Title:
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Beyond the Gross-Pitaevskii approximation: Local density versus correlated basis approach for trapped bosons
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Author:
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Fabrocini, A.; Polls Martí, Artur
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Other authors:
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Universitat de Barcelona |
Abstract:
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We study the ground state of a system of Bose hard-spheres trapped in an isotropic harmonic potential to investigate the effect of the interatomic correlations and the accuracy of the Gross-Pitaevskii equation. We compare a local density approximation, based on the energy functional derived from the low density expansion of the energy of the uniform hard sphere gas, and a correlated wave function approach which explicitly introduces the correlations induced by the potential. Both higher order terms in the low density expansion, beyond Gross-Pitaevskii, and explicit dynamical correlations have effects of the order of percent when the number of trapped particles becomes similar to that attained in recent experiments. |
Subject(s):
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-Estadística quàntica -Constitució de la matèria -Ionització -Excitació nuclear -Quantum statistics -Constitution of matter -Ionization -Nuclear excitation |
Rights:
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(c) The American Physical Society, 1999
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Document type:
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Article Article - Published version |
Published by:
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The American Physical Society
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