Acoustic black-hole bombs and scalar clouds in a photon-fluid model

Massive bosonic fields in the background of a Kerr black hole can either trigger superradiant instabilities (black-hole bombs) or form equilibrium configurations corresponding to pure bound states, known as stationary scalar clouds. Here, similar phenomena are shown emerge fluctuation dynamics rotating photon-fluid model. In presence suitable vortex flows, density fluctuations governed by massive Klein-Gordon equation on ($2+1$) curved spacetime, possessing an ergoregion and event horizon. We report originating from quasibound phonon states trapped and, remarkably, existence modes synchronous rotation with These represent acoustic counterpart astrophysical Our system offers promising platform for analogue gravity experiments bosons black-hole-field configurations.