v3",
"created": "Wed, 5 Dec 2007 16:23:24 GMT"
}
] | 2010-02-03T00:00:00 | [
[
"Komargodski",
"Zohar",
""
],
[
"Razamat",
"Shlomo S.",
""
]
] |
0707.4368 | Johannes Bauer | J Bauer, A Oguri, AC Hewson | Spectral properties of locally correlated electrons in a BCS
superconductor | 22 pages, 12 figures | J. Phys.: Cond. Mat. 19 (2007), 486211 | 10.1088/0953-8984/19/48/486211 | null | cond-mat.str-el cond-mat.supr-con | null | We present a detailed study of the spectral properties of a locally
correlated site embedded in a BCS superconducting medium. To this end the
Anderson impurity model with superconducting bath is analysed by numerical
renormalisation group (NRG) calculations. We calculate one and two-particle
dynamic response function to elucidate the spectral excitation and the nature
of the ground state for different parameter regimes with and without
particle-hole symmetry. The position and weight of the Andreev bound states is
given for all relevant parameters. We also present phase diagrams for the
different ground state parameter regimes. This work is also relevant for
dynamical mean field theory extensions with superconducting symmetry breaking.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 10:02:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bauer",
"J",
""
],
[
"Oguri",
"A",
""
],
[
"Hewson",
"AC",
""
]
] |
0707.4369 | Maria Concetta Maccarone | G.Agnetta (IASF-Palermo/INAF, Italy), P. Assis (LIP-Lisbon, Portugal),
B. Biondo (IASF-Palermo/INAF, Italy), P. Brogueira (LIP-Lisbon, Portugal), A.
Cappa (IFSI-Torino/INAF & INFN-Torino, Italy), O. Catalano (IASF-Palermo/INAF
& INFN-Catania, Italy), J. Chauvin (LPSC-Grenoble, France), G. D'Ali' Staiti
(IASF-Palermo/INAF & DiFTeR/Univ.Palermo & INFN-Catania, Italy), M. Dattoli
(IFSI-Torino/INAF & INFN-Torino & Univ.Torino, Italy), M.C. Espirito-Santo
(LIP-Lisbon, Portugal), L. Fava (INFN-Torino & Univ.Torino, Italy), P.
Galeotti (INFN-Torino & Univ.Torino, Italy), S. Giarrusso (IASF-Palermo/INAF
& INFN-Catania, Italy), G. Gugliotta (IASF-Palermo/INAF & INFN-Catania,
Italy), G. La Rosa (IASF-Palermo/INAF & INFN-Catania, Italy), D. Lebrun
(LPSC-Grenoble, France), M.C. Maccarone (IASF-Palermo/INAF & INFN-Catania,
Italy), A. Mangano (IASF-Palermo/INAF & INFN-Catania, Italy), L. Melo
(LIP-Lisbon, Portugal), S. Moreggia (LPSC-Grenoble, France), M. Pimenta
(LIP-Lisbon, Portugal), F. Russo (IASF-Palermo/INAF, Italy), O. Saavedra
(INFN-Torino & Univ.Torino, Italy), A. Segreto (IASF-Palermo/INAF &
INFN-Catania, Italy), J.C. Silva (LIP-Lisbon, Portugal), P. Stassi
(LPSC-Grenoble, France), B. Tome' (LIP-Lisbon, Portugal), P. Vallania
(IFSI-Torino/INAF & INFN-Torino, Italy), C. Vigorito (INFN-Torino &
Univ.Torino, Italy) | Detection of the Cherenkov light diffused by Sea Water with the ULTRA
Experiment | 4 pages, 3 figures, PDF format, Proceedings of 30th ICRC,
International Cosmic Ray Conference 2007, Merida, Yucatan, Mexico, 3-11 July
2007 | null | null | null | astro-ph | null | The study of Ultra High Energy Cosmic Rays represents one of the most
challenging topic in the Cosmic Rays and in the Astroparticle Physics fields.
The interaction of primary particles with atmospheric nuclei produces a huge
Extensive Air Shower together with isotropic emission of UV fluorescence light
and highly directional Cherenkov photons, that are reflected/diffused
isotropically by the impact on the Earth's surface or on high optical depth
clouds. For space-based observations, detecting the reflected Cherenkov signal
in a delayed coincidence with the fluorescence light improves the accuracy of
the shower reconstruction in space and in particular the measurement of the
shower maximum, giving a strong signature for discriminating hadrons and
neutrinos, and helping to estimate the primary chemical composition. Since the
Earth's surface is mostly covered by water, the ULTRA (UV Light Transmission
and Reflection in the Atmosphere)experiment has been designed to provide the
diffusing properties of sea water, overcoming the lack of information in this
specific field. A small EAS array, made up of 5 particle detectors, and an UV
optical device, have been coupled to detect in coincidence both electromagnetic
and UV components. The detector was in operation from May to December, 2005, in
a small private harbor in Capo Granitola (Italy); the results of these
measurements in terms of diffusion coefficient and threshold energy are
presented here.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 10:03:54 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Agnetta",
"G.",
"",
"IASF-Palermo/INAF, Italy"
],
[
"Assis",
"P.",
"",
"LIP-Lisbon, Portugal"
],
[
"Biondo",
"B.",
"",
"IASF-Palermo/INAF, Italy"
],
[
"Brogueira",
"P.",
"",
"LIP-Lisbon, Portugal"
],
[
"Cappa",
"A.",
"",
"IFSI-Torino/INAF & INFN-Torino, Italy"
],
[
"Catalano",
"O.",
"",
"IASF-Palermo/INAF\n & INFN-Catania, Italy"
],
[
"Chauvin",
"J.",
"",
"LPSC-Grenoble, France"
],
[
"Staiti",
"G. D'Ali'",
"",
"IASF-Palermo/INAF & DiFTeR/Univ.Palermo & INFN-Catania, Italy"
],
[
"Dattoli",
"M.",
"",
"IFSI-Torino/INAF & INFN-Torino & Univ.Torino, Italy"
],
[
"Espirito-Santo",
"M. C.",
"",
"LIP-Lisbon, Portugal"
],
[
"Fava",
"L.",
"",
"INFN-Torino & Univ.Torino, Italy"
],
[
"Galeotti",
"P.",
"",
"INFN-Torino & Univ.Torino, Italy"
],
[
"Giarrusso",
"S.",
"",
"IASF-Palermo/INAF\n & INFN-Catania, Italy"
],
[
"Gugliotta",
"G.",
"",
"IASF-Palermo/INAF & INFN-Catania,\n Italy"
],
[
"La Rosa",
"G.",
"",
"IASF-Palermo/INAF & INFN-Catania, Italy"
],
[
"Lebrun",
"D.",
"",
"LPSC-Grenoble, France"
],
[
"Maccarone",
"M. C.",
"",
"IASF-Palermo/INAF & INFN-Catania,\n Italy"
],
[
"Mangano",
"A.",
"",
"IASF-Palermo/INAF & INFN-Catania, Italy"
],
[
"Melo",
"L.",
"",
"LIP-Lisbon, Portugal"
],
[
"Moreggia",
"S.",
"",
"LPSC-Grenoble, France"
],
[
"Pimenta",
"M.",
"",
"LIP-Lisbon, Portugal"
],
[
"Russo",
"F.",
"",
"IASF-Palermo/INAF, Italy"
],
[
"Saavedra",
"O.",
"",
"INFN-Torino & Univ.Torino, Italy"
],
[
"Segreto",
"A.",
"",
"IASF-Palermo/INAF &\n INFN-Catania, Italy"
],
[
"Silva",
"J. C.",
"",
"LIP-Lisbon, Portugal"
],
[
"Stassi",
"P.",
"",
"LPSC-Grenoble, France"
],
[
"Tome'",
"B.",
"",
"LIP-Lisbon, Portugal"
],
[
"Vallania",
"P.",
"",
"IFSI-Torino/INAF & INFN-Torino, Italy"
],
[
"Vigorito",
"C.",
"",
"INFN-Torino &\n Univ.Torino, Italy"
]
] |
0707.4370 | Paolo Salucci | Paolo Salucci | The mass distribution in Spiral galaxies | 10 pages, Invited review for IAU Symposium 244, Dark Galaxies & Lost
Baryons. Typos corrected. Comments are welcome | null | 10.1017/S174392130701383X | null | astro-ph gr-qc hep-ph | null | In the past years a wealth of observations has allowed us to unravel the
structural properties of the Dark and Luminous mass distribution in spirals. As
result, it has been found that their rotation curves follow, out their virial
radius, an Universal function (URC) made by two terms: one due to the
gravitational potential of a Freeman stellar disk and the other due to that of
a dark halo. The importance of the latter is found to decrease with galaxy
mass. Individual objects reveal in detail that dark halos have a density core,
whose size correlates with its central value. These properties will guide
$\Lambda$CDM Cosmology to evolve to match the challenge that observations
presently pose.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 10:26:53 GMT"
},
{
"version": "v2",
"created": "Tue, 28 Aug 2007 10:51:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Salucci",
"Paolo",
""
]
] |
0707.4371 | Miguel Hidalgo | M. A. Hidalgo R. Cangas | A model for the study of the Shubnikov-de Haas and the integer quantum
Hall effects in a two dimensional electronic system | 11 pages and 2 figures | null | null | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Up to know all the experimental results concerning the integer and fractional
quantum Hall effect are related to semiconductor heterostructures (and more
recently with graphene). The common characteristic of all these systems is the
presence of a reservoir of electrons, which, in fact, in the initial stage is
the source of the electrons, providing the two-dimensional electron gas (2DES).
