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Black holes and stars as particle detectors

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If you have a question about this talk, please contact Benson Way .

Superradiance is a very generic process involving dissipative systems, whereby energy is transferred from one medium to another, typically stimulated by wave scattering. Various mechanisms (as diverse as massive fields, magnetic fields, anti-de Sitter boundaries, nonlinear interactions, etc…) can confine the amplified radiation and give rise to strong instabilities. Linear studies of the instability have been used to impose strong constraints on ultralight bosons around rotating black holes, turning black holes into particle detectors. In this talk I will describe the most recent developments on this subject. In particular I will describe how the instability develops in the presence of accretion and gravitational-wave emission and will show that even stars can become superradiantly unstable once appropriate dissipation mechanisms are included.

This talk is part of the DAMTP Friday GR Seminar series.

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