2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34390Artificial black holes, such as sonic holes in Bose-Einstein condensates, may give insights into the role of the physics at the event horizon beyond the Planck scale. We show that sonic white holes give rise to a discrete spectrum of instabilities that is insensitive to the analogue of trans-Planckian physics for Bose-Einstein condensates.General Relativity and Quantum Cosmologytext