2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28638We show that the energetic instability of dark solitons is associated with particle-like motion, and present a simple equation of motion, based on the Mössbauer effect, for dark solitons propagating in inhomogeneous Thomas-Fermi clouds. Numerical simulations support our theory. We discuss some experimental approaches.4 pages, three figuresCondensed MatterPattern Formation and SolitonsAtomic PhysicsQuantum Physicstext