Erschienen:
Springer Science and Business Media LLC, 2020
Erschienen in:
The European Physical Journal C, 80 (2020) 7
Sprache:
Englisch
DOI:
10.1140/epjc/s10052-020-8183-4
ISSN:
1434-6044;
1434-6052
Entstehung:
Anmerkungen:
Beschreibung:
AbstractA 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 $$10^{-13}$$10-13–$$1\ M_{\odot }$$1M⊙ 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 $$\mathrm{A}^{\!*}$$A∗, if a dark-matter spike of the type originally predicted by Gondolo and Silk forms near the central black hole.