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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.2214 | Tatiana Kuriabova | Tatiana Kuriabova, Alex Levine | Nanorheology of viscoelastic shells: Applications to viral capsids | 17 pages | null | 10.1103/PhysRevE.77.031921 | null | cond-mat.soft q-bio.SC | null | We study the microrheology of nanoparticle shells [Dinsmore et al. Science
298, 1006 (2002)] and viral capsids [Ivanovska et al. PNAS 101, 7600 (2004)] by
computing the mechanical response function and thermal fluctuation spectrum of
a viscoelastic spherical shell that is permeable to the surrounding solvent. We
determine analytically the damped dynamics of the shear, bend, and compression
modes of the shell coupled to the solvent both inside and outside the sphere in
the zero Reynolds number limit. We identify fundamental length and time scales
in the system, and compute the thermal correlation function of displacements of
antipodal points on the sphere and the mechanical response to pinching forces
applied at these points. We describe how such a frequency-dependent antipodal
correlation and/or response function, which should be measurable in new
AFM-based microrheology experiments, can probe the viscoelasticity of these
synthetic and biological shells constructed of nanoparticles.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 02:22:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kuriabova",
"Tatiana",
""
],
[
"Levine",
"Alex",
""
]
] |
0706.2215 | Qing-Guo Huang | Qing-Guo Huang | Constraints on the spectral index for the inflation models in string
landscape | 5 pages, 1 figure; refs added, version for publication in Phys.Rev.D
(rapid communication) | Phys.Rev.D76:061303,2007 | 10.1103/PhysRevD.76.061303 | null | hep-th astro-ph | null | We conjecture that the inflation models with trans-Planckian excursions in
the field space should be in the swampland. We check this conjecture in a few
examples and investigate the constraints on the spectral index for the
slow-roll inflation model in string landscape where the variation of inflaton
during the period of inflation is less than the Planck scale $M_p$. A red
primordial power spectrum with a lower bound on the spectral index is
preferred. Both the tensor-scalar ratio and the running can be ignored.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 02:36:44 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Aug 2007 23:08:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Huang",
"Qing-Guo",
""
]
] |
0706.2216 | Sang Pyo Kim | Sang Pyo Kim (Kunsan Nat'l Univ.), Hyun Kyu Lee (Hanyang Univ.) | Schwinger Pair Production at Finite Temperature in Scalar QED | RevTex 10 pages, no figure; replaced by the version accepted in Phys.
Rev. D; references corrected | Phys.Rev.D76:125002,2007 | 10.1103/PhysRevD.76.125002 | null | hep-th | null | In scalar QED we study the Schwinger pair production from an initial ensemble
of charged bosons when an electric field is turned on for a finite period
together with or without a constant magnetic field. The scalar QED Hamiltonian
depends on time through the electric field, which causes the initial ensemble
of bosons to evolve out of equilibrium. Using the Liouville-von Neumann method
for the density operator and quantum states for each momentum mode, we
calculate the Schwinger pair-production rate at finite temperature, which is
the pair-production rate from the vacuum times a thermal factor of the
Bose-Einstein distribution.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:43:18 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Oct 2007 02:17:02 GMT"
},
{
"version": "v3",
"created": "Thu, 20 Dec 2007 06:48:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kim",
"Sang Pyo",
"",
"Kunsan Nat'l Univ."
],
[
"Lee",
"Hyun Kyu",
"",
"Hanyang Univ."
]
] |
0706.2217 | Kou Takubo | K. Takubo, T. Mizokawa, J.-Y. Son, Y. Nambu, K. Onuma, H. Tonomura, S.
Nakatsuji, and Y. Maeno | Unusual superexchange pathways in a Ni triangular lattice of
NiGa$_2$S$_4$ with negative charge-transfer energy | 10 pages, 5 figures, accepted to PRL | Phys. Rev. Lett. 99, 037203 (2007) | 10.1103/PhysRevLett.99.037203 | null | cond-mat.str-el | null | We have studied the electronic structure of the Ni triangular lattice in
NiGa$_2$S$_4$ using photoemission spectroscopy and subsequent model
calculations. The cluster-model analysis of the Ni 2$p$ core-level spectrum
shows that the S 3$p$ to Ni 3$d$ charge-transfer energy is $\sim$ -1 eV and the
ground state is dominated by the $d^9L$ configuration ($L$ is a S 3$p$ hole).
Cell perturbation analysis for the NiS$_2$ triangular lattice indicates that
the strong S 3$p$ hole character of the ground state provides the enhanced
superexchange interaction between the third nearest neighbor sites.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 04:29:20 GMT"
},
{
"version": "v2",
"created": "Sat, 16 Jun 2007 16:42:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Takubo",
"K.",
""
],
[
"Mizokawa",
"T.",
""
],
[
"Son",
"J. -Y.",
""
],
[
"Nambu",
"Y.",
""
],
[
"Onuma",
"K.",
""
],
[
"Tonomura",
"H.",
""
],
[
"Nakatsuji",
"S.",
""
],
[
"Maeno",
"Y.",
""
]
] |
0706.2218 | Andrei Bodrenko | Andrei Bodrenko | The analog of the Schauder inequality for closed surfaces in Euclidean
spaces | null | null | null | null | math.DG math.AP | null | The analog of the Schauder inequality for closed surfaces in Euclidean spaces
is obtained in this article.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 04:40:57 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Bodrenko",
"Andrei",
""
]
] |
0706.2219 | Nikolai Moshchevitin | Anna A. Dushistova, Nikolai G. Moshchevitin | On the derivative of the Minkowski question mark function $?(x)$ | 10 pages, submitted to Discrete Mathematics and Applications, minor
correction of misprints | null | null | null | math.NT | null | Let $ x = [0;a_1,a_2,...]$ be the decomposition of the irrational number $x
\in [0,1]$ into regular continued fraction. Then for the derivative of the
Minkowski function $?(x)$ we prove that $?'(x) = +\infty$ provided $
\limsup_{t\to \infty}\frac{a_1+...+a_t}{t} <\kappa_1 =\frac{2\log
\lambda_1}{\log 2} = 1.388^+$, and $?'(x) = 0$ provided $ \liminf_{t\to
\infty}\frac{a_1+...+a_t}{t} >\kappa_2 = \frac{4L_5-5L_4}{L_5-L_4}= 4.401^+$
(here $ L_j = \log (\frac{j+\sqrt{j^2+4}}{2}) - j\cdot\frac{\log 2}{2}$).
Constants $\kappa_1,\kappa_2$ are the best possible. Also we prove that $?'(x)
= +\infty$ holds for all $x$ with partial quotients bounded by 4.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:32:28 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Dec 2007 17:30:07 GMT"
}
] | 2007-12-17T00:00:00 | [
[
"Dushistova",
"Anna A.",
""
],
[
"Moshchevitin",
"Nikolai G.",
""
]
] |
0706.2220 | Kou Takubo | K. Takubo, J.-Y. Son, T. Mizokawa, N. Takubo, and K. Miyano | Observation of photoinduced phase transition in phase-separated
Pr$_{0.55}$(Ca$_{1-y}$Sr$_{y}$)$_{0.45}$MnO$_3$ thin films via x-ray
photoemission spectroscopy | 10 pages, 4 figures | Phys. Rev. B 75, 052408 (2007) | 10.1103/PhysRevB.75.052408 | null | cond-mat.str-el | null | Perovskite manganite thin films, $Pr_{0.55}(Ca_{1-y}Sr_y)_{0.45}MnO_3$, have
been studied using x-ray photoemission spectroscopy in order to clarify the
consequence of the competition between ferromagnetic metal (FM) and
charge-orbital ordered insulator (COOI). Films with $y$ = 0.40 undergo uniform
paramagnetic insulator to FM transition. On the other hand, in films with $y$ =
0.25, the composition near the bicritical point, phase separation of COOI and
FM domains is indicated by the spectral change below 125 K. Interestingly,
between 50 K and 70 K, the visible laser illumination transfers the COOI-like
spectra obtained in cooling process to the FM-like spectra obtained in warming
process. This indicates that the photoinduced IMT is governed by the increase
of the FM volume fraction and is deeply related to the phase separation between
the FM and COOI states.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 04:56:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Takubo",
"K.",
""
],
[
"Son",
"J. -Y.",
""
],
[
"Mizokawa",
"T.",
""
],
[
"Takubo",
"N.",
""
],
[
"Miyano",
"K.",
""
]
] |
0706.2221 | Banibrata Mukhopadhyay | Shubhrangshu Ghosh and Banibrata Mukhopadhyay | Generalized pseudo-Newtonian potential for studying accretion disk
dynamics in off-equatorial planes around rotating black holes: Description of
a vector potential | 22 AASTeX pages including 5 postscript figures; Accepted for
publication in The Astrophysical Journal | Astrophys.J.667:367-374,2007 | 10.1086/520920 | null | astro-ph gr-qc | null | We prescribe a pseudo-Newtonian vector potential for studying accretion disks
around Kerr black holes. The potential is useful to study the inner properties
of disk not confined to the equatorial plane where general relativistic effect
is indispensable. Therefore, we incorporate the essential properties of the
metric at the inner radii through the pseudo-Newtonian potential derived from
the general Kerr spacetime. The potential, reproducing most of the salient
features of the general-relativity, is valid for entire regime of Kerr
parameter. It reproduces the last stable circular orbit exactly as that in the
Kerr geometry. It also reproduces last bound orbit and energy at last stable
circular orbit with a maximum error ~7% and ~15% respectively upto an orbital
inclination 30 degree.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 05:14:53 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ghosh",
"Shubhrangshu",
""
],
[
"Mukhopadhyay",
"Banibrata",
""
]
] |
0706.2222 | Jae Sik Lee | Jae Sik Lee | LHC Signatures of MSSM Higgs-sector CP Violation | 6 pages, 3 figures, invited talk given at the CTP Symposium on
Supersymmetry at LHC: Theoretical and Experimental Perspectives, the British
University in Egypt, 11-14 March 2007 (to appear in the proceedings) | null | null | null | hep-ph | null | We discuss a few new characteristic features of the loop-induced MSSM
Higgs-sector CP violation at the LHC based on two scenarios: (i) CPX and (ii)
Trimixing.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 12:28:20 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Lee",
"Jae Sik",
""
]
] |
0706.2223 | Marcos Kiwi | Marcos Kiwi, Martin Loebl | Towards the Distribution of the Size of a Largest Planar Matching and
Largest Planar Subgraph in Random Bipartite Graphs | 19 pages, 8 figures | null | null | null | math.CO math.PR | null | We address the following question: When a randomly chosen regular bipartite
multi--graph is drawn in the plane in the ``standard way'', what is the
distribution of its maximum size planar matching (set of non--crossing disjoint
edges) and maximum size planar subgraph (set of non--crossing edges which may
share endpoints)? The problem is a generalization of the Longest Increasing
Sequence (LIS) problem (also called Ulam's problem). We present combinatorial
identities which relate the number of r-regular bipartite multi--graphs with
maximum planar matching (maximum planar subgraph) of at most d edges to a
signed sum of restricted lattice walks in Z^d, and to the number of pairs of
standard Young tableaux of the same shape and with a ``descend--type''
property. Our results are obtained via generalizations of two combinatorial
proofs through which Gessel's identity can be obtained (an identity that is
crucial in the derivation of a bivariate generating function associated to the
distribution of LISs, and key to the analytic attack on Ulam's problem).
We also initiate the study of pattern avoidance in bipartite multigraphs and
derive a generalized Gessel identity for the number of bipartite 2-regular
multigraphs avoiding a specific (monotone) pattern.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 05:38:37 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Kiwi",
"Marcos",
""
],
[
"Loebl",
"Martin",
""
]
] |
0706.2224 | Anne Schilling | Masato Okado and Anne Schilling | Existence of Kirillov-Reshetikhin crystals for nonexceptional types | 23 pages; version that appeared in Representation Theory and erratum
added | Represent.Theory12:186-207,2008 | 10.1090/S1088-4165-08-00329-4 | null | math.QA math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the methods of Kang et al. and recent results on the characters of
Kirillov-Reshetikhin modules by Nakajima and Hernandez, the existence of
Kirillov-Reshetikhin crystals B^{r,s} is established for all nonexceptional
affine types. We also prove that the crystals B^{r,s} of type B_n^{(1)},
D_n^{(1)}, and A_{2n-1}^{(2)} are isomorphic to recently constructed
combinatorial crystals for r not a spin node.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 05:46:13 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Aug 2007 23:11:39 GMT"
},
{
"version": "v3",
"created": "Wed, 5 Mar 2008 02:44:50 GMT"
},
{
"version": "v4",
"created": "Tue, 11 Nov 2008 00:28:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Okado",
"Masato",
""
],
[
"Schilling",
"Anne",
""
]
] |
0706.2225 | Chris Engelbrecht | F. A. M. Frescura (1), C. A. Engelbrecht (2), B. S. Frank (1) ((1)
University of the Witwatersrand, (2) University of Johannesburg) | Significance Tests for Periodogram Peaks | 22 pages, 11 Encapsulated Postscript figures, AAS LaTeX v5.2
Submitted to ApJ | null | 10.1016/j.icarus.2012.06.015 | null | astro-ph | null | We discuss methods currently in use for determining the significance of peaks
in the periodograms of time series. We discuss some general methods for
constructing significance tests, false alarm probability functions, and the
role played in these by independent random variables and by empirical and
theoretical cumulative distribution functions. We also discuss the concept of
"independent frequencies" in periodogram analysis. We propose a practical
method for estimating the significance of periodogram peaks, applicable to all
time series irrespective of the spacing of the data. This method, based on
Monte Carlo simulations, produces significance tests that are tailor-made for
any given astronomical time series.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 06:22:56 GMT"
}
] | 2012-07-11T00:00:00 | [
[
"Frescura",
"F. A. M.",
""
],
[
"Engelbrecht",
"C. A.",
""
],
[
"Frank",
"B. S.",
""
]
] |
0706.2226 | Simon Devitt Mr | Simon J. Devitt, Andrew D. Greentree, Radu Ionicioiu, Jeremy L.
O'Brien, William J. Munro and Lloyd C.L. Hollenberg | The Photonic Module: an on-demand resource for photonic entanglement | 8 pages, 2 figures, revised version. Simplified design for the module
in both free-space and photonic crystals, new co-authors added. Accepted in
PRA | Phys. Rev. A. 76, 052312 (2007) | 10.1103/PhysRevA.76.052312 | null | quant-ph | null | Photonic entanglement has a wide range of applications in quantum computation
and communication. Here we introduce a new device: the "photonic module", which
allows for the rapid, deterministic preparation of a large class of entangled
photon states. The module is an application independent, "plug and play"
device, with sufficient flexibility to prepare entanglement for all major
quantum computation and communication applications in a completely
deterministic fashion without number-discriminated photon detection. We present
two alternative constructions for the module, one using free-space components
and one in a photonic bandgap structures. The natural operation of the module
is to generate states within the stabilizer formalism and we present an
analysis on the cavity-QED requirements to experimentally realize this device.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 06:21:06 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Oct 2007 02:08:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Devitt",
"Simon J.",
""
],
[
"Greentree",
"Andrew D.",
""
],
[
"Ionicioiu",
"Radu",
""
],
[
"O'Brien",
"Jeremy L.",
""
],
[
"Munro",
"William J.",
""
],
[
"Hollenberg",
"Lloyd C. L.",
""
]
] |
0706.2227 | Patrick Woudt | P.A. Woudt (UCT), R.C. Kraan-Korteweg (UCT), J. Lucey (Durham), A.P.
