Waves from the Centre: Probing PBH and other Macroscopic Dark Matter with LISA
Abstract
A significant fraction of cosmological dark matter can be formed by very dense macroscopic objects, for example primordial black holes. Gravitational waves offer a promising way to probe these kinds of dark-matter candidates, in a parameter space region that is relatively untested by electromagnetic observations. In this work we consider an ensemble of macroscopic dark matter with masses in the range - orbiting a super-massive black hole. While the strain produced by an individual dark-matter particle will be very small, gravitational waves emitted by a large number of such objects will add incoherently and produce a stochastic gravitational-wave background. We show that LISA can be a formidable machine for detecting the stochastic background of such objects orbiting the black hole in the centre of the Milky Way, Sgr\., if a dark-matter spike of the type originally predicted by Gondolo and Silk forms near the central black hole.
Keywords
Cite
@article{arxiv.1811.06387,
title = {Waves from the Centre: Probing PBH and other Macroscopic Dark Matter with LISA},
author = {Florian Kuhnel and Andrew Matas and Glenn D. Starkman and Katherine Freese},
journal= {arXiv preprint arXiv:1811.06387},
year = {2020}
}
Comments
v2: Update to match published version. arXiv admin note: text overlap with arXiv:1705.10361