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712.2679
Ali Naji
Ali Naji, Frank L. H. Brown
Diffusion on Ruffled Membrane Surfaces
18 pages, 12 figures
J. Chem. Phys. 126, 235103 (2007)
10.1063/1.2739526
null
cond-mat.soft cond-mat.stat-mech
null
We present a position Langevin equation for overdamped particle motion on rough two-dimensional surfaces. A Brownian Dynamics algorithm is suggested to evolve this equation numerically, allowing for the prediction of effective (projected) diffusion coefficients over corrugated surfaces. In the case of static surface roughness, we find that a simple area-scaling prediction for the projected diffusion coefficient leads to seemingly quantitative agreement with numerical results. To study the effect of dynamic surface evolution on the diffusive process, we consider particle diffusion over a thermally fluctuating elastic membrane. Surface fluctuation has the effect of increasing the effective diffusivity toward a limiting annealed-surface value discussed previously. We argue that protein motion over cell surfaces spans a variety of physical regimes, making it impossible to identify a single approximation scheme appropriate to all measurements of interest.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 10:53:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Naji", "Ali", "" ], [ "Brown", "Frank L. H.", "" ] ]
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712.268
Vladimir Kotlyar
V. Kotlyar
Tensor and Operator Forms of 3He and 3H Wave Functions for Parity-Violating Nuclear Forces
16 pages
null
null
null
nucl-th
null
Tensor representation (TR) for wave function (WF) of three-nucleon bound state with the total angular momentum I=1/2 is discussed. The WF in TR has 16 complex components depending on vectors of relative momenta. Constraints on the WF imposed by requirements of invariance with respect to space inversion and time reversal are studied. Both parity-even and parity-odd components of the 3N bound state are constructed using 16 scalar functions. The arguments of the functions are magnitudes of relative momenta and scalar product of the momenta. With nuclear forces being time-reversal invariant these functions are real. The WF in TR is converted into an operator form, accounting for parity violating contributions. Properties of operator representations for WFs of 2N and 3N nuclei are compared.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 10:54:15 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 21:32:35 GMT" } ]
2007-12-18T00:00:00
[ [ "Kotlyar", "V.", "" ] ]
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712.2681
Chen Jacoby
Chen Jacoby and Shmuel Nussinov
The Relic Abundance of Massive Colored Particles after a Late Hadronic Annihilation Stage
28 pages, 2 figures
null
null
TAUP-2867-07
hep-ph astro-ph
null
We discuss the relic abundance of massive long lived colored particles with mass of the order of 1 TeV. We first examine the case where the massive colored particles have the standard color only. Next we consider the "Quirk Model" suggested by M. Luty, in which the colored particles transform under an additional non-abelian gauge group with a scale much smaller than the particles' mass. In both cases, the relic abundance is reduced via a "late" hadronic annihilation stage. In the second case the relic Quirks bind to ordinary quarks forming fractional charged objects and also anomalous heavy isotopes, and the bounds on the relic abundance become extremely severe. The force between Quirks, however, has a new confining part that manifests via macroscopic strings and the resulting efficient "very late" annihilations reduce the relic abundance to acceptable levels. The prospects of creating and detecting such particles at LHC and the fate of the particles created are discussed.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:07:26 GMT" } ]
2007-12-18T00:00:00
[ [ "Jacoby", "Chen", "" ], [ "Nussinov", "Shmuel", "" ] ]
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712.2682
Kai Puolamaki
Kai Puolam\"aki, Sami Hanhij\"arvi, Gemma C. Garriga
An Approximation Ratio for Biclustering
9 pages, 2 figures; presentation clarified, replaced to match the version to be published in IPL
Information Processing Letters 108 (2008) 45-49
10.1016/j.ipl.2008.03.013
Publications in Computer and Information Science E13
cs.DS stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of biclustering consists of the simultaneous clustering of rows and columns of a matrix such that each of the submatrices induced by a pair of row and column clusters is as uniform as possible. In this paper we approximate the optimal biclustering by applying one-way clustering algorithms independently on the rows and on the columns of the input matrix. We show that such a solution yields a worst-case approximation ratio of 1+sqrt(2) under L1-norm for 0-1 valued matrices, and of 2 under L2-norm for real valued matrices.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:45:42 GMT" }, { "version": "v2", "created": "Fri, 22 Aug 2008 07:01:26 GMT" } ]
2008-08-22T00:00:00
[ [ "Puolamäki", "Kai", "" ], [ "Hanhijärvi", "Sami", "" ], [ "Garriga", "Gemma C.", "" ] ]
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712.2683
Guy Trambly de Laissardiere
G. Trambly de Laissardi\`ere, J. P. Julien, D. Mayou
Electronic transport in AlMn(Si) and AlCuFe quasicrystals: Break-down of the semiclassical model
11 pages, 5 figures
Phil. Mag. B 88, 13 - 15 (2008) 2131 - 2144
10.1080/14786430801894544
null
cond-mat.mtrl-sci
null
The semi-classical Bloch-Boltzmann theory is at the heart of our understanding of conduction in solids, ranging from metals to semi-conductors. Physical systems that are beyond the range of applicability of this theory are thus of fundamental interest. It appears that in quasicrystals and related complex metallic alloys, a new type of break-down of this theory operates. This phenomenon is related to the specific propagation of electrons. We develop a theory of quantum transport that applies to a normal ballistic law but also to these specific diffusion laws. As we show phenomenological models based on this theory describe correctly the anomalous conductivity in quasicrystals. Ab-initio calculations performed on approximants confirm also the validity of this anomalous quantum diffusion scheme. This provides us with an ab-initio model of transport in approximants such as alpha-AlMnSi and AlCuFe 1/1 cubic approximant.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:02:37 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 13:48:31 GMT" } ]
2009-04-10T00:00:00
[ [ "de Laissardière", "G. Trambly", "" ], [ "Julien", "J. P.", "" ], [ "Mayou", "D.", "" ] ]
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712.2684
Ricardo Lopez-Ruiz
R. Lopez-Ruiz, J. Gonzalez-Estevez, M.G. Cosenza, and J.R. Sanchez
An Economic Model of Coupled Exponential Maps
3 pages, 1 figure ; Presented at NOMA'07 Conference, December 2007, Toulouse (France)
null
null
null
q-fin.GN cs.MA nlin.AO physics.soc-ph
null
In this work, an ensemble of economic interacting agents is considered. The agents are arranged in a linear array where only local couplings are allowed. The deterministic dynamics of each agent is given by a map. This map is expressed by two factors. The first one is a linear term that models the expansion of the agent's economy and that is controlled by the {\it growth capacity parameter}. The second one is an inhibition exponential term that is regulated by the {\it local environmental pressure}. Depending on the parameter setting, the system can display Pareto or Boltzmann-Gibbs behavior in the asymptotic dynamical regime. The regions of parameter space where the system exhibits one of these two statistical behaviors are delimited. Other properties of the system, such as the mean wealth, the standard deviation and the Gini coefficient, are also calculated.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:02:58 GMT" } ]
2008-12-02T00:00:00
[ [ "Lopez-Ruiz", "R.", "" ], [ "Gonzalez-Estevez", "J.", "" ], [ "Cosenza", "M. G.", "" ], [ "Sanchez", "J. R.", "" ] ]
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712.2685
Ryushi Goto
Ryushi Goto
Poisson structures and generalized Kahler structures
25 pages, added references, corrected typos
J. Math. Soc. Japan, Vol. 61, No. 1 (2009) pp.107-132
null
null
math.DG
null
Let X be a compact Kahler manifold with a non-trivial holomorphic Poisson structure. Then there exist deformations of non-trivial generalized Kahler structures with one pure spinor on X. We prove that every Poisson submanifold of X is a generalized Kahler submanifold with respect to the deformed generalized Kahler structures and provide non-trivial examples of generalized Kahler submanifolds arising as holomorphic Poisson submanifolds. We also obtain unobstructed deformations of bi-Hermitian structures constructed from Poisson structures.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 12:51:59 GMT" }, { "version": "v2", "created": "Mon, 10 Mar 2008 04:05:43 GMT" } ]
2009-07-16T00:00:00
[ [ "Goto", "Ryushi", "" ] ]
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712.2686
Noureddine Chair
Noureddine Chair
Comment on "Remark on the renormalization group equation for the Penner model"
4 pages
Phys.Rev.D75:127901,2007
10.1103/PhysRevD.75.127901
null
hep-th
null
We show explicitly that the sum over punctures for the three times derivative for the Penner free energy $F_{0}^{3}$, given by D.A. Johnston, Phys.Rev.D 51 (1995) is not correct. As a consequence, Eq.(21), the differentiated version for the renormalization group (RG) equation, is wrong. Also, his conclusion that the differentiated version of the (RG) equation for the three-times derivative of the free energy can be obtained from the higher genus (RG) equation can not be true. Finally, the differentiated version of the (RG) equation is extended to any $s$ derivative of the free energy $F_{0}$.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:10:58 GMT" } ]
2008-11-26T00:00:00
[ [ "Chair", "Noureddine", "" ] ]
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712.2687
Bence T\'oth
Bence Toth, Enrico Scalas
The value of information in financial markets: An agent-based simulation
25 pages, 7 figures invited paper to "Information, Interaction, and (In)Efficiency in Financial Markets" edited by Juergen Huber and Michael Hanke
null
null
null
q-fin.TR physics.soc-ph
null
We present results on simulations of a stock market with heterogeneous, cumulative information setup. We find a non-monotonic behaviour of traders' returns as a function of their information level. Particularly, the average informed agents underperform random traders; only the most informed agents are able to beat the market. We also study the effect of a strategy updating mechanism, when traders have the possibility of using other pieces of information than the fundamental value. These results corroborate the latter ones: it is only for the most informed player that it is rewarding to stay fundamentalist. The simulations reproduce some stylized facts of tick-by-tick stock-exchange data and globally show informational efficiency.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:13:24 GMT" } ]
2008-12-02T00:00:00
[ [ "Toth", "Bence", "" ], [ "Scalas", "Enrico", "" ] ]
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712.2688
L. Sunil Chandran
L. Sunil Chandran, Anita Das, Chintan Shah
Cubicity, Boxicity and Vertex Cover
12 pages
null
null
null
math.CO
null
A $k$-dimensional box is the cartesian product $R_1 \times R_2 \times ... \times R_k$ where each $R_i$ is a closed interval on the real line. The {\it boxicity} of a graph $G$, denoted as $box(G)$, is the minimum integer $k$ such that $G$ is the intersection graph of a collection of $k$-dimensional boxes. A unit cube in $k$-dimensional space or a $k$-cube is defined as the cartesian product $R_1 \times R_2 \times ... \times R_k$ where each $R_i$ is a closed interval on the real line of the form $[a_i, a_{i}+1]$. The {\it cubicity} of $G$, denoted as $cub(G)$, is the minimum $k$ such that $G$ is the intersection graph of a collection of $k$-cubes. In this paper we show that $cub(G) \leq t + \left \lceil \log (n - t)\right\rceil - 1$ and $box(G) \leq \left \lfloor\frac{t}{2}\right\rfloor + 1$, where $t$ is the cardinality of the minimum vertex cover of $G$ and $n$ is the number of vertices of $G$. We also show the tightness of these upper bounds. F. S. Roberts in his pioneering paper on boxicity and cubicity had shown that for a graph $G$, $box(G) \leq \left \lfloor\frac{n}{2} \right \rfloor$, where $n$ is the number of vertices of $G$, and this bound is tight. We show that if $G$ is a bipartite graph then $box(G) \leq \left \lceil\frac{n}{4} \right\rceil$ and this bound is tight. We point out that there exist graphs of very high boxicity but with very low chromatic number. For example there exist bipartite (i.e., 2 colorable) graphs with boxicity equal to $\frac{n}{4}$. Interestingly, if boxicity is very close to $\frac{n}{2}$, then chromatic number also has to be very high. In particular, we show that if $box(G) = \frac{n}{2} - s$, $s \geq 0$, then $\chi(G) \geq \frac{n}{2s+2}$, where $\chi(G)$ is the chromatic number of $G$.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:15:18 GMT" } ]
2007-12-18T00:00:00
[ [ "Chandran", "L. Sunil", "" ], [ "Das", "Anita", "" ], [ "Shah", "Chintan", "" ] ]
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712.2689
Ali Naji
Ali Naji, Alex J. Levine, Philip A. Pincus
Corrections to the Saffman-Delbruck mobility for membrane bound proteins
3 pages, 1 figure
Biophys. J. (Biophys. Lett.) 93, L49 (2007)
10.1529/biophysj.107.119222
null
cond-mat.soft cond-mat.stat-mech
null
Recent experiments by Y. Gambin et al. [PNAS 103, 2098 (2006)] have called into question the applicability of the Saffman-Delbruck diffusivity for proteins embedded in the lipid bilayers. We present a simple argument to account for this observation that should be generically valid for a large class of transmembrane and membrane bound proteins. Whenever the protein-lipid interactions locally deform the membrane, that deformation generates new hydrodynamic stresses on the protein-membrane complex leading to a suppression of its mobility. We show that this suppression depends on the protein size in a manner consistent with the work of Y. Gambin et al.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:21:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Naji", "Ali", "" ], [ "Levine", "Alex J.", "" ], [ "Pincus", "Philip A.", "" ] ]
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712.269
Utpal Sarkar
Utpal Sarkar
Importance of neutrinoless double beta decay
Invited talk appeared in Neutrinoless Double Beta Decay, ed. V.K.B. Kota and U. Sarkar, Narosa Publishing House, New Delhi, 2007, p.11-20
null
null
null
hep-ph
null
A natural explanation for the smallness of the neutrino mass requires them to be Majorana particles violating lepton number by two units. Since lepton number violation can have several interesting consequences in particle physics and cosmology, it is of utmost importance to find out if there is lepton number violation in nature and what is its magnitude. The neutrinoless double beta decay experiment can answer these questions: if there is lepton number violation and if neutrinos are Majorana particles. In addition, the magnitude of neutrinoless double beta decay will constrain any other lepton number violating processes. This lepton number violation may also be relatd to the matter-antimatter asymmetry of the universe, dark matter and cosmological constant.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:24:21 GMT" } ]
2007-12-18T00:00:00
[ [ "Sarkar", "Utpal", "" ] ]
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712.2691
Vasily Mochalov
A.N.Vasiliev, V.V.Mochalov, S.I.Alekhin, N.A.Bazhanov, N.I.Belikov, A.A.Belyaev, N.S.Borisov, B.V.Chujko, Y.M.Goncharenko, V.N.Grishin, A.M.Davidenko, A.A.Derevschikov, V.A.Kachanov, V.Y.Kharlov, A.S.Kozhin, D.A.Konstantinov, V.G.Kolomiets, V.A.Kormilitsin, V.I.Kravtsov, A.B.Lazarev, A.K.Likhoded, A.V.Luchinsky, A.A.Lukhanin, Yu.A.Matulenko, Yu.M.Melnick, A.P.Meschanin, N.G.Minaev, D.A.Morozov, A.B.Neganov, L.V.Nogach, S.B.Nurushev, Yu.A.Plis, A.F.Prudkoglyad, A.V.Ryazantsev, P.A.Semenov, O.N.Shchevelev, S.R.Slabospitsky, L.F.Soloviev, M.N.Ukhanov, Yu.A.Usov, A.V.Uzunian, A.S.Vovenko, A.E.Yakutin
New Polarization Program at U70 (SPASCHARM Project)
Talk given at XII Workshop on High Energy Spin Physics (Dubna-SPIN-07)
null
null
null
hep-ex
null
