paper

Probing vector hair of black holes with extreme mass ratio inspirals

arXiv:2212.09346 · doi:10.1103/PhysRevD.107.044053

Abstract

The bumblebee gravity model, with a vector field nonminimally coupled to gravity, is a natural extension of the Einstein-Maxwell theory. In this theory, a black hole can carry a vector hair, making the metric deviate from the Schwarzschild metric. To investigate the detectability of the vector hair, we consider an Extreme Mass Ratio Inspiral (EMRI) system, where a stellar-mass black hole inspiraling into a supermassive black hole. We find that, with a one-year observation of an EMRI by a space-based gravitational-wave detector, we can probe the vector charge as small as in the bumblebee gravity model, which is about three orders of magnitude tighter comparing to current EHT observations.

arXiv comment8 pages, 4 figures

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