Then, any physical realization of a 2DES is necessarily embedded in a 3D
structure, which establishes the Fermi level. Hence, the 2DES appears to be an
open system. In this paper we present an analytical approach to the integer
quantum Hall effect (IQHE) and the Shubnikov-de Haas (SdH) phenomena in the
2DES, basing us in fundamental principles and showing the secondary role of the
localized electron states in both phenomena. In fact, we show that the IQHE is
a consequence of the fluctuations of electrons in the 2DES. Once we obtain the
density of states of the 2DES under the application of a magnetic field we
calculate both magnetoconductivities (diagonal and Hall) deducing them from the
Boltzman semiclassical equation. The model proposed reproduces both phenomena,
the width of the Hall plateaus (with the precision reached in the experimental
measurements, of the order of 10-8-10-9) and the corresponding minima of the
diagonal magnetoresistivity, and also the dependence with temperature of the
IQHE and SdH.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 10:30:52 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Cangas",
"M. A. Hidalgo R.",
""
]
] |
0707.4372 | Jean Mairesse | Bruno Gaujal (LIP), Stefan Haar (IRISA), Jean Mairesse (LIAFA) | Blocking a transition in a Free Choice net and what it tells about its
throughput | null | Journal of Computer and System Sciences 66, 3 (2003) 515-548 | 10.1016/S0022-0000(03)00039-4 | null | cs.OH | null | In a live and bounded Free Choice Petri net, pick a non-conflicting
transition. Then there exists a unique reachable marking in which no transition
is enabled except the selected one. For a routed live and bounded Free Choice
net, this property is true for any transition of the net. Consider now a live
and bounded stochastic routed Free Choice net, and assume that the routings and
the firing times are independent and identically distributed. Using the above
results, we prove the existence of asymptotic firing throughputs for all
transitions in the net. Furthermore the vector of the throughputs at the
different transitions is explicitly computable up to a multiplicative constant.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 10:46:07 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Gaujal",
"Bruno",
"",
"LIP"
],
[
"Haar",
"Stefan",
"",
"IRISA"
],
[
"Mairesse",
"Jean",
"",
"LIAFA"
]
] |
0707.4373 | Sylvain Crovisier | Fran\c{c}ois B\'eguin (LM-Orsay), Sylvain Crovisier (LAGA), Tobias
Jaeger (CDF), Fr\'ed\'eric Le Roux (LM-Orsay) | Denjoy constructions for fibred homeomorphisms of the torus | null | null | null | null | math.DS | null | We construct different types of quasiperiodically forced circle
homeomorphisms with transitive but non-minimal dynamics. Concerning the recent
Poincar\'e-like classification for this class of maps of Jaeger-Stark, we
demonstrate that transitive but non-minimal behaviour can occur in each of the
different cases. This closes one of the last gaps in the topological
classification. Actually, we are able to get some transitive quasiperiodically
forced circle homeomorphisms with rather complicated minimal sets. For example,
we show that, in some of the examples we construct, the unique minimal set is a
Cantor set and its intersection with each vertical fibre is uncountable and
nowhere dense (but may contain isolated points). We also prove that minimal
sets of the later kind cannot occur when the dynamics are given by the
projective action of a quasiperiodic SL(2,R)-cocycle. More precisely, we show
that, for a quasiperiodic SL(2,R)-cocycle, any minimal strict subset of the
torus either is a union of finitely many continuous curves, or contains at most
two points on generic fibres.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 10:52:45 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Béguin",
"François",
"",
"LM-Orsay"
],
[
"Crovisier",
"Sylvain",
"",
"LAGA"
],
[
"Jaeger",
"Tobias",
"",
"CDF"
],
[
"Roux",
"Frédéric Le",
"",
"LM-Orsay"
]
] |
0707.4374 | Elmo Tempel | Elmo Tempel, Antti Tamm and Peeter Tenjes | Visible and dark matter in M 31 - II. A dynamical model and dark matter
density distribution | 12 pages, 13 figures | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we derive the density distribution of dark matter (DM)
in a well-observed nearby disc galaxy, the Andromeda galaxy. From photometrical
and chemical evolution models constructed in the first part of the study (Tamm,
Tempel & Tenjes 2007 (arXiv:0707.4375), hereafter Paper I) we can calculate the
mass distribution of visible components (the bulge, the disc, the stellar halo,
the outer diffuse stellar halo). In the dynamical model we calculate stellar
rotation velocities along the major axis and velocity dispersions along the
major, minor and intermediate axes of the galaxy assuming triaxial velocity
dispersion ellipsoid. Comparing the calculated values with the collected
observational data, we find the amount of DM, which must be added to reach an
agreement with the observed rotation and dispersion data.
We conclude that within the uncertainties, the DM distributions by Moore,
Burkert, Navarro, Frenk & White (NFW) and the Einasto fit with observations
nearly at all distances. The NFW and Einasto density distributions give the
best fit with observations.
The total mass of M 31 with the NFW DM distribution is 1.19*10^12 M_sun, the
ratio of the DM mass to the visible mass is 10.0. For the Einasto DM
distribution, these values are 1.28*10^12 M_sun and 10.8. The ratio of the DM
mass to the visible mass inside the Holmberg radius is 1.75 for the NFW and the
Einasto distributions. For different cuspy DM distributions, the virial mass is
in a range 6.9-7.9*10^11 M_sun and the virial radius is ~150 kpc. The DM mean
densities inside 10 pc for cusped models are 33 and 16 M_sun pc^-3 for the NFW
and the Einasto profiles, respectively. For the cored Burkert profile, this
value is 0.06 M_sun pc^-3.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 11:10:55 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Sep 2008 10:12:52 GMT"
}
] | 2008-09-02T00:00:00 | [
[
"Tempel",
"Elmo",
""
],
[
"Tamm",
"Antti",
""
],
[
"Tenjes",
"Peeter",
""
]
] |
0707.4375 | Antti Tamm | Antti Tamm, Elmo Tempel, Peeter Tenjes | Visible and dark matter in M31 - I. Properties of stellar components | 11 pages, 8 figures | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a structural model of the Andromeda Galaxy, simultaneously
corresponding to observed photometrical and kinematical data and chemical
abundances. In this paper we present the observed surface brightness, colour
and metallicity distributions, and compare them to the model galaxy. In Paper
II (Tempel, Tamm & Tenjes 2007) we present similar data for the kinematics, and
derive the mass distribution of the galaxy. On the basis of U, B, V, R, I and L
luminosity distributions, we construct the model galaxy as a superposition of
four axially symmetric stellar components: a bulge, a disc, an inner halo and
an extended diffuse halo. By using far-infrared imaging data of M31 and a thin
dust disc assumption, we derive dust-free surface brightness and colour
distributions. We find the total absorption corrected luminosity of M31 to be
L_B = (3.3+/-0.7)x10^10 L_sun, corresponding to an absolute luminosity M_B =
-20.8+/-0.2 mag. Of the total luminosity, 41% (0.57 mag) is obscured from us by
the dust inside M31. Using chemical evolution models, we calculate
mass-to-light ratios of the components, correspoding to the colour indices and
metallicities. We find the total intrinsic mass-to-light ratio of the visible
matter to be M/L_B=3.1-5.8 M_sun/L_sun and the total mass of visible matter
M_vis =(10-19)x10^10 M_sun. The use of the model parameters for a dynamical
analysis and for determining dark matter distribution is presented in Paper II.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 11:49:40 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Sep 2008 08:16:31 GMT"
},
{
"version": "v3",
"created": "Fri, 5 Sep 2008 05:28:36 GMT"
}
] | 2008-09-05T00:00:00 | [
[
"Tamm",
"Antti",
""
],
[
"Tempel",
"Elmo",
""
],
[
"Tenjes",
"Peeter",
""
]
] |
0707.4376 | Gang Wu | Gang Wu and Jinming Dong | Characteristics of the Wave Function of Coupled Oscillators in
Semiquantum Chaos | null | Physics Letters A 300, 199 (2002) | 10.1016/S0375-9601(02)00756-9 | null | nlin.CD | null | Using the method of adiabatic invariants and the Born-Oppenheimer
approximation, we have successfully got the excited-state wave functions for a
pair of coupled oscillators in the so-called \textit{semiquantum chaos}. Some
interesting characteristics in the \textit{Fourier spectra} of the wave
functions and its \textit{Correlation Functions} in the regular and chaos
states have been found, which offers a new way to distinguish the regular and
chaotic states in quantum system.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 11:01:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wu",
"Gang",
""
],
[
"Dong",
"Jinming",
""
]
] |
0707.4377 | Gustau Catalan | G. Catalan, H. Bea, S. Fusil, M. Bibes, P. Paruch, A. Barthelemy, and
J. F. Scott | Fractal dimension and size scaling of domains in thin films of
multiferroic BiFeO3 | 4 pages, 3 figures | null | 10.1103/PhysRevLett.100.027602 | null | cond-mat.mtrl-sci | null | We have analyzed the morphology of ferroelectric domains in very thin films
of multiferroic BiFeO3. Unlike the more common stripe domains observed in
thicker films BiFeO3 or in other ferroics, the domains tend not to be straight,
but irregular in shape, with significant domain wall roughening leading to a
fractal dimensionality. Also contrary to what is usually observed in other
ferroics, the domain size appears not to scale as the square root of the film
thickness. A model is proposed in which the observed domain size as a function
of film thickness can be directly linked to the fractal dimension of the
domains.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 11:41:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Catalan",
"G.",
""
],
[
"Bea",
"H.",
""
],
[
"Fusil",
"S.",
""
],
[
"Bibes",
"M.",
""
],
[
"Paruch",
"P.",
""
],
[
"Barthelemy",
"A.",
""
],
[
"Scott",
"J. F.",
""
]
] |
0707.4378 | Ferdinand Evers | F. Evers and A.D. Mirlin | Anderson Transitions | 63 pages, 39 figures, submitted to Rev. Mod. Phys | Rev. Mod. Phys. 80, 1355 (2008) | 10.1103/RevModPhys.80.1355 | null | cond-mat.mes-hall cond-mat.dis-nn | null | The physics of Anderson transitions between localized and metallic phases in
disordered systems is reviewed. The term ``Anderson transition'' is understood
in a broad sense, including both metal-insulator transitions and
quantum-Hall-type transitions between phases with localized states. The
emphasis is put on recent developments, which include: multifractality of
critical wave functions, criticality in the power-law random banded matrix
model, symmetry classification of disordered electronic systems, mechanisms of
criticality in quasi-one-dimensional and two-dimensional systems and survey of
corresponding critical theories, network models, and random Dirac Hamiltonians.
Analytical approaches are complemented by advanced numerical simulations.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 11:21:08 GMT"
}
] | 2008-10-20T00:00:00 | [
[
"Evers",
"F.",
""
],
[
"Mirlin",
"A. D.",
""
]
] |
0707.4379 | Munir Al-Hashimi | M. H. Al-Hashimi and U.-J. Wiese | Runge-Lenz Vector, Accidental SU(2) Symmetry, and Unusual Multiplets for
Motion on a Cone | 26 pages, 7 figures | Annals of Physics 323 (2008) 82-104 | 10.1016/j.aop.2007.08.004 | null | quant-ph hep-th math-ph math.MP | null | We consider a particle moving on a cone and bound to its tip by $1/r$ or
harmonic oscillator potentials. When the deficit angle of the cone divided by
$2 \pi$ is a rational number, all bound classical orbits are closed.
