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Modulating binary dynamics via the termination of black hole superradiance

Published 28 Nov 2023 in gr-qc, astro-ph.HE, hep-ph, and hep-th | (2311.17013v3)

Abstract: A superradiant cloud of ultralight bosons near a rotating black hole provides a smoking gun for particle physics in the infrared. However, tidal perturbations from a nearby binary companion can destabilise the boson cloud and even terminate superradiance. In this work, we consider the backreaction of superradiance termination to the dynamics of general binary orbits parametrised by their semi-latus rectum, eccentricity and inclination angle. Our analysis focuses on Extreme Mass Ratio Inspiral (EMRI) systems and employs the period-average approximation to derive evolution equations of these binary parameters in the Newtonian limit. We find that the binary evolution history can be significantly modulated by the backreaction towards large circular equatorial orbits with reduced termination rate. This process can generically happen even away from the resonance bands. Our work therefore serves as a first step towards probing ultralight bosons through the statistics of EMRI binary parameters in the future.

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Authors (4)

  1. Kaiyuan Fan 
  2. Xi Tong 
  3. Yi Wang 
  4. Hui-Yu Zhu 

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