2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/120459Sound waves are observed and studied in an optically trapped degenerate Fermi gas of spin-up and spin-down atoms with magnetically tunable interactions. Measurements are made throughout the crossover region, from a weakly-interacting Fermi gas through the resonant Fermi superfluid regime to a Bose condensate of dimer molecules. The measured sound velocities test the equation of state and confirm the universal hypothesis.4 pages, 5 figuresOther Condensed Mattertext