The new polarization program SPASCHARM is being prepared in Protvino. The program has two stages. The first stage is dedicated to single-spin asymmetries in the production of miscellaneous light resonances with the use of 34 GeV $\pi^-$-beam. Inclusive and exclusive reactions will be studied simultaneously. The second stage is dedicated to single-spin and double-spin asymmetries in charmonium production with the use of 70 GeV polarized proton beam which will allow us to understand charmonium hadronic production mechanism and make gluon polarization $\Delta g(x)$ extraction at large $x$.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:25:36 GMT" } ]
2007-12-18T00:00:00
[ [ "Vasiliev", "A. N.", "" ], [ "Mochalov", "V. V.", "" ], [ "Alekhin", "S. I.", "" ], [ "Bazhanov", "N. A.", "" ], [ "Belikov", "N. I.", "" ], [ "Belyaev", "A. A.", "" ], [ "Borisov", "N. S.", "" ], [ "Chujko", "B. V.", "" ], [ "Goncharenko", "Y. M.", "" ], [ "Grishin", "V. N.", "" ], [ "Davidenko", "A. M.", "" ], [ "Derevschikov", "A. A.", "" ], [ "Kachanov", "V. A.", "" ], [ "Kharlov", "V. Y.", "" ], [ "Kozhin", "A. S.", "" ], [ "Konstantinov", "D. A.", "" ], [ "Kolomiets", "V. G.", "" ], [ "Kormilitsin", "V. A.", "" ], [ "Kravtsov", "V. I.", "" ], [ "Lazarev", "A. B.", "" ], [ "Likhoded", "A. K.", "" ], [ "Luchinsky", "A. V.", "" ], [ "Lukhanin", "A. A.", "" ], [ "Matulenko", "Yu. A.", "" ], [ "Melnick", "Yu. M.", "" ], [ "Meschanin", "A. P.", "" ], [ "Minaev", "N. G.", "" ], [ "Morozov", "D. A.", "" ], [ "Neganov", "A. B.", "" ], [ "Nogach", "L. V.", "" ], [ "Nurushev", "S. B.", "" ], [ "Plis", "Yu. A.", "" ], [ "Prudkoglyad", "A. F.", "" ], [ "Ryazantsev", "A. V.", "" ], [ "Semenov", "P. A.", "" ], [ "Shchevelev", "O. N.", "" ], [ "Slabospitsky", "S. R.", "" ], [ "Soloviev", "L. F.", "" ], [ "Ukhanov", "M. N.", "" ], [ "Usov", "Yu. A.", "" ], [ "Uzunian", "A. V.", "" ], [ "Vovenko", "A. S.", "" ], [ "Yakutin", "A. E.", "" ] ]
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712.2692
Charles Bonatto
Eduardo Bica and Charles Bonatto
A populous intermediate-age open cluster and evidence of an embedded cluster among the FSR globular cluster candidates
9 pages and 6 figs. Accepted by MNRAS
null
10.1111/j.1365-2966.2008.12863.x
null
astro-ph
null
We study the nature of the globular cluster (GC) candidates FSR 1603 and FSR 1755 selected from the catalogue of \citet{FSRcat}. Their properties are investigated with 2MASS field-star decontaminated photometry, which is used to build colour-magnitude diagrams (CMDs), and stellar radial density profiles (RDPs). FSR 1603 has the open cluster (OC) Ruprecht 101 as optical counterpart, and we show it to be a massive intermediate age cluster (IAC). Relevant parameters of FSR 1603 are the age $\approx1$ Gyr, distance from the Sun $\ds\approx2.7$ kpc, Galactocentric distance $\dgc\approx6.4$ kpc, core radius $\rc\approx1.1$ pc, mass function slope $\chi\approx1.8$, observed stellar mass (for stars with mass in the range $\rm 1.27 \ms\leq m\leq2.03 \ms$) $\mObs\approx500 \ms$, and a total (extrapolated to $\rm m=0.08 \ms$) stellar mass $\mTot\approx2300 \ms$. FSR 1755, on the other hand, is not a populous cluster. It may be a sparse young cluster embedded in the H II region Sh2-3, subject to an absorption $\aV\approx4.1$, located at $\ds\approx1.3$ kpc. Important field-star contamination, spatially-variable heavy dust obscuration, even in \ks, and gas emission characterise its field. A nearly vertical, sparse blue stellar sequence shows up in the CMDs.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:25:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Bica", "Eduardo", "" ], [ "Bonatto", "Charles", "" ] ]
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712.2693
Gautam Bhattacharyya
Gautam Bhattacharyya, Gustavo C. Branco, S. Nandi
Universal Doublet-Singlet Higgs Couplings and phenomenology at the CERN Large Hadron Collider
5 pages, no figures; v2: normalisations settled, results unchanged, References added; v3: a new section 'Deviation from universality' added, version to appear in Phys Rev D (Brief Reports section)
Phys.Rev.D77:117701,2008
10.1103/PhysRevD.77.117701
CERN-PH-TH/2007-264, OSU/HEP/07-07, SINP/TNP/07-33
hep-ph
null
We consider a minimal extension of the standard model where a real, gauge singlet scalar field is added to the standard spectrum. Introducing the Ansatz of universality of scalar couplings, we are led to a scenario which has a set of very distinctive and testable predictions: (i) the mixing between the standard model Higgs and the new state is near maximal, (ii) the ratio of the two Higgs mass eigenstates is fixed ($\sim \sqrt{3}$), (iii) the decay modes of each of the two eigenstates are standard model like. We also study how electroweak precision tests constrain this scenario. We predict the lighter Higgs to lie in the range of 114 and 145 GeV, and hence the heavier one between 198 and 250 GeV. The predictions of the model can be tested at the upcoming LHC.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 13:34:44 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 06:30:25 GMT" }, { "version": "v3", "created": "Tue, 3 Jun 2008 13:42:26 GMT" } ]
2008-11-26T00:00:00
[ [ "Bhattacharyya", "Gautam", "" ], [ "Branco", "Gustavo C.", "" ], [ "Nandi", "S.", "" ] ]
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712.2694
Jiangfeng Du
Jiang-Feng Du, Jing Zhu, Ming-Guang Hu, and Jing-Ling Chen
Experimental simulation of fractional statistics of abelian anyons in the Kitaev lattice-spin model
5 pages, 4 figures
null
null
null
quant-ph
null
In two-dimensions, the laws of physics even permit the existence of anyons which exhibit fractional statistics ranging continuously from bosonic to fermionic behaviour. They have been responsible for the fractional quantum Hall effect and proposed as candidates for naturally fault-tolerant quantum computation. Despite these remarkable properties, the fractional statistics of anyons has never been observed in nature directly. Here we report the demonstration of fractional statistics of anyons by simulation of the first Kitaev lattice-spin model on a nuclear magnetic resonance system. We encode four-body interactions of the lattice-spin model into two-body interactions of an Ising spin chain in molecules. It can thus efficiently prepare and operate the ground state and excitations of the model Hamiltonian. This quantum system with convenience of manipulation and detection of abelian anyons reveals anyonic statistical properties distinctly. Our experiment with interacted Hamiltonian could also prove useful in the long run to the control and application of anyons.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:36:31 GMT" } ]
2007-12-18T00:00:00
[ [ "Du", "Jiang-Feng", "" ], [ "Zhu", "Jing", "" ], [ "Hu", "Ming-Guang", "" ], [ "Chen", "Jing-Ling", "" ] ]
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712.2695
Rinat Kedem
Rinat Kedem
Q-systems as cluster algebras
16 pages, 3 figures
J.Phys.A41:194011,2008
10.1088/1751-8113/41/19/194011
null
math.RT math.QA
null
Q-systems first appeared in the analysis of the Bethe equations for the XXX-model and generalized Heisenberg spin chains. Such systems are known to exist for any simple Lie algebra and many other Kac-Moody algebras. We formulate the Q-system associated with any simple, simply-laced Lie algebras g in the language of cluster algebras, and discuss the relation of the polynomiality property of the solutions of the $Q$-system in the initial variables, which follows from the representation-theoretical interpretation, to the Laurent phenomenon in cluster algebras.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:42:16 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 13:42:23 GMT" }, { "version": "v3", "created": "Sun, 2 Mar 2008 02:46:32 GMT" } ]
2008-11-26T00:00:00
[ [ "Kedem", "Rinat", "" ] ]
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712.2696
Graham Everest
Graham Everest, Patrick Ingram, Valery Mahe, Shaun Stevens
The uniform primality conjecture for elliptic curves
24 pages, 1 figure
null
10.4064/aa134-2-7
null
math.NT
null
An elliptic divisibility sequence, generated by a point in the image of a rational isogeny, is shown to possess a uniformly bounded number of prime terms. This result applies over the rational numbers, assuming Lang's conjecture, and over the rational function field, unconditionally. In the latter case, a uniform bound is obtained on the index of a prime term. Sharpened versions of these techniques are shown to lead to explicit results where all the irreducible terms can be computed.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:47:10 GMT" } ]
2015-05-13T00:00:00
[ [ "Everest", "Graham", "" ], [ "Ingram", "Patrick", "" ], [ "Mahe", "Valery", "" ], [ "Stevens", "Shaun", "" ] ]
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712.2697
Paulo M. S\'a
Paulo M. S\'a and Alfredo B. Henriques
Parametric Resonance and Cosmological Gravitational Waves
8 pages, 7 figures
Phys.Rev.D77:064002,2008
10.1103/PhysRevD.77.064002
null
astro-ph
null
We investigate the production of gravitational waves due to quantum fluctuations of the vacuum during the transition from the inflationary to the radiation-dominated eras of the universe, assuming this transition to be dominated by the phenomenon of parametric resonance. The energy spectrum of the gravitational waves is calculated using the method of continuous Bogoliubov coefficients, which avoids the problem of overproduction of gravitons at large frequencies. We found, on the sole basis of the mechanism of quantum fluctuations, that the resonance field leaves no explicit and distinctive imprint on the gravitational-wave energy spectrum, apart an overall upward or downward translation. Therefore, the main features in the spectrum are due to the inflaton field, which leaves a characteristic imprint at frequencies of the order of MHz/GHz.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:47:16 GMT" } ]
2008-12-18T00:00:00
[ [ "Sá", "Paulo M.", "" ], [ "Henriques", "Alfredo B.", "" ] ]
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712.2698
Radoslaw Wojtak
Radoslaw Wojtak, Ewa L. Lokas
Mass modelling of Abell 2634: avoiding the interloper bias
6 pages, 3 figures, contribution to the proceedings of XIX Rencontres de Blois
null
null
null
astro-ph
null
Using an example of the Abell 2634 galaxy cluster we discuss the effect of contamination of kinematic data by interlopers and its impact on mass modelling. The cluster data reveal rich substructure along the line of sight. We demonstrate that it is necessary to apply a few independent methods of interloper removal in order to obtain a reliable sample of cluster members. We present results of three such methods which are commonly used in the literature and have been recently extensively tested on simulated data. Only two of them lead to consistent and reliable samples of cluster galaxies. For both of them we provide parameters of the best-fitting NFW density profile by fitting an isotropic solution of the Jeans equation to the velocity dispersion profiles.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 12:05:35 GMT" } ]
2007-12-18T00:00:00
[ [ "Wojtak", "Radoslaw", "" ], [ "Lokas", "Ewa L.", "" ] ]
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712.2699
Martin Kurth
Martin Kurth
Square root voting in the Council of the European Union: Rounding effects and the Jagiellonian Compromise
Reference style changed. Preprint submitted to Elsevier
null
null
null
math.GM
null
In recent years, enlargement of the European Union has brought with it renewed discussion of voting arrangements in the Council of the EU. During these negotiations, the Polish government proposed a voting scheme that gives each country a voting weight proportional to the square root of its population, and sets a quota according to an optimality condition ("Jagiellonian Compromise"). In this paper, the optimal quota is found exactly for the current population data from the 27 EU member states, and it is found that rounding of the voting weights can be used to improve the voting scheme.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:57:53 GMT" }, { "version": "v2", "created": "Mon, 19 May 2008 13:38:34 GMT" } ]
2008-05-19T00:00:00
[ [ "Kurth", "Martin", "" ] ]
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712.27
Jambul Gegelia
D. Djukanovic, J. Gegelia, S. Scherer, M. R. Schindler
Two-nucleon problem in semi-relativistic baryon chiral perturbation theory
3 pages, talk given at 20th European Conference on Few-Body Problems in Physics (EFB 20), Pisa, Italy, 10-14 Sep 2007
Few Body Syst.44:117-119,2008
10.1007/s00601-008-0270-2
null
nucl-th
null
We consider a symmetry-preserving approach to the nucleon-nucleon scattering problem in the framework of the higher-derivative formulation of baryon chiral perturbation theory. Within this framework the leading-order amplitude is calculated by solving renormalizable equations and corrections are taken into account perturbatively.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:58:07 GMT" } ]
2009-01-16T00:00:00
[ [ "Djukanovic", "D.", "" ], [ "Gegelia", "J.", "" ], [ "Scherer", "S.", "" ], [ "Schindler", "M. R.", "" ] ]
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712.2701
Valery Pipin
V.V. Pipin
The shear-induced alpha-effect and long-term variations in solar dynamo
AOGS 2nd Annual Meeting 2005
null
null
null
astro-ph
null
The consequences of the shear-induced alpha effect to the long-term modulation of magnetic activity are examined with the help of the axisymmetric numerical dynamo model that includes the self-consistent description of the angular momentum balance, heat transport and magnetic field generation in the spherical shell. We find that the shear contributions to alpha effect can complicate the long-term behaviour of the large-scale magnetic activity and differential rotation in nonlinear dynamo. Additionally we consider the impact secular magnetic activity variations to the secular modulations of the solar luminosity and radius.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 12:09:19 GMT" } ]
2007-12-18T00:00:00
[ [ "Pipin", "V. V.", "" ] ]
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712.2702
Christa Guse
Zolt\'an Fodor, Christa Guse, S\'andor D. Katz and K\'alm\'an K. Szab\'o
Curvature of the phase transition line in the mu-T plane
7 pages, 5 figures; format adjusted
PoSLAT2007:189,2007
null
null
hep-lat
null
We determined the curvature of the phase transition line in the mu-T plane using a Taylor expansion in mu. The Polyakov loop and the strange quark number susceptibility were measured to locate the pseudocritical line. The analysis was carried out on Nt=4,6,8,10 lattices generated with a Symanzik improved gauge and stout-link improved (2+1) flavour staggered fermion action using physical quark masses.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 12:10:02 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 07:59:25 GMT" } ]
2009-04-14T00:00:00
[ [ "Fodor", "Zoltán", "" ], [ "Guse", "Christa", "" ], [ "Katz", "Sándor D.", "" ], [ "Szabó", "Kálmán K.", "" ] ]
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712.2703
Hideo Kodama
Hideo Kodama
Perturbations and Stability of Higher-Dimensional Black Holes
45 pages, 9 figures. Based on the lecture given at the 4th Aegean Summer School. References added and typos corrected
Lect.Notes Phys.769:427-470,2009
10.1007/978-3-540-88460-6_11
null
hep-th gr-qc
null
In this lecture, I explain the gauge-invariant formulation for perturbations of background spacetimes with untwisted homologous Einstein fibres, which include lots of practically important spacetimes such as static black holes, static black branes and rotating black holes in various dimensions. As applications, we discuss the stability of static black holes in higher dimensions and flat black branes.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 12:20:28 GMT" }, { "version": "v2", "created": "Wed, 2 Jan 2008 19:48:22 GMT" } ]
2009-01-28T00:00:00
[ [ "Kodama", "Hideo", "" ] ]
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712.2704
Fernando Parisio
Fernando Parisio
On Bargmann Representations of Wigner Function
accepted for publication in J. Phys. A: Math. and Theor
null
10.1088/1751-8113/41/5/055305
null
quant-ph
null