Fairall (UCT), S.A.W. Moore (Durham) | The Norma Cluster (ACO 3627): I. A Dynamical Analysis of the Most
Massive Cluster in the Great Attractor | Sumbitted to MNRAS. 13 pages, 11 figures. Figures 6 and 10 reduced in
resolution. Original available on request | null | 10.1111/j.1365-2966.2007.12571.x | null | astro-ph | null | A detailed dynamical analysis of the nearby rich Norma cluster (ACO 3627) is
presented. From radial velocities of 296 cluster members, we find a mean
velocity of 4871 +/- 54 km/s and a velocity dispersion of 925 km/s. The mean
velocity of the E/S0 population (4979 +/- 85 km/s) is offset with respect to
that of the S/Irr population (4812 +/- 70 km/s) by `Delta' v = 164 km/s in the
cluster rest frame. This offset increases towards the core of the cluster. The
E/S0 population is free of any detectable substructure and appears relaxed. Its
shape is clearly elongated with a position angle that is aligned along the
dominant large-scale structures in this region, the so-called Norma wall. The
central cD galaxy has a very large peculiar velocity of 561 km/s which is most
probably related to an ongoing merger at the core of the cluster. The
spiral/irregular galaxies reveal a large amount of substructure; two
dynamically distinct subgroups within the overall spiral-population have been
identified, located along the Norma wall elongation. The dynamical mass of the
Norma cluster within its Abell radius is 1 - 1.1 x 10^15 h^-1_73 M_Sun. One of
the cluster members, the spiral galaxy WKK 6176 which recently was observed to
have a 70 kpc X-ray tail, reveals numerous striking low-brightness filaments
pointing away from the cluster centre suggesting strong interaction with the
intracluster medium.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 06:51:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Woudt",
"P. A.",
"",
"UCT"
],
[
"Kraan-Korteweg",
"R. C.",
"",
"UCT"
],
[
"Lucey",
"J.",
"",
"Durham"
],
[
"Fairall",
"A. P.",
"",
"UCT"
],
[
"Moore",
"S. A. W.",
"",
"Durham"
]
] |
0706.2228 | Mikhail Zaidenberg | Mikhail Zaidenberg (IF) | Periodic harmonic functions on lattices and points count in positive
characteristic | These are notes on 13p. based on a talk presented during the meeting
"Analysis on Graphs and Fractals", the Cardiff University, 29 May-2 June 2007
(a sattelite meeting of the programme "Analysis on Graphs and its
Applications" at the Isaac Newton Institute from 8 January to 29 June 2007) | Central European Journal of Mathematics 7, 3 (2009) 365-381 | 10.2478/s11533-009-0029-0 | null | math.AG math.SP | null | This survey addresses pluri-periodic harmonic functions on lattices with
values in a positive characteristic field. We mention, as a motivation, the
game "Lights Out" following the work of Sutner, Goldwasser-Klostermeyer-Ware,
Barua-Ramakrishnan-Sarkar, Hunzikel-Machiavello-Park e.a.; see also 2 previous
author's preprints for a more detailed account. Our approach explores harmonic
analysis and algebraic geometry over a positive characteristic field. The
Fourier transform allows us to interpret pluri-periods of harmonic functions on
lattices as torsion multi-orders of points on the corresponding affine
algebraic variety.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 06:44:46 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Dec 2007 13:34:07 GMT"
}
] | 2009-10-19T00:00:00 | [
[
"Zaidenberg",
"Mikhail",
"",
"IF"
]
] |
0706.2229 | Huaxin Lin | Huaxin Lin | AF-embedding of the crossed products of AH-algebras by finitely
generated abelian groups | 46 pages | null | null | null | math.OA math.FA | null | Let $X$ be a compact metric space and let $\Lambda$ be a $\Z^k$ ($k\ge 1$)
action on $X.$ We give a solution to a version of Voiculescu's problem of
AF-embedding: The crossed product $C(X)\rtimes_{\Lambda}\Z^k$ can be embedded
into a unital simple AF-algebra if and only if $X$ admits a strictly positive
$\Lambda$-invariant Borel probability measure.
Let $C$ be a unital AH-algebra, let $G$ be a finitely generated abelian group
and let $\Lambda: G\to Aut(C)$ be a monomorphism. We show that
$C\rtimes_{\Lambda} G$ can be embedded into a unital simple AF-algebra if and
only if $C$ admits a faithful $\Lambda$-invariant tracial state.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 06:53:37 GMT"
},
{
"version": "v2",
"created": "Sun, 17 Jun 2007 02:30:37 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Lin",
"Huaxin",
""
]
] |
0706.2230 | Jussi Kumpula | J. M. Kumpula, J. Saramaki, K. Kaski, J. Kertesz | Limited resolution and multiresolution methods in complex network
community detection | 6 pages, 2 figures.Minor changes from previous version, shortened a
couple of pages | Fluctuations and Noise Letters Vol. 7, No. 3 (2007), 209-214 | 10.1117/12.725560 | null | physics.soc-ph | null | Detecting community structure in real-world networks is a challenging
problem. Recently, it has been shown that the resolution of methods based on
optimizing a modularity measure or a corresponding energy is limited;
communities with sizes below some threshold remain unresolved. One possibility
to go around this problem is to vary the threshold by using a tuning parameter,
and investigate the community structure at variable resolutions. Here, we
analyze the resolution limit and multiresolution behavior for two different
methods: a q-state Potts method proposed by Reichard and Bornholdt, and a
recent multiresolution method by Arenas, Fernandez, and Gomez. These methods
are studied analytically, and applied to three test networks using simulated
annealing.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 07:00:29 GMT"
},
{
"version": "v2",
"created": "Fri, 25 Jan 2008 14:05:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kumpula",
"J. M.",
""
],
[
"Saramaki",
"J.",
""
],
[
"Kaski",
"K.",
""
],
[
"Kertesz",
"J.",
""
]
] |
0706.2231 | Denis Epifanov A | Belle Collaboration | Study of tau- -> K_S pi- nu_tau decay at Belle | 19 pages, 8 figures, submitted to Phys. Lett. B | Phys.Lett.B654:65-73,2007 | 10.1016/j.physletb.2007.08.045 | Belle Preprint 2007-28, KEK Preprint 2007-17 | hep-ex | null | We present a study of the decay tau- -> K_S pi- nu_tau using a 351 fb^-1 data
sample collected with the Belle detector. The analysis is based on 53110
lepton-tagged signal events. The measured branching fraction B(tau- -> K_S pi-
nu_tau)=(0.404 +- 0.002(stat.) +- 0.013(syst.))% is consistent with the world
average value and has better accuracy. An analysis of the K_S pi- invariant
mass spectrum reveals contributions from the K*(892)- as well as other states.
For the first time the K*(892)- mass and width have been measured in tau decay:
M(K*(892)-)=(895.47 +- 0.20(stat.) +- 0.44(syst.) +- 0.59(mod.)) MeV/c2,
Gamma(K*(892)-)=(46.2 +- 0.6(stat.) +- 1.0(syst.) +- 0.7(mod.)) MeV. The
K*(892)- mass is significantly different from the current world average value.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 07:05:33 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"Belle Collaboration",
"",
""
]
] |
0706.2232 | Evgeny Volkov | Evgeny Volkov | Characterization of intrinsically harmonic forms | 8 pages | null | 10.1112/jtopol/jtn014 | null | math.DG | null | Let $M$ be a closed oriented manifold of dimension $n$ and $\omega$ a closed
1-form on it. We discuss the question whether there exists a Riemannian metric
for which $\omega$ is co-closed. For closed 1-forms with nondegenerate zeros
the question was answered completely by Calabi in 1969. The goal of this paper
is to give an answer in the general case, i.e. not making any assumptions on
the zero set of $\omega$.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 07:07:31 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Volkov",
"Evgeny",
""
]
] |
0706.2233 | Jianke Yang | Jiandong Wang, Jianke Yang, and Zhigang Chen | Two-dimensional defect modes in optically induced photonic lattices | 17 pages, 10 figures, to appear in Phys. Rev. A | null | 10.1103/PhysRevA.76.013828 | null | physics.optics | null | In this article, localized linear defect modes due to bandgap guidance in
two-dimensional photonic lattices with localized or non-localized defects are
investigated theoretically. First, when the defect is localized and weak,
eigenvalues of defect modes bifurcated from edges of Bloch bands are derived
analytically. It is shown that in an attractive (repulsive) defect, defect
modes bifurcate out from Bloch-band edges with normal (anomalous) diffraction
coefficients. Furthermore, distances between defect-mode eigenvalues and
Bloch-band edges are exponentially small functions of the defect strength,
which is very different from the one-dimensional case where such distances are
quadratically small with the defect strength. It is also found that some
defect-mode branches bifurcate not from Bloch-band edges, but from quasi-edge
points within Bloch bands, which is very unusual. Second, when the defect is
localized but strong, defect modes are determined numerically. It is shown that
both the repulsive and attractive defects can support various types of defect
modes such as fundamental, dipole, quadrupole, and vortex modes. These modes
reside in various bandgaps of the photonic lattice. As the defect strength
increases, defect modes move from lower bandgaps to higher ones when the defect
is repulsive, but remain within each bandgap when the defect is attractive,
similar to the one-dimensional case. The same phenomena are observed when the
defect is held fixed while the applied dc field (which controls the lattice
potential) increases. Lastly, if the defect is non-localized (i.e. it persists
at large distances in the lattice), it is shown that defect modes can be
embedded inside the continuous spectrum, and they can bifurcate out from edges
of the continuous spectrum algebraically rather than exponentially.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 07:46:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"Jiandong",
""
],
[
"Yang",
"Jianke",
""
],
[
"Chen",
"Zhigang",
""
]
] |
0706.2234 | Nicolas Lodieu | N. Lodieu (1 and 2), P. D. Dobbie (3 and 2), N. R. Deacon (4), S. T.
Hodgkin (5), N. C. Hambly (6), R. F. Jameson (2) ((1) IAC, Tenerife, (2)
Leicester, UK, (3) AAO, Australia, (4) Radboud University Nijmegen, (5) IoA,
Cambridge, UK, (6) SUPA, ROE, Edinburgh, UK) | A wide deep infrared look at the Pleiades with UKIDSS: new constraints
on the substellar binary fraction and the low mass IMF | 21 pages, 8 figures, 6 tables, 1 electronic table, 6 appendices with
tables, accepted to MNRAS | Mon.Not.Roy.Astron.Soc.380:712-732,2007 | 10.1111/j.1365-2966.2007.12106.x | null | astro-ph | null | We present the results of a deep wide-field near-infrared survey of 12 square
degrees of the Pleiades conducted as part of the UKIDSS Deep Infrared Sky
Survey (UKIDSS) Galactic Cluster Survey (GCS). We have extracted over 340 high
probability proper motion members down to 0.03 solar masses using a combination
of UKIDSS photometry and proper motion measurements obtained by
cross-correlating the GCS with data from the Two Micron All Sky Survey (2MASS),
the Isaac Newton (INT) and the Canada-France-Hawai'i (CFHT) telescopes.
Additionally, we have unearthed 73 new candidate brown dwarf members on the
basis of five band UKIDSS photometry alone. We have identified 23 substellar
multiple system candidates out of 63 candidate brown dwarfs from the (Y-K,Y)
and (J-K,J) colour-magnitude diagrams, yielding a binary frequency of 28-44% in
the 0.075-0.030 Msun mass range. Our estimate is three times larger than the
binary fractions reported from high-resolution imaging surveys of field
ultracool dwarfs and Pleiades brown dwarfs. However, it is marginally
consistent with our earlier ``peculiar'' photometric binary fraction of
50+/-10% presented in Pinfield et al. (2003), in good agreement with the 32-45%
binary fraction derived from the recent Monte-Carlo simulations of Maxted &
Jeffries (2005) and compatible with the 26+/-10% frequency recently estimated
by Basri & Reiners (2006). A tentative estimate of the mass ratios from
photometry alone seems to support the hypothesis that binary brown dwarfs tend
to reside in near equal-mass ratio systems. (abridged)
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 07:52:15 GMT"
}
] | 2011-03-10T00:00:00 | [
[
"Lodieu",
"N.",
"",
"1 and 2"
],
[
"Dobbie",
"P. D.",
"",
"3 and 2"
],
[
"Deacon",
"N. R.",
""
],
[
"Hodgkin",
"S. T.",
""
],
[
"Hambly",
"N. C.",
""
],
[
"Jameson",
"R. F.",
""
]
] |
0706.2235 | Guido Pizzella | P.Galeotti and G.Pizzella | Sn1987a Revisited after 20 Years: May the Supernova Bang More Than Once? | presented at the XII-th International Workshop on Neutrino Telescope,
Venice, 6-9 March 2007 | null | null | null | gr-qc astro-ph | null | The observations of supernova 1987A in underground detectors are revisited.
It is shown that, while the LSD detector in the Mont Blanc Laboratory observed
only one burst at 2h 52min 36.8sec U.T., the Kamiokande data show a possible
second burst, in addition to the well known one at 7h 35min 33.7sec U.T. This
second burst consists of a cluster of seven pulses, well above the energy
threshold of the detector, observed during 6.2 seconds starting at 7h 54min
22.2sec U.T. Do these observations imply a long duration of the collapse?
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 07:56:53 GMT"
}
] | 2007-06-19T00:00:00 | [
[
"Galeotti",
"P.",
""
],
[
"Pizzella",
"G.",
""
]
] |
0706.2236 | Hank Miller | R. C. Andrew, H. G. Miller and G. D. Yen | Solution of the Dirac Equation using the Lanczos Algorithm | null | null | null | null | math-ph math.GM math.MP | null | Covergent eigensolutions of the Dirac Equation for a relativistic electron in
an external Coulomb potential are obtained using the Lanczos Algorithm. A
tri-diagonal matrix representation of the Dirac Hamiltonian operator is
constructed iteratively and diagonalized after each iteration step to form a
sequence of convergent eigenvalue solutions. Any spurious solutions which arise
from the presence of continuum states can easily be identified.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 07:58:25 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Andrew",
"R. C.",
""
],
[
"Miller",
"H. G.",
""
],
[
"Yen",
"G. D.",
""
]
] |
0706.2237 | Grigoris Panotopoulos | Grigoris Panotopoulos | A brief note on how to unify dark matter, dark energy, and inflation | To appear in Phys.Rev.D | Phys.Rev.D75:127301,2007 | 10.1103/PhysRevD.75.127301 | null | hep-ph | null | A scenario in which inflation, dark energy and dark matter can be unified
into a single scalar field, the inflaton field $\phi$, is studied. The inflaton
is identified with the sneutrino, the scalar partner of the heavy neutrino. We
determine the conditions needed for avoiding the gravitino problem and not
having negligible plasma effects and we obtain the allowed range for the
sneutrino coupling.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 07:59:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Panotopoulos",
"Grigoris",
""
]
] |
0706.2238 | Shin-Itiro Goto | Shin-itiro Goto | Renormalization Reductions for Systems with Delay | Submitted to Prog. Theor. Phys., 2 figures | null | 10.1143/PTP.118.211 | null | nlin.PS nlin.CD | null | The renormalization method which is a type of perturbation method is extended
to a tool to study weakly nonlinear time-delay systems. For systems with
order-one delay, we show that the renormalization method leads to reduced
systems without delay. For systems with order-one and large-delay, we propose
an extended renormalization method which leads to reduced systems with delay.
