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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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57 papers · 1 filter
Quantum states of elementary three-geometry
G. Carbone, M. Carfora, A. Marzuoli
We introduce a quantum volume operator in three--dimensional Quantum Gravity by taking into account a symmetrical coupling scheme of three SU(2) angular momenta. The spectrum o…
Atmospheric Analysis of the M/L- and M/T-Dwarf Binary Systems LHS 102 and Gliese 229
S. K. Leggett, Peter H. Hauschildt, F. Allard +2
We present 0.9-2.5um spectroscopy with R~800 and 1.12-1.22um spectroscopy with R~5800 for the M dwarfs Gl 229A and LHS 102A, and for the L dwarf LHS 102B. We also report IZJHKL' ph…
A Hydrodynamic model for a dynamical jammed-to-flowing transition in gravity driven granular media
Lyderic Bocquet, Jalal Errami, Tom. C. Lubensky
Granular material on an inclined plane will flow like a fluid if the angle the plane makes with the horizontal is large enough. We employ a modification of a hydrodynamic model…
Nishimori point in random-bond Ising and Potts models in 2D
A. Honecker, J. L. Jacobsen, M. Picco +1
We study the universality class of the fixed points of the 2D random bond q-state Potts model by means of numerical transfer matrix methods. In particular, we determine the critica…
A Model of Sequence Dependent Protein Diffusion Along Dna
Maria Barbi, Christophe Place, Vladislav Popkov +1
We introduce a probabilistic model for protein sliding motion along DNA during the search of a target sequence. The model accounts for possible effects due to sequence-dependent in…
Intermittency and non-Gaussian fluctuations of the global energy transfer in fully developed turbulence
B. Portelli, P. C. W. Holdsworth, J. -F. Pinton
We address the experimentally observed non-Gaussian fluctuations for the energy injected into a closed turbulent flow at fixed Reynolds number. We propose that the power fluctuatio…
Er2Ti2O7: Evidence of Order by Disorder in a Frustrated Antiferromagnet
J. D. M. Champion, M. J. Harris, P. C. W. Holdsworth +14
Er_2Ti_2O_7 has been suggested to be a realization of the frustrated < 111 > XY pyrochlore lattice antiferromagnet, for which theory predicts fluctuation-induced symmetry breaking…
The Galactic disk mass-budget : II. Brown dwarf mass-function and density
G. Chabrier
In this paper, we extend the calculations conducted previously in the stellar regime to determine the brown dwarf IMF in the Galactic disk. We perform Monte Carlo calculations taki…
Evolutionary models for low-mass stars and brown dwarfs: uncertainties and limits at very young ages
I. Baraffe, G. Chabrier, F. Allard +1
We analyse pre-Main Sequence evolutionary tracks for low mass stars with masses $m \le 1.4 \msol$ based on the Baraffe et al. (1998) input physics. We also extend the recent Chabri…
Site-centered impurities in quantum spin chains
P. Pujol, J. Rech
The magnetic behavior of antiferromagnetic spin 1/2 chains with site-centered impurities in a magnetic field is investigated. The effect of impurities is implemented by considering…
Partial Supersymmetry Breaking and AdS4 Supermembrane
F. Delduc, E. Ivanov, S. Krivonos
We consider partial spontaneous breaking of N=1 AdS4 supersymmetry OSp(1|4) down to N=1, d=3 Poincare supersymmetry in the nonlinear realizations framework. We construct the corres…
Superfield Noether Procedure
M. Magro, I. Sachs, S. Wolf
We develop a superspace Noether procedure for supersymmetric field theories in 4-dimensions for which an off-shell formulation in ordinary superspace exists. In this way we obtain…
A unified equation of state of dense matter and neutron star structure
F. Douchin, P. Haensel
An equation of state (EOS) of neutron star matter, describing both the neutron star crust and the liquid core, is calculated. It is based on the effective nuclear interaction SLy o…
Nonequilibrium dynamics and fluctuation-dissipation relation in a sheared fluid
Ludovic Berthier, Jean-Louis Barrat
The nonequilibrium dynamics of a binary Lennard-Jones mixture in a simple shear flow is investigated by means of molecular dynamics simulations. The range of temperature investigat…
Effective Temperatures of late L dwarfs and the onset of Methane signatures
Andreas Schweitzer, John E. Gizis, Peter H. Hauschildt +3
We present a spectral analysis of a sample of late L dwarfs. We use our latest model atmospheres and synthetic spectra and optical and K band spectra to determine effective tempera…
Microcanonical solution of lattice models with long range interactions
Julien Barre
We present a general method to obtain the microcanonical solution of lattice models with long range interactions. As an example, we apply it to the long range Ising chain, focusing…
Shearing a Glassy Material: Numerical Tests of Nonequilibrium Mode-Coupling Approaches and Experimental Proposals
Ludovic Berthier, Jean-Louis Barrat
The predictions of a nonequilibrium schematic mode-coupling theory developed to describe the nonlinear rheology of soft glassy materials have been numerically challenged in a shear…
Leafwise Holomorphic Functions
R. Feres, A. Zeghib
It is a well-known and elementary fact that a holomorphic function on a compact complex manifold without boundary is necessarily constant. The purpose of the present article is to…
Universal Fluctuations of the Danube Water Level: a Link with Turbulence, Criticality and Company Growth
Steven. T. Bramwell, Tom Fennell, Peter C. W. Holdsworth +1
A global quantity, regardless of its precise nature, will often fluctuate according to a Gaussian limit distribution. However, in highly correlated systems, other limit distributio…
Reply to Comment on "Universal Fluctuations in Correlated Systems", by B. Zheng and S. Trimper, cond-mat/0109003
S. T. Bramwell, K. Christensen, J. -Y. Fortin +7
We reply to the comment on our published paper `` Universal Fluctuations in Correlated Systems'',Phys. Rev. Lett. Vol; 84, p3744 (2000), by B. Zheng and S. Trimper, cond-mat/010900…
Slow Kinetics of Capillary Condensation in Confined Geometry: Experiment and Theory
F. Restagno, L. Bocquet, J. Crassous +1
When two solid surfaces are brought in contact, water vapor present in the ambient air may condense in the region of the contact to form a liquid bridge connecting the two surfaces…
Surfing on a critical line: Rejuvenation without chaos, Memory without a hierarchical phase space
Ludovic Berthier, Peter C. W. Holdsworth
The dynamic behaviour of glassy materials displays strong nonequilibrium effects, such as ageing in simple protocols, memory, rejuvenation and Kovacs effects in more elaborated exp…
The effect of disorder on the fracture nucleation process
S. Ciliberto, A. Guarino, R. Scorretti
The statistical properties of failure are studied in a fiber bundle model with thermal noise. We show that the macroscopic failure is produced by a thermal activation of microcrack…
Boundary G/G theory and topological Poisson-Lie sigma model
Fernando Falceto, Krzysztof Gawedzki
We study a boundary version of the gauged WZW model with a Poisson-Lie group G as the target. The Poisson-Lie structure of G is used to define the Wess-Zumino term of the action on…