By using the localized character of canonical coherent states, we give a straightforward derivation of the Bargmann integral representation of Wigner function (W). A non-integral representation is presented in terms of a quadratic form V*FV, where F is a self-adjoint matrix whose entries are tabulated functions and V is a vector depending in a simple recursive way on the derivatives of the Bargmann function. Such a representation may be of use in numerical computations. We discuss a relation involving the geometry of Wigner function and the spacial uncertainty of the coherent state basis we use to represent it.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 12:25:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Parisio", "Fernando", "" ] ]
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712.2705
Antonio Trovato
Antonio Trovato, Trinh X. Hoang, Jayanth R. Banavar, Amos Maritan
Symmetry, shape, and order
25 pages, 11 figures
Proc Natl Acad Sci USA 104: 19187-19192 (2007)
10.1073/pnas.0707523104
null
cond-mat.stat-mech cond-mat.soft
null
Packing problems have been of great interest in many diverse contexts for many centuries. The optimal packing of identical objects has been often invoked to understand the nature of low temperature phases of matter. In celebrated work, Kepler conjectured that the densest packing of spheres is realized by stacking variants of the face-centered cubic lattice and has a packing fraction of $\pi/(3\sqrt{2}) \sim 0.7405$. Much more recently, an unusually high density packing of approximately 0.770732 was achieved for congruent ellipsoids. Such studies are relevant for understanding the structure of crystals, glasses, the storage and jamming of granular materials, ceramics, and the assembly of viral capsid structures. Here we carry out analytical studies of the stacking of close-packed planar layers of systems made up of truncated cones possessing uniaxial symmetry. We present examples of high density packing whose order is characterized by a {\em broken symmetry} arising from the shape of the constituent objects. We find a biaxial arrangement of solid cones with a packing fraction of $\pi/4$. For truncated cones, there are two distinct regimes, characterized by different packing arrangements, depending on the ratio $c$ of the base radii of the truncated cones with a transition at $c^*=\sqrt{2}-1$.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 12:26:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Trovato", "Antonio", "" ], [ "Hoang", "Trinh X.", "" ], [ "Banavar", "Jayanth R.", "" ], [ "Maritan", "Amos", "" ] ]
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712.2706
Pinaki Roy
T. Jana and P. Roy
A class of exactly solvable Schroedinger equation with moving boundary conditions
null
null
10.1016/j.physleta.2007.12.002
null
math-ph math.MP
null
Using first and second order supersymmetry formalism we obtain a class of exactly solvable potentials subject to moving boundary conditions.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 12:30:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Jana", "T.", "" ], [ "Roy", "P.", "" ] ]
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712.2707
Daniele Binosi
Daniele Binosi and Joannis Papavassiliou
Gauge-invariant truncation scheme for the Schwinger-Dyson equations of QCD
9 pages, 2 figures
Phys.Rev.D77:061702,2008
10.1103/PhysRevD.77.061702
ECT*-07-28
hep-ph
null
We present a new truncation scheme for the Schwinger-Dyson equations of QCD that respects gauge invariance at any level of the dressed loop expansion. When applied to the gluon self-energy, it allows for its non-perturbative treatment without compromising the transversality of the solution, even when entire sets of diagrams (most notably the ghost loops) are omitted, or treated perturbatively.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:11:27 GMT" } ]
2008-11-26T00:00:00
[ [ "Binosi", "Daniele", "" ], [ "Papavassiliou", "Joannis", "" ] ]
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712.2708
A. C. Davison
A. C. Davison, N. Sartori
The Banff Challenge: Statistical Detection of a Noisy Signal
Published in at http://dx.doi.org/10.1214/08-STS260 the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Statistical Science 2008, Vol. 23, No. 3, 354-364
10.1214/08-STS260
IMS-STS-STS260
stat.AP stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Particle physics experiments such as those run in the Large Hadron Collider result in huge quantities of data, which are boiled down to a few numbers from which it is hoped that a signal will be detected. We discuss a simple probability model for this and derive frequentist and noninformative Bayesian procedures for inference about the signal. Both are highly accurate in realistic cases, with the frequentist procedure having the edge for interval estimation, and the Bayesian procedure yielding slightly better point estimates. We also argue that the significance, or $p$-value, function based on the modified likelihood root provides a comprehensive presentation of the information in the data and should be used for inference.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 12:49:56 GMT" }, { "version": "v2", "created": "Thu, 17 Feb 2011 14:06:16 GMT" } ]
2011-02-18T00:00:00
[ [ "Davison", "A. C.", "" ], [ "Sartori", "N.", "" ] ]
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712.2709
Svetla Drenska Bogomilova
S.Drenska, M.I.Ivanov and N.Minkov
sp(4,R)-systematics of atomic nuclei. F-multiplets and nuclear structure
13 pages, 20 figures
null
null
null
nucl-th
null
A systematics of the atomic nuclei in the frame of the nucleon number $A = Z + N$ and the proton-neutron difference $F = Z - N$ is considered. The classification scheme is provided by means of the non-compact algebra $sp(4,R)$. In this scheme the nuclei are ordered into isobaric multiplets, for which $A={fix}$, as well as in F-multiplets, for which $F={fix}$. The dependence of the mass excess $\Delta$, the first exited states $E_{2^+}$ and the ratio $R_2=E_{4^+}/E_{2^+}$ on the nucleon number $A$ is empirically investigated within the $F$-multiplets. Appropriate filters are used to study the properties of the mass excess. Many structural effects are observed. The mirror symmetry is clearly indicated for the energy levels of the nuclei with the same value of $A$ and opposite $F$-values.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:15:06 GMT" } ]
2007-12-18T00:00:00
[ [ "Drenska", "S.", "" ], [ "Ivanov", "M. I.", "" ], [ "Minkov", "N.", "" ] ]
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712.271
Jacques Soffer
Jacques Soffer
Nucleon spin structure and QCD spin physics
10 Pages, 7 Figures, Invited Lecture at the Workshop DUBNA-SPIN 07, Dubna, Russia, Sept. 02-09, 2007
null
null
null
hep-ph
null
Our knowledge of the nucleon spin structure has greatly improved over the last twenty years or so, but still many fundamental questions remain unsolved. I will try to review some of the puzzling aspects of the structure of the nucleon spin, in particular, what is known, what remains to be discovered and the prospects for the near future. I will also focus on some current activities in QCD spin physics.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 12:58:05 GMT" } ]
2007-12-18T00:00:00
[ [ "Soffer", "Jacques", "" ] ]
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712.2711
Boris Kerner
B. S. Kerner, S. L. Klenov, A. Brakemeier
Testbed for Wireless Vehicle Communication: a Simulation Approach based on Three-Phase Traffic Theory
null
null
null
null
physics.soc-ph
null
A testbed for wireless vehicle communication based on a microscopic model in the framework of three-phase traffic theory is presented. In this testbed, vehicle motion in traffic flow and analyses of a vehicle communication channel access based on IEEE 802.11e mechanisms, radio propagation modeling, message reception characteristics as well as all other effects associated with ad-hoc networks are integrated into a three-phase traffic flow model. Based on simulations of this testbed, some statistical features of ad-hoc vehicle networks as well as the effect of C2C communication on increase in the efficiency and safety of traffic are studied.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 13:22:10 GMT" } ]
2007-12-18T00:00:00
[ [ "Kerner", "B. S.", "" ], [ "Klenov", "S. L.", "" ], [ "Brakemeier", "A.", "" ] ]
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712.2712
Johannes Kestler
Ido Kanter and Evi Kopelowitz and Johannes Kestler and Wolfgang Kinzel
Chaos Synchronization with Dynamic Filters: Two Way is Better Than One Way
null
null
10.1209/0295-5075/83/50005
null
nlin.CD
null
Two chaotic systems which interact by mutually exchanging a signal built from their delayed internal variables, can synchronize. A third unit may be able to record and to manipulate the exchanged signal. Can the third unit synchronize to the common chaotic trajectory, as well? If all parameters of the system are public, a proof is given that the recording system can synchronize as well. However, if the two interacting systems use private commutative filters to generate the exchanged signal, a driven system cannot synchronize. It is shown that with dynamic private filters the chaotic trajectory even cannot be calculated. Hence two way (interaction) is more than one way (drive). The implication of this general result to secret communication with chaos synchronization is discussed.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 13:08:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Kanter", "Ido", "" ], [ "Kopelowitz", "Evi", "" ], [ "Kestler", "Johannes", "" ], [ "Kinzel", "Wolfgang", "" ] ]
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712.2713
Ricardo D\'iez Mui\~no
W. Schattke, E.E. Krasovskii, R. D\'iez Mui\~no, and P. M. Echenique
Direct resolution of unoccupied states in solids via two photon photoemission
12 pages, including 4 figures
null
10.1103/PhysRevB.78.155314
null
cond-mat.other
null
Non-linear effects in photoemission are shown to open a new access to the band structure of unoccupied states in solids, totally different from hitherto used photoemission spectroscopy. Despite its second-order nature, strong resonant transitions occur, obeying exact selection rules of energy, crystal symmetry, and momentum. Ab-initio calculations are used to demonstrate that such structures are present in low-energy laser spectroscopy experimental measurements on Si previously published. Similar resonances are expected in ultraviolet angle-resolved photoemission spectra, as shown in a model calculation on Al.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 13:10:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Schattke", "W.", "" ], [ "Krasovskii", "E. E.", "" ], [ "Muiño", "R. Díez", "" ], [ "Echenique", "P. M.", "" ] ]
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712.2714
Romuald A. Janik
Romuald A. Janik, Maciej Trzetrzelewski
Supergravitons from one loop perturbative N=4 SYM
22 pages; v2: references added
Phys.Rev.D77:085024,2008
10.1103/PhysRevD.77.085024
null
hep-th
null
We determine the partition function of 1/16 BPS operators in N=4 SYM at weak coupling at the one-loop level in the planar limit. This partition function is significantly different from the one computed at zero coupling. We find that it coincides precisely with the partition function of a gas of 1/16 BPS `supergravitons' in AdS_5xS^5.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 19:39:37 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 12:12:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Janik", "Romuald A.", "" ], [ "Trzetrzelewski", "Maciej", "" ] ]
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712.2715
Sophie Maurogordato
S.Maurogordato, A. Cappi, C. Ferrari, C. Benoist, G. Mars, G. Soucail, M. Arnaud, G.W. Pratt, H. Bourdin, J.-L. Sauvageot
A2163: Merger events in the hottest Abell galaxy cluster I. Dynamical analysis from optical data
23 pages, 22 figures, accepted for publication in Astronomy and Astrophysics
null
10.1051/0004-6361:20077614
null
astro-ph
null
We present a detailed optical analysis of the galaxy cluster A2163 based on new multicolor wide field imaging and medium-to-high resolution (R~2000) spectroscopy. While X-ray observations have revealed that merging processes are present in this cluster, the merging scenario is complex and not well-defined. We undertook a complementary optical analysis, aiming to understand the dynamics of the system, to add constraints to the merging scenario and to test its effect on the properties of galaxies. We provide a spectroscopic catalog of 512 new objects, where 361 galaxies are identified as cluster members. We derived estimates of the mean redshift and velocity dispersion: z= 0.2005 +/- 0.0003 and 1434 +/- 60 km/s, and performed a detailed dynamical analysis of unprecedented accuracy. We detected multiple evidences of merging events: i) strong subclustering in the galaxy density distribution, showing a main central component A2163-A, a northern one A2163-B, visible both in optical and in X-ray, and other substructures detected in optical, ii) bimodality in the density distribution for A2163-A, strong segregation between gaz and galaxies, and between galaxies of different luminosities, iii) low-density structures oriented along specific axes: mainly the EW direction, and the NS one, embedding the main substructures, iv) bimodality in the velocity distribution and a velocity gradient (~1250 km/s) along the NE/SW axis of the cluster. A2163 is exceptionally massive, with Mvir = 3.8 +/- 0.4 10**15 Msol/h70. Our analysis supports a scenario in which A2163-A has undergone a recent (t ~ 0.5 Gyr) merger along a a NE/SW (or E--W) axis, and A2163-B is connected to the main complex, probably infalling on A2163-A. (abridged)
[ { "version": "v1", "created": "Mon, 17 Dec 2007 13:21:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Maurogordato", "S.", "" ], [ "Cappi", "A.", "" ], [ "Ferrari", "C.", "" ], [ "Benoist", "C.", "" ], [ "Mars", "G.", "" ], [ "Soucail", "G.", "" ], [ "Arnaud", "M.", "" ], [ "Pratt", "G. W.", "" ], [ "Bourdin", "H.", "" ], [ "Sauvageot", "J. -L.", "" ] ]
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712.2716
Santo Fortunato Dr
Santo Fortunato, Claudio Castellano
Community Structure in Graphs
42 pages, 13 figures. Chapter of Springer's Encyclopedia of Complexity and System Science
null
null
null
physics.soc-ph cond-mat.stat-mech physics.comp-ph
null
Graph vertices are often organized into groups that seem to live fairly independently of the rest of the graph, with which they share but a few edges, whereas the relationships between group members are stronger, as shown by the large number of mutual connections. Such groups of vertices, or communities, can be considered as independent compartments of a graph. Detecting communities is of great importance in sociology, biology and computer science, disciplines where systems are often represented as graphs. The task is very hard, though, both conceptually, due to the ambiguity in the definition of community and in the discrimination of different partitions and practically, because algorithms must find ``good'' partitions among an exponentially large number of them. Other complications are represented by the possible occurrence of hierarchies, i.e. communities which are nested inside larger communities, and by the existence of overlaps between communities, due to the presence of nodes belonging to more groups. All these aspects are dealt with in some detail and many methods are described, from traditional approaches used in computer science and sociology to recent techniques developed mostly within statistical physics.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 13:15:56 GMT" } ]
2007-12-20T00:00:00
[ [ "Fortunato", "Santo", "" ], [ "Castellano", "Claudio", "" ] ]
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712.2717
Pantelis Manousselis
A. Chatzistavrakidis, P. Manousselis, N. Prezas, G. Zoupanos
Coset Space Dimensional Reduction of Einstein--Yang--Mills theory
15 pages, Contribution to the workshop "Challenges Beyond the Standard Model", September 2-9, 2007, Kladovo, Serbia. To appear in Fortsch.Phys
Fortsch.Phys.56:389-399,2008
10.1002/prop.200710510
null
hep-th
null
In the present contribution we extend our previous work by considering the coset space dimensional reduction of higher-dimensional Einstein--Yang--Mills theories including scalar fluctuations as well as Kaluza--Klein excitations of the compactification metric and we describe the gravity-modified rules for the reduction of non-abelian gauge theories.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 13:30:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Chatzistavrakidis", "A.", "" ], [ "Manousselis", "P.", "" ], [ "Prezas", "N.", "" ], [ "Zoupanos", "G.", "" ] ]