In some examples, the validities of our perturbative results are confirmed
analytically and numerically. We also compare our reduced equations with
reduced ones obtained by another perturbation method.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 08:08:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Goto",
"Shin-itiro",
""
]
] |
0706.2239 | Mart\'i Lahoz | Marti Lahoz | Infinitesimal Castelnuovo Theory in Abelian Varieties | The proofs and the results were corrected and improved in
arXiv:1410.4813 | null | null | null | math.AG | null | The purpose of this article is to show that the Castelnuovo theory for
abelian varieties, developed by G. Pareschi and M. Popa, can be
infinitesimalized. More precisely, we prove that an irreducible principally
polarized abelian variety has a finite scheme in extremal position, in the
sense of Castelnuovo theory for abelian varieties, if, and only if, it is a
Jacobian and the scheme is contained in a unique Abel-Jacobi curve.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 08:12:30 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Jan 2021 10:43:10 GMT"
}
] | 2021-01-28T00:00:00 | [
[
"Lahoz",
"Marti",
""
]
] |
0706.2240 | Bing Dong | X. Y. Shen, Bing Dong, X. L. Lei, and N. J. M. Horing | Vibration-mediated resonant tunneling and shot noise through a molecular
quantum dot | 11 pages, 7 figures | Phys. Rev. B 76, 115308 (2007). | 10.1103/PhysRevB.76.115308 | null | cond-mat.mes-hall | null | Motivated by a recent experiment on nonlinear tunneling in a suspended Carbon
nanotube connected to two normal electrodes [S. Sapmaz, {\it et al}., Phys.
Rev. Lett. {\bf 96}, 26801 (2006)], we investigate nonequilibrium
vibration-mediated sequential tunneling through a molecular quantum dot with
two electronic orbitals asymmetrically coupled to two electrodes and strongly
interacting with an internal vibrational mode, which is itself weakly coupled
to a dissipative phonon bath. For this purpose, we establish rate equations
using a generic quantum Langevin equation approach. Based on these equations,
we study in detail the current-voltage characteristics and zero-frequency shot
noise, paying special attention to the advanced or postponed of the appearance
of negative differential conductance and super-Poissonian current noise
resulting from electron-phonon-coupling induced {\em selective unidirectional
cascades of single-electron transitions}.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 08:18:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shen",
"X. Y.",
""
],
[
"Dong",
"Bing",
""
],
[
"Lei",
"X. L.",
""
],
[
"Horing",
"N. J. M.",
""
]
] |
0706.2241 | Stefano Portolan | S. Portolan (1,3), O. Di Stefano (2), S. Savasta (2), F. Rossi (3), R.
Girlanda (2), ((1) Institute of Theoretical Physics, Ecole Polytechnique
F\'ed\'erale de Lausanne EPFL, Switzerland, (2) Dipartimento di Fisica della
Materia e Tecnologie Fisiche Avanzate, Universit\`a di Messina, Italy, (3)
Dipartimento di Fisica, Politecnico di Torino, Italy) | Dynamics-Controlled Truncation Scheme for Nonlinear Dynamics in
Semiconductor Microcavities | preprint version, no figures an entire section added | null | 10.1103/PhysRevB.77.195305 | null | cond-mat.mes-hall | null | We present a systematic theory of Coulomb-induced correlation effects in the
nonlinear optical processes within the strong-coupling regime. In this paper we
shall set a dynamics controlled truncation scheme \cite{Axt Stahl} microscopic
treatment of nonlinear parametric processes in SMCs including the
electromagnetic field quantization. It represents the starting point for the
microscopic approach to quantum optics experiments in the strong coupling
regime without any assumption on the quantum statistics of electronic
excitations (excitons) involved. We exploit a previous technique, used in the
semiclassical context, which, once applied to four-wave mixing in quantum
wells, allowed to understand a wide range of observed phenomena \cite{Sham
PRL95}. We end up with dynamical equations for exciton and photon operators
which extend the usual semiclassical description of Coulomb interaction
effects, in terms of a mean-field term plus a genuine non-instantaneous
four-particle correlation, to quantum optical effects.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 08:36:08 GMT"
},
{
"version": "v2",
"created": "Tue, 16 Oct 2007 15:31:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Portolan",
"S.",
""
],
[
"Di Stefano",
"O.",
""
],
[
"Savasta",
"S.",
""
],
[
"Rossi",
"F.",
""
],
[
"Girlanda",
"R.",
""
]
] |
0706.2242 | Markus Diefenthaler | Markus Diefenthaler | HERMES measurements of Collins and Sivers asymmetries from a
transversely polarised hydrogen target | To appear in the proceedings of the 15th International Workshop on
Deep Inelastic Scattering (DIS 07), Munich, Germany | null | null | null | hep-ex | null | Azimuthal single-spin asymmetries (SSA) in semi-inclusive electroproduction
of pi-mesons and charged K-mesons in deep-inelastic scattering of positrons and
electrons on a transversely polarised hydrogen target were observed.
Significant SSA amplitudes for both the Collins and the Sivers mechanism are
presented for the full data set recorded with transverse target polarisation at
the HERMES experiment.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 08:33:44 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Jun 2007 09:59:42 GMT"
}
] | 2007-06-19T00:00:00 | [
[
"Diefenthaler",
"Markus",
""
]
] |
0706.2243 | Dr. Thomas Rauch | Thomas Rauch (Institut fuer Astronomie und Astrophysik, Tuebingen,
Germany) | GAVO Tools for the Analysis of Stars and Nebulae | 4 pages, 3 figures | null | null | null | astro-ph | null | Within the framework of the German Astrophysical Virtual Observatory (GAVO),
we provide synthetic spectra, simulation software for the calculation of NLTE
model atmospheres, as well as necessary atomic data. This will enable a VO user
to directly compare observation and model-atmosphere spectra on three levels:
The easiest and fastest way is the use of our pre-calculated flux-table grid in
which one may inter- and extrapolate. For a more precise analysis of an
abservation, the VO user may improve the fit to the observation by the
calculation of individual model atmospheres with fine-tuned photospheric
parameters via the WWW interface TMAW. The more experienced VO user may create
own atomic-data files for a more detailed analysis and calculate model
atmosphere and flux tables with these.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 08:53:26 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Rauch",
"Thomas",
"",
"Institut fuer Astronomie und Astrophysik, Tuebingen,\n Germany"
]
] |
0706.2244 | Birgitte Freiesleben de Blasio | Birgitte Freiesleben de Blasio, Odd O Aalen | The Yule distribution and frailty--a note on spurious preferential
attachment | 28 pages; 5 figures | null | null | null | physics.soc-ph | null | Preferential attachment is a popular generative mechanism to explain the
widespread observation of power law distributed networks. We introduce an
alternative explanation for the phenomenon by allowing the link growth rates to
vary across the nodes according to a randomized Poisson process. The
distribution of rates, which reproduces the degree distribution of a
preferential attachment process (Yule process) is derived analytically. We
demonstrate with use of simulations that the degree distribution and growth
rates in single time intervals are similar for the random process and the
preferential attachment process. Structural differences are analyzed by
examining the joint degree distribution and network coreness.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 08:44:30 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"de Blasio",
"Birgitte Freiesleben",
""
],
[
"Aalen",
"Odd O",
""
]
] |
0706.2245 | Dr. Thomas Rauch | Thomas Rauch, Klaus Werner (Institut fuer Astronomie und Astrophysik,
Tuebingen, Germany) | HST Spectroscopy of the Hottest White Dwarfs | 4 pages, 1 figure | null | null | null | astro-ph | null | Spectral analysis needs the observation of lines of successive ionization
stages in order to evaluate the ionization equilibrium (of a particular
species) which is a sensitive indicator for the effective temperature. Since
stars with effective temperatures as high as 100000 K have their flux maximum
in the extreme ultraviolet (EUV) wavelength range and due to the high degree of
ionization, most of the metal lines are found in the ultraviolet (UV) range.
Thus, high-S/N and high-resolution UV spectra are a pre-requisite for a precise
analysis. Consequently, we employed the Faint Object Spectrograph (FOS), the
Goddard High Resolution Spectrograph (GHRS), and the Space Telescope Imaging
Spectrograph (STIS) aboard the Hubble Space Telescope (HST) in order to obtain
suitable data. We present state-of-the-art analyses of the hottest (pre-) white
dwarfs by means of NLTE model atmospheres which include the metal-line
blanketing of all elements from hydrogen to nickel.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 09:01:56 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Rauch",
"Thomas",
"",
"Institut fuer Astronomie und Astrophysik,\n Tuebingen, Germany"
],
[
"Werner",
"Klaus",
"",
"Institut fuer Astronomie und Astrophysik,\n Tuebingen, Germany"
]
] |
0706.2246 | Saleh Naqib | S. H. Naqib | Effect of Zn substitution on the suppression of Tc of
Y1-xCaxBa2(Cu1-yZny)3O7-delta superconductors: pseudogap and the systematic
shift of the optimum hole content | Replacement with some minor corrections | null | 10.1088/0953-2048/20/10/012 | null | cond-mat.supr-con | null | The effect of Zn substitution on the superconducting transition temperature,
Tc, was investigated for the sintered Y1-xCaxBa2(Cu1-yZny)3O7-delta compounds
over a wide range of hole concentration per CuO2 plane, p. Ca substitution
enabled us to study the deeply overdoped region. p was changed by changing the
oxygen deficiency (delta). A strongly p-dependent rate of suppression of Tc
with Zn (dTc/dy) was found. From the analysis of the dTc(p)/dy and Tc(p,y)
data, we found that the optimum hole content, popt, shifts to higher values
with increasing Zn and superconductivity is at its strongest when p = 0.185 +/-
0.005. Various complementary experiments have identified this as the hole
content where the pseudogap vanishes quite abruptly. We have discussed the
possible relevance to these ideas with our findings.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 09:03:28 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Jun 2007 07:27:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Naqib",
"S. H.",
""
]
] |
0706.2247 | Emmanuel Wagner | Emmanuel Wagner | A refinement of Khovanov-Rozansky link homology | This paper has been withdrawn | null | null | null | math.GT math.QA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper has been withdrawn by the author due to an error in the proof of
Theorem 1.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 09:10:28 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Mar 2009 14:48:17 GMT"
}
] | 2009-03-30T00:00:00 | [
[
"Wagner",
"Emmanuel",
""
]
] |
0706.2248 | V. M. Krasnov | V.M.Krasnov, T.Golod, T.Bauch, and P.Delsing | Anticorrelation between temperature and fluctuations in moderately
damped Josephson junctions | 17 pages, 20 figures | Physical Review B 76, 224517 (2007) | 10.1103/PhysRevB.76.224517 | null | cond-mat.supr-con | null | We study the influence of dissipation on the switching current statistics of
moderately damped Josephson junctions. Different types of both low- and high-
$T_c$ junctions with controlled damping are studied. The damping parameter of
the junctions is tuned in a wide range by changing temperature, magnetic field,
gate voltage, introducing a ferromagnetic layer or in-situ capacitive shunting.
A paradoxical collapse of switching current fluctuations occurs with increasing
$T$ in all studied junctions. The phenomenon critically depends on dissipation
in the junction and is explained by interplay of two counteracting consequences
of thermal fluctuations, which on the one hand assist in premature switching
into the resistive state and on the other hand help in retrapping back to the
superconducting state. This is one of the rare examples of anticorrelation
between temperature and fluctuation amplitude of a physically measurable
quantity.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 11:28:48 GMT"
}
] | 2011-03-11T00:00:00 | [
[
"Krasnov",
"V. M.",
""
],
[
"Golod",
"T.",
""
],
[
"Bauch",
"T.",
""
],
[
"Delsing",
"P.",
""
]
] |
0706.2249 | Anthony Chefles | Anthony Chefles | Distributed implementation of standard oracle operators | 4.4 pages, Revtex 4. Submitted to Physical Review Letters | null | 10.1103/PhysRevA.78.062304 | null | quant-ph | null | The standard oracle operator corresponding to a function f is a unitary
operator that computes this function coherently, i.e. it maintains
superpositions. This operator acts on a bipartite system, where the subsystems
are the input and output registers. In distributed quantum computation, these
subsystems may be spatially separated, in which case we will be interested in
its classical and entangling capacities. For an arbitrary function f, we show
that the unidirectional classical and entangling capacities of this operator
are log_{2}(n_{f}) bits/ebits, where n_{f} is the number of different values
this function can take. An optimal procedure for bidirectional classical
communication with a standard oracle operator corresponding to a permutation on
Z_{M} is given. The bidirectional classical capacity of such an operator is
found to be 2log_{2}(M) bits. The proofs of these capacities are facilitated by
an optimal distributed protocol for the implementation of an arbitrary standard
oracle operator.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 18:44:30 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Jun 2007 01:47:25 GMT"
},
{
"version": "v3",
"created": "Sat, 7 Jul 2007 21:00:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chefles",
"Anthony",
""
]
] |
0706.2250 | Nitin Nitsure | Nitin Nitsure | Sign lemma for dimension shifting | 7 pages, LaTeX | null | null | null | math.AG math.AT | null | There is a surprising occurrence of some minus signs in the isomorphisms
produced in the well-known technique of dimension shifting in calculating
derived functors in homological algebra. We explicitly determine these signs.
Getting these signs right is important in order to avoid basic contradictions.
We illustrate the lemma by some de Rham cohomology and Chern class
considerations for compact Riemann surfaces.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 09:38:24 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Nitsure",
"Nitin",
""
]
] |
0706.2251 | Michael Hartmann Mr | Michael J. Hartmann, Fernando G.S.L. Brandao and Martin B. Plenio | A polaritonic two-component Bose-Hubbard model | 5 pages, 7 figures | New J. Phys. 10 (2008) 033011 | 10.1088/1367-2630/10/3/033011 | null | quant-ph cond-mat.str-el | null | We show that polaritons in an array of interacting micro-cavities with strong
atom-photon coupling can form a two-component Bose-Hubbard model. Both
polariton species are thereby protected against spontaneous emission as their
atomic part is stored in two ground states of the atoms. The parameters of the
effective model can be tuned via the driving strength of external lasers. We
also describe a method to measure the number statistics in one cavity for each
polariton species independently.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 09:28:56 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Hartmann",
"Michael J.",
""
],
[
"Brandao",
"Fernando G. S. L.",
""
],
[
"Plenio",
"Martin B.",
""
]
] |
0706.2252 | Vishnu Jejjala | Vishnu Jejjala, Michael Kavic, Djordje Minic | Time and M-theory | 86 pages, 5 figures, LaTeX, typos fixed, references added, and Sec.