Correspondingly, the quantum system has accidental degeneracies in the discrete
energy spectrum. An accidental SU(2) symmetry is generated by the rotations
around the tip of the cone as well as by a Runge-Lenz vector. Remarkably, some
of the corresponding multiplets have fractional ``spin'' and unusual
degeneracies.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 11:28:59 GMT"
}
] | 2013-06-04T00:00:00 | [
[
"Al-Hashimi",
"M. H.",
""
],
[
"Wiese",
"U. -J.",
""
]
] |
0707.4380 | Bozek | Vittorio Soma and Piotr Bozek | Nuclear matter with three-body forces from self-consistent spectral
calculations | null | ActaPhys.Polon.B39:1405-1412,2008 | null | null | nucl-th | null | We calculate the equation of state of nuclear matter in the self-consistent
T-matrix scheme including three-body nuclear interactions. We study the effect
of the three-body force on the self-energies and spectral functions of nucleons
in medium.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 11:29:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Soma",
"Vittorio",
""
],
[
"Bozek",
"Piotr",
""
]
] |
0707.4381 | Enrico Ramirez-Ruiz | Enrico Ramirez-Ruiz, Ken-Ichi Nishikawa, Christian B. Hededal | Electron-Positron Pair Loading and the Origin of the Upstream Magnetic
Field in GRB Shocks | ApJ in press, 13 pages, 9 figs | null | 10.1086/522072 | null | astro-ph | null | We investigate here the effects of plasma instabilities driven by rapid
electron/positron pair cascades, which arise in the environment of GRB sources
as a result of back-scattering of a seed fraction of the original spectrum. The
injection of electron/positron pairs induces strong streaming motions in the
ambient medium. One therefore expects the pair-enriched medium ahead of the
forward shock to be strongly sheared on length scales comparable to the
radiation front thickness. Using three-dimensional particle-in-cell
simulations, we show that plasma instabilities driven by these streaming
electron/positron pairs are responsible for the excitation of
near-equipartition, turbulent magnetic fields. Our results reveal the
importance of the electromagnetic filamentation instability in ensuring an
effective coupling between electron/positron pairs and ions, and may help
explain the origin of large upstream fields in GRB shocks.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 11:34:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ramirez-Ruiz",
"Enrico",
""
],
[
"Nishikawa",
"Ken-Ichi",
""
],
[
"Hededal",
"Christian B.",
""
]
] |
0707.4382 | Matteo Petrera | Matteo Petrera, Yuri B. Suris | On the Hamiltonian structure of Hirota-Kimura discretization of the
Euler top | 11 pages | null | null | null | math-ph math.MP nlin.SI | null | This paper deals with a remarkable integrable discretization of the so(3)
Euler top introduced by Hirota and Kimura. Such a discretization leads to an
explicit map, whose integrability has been understood by finding two
independent integrals of motion and a solution in terms of elliptic functions.
Our goal is the construction of its Hamiltonian formulation. After giving a
simplified and streamlined presentation of their results, we provide a
bi-Hamiltonian structure for this discretization, thus proving its
integrability in the standard Liouville-Arnold sense.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 11:34:16 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Petrera",
"Matteo",
""
],
[
"Suris",
"Yuri B.",
""
]
] |
0707.4383 | Tomasz Polak T.P. | T. P. Polak and T. K. Kope\'c | Quantum rotor description of the Mott-insulator transition in the
Bose-Hubbard model | accepted to PRB | null | 10.1103/PhysRevB.76.094503 | null | cond-mat.stat-mech | null | We present the novel approach to the Bose-Hubbard model using the
$\mathrm{U}(1)$ quantum rotor description. The effective action formalism
allows us to formulate a problem in the phase only action and obtain an
analytical formulas for the critical lines. We show that the nontrivial
$\mathrm{U}(1)$ phase field configurations have an impact on the phase
diagrams. The topological character of the quantum field is governed by terms
of the integer charges - winding numbers. The comparison presented results to
recently obtained quantum Monte Carlo numerical calculations suggests that the
competition between quantum effects in strongly interacting boson systems is
correctly captured by our model.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:31:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Polak",
"T. P.",
""
],
[
"Kopeć",
"T. K.",
""
]
] |
0707.4384 | Thorsten Bogner | Thorsten Bogner | Density Matrix Renormalization for Model Reduction in Nonlinear Dynamics | 12 pages, 12 figures | null | 10.1103/PhysRevE.76.056707 | null | physics.comp-ph physics.flu-dyn | null | We present a novel approach for model reduction of nonlinear dynamical
systems based on proper orthogonal decomposition (POD). Our method, derived
from Density Matrix Renormalization Group (DMRG), provides a significant
reduction in computational effort for the calculation of the reduced system,
compared to a POD. The efficiency of the algorithm is tested on the one
dimensional Burgers equations and a one dimensional equation of the Fisher type
as nonlinear model systems.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 11:55:48 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Aug 2007 15:59:05 GMT"
},
{
"version": "v3",
"created": "Wed, 29 Aug 2007 15:43:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bogner",
"Thorsten",
""
]
] |
0707.4385 | Semyon Alesker | Semyon Alesker | Plurisubharmonic functions on the octonionic plane and Spin(9)-invariant
valuations on convex sets | 35 pages. The definition of octonionic Hessian is replaced with the
transposed matrix as it should be. Other minor corrections | J. Geom. Anal. 18 (2008), no. 3, 651--686 | null | null | math.MG math.CV | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new class of plurisubharmonic functions on the octonionic plane O^2= R^{16}
is introduced. An octonionic version of theorems of A.D. Aleksandrov and Chern-
Levine-Nirenberg, and Blocki are proved. These results are used to construct
new examples of continuous translation invariant valuations on convex subsets
of O^2=R^{16}. In particular a new example of Spin(9)-invariant valuation on
R^{16} is given.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:07:15 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Oct 2007 12:33:02 GMT"
},
{
"version": "v3",
"created": "Wed, 12 Mar 2008 11:58:36 GMT"
},
{
"version": "v4",
"created": "Tue, 26 Jul 2016 11:04:29 GMT"
}
] | 2016-07-27T00:00:00 | [
[
"Alesker",
"Semyon",
""
]
] |
0707.4386 | Juergen Jost | Qun Chen, Juergen Jost and Guofang Wang | Nonlinear Dirac equations on Riemann surfaces | to appear in Annals of Global Analysis and Geometry | null | null | null | math.DG math.AP | null | We develop analytical methods for nonlinear Dirac equations. Examples of such
equations include Dirac-harmonic maps with curvature term and the equations
describing the generalized Weierstrass representation of surfaces in
three-manifolds. We provide the key analytical steps, i.e., small energy
regularity and removable singularity theorems and energy identities for
solutions.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:04:31 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Chen",
"Qun",
""
],
[
"Jost",
"Juergen",
""
],
[
"Wang",
"Guofang",
""
]
] |
0707.4387 | A. Popier | A. Popier | Backward stochastic differential equations with random stopping time and
singular final condition | Published at http://dx.doi.org/10.1214/009117906000000746 in the
Annals of Probability (http://www.imstat.org/aop/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Probability 2007, Vol. 35, No. 3, 1071-1117 | 10.1214/009117906000000746 | IMS-AOP-AOP0199 | math.PR | null | In this paper we are concerned with one-dimensional backward stochastic
differential equations (BSDE in short) of the following type: \[Y_t=\xi
-\int_{t\wedge \tau}^{\tau}Y_r|Y_r|^q dr-\int_{t\wedge \tau}^{\tau}Z_r
dB_r,\qquad t\geq 0,\] where $\tau$ is a stopping time, $q$ is a positive
constant and $\xi$ is a $\mathcal{F}_{\tau}$-measurable random variable such
that $\mathbf{P}(\xi =+\infty)>0$. We study the link between these BSDE and the
Dirichlet problem on a domain $D\subset \mathbb{R}^d$ and with boundary
condition $g$, with $g=+\infty$ on a set of positive Lebesgue measure. We also
extend our results for more general BSDE.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:06:09 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Popier",
"A.",
""
]
] |
0707.4388 | St\'ephane Grenier | S. Grenier, K. J. Thomas, J. P. Hill, U. Staub, Y. Bodenthin, M.
Garc\'ia-Fern\'andez, V. Scagnoli, V. Kiryukhin, S-W. Cheong, B. G. Kim, J.
