Waves from the Centre: Probing PBH and other Macroscopic Dark Matter with LISA. (arXiv:1811.06387v2 [gr-qc] UPDATED)
<a href="http://arxiv.org/find/gr-qc/1/au:+Kuhnel_F/0/1/0/all/0/1">Florian Kuhnel</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Matas_A/0/1/0/all/0/1">Andrew Matas</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Starkman_G/0/1/0/all/0/1">Glenn D. Starkman</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Freese_K/0/1/0/all/0/1">Katherine Freese</a>

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 $10^{-13}$ – $1,M_{odot}$ 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.${rm A}^{!*}$, if a dark-matter spike of the type
originally predicted by Gondolo and Silk forms near the central black hole.

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 $10^{-13}$ – $1,M_{odot}$ 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.${rm A}^{!*}$, if a dark-matter spike of the type
originally predicted by Gondolo and Silk forms near the central black hole.

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