2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/17856In this paper we study a gaseous Bose-Einstein condensate (BEC) and show that: (i) A minimum value of the interaction is needed for the existence of stable persistent currents. (ii) Vorticity is not a fundamental invariant of the system, as there exists a conservative mechanism which can destroy a vortex and change its sign. (iii) This mechanism is suppressed by strong interactions.4 pages with 3 figures. Submitted to Phys. Rev. LettSoft Condensed MatterPattern Formation and Solitonstext