M. Tonnerre | Direct observation of oxygen superstructures in manganites | 5 pages | null | 10.1103/PhysRevLett.99.206403 | null | cond-mat.str-el | null | We report the observation of superstructures associated with the oxygen
2p-states in two prototypical manganites using x-ray diffraction at the oxygen
K-edge. We determine the nature of the orderings and discuss our picture with
respect to novel theoretical models. In the stripe order system Bi0.31 Ca0.69
MnO3, hole-doped O states are found to be orbitally ordered, at the same
propagation vector as the Mn orbital ordering, but no evidence is found to
support a picture of oxygen charge stripes at this periodicity. In La 7/8 Sr
1/8 MnO3, we observe a 2p charge ordering described by alternating hole-poor
and hole-rich MnO planes that is consistent with recent predictions.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:29:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Grenier",
"S.",
""
],
[
"Thomas",
"K. J.",
""
],
[
"Hill",
"J. P.",
""
],
[
"Staub",
"U.",
""
],
[
"Bodenthin",
"Y.",
""
],
[
"García-Fernández",
"M.",
""
],
[
"Scagnoli",
"V.",
""
],
[
"Kiryukhin",
"V.",
""
],
[
"Cheong",
"S-W.",
""
],
[
"Kim",
"B. G.",
""
],
[
"Tonnerre",
"J. M.",
""
]
] |
0707.4389 | Sandrine Blazy | Andrew W. Appel (INRIA Rocquencourt), Sandrine Blazy (CEDRIC, INRIA
Rocquencourt) | Separation Logic for Small-step Cminor | Version courte du rapport de recherche RR-6138 | Dans 20th Int. Conference on Theorem Proving in Higher Order
Logics (TPHOLs 2007) 4732 (2007) 5-21 | null | null | cs.PL | null | Cminor is a mid-level imperative programming language; there are
proved-correct optimizing compilers from C to Cminor and from Cminor to machine
language. We have redesigned Cminor so that it is suitable for Hoare Logic
reasoning and we have designed a Separation Logic for Cminor. In this paper, we
give a small-step semantics (instead of the big-step of the proved-correct
compiler) that is motivated by the need to support future concurrent
extensions. We detail a machine-checked proof of soundness of our Separation
Logic. This is the first large-scale machine-checked proof of a Separation
Logic w.r.t. a small-step semantics. The work presented in this paper has been
carried out in the Coq proof assistant. It is a first step towards an
environment in which concurrent Cminor programs can be verified using
Separation Logic and also compiled by a proved-correct compiler with formal
end-to-end correctness guarantees.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:09:16 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Appel",
"Andrew W.",
"",
"INRIA Rocquencourt"
],
[
"Blazy",
"Sandrine",
"",
"CEDRIC, INRIA\n Rocquencourt"
]
] |
0707.4390 | Galina L. Klimchitskaya | F. Chen, G. L. Klimchitskaya, V. M. Mostepanenko, and U. Mohideen | Control of the Casimir force by the modification of dielectric
properties with light | 30 pages, 10 figures, 2 tables | Phys. Rev. B, v.76, N3, 035338-(1-15), 2007 | 10.1103/PhysRevB.76.035338 | null | cond-mat.stat-mech quant-ph | null | The experimental demonstration of the modification of the Casimir force
between a gold coated sphere and a single-crystal Si membrane by light pulses
is performed. The specially designed and fabricated Si membrane was irradiated
with 514 nm laser pulses of 5 ms width in high vacuum leading to a change of
the charge-carrier density. The difference in the Casimir force in the presence
and in the absence of laser radiation was measured by means of an atomic force
microscope as a function of separation at different powers of the absorbed
light. The total experimental error of the measured force differences at a
separation of 100 nm varies from 10 to 20% in different measurements. The
experimental results are compared with theoretical computations using the
Lifshitz theory at both zero and laboratory temperatures. The total theoretical
error determined mostly by the uncertainty in the concentration of charge
carriers when the light is incident is found to be about 14% at separations
less than 140 nm. The experimental data are consistent with the Lifshitz theory
at laboratory temperature, if the static dielectric permittivity of
high-resistivity Si in the absence of light is assumed to be finite. If the dc
conductivity of high-resistivity Si in the absence of light is included into
the model of dielectric response, the Lifshitz theory at nonzero temperature is
shown to be experimentally inconsistent at 95% confidence. The demonstrated
phenomenon of the modification of the Casimir force through a change of the
charge-carrier density is topical for applications of the Lifshitz theory to
real materials in fields ranging from nanotechnology and condensed matter
physics to the theory of fundamental interactions.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:30:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chen",
"F.",
""
],
[
"Klimchitskaya",
"G. L.",
""
],
[
"Mostepanenko",
"V. M.",
""
],
[
"Mohideen",
"U.",
""
]
] |
0707.4391 | Chun Lin Tian | C.L. Tian, K. Xu, K.L. Chan, L.C. Deng | A three-dimensional multidimensional gas-kinetic scheme for the
Navier-Stokes equations under gravitational fields | The name of first author was misspelled as C.T.Tian in the published
paper. 35 pages,9 figures | J. Comput. Phys., 226 (2007), 2003-2027 | 10.1016/j.jcp.2007.06.024 | null | physics.comp-ph physics.flu-dyn | null | This paper extends the gas-kinetic scheme for one-dimensional inviscid
shallow water equations (J. Comput. Phys. 178 (2002), pp. 533-562) to
multidimensional gas dynamic equations under gravitational fields. Four
important issues in the construction of a well-balanced scheme for gas dynamic
equations are addressed. First, the inclusion of the gravitational source term
into the flux function is necessary. Second, to achieve second-order accuracy
of a well-balanced scheme, the Chapman-Enskog expansion of the Boltzmann
equation with the inclusion of the external force term is used. Third, to avoid
artificial heating in an isolated system under a gravitational field, the
source term treatment inside each cell has to be evaluated consistently with
the flux evaluation at the cell interface. Fourth, the multidimensional
approach with the inclusion of tangential gradients in two-dimensional and
three-dimensional cases becomes important in order to maintain the accuracy of
the scheme. Many numerical examples are used to validate the above issues,
which include the comparison between the solutions from the current scheme and
the Strang splitting method. The methodology developed in this paper can also
be applied to other systems, such as semi-conductor device simulations under
electric fields.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:37:12 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 01:17:12 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Tian",
"C. L.",
""
],
[
"Xu",
"K.",
""
],
[
"Chan",
"K. L.",
""
],
[
"Deng",
"L. C.",
""
]
] |
0707.4392 | Jason Kestner | J. P. Kestner, L.-M. Duan | Effective low-dimensional Hamiltonian for strongly interacting atoms in
a transverse trap | v2: 5 pages, 1 figure; expanded presentation of the formalism | Phys. Rev. A 76, 063610 (2007) | 10.1103/PhysRevA.76.063610 | null | cond-mat.other | null | We derive an effective low-dimensional Hamiltonian for strongly interacting
ultracold atoms in a transverse trapping potential near a wide Feshbach
resonance. The Hamiltonian includes crucial information about transverse
excitations in an effective model with renormalized interaction between atoms
and composite dressed molecules. We fix all the parameters in the Hamiltonian
for both one- and two-dimensional cases.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:38:08 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Dec 2007 03:26:30 GMT"
}
] | 2007-12-13T00:00:00 | [
[
"Kestner",
"J. P.",
""
],
[
"Duan",
"L. -M.",
""
]
] |
0707.4393 | Richard A. Blythe | R. A. Blythe | Reversibility, heat dissipation and the importance of the thermal
environment in stochastic models of nonequilibrium steady states | 8 pages, 2 figures, easy-to-read, single-column, large-print RevTeX4
format; version with modified abstract and additional discussion, references
to appear in Phys Rev Lett | Phys. Rev. Lett. 100, 010601 (2008) | 10.1103/PhysRevLett.100.010601 | null | cond-mat.stat-mech | null | We examine stochastic processes that are used to model nonequilibrium
processes (e.g, pulling RNA or dragging colloids) and so deliberately violate
detailed balance. We argue that by combining an information-theoretic measure
of irreversibility with nonequilibrium work theorems, the thermal physics
implied by abstract dynamics can be determined. This measure is bounded above
by thermodynamic entropy production and so may quantify how well a stochastic
dynamics models reality. We also use our findings to critique various modeling
approaches and notions arising in steady-state thermodynamics.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 15:29:46 GMT"
},
{
"version": "v2",
"created": "Mon, 12 Nov 2007 17:38:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Blythe",
"R. A.",
""
]
] |
0707.4394 | Philippe Corboz | P. Corboz, A. Kleine, F. F. Assaad, I. P. McCulloch, U. Schollw\"ock,
M. Troyer | Systematic errors in Gaussian Quantum Monte Carlo and a systematic study
of the symmetry projection method | 11 pages, 14 figures, revised version, new title | Phys. Rev. B 77, 085108 (2008) | 10.1103/PhysRevB.77.085108 | null | cond-mat.str-el | null | Gaussian Quantum Monte Carlo (GQMC) is a stochastic phase space method for
fermions with positive weights. In the example of the Hubbard model close to
half filling it fails to reproduce all the symmetries of the ground state
leading to systematic errors at low temperatures. In a previous work [Phys.
Rev. B {\bf 72}, 224518 (2005)] we proposed to restore the broken symmetries by
projecting the density matrix obtained from the simulation onto the ground
state symmetry sector. For ground state properties, the accuracy of this method
depends on a {\it large overlap} between the GQMC and exact density matrices.
Thus, the method is not rigorously exact. We present the limits of the approach
by a systematic study of the method for 2 and 3 leg Hubbard ladders for
different fillings and on-site repulsion strengths. We show several indications
that the systematic errors stem from non-vanishing boundary terms in the
partial integration step in the derivation of the Fokker-Planck equation.
Checking for spiking trajectories and slow decaying probability distributions
provides an important test of the reliability of the results. Possible
solutions to avoid boundary terms are discussed. Furthermore we compare results
obtained from two different sampling methods: Reconfiguration of walkers and
the Metropolis algorithm.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:44:10 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 17:26:56 GMT"
}
] | 2008-03-04T00:00:00 | [
[
"Corboz",
"P.",
""
],
[
"Kleine",
"A.",
""
],
[
"Assaad",
"F. F.",
""
],
[
"McCulloch",
"I. P.",
""
],
[
"Schollwöck",
"U.",
""
],
[
"Troyer",
"M.",
""
]
] |
0707.4395 | Tomasz Polak T.P. | T. P. Polak, E. Sarnelli | Resonance phenomena in asymmetric superconducting quantum interference
devices | accepted to PRB, low quality figures | null | 10.1103/PhysRevB.76.014531 | null | cond-mat.supr-con | null | Theory of self induced resonances in asymmetric two-junction interferometer
device is presented. In real devices it is impossible to have an ideal
interferometer free of imperfections. Thus, we extended previous theoretical
approaches introducing a model which contains several asymmetries: Josephson
current $\epsilon$, capacitances $\chi$ and dissipation $\rho$ presented in an
equivalent circuit. Moreover, non conventional symmetry of the order parameter
in high temperature superconducting quantum interference devices forced us to
include phase asymmetries. Therefore, the model has been extended to the case
of $\pi$-shift interferometers, where a phase shift is present in one of the
junctions.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:49:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Polak",
"T. P.",
""
],
[
"Sarnelli",
"E.",
""
]
] |
0707.4396 | Pascal Boyer | Pascal Boyer | La $\mathrm{Z}_l$-cohomologie du mod\`ele de Deligne-Carayol est sans
torsion | the new version is now arXiv:1309.1946 | Journal of Algebra 2011, 336, issue 1, pp 28-52 | null | null | math.AG math.NT math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article is the $\mathrm{Z}_l$-version of my paper "Monodromie du
faisceau pervers des cycles \'evanescents de quelques vari\'et\'es de Shimura
simples" in Invent. Math. 2009 vol 177 pp. 239-280, where we study the
vanishing cycles of some unitary Shimura variety. The aim is to prove that the
cohomology sheaves of this complexe are free so that, thanks to the main
theorem of Berkovich on vanishing cycles, we can deduce that the
$\mathrm{Z}_l$-cohomology of the model of Deligne-Carayol is free. There will
be a second article which will be the $\mathrm{Z}_l$ version of my paper
"Conjecture de monodromie-poids pour quelques vari\'t\'es de Shimura unitaires"
in Compositio vol 146 part 2, pp. 367-403. The aim of this second article will
be to study the torsion of the cohomology groups of these Shimura varieties.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:43:26 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Mar 2008 10:37:51 GMT"
},
{
"version": "v3",
"created": "Tue, 6 Apr 2010 10:59:29 GMT"
},
{
"version": "v4",
"created": "Thu, 24 Sep 2015 11:04:58 GMT"
},
{
"version": "v5",
"created": "Sun, 17 Sep 2017 18:19:24 GMT"
}
] | 2018-09-03T00:00:00 | [
[
"Boyer",
"Pascal",
""
]
] |
0707.4397 | Jeremy M. Hutson | R. Adam Rowlands, Maykel Leonardo Gonzalez-Martinez and Jeremy M.
