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

Abstract

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 to emerge in the fluctuation dynamics of a rotating photon-fluid model. In the presence of suitable vortex flows, the density fluctuations are governed by the massive Klein-Gordon equation on a (2+1) curved spacetime, possessing an ergoregion and an event horizon. We report on superradiant instabilities originating from quasi-bound phonon states trapped by the vortex background and, remarkably, on the existence of stationary modes in synchronous rotation with the horizon. These represent the acoustic counterpart of astrophysical scalar clouds. Our system offers a promising platform for analogue gravity experiments on superradiant instabilities of massive bosons and black-hole-field equilibrium configurations.

11 pages, 5 figures

References in corpus (11)

• Instability of the massive Klein-Gordon field on the Kerr spacetime
• Shocks in nonlocal media
• Kerr-Newman scalar clouds
• Stability and quasinormal modes of the massive scalar field around Kerr black holes
• Kerr-Newman black holes with stationary charged scalar clouds
• A new spin on black hole hair
• Acoustic black holes in a two-dimensional "photon-fluid"
• The large-mass limit of cloudy black holes
• Scalar clouds and the superradiant instability regime of Kerr-Newman black hole
• Acoustic clouds: standing sound waves around a black hole analogue
• Superradiant scattering in fluids of light

Cited by in corpus (11)

• Analogue simulations of quantum gravity with fluids
• Analog Schwarzschild black holes of Bose-Einstein condensates in a cavity: Quasinormal modes and quasibound states
• Perturbing the vortex: quasinormal and quasibound spectra of rotating acoustic geometries
• Incoherent localized structures and hidden coherent solitons from the gravitational instability of the Schrödinger-Poisson equation
• No-short scalar hair theorem for spinning acoustic black holes in a photon-fluid model
• Stationary scalar clouds supported by rapidly-rotating acoustic black holes in a photon-fluid model
• Shielding of Penrose superradiance in optical black holes
• Effective information bounds in modified quantum mechanics
• Bound Bogoliubov quasiparticles in photon superfluids
• Quasibound states of massive charged scalars around dilaton black holes in $2+1$ dimensions: Exact frequencies
• Phonons mimicking doubly special relativity kinematics