Termination of Black Hole Superradiance from a Binary Companion

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• Xi Tong, University of Cambridge
• Friday 06 October 2023, 13:00-14:00
• Potter room/Zoom.

If you have a question about this talk, please contact Xi Tong.

Black hole superradiance instability is an old topic studied extensively in the context of astrophysics, gravity and dark matter. A rotating black hole grows a cloud of massive bosons via superradiance instability, forming a Gravitational Atom (GA). Many interesting phenomena of the GA assumes its isolation. In this talk, however, I would like to emphasize the importance of a binary companion and its impact on the GA phenomenology. We will see that the tidal perturbation from a binary can suppress, and even terminate the process of superradiance. This effect poses strong constraints on the GA resonant transitions, while relaxing the ultralight boson mass bound from gravitational wave null detections. We also discuss observing the backreaction effects and how the boson cloud can resist the termination effect by modulating binary orbital parameters.

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

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