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119 papers · 1 filter
Square ice, alternating sign matrices and classical orthogonal polynomials
F. Colomo, A. G. Pronko
The six-vertex model with Domain Wall Boundary Conditions, or square ice, is considered for particular values of its parameters, corresponding to 1-, 2-, and 3-enumerations of Alte…
Relativistic MHD simulations of pulsar bow-shock nebulae
N. Bucciantini, E. Amato, L. Del Zanna
Pulsar bow-shock nebulae are a class of pulsar wind nebulae (PWNe) that form when the pulsar wind is confined by the ram pressure of the ambient medium, and are usually associated…
Small-scale anisotropy and intermittency in high and low-latitude solar wind
A. Bigazzi, L. Biferale, S. M. A. Gama +1
We analyze low and high--latitude fast solar wind data from the Ulysses spacecraft from 1992 to 1994 using a a systematic method to analyse the anisotropic content of the magnetic…
Entanglement and factorized ground states in two-dimensional quantum antiferromagnets
Tommaso Roscilde, Paola Verrucchi, Andrea Fubini +2
Making use of exact results and quantum Monte Carlo data for the entanglement of formation, we show that the ground state of anisotropic two-dimensional S=1/2 antiferromagnets in a…
Unstable regimes for a Bose-Einstein condensate in an optical lattice
L. De Sarlo, L. Fallani, J. E. Lye +4
We report on the experimental characterization of energetic and dynamical instability, two mechanisms responsible for the breakdown of Bloch waves in a Bose-Einstein condensate int…
A Bose-Einstein condensate in a random potential
J. E. Lye, L. Fallani, M. Modugno +3
An optical speckle potential is used to investigate the static and dynamic properties of a Bose-Einstein condensate in the presence of disorder. For strong disorder the condensate…