Accretion of scalar hair onto black holes

The behaviour of low mass scalar fields around black holes is of great interest in the context of dark matter models consisting of a massive scalar field (such as the axion) and the new era of gravitational wave astronomy. I will discuss three related projects concerning the accretion of minimally coupled low mass scalar fields around black holes: the growth of accretion driven scalar hair around Kerr black holes (https://arxiv.org/abs/2011.07870), the quasi-normal modes of growing hairy Schwarzschild black holes (https://arxiv.org/pdf/2103.00026.pdf), and our preliminary work on the accretion of scalar fields around black hole binaries. Throughout I will describe the prospects for detectable gravitational wave signals, and the methods we used to explore the dynamics of these systems.

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Zoom Meeting ID: 852 8915 0495

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