Near-horizon microstructure and superradiant instability of black holes

Abstract

Ultralight bosons, as important candidates of dark matter, can condense around spinning black holes (BHs) to form long-lived ``boson clouds'' due to superradiance instability. The boson-BH system can be observed through gravitational wave detection and may become a new window to find traces of ultralight bosons. In this letter we explore the effects on the superradiant instability of BHs from the near-horizon microstructure. By introducing the reflection parameter near a BH horizon, we derived analytical results on the corrections to both energy levels of bosonic cloud and its characteristic frequencies of superradiance instability. Our results imply that the evolution of a boson-BH system and gravitational waves it emits would be influenced by the near-horizon physics of a BH.

5 pages

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Cited by in corpus (7)

• Constraints on the ultralight scalar boson from Advanced LIGO and Advanced Virgo's first three observing runs using the stochastic gravitational-wave background
• Improved Analytic Solution of Black Hole Superradiance
• Superradiance in massive vector fields with spatially varying mass
• Superradiant instabilities of massive bosons around exotic compact objects
• On the Interaction between Ultralight Bosons and Quantum-Corrected Black Holes
• Conditions for superradiant instability of the Kerr-Newman black holes
• Superradiant instability of area quantized Kerr black hole with discrete reflectivity