Hutson | Ultracold collisions in magnetic fields: reducing inelastic cross
sections near Feshbach resonances | 9 pages, 9 figures | null | null | null | physics.chem-ph physics.atm-clus physics.atom-ph | null | We have carried out bound-state and low-energy quantum scattering
calculations on He + NH (triplet Sigma) in magnetic fields, with the NH
molecule in its n=1 rotationally excited states. We have explored the pattern
of levels as a function of magnetic field and identified the nearly good
quantum numbers in different regimes. We have used the bound-state calculations
to locate low-energy Feshbach resonances. When the magnetic field is used to
tune across such a resonance, the real and imaginary part of the scattering
length show asymmetric oscillations and peaks with amplitude between 1 and 3
Angstroms. The scattering length does not pass through a pole at resonance. The
resonant behavior is characterized by a complex resonant scattering length
a_res. The corresponding inelastic cross sections show troughs as well as peaks
near resonance. This may be important for efforts to achieve evaporative and
sympathetic cooling for molecules, because it offers the hope that inelastic
trap losses can be reduced by tuning close to a Feshbach resonance.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:56:43 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Rowlands",
"R. Adam",
""
],
[
"Gonzalez-Martinez",
"Maykel Leonardo",
""
],
[
"Hutson",
"Jeremy M.",
""
]
] |
0707.4398 | Miguel Navascues | Miguel Navascues | Pure state estimation and the characterization of entanglement | Closer to published version | Phys. Rev. Lett. 100, 070503 (2008) | 10.1103/PhysRevLett.100.070503 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A connection between the state estimation problem and the separability
problem is noticed and exploited to find efficient numerical algorithms to
solve the first one. Based on these ideas, we also derive a systematic method
to obtain upper bounds on the maximum local fidelity when the states are
distributed among several distant parties.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:49:30 GMT"
},
{
"version": "v2",
"created": "Fri, 27 Apr 2012 14:17:21 GMT"
}
] | 2012-04-30T00:00:00 | [
[
"Navascues",
"Miguel",
""
]
] |
0707.4399 | Mikael Vejdemo-Johansson | Mikael Vejdemo-Johansson | Enumerating the Saneblidze-Umble diagonal terms | Submitted to JHRS | null | null | null | math.CO math.AT | null | The author presents a computer implementation, calculating the terms of the
Saneblidze-Umble diagonals on the permutahedron and the associahedron. The code
is analyzed for correctness and presented in the paper, the source code of
which simultaneously represents both the paper and the program.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:26:45 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Vejdemo-Johansson",
"Mikael",
""
]
] |
0707.4400 | Maria Harsoula | N. Voglis, M. Harsoula, and G. Contopoulos | Orbital structure in N-Body models of barred galaxies | 14 pages, 25 figures | null | null | null | astro-ph | null | We study the orbital structure of a self-consistent N-body equilibrium
configuration of a barred galaxy constructed from cosmological initial
conditions. The value of its spin parameter L is near the observed value of our
Galaxy L=0.22. We classify the orbits in regular and chaotic using a
combination of two different methods and find 60% of them to be chaotic. We
examine the phase space using projections of the 4D surfaces of section for
test particles as well as for real N-body particles. The real particles are not
uniformly distributed in the whole phase space but they avoid orbits that do
not support the bar. We use frequency analysis for the regular orbits as well
as for the chaotic ones to classify certain types of orbits of our
self-consistent system. We find the main resonant orbits and their statistical
weight in supporting the shape of the bar and we emphasize the role of weakly
chaotic orbits in supporting the boxiness at the end of the bar.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:53:55 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Voglis",
"N.",
""
],
[
"Harsoula",
"M.",
""
],
[
"Contopoulos",
"G.",
""
]
] |
0707.4401 | Mario Ziman | Mario Ziman, Vladimir Buzek | Entanglement measures: state ordering vs local operations | 9 pages, 1 figure, presented at NATO Advanced Research Workshop on
Quantum Communication and Security (September 2006, Gdansk, Poland) | Quantum Communication and Security (edited by M.Zukowski et al.),
pp. 196-204 (IOS Press, 2007) | null | null | quant-ph | null | A set of all states of a bi-partite quantum system can be divided into
subsets each of which contains states with the same degree of entanglement. In
this paper we address a question whether local operations (without classical
communication) affect the entanglement-induced state ordering. We show that
arbitrary unilocal channel (i.e., a channel that acts on one sub-system of a
bi-partite system only) might change the ordering for an arbitrary nontrivial
measure of entanglement. A slightly weaker result holds for the maximally
entangled states. In particular, the maximally entangled states might not
remain the most entangled ones at the output of a unilocal noise channel.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:55:25 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Ziman",
"Mario",
""
],
[
"Buzek",
"Vladimir",
""
]
] |
0707.4402 | Martin Wiebusch | D.A. Ross, M. Wiebusch | MSSM Effects in Top-antitop Production at the LHC | null | JHEP 0711:041,2007 | 10.1088/1126-6708/2007/11/041 | null | hep-ph | null | We report on a calculation of the effects of supersymmetry on the
cross-section for top-antitop production at LHC. A numerical study is carried
out for the ten benchmarks of the Snowmass accord. It is found that the higher
order effects involving supersymmetric particles in internal loops can be as
high as 6%, both for the cross-section and the (parity even) helicity
asymmetry, for one particular benchmark. For other benchmarks smaller but
nonetheless observable corrections are found.
| [
{
"version": "v1",
"created": "Fri, 27 Jul 2007 21:14:19 GMT"
}
] | 2011-01-13T00:00:00 | [
[
"Ross",
"D. A.",
""
],
[
"Wiebusch",
"M.",
""
]
] |
0707.4403 | Rainer Plaga | R. Plaga | Empirical constraints on vacuum decay in the stringy landscape | 13 pages, 2 figures, proposes a laboratory experiment | Int.J.Mod.Phys.A22:2661-2672,2007 | 10.1142/S0217751X07036737 | null | hep-ph hep-th | null | It is generally considered as self evident that the lifetime of our vacuum in
the landscape of string theory cannot be much shorter than the current age of
the universe. Here I show why this lower limit is invalid. A certain type of
``parallel universes'' is a necessary consequence of the string-landscape
dynamics and might well allow us to ``survive'' vacuum decay. As a consequence
our stringy vacuum's lifetime is empirically unconstrained and could be very
short. Based on this counter-intuitive insight I propose a novel type of
laboratory experiment that searches for an apparent violation of the
quantum-mechanical Born rule by gravitational effects on vacuum decay. If the
lifetime of our vacuum should turn out to be shorter than 6 x 10^{-13} seconds
such an experiment is sufficiently sensitive to determine its value with
state-of-the-art equipment.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:57:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Plaga",
"R.",
""
]
] |
0707.4404 | Miron Amusia | M. Ya. Amusia (1, 2), A. S. Baltenkov (3) and L. V. Chernysheva
(2)((1)Hebrew University, Jerusalem, Israel; (2) Ioffe Physical-Technical
Institute, St.-Petersburg, Russia; (3) Arifov Institute of Electronics,
Tashkent, Uzbekistan) | Giant resonances of endohedral atoms | 7pages, 3 figures, 14 references,some previous references are removed | null | 10.1134/S0021364008040048 | null | physics.chem-ph physics.atm-clus | null | We demonstrate for the first time that the effect of fullerene shell upon
photoionization of the "caged" atom in an endohedral can result in formation of
Giant Endohedral Resonances or GER. This is illustrated by the concrete case of
Xe@C60 photoionization cross-section that exhibits at 17 eV a powerful
resonance with total oscillator strengths of about 25. The prominent
modification of the 5p6 electron photoionization cross-section of Xe@C60 takes
place due to strong fullerene shell polarization under the action of the
incoming electromagnetic wave and oscillation of this cross-section due to the
reflection of the photoelectron from Xe by the C60. These two factors transform
the smoothly decreasing 5p6 cross-section of Xe into a rather complex curve
with a powerful maximum for Xe@C60, with the oscillator strength being equal to
25! We present also the results for the dipole angular anisotropy parameter
that is strongly affected by the reflection of the photoelectron waves but not
modified by C60 polarization. The polarization of C60 is expressed via its
total photoabsorption cross-section. The reflection of the photoelectron is
taken into account in the frame of the so-called bubble potential that is a
spherical delta-type potential.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 12:57:50 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Aug 2007 12:04:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Amusia",
"M. Ya.",
""
],
[
"Baltenkov",
"A. S.",
""
],
[
"Chernysheva",
"L. V.",
""
]
] |
0707.4405 | Giorgio Torrieri | Giorgio Torrieri, Boris Tomasik, Igor Mishustin | Bulk Viscosity driven clusterization of quark-gluon plasma and early
freeze-out in relativistic heavy-ion collisions | Accepted for publication, Phys. Rev. C. Arguments considerably
expanded, refined and reworded | Phys.Rev.C77:034903,2008 | 10.1103/PhysRevC.77.034903 | null | nucl-th hep-ph | null | We introduce a new scenario for heavy ion collisions that could solve the
lingering problems associated with the so-called HBT puzzle. We postulate that
the system starts expansion as the perfect quark-gluon fluid but close to
freeze-out it splits into clusters, due to a sharp rise of bulk viscosity in
the vicinity of the hadronization transition. We then argue that the
characteristic cluster size is determined by the viscosity coefficient and the
expansion rate. Typically it is much smaller and independent of the total
system volume. These clusters maintain the pre-existing outward-going flow, as
a spray of droplets, but develop no flow of their own, and hadronize by
evaporation. We provide an ansatz for converting the hydrodynamic output into
clusters.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:04:43 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Feb 2008 20:07:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Torrieri",
"Giorgio",
""
],
[
"Tomasik",
"Boris",
""
],
[
"Mishustin",
"Igor",
""
]
] |
0707.4406 | Jacob Linder | J. Linder and A. Sudb{\o} | Dirac-fermions and conductance-oscillations in (s,d)-wave
