2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/124247The stability of a Bose condensed gas with a negative scattering length is studied with regard to the role played by the initial state. A trapped ideal gas ground state is shown to be unstable when the Gross Pitaevskii equation still predicts the existence of a stable state. A possible relation to a recent experimental study of the critical conditions for stability or collapse of a Bose Einstein condensate [J.L. Roberts et al., Phys. Rev. Lett. 86, 4211 (2001)] is discussed.4 pages, 4 Postscript figuresCondensed Mattertext