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Title: Beyond the Gross-Pitaevskii approximation: Local density versus correlated basis approach for trapped bosons
Author: Fabrocini, A.
Polls Martí, Artur
Keywords: Estadística quàntica
Constitució de la matèria
Excitació nuclear
Quantum statistics
Constitution of matter
Nuclear excitation
Issue Date: 1999
Publisher: The American Physical Society
Abstract: 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.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review A, 1999, vol. 60, núm. 3, p. 2319-2323.
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ISSN: 1050-2947
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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