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Kadota, Kenji
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Constraining mixed dark-matter scenarios of WIMPs and primordial black holes from CMB and 21-cm observations

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Title
Constraining mixed dark-matter scenarios of WIMPs and primordial black holes from CMB and 21-cm observations
Author(s)
Hiroyuki Tashiro; Kenji Kadota
Publication Date
2021-06
Journal
Physical Review D, v.103, no.12
Publisher
American Physical Society
Abstract
© 2021 American Physical Society. All rights reserved.We consider the dark-matter (DM) scenarios consisting of the mixture of weakly interacting massive particles (WIMPs) and primordial black holes (PBHs) and study what fraction of the total DM can be PBHs. In such scenarios, PBHs can accrete the WIMPs and consequently enhance the heating and ionization in the intergalactic medium due to WIMP annihilations. We demonstrate that the CMB data can give stringent bounds on the allowed PBH fraction which are comparable to or even tighter than those from the gamma-ray data depending on the DM masses. For instance, the Markov-chain Monte Carlo likelihood analysis using the Planck CMB data leads to a bound on the PBH DM fraction with respect to the total dark matter fPBH≲O(10-10∼10-8) for the WIMP mass mχ∼O(10∼103) GeV with the conventional DM annihilation cross section ⟨σv
URI
https://pr.ibs.re.kr/handle/8788114/9948
DOI
10.1103/PhysRevD.103.123532
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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