superconductor/normal graphene junctions | 4 pages, 2 figures. Accepted for publication in Phys. Rev. Lett | Phys. Rev. Lett 99, 147001 (2007) | 10.1103/PhysRevLett.99.147001 | null | cond-mat.supr-con | null | We investigate quantum transport in a normal/superconductor graphene
heterostructure, including the possibility of an anisotropic pairing potential
in the superconducting region. We find that under certain circumstances, the
conductance displays an undamped, oscillatory behaviour as a function of
applied bias voltage. Also, we investigate how the conductance spectra are
affected by a d-wave pairing symmetry. These results combine unusual features
of the electronic structure of graphene with the unconventional pairing
symmetry found for instance in high-T_c superconductors.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:10:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Linder",
"J.",
""
],
[
"Sudbø",
"A.",
""
]
] |
0707.4407 | Yuri Obukhov | Friedrich W. Hehl, Yuri N. Obukhov, Jean-Pierre Rivera, Hans Schmid | Relativistic nature of a magnetoelectric modulus of Cr_2O_3-crystals: a
new 4-dimensional pseudoscalar and its measurement | Revtex, 36 pages, 9 figures (submitted in low resolution, better
quality figures are available from the authors) | Phys.Rev.A77:022106,2008 | 10.1103/PhysRevA.77.022106 | null | cond-mat.other cond-mat.mes-hall hep-ph | null | Earlier, the magnetoelectric effect of chromium sesquioxide Cr_2O_3 has been
determined experimentally as a function of temperature. One measures the
electric field-induced magnetization on Cr_2O_3 crystals or the magnetic
field-induced polarization. From the magnetoelectric moduli of Cr_2O_3 we
extract a 4-dimensional relativistic invariant pseudoscalar
$\widetilde{\alpha}$. It is temperature dependent and of the order of
10^{-4}/Z_0, with Z_0 as vacuum impedance. We show that the new pseudoscalar is
odd under parity transformation and odd under time inversion. Moreover,
$\widetilde{\alpha}$ is for Cr_2O_3 what Tellegen's gyrator is for two port
theory, the axion field for axion electrodynamics, and the PEMC (perfect
electromagnetic conductor) for electrical engineering.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:12:24 GMT"
}
] | 2011-09-07T00:00:00 | [
[
"Hehl",
"Friedrich W.",
""
],
[
"Obukhov",
"Yuri N.",
""
],
[
"Rivera",
"Jean-Pierre",
""
],
[
"Schmid",
"Hans",
""
]
] |
0707.4408 | Thomas A. Ivey | Jeanne N. Clelland, Thomas A. Ivey | Backlund Transformations and Darboux Integrability for Nonlinear Wave
Equations | 48 pages; submitted, in revised form, to Asian J. Math | null | null | null | math.DG math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that second-order hyperbolic Monge-Ampere equations for one function
of two variables are connected to the wave equation by a Backlund
transformation if and only if they are integrable by the method of Darboux at
second order. One direction of proof, proving Darboux integrability, follows
the implications of the wave equation for the invariants of the G-structure
associated to the Backlund transformation. The other direction constructs
Backlund transformations for Darboux integrable equations as solutions of an
involutive exterior differential system. Explicit transformations are given for
several equations on the Goursat-Vessiot list of Darboux-integrable equations.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:16:16 GMT"
},
{
"version": "v2",
"created": "Fri, 27 Jun 2008 19:23:36 GMT"
}
] | 2008-06-27T00:00:00 | [
[
"Clelland",
"Jeanne N.",
""
],
[
"Ivey",
"Thomas A.",
""
]
] |
0707.4409 | Stefano Minardi | Stefano Minardi, Amrutha Gopal, Michael Tatarakis, Arnaud Couairon
Gintaras Tamosauskas, Rimtautas Piskarskas, Audrius Dubietis, Paolo Di
Trapani | Time-resolved refractive index and absorption mapping of light-plasma
filaments in water | 3 pages, 3 pictures | null | 10.1364/OL.33.000086 | null | physics.optics physics.plasm-ph | null | By means of a quantitative shadowgraphic method, we performed a space-time
characterization of the refractive index variation and transient absorption
induced by a light-plasma filament generated by a 100 fs laser pulse in water.
The formation and evolution of the plasma channel in the proximity of the
nonlinear focus were observed with a 23 fs time resolution.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:16:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Minardi",
"Stefano",
""
],
[
"Gopal",
"Amrutha",
""
],
[
"Tatarakis",
"Michael",
""
],
[
"Tamosauskas",
"Arnaud Couairon Gintaras",
""
],
[
"Piskarskas",
"Rimtautas",
""
],
[
"Dubietis",
"Audrius",
""
],
[
"Di Trapani",
"Paolo",
""
]
] |
0707.4410 | Frederik Scholtz | S. Khan, B. Chakraborty, F. G. Scholtz | On the role of twisted statistics in the noncommutative degenerate
electron gas | null | Phys.Rev.D78:025024,2008 | 10.1103/PhysRevD.78.025024 | null | hep-th | null | We consider the problem of a degenerate electron gas in the background of a
uniformly distributed positive charge, ensuring overall neutrality of the
system, in the presence of non-commutativity. In contrast to previous
calculations that did not include twisted statistics, we find corrections to
the ground state energy already at first order in perturbation theory when the
twisted statistics is taken into account. These corrections arise since the
interaction energy is sensitive to two particle correlations, which are
modified for twisted anti-commutation relations.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:16:40 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Khan",
"S.",
""
],
[
"Chakraborty",
"B.",
""
],
[
"Scholtz",
"F. G.",
""
]
] |
0707.4411 | Amlan Biswas | G. Singh-Bhalla, S. Selcuk, T. Dhakal, A. Biswas, A. F. Hebard | Intrinsic tunneling in phase separated manganites | changed content; accepted for publication in Physical Review Letters,
5 pages, 4 figures | Physical Review Letters 102, 077205 (2009) | null | null | cond-mat.str-el cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present evidence of direct electron tunneling across intrinsic insulating
regions in sub-micrometer wide bridges of the phase separated ferromagnet
(La,Pr,Ca)MnO$_3$. Upon cooling below the Curie temperature, a predominantly
ferromagnetic supercooled state persists where tunneling across the intrinsic
tunnel barriers (ITBs) results in metastable, temperature-independent,
high-resistance plateaus over a large range of temperatures. Upon application
of a magnetic field, our data reveal that the ITBs are extinguished resulting
in sharp, colossal, low-field resistance drops. Our results compare well to
theoretical predictions of magnetic domain walls coinciding with the intrinsic
insulating phase.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:23:25 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Feb 2009 19:53:43 GMT"
}
] | 2015-08-10T00:00:00 | [
[
"Singh-Bhalla",
"G.",
""
],
[
"Selcuk",
"S.",
""
],
[
"Dhakal",
"T.",
""
],
[
"Biswas",
"A.",
""
],
[
"Hebard",
"A. F.",
""
]
] |
0707.4412 | Kenneth Hicks | K. Hicks, T. Mibe, M. Sumihama, et al (for the LEPS Collaboration) | Measurement of the $\vec{\gamma} p \to K^+ \Lambda$ Reaction at Backward
Angles | 6 figures, submitted to PRC rapid communications | Phys. Rev. C 76, 042201 (2007) | 10.1103/PhysRevC.76.042201 | null | nucl-ex | null | Cross sections for the $\gamma p \to K^+ \Lambda$ have been measured at
backward angles using linearly polarized photons in the range 1.50 to 2.37 GeV.
In addition, the beam asymmetry for this reaction has been measured for the
first time at backward angles. The $\Lambda$ was detected at forward angles in
the LEPS spectrometer via its decay to $p\pi^-$ and the K^+ was inferred using
the technique of missing mass. These measurements, corresponding to kaons at
far backward angles in the center-of-mass frame, complement similar CLAS data
at other angles. Comparison with theoretical models shows that the reactions in
these kinematics provide further opportunities to investigate the reaction
mechanisms of hadron dynamics.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 19:30:16 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Hicks",
"K.",
""
],
[
"Mibe",
"T.",
""
],
[
"Sumihama",
"M.",
""
]
] |
0707.4413 | Jacob Linder | J. Linder and A. Sudb{\o} | Josephson effect in thin-film superconductor/insulator/superconductor
junctions with misaligned in-plane magnetic fields | 8 pages, 8 figures. Accepted for publication in Phys. Rev. B | Phys. Rev. B 76, 064524 (2007) | 10.1103/PhysRevB.76.064524 | null | cond-mat.supr-con | null | We study a tunnel junction consisting of two thin-film s-wave superconductors
separated by a thin, insulating barrier in the presence of misaligned in-plane
exchange fields. We find an interesting interplay between the superconducting
phase difference and the relative orientation of the exchange fields,
manifested in the Josephson current across the junction. Specifically, this may
be written $I_\text{J}^\text{C} = (I_0+I_m ~ \cos\phi) \sin\Delta\theta$, where
I_0 and I_m are constants, and $\phi$ is the relative orientation of the
exchange fields while $\Delta\theta$ is the superconducting phase difference.
Similar results have recently been obtained in other S/I/S junctions coexisting
with helimagnetic or ferromagnetic order. We calculate the superconducting
order parameter self-consistently, and investigate quantitatively the effect
which the misaligned exchange fields constitute on the Josephson current, to
see if I_m may have an appreciable effect on the Josephson current. It is found
that I_0 and I_m become comparable in magnitude at sufficiently low
temperatures and fields close to the critical value, in agreement with previous
work. From our analytical results, it then follows that the Josephson current
in the present system may be controlled in a well-defined manner by a rotation
of the exchange fields on both sides of the junction. We discuss a possible
experimental realization of this proposition.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:29:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Linder",
"J.",
""
],
[
"Sudbø",
"A.",
""
]
] |
0707.4414 | Vladimir Lazi\'c | Vladimir Lazic | On Shokurov-type b-divisorial algebras of higher rank | some notation changed, Theorem 3.1 slightly generalised, new
references added | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this paper is to lay the foundations for the theory of higher
rank b-divisorial algebras of Shokurov type. We develop techniques to deal with
such objects and propose two natural conjectures regarding Shokurov algebras
and adjoint algebras. We confirm these conjectures in the case of affine
curves.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 18:18:22 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Dec 2008 15:00:39 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Lazic",
"Vladimir",
""
]
] |
0707.4415 | Alexander D. Panov | A. D. Panov, N. V. Sokolskaya, J. H. Adams, Jr., H. S. Ahn, G. L.
Bashindzhagyan, K. E. Batkov, J. Chang, M. Christl, A. R. Fazely, O. Ganel,
R. M. Gunasingha, T. G. Guzik, J. Isbert, K. C. Kim, E. N. Kouznetsov, M. I.
Panasyuk, W. K. H. Schmidt, E. S. Seo, J. Watts, J. P. Wefel, J. Wu, V. I.