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712.2718
Daniel R. Tovey
M. M. Nojiri, G. Polesello, D. R. Tovey
A hybrid method for determining particle masses at the Large Hadron Collider with fully identified cascade decays
10 pages, 2 .eps figures, JHEP3 style
JHEP 0805:014,2008
10.1088/1126-6708/2008/05/014
KEK-TH-1207, PMU-07-0008
hep-ph
null
A new technique for improving the precision of measurements of SUSY particle masses at the LHC is introduced. The technique involves kinematic fitting of events with two fully identified decay chains. We incorporate both event ETmiss constraints and independent constraints provided by kinematic end-points in experiment invariant mass distributions of SUSY decay products. Incorporation of the event specific information maximises the information used in the fit and is shown to reduce the mass measurement uncertainites by ~30% compared to conventional fitting of experiment end-point constraints for the SPS1a benchmark model.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 13:25:55 GMT" }, { "version": "v2", "created": "Thu, 1 May 2008 14:54:59 GMT" } ]
2009-02-18T00:00:00
[ [ "Nojiri", "M. M.", "" ], [ "Polesello", "G.", "" ], [ "Tovey", "D. R.", "" ] ]
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712.2719
Kate Marvel
Kate Marvel and Neil Turok
Horizons and Tunneling in the Euclidean False Vacuum
8 pages, 5 figures
null
null
null
hep-th
null
In the thin-wall approximation, the decay of a gravitating false vacuum to a lower-energy state is affected by the cosmological horizon structure in both spaces. The nucleation radius of a bubble of true vacuum depends on the surface tension of its boundary and equals the false vacuum cosmological horizon at a critical tension. We argue that there is no tunneling instanton solution beyond the critical tension and argue that there is therefore a bound on allowed membrane tension in theories which rely on semiclassical tunneling to relax the cosmological constant.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 13:31:30 GMT" } ]
2007-12-18T00:00:00
[ [ "Marvel", "Kate", "" ], [ "Turok", "Neil", "" ] ]
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712.272
Frank Haberl
F. Haberl (MPE), W. Pietsch (MPE)
X-ray source populations in the Magellanic Clouds
6 pages, 3 figures, Fig. 2 in low resolution, to be published in the proceedings of the ESAC workshop "X-rays from Nearby Galaxies"
null
null
null
astro-ph
null
Early X-ray surveys of the Magellanic Clouds (MCs) were performed with the imaging instruments of the Einstein, ASCA and ROSAT satellites revealing discrete X-ray sources and large-scale diffuse emission. Large samples of supernova remnants, high and low mass X-ray binaries and super-soft X-ray sources could be studied in detail. Today, the major X-ray observatories XMM-Newton and Chandra with their advanced angular and spectral resolution and extended energy coverage are ideally suited for detailed population studies of the X-ray sources in these galaxies and to draw conclusions on our own Galaxy. We summarize our knowledge about the X-ray source populations in the MCs from past missions and present first results from systematic studies of the Small Magellanic Cloud (SMC) using the growing number of archival XMM-Newton observations.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 13:59:14 GMT" } ]
2007-12-18T00:00:00
[ [ "Haberl", "F.", "", "MPE" ], [ "Pietsch", "W.", "", "MPE" ] ]
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712.2721
Vytautas Paskunas
Matthew Emerton, Vytautas Paskunas
On effaceability of certain $\delta$-functors
In the previous version we worked over a field and with a fixed central character. In this version we allow the coefficients to be artinian rings and do not fix a central character. The paper has been completely rewritten, but the main idea remained the same
null
null
null
math.RT math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove a conjecture of the first author for $GL_2(F)$, where $F$ is a finite extension of $Q_p$.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:02:22 GMT" }, { "version": "v2", "created": "Wed, 20 Jan 2010 17:33:21 GMT" } ]
2010-01-20T00:00:00
[ [ "Emerton", "Matthew", "" ], [ "Paskunas", "Vytautas", "" ] ]
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712.2722
Paresh Paluskar
P. V. Paluskar, J. J. Attema, G. A. de Wijs, S. Fiddy, E. Snoeck, J. T. Kohlhepp, H. J. M. Swagten, R. A. de Groot, and B. Koopmans
Spin tunneling in junctions with disordered ferromagnets
To be published in Physical Review Letters. 5 double-column pages with 3 figures
null
10.1103/PhysRevLett.100.057205
null
cond-mat.mtrl-sci
null
We provide compelling evidence to establish that, contrary to one's elementary guess, the tunneling spin polarization (TSP) of amorphous CoFeB is larger than that of highly textured fcc CoFeB. First principles atomic and electronic structure calculations reveal striking agreement between the measured TSP and the predicted s-electron spin polarization. Given the disordered structure of the ternary alloy, not only do these results strongly endorse our communal understanding of tunneling through AlOx, but they also portray the key concepts that demand primary consideration in such complex systems.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:19:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Paluskar", "P. V.", "" ], [ "Attema", "J. J.", "" ], [ "de Wijs", "G. A.", "" ], [ "Fiddy", "S.", "" ], [ "Snoeck", "E.", "" ], [ "Kohlhepp", "J. T.", "" ], [ "Swagten", "H. J. M.", "" ], [ "de Groot", "R. A.", "" ], [ "Koopmans", "B.", "" ] ]
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712.2723
Margarita Iudin
M. Iudin
Study Of The Fundamental Physical Principles in Atmospheric Modeling Based On Identification Of Atmosphere - Climate Control Factors: Bromine Explosion At The Polar Arctic Sunrise
27 pages,5 figures; updated context
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We attempt is to provide accumulated evidence and qualitative understanding of the associated atmospheric phenomena of the Arctic bromine explosion and their role in the functioning of the biotic Earth. We rationalize the empirical expression of the bromine influx into atmospheric boundary layer and calculate total amounts of the tropospheric BrO and Bry of the Arctic origin. Based on the quantities and partitioning of the reactive bromine species, we estimate the biogeochemical parametric constraint on the surface ozone field of the springtime NH. The constraint expresses strong relationship between atmosphere-climate control factors of the Earth's life and of external energy source. Physical atmosphere can be seen as a complex network of maximum complexity. Henceforth, we analyze the network context of the Arctic bromine pollution. We suggest that demonstrated attitudinal approach to the distributed surface flux would be successfully used in the innovative atmospheric modeling. The analysis is illustrated by GEM model results which stay in a good agreement with the observational data and support the original idea of the global NH effect of bromine chemistry.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:30:41 GMT" }, { "version": "v2", "created": "Tue, 24 Nov 2009 17:22:24 GMT" }, { "version": "v3", "created": "Fri, 9 Jul 2010 19:24:59 GMT" } ]
2010-07-29T00:00:00
[ [ "Iudin", "M.", "" ] ]
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712.2724
Igor Chilingarian
Igor V. Chilingarian, Gary A. Mamon
SDSSJ124155.33+114003.7 -- a Missing Link Between Compact Elliptical and Ultracompact Dwarf Galaxies
5 pages, 4 figures, accepted to MNRAS Letters
MNRAS 385, L83-L87 (2008)
10.1111/j.1745-3933.2008.00438.x
null
astro-ph
null
We report the discovery of a compact object (R_e = 32 pc, M_B = -12.34 mag) at a projected distance of 9 kpc from Messier 59, a giant elliptical in the Virgo cluster. Using HST imaging and SDSS spectroscopy, both available in the Virtual Observatory, we find that this object has a blue core containing one-quarter of the light, and a redder n=1 Sersic envelope, as well as luminosity-weighted age of 9.3 +/- 1.4 Gyr, a metallicity of -0.03 +/- 0.04 dex and a velocity dispersion of 48 +/- 5 km/s. While ultra-compact dwarfs (UCDs) in the face-on view of the Fundamental Plane are found to form a sequence connecting the highest-luminosity globular clusters with the lowest-luminosity dwarf ellipticals, the compact object near M59 lies in between this UCD sequence and the positions of compact ellipticals. Its stellar age, metallicity, and effective surface brightness are similar to low-luminosity ellipticals and lenticulars, suggesting that SDSSJ124155.33+114003.7 is a result of the tidal stripping of such an object.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:41:31 GMT" } ]
2010-02-11T00:00:00
[ [ "Chilingarian", "Igor V.", "" ], [ "Mamon", "Gary A.", "" ] ]
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712.2725
Krzysztof Kowalski
K. Kowalski, J. Rembielinski and K.A. Smolinski
Lorentz covariant statistical mechanics and thermodynamics of the relativistic ideal gas and preferred frame
7 figures
Phys.Rev.D76:045018,2007
10.1103/PhysRevD.76.045018
null
hep-th astro-ph cond-mat.stat-mech
null
The Lorentz covariant classical and quantum statistical mechanics and thermodynamics of an ideal relativistic gas of bradyons (particles slower than light), luxons (particles moving with the speed of light) and tachyons (hypothetical particles faster than light) is discussed. The Lorentz covariant formulation is based on the preferred frame approach which among others enables consistent, free of paradoxes description of tachyons. The thermodynamic functions within the covariant approach are obtained both in classical and quantum case.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:33:45 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 08:42:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Kowalski", "K.", "" ], [ "Rembielinski", "J.", "" ], [ "Smolinski", "K. A.", "" ] ]
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712.2726
Cl\'ementine Prieur
J. Dedecker and C. Prieur
Some unbounded functions of intermittent maps for which the central limit theorem holds
16 pages
null
null
null
math.PR math.DS
null
We compute some dependence coefficients for the stationary Markov chain whose transition kernel is the Perron-Frobenius operator of an expanding map $T$ of $[0, 1]$ with a neutral fixed point. We use these coefficients to prove a central limit theorem for the partial sums of $f\circ T^i$, when $f$ belongs to a large class of unbounded functions from $[0, 1]$ to ${\mathbb R}$. We also prove other limit theorems and moment inequalities.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:38:17 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 16:26:45 GMT" }, { "version": "v3", "created": "Mon, 11 Feb 2008 13:27:56 GMT" } ]
2008-02-11T00:00:00
[ [ "Dedecker", "J.", "" ], [ "Prieur", "C.", "" ] ]
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712.2727
Yuri Kornyushin
Yuri Kornyushin
Oxygen molecular plasma at ambient temperature and elevated or high pressure
Full ionization of oxygen molecular gas is discussed
null
null
null
physics.plasm-ph physics.chem-ph
null
Usually microscopic electrostatic field around ions is neglected when the ionization energy is concerned. The ionization energy is considered to be equal to that of a separate atom (molecule). Here the energy of the electrostatic field around ions is taken into account. It is shown that the energy of this field contributes to decrease in the effective ionization energy. The effective ionization energy may turn to zero at some critical concentration of delocalized electrons. This leads to a complete ionization of the atoms (molecules). Concrete calculations were performed for oxygen molecular gas.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:38:49 GMT" } ]
2007-12-18T00:00:00
[ [ "Kornyushin", "Yuri", "" ] ]
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712.2728
Krzysztof Kowalski
K. Kowalski, J. Rembielinski and K.A. Smolinski
Relativistic ideal Fermi gas at zero temperature and preferred frame
null
Phys.Rev.D76:127701,2007
10.1103/PhysRevD.76.127701
null
hep-th astro-ph cond-mat.stat-mech
null
We discuss the limit T->0 of the relativistic ideal Fermi gas of luxons (particles moving with the speed of light) and tachyons (hypothetical particles faster than light) based on observations of our recent paper: K. Kowalski, J. Rembielinski and K.A. Smolinski, Phys. Rev. D, 76, 045018 (2007). For bradyons this limit is in fact the nonrelativistic one and therefore it is not studied herein.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:43:21 GMT" } ]
2008-11-26T00:00:00
[ [ "Kowalski", "K.", "" ], [ "Rembielinski", "J.", "" ], [ "Smolinski", "K. A.", "" ] ]
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712.2729
William Percival
Will J. Percival, Bjoern M. Schaefer
Galaxy peculiar velocities and evolution-bias
5 pages, 4 figures, MNRAS accepted
null
10.1111/j.1745-3933.2008.00437.x
null
astro-ph
null
Galaxy bias can be split into two components: a formation-bias based on the locations of galaxy creation, and an evolution-bias that details their subsequent evolution. In this letter we consider evolution-bias in the peaks model. In this model, galaxy formation takes place at local maxima in the density field, and we analyse the subsequent peculiar motion of these galaxies in a linear model of structure formation. The peak restriction yields differences in the velocity distribution and correlation between the galaxy and the dark matter fields, which causes the evolution-bias component of the total bias to evolve in a scale-dependent way. This mechanism naturally gives rise to a change in shape between galaxy and matter correlation functions that depends on the mean age of the galaxy population. This model predicts that older galaxies would be more strongly biased on large scales compared to younger galaxies. Our arguments are supported by a Monte-Carlo simulation of galaxy pairs propagated using the Zel'dovich-approximation for describing linear peculiar galaxy motion.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:00:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Percival", "Will J.", "" ], [ "Schaefer", "Bjoern M.", "" ] ]
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712.273
Ors Legeza
Eugene H. Kim, \"O. Legeza, and J. S\'olyom
Topological Order, Dimerization, and Spinon Deconfinement in Frustrated Spin Ladders
18 pages, 21 figures
null
10.1103/PhysRevB.77.205121
null
cond-mat.str-el
null
We consider topological order and dimer order in several frustrated spin ladder models, which are related to higher dimensional models of current interest; we also address the occurrence of fractionalized phases with deconfined spinon excitations in these models. Combining results obtained with both analytic and numerical methods, we discuss how the occurrence of dimerized or fractionalized phases are dictated by the system's geometry.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:49:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Kim", "Eugene H.", "" ], [ "Legeza", "Ö.", "" ], [ "Sólyom", "J.", "" ] ]
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712.2731
Francois Huveneers
Fran\c{c}ois Huveneers
Subdiffusive behavior generated by irrational rotations
17 pages, 0 figure
null
null
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The origin of deterministic diffusion is a matter of discussion. We study the asymptotic distributions of the sums $y_n(x)=\sum_{k=0}^{n-1}\psi (x+k\alpha)$, where $\psi$ is a periodic function of bounded variation and $\alpha$ an irrational number. It is known that no diffusion process will be observed. Nevertheless, we find a picewise constant function $\psi$ and an increasing sequence of integer $(n_j)_j$ such that the limit distribution of the sequence $(y_{n_j}/\sqrt j)_j$ is Gaussian (with stricly positive variance). If $\alpha$ is of constant type, we show that the sequence $(n_j)_j$ may be taken to grow exponentially (this is close to optimal in some sense, and one has $||y_{n_j}||_{\mathrm L^2}\sim \max_{0\le k\le n_j}||y_k||_{\mathrm L^2}$ as $j\to\infty$). We give an heuristic link with the theory of expanding maps of the interval.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:57:14 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 14:04:52 GMT" }, { "version": "v3", "created": "Thu, 14 Jul 2011 14:36:27 GMT" } ]
2011-07-15T00:00:00
[ [ "Huveneers", "François", "" ] ]
