2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28716We investigate the propagation of zero sound in two-species interpenetrating Bose-Einstein condensates. In very elongated clouds, this propagation is shown to be essentially one-dimensional. We also present 1D numerical experiments that exhibit the existence of two different sound pulses with velocities consistent with the theoretical predictions.5 pages and 1 figureStatistical Mechanicstext