Fabrocini, A.Polls Martí, Artur2009-10-062009-10-0619991050-2947https://hdl.handle.net/2445/9554We 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.5 p.application/pdfeng(c) The American Physical Society, 1999Estadística quànticaConstitució de la matèriaIonitzacióExcitació nuclearQuantum statisticsConstitution of matterIonizationNuclear excitationinfo:eu-repo/semantics/article151273info:eu-repo/semantics/openAccess