WIMPs and stellar-mass primordial black holes are incompatible

Adamek, Julian, Byrnes, Christian T, Gosenca, Mateja and Hotchkiss, Shaun (2019) WIMPs and stellar-mass primordial black holes are incompatible. Journal of High Energy Physics, 100 (2). a023506 1-11. ISSN 2470-0010

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We recently showed that postulated ultracompact minihalos with a steep density profile do not form in realistic simulations with enhanced initial perturbations. In this paper we assume that a small fraction of the dark matter consists of primordial black holes (PBHs) and simulate the formation of structures around them. We find that in this scenario halos with steep density profiles do form, consistent with theoretical predictions. If the rest of the dark matter consists of weakly interacting massive particles (WIMPs), we also show that WIMPs in the dense innermost part of halos surrounding the PBH would annihilate and produce a detectable gamma-ray signal. The non-detection of this signal implies that PBHs make up at most one billionth of the dark matter, provided that their mass is greater than one millionth of the mass of the Sun. Similarly, a detection of PBHs would imply that the remaining dark matter could not be WIMPs.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Astronomy Centre
Subjects: Q Science > QB Astronomy
Depositing User: Alice Jackson
Date Deposited: 02 Jul 2019 14:06
Last Modified: 03 Mar 2021 17:15
URI: http://sro.sussex.ac.uk/id/eprint/84700

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Project NameSussex Project NumberFunderFunder Ref
University of Sussex Astronomy Consolidated Grant 2017-2020G2050STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/P000525/1