2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/105162A Bose-Einstein Condensate (BEC) made of alkali-metal atoms at ultra-low temperatures is well described by the three-dimensional cubic nonlinear Schrödinger equation, the so-called Gross-Pitaevskii equation (GPE). Here we consider an attractive BEC in a ring and by solving the GPE we predict the existence of bright solitons with single and multi-peaks, showing that they have a limited domain of dynamical stability. We also discuss finite-temperature effects on the transition from the uniform phase to the localized phase.3 pages, 2 figures. Presented to the School/Workshop 'Let us Face Chaos', Maribor 2005. To be published in the ProceedingsPattern Formation and Solitonstext