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Novel constraints on mixed dark-matter scenarios of primordial black holes and WIMPs
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Nordic Institute for Theoretical Physics (Nordita).ORCID iD: 0000-0001-7958-8940
Number of Authors: 42018 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 7, article id 003Article in journal (Refereed) Published
Abstract [en]

We derive constraints on mixed dark-matter scenarios consisting of primordial black holes (PBHs) and weakly interacting massive particles (WIMPs). In these scenarios, we expect a density spike of the WIMPs that are gravitationally bound to the PBHs, which results in an enhanced annihilation rate and increased indirect detection prospects. We show that such scenarios provide strong constraints on the allowed fraction of PBHs that constitutes the dark matter, depending on the WIMP mass m(x) and the velocity-averaged annihilation cross-section <sigma v >. For the standard scenario with m(x) = 100 GeV and <sigma v > = 3 x 10(-26) cm(3)/s, we derive bounds that are stronger than all existing bounds for PBHs with masses 10(-12) M-circle dot less than or similar to M-BH less than or similar to 10(4) where M-circle dot, is the solar mass, and mostly so by several orders of magnitude.

Place, publisher, year, edition, pages
2018. no 7, article id 003
Keywords [en]
dark matter theory, primordial black holes
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-158357DOI: 10.1088/1475-7516/2018/07/003ISI: 000437299100003OAI: oai:DiVA.org:su-158357DiVA, id: diva2:1238428
Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2020-03-05Bibliographically approved

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Visinelli, Luca
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)Nordic Institute for Theoretical Physics (Nordita)
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