Zatsepin | Relative abundances of cosmic ray nuclei B-C-N-O in the energy region
from 10 GeV/n to 300 GeV/n. Results from ATIC-2 (the science flight of ATIC) | 4 pages,2 figures, a paper for 30-th International Cosmic Rays
Conference | null | null | null | astro-ph | null | The ATIC balloon-borne experiment measures the energy spectra of elements
from H to Fe in primary cosmic rays from about 100 GeV to 100 TeV. ATIC is
comprised of a fully active bismuth germanate calorimeter, a carbon target with
embedded scintillator hodoscopes, and a silicon matrix that is used as the main
charge detector. The silicon matrix produces good charge resolution for protons
and helium but only partial resolution for heavier nuclei. In the present
paper, the charge resolution of ATIC was improved and backgrounds were reduced
in the region from Be to Si by using the upper layer of the scintillator
hodoscope as an additional charge detector. The flux ratios of nuclei B/C, C/O,
N/O in the energy region from about 10 GeV/nucleon to 300 GeV/nucleon obtained
from this high-resolution, high-quality charge spectra are presented, and
compared with existing theoretical predictions.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:46:39 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"Panov",
"A. D.",
""
],
[
"Sokolskaya",
"N. V.",
""
],
[
"Adams,",
"J. H.",
"Jr."
],
[
"Ahn",
"H. S.",
""
],
[
"Bashindzhagyan",
"G. L.",
""
],
[
"Batkov",
"K. E.",
""
],
[
"Chang",
"J.",
""
],
[
"Christl",
"M.",
""
],
[
"Fazely",
"A. R.",
""
],
[
"Ganel",
"O.",
""
],
[
"Gunasingha",
"R. M.",
""
],
[
"Guzik",
"T. G.",
""
],
[
"Isbert",
"J.",
""
],
[
"Kim",
"K. C.",
""
],
[
"Kouznetsov",
"E. N.",
""
],
[
"Panasyuk",
"M. I.",
""
],
[
"Schmidt",
"W. K. H.",
""
],
[
"Seo",
"E. S.",
""
],
[
"Watts",
"J.",
""
],
[
"Wefel",
"J. P.",
""
],
[
"Wu",
"J.",
""
],
[
"Zatsepin",
"V. I.",
""
]
] |
0707.4416 | Bal\'azs Kozma | Balazs Kozma and Alain Barrat | Consensus formation on adaptive networks | 11 pages, 14 figures | Phys. Rev. E 77, 016102 (2008) | 10.1103/PhysRevE.77.016102 | null | physics.soc-ph cond-mat.stat-mech | null | The structure of a network can significantly influence the properties of the
dynamical processes which take place on them. While many studies have been
devoted to this influence, much less attention has been devoted to the
interplay and feedback mechanisms between dynamical processes and network
topology on adaptive networks. Adaptive rewiring of links can happen in real
life systems such as acquaintance networks where people are more likely to
maintain a social connection if their views and values are similar. In our
study, we consider different variants of a model for consensus formation. Our
investigations reveal that the adaptation of the network topology fosters
cluster formation by enhancing communication between agents of similar opinion,
though it also promotes the division of these clusters. The temporal behavior
is also strongly affected by adaptivity: while, on static networks, it is
influenced by percolation properties, on adaptive networks, both the early and
late time evolution of the system are determined by the rewiring process. The
investigation of a variant of the model reveals that the scenarios of
transitions between consensus and polarized states are more robust on adaptive
networks.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:50:08 GMT"
}
] | 2008-01-10T00:00:00 | [
[
"Kozma",
"Balazs",
""
],
[
"Barrat",
"Alain",
""
]
] |
0707.4417 | Kai Martens | K. Martens (for the High Resolution Fly's Eye Collaboration) | HiRes Estimates and Limits for Neutrino Fluxes at the Highest Energies | 12 pages, 6 figures, for Lepton Photon 2007 | null | null | null | astro-ph | null | The High Resolution Fly's Eye Experiment (HiRes) measures cosmic rays (CR) at
the highest energies using the air fluorescence technique. As data taking on
the Dugway Proving Grounds in Western Utah is finished, the HiRes data are
relevant for cosmogenic neutrinos in two different ways. We first use our best
fit to the measured HiRes CR spectrum together with a model of the
extragalactic CR sources to derive the expected cosmogenic neutrino and gamma
ray fluxes at Earth. We then use the HiRes data directly to set competitive
experimental limits on the electron and tau neutrino fluxes at the highest
energies.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 14:09:12 GMT"
}
] | 2019-08-14T00:00:00 | [
[
"Martens",
"K.",
"",
"for the High Resolution Fly's Eye Collaboration"
]
] |
0707.4418 | Juergen Jost | Boris S. Gutkin, Juergen Jost and Henry C. Tuckwell | Transient termination of synaptically sustained spiking by stochastic
inputs in a pair of coupled Type 1 neurons | null | null | null | null | q-bio.NC | null | We examine the effects of stochastic input currents on the firing behavior of
two excitable neurons coupled with fast excitatory synapses. In such cells
(models), typified by the quadratic integrate and fire model, mutual synaptic
coupling can cause sustained firing or oscillatory behavior which is
necessarily antiphase. Additive Gaussian white noise can transiently terminate
the oscillations, hence destroying the stable limit cycle. Further application
of the noise may return the system to spiking activity. In a particular noise
range, the transition times between the oscillating and the resting state are
strongly asymmetric. We numerically investigate an approximate basin of
attraction, A, of the periodic orbit and use Markov process theory to explain
the firing behavior in terms of the probability of escape of trajectories from
A
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:56:22 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Gutkin",
"Boris S.",
""
],
[
"Jost",
"Juergen",
""
],
[
"Tuckwell",
"Henry C.",
""
]
] |
0707.4419 | Xuepeng Chen | Xuepeng Chen (1), Ralf Launhardt (1), Thomas Henning (1) ((1) Max
Planck Institute for Astronomy) | OVRO N2H+ Observations of Class 0 Protostars: Constraints on the
Formation of Binary Stars | 35 pages, 9 figures (one in color), 6 tables. Accepted by ApJ (to
appear in Nov. 2007) | null | 10.1086/521868 | null | astro-ph | null | We present the results of an interferometric study of the N2H+(1--0) emission
from nine nearby, isolated, low-mass protostellar cores, using the OVRO
millimeter array. The main goal of this study is the kinematic characterization
of the cores in terms of rotation, turbulence, and fragmentation. Eight of the
nine objects have compact N2H+ cores with FWHM radii of 1200 -- 3500 AU,
spatially coinciding with the thermal dust continuum emission. The only more
evolved (Class I) object in the sample (CB 188) shows only faint and extended
N2H+ emission. The mean N2H+ line width was found to be 0.37 km/s. Estimated
virial masses range from 0.3 to 1.2 M_sun. We find that thermal and turbulent
energy support are about equally important in these cores, while rotational
support is negligible. The measured velocity gradients across the cores range
from 6 to 24 km/s/pc. Assuming these gradients are produced by bulk rotation,
we find that the specific angular momenta of the observed Class 0 protostellar
cores are intermediate between those of dense (prestellar) molecular cloud
cores and the orbital angular momenta of wide PMS binary systems. There appears
to be no evolution (decrease) of angular momentum from the smallest prestellar
cores via protostellar cores to wide PMS binary systems. In the context that
most protostellar cores are assumed to fragment and form binary stars, this
means that most of the angular momentum contained in the collapse region is
transformed into orbital angular momentum of the resulting stellar binary
systems.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 13:57:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chen",
"Xuepeng",
""
],
[
"Launhardt",
"Ralf",
""
],
[
"Henning",
"Thomas",
""
]
] |
0707.4420 | Graeme Candlish | Graeme N. Candlish and Harvey S. Reall | On the smoothness of static multi-black hole solutions of
higher-dimensional Einstein-Maxwell theory | 19 pages; minor corrections | Class.Quant.Grav.24:6025-6040,2007 | 10.1088/0264-9381/24/23/022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Previous work has shown that static multi-black hole solutions of
higher-dimensional Einstein-Maxwell theory do not possess smooth horizons. We
show that the lack of smoothness is worse than previously demonstrated. We
consider solutions describing multiple black holes on a common axis. In five
dimensions, the metric is generically twice, but not three times, continuously
differentiable at the horizon. The Maxwell field is generically continuous, but
not differentiable, at the horizon. In more than five dimensions, the metric is
once, but not twice, continuously differentiable, and there is a
parallely-propagated curvature singularity at the horizon. The Maxwell field
strength is again continuous, but not differentiable, at the horizon.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 14:07:24 GMT"
},
{
"version": "v2",
"created": "Tue, 5 May 2009 13:39:18 GMT"
}
] | 2009-05-05T00:00:00 | [
[
"Candlish",
"Graeme N.",
""
],
[
"Reall",
"Harvey S.",
""
]
] |
0707.4421 | Bruno S\'anchez-Andrade Nu\~no | B. S\'anchez-Andrade Nu\~no, R. Centeno, K. G. Puschmann, J. Trujillo
Bueno, J. Blanco Rodr\'iguez, F. Kneer | Spicule emission profiles observed in \ion{He}{i} 10830 \AA | letter accepted in A&A. 5 figures | null | 10.1051/0004-6361:20077936 | null | astro-ph | null | Off-the-limb observations with high spatial and spectral resolution will help
us understand the physical properties of spicules in the solar chromosphere
Spectropolarimetric observations of spicules in the \ion{He}{i} 10830 \AA\
multiplet were obtained with the Tenerife Infrared Polarimeter on the German
Vacuum Tower Telescope at the Observatorio del Teide (Tenerife, Spain). The
analysis shows the variation of the off-limb emission profiles as a function of
the distance to the visible solar limb. The ratio between the intensities of
the blue and the red components of this triplet $({\cal R}=I_{\rm blue}/I_{\rm
red})$ is an observational signature of the optical thickness along the light
path, which is related to the intensity of the coronal irradiation. We present
observations of the intensity profiles of spicules above a quiet Sun region.