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712.2732
Louise Willingale
L. Willingale, S. P. D. Mangles, P. M Nilson, R. J. Clarke, A. E. Dangor, M. C. Kaluza, S. Karsch, K. L. Lancaster, W. B. Mori, J. Schreiber, A. G. R. Thomas, M. S. Wei, K. Krushelnick and Z. Najmudin
Longitudinal Ion Acceleration from High-Intensity Laser Interactions with Underdense Plasma
18 pages, 6 figures
null
10.1109/TPS.2008.927357
null
physics.plasm-ph
null
Longitudinal ion acceleration from high-intensity (I ~ 10^20 Wcm^-2) laser interactions with helium gas jet targets (n_e ~ 0.04 n_c) have been observed. The ion beam has a maximum energy for He^2+ of approximately 40 MeV and was directional along the laser propagation path, with the highest energy ions being collimated to a cone of less than 10 degrees. 2D particle-in-cell simulations have been used to investigate the acceleration mechanism. The time varying magnetic field associated with the fast electron current provides a contribution to the accelerating electric field as well as providing a collimating field for the ions. A strong correlation between the plasma density and the ion acceleration was found. A short plasma scale-length at the vacuum interface was observed to be beneficial for the maximum ion energies, but the collimation appears to be improved with longer scale-lengths due to enhanced magnetic fields in the ramp acceleration region.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:04:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Willingale", "L.", "" ], [ "Mangles", "S. P. D.", "" ], [ "Nilson", "P. M", "" ], [ "Clarke", "R. J.", "" ], [ "Dangor", "A. E.", "" ], [ "Kaluza", "M. C.", "" ], [ "Karsch", "S.", "" ], [ "Lancaster", "K. L.", "" ], [ "Mori", "W. B.", "" ], [ "Schreiber", "J.", "" ], [ "Thomas", "A. G. R.", "" ], [ "Wei", "M. S.", "" ], [ "Krushelnick", "K.", "" ], [ "Najmudin", "Z.", "" ] ]
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712.2733
Robert Kehoe
R. Kehoe, M. Narain, A. Kumar
Review of Top Quark Physics Results
119 pages, 55 figures
Int.J.Mod.Phys.A23:353-470,2008
10.1142/S0217751X08039293
SMU-HEP-07-31, FERMILAB-PUB-08/028-E
hep-ex
null
As the heaviest known fundamental particle, the top quark has taken a central role in the study of fundamental interactions. Production of top quarks in pairs provides an important probe of strong interactions. The top quark mass is a key fundamental parameter which places a valuable constraint on the Higgs boson mass and electroweak symmetry breaking. Observations of the relative rates and kinematics of top quark final states constrain potential new physics. In many cases, the tests available with study of the top quark are both critical and unique. Large increases in data samples from the Fermilab Tevatron have been coupled with major improvements in experimental techniques to produce many new precision measurements of the top quark. The first direct evidence for electroweak production of top quarks has been obtained, with a resulting direct determination of $V_{tb}$. Several of the properties of the top quark have been measured. Progress has also been made in obtaining improved limits on potential anomalous production and decay mechanisms. This review presents an overview of recent theoretical and experimental developments in this field. We also provide a brief discussion of the implications for further efforts.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 16:47:37 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 22:26:55 GMT" }, { "version": "v3", "created": "Tue, 1 Apr 2008 13:49:38 GMT" } ]
2008-11-26T00:00:00
[ [ "Kehoe", "R.", "" ], [ "Narain", "M.", "" ], [ "Kumar", "A.", "" ] ]
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712.2734
Jose Gracia
J. Gracia, S. Bogovalov, K. Tsinganos
MHD models and synthetic synchrotron maps for the jet of M87
4 pages, 5 figures, to appear in the proceedings of the HEPRO conference, September 24-28, 2007, Dublin, Ireland
null
10.1142/S0218271808013303
null
astro-ph
null
We present a self-consistent MHD model for the jet of M87. The model consist of two distinct zones: an inner relativistic outflow, which we identify with the observed jet, and an outer cold disk-wind. While the former does not self-collimate efficiently due to its high effective inertia, the latter fulfills all the conditions for efficient collimation by the magneto-centrifugal mechanism. Given the right balance between the effective inertia of the inner flow and the collimation efficiency of the outer disk wind, the relativistic flow is magnetically confined into a well collimated beam for a wide range of parameters and matches the measurements of the opening angle of M87 over several orders of magnitude in spatial extent. In the second part of this work, we present synthetic synchrotron emission maps for our MHD models. In principle the two-zone model can reproduce the morphological structure seen in radio observations, as central-peaked profiles across the jet close the the source, limb-bright further down the jet, and a bright knot close to the position of HST-1. However it is difficult to reconcile all features into a single set of parameters.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:12:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Gracia", "J.", "" ], [ "Bogovalov", "S.", "" ], [ "Tsinganos", "K.", "" ] ]
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712.2735
Anand Jha
Anand Kumar Jha, Malcolm N. O'Sullivan, Kam Wai Clifford Chan, and Robert W. Boyd
Temporal Coherence and Indistinguishability in Two-Photon Interference Effects
4 pages, 3 figures, typos corrected, FIG. 2 slightly edited
Phys. Rev. A 77, 021801(R) (2008)
10.1103/PhysRevA.77.021801
null
quant-ph
null
We show that temporal two-photon interference effects involving the signal and idler photons created by parametric down-conversion can be fully characterized in terms of the variations of two length parameters--called the biphoton path-length difference and the biphoton path-asymmetry- length difference--which we construct using the six different length parameters that a general two-photon interference experiment involves. We perform an experiment in which the effects of the variations of these two parameters can be independently controlled and studied. In our experimental setup, which does not involve mixing of signal and idler photons at a beam splitter, we further report observations of Hong-Ou-Mandel- (HOM-)like effects both in coincidence and in one-photon count rates. As an important consequence, we argue that the HOM and the HOM-like effects are best described as observations of how two-photon coherence changes as a function of the biphoton path- asymmetry-length difference.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:44:01 GMT" }, { "version": "v2", "created": "Mon, 11 Feb 2008 16:56:23 GMT" } ]
2008-02-11T00:00:00
[ [ "Jha", "Anand Kumar", "" ], [ "O'Sullivan", "Malcolm N.", "" ], [ "Chan", "Kam Wai Clifford", "" ], [ "Boyd", "Robert W.", "" ] ]
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712.2736
Tchavdar Palev
T.D. Palev
A Note on the Statistics of Hardcore Fermions
null
null
null
null
cond-mat.str-el hep-th math-ph math.MP quant-ph
null
It is shown that the statistics of the hardcore fermions is A-superstatistics of order one [see T.D.P. J. Math. Phys. 21, 1293 (1980)]. The Pauli principle for these particles is formulated. The Hubbard operators, which constitute a basis in the Lie superalgebra gl(1|n), are expressed via the creation and the annihilation operators of the hardcore fermions.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:09:59 GMT" } ]
2007-12-18T00:00:00
[ [ "Palev", "T. D.", "" ] ]
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712.2737
Wim Vanhoof
Kim Henriksen, Gourinath Banda, John Gallagher
Experiments with a Convex Polyhedral Analysis Tool for Logic Programs
Paper presented at the 17th Workshop on Logic-based Methods in Programming Environments (WLPE2007)
null
null
null
cs.PL cs.SE
null
Convex polyhedral abstractions of logic programs have been found very useful in deriving numeric relationships between program arguments in order to prove program properties and in other areas such as termination and complexity analysis. We present a tool for constructing polyhedral analyses of (constraint) logic programs. The aim of the tool is to make available, with a convenient interface, state-of-the-art techniques for polyhedral analysis such as delayed widening, narrowing, "widening up-to", and enhanced automatic selection of widening points. The tool is accessible on the web, permits user programs to be uploaded and analysed, and is integrated with related program transformations such as size abstractions and query-answer transformation. We then report some experiments using the tool, showing how it can be conveniently used to analyse transition systems arising from models of embedded systems, and an emulator for a PIC microcontroller which is used for example in wearable computing systems. We discuss issues including scalability, tradeoffs of precision and computation time, and other program transformations that can enhance the results of analysis.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:11:36 GMT" } ]
2007-12-18T00:00:00
[ [ "Henriksen", "Kim", "" ], [ "Banda", "Gourinath", "" ], [ "Gallagher", "John", "" ] ]
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712.2738
Steven Delvaux
Ruyman Cruz Barroso, Steven Delvaux
Orthogonal Laurent polynomials on the unit circle and snake-shaped matrix factorizations
30 pages, 5 figures
J. Approx. Theory 161 (2009), 65-87
null
null
math.CA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let there be given a probability measure $\mu$ on the unit circle $\TT$ of the complex plane and consider the inner product induced by $\mu$. In this paper we consider the problem of orthogonalizing a sequence of monomials $\{z^{r_k}\}_k$, for a certain order of the $r_k\in\mathbb{Z}$, by means of the Gram-Schmidt orthogonalization process. This leads to a basis of orthonormal Laurent polynomials $\{\psi_k\}_k$. We show that the matrix representation with respect to the basis $\{\psi_k\}_k$ of the operator of multiplication by $z$ is an infinite unitary or isometric matrix allowing a 'snake-shaped' matrix factorization. Here the 'snake shape' of the factorization is to be understood in terms of its graphical representation via sequences of little line segments, following an earlier work of Delvaux and Van Barel. We show that the shape of the snake is determined by the order in which the monomials $\{z^{r_k}\}_k$ are orthogonalized, while the 'segments' of the snake are canonically determined in terms of the Schur parameters for $\mu$. Isometric Hessenberg matrices and unitary five-diagonal matrices (CMV matrices) follow as a special case of the presented formalism.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:12:29 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2012 15:50:10 GMT" } ]
2012-12-07T00:00:00
[ [ "Barroso", "Ruyman Cruz", "" ], [ "Delvaux", "Steven", "" ] ]
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712.2739
Ashley Willis
Ashley P. Willis and Rich R. Kerswell
Turbulent dynamics of pipe flow captured in a reduced model: puff relaminarisation and localised `edge' states
21 pages, 9 figures; as accepted, J. Fluid Mech
null
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fully 3-dimensional computations of flow through a long pipe demand a huge number of degrees of freedom, making it very expensive to explore parameter space and difficult to isolate the structure of the underlying dynamics. We therefore introduce a `2+epsilon' dimensional model of pipe flow which is a minimal 3-dimensionalisation of the axisymmetric case: only sinusoidal variation in azimuth plus azimuthal shifts are retained, yet the same dynamics familiar from experiments are found. In particular the model retains the subcritical dynamics of fully resolved pipe flow, capturing realistic localised `puff'-like structures which can decay abruptly after long times, as well as global `slug' turbulence. Relaminarisation statistics of puffs reproduce the memoryless feature of pipe flow and indicate the existence of a Reynolds number about which lifetimes diverge rapidly, provided that the pipe is sufficiently long. Exponential divergence of the lifetime is prevalent in shorter periodic domains. In a short pipe, exact travelling-wave solutions are found nearby to flow trajectories on the boundary between laminar and turbulent flow. In a long pipe, the attracting state on the laminar-turbulent boundary is a localised structure which resembles a smoothened puff. This `edge' state remains localised even for Reynolds numbers where the turbulent state is global.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:16:57 GMT" }, { "version": "v2", "created": "Mon, 13 Oct 2008 12:48:11 GMT" } ]
2008-10-13T00:00:00
[ [ "Willis", "Ashley P.", "" ], [ "Kerswell", "Rich R.", "" ] ]
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712.274
Pengbo Li
Pengbo Li
Effective generation of entangled states and realization of quantum gate operations in cavity QED
This paper has been withdrawn
null
null
null
quant-ph
null
This paper has been withdrawn by the author due to some problems.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:18:04 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 08:48:55 GMT" } ]
2008-04-01T00:00:00
[ [ "Li", "Pengbo", "" ] ]
[ 0.0851035267, 0.0361612998, -0.0398056582, 0.1110760123, -0.0816131532, 0.0116773536, -0.0568212308, 0.0256260168, -0.0479926392, -0.0384711064, 0.1242162436, -0.0654958338, -0.0683189332, 0.0795086622, 0.0944967344, -0.0409862287, -0.0458881482, 0.0181448106, 0.0123767117, 0.1419760883, -0.0541007929, -0.0811511874, 0.024727758, 0.0209679063, -0.1200072616, -0.0344417766, 0.1564508677, 0.0336975046, 0.0447075814, -0.0035096221, 0.0368285775, -0.0635453314, -0.014051321, -0.138793692, -0.0817158073, 0.183552593, -0.0354683585, 0.0170412362, -0.1293491423, 0.0050238282, -0.0212758817, -0.0899797827, -0.0526122525, 0.0512776971, 0.0490705483, 0.0571292043, -0.014846921, -0.0306434277, 0.0654445067, -0.0728872195, 0.0407039188, -0.0397286676, 0.0401649624, -0.0459651425, -0.0763262585, -0.0732978508, -0.0295398552, -0.0428084061, -0.0524582639, 0.0223152936, 0.0452465378, -0.0226617642, 0.0019681472, 0.026691094, -0.0961905941, -0.0591310374, 0.0104518728, 0.0319266543, 0.0597469844, 0.0874646604, -0.0980384424, 0.0870027021, 0.0149367461, 0.0756589845, 0.0533821881, 0.0381887965, -0.0066663572, 0.005594864, -0.0398313254, 0.0359559841, 0.0385224335, -0.0558973104, 0.0516113341, -0.0563592687, -0.0858221278, -0.0659577996, -0.0459138118, -0.0154243726, -0.0201723073, -0.0908523723, 0.0351090543, 0.0167332627, -0.0399596468, -0.0507387407, 0.0686269104, 0.0199028291, 0.0950100273, 0.0201594755, 0.0621081218, -0.0152575532, -0.0364436097, -0.0777121484, -0.0099321669, -0.0837689713, 0.1069696918, -0.0203134622, -0.1543977112, 0.072219938, -0.0649825484, 0.004895506, -0.0177983399, -0.0906470567, -0.0115105342, -0.0862327665, -0.0511750393, -0.1356112808, 0.0606709085, -0.034287788, 0.0331328847, 0.1179540977, -0.0671383664, 0.0114014596, 0.004497706, -0.0934188291, 0.0608762242, 0.0153730428, 0.0538441464, -0.1578880847, -0.0275123585, 0.0615948327, 0.1052245051, 0.0613381863, 0.0795599893, 0.0359303169, -0.0572318621, -0.0664197579, -0.0109330826, 0.0615435019, -0.0080201607, -0.0295655187, 0.0636479929, -0.0510210507, 0.0466580838, 0.0665224195, 0.0244454481, 0.0889532045, -0.0756589845, -0.0459908061, 0.0761722773, 0.0019873958, -0.0401392989, -0.10163147, 0.0073015541, -0.0408322401, 0.0337488353, -0.0896204785, -0.0458368212, 0.0613895133, -0.0254078675, -0.0112025598, 0.0612355284, 0.0507130772, -0.0908523723, -0.0228542481, 0.0883372501, 0.0292062163, -0.0830503628, 0.0232520495, -0.0456315055, -0.0848982111, 0.0468120724, -0.1242162436, -0.0259083249, 0.0562566109, -0.0082768053, 0.014846921, -0.0615435019, -0.0708853826, -0.1027093828, -0.1161062568, 0.0418844856, 0.0314646922, -0.0199798234, -0.0017467909, -0.0663684309, 0.0039330865, 0.0826910585, 0.004847385, -0.0260751452, 0.0463757738, -0.1224710569, 0.007494038, 0.0211090613, 0.0174903646, 0.0050944057, -0.038958732, 0.0619028062, 0.0388817377, 0.0077699311, -0.1679485738, -0.0260623135, -0.0874646604, 0.0844875798, 0.0039042141, -0.0131658949, -0.0643666014, 0.0624674261, -0.0451182127, -0.0063423426, -0.0289752353, 0.0665224195, 0.0432703681, 0.0392153747, -0.0194537006, 0.0510210507, 0.0013914978, 0.0122676371, 0.0346214287, -0.0458368212, 0.1026580483, -0.1116919592, 0.0171182305, -0.0093354667, 0.1098441184, 0.0130375726, 0.0259724874, -0.0760696158, -0.0975251496, 0.0258954931, -0.0515086763, -0.0777121484, 0.0625187531, -0.0003797546, 0.0219046623, -0.0367259197, 0.0930081978, 0.0801759362, -0.0404216088, -0.0211603902, -0.0552813597, 0.0498918146, 0.0107598472, -0.0516883284, -0.0321063064, -0.0491732061, 0.0446562506, -0.0414995179, -0.0116003603, 0.031233713, -0.0583097748, -0.0271530543, 0.1110760123, 0.0194665324, 0.0322859585, 0.0127745112, 0.0452978648 ]