6.2 revised; invited review for Int. J. Mod. Phys. A | Int.J.Mod.Phys.A22:3317-3405,2007 | 10.1142/S0217751X07036981 | DCPT-07/31, VPI-IPNAS-07-05 | hep-th | null | We review our recent proposal for a background independent formulation of a
holographic theory of quantum gravity. The present review incorporates the
necessary background material on geometry of canonical quantum theory,
holography and spacetime thermodynamics, Matrix theory, as well as our specific
proposal for a dynamical theory of geometric quantum mechanics, as applied to
Matrix theory. At the heart of this review is a new analysis of the conceptual
problem of time and the closely related and phenomenologically relevant problem
of vacuum energy in quantum gravity. We also present a discussion of some
observational implications of this new viewpoint on the problem of vacuum
energy.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 09:45:28 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Jun 2007 15:44:16 GMT"
},
{
"version": "v3",
"created": "Wed, 5 Sep 2007 11:53:23 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Jejjala",
"Vishnu",
""
],
[
"Kavic",
"Michael",
""
],
[
"Minic",
"Djordje",
""
]
] |
0706.2253 | Rainer Heise | Rainer Heise, Harald G Svendsen | A note on fermions in holographic QCD | 21+1 pp, 1 figure; v2: typos corrected, refs. added | JHEP 0708:065,2007 | 10.1088/1126-6708/2007/08/065 | AEI-2007-010 | hep-th | null | We study the fermionic sector of a probe D8-brane in the supergravity
background made of D4-branes compactified on a circle with supersymmetry broken
explicitly by the boundary conditions. At low energies the dual field theory is
effectively four-dimensional and has proved surprisingly successful in
recovering qualitative and quantitative properties of QCD. We investigate
fluctuations of the fermionic fields on the probe D8-brane and interpret these
as mesinos (fermionic superpartners of mesons). We demonstrate that the masses
of these modes are comparable to meson masses and show that their interactions
with ordinary mesons are not suppressed.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 09:58:23 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jun 2007 12:27:15 GMT"
}
] | 2009-11-18T00:00:00 | [
[
"Heise",
"Rainer",
""
],
[
"Svendsen",
"Harald G",
""
]
] |
0706.2254 | Phuong Mai Dinh | P.M. Dinh, F. Fehrer, P.-G. Reinhard, and E. Suraud | Dynamics of cluster deposition on Ar surface | 10 pages, 6 figures, accepted in Euro. Phys. J. D | Euro. Phys. J. D 45 (2007) 415 | 10.1140/epjd/e2007-00225-3 | null | cond-mat.other | null | Using a combined quantum mechanical/classical method, we study the dynamics
of deposition of small Na clusters on Ar(001) surface. We work out basic
mechanisms by systematic variation of substrate activity, impact energy,
cluster orientations, cluster sizes, and charges. The soft Ar material is found
to serve as an extremely efficient shock absorber which provides cluster
capture in a broad range of impact energies. Reflection is only observed in
combination with destruction of the substrate. The kinetic energy of the
impinging cluster is rapidly transfered at first impact. The distribution of
the collision energy over the substrate proceeds very fast with velocity of
sound. The full thermalization of ionic and atomic energies goes at a much
slower pace with times of several ps. Charged clusters are found to have a much
stronger interface interaction and thus get in significantly closer contact
with the surface.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 09:50:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dinh",
"P. M.",
""
],
[
"Fehrer",
"F.",
""
],
[
"Reinhard",
"P. -G.",
""
],
[
"Suraud",
"E.",
""
]
] |
0706.2255 | Ioannis Contopoulos | Ioannis Contopoulos | The magnetic field topology in the reconnecting pulsar magnetosphere | Accepted for publication in Astronomy and Astrophysics | null | 10.1051/0004-6361:20077167 | null | astro-ph | null | We show that toroidal magnetic field annihilation in the equatorial current
sheet of the pulsar magnetosphere is related to how fast poloidal magnetic
field lines close as we move away from the light cylinder. This determines the
reconnection radial electric field which directly accelerates particles in the
neutral layer inside the equatorial current sheet. The efficiency of poloidal
magnetic field closure near the light cylinder may be measurable through the
pulsar braking index. We argue that, the lower the efficiency of pair
formation, the higher the braking index. We also argue that synchrotron
radiation reaction in the neutral layer does not inhibit the accelerated
particles from reaching the maximum energy of about 10^16 eV available in the
open pulsar magnetosphere.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 17:43:37 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jun 2007 11:29:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Contopoulos",
"Ioannis",
""
]
] |
0706.2256 | Dr. Thomas Rauch | T. Rauch (1), M. Ziegler (1), K. Werner (1), J.W. Kruk (2), C.M.
Oliveira (2), D. Vande Putte (3), R.P. Mignani (3), F. Kerber (4) ((1)
Institut fuer Astronomie und Astrophysik, Tuebingen, Germany, (2) Department
of Physics and Astronomy, Johns Hopkins University, Baltimore, U.S.A., (3)
Mullard Space Science Laboratory, University College London, Dorking, United
Kingdom,(4) European Southern Observatory, Garching, Germany) | High-resolution FUSE and HST ultraviolet spectroscopy of the white dwarf
central star of Sh 2-216 | 13 pages, 20 figures | null | 10.1051/0004-6361:20077166 | null | astro-ph | null | LS V +4621 is the DAO-type central star of the planetary nebula Sh 2-216. We
perform a comprehensive spectral analysis of high-resolution, high-S/N
ultraviolet observations obtained with FUSE and STIS aboard the HST as well as
the optical spectrum of LS V +4621 by means of state-of-the-art NLTE
model-atmosphere techniques in order to compare its photospheric properties to
theoretical predictions from stellar evolution theory as well as from diffusion
calculations.
From the N IV - NV, O IV - O VI, Si IV - Si V, and Fe V - Fe VII ionization
equilibria, we determined an effective temperature of 95 +/- 2 kK with high
precision. The surface gravity is log g = 6.9 +/- 0.2. An unexplained
discrepancy appears between the spectroscopic distance d = 224 +46/-58 pc and
the parallax distance d = 129 +6/-5 pc of LS V +4621. For the first time, we
have identified Mg IV and Ar VI absorption lines in the spectrum of a
hydrogen-rich central star and determined the Mg and Ar abundances as well as
the individual abundances of iron-group elements (Cr, Mn, Fe, Co, and Ni). With
the realistic treatment of metal opacities up to the iron group in the
model-atmosphere calculations, the so-called Balmer-line problem (found in
models that neglect metal-line blanketing) vanishes.
Spectral analysis by means of NLTE model atmospheres has presently arrived at
a high level of sophistication, which is now hampered largely by the lack of
reliable atomic data and accurate line-broadening tables. Strong efforts should
be made to improve upon this situation.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 09:55:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rauch",
"T.",
""
],
[
"Ziegler",
"M.",
""
],
[
"Werner",
"K.",
""
],
[
"Kruk",
"J. W.",
""
],
[
"Oliveira",
"C. M.",
""
],
[
"Putte",
"D. Vande",
""
],
[
"Mignani",
"R. P.",
""
],
[
"Kerber",
"F.",
""
]
] |
0706.2257 | Pere Pascual | Pere Pascual Gainza, Llorenc Rubio i Pons | Algebraic K-theory and cubical descent | 18 pages | null | null | null | math.AG | null | In this note we apply Guillen-Navarro descent theorem, \cite{GN02}, to define
a descent variant of the algebraic $K$-theory of varieties over a field of
characteristic zero, $\mathcal{KD}(X)$, which coincides with $\mathcal{K}(X)$
for smooth varieties. After a result of Haesemeyer, this new theory is
equivalent to the homotopy algebraic $K$-theory introduced by Weibel. We also
prove that there is a natural weight filtration on the groups $KH_\ast(X)$.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:00:56 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Oct 2007 09:09:11 GMT"
}
] | 2007-10-04T00:00:00 | [
[
"Gainza",
"Pere Pascual",
""
],
[
"Pons",
"Llorenc Rubio i",
""
]
] |
0706.2258 | Raul Gago-Fernandez | R. Gago, G. Abrasonis, I. Jimenez, and W. Moeller | Growth mechanisms and structure of fullerene-like carbon-based thin
films: superelastic materials for tribological applications | Review article in "Fullerene Research Trends" to be published by Nova
Science Publishers Inc., New York. 46 pages | null | null | null | cond-mat.mtrl-sci | null | In this chapter we review our findings on the bonding structure and growth
mechanisms of carbon-based thin solid films with fullerene-like (FL)
microstructure. The so-called FL arrangements arise from the curvature and
cross-linking of basal planes in graphitic-like structures, partially
resembling that of molecular fullerenes. This three-dimensional superstructure
takes advantage of the strength of planar pi bonds in sp2 hybrids and confers
the material interesting mechanical properties, such as high hardness, high
elastic recovery, low-friction and wear-resistance. These properties can be
tailored by controlling the curvature, size and connectivity of the FL
arrangements, making these materials promising coatings for tribological
applications. We have focused our interest mostly on carbon nitride (CNx) since
nitrogen promotes the formation of FL arrangements at low substrate
temperatures and they are emerging over pure carbon coatings in tribological
applications such as protective overcoats in magnetic hard disks. We address
structural issues such as origin of plane curvature, nature of the
cross-linking sites and sp2 clustering, together with growth mechanisms based
on the role of film-forming precursors, chemical re-sputtering or concurrent
ion assistance during growth.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:06:05 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Gago",
"R.",
""
],
[
"Abrasonis",
"G.",
""
],
[
"Jimenez",
"I.",
""
],
[
"Moeller",
"W.",
""
]
] |
0706.2259 | Sebastian Hofferberth | S. Hofferberth, I. Lesanovsky, B. Fischer, T. Schumm, J. Schmiedmayer | Non-equilibrium coherence dynamics in one-dimensional Bose gases | to appear in nature | Nature 449, 324-327 (20 September 2007) | 10.1038/nature06149 | null | cond-mat.other cond-mat.supr-con | null | Low-dimensional systems are beautiful examples of many-body quantum physics.
For one-dimensional systems the Luttinger liquid approach provides insight into
universal properties. Much is known of the equilibrium state, both in the
weakly and strongly interacting regime. However, it remains a challenge to
probe the dynamics by which this equilibrium state is reached. Here we present
a direct experimental study of the coherence dynamics in both isolated and
coupled degenerate 1d Bose gases. Dynamic splitting is used to create two 1d
systems in a phase coherent state. The time evolution of the coherence is
revealed in local phase shifts of the subsequently observed interference
patterns. Completely isolated 1d Bose gases are observed to exhibit a universal
sub-exponential coherence decay in excellent agreement with recent predictions
by Burkov et al. [Phys. Rev. Lett. 98, 200404 (2007)]. For two coupled 1d Bose
gases the coherence factor is observed to approach a non-zero equilibrium value
as predicted by a Bogoliubov approach. This coupled-system decay to finite
coherence is the matter wave equivalent of phase locking two lasers by
injection. The non-equilibrium dynamics of superfluids plays an important role
in a wide range of physical systems, such as superconductors, quantum-Hall
systems, superfluid Helium, and spin systems. Our experiments studying
coherence dynamics show that 1d Bose gases are ideally suited for investigating
this class of phenomena.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:06:52 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 08:26:42 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Hofferberth",
"S.",
""
],
[
"Lesanovsky",
"I.",
""
],
[
"Fischer",
"B.",
""
],
[
"Schumm",
"T.",
""
],
[
"Schmiedmayer",
"J.",
""
]
] |
0706.2260 | Nicolas Didier | A. Zazunov, N. Didier, and F. W. J. Hekking | Quantum charge diffusion in underdamped Josephson junctions and
superconducting nanowires | 6 pages, 2 figures, replaced with published version | Europhys. Lett. 83, 47012 (2008) | 10.1209/0295-5075/83/47012 | null | cond-mat.mes-hall cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effect of quantum fluctuations on the current-voltage characteristics of
Josephson junctions and superconducting nanowires is studied in the underdamped
limit. Quantum fluctuations induce transitions between a Coulomb--blockade and
a supercurrent branch, and can significantly modify the shape of
current-voltage characteristics in the case of a highly resistive environment.
Owing to the phase-charge duality, our results can be directly extended to the
opposite overdamped limit.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:27:20 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Aug 2008 08:33:08 GMT"
}
] | 2008-08-21T00:00:00 | [
[
"Zazunov",
"A.",
""
],
[
"Didier",
"N.",
""
],
[
"Hekking",
"F. W. J.",
""
]
] |
0706.2261 | Hubert Flenner | Hubert Flenner, Shulim Kaliman, Mikhail Zaidenberg | Uniqueness of $\bf C^*$- and $\bf C_+$-actions on Gizatullin surfaces | 43 pages | null | null | null | math.AG | null | A Gizatullin surface is a normal affine surface $V$ over $\bf C$, which can
be completed by a zigzag; that is, by a linear chain of smooth rational curves.
In this paper we deal with the question of uniqueness of $\bf C^*$-actions and
$\bf A^1$-fibrations on such a surface $V$ up to automorphisms. The latter
fibrations are in one to one correspondence with $\bf C_+$-actions on $V$
considered up to a "speed change".
Non-Gizatullin surfaces are known to admit at most one $\bf A^1$-fibration
$V\to S$ up to an isomorphism of the base $S$. Moreover an effective $\bf
C^{*}$-action on them, if it does exist, is unique up to conjugation and
inversion $t\mapsto t^{-1}$ of $\bf C^*$. Obviously uniqueness of $\bf
C^*$-actions fails for affine toric surfaces; however we show in this case that
there are at most two conjugacy classes of $\bf A^1$-fibrations. There is a
further interesting family of non-toric Gizatullin surfaces, called the
Danilov-Gizatullin surfaces, where there are in general several conjugacy
classes of $\bf C^*$-actions and $\bf A^1$-fibrations.
In the present paper we obtain a criterion as to when $\bf A^1$-fibrations of
Gizatullin surfaces are conjugate up to an automorphism of $V$ and the base
$S$. We exhibit as well a large subclasses of Gizatullin $\bf C^{*}$-surfaces
for which a $\bf C^*$-action is essentially unique and for which there are at
most two conjugacy classes of $\bf A^1$-fibrations over $\bf A^1$.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:27:59 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Flenner",
"Hubert",
""
],
[
"Kaliman",
"Shulim",
""
],
[
"Zaidenberg",
"Mikhail",
""
]
] |
0706.2262 | Franciszek Szafraniec | M. M\"oller, F.H. Szafraniec | Adjoints and Formal Adjoints of Matrices of Unbounded Operators | null | null | null | null | math.FA math-ph math.MP | null | In this paper we {\em discuss} diverse aspects of mutual relationship between
adjoints and formal adjoints of unbounded operators bearing a matrix structure.