The observable ${\cal R}$ as a function of the distance to the visible limb is
also given. We have compared our observational results to the intensity ratio
obtained from detailed radiative transfer calculations in semi-empirical models
of the solar atmosphere assuming spherical geometry. The agreement is purely
qualitative. We argue that future models of the solar chromosphere and
transition region should account for the observational constraints presented
here.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 14:09:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nuño",
"B. Sánchez-Andrade",
""
],
[
"Centeno",
"R.",
""
],
[
"Puschmann",
"K. G.",
""
],
[
"Bueno",
"J. Trujillo",
""
],
[
"Rodríguez",
"J. Blanco",
""
],
[
"Kneer",
"F.",
""
]
] |
0707.4422 | Dmitrii L. Maslov | Andrey V. Chubukov, Dmitrii L. Maslov, and Ronojoy Saha | Specific heat of a one-dimensional interacting Fermi system: the role of
anomalies | 20 pages, 7 figures; discussion of the two-cutoff model is modified;
a new figure is added | Phys. Rev. B v. 77, 085109 (2008) | 10.1103/PhysRevB.77.085109 | null | cond-mat.str-el cond-mat.mes-hall | null | We re-visit the issue of the temperature dependence of the specific heat C(T)
for interacting fermions in 1D. The charge component C_c(T) scales linearly
with T, but the spin component C_s (T) displays a more complex behavior with T
as it depends on the backscattering amplitude, g_1, which scales down under RG
transformation and eventually behaves as g_1 (T) \sim 1/\log T. We show,
however, by direct perturbative calculations that C_s(T) is strictly linear in
T to order g^2_1 as it contains the renormalized backscattering amplitude not
on the scale of T, but at the cutoff scale set by the momentum dependence of
the interaction around 2k_F. The running amplitude g_1 (T) appears only at
third order and gives rise to an extra T/\log^3 T term in C_s (T). This agrees
with the results obtained by a variety of bosonization techniques. We also show
how to obtain the same expansion in g_1 within the sine-Gordon model.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 14:09:23 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Oct 2007 19:17:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chubukov",
"Andrey V.",
""
],
[
"Maslov",
"Dmitrii L.",
""
],
[
"Saha",
"Ronojoy",
""
]
] |
0707.4423 | Achille A. Nucita | A.F. Zakharov, A.A. Nucita, F. De Paolis and G. Ingrosso | Apoastron Shift Constraints on Dark Matter Distribution at the Galactic
Center | in press on Phys. Rev. D | Phys.Rev.D76:062001,2007 | 10.1103/PhysRevD.76.062001 | null | astro-ph | null | The existence of dark matter (DM) at scales of few pc down to $\simeq
10^{-5}$ pc around the centers of galaxies and in particular in the Galactic
Center region has been considered in the literature. Under the assumption that
such a DM clump, principally constituted by non-baryonic matter (like WIMPs)
does exist at the center of our galaxy, the study of the $\gamma$-ray emission
from the Galactic Center region allows us to constrain both the mass and the
size of this DM sphere. Further constraints on the DM distribution parameters
may be derived by observations of bright infrared stars around the Galactic
Center. Hall and Gondolo \cite{hallgondolo} used estimates of the enclosed mass
obtained in various ways and tabulated by Ghez et al.
\cite{Ghez_2003,Ghez_2005}. Moreover, if a DM cusp does exist around the
Galactic Center it could modify the trajectories of stars moving around it in a
sensible way depending on the DM mass distribution. Here, we discuss the
constraints that can be obtained with the orbit analysis of stars (as S2 and
S16) moving inside the DM concentration with present and next generations of
large telescopes. In particular, consideration of the S2 star apoastron shift
may allow improving limits on the DM mass and size.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 14:15:06 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zakharov",
"A. F.",
""
],
[
"Nucita",
"A. A.",
""
],
[
"De Paolis",
"F.",
""
],
[
"Ingrosso",
"G.",
""
]
] |
0707.4424 | Nouicer Rachid | Rachid Nouicer (for the PHOBOS Collaboration) | Elliptic Flow, Initial Eccentricity and Elliptic Flow fluctuations in
Heavy Ion Collisions at RHIC | To appear in the proceedings of the Lake Louise Winter Institute
2007. The proceedings of the institute will be published by World Scientific | null | 10.1142/9789812776105_0040 | null | nucl-ex | null | We present measurements of elliptic flow and event-by-event fluctuations
established by the PHOBOS experiment. Elliptic flow scaled by participant
eccentricity is found to be similar for both systems when collisions with the
same number of participants or the same particle area density are compared. The
agreement of elliptic flow between Au+Au and Cu+Cu collisions provides evidence
that the matter is created in the initial stage of relativistic heavy ion
collisions with transverse granularity similar to that of the participant
nucleons. The event-by-event fluctuation results reveal that the initial
collision geometry is translated into the final state azimuthal particle
distribution, leading to an event-by-event proportionality between the observed
elliptic flow and initial eccentricity.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 14:22:46 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Nouicer",
"Rachid",
"",
"for the PHOBOS Collaboration"
]
] |
0707.4425 | Luciano Vanzo | R. Di Criscienzo, M. Nadalini, L. Vanzo, S. Zerbini, G. Zoccatelli | On the Hawking radiation as tunneling for a class of dynamical black
holes | added references for section 1, corrected typos, some improvement in
notation | Phys.Lett.B657:107-111,2007 | 10.1016/j.physletb.2007.10.005 | null | hep-th | null | The instability against emission of massless particles by the trapping
horizon of an evolving black hole is analyzed with the use of the
Hamilton-Jacobi method. The method automatically selects one special expression
for the surface gravity of a changing horizon. Indeed, the strength of the
horizon singularity turns out to be governed by the surface gravity as was
defined a decade ago by Hayward using Kodama's theory of spherically symmetric
gravitational fields. The theory also applies to point masses embedded in an
expanding universe, were the surface gravity is still related to Kodama-Hayward
theory. As a bonus of the tunneling method, we gain the insight that the
surface gravity still defines a temperature parameter as long as the evolution
is sufficiently slow that the black hole pass through a sequence of
quasi-equilibrium states.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 14:37:35 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 13:29:48 GMT"
},
{
"version": "v3",
"created": "Wed, 3 Oct 2007 13:11:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Di Criscienzo",
"R.",
""
],
[
"Nadalini",
"M.",
""
],
[
"Vanzo",
"L.",
""
],
[
"Zerbini",
"S.",
""
],
[
"Zoccatelli",
"G.",
""
]
] |
0707.4426 | Tae-Suk Kim | Tae-Suk Kim, B. C. Lee, Hyun-Woo Lee | Effect of ferromagnetic contacts on spin accumulation in an all-metallic
lateral spin-valve system: Semiclassical spin drift-diffusion equations | 13 pages, 1 figure, revised version | Phys. Rev. B 78, 214427 (2008) | 10.1103/PhysRevB.78.214427 | null | cond-mat.mes-hall cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of the ferromagnetic (FM) contacts on the spin
accumulation in the lateral spin valve system for the collinear magnetization
configurations. When an additional FM electrode is introduced in the
all-metallic lateral spin-valve system, we find that the transresistance can be
fractionally suppressed or very weakly influenced depending on the position of
the additional FM electrode, and relative magnitudes of contact resistance and
the bulk resistance defined over the spin diffusion length. Nonlocal spin
signals such as nonlocal voltage drop and leakage spin currents are independent
of the magnetization orientation of the additional FM electrode. Even when the
additional contact is nonmagnetic, nonlocal spin signals can be changed by the
spin current leaking into the nonmagnetic electrode.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 14:37:37 GMT"
},
{
"version": "v2",
"created": "Thu, 8 Nov 2007 07:26:07 GMT"
},
{
"version": "v3",
"created": "Fri, 31 Oct 2008 16:06:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kim",
"Tae-Suk",
""
],
[
"Lee",
"B. C.",
""
],
[
"Lee",
"Hyun-Woo",
""
]
] |
0707.4427 | Khamidbi Beshtoev Mukhamedovich | Kh. M. Beshtoev | Examination of unitarity condition (positive definiteness of expression
for transition probabilities) at three neutrino oscillations in vacuum | 13 pages, 11 figures | null | null | null | hep-ph | null | This work has shown that at strict fulfilment of condition $\Delta m^2_{1 3}
= \Delta m^2_{1 2} + \Delta m^2_{2 3}$ the expression for probability of $\nu_e
\to \nu_e$ transitions $P_{\nu_e \to \nu_e}(t)$ is positively defined at every
values of $\theta$ and $\beta$ while at any arbitrarily small deviation from
this condition it becomes negative. In order to make this expression for
probability transitions positively defined, it is necessary to put a limitation
on angle mixing $\beta$ at fixed value of $\theta= 32.45^o$ (i.e. the value for
$\beta$ must be $\beta \le 15^o \div 17^o$).
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 14:52:26 GMT"
}
] | 2007-07-31T00:00:00 | [
[
"Beshtoev",
"Kh. M.",
""
]
] |
0707.4428 | Scott N. Walck | Scott N. Walck, David W. Lyons | Only n-Qubit Greenberger-Horne-Zeilinger States are Undetermined by
their Reduced Density Matrices | 4 pages | Phys. Rev. Lett. 100, 050501 (2008) | 10.1103/PhysRevLett.100.050501 | null | quant-ph | null | The generalized n-qubit Greenberger-Horne-Zeilinger (GHZ) states and their
local unitary equivalents are the only states of n qubits that are not uniquely
determined among pure states by their reduced density matrices of n-1 qubits.
Thus, among pure states, the generalized GHZ states are the only ones
containing information at the n-party level. We point out a connection between
local unitary stabilizer subgroups and the property of being determined by
reduced density matrices.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 14:53:05 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 15:30:12 GMT"
}
] | 2008-10-12T00:00:00 | [
[
"Walck",
"Scott N.",
""
],
[
"Lyons",
"David W.",
""
]
] |
0707.4429 | Zeyher | Rolf Heid, Klaus-Peter Bohnen, Roland Zeyher, and Dirk Manske | Momentum dependence of the electron-phonon coupling and self-energy
effects in YBa_2Cu_3O_7 within the local density approximation | Figure 1 slightly revised, text shortened, accepted as a PRL | Phys. Rev. Lett. 100, 137001 (2008) | 10.1103/PhysRevLett.100.137001 | null | cond-mat.supr-con cond-mat.str-el | null | Using the local density approximation (LDA) and a realistic phonon spectrum
we determine the momentum and frequency dependence of $\alpha^2F({\bf
k},\omega)$ in YBa$_2$Cu$_3$O$_7$ for the bonding, antibonding, and chain band.
The resulting self-energy $\Sigma$ is rather small near the Fermi surface. For
instance, for the antibonding band the maximum of $Re \Sigma$ as a function of
frequency is about 7 meV at the nodal point in the normal state and the ratio
of bare and renormalized Fermi velocities 1.18. These values are a factor 3-5
too small compared to the experiment showing that only a small part of $\Sigma$
can be attributed to phonons. Furthermore, the frequency dependence of the
renormalization factor $Z({\bf k},\omega)$ is smooth and has no anomalies at
the observed kink frequencies which means that phonons cannot produce
well-pronounced kinks in stoichiometric YBa$_2$Cu$_3$O$_7$, at least, within
the LDA.
| [
{
"version": "v1",
"created": "Mon, 30 Jul 2007 14:57:02 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Aug 2007 14:37:22 GMT"
},
{
"version": "v3",
"created": "Thu, 21 Feb 2008 13:51:53 GMT"
}
] | 2008-04-21T00:00:00 | [
[
"Heid",
"Rolf",
""
],
[
"Bohnen",
"Klaus-Peter",
""
],
[
"Zeyher",
"Roland",
""
],
[
"Manske",
"Dirk",
""
]
] |
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