712.2741
Tommaso Roscilde
Tommaso Roscilde
Bosons in one-dimensional incommensurate superlattices
22 pages, 28 figures
Phys. Rev. A 77, 063605 (2008)
10.1103/PhysRevA.77.063605
null
cond-mat.dis-nn cond-mat.str-el
null
We investigate numerically the zero-temperature physics of the one-dimensional Bose-Hubbard model in an incommensurate cosine potential, recently realized in experiments with cold bosons in optical superlattices L. Fallani et al., Phys. Rev. Lett. 98, 130404, (2007)]. An incommensurate cosine potential has intermediate properties between a truly periodic and a fully random potential, displaying a characteristic length scale (the quasi-period) which is shown to set a finite lower bound to the excitation energy of the system at special incommensurate fillings. This leads to the emergence of gapped incommensurate band-insulator (IBI) phases along with gapless Bose-glass (BG) phases for strong quasi-periodic potential, both for hardcore and softcore bosons. Enriching the spatial features of the potential by the addition of a second incommensurate component appears to remove the IBI regions, stabilizing a continuous BG phase over an extended parameter range. Moreover we discuss the validity of the local-density approximation in presence of a parabolic trap, clarifying the notion of a local BG phase in a trapped system; we investigate the behavior of first- and second-order coherence upon increasing the strength of the quasi-periodic potential; and we discuss the ab-initio derivation of the Bose-Hubbard Hamiltonian with quasi-periodic potential starting from the microscopic Hamiltonian of bosons in an incommensurate superlattice.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 20:24:52 GMT" } ]
2010-03-23T00:00:00
[ [ "Roscilde", "Tommaso", "" ] ]
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712.2742
Gelu Popescu
Gelu Popescu
Free pluriharmonic majorants and noncommutative interpolation
35 pages
null
null
null
math.FA math.OA
null
In this paper, we initiate the study of sub-pluriharmonic curves in Cuntz-Toeplitz algebras and free pluriharmonic majorants on noncommutative balls. We are lead to a characterization of the noncommutative Hardy space $H^2_{\bf ball}$ in terms of free pluriharmonic majorants, and to a Schur type description of the unit ball of $H^2_{\bf ball}$. These results are used to solve a multivariable commutant lifting problem and provide a description of all solutions.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:29:45 GMT" } ]
2007-12-18T00:00:00
[ [ "Popescu", "Gelu", "" ] ]
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712.2743
Matthias Staudacher
Lisa Freyhult, Adam Rej, Matthias Staudacher
A Generalized Scaling Function for AdS/CFT
27 pages, no figures; v2: references added and typos fixed
J.Stat.Mech.0807:P07015,2008
10.1088/1742-5468/2008/07/P07015
AEI-2007-173, UUITP-19/07, NI07091
hep-th
null
We study a refined large spin limit for twist operators in the sl(2) sector of AdS/CFT. We derive a novel non-perturbative equation for the generalized two-parameter scaling function associated to this limit, and analyze it at weak coupling. It is expected to smoothly interpolate between weakly coupled gauge theory and string theory at strong coupling.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:39:32 GMT" }, { "version": "v2", "created": "Wed, 23 Apr 2008 16:10:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Freyhult", "Lisa", "" ], [ "Rej", "Adam", "" ], [ "Staudacher", "Matthias", "" ] ]
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712.2744
Philip Yock
Philip Yock
Anomalous gamma gamma interaction
4 pages, 3 figures, talk given at Linear Collider Workshop LCWS/ILC 2007, DESY, May 2007
ECONF C0705302:GG03,2007
null
null
hep-ph
null
Data from LEP2 on hadron production in gamma gamma interactions at high pT exceed the predictions of QCD by about an order of magnitude. The amplitude for the process is asymptotically proportional to the sum of the squares of the charges of quarks. The data are suggestive of models where quarks have unit charges, or larger. Unequivocal tests could be made with the ILC or CLIC, but a plasma wakefield e-e- collider might provide the most affordable option.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 20:20:27 GMT" } ]
2009-02-16T00:00:00
[ [ "Yock", "Philip", "" ] ]
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712.2745
Oleg Kochukhov
O. Kochukhov, N. Piskunov
Magnetic Doppler Imaging of Active Stars
4 pages, 3 figures; to appear in the proceedings of Solar Polarization Workshop 5, ASP Conf. Ser
AIP Conf.Proc.1094:720-723,2009
10.1063/1.3099216
null
astro-ph
null
We present a new implementation of the magnetic Doppler imaging technique, which aims at self-consistent temperature and magnetic mapping of the surface structures in cool active stars. Our magnetic imaging procedure is unique in its capability to model individual spectral features in all four Stokes parameters. We discuss performance and intrinsic limitations of the new magnetic Doppler imaging method. A special emphasis is given to the simultaneous modelling of the magnetically sensitive lines in the optical and infrared regions and to combining information from both atomic and molecular spectral features. These two techniques may, for the first time, give us a tool to study magnetic fields in the starspot interiors.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:43:52 GMT" } ]
2009-06-23T00:00:00
[ [ "Kochukhov", "O.", "" ], [ "Piskunov", "N.", "" ] ]
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712.2746
Bindu Radhamany
R. Bindu, Kalobaran Maiti, R. Rawat and S. Khalid
Electronic and structural transition in $La_{0.2} Sr_{0.8} Mn O_3$
3 pages, 3 figures
null
10.1063/1.2898885
null
cond-mat.str-el cond-mat.mtrl-sci
null
We investigate the interplay of the electronic and structural transition in La$_{0.2}$Sr$_{0.8}$MnO$_{3}$. The transport and specific heat measurements exhibit unusual evolutions and signature of a first order phase transition around 265 K. Mn K-edge extended $x$-ray absorption fine structure results reveal distortion in the MnO$_6$ octahedra even in the cubic phase and a remarkable evolution of the distortion across the phase transition. These results manifest the importance of fluctuations in Mn 3$d$ orbital occupancy and disorder in their electronic properties, which may help in understanding the orbital and spin ordering proposed in these systems.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:47:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Bindu", "R.", "" ], [ "Maiti", "Kalobaran", "" ], [ "Rawat", "R.", "" ], [ "Khalid", "S.", "" ] ]
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712.2747
Andrei Pronko G
L. D. Faddeev
Discrete series of representations for the modular double of U_q(sl(2,R))
8 pages, no figures
null
null
null
math.QA hep-th
null
Modular double of quantum group U_q (sl(2)) with deformation parameter q=e^{i\pi\tau} is a natural object explicitly taking into account the duality \tau -> 1/\tau. The use of the modular double in CFT allows to consider the region 1<c<25 for the central charge of the Virasoro algebra when |\tau|=1. In this paper a new discrete series of representations for the modular double of U_q (sl(2,R)) is found for such \tau.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:48:59 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 01:06:15 GMT" }, { "version": "v3", "created": "Mon, 24 Mar 2008 23:14:59 GMT" }, { "version": "v4", "created": "Tue, 29 Apr 2008 12:23:18 GMT" } ]
2008-04-29T00:00:00
[ [ "Faddeev", "L. D.", "" ] ]
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712.2748
Bakhodir Abdullaev
B. Abdullaev, U. R\"ossler, and C.-H. Park
Analytic approach to the ground state energy of charged anyon gases in the high magnetic field
5 pages, 1 figure
null
null
null
cond-mat.str-el
null
We present analytic formulas for the ground state energy of the two-dimensional (2D) anyon gas in the quantum limit of a perpendicular magnetic field (Landau level filling factor \nu_L\le 1). These formulas, for the cases without and with Coulomb interaction, are obtained by applying the harmonic potential regularization for vanishing confinement to the harmonically confined Coulomb anyon gas as in our previous paper for the case without magnetic field. For the case without Coulomb interaction our analytic expression is exact. It contains a contribution deriving from the anyon gauge field (characterizing the fractional statistics by the anyon parameter \nu) and depends on \nu and \nu_L. For the case with Coulomb interaction we introduce a function, depending on \nu, \nu_L and the density parameter r_s, which is determined by fitting to the interpolation formula of Fano and Ortolani in the fractional quantum Hall regime for spin-polarized fermions in conjunction with results of Yoshioka for the ground state energy of the 2D Coulomb boson gas in high magnetic fields. With their dependence on \nu, our formulas apply not only to fermions (\nu=1) but quite generally to anyons (0\le \nu\le 1).
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:49:06 GMT" } ]
2007-12-18T00:00:00
[ [ "Abdullaev", "B.", "" ], [ "Rössler", "U.", "" ], [ "Park", "C. -H.", "" ] ]
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712.2749
Svante Janson
Persi Diaconis and Svante Janson
Graph limits and exchangeable random graphs
26 pages
null
null
null
math.PR math.CO
null
We develop a clear connection between deFinetti's theorem for exchangeable arrays (work of Aldous--Hoover--Kallenberg) and the emerging area of graph limits (work of Lovasz and many coauthors). Along the way, we translate the graph theory into more classical probability.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:53:12 GMT" } ]
2007-12-18T00:00:00
[ [ "Diaconis", "Persi", "" ], [ "Janson", "Svante", "" ] ]
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712.275
Florent Ravelet
Florent Ravelet (AHD, LEMFI), Rene Delfos (AHD), Jerry Westerweel (AHD)
Influence of global rotation and Reynolds number on the large-scale features of a turbulent Taylor-Couette flow
null
Physics of Fluids 22 (2010) 055103
10.1063/1.3392773
null
physics.flu-dyn physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We experimentally study the turbulent flow between two coaxial and independently rotating cylinders. We determined the scaling of the torque with Reynolds numbers at various angular velocity ratios (Rotation numbers), and the behaviour of the wall shear stress when varying the Rotation number at high Reynolds numbers. We compare the curves with PIV analysis of the mean flow and show the peculiar role of perfect counterrotation for the emergence of organised large scale structures in the mean part of this very turbulent flow that appear in a smooth and continuous way: the transition resembles a supercritical bifurcation of the secondary mean flow.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:56:40 GMT" }, { "version": "v2", "created": "Mon, 17 Mar 2008 07:57:57 GMT" }, { "version": "v3", "created": "Mon, 25 Jan 2010 10:50:35 GMT" } ]
2010-06-08T00:00:00
[ [ "Ravelet", "Florent", "", "AHD, LEMFI" ], [ "Delfos", "Rene", "", "AHD" ], [ "Westerweel", "Jerry", "", "AHD" ] ]
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712.2751
Fraser Lewis
Fraser Lewis, David M. Russell, Rob P. Fender, Paul Roche
Monitoring LMXBs with the Faulkes Telescopes
Conference proceedings from 'A Population Explosion: The Nature and Evolution of X-ray Binaries in Diverse Environments', 28 Oct - 2 Nov, St. Petersburg Beach, FL. 3 pages, 3 figures
AIP Conf.Proc.1010:204-206,2008
10.1063/1.2945042
null
astro-ph
null
We have been undertaking a monitoring project of 13 low-mass X-ray binaries (LMXBs) using FT North since early 2006. The introduction of FT South has allowed us to extend this monitoring to include 15 southern hemisphere LMXBs. With new instrumentation, we also intend to expand this monitoring to include both infrared wavelengths and spectroscopy.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:57:00 GMT" } ]
2009-06-23T00:00:00
[ [ "Lewis", "Fraser", "" ], [ "Russell", "David M.", "" ], [ "Fender", "Rob P.", "" ], [ "Roche", "Paul", "" ] ]
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712.2752
Frank Schweitzer
Michael D. Koenig, Stefano Battiston, Mauro Napoletano, Frank Schweitzer
On Algebraic Graph Theory and the Dynamics of Innovation Networks
Networks and Heterogeneous Media (2007, submitted)
Networks and Heterogeneous Media, vol. 3, no. 2 (2008), pp. 201-219
null
null
physics.soc-ph
null
We investigate some of the properties and extensions of a dynamic innovation network model recently introduced in \citep{koenig07:_effic_stabil_dynam_innov_networ}. In the model, the set of efficient graphs ranges, depending on the cost for maintaining a link, from the complete graph to the (quasi-) star, varying within a well defined class of graphs. However, the interplay between dynamics on the nodes and topology of the network leads to equilibrium networks which are typically not efficient and are characterized, as observed in empirical studies of R&D networks, by sparseness, presence of clusters and heterogeneity of degree. In this paper, we analyze the relation between the growth rate of the knowledge stock of the agents from R&D collaborations and the properties of the adjacency matrix associated with the network of collaborations. By means of computer simulations we further investigate how the equilibrium network is affected by increasing the evaluation time $\tau$ over which agents evaluate whether to maintain a link or not. We show that only if $\tau$ is long enough, efficient networks can be obtained by the selfish link formation process of agents, otherwise the equilibrium network is inefficient. This work should assist in building a theoretical framework of R&D networks from which policies can be derived that aim at fostering efficient innovation networks.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:58:23 GMT" } ]
2009-04-05T00:00:00
[ [ "Koenig", "Michael D.", "" ], [ "Battiston", "Stefano", "" ], [ "Napoletano", "Mauro", "" ], [ "Schweitzer", "Frank", "" ] ]
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712.2753
Genqian Liu
G. Liu
Solution of the Pompeiu problem (II)
This paper has been withdrawn
null
null
null
math.AP
null
This paper has been withdrawn by the author.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 15:59:00 GMT" }, { "version": "v2", "created": "Thu, 27 Dec 2007 09:47:56 GMT" } ]
2007-12-27T00:00:00
[ [ "Liu", "G.", "" ] ]
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712.2754
Jacco van Loon
Jacco Th. van Loon (Keele University, UK)
Observational constraints on AGB mass loss and its effect on AGB evolution
8 pages, with 1 figure presenting new results on the relation between mass loss and stellar radiation and pulsation. To appear in: "XXI Century Challenges for Stellar Evolution", eds. S. Cassisi & M. Salaris, Memorie della Societa` Astronomica Italiana, Vol. 79/2
null
null
null
astro-ph
null
This review discusses some of the observational constraints on what we know about the mass loss experienced by stars in the Asymptotic Giant Branch (AGB) phase of evolution. Mass loss affects the maximum mass attained by the core of an AGB star and hence its fate as a white dwarf or potentially a supernova. The way mass loss depends on stellar initial parameters and time affects the yield from AGB stars, in terms of elemental abundances and types of dust. The role of pulsation, dust formation, chromospheres and other mechanisms which may contribute to mass loss are assessed against observational evidence, and suggestions are made for observations which could force significant new progress in this field in the first decades of the 21st century. A better understanding of AGB mass loss may be gained from a combination with studies of first ascent red giant branch (RGB) stars and red supergiants, through population studies and in different environments.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:00:07 GMT" } ]