We emphasize on the behaviour of row and column operators as they turn out to
be the germs of an arbitrary matrix operator, providing most of the information
about the latter {as it is the troublemaker}.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:30:24 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Möller",
"M.",
""
],
[
"Szafraniec",
"F. H.",
""
]
] |
0706.2263 | Francesco Romeo | F. Romeo, R. Citro and M. Marinaro | Phase rigidity breaking in open Aharonov-Bohm ring coupled to a
cantilever | 7 pages, 8 figures | Phys. Rev. B 76, 081301(R) (2007) | 10.1103/PhysRevB.76.081301 | null | cond-mat.mes-hall | null | The conductance and the transmittance phase shifts of a two-terminal
Aharonov-Bohm (AB) ring are analyzed in the presence of mechanical
displacements due to coupling to an external can- tilever. We show that phase
rigidity is broken, even in the linear response regime, by means of inelastic
scattering due to phonons. Our device provides a way of observing continuous
variation of the transmission phase through a two-terminal
nano-electro-mechanical system (NEMS). We also propose measurements of phase
shifts as a way to determine the strength of the electron-phonon coupling in
NEMS.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:35:54 GMT"
}
] | 2007-09-24T00:00:00 | [
[
"Romeo",
"F.",
""
],
[
"Citro",
"R.",
""
],
[
"Marinaro",
"M.",
""
]
] |
0706.2264 | Carlos A. Salgado | Carlos A. Salgado | Hard QCD probes to quark-gluon plasma | 8 pages, invited talk at the YKIS Seminar on New Frontiers in QCD | Prog.Theor.Phys.Suppl.168:355-363,2007 | 10.1143/PTPS.168.355 | ROMA-1-1454-2007 | hep-ph | null | Completely unexplored regimes of QCD, dominated by high-density/temperature
effects, are available in heavy ion experiments at collider energies. The
successful RHIC program shows how relevant the high transverse momentum part of
the spectrum is for the characterization of the properties of the created
medium. It points, as well, to interesting properties of the nuclear wave
function at small fraction of momentum x, probably dominated by saturated color
fields. In both domains, the imminent LHC program will provide a phase space
enlarged by orders of magnitude with respect to those studied at RHIC. I will
review the present status of hard probes in heavy ion collisions as well as the
expectations for the LHC.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:45:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Salgado",
"Carlos A.",
""
]
] |
0706.2265 | Pierre Muller | F.Leroy, P.Muller, J.J.Metois, O.Pierre-Louis | Vicinal silicon surfaces: from step density wave to faceting | 26 pages, 9 figures | Physical Review B 76 045402 (2007) | 10.1103/PhysRevB.76.045402 | null | cond-mat.mtrl-sci | null | This paper investigates faceting mechanisms induced by electromigration in
the regime where atomic steps are transparent. For this purpose we study
several vicinal orientations by means of in-situ (optical diffraction,
electronic microscopy) as well as ex-situ (AFM, microprofilometry)
visualization techniques. The data show that faceting proceeds in two stages.
The first stage is short and leads to the appearance of a step density wave,
with a wavelength roughly independent of the surface orientation. The second
stage is much slower, and leads to the formation of a hill-and-valley
structure, the period of which depends on the initial surface orientation. A
simple continuum model enables us to point out why the wavelength of the step
density wave does not depend on the microscale details of the surface. The
final wavelength is controlled by the competition between elastic step-step
interaction and facet edge energy cost. Finally, the surface stress angular
dependence is shown to emerge as a coarsed-grained picture from the step model.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:45:12 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Leroy",
"F.",
""
],
[
"Muller",
"P.",
""
],
[
"Metois",
"J. J.",
""
],
[
"Pierre-Louis",
"O.",
""
]
] |
0706.2266 | Emilio d'Emilio | Paolo Christillin, Emilio d'Emilio | The role of the slope of `realistic' potential barriers in preventing
relativistic tunnelling in the Klein zone | null | Phys. Rev. A 76, 042104 (2007) | 10.1103/PhysRevA.76.042104 | null | quant-ph | null | The transmission of fermions of mass m and energy E through an electrostatic
potential barrier of rectangular shape (i.e. supporting an infinite electric
field), of height U> E + m - due to the many-body nature of the Dirac equation
evidentiated by the Klein paradox - has been widely studied. We exploit here
the analytical solution, given by Sauter for the linearly rising potential
step, to show that the tunnelling rate through a more realistic trapezoidal
barrier is exponentially depressed, as soon as the length of the regions
supporting a finite electric field exceeds the Compton wavelenght of the
particle - the latter circumstance being hardly escapable in most realistic
cases.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:46:48 GMT"
}
] | 2012-02-14T00:00:00 | [
[
"Christillin",
"Paolo",
""
],
[
"d'Emilio",
"Emilio",
""
]
] |
0706.2267 | Giorgio Chiarelli | Giorgo Chiarelli | A Review of Recent Results from the Tevatron | for the CDF and D0 Collaboration, DIS 07 Proceedings | null | null | null | hep-ex | null | The D0 and CDF experiments have been taking data at the Run 2 of the Tevatron
Collider since 2001. We present a selection of recent results, most of them
obtained with an integrated luminosity of $\simeq$ 1 fb$^{-1}$. I will describe
the most important facets of the physics programme and detail some results.
Recent direct limits on standard model Higgs obtained at the Tevatron, and
their their prospects will be also reviewed.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:48:50 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Chiarelli",
"Giorgo",
""
]
] |
0706.2268 | Dusanka Perisic | Z. Lozanov--Crvenkovic, D. Perisic, M. Taskovic | Gelfand-Shilov spaces, Structural and Kernel theorems | The name of the third autor is now properly written | null | null | null | quant-ph math.FA | null | It was shown recently that the space isomorphic with an Gelfand Shilov space
is well adapted for the use in quantum field theory with a fundamental length.
It is our believe that all Gelfand Shilov spaces, especially those with
quasianalytic test function spaces, are good domains for the quantum field
theory. The theory requires technical results from the theory of generalized
functions and not merely differential calculus and well defined Fourier
transform, but also the kernel theorem and the structural theorem. In the paper
we give the structural (regularity) theorem and kernel theorem for
Gelfand-Shilov spaces, of Roumieu and Beurling type.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:54:57 GMT"
},
{
"version": "v2",
"created": "Sat, 16 Jun 2007 06:12:00 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Lozanov--Crvenkovic",
"Z.",
""
],
[
"Perisic",
"D.",
""
],
[
"Taskovic",
"M.",
""
]
] |
0706.2269 | Falk Bruckmann | Falk Bruckmann (Regensburg U.) | Topological objects in QCD | 28 pages, 17 figures; Lectures given at 45th Internationale
Universitaetswochen fuer Theoretische Physik (International University School
of Theoretical Physics): Conceptual and Numerical Challenges in Femto- and
Peta-Scale Physics, Schladming, Styria, Austria, 24 Feb - 3 Mar 2007 | Eur.Phys.J.ST 152:61-88,2007 | 10.1140/epjst/e2007-00377-2 | null | hep-th hep-lat hep-ph | null | Topological excitations are prominent candidates for explaining
nonperturbative effects in QCD like confinement. In these lectures, I cover
both formal treatments and applications of topological objects. The typical
phenomena like BPS bounds, topology, the semiclassical approximation and chiral
fermions are introduced by virtue of kinks. Then I proceed in higher dimensions
with magnetic monopoles and instantons and special emphasis on calorons.
Analytical aspects are discussed and an overview over models based on these
objects as well as lattice results is given.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 11:28:17 GMT"
}
] | 2009-11-18T00:00:00 | [
[
"Bruckmann",
"Falk",
"",
"Regensburg U."
]
] |
0706.2270 | Alexei Larionov | A.B. Larionov, U. Mosel, and M. Wagner | Kaon production from 1 to 40 A GeV | 6 pages, 4 figures, Proc. of the Int. Workshop on Hot and Dense
Matter in Relativistic Heavy Ion Collisions, 09-12.04.2006, Budapest | Acta Phys.Hung.A27:427-432,2006 | 10.1556/APH.27.2006.4.6 | null | nucl-th | null | Kaon production is studied within the Giessen Boltzmann-Uehling-Uhlenbeck
(GiBUU) model. Results are compared with experiment and with other models. The
influence of the kaon potential on the kaon azimuthal distributions at SIS
energies is considered. We also discuss the role of the many-body collisions at
high-density phase of reaction.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 10:59:59 GMT"
}
] | 2011-01-25T00:00:00 | [
[
"Larionov",
"A. B.",
""
],
[
"Mosel",
"U.",
""
],
[
"Wagner",
"M.",
""
]
] |
0706.2271 | Charles M. Marcus | Yongjie Hu, Hugh H. O. Churchill, David J. Reilly, Jie Xiang, Charles
M. Lieber, Charles M. Marcus | Double quantum dot with integrated charge sensor based on Ge/Si
heterostructure nanowires | Related work at http://marcuslab.harvard.edu and
http://cmliris.harvard.edu | Nature Nanotechnology 2, 622 (2007). | 10.1038/nnano.2007.302 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Coupled electron spins in semiconductor double quantum dots hold promise as
the basis for solid-state qubits. To date, most experiments have used III-V
materials, in which coherence is limited by hyperfine interactions. Ge/Si
heterostructure nanowires seem ideally suited to overcome this limitation: the
predominance of spin-zero nuclei suppresses the hyperfine interaction and
chemical synthesis creates a clean and defect-free system with highly
controllable properties. Here we present a top gate-defined double quantum dot
based on Ge/Si heterostructure nanowires with fully tunable coupling between
the dots and to the leads. We also demonstrate a novel approach to charge
sensing in a one-dimensional nanostructure by capacitively coupling the double
dot to a single dot on an adjacent nanowire. The double quantum dot and
integrated charge sensor serve as an essential building block required to form
a solid-state spin qubit free of nuclear spin.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 11:06:03 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Hu",
"Yongjie",
""
],
[
"Churchill",
"Hugh H. O.",
""
],
[
"Reilly",
"David J.",
""
],
[
"Xiang",
"Jie",
""
],
[
"Lieber",
"Charles M.",
""
],
[
"Marcus",
"Charles M.",
""
]
] |
0706.2272 | Alison Setyadi | A. Setyadi | Expanders and the Affine Building of ${\rm Sp}_n$ | minor corrections made; 11 pages, 2 figures; to appear in Ars
Combinatoria | null | null | null | math.CO | null | For $n \geq 2$ and a local field $K$, let $\Delta_n$ denote the affine
building naturally associated to the symplectic group ${\rm Sp}_n(K)$. We
compute the spectral radius of the subgraph $Y_n$ of $\Delta_n$ induced by the
special vertices in $\Delta_n$, from which it follows that $Y_n$ is an analogue
of a family of expanders and is non-amenable.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 11:19:34 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 12:46:28 GMT"
}
] | 2008-03-04T00:00:00 | [
[
"Setyadi",
"A.",
""
]
] |
0706.2273 | Stanislaw Mrowczynski | Weronika Jas and Stanislaw Mrowczynski | Evolution of Anisotropy of Parton System from Relativistic Heavy-Ion
Collisions | minor corrections, 7 pages, 8 figures, to appear in Phys. Rev. C | Phys.Rev.C76:044905,2007 | 10.1103/PhysRevC.76.044905 | null | nucl-th hep-ph | null | Evolution of anisotropy in momentum and coordinate space of the parton system
produced in relativistic heavy-ion collisions is discussed within the
free-streaming approximation. The momentum distribution evolves from the
prolate shape - elongated along the beam - to the oblate one - squeezed along
the beam. At the same time the eccentricity in the coordinate space, which
occurs at finite values of impact parameter, decreases. It is argued that the
parton system reaches local thermodynamic equilibrium before the momentum
distribution becomes oblate.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 11:20:25 GMT"
},
{
"version": "v2",
"created": "Mon, 2 Jul 2007 18:28:26 GMT"
},
{
"version": "v3",
"created": "Sat, 15 Sep 2007 19:12:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Jas",
"Weronika",
""
],
[
"Mrowczynski",
"Stanislaw",
""
]
] |
0706.2274 | Jochen Rau | Jochen Rau | Consistent reasoning about a continuum of hypotheses on the basis of
finite evidence | 9 pages REVTeX, twocolumn, no figures; critical feedback very welcome | null | null | null | quant-ph math.ST stat.TH | null | In the modern Bayesian view classical probability theory is simply an
extension of conventional logic, i.e., a quantitative tool that allows for
consistent reasoning in the presence of uncertainty. Classical theory
presupposes, however, that--at least in principle--the amount of evidence that
an experimenter can accumulate always matches the size of the hypothesis space.
I investigate how the framework for consistent reasoning must be modified in
non-classical situations where hypotheses form a continuum, yet the maximum
evidence accessible through experiment is not allowed to exceed some finite
upper bound. Invoking basic consistency requirements pertaining to the
preparation and composition of systems, as well as to the continuity of
probabilities, I show that the modified theory must have an internal symmetry
isomorphic to the unitary group. It thus appears that the only consistent
algorithm for plausible reasoning about a continuum of hypotheses on the basis
of finite evidence is furnished by quantum theory in complex Hilbert space.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 11:46:37 GMT"
}
] | 2007-06-20T00:00:00 | [
[
"Rau",
"Jochen",
""
]
] |
0706.2275 | Peter Kamphuis | P. Kamphuis, B. W. Holwerda, R. J. Allen, R. F. Peletier, P. C. van
der Kruit | A dust component 2 kpc above the plane in NGC 891 | A&A in press. 5 pages, 3 figures | null | 10.1051/0004-6361:20077951 | null | astro-ph | null | The halo of NGC 891 has been the subject of studies for more than a decade.
One of its most striking features is the large asymmetry in H$\alpha$ emission.
In this letter, we will take a quantitative look at this asymmetry at different
wavelengths for the first time. We suggest that NGC 891 is intrinsically almost
symmetric and the large asymmetry in H$\alpha$ emission is mostly due to dust
attenuation. We will quantify the additional optical depth needed to cause the
observed asymmetry in this model. By comparing large strips on the North East
side of the galaxy with strips covering the same area in the South West we can
quantify and analyze the asymmetry in the different wavelengths. From the 24
$\mu$m emission we find that the intrinsic asymmetry in star formation in NGC
891 is small i.e., $\sim 30%$. The additional asymmetry in H$\alpha$ is modeled
as additional symmetric dust attenuation which extends up to $\sim$ 40\arcsec
(1.9 kpc) above the plane of the galaxy with a mid-plane value of $\tau$=0.8
and a scale height of 0.5 kpc
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 11:47:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kamphuis",
"P.",
""
],
[
"Holwerda",
"B. W.",
""
],
[
"Allen",
"R. J.",
""
],
[
"Peletier",
"R. F.",
""
],
[
"van der Kruit",
"P. C.",
""
]
] |
0706.2276 | Sebastian Sapeta | S. Sapeta | Heavy Flavor Production in DGLAP improved Saturation Model | 4 pages, 3 figures; Talk presented at the International Workshop on
Deep-Inelastic Scattering and Related Subjects, Munich, Germany, April 16-20,
2007 | null | null | CERN-PH-TH/2007-101 | hep-ph | null | The saturation model with DGLAP evolution is shown to give good description
of the production of the charm and beauty quarks in deep inelastic scattering.
