Superradiant instability of area quantized Kerr black hole with discrete reflectivity

TL;DR

This paper investigates how quantum area quantization of Kerr black holes affects superradiant instabilities and bosonic cloud formation, revealing that discrete reflectivity can suppress or terminate superradiance.

Contribution

It introduces the concept of discrete reflectivity in area quantized Kerr black holes and analyzes its impact on superradiant instability and bosonic cloud formation.

Findings

Discrete reflectivity leads to specific superradiant mode solutions.

Area quantization can terminate superradiance as black holes spin down.

Superradiance may be suppressed or prevented by quantum effects.

Abstract

Ultralight bosons can condense to form the so-called bosonic clouds around spinning black holes by superradiance instability. When quantum effects are taken into account, the classical black holes were replaced by exotic compact objects including area quantized black holes. In this work, we consider the superradiant instabilities of massive scalar fields around area quantized Kerr black hole. We introduce the reflectivity of area quantized black hole possesses the distinct discrete feature, and the scalar fields have the superradiant modes solution only within the specific mass range. In addition, the area quantization may terminate the superradiance when the black hole spins down, or even suppress the formation of the bosionic cloud.