2007-12-18T00:00:00
[ [ "van Loon", "Jacco Th.", "", "Keele University, UK" ] ]
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712.2755
Hongsheng Chen
Jingjing Zhang, Yu Luo, Hongsheng Chen, Lixin Ran, Bae-Ian Wu, and Jin Au Kong
Directive Emission Obtained by Coordinate Transformation
15 pages, 5 figures
Progress In Electromagnetics Research, PIER 81, 437?C446 (2008)
10.2528/PIER08011002
null
physics.class-ph
null
We use coordinate transformation theory to realize substrates that can modify the emission of an embedded source. Simulation results show that with proper transformation functions the energy radiated by a source embedded in these space variant media will be concentrated in a narrow beam. The thickness of the slab achieved with our transformations will no longer be restricted by the evanescent modes and the source can be placed at any position along the boundary of the substrate without affecting the radiation pattern. We also discuss the case where reduced parameters are used, which still performs well and is physically realizable.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:03:11 GMT" } ]
2008-07-28T00:00:00
[ [ "Zhang", "Jingjing", "" ], [ "Luo", "Yu", "" ], [ "Chen", "Hongsheng", "" ], [ "Ran", "Lixin", "" ], [ "Wu", "Bae-Ian", "" ], [ "Kong", "Jin Au", "" ] ]
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712.2756
Claudio Fontanari
Claudio Fontanari
Positive divisors on quotients of $\bar{M}_{0,n}$ and the Mori cone of $\bar{M}_{g,n}$
Preliminary version, comments are welcome
null
null
null
math.AG
null
We prove that if $m \ge n-3$ then every $S_m$-invariant F-nef divisor on the moduli space of stable $n$-pointed curves of genus zero is linearly equivalent to an effective combination of boundary divisors. As an application, we determine the Mori cone of the moduli spaces of stable curves of small genus with few marked points.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:08:10 GMT" } ]
2007-12-18T00:00:00
[ [ "Fontanari", "Claudio", "" ] ]
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712.2757
P. James E. Peebles
P. J. E. Peebles
Galaxies as a cosmological test
Nine pages, five figures
Nuovo Cim.B122:1035-1042,2007
10.1393/ncb/i2008-10443-8
null
astro-ph
null
The relativistic LambdaCDM cosmological model has passed a demanding network of tests that convincingly demonstrate it is a useful approximation to what happened back to high redshift. But there are anomalies in its application to structure formation on the scales of galaxies that show we have much to learn about what this theory actually predicts and possibly something also of value to learn about the fundamental theoretical basis for observational cosmology. This is slightly revised and enlarged from a contribution to A Century of Cosmology, Venice, August 2007.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:37:21 GMT" } ]
2010-11-11T00:00:00
[ [ "Peebles", "P. J. E.", "" ] ]
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712.2758
Julia Rausenberger
Julia Rausenberger, Christian Fleck, Jens Timmer, Markus Kollmann
Induction level determines signature of gene expression noise in cellular systems
null
Progress in Biophysics and Molecular Biology, 2009
10.1016/j.pbiomolbio.2009.06.003
null
q-bio.OT
null
Noise in gene expression, either due to inherent stochasticity or to varying inter- and intracellular environment, can generate significant cell-to-cell variability of protein levels in clonal populations. We present a theoretical framework, based on stochastic processes, to quantify the different sources of gene expression noise taking cell division explicitly into account. Analytical, time-dependent solutions for the noise contributions arising from the major steps involved in protein synthesis are derived. The analysis shows that the induction level of the activator or transcription factor is crucial for the characteristic signature of the dominant source of gene expression noise and thus bridges the gap between seemingly contradictory experimental results. Furthermore, on the basis of experimentally measured cell distributions, our simulations suggest that transcription factor binding and promoter activation can be modelled independently of each other with sufficient accuracy.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:16:07 GMT" } ]
2010-04-08T00:00:00
[ [ "Rausenberger", "Julia", "" ], [ "Fleck", "Christian", "" ], [ "Timmer", "Jens", "" ], [ "Kollmann", "Markus", "" ] ]
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712.2759
Eli Dwek
E. Dwek, R. G. Arendt, P. Bouchet, D. N. Burrows, P. Challis, I. J. Danziger, J. M. De Buizer, R. D. Gehrz, R. P. Kirshner, R. McCray, S. Park, E. F. Polomski, and C. E. Woodward
Infrared and X-Ray Evidence for Circumstellar Grain Destruction by the Blast Wave of Supernova 1987A
Accepted for publication in the Astrophysical Journal. Document is 28 pages long and includes 9 figures
null
10.1086/529038
null
astro-ph
null
Multiwavelength observations of supernova remnant (SNR) 1987A show that its morphology and luminosity are rapidly changing at X-ray, optical, infrared, and radio wavelengths as the blast wave from the explosion expands into the circumstellar equatorial ring, produced by mass loss from the progenitor star. The observed infrared (IR) radiation arises from the interaction of dust grains that formed in mass outflow with the soft X-ray emitting plasma component of the shocked gas. Spitzer IRS spectra at 5 - 30 microns taken on day 6190 since the explosion show that the emission arises from ~ 1.1E-6 Msun of silicate grains radiating at a temperature of ~180+20-15 K. Subsequent observations on day 7137 show that the IR flux had increased by a factor of 2 while maintaining an almost identical spectral shape. The observed IR-to-X-ray flux ratio (IRX) is consistent with that of a dusty plasma with standard Large Magellanic Cloud dust abundances. IRX has decreased by a factor of ~ 2 between days 6190 and 7137, providing the first direct observation of the ongoing destruction of dust in an expanding SN blast wave on dynamic time scales. Detailed models consistent with the observed dust temperature, the ionization timescale of the soft X-ray emission component, and the evolution of IRX suggest that the radiating silicate grains are immersed in a 3.5E6 K plasma with a density of (0.3-1)E4 cm^{-3}, and have a size distribution that is confined to a narrow range of radii between 0.023 and 0.22 microns. Smaller grains may have been evaporated by the initial UV flash from the supernova.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:17:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Dwek", "E.", "" ], [ "Arendt", "R. G.", "" ], [ "Bouchet", "P.", "" ], [ "Burrows", "D. N.", "" ], [ "Challis", "P.", "" ], [ "Danziger", "I. J.", "" ], [ "De Buizer", "J. M.", "" ], [ "Gehrz", "R. D.", "" ], [ "Kirshner", "R. P.", "" ], [ "McCray", "R.", "" ], [ "Park", "S.", "" ], [ "Polomski", "E. F.", "" ], [ "Woodward", "C. E.", "" ] ]
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712.276
Patrick Petitjean
Patrick Petitjean (IAP, Paris, France), Cedric Ledoux (ESO, Vitacura, Chile) and R. Srianand (IUCAA, Pune, India)
The Nitrogen and Oxygen abundances in the neutral gas at high redshift
11 pages, 10 Postscript figures
null
10.1051/0004-6361:20078607
null
astro-ph
null
We study the Oxygen and Nitrogen abundances in the interstellar medium of high-redshift galaxies. We use high resolution and high signal-to-noise ratio spectra of Damped Lyman-alpha (DLA) systems detected along the line-of-sight to quasars to derive robust abundance measurements from unsaturated metal absorption lines. We present results for a sample of 16 high-redshift DLAs and strong sub-DLAs (log N(HI)>19.5, 2.4<zabs<3.6) including 13 new measurements. We find that the Oxygen to Iron abundance ratio is pretty much constant with [O/Fe]=+0.32+-0.10 for -2.5<[O/H]<-1.0 with a small scatter around this value. The Oxygen abundance follows quite well the Silicon abundance within 0.2dex although the Silicon abundance could be slightly smaller for [O/H]<-2. The distribution of the [N/O] abundance ratio, measured from components that are detected in both species, is somehow double peaked: five systems have [N/O]>-1 and nine systems have [N/O]<-1.15. In the diagram [N/O] versus [O/H], a loose plateau is possibly present at [N/O]=-0.9 that is below the so-called primary plateau as seen in local metal-poor dwarf galaxies ([N/O] in the range -0.57 to -0.74). No system is seen above this primary plateau whereas the majority of the systems lie well below with a large scatter. All this suggests a picture in which DLAs undergo successive star-bursts. During such an episode, the [N/O] ratio decreases sharply because of the rapid release of Oxygen by massive stars whereas inbetween two bursts, Nitrogen is released by low and intermediate-mass stars with a delay and the [N/O] ratio increases.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:19:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Petitjean", "Patrick", "", "IAP, Paris, France" ], [ "Ledoux", "Cedric", "", "ESO, Vitacura,\n Chile" ], [ "Srianand", "R.", "", "IUCAA, Pune, India" ] ]
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712.2761
Chihiro Sasaki
C. Sasaki (TU Munich), B. Friman (GSI), K. Redlich (Univ. of Wroclaw and TU Darmstadt)
Chiral phase transition in the presence of spinodal decomposition
12 pages, 11 figures
Phys.Rev.D77:034024,2008
10.1103/PhysRevD.77.034024
null
hep-ph nucl-th
null
The thermodynamics of a first order chiral phase transition is considered in the presence of spinodal phase separation within the Nambu-Jona-Lasinio (NJL) model. The properties of the basic thermodynamic observables in the coexistence phase are discussed for zero and non-zero quark masses. We focus on observables that probe the chiral phase transition. In particular, the behavior of the specific heat and entropy as well as charge fluctuations are calculated and analyzed. We show that the specific heat and charge susceptibilities diverge at the isothermal spinodal lines. We determine the scaling behavior and compute the critical exponent $\gamma$ of the net quark number susceptibility at the isothermal spinodal lines within the NJL model and the Ginsburg-Landau theory. We show that in the chiral limit the critical exponent $\gamma=1/2$ at the tricritical point as well as along the isothermal spinodal lines. On the other hand, for finite quark masses the critical exponent at the spinodal lines, $\gamma=1/2$, differs from that at the critical end point, $\gamma=2/3$, indicating a change in the universality class. These results are independent of the particular choice of the chiral Lagrangian and should be common for all mean field approaches.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:34:21 GMT" } ]
2008-11-26T00:00:00
[ [ "Sasaki", "C.", "", "TU Munich" ], [ "Friman", "B.", "", "GSI" ], [ "Redlich", "K.", "", "Univ. of Wroclaw\n and TU Darmstadt" ] ]
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712.2762
Thomas Schutzmeier
M. Czakon, T. Schutzmeier
Double fermionic contributions to the heavy-quark vacuum polarization
12 pages, 5 figures
JHEP0807:001,2008
10.1088/1126-6708/2008/07/001
null
hep-ph
null
We compute the virtual O(\alpha_s^3 n_f^2) corrections to the heavy quark vector current correlator in terms of expansions in the external momentum and as an exact numerical solution. As a byproduct, the available high-energy expansion at the three-loop level is extended.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:27:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Czakon", "M.", "" ], [ "Schutzmeier", "T.", "" ] ]
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712.2763
Pelaez
A. Gomez Nicola, J.R. Pelaez, G. Rios (U. Complutense de Madrid)
The Inverse Amplitude Method and Adler Zeros
17 pages, 4 figures
Phys.Rev.D77:056006,2008
10.1103/PhysRevD.77.056006
null
hep-ph
null
The Inverse Amplitude Method is a powerful unitarization technique to enlarge the energy applicability region of Effective Lagrangians. It has been widely used to describe resonances from Chiral Perturbation Theory as well as for the Strongly Interacting Symmetry Breaking Sector. In this work we show how it can be slightly modified to account also for the sub-threshold region, incorporating correctly the Adler zeros required by chiral symmetry and eliminating spurious poles. These improvements produce negligible effects on the physical region.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:30:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Nicola", "A. Gomez", "", "U. Complutense de Madrid" ], [ "Pelaez", "J. R.", "", "U. Complutense de Madrid" ], [ "Rios", "G.", "", "U. Complutense de Madrid" ] ]
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712.2764
Roman Popovych
Roman O. Popovych
Reduction Operators of Linear Second-Order Parabolic Equations
31 pages, minor misprints are corrected
J. Phys. A: Math. Theor., 2008, V. 41, 185202, 31 pp
10.1088/1751-8113/41/18/185202
null
math.AP math-ph math.MP
null
The reduction operators, i.e., the operators of nonclassical (conditional) symmetry, of (1+1)-dimensional second order linear parabolic partial differential equations and all the possible reductions of these equations to ordinary differential ones are exhaustively described. This problem proves to be equivalent, in some sense, to solving the initial equations. The ``no-go'' result is extended to the investigation of point transformations (admissible transformations, equivalence transformations, Lie symmetries) and Lie reductions of the determining equations for the nonclassical symmetries. Transformations linearizing the determining equations are obtained in the general case and under different additional constraints. A nontrivial example illustrating applications of reduction operators to finding exact solutions of equations from the class under consideration is presented. An observed connection between reduction operators and Darboux transformations is discussed.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:43:23 GMT" }, { "version": "v2", "created": "Wed, 12 Mar 2008 22:17:16 GMT" }, { "version": "v3", "created": "Wed, 16 Apr 2008 19:36:02 GMT" } ]
2008-06-12T00:00:00
[ [ "Popovych", "Roman O.", "" ] ]
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712.2765
Bakhodir Abdullaev
B. Abdullaev, U. R\"ossler, and C.-H. Park
Anyon related correlations in two-dimensional Coulomb gases
3 pages, 1 figure
null
null
null
cond-mat.str-el cond-mat.mes-hall
null
In our recent paper (Phys. Rev. B 76, 075403 (2007)), we have applied the anyon concept to derive an approximate analytic formula for the ground state energy, which applies to two-dimensional (2D) Coulomb systems from the bosonic to the fermionic limit. We make use of these results here to draw attention to correlation effects for two special cases: the spin-polarized 2D fermion system and the charged anyon system close to the bosonic limit. By comparison with quantum Monte-Carlo data (for the former) and exact results obtained in the hypernetted-chain and Bogolyubov approximations (for the latter) we can conclude on correlation effects, which have their origin in the bosonic systems and come into play by using the anyon concept. To our knowledge, these correlations are not yet considered in the literature.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:35:59 GMT" } ]
2007-12-18T00:00:00
[ [ "Abdullaev", "B.", "" ], [ "Rössler", "U.", "" ], [ "Park", "C. -H.", "" ] ]
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712.2766
Janusz Grabowski
Katarzyna Grabowska and Janusz Grabowski
Variational calculus with constraints on general algebroids
23 pages, a few references added, the version to appear in J. Phys. A: Math. Theor
J. Phys. A: Math. Theor. 41 (2008), 175204
10.1088/1751-8113/41/17/175204
null
math-ph math.DG math.MP
null
Variational calculus on a vector bundle E equipped with a structure of a general algebroid is developed, together with the corresponding analogs of Euler-Lagrange equations. Constrained systems are introduced in the variational and in the geometrical setting. The constrained Euler-Lagrange equations are derived for analogs of holonomic, vakonomic and nonholonomic constraints. This general model covers majority of first-order Lagrangian systems which are present in the literature and reduces to the standard variational calculus and the Euler-Lagrange equations in Classical Mechanics for E=TM.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:38:16 GMT" }, { "version": "v2", "created": "Thu, 6 Mar 2008 09:12:50 GMT" } ]