The modifications of saturation properties caused by the presence of heavy
quarks are also discussed.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 11:51:29 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Sapeta",
"S.",
""
]
] |
0706.2277 | Michael Gilowski | M. Gilowski, Ch. Schubert, M. Zaiser, W. Herr, T. W\"ubbena, T.
Wendrich, T. M\"uller, E.M. Rasel, and W. Ertmer (Institut f\"ur
Quantenoptik, Leibniz Universit\"at Hannover) | Narrow bandwidth interference filter-stabilized diode laser systems for
the manipulation of neutral atoms | 9 pages, 3 figures, 1 table | null | 10.1016/j.optcom.2007.08.043 | null | physics.atom-ph physics.optics | null | We present and investigate different external cavity diode laser (ECDL)
configurations for the manipulation of neutrals atoms, wavelength-stabilized by
a narrow-band high transmission interference filter. A novel diode laser,
providing high output power of more than 1 W, with a linewidth of less than 200
kHz, based on a self-seeded tapered amplifier chip has been developed.
Additionally, we compare the optical and spectral properties of two laser
systems based on common laser diodes, differing in their coating, as well as
one, based on a distributed-feedback (DFB) diode. The linear cavity setup in
all these systems combines a robust and compact design with a high wavelength
tunability and an improved stability of the optical feedback compared to diode
laser setups using diffraction gratings for wavelength discrimination.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 12:13:21 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Sep 2007 16:56:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gilowski",
"M.",
"",
"Institut für\n Quantenoptik, Leibniz Universität Hannover"
],
[
"Schubert",
"Ch.",
"",
"Institut für\n Quantenoptik, Leibniz Universität Hannover"
],
[
"Zaiser",
"M.",
"",
"Institut für\n Quantenoptik, Leibniz Universität Hannover"
],
[
"Herr",
"W.",
"",
"Institut für\n Quantenoptik, Leibniz Universität Hannover"
],
[
"Wübbena",
"T.",
"",
"Institut für\n Quantenoptik, Leibniz Universität Hannover"
],
[
"Wendrich",
"T.",
"",
"Institut für\n Quantenoptik, Leibniz Universität Hannover"
],
[
"Müller",
"T.",
"",
"Institut für\n Quantenoptik, Leibniz Universität Hannover"
],
[
"Rasel",
"E. M.",
"",
"Institut für\n Quantenoptik, Leibniz Universität Hannover"
],
[
"Ertmer",
"W.",
"",
"Institut für\n Quantenoptik, Leibniz Universität Hannover"
]
] |
0706.2278 | Slavek Rucinski | Krzysztof Z. Kaminski, Slavek M. Rucinski, Jaymie M. Matthews, Rainer
Kuschnig, Jason F. Rowe, David B. Guenther, Anthony F. J. Moffat, Dimitar
Sasselov, Gordon A. H. Walker, Werner W. Weiss | MOST photometry and DDO spectroscopy of the eclipsing (white dwarf + red
dwarf) binary V471 Tau | accepted for publication in AJ | Astron.J.134:1206-1215,2007 | 10.1086/520923 | null | astro-ph | null | The Hyades K2V+WD system 471 Tau is a prototype post-common envelope system
and a likely cataclysmic binary progenitor. We present 10 days of nearly
continuous optical photometry by the MOST (Microvariability & Oscillations of
STars) satellite and partly simultaneous optical spectroscopy from DDO (David
Dunlap Observatory) of the binary. The photometric data indicate that the spot
coverage of the K dwarf component was less than observed in the past,
suggesting that we monitored the star close to a minimum in its activity cycle.
Despite the low spot activity, we still detected seven flare-like events whose
estimated energies are among the highest ever observed in V471 Tau and whose
times of occurrence do not correlate with the binary orbital phase. A detailed
O-C analysis of the times of eclipse over the last ~35 years reveals timing
variations which could be explained in several ways, including perturbations by
an as-yet-undetected third body in the system or by a small orbital
eccentricity inducing slow apsidal motion. The DDO spectra result in improved
determinations of the K dwarf projected rotation velocity, V_K sin i = 92 km
s^-1, and the orbital amplitude, K_K=150.5 km s^-1. The spectra also allow us
to measure changes in H_alpha emission strength and radial velocity (RV)
variations. We measure a larger H_alpha velocity amplitude than found
previously suggesting that the source of the emission in V471 Tau was less
concentrated around the sub-white-dwarf point on the K star than had been
observed in previous studies.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 12:12:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kaminski",
"Krzysztof Z.",
""
],
[
"Rucinski",
"Slavek M.",
""
],
[
"Matthews",
"Jaymie M.",
""
],
[
"Kuschnig",
"Rainer",
""
],
[
"Rowe",
"Jason F.",
""
],
[
"Guenther",
"David B.",
""
],
[
"Moffat",
"Anthony F. J.",
""
],
[
"Sasselov",
"Dimitar",
""
],
[
"Walker",
"Gordon A. H.",
""
],
[
"Weiss",
"Werner W.",
""
]
] |
0706.2279 | Svetlana Boriskina | Svetlana V. Pishko, Phillip Sewell, Trevor M. Benson, and Svetlana V.
Boriskina | Efficient analysis and design of low-loss whispering-gallery-mode
coupled resonator optical waveguide bends | 8 pages with 10 figures (to appear in IEEE/OSA J. Lightwave
Technology, 2007) | J. Lightw. Technol. 25(9) 2487-2494 (2007) | 10.1109/JLT.2007.903295 | null | physics.optics | null | Waveguides composed of electromagnetically-coupled optical microcavities
(coupled resonator optical waveguides or CROWs) can be used for light guiding,
slowing and storage. In this paper, we present a two-dimensional analysis of
finite-size straight and curved CROW sections based on a rigorous Muller
boundary integral equations method. We study mechanisms of the coupling of
whispering gallery (WG) modes and guiding light around bends in CROWs composed
of both identical and size-mismatched microdisk resonators. Our accurate
analysis reveals differences in WG modes coupling in the vicinity of bends in
CROWs composed of optically-large and wavelength-scale microcavities. We
propose and discuss possible ways to design low-loss CROW bends and to reduce
bend losses. These include selecting specific bend angles depending on the
azimuthal order of the WG mode and tuning the radius of the microdisk
positioned at the CROW bend.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 12:19:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pishko",
"Svetlana V.",
""
],
[
"Sewell",
"Phillip",
""
],
[
"Benson",
"Trevor M.",
""
],
[
"Boriskina",
"Svetlana V.",
""
]
] |
0706.2280 | Gianluca Geloni | Gianluca Geloni, Evgeni Saldin, Evgeni Schneidmiller and Mikhail
Yurkov | Longitudinal impedance and wake from XFEL undulators. Impact on
current-enhanced SASE schemes | 44 pages, 2 figures | Nucl.Instrum.Meth.A583:228-247,2007 | 10.1016/j.nima.2007.09.019 | DESY 07-087 | physics.acc-ph physics.optics | null | In this article we derive longitudinal impedance and wake function for an
undulator setup with arbitrary undulator parameter, taking into account a
finite transverse size of the electron bunch. Earlier studies considered a line
density-distribution of electrons instead. We focus our attention on the
long-wavelength asymptote (compared with resonance wavelength), at large
distance of the electron bunch from the undulator entrance compared to the
overtaking length, and for large vacuum-chamber size compared to the typical
transverse size of the field. These restrictions define a parameter region of
interest for practical applications. We calculate a closed expression for
impedance and wake function that may be evaluated numerically in the most
general case. Such expression allows us to derive an analytical solution for a
Gaussian transverse and longitudinal bunch shape. Finally, we study the
feasibility of current-enhanced SASE schemes (ESASE) recently proposed for
LCLS, that fall well-within our approximations. Numerical estimations presented
in this paper indicate that impedance-induced energy spread is sufficient to
seriously degrade the FEL performance. Our conclusion is in contrast with
results in literature, where wake calculations for the LCLS case are given in
free-space, as if the presence of the undulator were negligible.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 12:27:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Geloni",
"Gianluca",
""
],
[
"Saldin",
"Evgeni",
""
],
[
"Schneidmiller",
"Evgeni",
""
],
[
"Yurkov",
"Mikhail",
""
]
] |
0706.2281 | Alexander Yu. Vlasov | Alexander Yu. Vlasov (FRC/IRH) | Some questions of Monte-Carlo modeling on nontrivial bundles | LaTeX, 8pp, 1 fig, v2: mistype in eq(4) corrected | null | null | null | math-ph math.MP stat.CO | null | In this work are considered some questions of Monte-Carlo modeling on
nontrivial bundles. As a basic example is used problem of generation of
straight lines in 3D space, related with modeling of interaction of a solid
body with a flux of particles and with some other tasks. Space of lines used in
given model is example of nontrivial fiber bundle, that is equivalent with
tangent sheaf of a sphere.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 12:30:19 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Jun 2007 11:45:55 GMT"
}
] | 2010-05-11T00:00:00 | [
[
"Vlasov",
"Alexander Yu.",
"",
"FRC/IRH"
]
] |
0706.2282 | Alexander E. Holroyd | Alexander E. Holroyd | Partition Identities and the Coin Exchange Problem | 6 pages | null | null | null | math.CO math.NT | null | The number of partitions of n into parts divisible by a or b equals the
number of partitions of n in which each part and each difference of two parts
is expressible as a non-negative integer combination of a or b. This
generalizes identities of MacMahon and Andrews. The analogous identities for
three or more integers (in place of a,b) hold in certain cases.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 18:28:41 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Holroyd",
"Alexander E.",
""
]
] |
0706.2283 | Motoyasu Ikeda | Super-Kamiokande Collaboration: M.Ikeda, A.Takeda, Y.Fukuda,
M.R.Vagins, et al | Search for Supernova Neutrino Bursts at Super-Kamiokande | 7 pages, 6 figures | Astrophys.J.669:519-524,2007 | 10.1086/521547 | null | astro-ph hep-ex | null | The result of a search for neutrino bursts from supernova explosions using
the Super-Kamiokande detector is reported. Super-Kamiokande is sensitive to
core-collapse supernova explosions via observation of their neutrino emissions.
The expected number of events comprising such a burst is ~10^4 and the average
energy of the neutrinos is in few tens of MeV range in the case of a
core-collapse supernova explosion at the typical distance in our galaxy (10
kiloparsecs); this large signal means that the detection efficiency anywhere
within our galaxy and well past the Magellanic Clouds is 100%. We examined a
data set which was taken from May, 1996 to July, 2001 and from December, 2002
to October, 2005 corresponding to 2589.2 live days. However, there is no
evidence of such a supernova explosion during the data-taking period. The 90%
C.L. upper limit on the rate of core-collapse supernova explosions out to
distances of 100 kiloparsecs is found to be 0.32 SN/year.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 12:42:07 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"Kamiokande Collaboration",
"",
""
],
[
"Ikeda",
"M.",
""
],
[
"Takeda",
"A.",
""
],
[
"Fukuda",
"Y.",
""
],
[
"Vagins",
"M. R.",
""
]
] |
0706.2284 | Jan Weiland | J. Weiland, A. Zagorodny and V. Zasenko | On advanced fluid modelling of drift wave turbulence | Nine pages, 2 figures | null | null | null | physics.plasm-ph | null | The Dupree-Weinstock renormalization is used to prove that a reactive closure
exists for drift wave turbulence in magnetized plasmas. The result is used to
explain recent results in gyrokinetic simulations and is also related to the
Mattor-Parker closure. The level of closure is found in terms of applied
external sources.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 12:44:05 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Weiland",
"J.",
""
],
[
"Zagorodny",
"A.",
""
],
[
"Zasenko",
"V.",
""
]
] |
0706.2285 | Michele Caselle | L. Martignetti and M. Caselle | Universal power law behaviors in genomic sequences and evolutionary
models | 15 pages, 3 figures | null | 10.1103/PhysRevE.76.021902 | null | q-bio.GN cond-mat.other physics.bio-ph q-bio.QM | null | We study the length distribution of a particular class of DNA sequences known
as 5'UTR exons. These exons belong to the messanger RNA of protein coding
genes, but they are not coding (they are located upstream of the coding portion
of the mRNA) and are thus less constrained from an evolutionary point of view.
We show that both in mouse and in human these exons show a very clean power law
decay in their length distribution and suggest a simple evolutionary model
which may explain this finding. We conjecture that this power law behaviour
could indeed be a general feature of higher eukaryotes.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 12:46:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Martignetti",
"L.",
""
],
[
"Caselle",
"M.",
""
]
] |
0706.2286 | Philippe Grandclement | Philippe Grandclement (LUTH), J\'er\^ome Novak (LUTH) | Spectral Methods for Numerical Relativity | This new version has been accepted for publication in Living Reviews
in Relativity | Living Reviews in Relativity (2009) lrr-1009-1 | 10.12942/lrr-2009-1 | null | gr-qc math.SP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Equations arising in General Relativity are usually too complicated to be
solved analytically and one has to rely on numerical methods to solve sets of
coupled partial differential equations. Among the possible choices, this paper
focuses on a class called spectral methods where, typically, the various
functions are expanded onto sets of orthogonal polynomials or functions. A
theoretical introduction on spectral expansion is first given and a particular
emphasis is put on the fast convergence of the spectral approximation. We
present then different approaches to solve partial differential equations,
first limiting ourselves to the one-dimensional case, with one or several
domains. Generalization to more dimensions is then discussed. In particular,
the case of time evolutions is carefully studied and the stability of such
evolutions investigated. One then turns to results obtained by various groups
in the field of General Relativity by means of spectral methods. First, works
which do not involve explicit time-evolutions are discussed, going from rapidly
rotating strange stars to the computation of binary black holes initial data.
Finally, the evolutions of various systems of astrophysical interest are
presented, from supernovae core collapse to binary black hole mergers.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 12:41:39 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Oct 2008 12:05:35 GMT"
}
] | 2016-06-22T00:00:00 | [
[
"Grandclement",
"Philippe",
"",
"LUTH"
],
[
"Novak",
"Jérôme",
"",
"LUTH"
]
] |
0706.2287 | Pramod Joag | Ali Ahanj, Pramod S. Joag, Sibasish Ghosh | Simulation of two spin-$s$ singlet correlations for all $s$ involving
spin measurements | 13 pages Latex, one eps figure | null | null | null | quant-ph | null | In a recent paper [A. Ahanj et al., quant-ph/0603053], we gave a classical
protocol to simulate quantum correlations corresponding to the spin $s$ singlet
state for the infinite sequence of spins satisfying $2s+1 = 2^{n}$. In the
present paper, we have generalized this result by giving a classical protocol
to exactly simulate quantum correlations implied by the spin-$s$ singlet state
corresponding to all integer as well as half-integer spin values $s$. The class
of measurements we consider here are only those corresponding to spin
observables, as has been done in the above-mentioned paper. The required amount
of communication is found to be $\lceil {\rm log}_{2} (s + 1) \rceil$ in the
worst case scenario, where $\lceil x \rceil$ is the least integer greater than
or equal to $x$.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:08:34 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Ahanj",
"Ali",
""
],
[
"Joag",
"Pramod S.",
""
],
[
"Ghosh",
"Sibasish",
""
]
] |
0706.2288 | Antonio Sollima | A. Sollima, G. Beccari, F. R. Ferraro, F. Fusi Pecci, A. Sarajedini | The fraction of binary systems in the core of thirteen low-density
Galactic globular clusters | 12 pages, 10 figures, accepted for publication by MNRAS | null | 10.1111/j.1365-2966.2007.12116.x | null | astro-ph | null | We used deep observations collected with ACS@HST to derive the fraction of
binary systems in a sample of thirteen low-density Galactic globular clusters.
