Exotic compact object behavior in black hole analogues

Abstract

Classical phenomenological aspects of acoustic perturbations on a draining bathtub geometry where a surface with reflectivity $\mathcal{R}$ is set at a small distance from the would-be acoustic horizon, which is excised, are addressed. Like most exotic compact objects featuring an ergoregion but not a horizon, this model is prone to instabilities when $|\mathcal{R}{|}^2\approx 1$. However, stability can be attained for sufficiently slow drains when $|\mathcal{R}{|}^2\lesssim 70\%$. It is shown that the superradiant scattering of acoustic waves is more effective when their frequency approaches one of the system's quasi-normal mode frequencies.

12 pages, 6 figures. Accepted for publication as a Regular Article in Physical Review D

References in corpus (44)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO and Virgo during the First and Second Observing Runs
• GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence
• GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2
• Quasinormal modes of black holes and black branes
• GW170814: A Three-Detector Observation of Gravitational Waves from a Binary Black Hole Coalescence
• GW170608: Observation of a 19-solar-mass Binary Black Hole Coalescence
• Analogue Gravity
• The fuzzball proposal for black holes: an elementary review
• Acoustic black holes: horizons, ergospheres, and Hawking radiation
• Gravitational Vacuum Condensate Stars
• The observational evidence for horizons: from echoes to precision gravitational-wave physics
• Light ring stability in ultra-compact objects
• Tests for the existence of horizons through gravitational wave echoes
• Proca Stars: gravitating Bose-Einstein condensates of massive spin 1 particles
• Gravity wave analogs of black holes
• Fate of gravitational collapse in semiclassical gravity
• Ergoregion instability of ultra-compact astrophysical objects
• Quasinormal modes and classical wave propagation in analogue black holes
• The Kerr Metric
• Not quite a black hole
• Astrophysical Violations of the Kerr Bound as a Possible Signature of String Theory
• `Superresonance' from a rotating acoustic black hole
• Exotic Compact Objects and How to Quench their Ergoregion Instability
• Ergoregion instability of exotic compact objects: electromagnetic and gravitational perturbations and the role of absorption
• Gravitational instabilities of superspinars
• Quasinormal modes and stability of the rotating acoustic black hole: numerical analysis
• Reflection coefficient for superresonant scattering
• Vortex geometry for the equatorial slice of the Kerr black hole
• Instability of hyper-compact Kerr-like objects
• Detecting Rotational Superradiance in Fluid Laboratories
• The w-mode instability of ultracompact relativistic stars
• Black holes as collapsed polymers
• Scattering by a draining bathtub vortex
• Black holes as bubbles of AdS
• Charged reflecting stars supporting charged massive scalar field configurations
• Superradiant scattering of dispersive fields
• Onset of superradiant instabilities in rotating spacetimes of exotic compact objects
• Spectral lines of extreme compact objects
• Superradiant instabilities in the Kerr-mirror and Kerr-AdS black holes with Robin boundary conditions
• Ultra-spinning exotic compact objects supporting static massless scalar field configurations
• Acoustic black holes
• Synchronized stationary clouds in a static fluid
• Marginally stable resonant modes of the polytropic hydrodynamic vortex

Cited by in corpus (2)

• Acoustic black holes in curved spacetime and emergence of analogue Minkowski metric
• Energy bounds and ergoregion instability in Einstein-Maxwell-Scalar field models