Gross–Pitaevskii Acoustic Firewalls Emerge From Vanishing Phonon Entanglement

Researchers have pinpointed a specific moment, the “Page time”, when entanglement between outgoing and interior sound waves vanishes within a specially prepared Bose-Einstein condensate, leading to the formation of what they term an acoustic firewall. This work, published by N.S. Akintsov of Nantong University and colleagues from Kuban State University, Joint-Stock Company “Center for Research and Development” and Shenzhen MSU-BIT University models the black hole information paradox using analogue gravity and Hawking-like phonon radiation. The team demonstrates that after the analogue Page time, unitarity forces this entanglement to vanish, resulting in a detectable differential phonon-calorimetry signal. Measuring the energy density near this analogue horizon would reveal a signature…