By analysing the color distribution of Main Sequence stars we derived the
minimum fraction of binary systems required to reproduce the observed
color-magnitude diagram morphologies. We found that all the analysed globular
clusters contain a minimum binary fraction larger than 6% within the core
radius. The estimated global fractions of binary systems range from 10% to 50%
depending on the cluster. A dependence of the relative fraction of binary
systems on the cluster age has been detected, suggesting that the binary
disruption process within the cluster core is active and can significantly
reduce the binary content in time.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:08:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sollima",
"A.",
""
],
[
"Beccari",
"G.",
""
],
[
"Ferraro",
"F. R.",
""
],
[
"Pecci",
"F. Fusi",
""
],
[
"Sarajedini",
"A.",
""
]
] |
0706.2289 | Natalia Matveeva | N.A.Matveeva, A.V.Taichenachev, A.M.Tumaikin, V.I.Yudin | Laser cooling of unbound atoms in nondissipative optical lattices | 18 pages, 7 figures | JETP, 2007, 105, 2, pp. 306-313 | 10.1134/S1063776107080031 | null | physics.optics | null | The semiclassical theory of laser cooling is applied for the analysis of
cooling of unbound atoms with the values of the ground and exited state angular
moments 1/2 in a one-dimensional nondissipative optical lattice. We show that
in the low-saturation limit with respect to the pumping field a qualitative
interpretation of the cooling mechanisms can be made by the consideration of
effective two-level system of the ground-state sublevels. It is clarified that
in the limit of weak Raman transitions the cooling mechanism is similar to the
Doppler mechanism, which is known in the theory of two-level atom. In the limit
of strong Raman transitions the cooling mechanism is similar to the known
Sisyphus mechanism. In the slow atom approximation the analytical expressions
for the coefficients of friction, spontaneous and induced diffusion are given,
and the kinetic temperature is estimated.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:13:21 GMT"
}
] | 2011-10-05T00:00:00 | [
[
"Matveeva",
"N. A.",
""
],
[
"Taichenachev",
"A. V.",
""
],
[
"Tumaikin",
"A. M.",
""
],
[
"Yudin",
"V. I.",
""
]
] |
0706.2290 | Stephan Falke | Stephan Falke, Eberhard Tiemann, Christian Lisdat | Study of the Born-Oppenheimer Approximation for Mass-Scaling of Cold
Collision Properties | 8 pages, 6 figures | Phys. Rev. A 76, 012724 (2007) | 10.1103/PhysRevA.76.012724 | null | cond-mat.other | null | Asymptotic levels of the A $^1\Sigma_u^+$ state of the two isotopomers
$^{39}{\rm K}_2$ and $^{39}{\rm K}^{41}{\rm K}$ up to the dissociation limit
are investigated with a Doppler-free high resolution laser-spectroscopic
experiment in a molecular beam. The observed level structure can be reproduced
correctly only if a mass dependent correction term is introduced for the
interaction potential. The applied relative correction in the depth of the
potential is $10^{-6}$, which is in the order of magnitude expected for
corrections of the Born-Oppenheimer approximation. A similar change in ground
state potentials might lead to significant changes of mass-scaled properties
describing cold collisions like the s-wave scattering length.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:15:12 GMT"
}
] | 2007-08-21T00:00:00 | [
[
"Falke",
"Stephan",
""
],
[
"Tiemann",
"Eberhard",
""
],
[
"Lisdat",
"Christian",
""
]
] |
0706.2291 | Changxing Miao | Jia Yuan | Existence theorem and blow-up criterion of the strong solutions to the
Magneto-micropolar fluid equations | 19pages | Mathematical Methods in the Applied Sciences, Vol.31,
9(2008)1113-1130 | 10.1002/mma.967 | null | math.AP | null | In this paper we study the magneto-micropolar fluid equations in $\R^3$,
prove the existence of the strong solution with initial data in $H^s(\R^3)$ for
$s> {3/2}$, and set up its blow-up criterion. The tool we mainly use is
Littlewood-Paley decomposition, by which we obtain a Beale-Kato-Majda type
blow-up criterion for smooth solution $(u,\omega,b)$ which relies on the
vorticity of velocity $\nabla\times u$ only.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:18:06 GMT"
}
] | 2008-10-26T00:00:00 | [
[
"Yuan",
"Jia",
""
]
] |
0706.2292 | Roderik Bruce | R. Bruce (1), A. Drees (2), W. Fischer (2), S. Gilardoni (1), J.M.
Jowett (1), S.R. Klein (3), S. Tepikian (2) ((1) CERN, Geneva, Switzerland,
(2) BNL, Upton, USA, (3) LBNL, Berkeley, USA) | First observations of beam losses due to bound-free pair production in a
heavy-ion collider | 4 pages, 5 figures. Added journal ref. Corrected typos. Fixed fig 1.
Minor improvements to fig. 1,3,4. Rephrased a small number of sentences
(p1,3,4). Added numerical values of the aperture and the displacement for Au
(p 2). Changed reference 5, added name in acknowledgments (p 4) | Phys.Rev.Lett.99:144801,2007 | 10.1103/PhysRevLett.99.144801 | null | physics.acc-ph nucl-ex | null | We report the first observations of beam losses due to bound-free pair
production at the interaction point of a heavy-ion collider. This process is
expected to be a major luminosity limit for the Large Hadron Collider (LHC)
when it operates with 208Pb82+ ions because the localized energy deposition by
the lost ions may quench superconducting magnet coils. Measurements were
performed at the Relativistic Heavy Ion Collider (RHIC) during operation with
100 GeV/nucleon 63Cu29+ ions. At RHIC, the rate, energy and magnetic field are
low enough so that magnet quenching is not an issue. The hadronic showers
produced when the single-electron ions struck the RHIC beampipe were observed
using an array of photodiodes. The measurement confirms the order of magnitude
of the theoretical cross section previously calculated by others.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 15:53:59 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Sep 2007 15:58:49 GMT"
},
{
"version": "v3",
"created": "Wed, 12 Sep 2007 17:19:21 GMT"
},
{
"version": "v4",
"created": "Fri, 5 Oct 2007 08:53:02 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bruce",
"R.",
""
],
[
"Drees",
"A.",
""
],
[
"Fischer",
"W.",
""
],
[
"Gilardoni",
"S.",
""
],
[
"Jowett",
"J. M.",
""
],
[
"Klein",
"S. R.",
""
],
[
"Tepikian",
"S.",
""
]
] |
0706.2293 | Romain Pechoux | Jean-Yves Marion and Romain Pechoux | Resource control of object-oriented programs | null | null | null | null | cs.PL cs.LO | null | A sup-interpretation is a tool which provides an upper bound on the size of a
value computed by some symbol of a program. Sup-interpretations have shown
their interest to deal with the complexity of first order functional programs.
For instance, they allow to characterize all the functions bitwise computable
in Alogtime. This paper is an attempt to adapt the framework of
sup-interpretations to a fragment of oriented-object programs, including
distinct encodings of numbers through the use of constructor symbols, loop and
while constructs and non recursive methods with side effects. We give a
criterion, called brotherly criterion, which ensures that each brotherly
program computes objects whose size is polynomially bounded by the inputs
sizes.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:39:12 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Marion",
"Jean-Yves",
""
],
[
"Pechoux",
"Romain",
""
]
] |
0706.2294 | Niko Jokela | Kari Enqvist, Niko Jokela, Esko Keski-Vakkuri, Lotta Mether | On the origin of thermal string gas | 16 pages, 4 figures, v2: references added | JCAP 0710:001,2007 | 10.1088/1475-7516/2007/10/001 | HIP-2007-34/TH | hep-th astro-ph gr-qc | null | We investigate decaying D-branes as the origin of the thermal string gas of
string gas cosmology. We consider initial configurations of low-dimensional
branes and argue that they can time evolve to thermal string gas. We find that
there is a range in the weak string coupling and fast brane decay time regimes,
where the initial configuration could drive the evolution of the dilaton to
values, where exactly three spacelike directions grow large.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:42:27 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Sep 2007 09:05:38 GMT"
}
] | 2009-11-18T00:00:00 | [
[
"Enqvist",
"Kari",
""
],
[
"Jokela",
"Niko",
""
],
[
"Keski-Vakkuri",
"Esko",
""
],
[
"Mether",
"Lotta",
""
]
] |
0706.2295 | Anastasia Jivulescu | M. A. Jivulescu, A. Messina, A. Napoli, F. Petruccione | Exact treatment of linear difference equations with noncommutative
coefficients | 7 pages, 0 figures | null | 10.1002/mma.933 | null | math-ph math.MP | null | The exact solution of a Cauchy problem related to a linear second-order
difference equation with constant noncommutative coefficients is reported.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:52:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jivulescu",
"M. A.",
""
],
[
"Messina",
"A.",
""
],
[
"Napoli",
"A.",
""
],
[
"Petruccione",
"F.",
""
]
] |
0706.2296 | Rafael Dias Vilela | Rafael Dias Vilela, Tam\'as T\'el, Alessandro P. S. de Moura, Celso
Grebogi | Signatures of fractal clustering of aerosols advected under gravity | Accepted for publication in Phys. Rev. E (Rapid Communications) | Phys. Rev. E 75, 065203(R) (2007) | null | null | nlin.CD physics.ao-ph physics.flu-dyn | null | Aerosols under chaotic advection often approach a strange attractor. They
move chaotically on this fractal set but, in the presence of gravity, they have
a net vertical motion downwards. In practical situations, observational data
may be available only at a given level, for example at the ground level. We
uncover two fractal signatures of chaotic advection of aerosols under the
action of gravity. Each one enables the computation of the fractal dimension
$D_{0}$ of the strange attractor governing the advection dynamics from data
obtained solely at a given level. We illustrate our theoretical findings with a
numerical experiment and discuss their possible relevance to meteorology.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:50:21 GMT"
}
] | 2007-06-28T00:00:00 | [
[
"Vilela",
"Rafael Dias",
""
],
[
"Tél",
"Tamás",
""
],
[
"de Moura",
"Alessandro P. S.",
""
],
[
"Grebogi",
"Celso",
""
]
] |
0706.2297 | Bau-Sen Du | Bau-Sen Du | The Minimal Number of Periodic Orbits of Periods Guaranteed in
Sharkovskii's Theorem | 11 pages | Bull. Austral. Math. Soc. 31(1985), 89-103. Corrigendum: 32
(1985), 159 | null | null | math.DS math.NT | null | Let f(x) be a continuous function from a compact real interval into itself
with a periodic orbit of minimal period m, where m is not an integral power of
2. Then, by Sharkovsky's theorem, for every positive integer n with m \prec n
in the Sharkovsky's ordering defined below, a lower bound on the number of
periodic orbits of f(x) with minimal period n is 1. Could we improve this lower
bound from 1 to some larger number? In this paper, we give a complete answer to
this question.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:52:02 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Du",
"Bau-Sen",
""
]
] |
0706.2298 | Martin L\"uscher | Martin L\"uscher | Local coherence and deflation of the low quark modes in lattice QCD | Plain TeX, 23 pages, 4 figures included; minor text modifications;
version published in JHEP | JHEP0707:081,2007 | 10.1088/1126-6708/2007/07/081 | CERN-PH-TH/2007-096 | hep-lat | null | The spontaneous breaking of chiral symmetry in QCD is known to be linked to a
non-zero density of eigenvalues of the massless Dirac operator near the origin.
Numerical studies of two-flavour QCD now suggest that the low quark modes are
locally coherent to a certain extent. As a consequence, the modes can be
simultaneously deflated, using local projectors, with a total computational
effort proportional to the lattice volume (rather than its square). Deflation
has potentially many uses in lattice QCD. The technique is here worked out for
the case of quark propagator calculations, where large speed-up factors and a
flat scaling behaviour with respect to the quark mass are achieved.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:52:46 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Jun 2007 08:26:37 GMT"
},
{
"version": "v3",
"created": "Wed, 27 Jun 2007 08:59:09 GMT"
},
{
"version": "v4",
"created": "Mon, 30 Jul 2007 15:03:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lüscher",
"Martin",
""
]
] |
0706.2299 | David Hogg | David E. Hogg, Morton S. Roberts, Martha P. Haynes, and Ronald J.
Maddalena | Diffuse HI Disks in Isolated Galaxies | 26 pages | Astron.J.134:1046-1060,2007 | 10.1086/520766 | null | astro-ph | null | In order to investigate the contribution of diffuse components to their total
HI emission, we have obtained high precision HI line flux densities with the
100m Green Bank Telescope for a sample of 100 isolated spiral and irregular
galaxies which we have previously observed with the 43m telescope. A comparison
of the observed HI line fluxes obtained with the two different telescopes,
characterized by half-power beam widths of 9 arcmin and 21 arcmin respectively,
exploits a ``beam matching'' technique to yield a statistical determination of
the occurrence of diffuse HI components in their disks. A simple model of the
HI distribution within a galaxy well describes ~75 % of the sample and accounts
for all of the HI line flux density. The remaining galaxies are approximately
evenly divided into two categories: ones which appear to possess a
significantly more extensive HI distribution than the model predicts, and ones
for which the HI distribution is more centrally concentrated than predicted.
Examples of both extremes can be found in the literature but little attention
has been paid to the centrally concentrated HI systems. Our sample has
demonstrated that galaxies do not commonly possess extended regions of low
surface brightness HI gas which is not accounted for by our current
understanding of the structure of HI disks. Eight HI-rich companions to the
target objects are identified, and a set of extragalactic HI line flux density
calibrators is presented.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 19:10:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hogg",
"David E.",
""
],
[
"Roberts",
"Morton S.",
""
],
[
"Haynes",
"Martha P.",
""
],
[
"Maddalena",
"Ronald J.",
""
]
] |
0706.2300 | Bernard Silvestre-Brac | Bernard Silvestre-Brac, Vincent Mathieu | The few-body problem in terms of correlated gaussians | 10 pages | Phys.Rev.E76:046702,2007 | 10.1103/PhysRevE.76.046702 | null | hep-ph physics.comp-ph | null | In their textbook, Suzuki and Varga [Y. Suzuki and K. Varga, {\em Stochastic
Variational Approach to Quantum-Mechanical Few-Body Problems} (Springer,
Berlin, 1998)] present the stochastic variational method in a very exhaustive
way. In this framework, the so-called correlated gaussian bases are often
employed. General formulae for the matrix elements of various operators can be
found in the textbook. However the Fourier transform of correlated gaussians
and their application to the management of a relativistic kinetic energy
operator are missing and cannot be found in the literature. In this paper we
present these interesting formulae. We give also a derivation for new
formulations concerning central potentials; the corresponding formulae are more
efficient numerically than those presented in the textbook.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 13:58:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Silvestre-Brac",
"Bernard",
""
],
[
"Mathieu",
"Vincent",
""
]
] |
0706.2301 | Beate Stelzer | B. Stelzer and G. Micela (INAF - OA Palermo) | X-ray detection of the substellar twin 2MASS J11011926-7732383 AB | accepted for publication in Astronomy & Astrophysics | null | 10.1051/0004-6361:20077564 | null | astro-ph | null | 2MASS J11011926-7732383 AB (hereafter 2M1101AB), located in the Cha I star
forming region, is a rare wide-separation brown dwarf binary. XMM-Newton and
Chandra observations of 2M1101AB have allowed us to examine the influence of
physical parameters (mass, bolometric luminosity and effective temperature) on
X-ray emission from a coeval pair of substellar objects. The spatial resolution
of XMM-Newton is not sufficient to separate contributions from the two
components in the binary. The X-ray source detected with XMM-Newton has a
column density compatible with the infrared extinction of component A. On the
other hand, the binary is resolved with Chandra, and the bulk of the X-ray
emission is clearly associated with the photospherically cooler component B.
