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Kadota, Kenji
순수물리이론 연구단
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Boosting small-scale structure via primordial black holes and implications for sub-GeV dark matter annihilation

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Title
Boosting small-scale structure via primordial black holes and implications for sub-GeV dark matter annihilation
Author(s)
Kenji Kadota; Joseph Silk
Publication Date
2021-02
Journal
PHYSICAL REVIEW D, v.103, no.4, pp.043530-1 - 043530-11
Publisher
AMER PHYSICAL SOC
Abstract
© 2021 American Physical Society We explore the possibility that the annihilation of dark matter (DM) is boosted due to enhanced substructure in the presence of primordial black holes (PBHs) which constitute a subcomponent of DM. The PBHs can generate entropy fluctuations at the small scales which trigger early structure formation, and a large fraction of the whole DM can reside in these collapsed objects that formed at high redshift (z greater than or similar to 100). Such early forming minihalos consequently possess higher densities than those in the conventional scenarios (without PBHs) and would be more resilient to tidal disruptions. Our scenarios of the annihilation boost due to DM substructures are of particular interest for light (<1 GeV) DM which has been less explored compared to heavier DM in the presence of the PBHs.
URI
https://pr.ibs.re.kr/handle/8788114/9536
DOI
10.1103/PhysRevD.103.043530
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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