2011-11-22T00:00:00
[ [ "Grabowska", "Katarzyna", "" ], [ "Grabowski", "Janusz", "" ] ]
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712.2767
Teemu Ojanen
Teemu Ojanen and Antti-Pekka Jauho
Mesoscopic photon heat transistor
4 pages, 3 figures
null
10.1103/PhysRevLett.100.155902
null
cond-mat.mes-hall cond-mat.stat-mech
null
We show that the heat transport between two bodies, mediated by electromagnetic fluctuations, can be controlled with an intermediate quantum circuit - leading to the device concept Mesoscopic Photon Heat Transistor (MPHT). Our theoretical analysis is based on a novel Meir-Wingreen-Landauer type of conductance formula, which gives the photonic heat current through an arbitrary circuit element coupled to two dissipative reservoirs at finite temperatures. As an illustration we present an exact solution for the case when the intermediate circuit can be described as an electromagnetic resonator. We discuss in detail how the MPHT can be implemented experimentally in terms of a flux-controlled SQUID circuit.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:39:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Ojanen", "Teemu", "" ], [ "Jauho", "Antti-Pekka", "" ] ]
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712.2768
Paul Bartlett
G. Seth Roberts, Rodrigo Sanchez, Roger Kemp, Tiffany Wood, and Paul Bartlett
Electrostatic charging of non-polar colloids by reverse micelles
null
null
null
null
cond-mat.soft cond-mat.mtrl-sci
null
Colloids dispersed in a non-polar solvent become charged when reverse micelles are added. We study the charge of individual sterically-stabilized poly(methyl methacrylate) spheres dispersed in micellar solutions of the surfactants sodium bis(2-ethyl 1-hexyl) sulfosuccinate [AOT], zirconyl 2-ethyl hexanoate [Zr(Oct)$_{2}$], and a copolymer of poly(12-hydroxystearic acid)--poly(methyl methacrylate) [PHSA-PMMA]. Although the sign of the particle charge is positive for Zr(Oct)$_{2}$, negative for AOT, and essentially neutral for PHSA-PMMA the different micellar systems display a number of common features. In particular, we demonstrate that, over a wide range of concentrations, the colloid charge is independent of the number of micelles added and scales linearly with the colloid size. A simple thermodynamic model, in which the particle charge is generated by the competitive adsorption of both positive and negative micelles, is in good agreement with the experimental data.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:39:06 GMT" } ]
2007-12-18T00:00:00
[ [ "Roberts", "G. Seth", "" ], [ "Sanchez", "Rodrigo", "" ], [ "Kemp", "Roger", "" ], [ "Wood", "Tiffany", "" ], [ "Bartlett", "Paul", "" ] ]
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712.2769
Lukasz Andrzej Glinka
L. A. Glinka
Many-Particle Quantum Cosmology
4 pages in twocolumn Revtex format, submitted to the Proceedings of the 7th International Workshop "Supersymmetries and Quantum Symmetries" July 30 - August 4, 2007
Supersymmetries and Quantum Symmetries (SQS'07) : Proc. of International Workshop, Dubna, Russia, July 30 - Aug.4, 2007/ Ed.: E. Ivanov, S.Fedoruk.- Dubna JINR, 2008, p. 406-411
null
null
hep-th gr-qc
null
The Einstein-Friedmann Universe as whole quantum object can be treated as bosonic string mass groundstate, called a tachyon, having negative mass square and a speed more than the speed of light. I present a brief review of results obtained from this point of view called Many-Particle Quantum Gravity approach - the monodromy problem in the Fock space, thermodynamics of the Universe, and the extremal tachyon mass model.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:42:35 GMT" } ]
2009-10-30T00:00:00
[ [ "Glinka", "L. A.", "" ] ]
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712.277
Pierre Artoisenet
P. Artoisenet, F. Maltoni, T. Stelzer
Automatic generation of quarkonium amplitudes in NRQCD
17 pages, 7 figures
JHEP 0802:102,2008
10.1088/1126-6708/2008/02/102
CP3-07-31
hep-ph
null
We present a simple method to automatically evaluate arbitrary tree-level amplitudes involving the production or decay of a heavy quark pair QQbar in a generic {2S+1}L_J^[1,8] state, i.e., the short distance coefficients appearing in the NRQCD factorization formalism. Our approach is based on extracting the relevant contributions from the open heavy quark-antiquark amplitudes through an expansion with respect to the quark-antiquark relative momentum and the application of suitable color and spin projectors. To illustrate the capabilities of the method and its implementation in MadGraph a few applications to quarkonium collider phenomenology are presented.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:46:53 GMT" } ]
2009-12-15T00:00:00
[ [ "Artoisenet", "P.", "" ], [ "Maltoni", "F.", "" ], [ "Stelzer", "T.", "" ] ]
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712.2771
Matus Medo
Paolo Laureti, Matus Medo, Yi-Cheng Zhang
Analysis of Kelly-optimal portfolios
15 pages, 7 figures; extended list of references and some minor modifications
Quantitative Finance 10, 689-697 (2010)
10.1080/14697680902991619
null
q-fin.PM physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the use of Kelly's strategy in the construction of an optimal portfolio of assets. For lognormally distributed asset returns, we derive approximate analytical results for the optimal investment fractions in various settings. We show that when mean returns and volatilities of the assets are small and there is no risk-free asset, the Kelly-optimal portfolio lies on Markowitz Efficient Frontier. Since in the investigated case the Kelly approach forbids short positions and borrowing, often only a small fraction of the available assets is included in the Kelly-optimal portfolio. This phenomenon, that we call condensation, is studied analytically in various model scenarios.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:53:51 GMT" }, { "version": "v2", "created": "Wed, 27 Aug 2008 12:01:54 GMT" }, { "version": "v3", "created": "Thu, 23 Apr 2009 15:10:18 GMT" } ]
2011-04-08T00:00:00
[ [ "Laureti", "Paolo", "" ], [ "Medo", "Matus", "" ], [ "Zhang", "Yi-Cheng", "" ] ]
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712.2772
Michael Lederer
Michael T. Lederer (Univ. of Vienna), Bernhard Aringer (Univ. of Vienna)
Low temperature mean opacities for the carbon-rich regime
8 pages, 5 figures. To appear in the AIP Proceedings of the IXth Torino Workshop on AGB Nucleosynthesis
AIP Conf.Proc.1001:11-18,2008
10.1063/1.2916953
null
astro-ph
null
Asymptotic Giant Branch (AGB) stars undergo a change in their chemical composition during their evolution. This in turn leads to an alteration of the radiative opacities, especially in the cool layers of the envelope and the atmosphere, where molecules are the dominant opacity sources. A key parameter in this respect is the number ratio of carbon to oxygen atoms (C/O). In terms of low temperature mean opacities, a variation of this parameter usually cannot be followed in stellar evolution models, because up to now tabulated values were only available for scaled solar metal mixtures (with C/O ~ 0.5). We thus present a set of newly generated tables containing Rosseland mean opacity coefficients covering both the oxygen-rich (C/O < 1) and the carbon-rich (C/O > 1) regime. We compare our values to existing tabular data and investigate the relevant molecular opacity contributors.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 18:29:36 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 10:11:04 GMT" } ]
2009-06-23T00:00:00
[ [ "Lederer", "Michael T.", "", "Univ. of Vienna" ], [ "Aringer", "Bernhard", "", "Univ. of\n Vienna" ] ]
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712.2773
Emmanuel Cecchet
Emmanuel Cecchet, George Candea, Anastasia Ailamaki
Middleware-based Database Replication: The Gaps between Theory and Practice
14 pages. Appears in Proc. ACM SIGMOD International Conference on Management of Data, Vancouver, Canada, June 2008
null
null
EPFL technical report DSLAB-REPORT-2007-001
cs.DB cs.DC cs.PF
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The need for high availability and performance in data management systems has been fueling a long running interest in database replication from both academia and industry. However, academic groups often attack replication problems in isolation, overlooking the need for completeness in their solutions, while commercial teams take a holistic approach that often misses opportunities for fundamental innovation. This has created over time a gap between academic research and industrial practice. This paper aims to characterize the gap along three axes: performance, availability, and administration. We build on our own experience developing and deploying replication systems in commercial and academic settings, as well as on a large body of prior related work. We sift through representative examples from the last decade of open-source, academic, and commercial database replication systems and combine this material with case studies from real systems deployed at Fortune 500 customers. We propose two agendas, one for academic research and one for industrial R&D, which we believe can bridge the gap within 5-10 years. This way, we hope to both motivate and help researchers in making the theory and practice of middleware-based database replication more relevant to each other.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 18:42:15 GMT" }, { "version": "v2", "created": "Wed, 5 Nov 2008 20:53:51 GMT" } ]
2008-11-05T00:00:00
[ [ "Cecchet", "Emmanuel", "" ], [ "Candea", "George", "" ], [ "Ailamaki", "Anastasia", "" ] ]
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712.2774
Alejandro Luque
A. Luque, U. Ebert and W. Hundsdorfer
Interaction of streamers in air and other oxygen-nitrogen mixtures
4 pages, 4 figures
Phys. Rev. Lett. 101, 075005 (2008)
10.1103/PhysRevLett.101.075005
null
physics.plasm-ph physics.ao-ph physics.flu-dyn
null
The interaction of streamers in nitrogen-oxygen mixtures such as air is studied. First, an efficient method for fully three-dimensional streamer simulations in multiprocessor machines is introduced. With its help, we find two competing mechanisms how two adjacent streamers can interact: through electrostatic repulsion and through attraction due to nonlocal photo-ionization. The non-intuitive effects of pressure and of the nitrogen-oxygen ratio are discussed. As photo-ionization is experimentally difficult to access, we finally suggest to measure it indirectly through streamer interactions.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 17:00:04 GMT" }, { "version": "v2", "created": "Tue, 13 May 2008 18:48:04 GMT" } ]
2008-08-19T00:00:00
[ [ "Luque", "A.", "" ], [ "Ebert", "U.", "" ], [ "Hundsdorfer", "W.", "" ] ]
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712.2775
Johannes Walcher
Johannes Walcher
Evidence for Tadpole Cancellation in the Topological String
57 pages, 9 figures, v2: minor clarifications
null
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the topological string on compact Calabi-Yau threefolds in the presence of orientifolds and D-branes. In examples, we find that the total topological string amplitude admits a BPS expansion only if the topological charge of the D-brane is equal to that of the orientifold plane. We interpret this as a manifestation of a general tadpole cancellation condition in the topological string that is necessary for decoupling of A- and B-model in loop amplitudes. Our calculations in the A-model involve an adapted version of existing localization techniques, and give predictions for the real enumerative geometry of higher genus curves in Calabi-Yau manifolds. In the B-model, we introduce an extension of the holomorphic anomaly equation to unoriented strings.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 20:00:42 GMT" }, { "version": "v2", "created": "Wed, 4 Feb 2009 14:36:02 GMT" } ]
2009-02-04T00:00:00
[ [ "Walcher", "Johannes", "" ] ]
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712.2776
Bayet Estelle
E. Bayet, S. Viti, D.A. Williams, J.M.C. Rawlings
Molecular tracers of high mass star-formation in external galaxies
11 pages, 8 figures, accepted in ApJ
null
10.1086/528678
null
astro-ph
null
Hot core molecules should be detectable in external active galaxies out to high redshift. We present here a detailed study of the chemistry of star-forming regions under physical conditions that differ significantly from those likely to be appropriate in the Milky Way Galaxy. We examine, in particular, the trends in molecular abundances as a function of time with respect to changes in the relevant physical parameters. These parameters include metallicity, dust:gas mass ratio, the H$_{2}$ formation rate, relative initial elemental abundances, the cosmic ray ionization rate, and the temperature of hot cores. These trends indicate how different tracers provide information on the physical conditions and on evolutionary age. We identify hot core tracers for several observed galaxies that are considered to represent spirals, active galaxies, low-metallicity galaxies, and high-redshift galaxies. Even in low-metallicity examples, many potential molecular tracers should be present at levels high enough to allow unresolved detection of active galaxies at high redshift containing large numbers of hot cores.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 17:10:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Bayet", "E.", "" ], [ "Viti", "S.", "" ], [ "Williams", "D. A.", "" ], [ "Rawlings", "J. M. C.", "" ] ]
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712.2777
Anupam Mazumdar
Shinji Hirano and Anupam Mazumdar
Emergence of a Big Bang singularity in an exact string background
5 pages, 1 figure, added a reference
null
null
null
hep-th astro-ph gr-qc hep-ph
null
The origin of Big Bang singularity in 3+1 dimensions can be understood in an exact string theory background obtained by an analytic continuation of a cigar like geometry with a nontrivial dilaton. In a T-dual conformal field theory picture there exists a closed string tachyon potential which excises the singular space-time of a strongly coupled regime to ensure that a higher dimensional universe has no curvature singularity. However in 3+1 dimensions the universe exhibits all the pathology of a standard Big Bang cosmology. The emergence of a singularity now owes to a higher dimensional orbifold singularity which does not have a curvature singularity in higher dimensions, suggesting that close to the compactification scale an effective description of 3+1 dimensions breaks down and bouncing universe emerges in 5 and higher dimensions.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 17:11:25 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 18:37:53 GMT" } ]
2011-11-10T00:00:00
[ [ "Hirano", "Shinji", "" ], [ "Mazumdar", "Anupam", "" ] ]
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712.2778
W. M. Stuckey
W.M. Stuckey and Michael Silberstein
Unification per the Relational Blockworld
33 pages. A discrete renormalization procedure is introduced
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use the Relational Blockworld (RBW) interpretation of quantum mechanics to resolve the foundational problems therein. As predicted by Smolin, the resolution of these problems is not independent of the problem of unification and the nature of time. Specifically, RBW requires a theory fundamental to quantum physics in which one must explicitly construct dynamical/diachronic entities (objects obtained via trans-temporal identification) from 'relations'. We use discrete graph theory to propose heuristically the nature of this underlying theory, which is based on a self-consistency criterion for the mutual construct of dynamical/diachronic entities, space and time whence a spatiotemporally discrete action fundamental to the path integral approach to quantum and classical physics. The proposed unification scheme suggests a novel approach to quantum gravity.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 17:14:36 GMT" }, { "version": "v2", "created": "Mon, 31 Dec 2007 00:43:28 GMT" }, { "version": "v3", "created": "Tue, 18 Mar 2008 16:10:38 GMT" }, { "version": "v4", "created": "Wed, 8 Oct 2008 18:34:59 GMT" }, { "version": "v5", "created": "Wed, 26 Nov 2008 21:36:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Stuckey", "W. M.", "" ], [ "Silberstein", "Michael", "" ] ]
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