These apparently contradictory results point at strong variability of 2M1101's
X-ray emission. Combined with previous sensitive X-ray observations from
low-mass members of ChaI, we find a decline of X-ray luminosity with decreasing
(sub)stellar mass that is typical for star forming regions. 2M1101B is the
coolest (spectral type M8.25) and least massive brown dwarf of ChaI detected in
X-rays so far. It is also among the youngest (~1 Myr) substellar ChaI members,
and therefore relatively luminous. Most bona fide brown dwarfs of Cha I have
remained below the sensitivity limits of available X-ray observations, because
of their low luminosity associated with higher age.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 14:06:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stelzer",
"B.",
"",
"INAF - OA Palermo"
],
[
"Micela",
"G.",
"",
"INAF - OA Palermo"
]
] |
0706.2302 | Pierre Muller | J.J.Metois, A.Saul, P. Muller | Measuring the surface stress polar dependence | 8 pages, 6 Figures | nature Materials Vol 4 (2005) 238 | 10.1038/nmat1328 | null | cond-mat.mtrl-sci | null | While measurements of the polar dependence of the surface free energy are
easily available, measurements of the whole polar dependence of the surface
stress of a crystal do not exist. In this paper is presented a new procedure
that allows, for the first time, the experimental determination of the surface
stress polar dependence of a crystal. For this purpose (1) electromigration is
used to control the kinetic faceting of surface orientations that belong to the
equilibrium shape of the crystal and (2) for each destabilised surface, the
period of faceting as well as the crystallographic angles of the appearing
facets are measured by AFM. The so-obtained data lead to a set of equations
whose mathematical solution, compatible with physical constraints, gives access
to the surface stress polar dependence of the whole crystal and thus to a
better understanding of surface stress properties.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 14:07:10 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Metois",
"J. J.",
""
],
[
"Saul",
"A.",
""
],
[
"Muller",
"P.",
""
]
] |
0706.2303 | Riccardo Messina | R. Messina, M.A. Jivulescu, A. Messina and A. Napoli | Riccati equation-based generalization of Dawson's integral function | 11 pages. Accepted on Mathematical Methods in the Applied Sciences | Math. Meth. Appl. Sci. 30, 2055 (2007) | 10.1002/mma.916 | null | math-ph math.MP | null | A new generalization of Dawson's integral function based on the link between
a Riccati nonlinear differential equation and a second-order ordinary
differential equation is reported. The MacLaurin expansion of this generalized
function is built up and to this end an explicit formula for a generic cofactor
of a triangular matrix is deduced.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 14:13:34 GMT"
}
] | 2012-06-05T00:00:00 | [
[
"Messina",
"R.",
""
],
[
"Jivulescu",
"M. A.",
""
],
[
"Messina",
"A.",
""
],
[
"Napoli",
"A.",
""
]
] |
0706.2304 | Gregory Gabadadze | Gregory Gabadadze and Rachel A. Rosen | Charged Condensation | 1+11 pages; v2: comments and reference added, PLB version | Phys.Lett.B658:266-272,2008 | 10.1016/j.physletb.2007.08.058 | NYU-TH-07/03/01 | hep-th | null | We consider Bose-Einstein condensation of massive electrically charged
scalars in a uniform background of charged fermions. We focus on the case when
the scalar condensate screens the background charge, while the net charge of
the system resides on its boundary surface. A distinctive signature of this
substance is that the photon acquires a Lorentz-violating mass in the bulk of
the condensate. Due to this mass, the transverse and longitudinal gauge modes
propagate with different group velocities. We give qualitative arguments that
at high enough densities and low temperatures a charged system of electrons and
helium-4 nuclei, if held together by laboratory devices or by force of gravity,
can form such a substance. We briefly discuss possible manifestations of the
charged condensate in compact astrophysical objects.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 14:22:54 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Aug 2007 17:26:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gabadadze",
"Gregory",
""
],
[
"Rosen",
"Rachel A.",
""
]
] |
0706.2305 | Pierre Muller | J.J.Metois, P.Muller | Absolute surface energy determination | 13 pages, 7 figures | Surface Science 548 (2004) 13 | 10.1016/j.susc.2003.11.027 | null | cond-mat.mtrl-sci | null | Experimental determination of absolute surface energies remains a challenge.
We propose a simple method based on two independent measurements on 3D and 2D
equilibrium shapes completed by the analysis of the thermal fluctuation of an
isolated step. Using then basic equations (Wulff' theorem, Gibbs-Thomson
equation, thermodynamics fluctuation of an isolated step) allows us to extract
the absolute surface free energy of a singular face. The so-proposed method can
be applied when (i) all orientations exists on the equilibrium shape, (ii) the
surface stress is isotropic. This procedure is applied to the case of Si(111)
where we find a value between 0.59 Jm-2 and 0.83 Jm-2 at 1373 K.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 14:23:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Metois",
"J. J.",
""
],
[
"Muller",
"P.",
""
]
] |
0706.2306 | Pauli Virtanen | Pauli Virtanen and Tero T. Heikkil\"a | Thermoelectric effects in superconducting proximity structures | 14 pages, 10 figures. 374th WE-Heraus seminar: Spin physics of
superconducting heterostructures, Bad Honnef, 2006 | Appl. Phys. A 89, 625 (2007) | 10.1007/s00339-007-4189-0 | null | cond-mat.supr-con | null | Attaching a superconductor in good contact with a normal metal makes rise to
a proximity effect where the superconducting correlations leak into the normal
metal. An additional contact close to the first one makes it possible to carry
a supercurrent through the metal. Forcing this supercurrent flow along with an
additional quasiparticle current from one or many normal-metal reservoirs makes
rise to many interesting effects. The supercurrent can be used to tune the
local energy distribution function of the electrons. This mechanism also leads
to finite thermoelectric effects even in the presence of electron-hole
symmetry. Here we review these effects and discuss to which extent the existing
observations of thermoelectric effects in metallic samples can be explained
through the use of the dirty-limit quasiclassical theory.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 14:35:14 GMT"
}
] | 2010-06-25T00:00:00 | [
[
"Virtanen",
"Pauli",
""
],
[
"Heikkilä",
"Tero T.",
""
]
] |
0706.2307 | Eugenia Cheng | Eugenia Cheng and Nick Gurski | The periodic table of $n$-categories for low dimensions II: degenerate
tricategories | 51 pages | null | null | null | math.CT | null | We continue the project begun in ``The periodic table of $n$-categories for
low dimensions I'' by examining degenerate tricategories and comparing them
with the structures predicted by the Periodic table. For triply degenerate
tricategories we exhibit a triequivalence with the partially discrete
tricategory of commutative monoids. For the doubly degenerate case we explain
how to construct a braided monoidal category from a given doubly degenerate
category, but show that this does not induce a straightforward comparison
between \bfseries{BrMonCat} and \bfseries{Tricat}. We show how to alter the
natural structure of \bfseries{Tricat} in two different ways to provide a
comparison, but show that only the more brutal alteration yields an
equivalence. Finally we study degenerate tricategories in order to give the
first fully algebraic definition of monoidal bicategories and the full
tricategory structure \bfseries{MonBicat}.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 14:35:45 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Cheng",
"Eugenia",
""
],
[
"Gurski",
"Nick",
""
]
] |
0706.2308 | Pierre Muller | B.Ranguelov, J.J.Metois, P.Muller | Spirals on Si(111) at sublimation and growth: REM and LODREM
observations | 21 pages, 8 figures | Surface Science 600(2006) 4848 | 10.1016/j.susc.2006.08.015 | null | cond-mat.mtrl-sci | null | Using recently proposed improvements of Reflection Electron Microsopy (REM)
we study in perfectly controlled thermodynamics conditions spiral shapes and
spirals on Si(111) surface. It is shown that the new method named low
distortion reflection electron microscopy (LODREM) is a powerful instrument,
resolving in much more details (compared with REM) growth or evaporation
spirals at the crystal surface. More precisely, we examine the distance between
two successive steps of a spiral at growth (or evaporation) with respect to the
supersaturation (or undersaturation). It is found that this distance scales
with an exponent close to -1/2. This result, which deviates from the BCF theory
originates from a non local behavior with a slow kinetic of attachment of the
adatoms at the steps.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 14:43:04 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Ranguelov",
"B.",
""
],
[
"Metois",
"J. J.",
""
],
[
"Muller",
"P.",
""
]
] |
0706.2309 | Masoud Yari | Hans G. Kaper, Shouhong Wang, and Masoud Yari | Formation and Persistence of Spatiotemporal Turing Patterns | null | null | null | null | nlin.PS | null | This article is concerned with the stability and long-time dynamics of
structures arising from a structureless state. The paradigm is suggested by
developmental biology, where morphogenesis is thought to result from a
competition between chemical reactions and spatial diffusion. A system of two
reaction-diffusion equations for the concentrations of two morphogens is
reduced to a finite system of ordinary differential equations. The stability of
bifurcated solutions of this system is analyzed, and the long-time asymptotic
behavior of the bifurcated solutions is established rigorously. The
Schnakenberg and Gierer-Meinhardt equations are discussed as examples.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 14:45:15 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Kaper",
"Hans G.",
""
],
[
"Wang",
"Shouhong",
""
],
[
"Yari",
"Masoud",
""
]
] |
0706.2310 | Nicolas Gresset | Nicolas Gresset, Loic Brunel, Joseph Boutros | Space-time coding techniques with bit-interleaved coded modulations for
MIMO block-fading channels | Submitted to IEEE Trans. on Information Theory, Submission: January
2006 - First review: June 2007 | null | 10.1109/TIT.2008.920240 | null | cs.IT math.IT | null | The space-time bit-interleaved coded modulation (ST-BICM) is an efficient
technique to obtain high diversity and coding gain on a block-fading MIMO
channel. Its maximum-likelihood (ML) performance is computed under ideal
interleaving conditions, which enables a global optimization taking into
account channel coding. Thanks to a diversity upperbound derived from the
Singleton bound, an appropriate choice of the time dimension of the space-time
coding is possible, which maximizes diversity while minimizing complexity.
Based on the analysis, an optimized interleaver and a set of linear precoders,
called dispersive nucleo algebraic (DNA) precoders are proposed. The proposed
precoders have good performance with respect to the state of the art and exist
for any number of transmit antennas and any time dimension. With turbo codes,
they exhibit a frame error rate which does not increase with frame length.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 15:14:01 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Gresset",
"Nicolas",
""
],
[
"Brunel",
"Loic",
""
],
[
"Boutros",
"Joseph",
""
]
] |
0706.2311 | Ren\'e Messina | Lahcen Assoud, Ren\'e Messina and Hartmut L\"owen | Stable crystalline lattices in two-dimensional binary mixtures of
dipolar particles | 6 pages - 2 figs - phase diagram updated | null | 10.1209/0295-5075/80/48001 | null | cond-mat.soft cond-mat.stat-mech | null | The phase diagram of binary mixtures of particles interacting via a pair
potential of parallel dipoles is computed at zero temperature as a function of
composition and the ratio of their magnetic susceptibilities. Using lattice
sums, a rich variety of different stable crystalline structures is identified
including $A_mB_n$ structures. [$A$ $(B)$ particles correspond to large (small)
dipolar moments.] Their elementary cells consist of triangular, square,
rectangular or rhombic lattices of the $A$ particles with a basis comprising
various structures of $A$ and $B$ particles. For small (dipolar) asymmetry
there are intermediate $AB_2$ and $A_2B$ crystals besides the pure $A$ and $B$
triangular crystals. These structures are detectable in experiments on granular
and colloidal matter.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 14:59:37 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Sep 2007 13:32:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Assoud",
"Lahcen",
""
],
[
"Messina",
"René",
""
],
[
"Löwen",
"Hartmut",
""
]
] |
0706.2312 | Andrea Bertoni | Fabrizio Buscemi, Paolo Bordone, Andrea Bertoni | Carrier-carrier entanglement and transport resonances in semiconductor
quantum dots | 8 pages, 6 figures, RevTex4 two-column format, submitted | Phys. Rev. B 76, 195317 (2007) | 10.1103/PhysRevB.76.195317 | null | cond-mat.mes-hall quant-ph | null | We study theoretically the entanglement created in a scattering between an
electron, incoming from a source lead, and another electron bound in the ground
state of a quantum dot, connected to two leads. We analyze the role played by
the different kinds of resonances in the transmission spectra and by the number
of scattering channels, into the amount of quantum correlations between the two
identical carriers. It is shown that the entanglement between their energy
states is not sensitive to the presence of Breit-Wigner resonances, while it
presents a peculiar behavior in correspondence of Fano peaks: two close maxima
separated by a minimum, for a two-channel scattering, a single maximum for a
multi-channel scattering. Such a behavior is ascribed to the different
mechanisms characterizing the two types of resonances. Our results suggest that
the production and detection of entanglement in quantum dot structures may be
controlled by the manipulation of Fano resonances through external fields.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 15:07:10 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Buscemi",
"Fabrizio",
""
],
[
"Bordone",
"Paolo",
""
],
[
"Bertoni",
"Andrea",
""
]
] |
0706.2313 | Enrique Mac\'ias-Virg\'os | E. Macias-Virgos, E. Sanmartin-Carbon | Cohomology of diffeological spaces and foliations | 6 pages | null | null | null | math.DG | null | Let (M,F) be a foliated manifold. We study the relationship between the basic
cohomology Hb(M,F) of the foliation and the De Rham cohomology H(DF) of the
space of leaves M/F as a quotient diffeological space. We prove that for an
arbitrary foliation there is a morphism from H(DF) to Hb(M,F). It is an
isomorphism when F is a Q-foliation.
| [
{
"version": "v1",
"created": "Fri, 15 Jun 2007 15:13:44 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Macias-Virgos",
"E.",
""
],
[
"Sanmartin-Carbon",
"E.",
""
]
] |
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