Superradiance in acoustic black hole

TL;DR

This study explores superradiance in solid material acoustic black holes through theoretical and numerical methods, revealing weaker amplification than in cylinders and similarities across models at the same scale.

Contribution

First analysis of superradiance in solid material acoustic black holes using simulations, showing weaker effects and model similarities at the same physical scale.

Findings

Superradiance occurs when the general condition is met.

Amplification is weaker in solid material acoustic black holes.

Different models show similar behavior at the same scale.

Abstract

Rotating superradiance in cylindrical geometries has recently been observed experimentally using acoustic waves, shedding light on the superradiant phenomenon in black holes. In this paper, we study superradiance in acoustic black holes made with solid material for the first time, using theoretical analysis and numerical simulations in COMSOL Multiphysics. We find that superradiance can occur in acoustic black holes when the general superradiance condition is met. We also find that the amplification effect is significantly weaker in acoustic black holes than in regular cylinders, due to absorption within the black holes. Furthermore, we have found that different acoustic black hole models exhibit similar superradiance behavior at the same physical scale, which is also consistent with the phenomena in extremal Kerr black holes. We also present that the solid material ABH model has the most degrees of freedom.