Speaker
Bohua Li
(Guangxi University)
Description
Massive scalar field around a Kerr black hole can induce superradiant instabilities, resulting in the formation of a boson cloud around the black hole. Since rotating stellar-mass black holes are ubiquitous in every galaxy, the gravitational waves (GWs) emitted by their associated boson clouds together constitute a stochastic background on the sky, if cosmological dark matter consists of ultralight bosons. Here we study the anisotropy signal of this GW background (GWB). We demonstrate that the GWB anistropies trace large-scale dark matter fluctuations and thus serve as an indirect probe of ultralight boson dark matter.
Primary author
Bohua Li
(Guangxi University)
