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Manifesting hidden dynamics of a sub-component dark matter

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Title
Manifesting hidden dynamics of a sub-component dark matter
Author(s)
Ayuki Kamada; Hee Jung Kim; Park, Jong-Chul; Seodong Shin
Publication Date
2022-10
Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v.2022, no.10
Publisher
IOP Publishing Ltd
Abstract
We emphasize the distinctive cosmological dynamics in multi-component dark -matter scenarios and their impact on probing a sub-dominant component of dark matter. The dynamics originate from the conversion among different dark-matter components. We find that the temperature of the self-interacting sub-component dark matter is significantly enhanced by the dark-matter annihilation into the sub-component. The same annihilation sharply increases the required annihilation cross section for the sub-component as we consider a smaller relative abundance fraction among the dark-matter species. Because of the enhanced temperature and couplings of the sub-component, contrary to a naive expectation, the sub-component with smaller abundance fractions tends to be disfavored by dark-matter direct/indirect-detection experiments and cosmological observations. We demonstrate this by taking a dark photon portal scenario for the sub-component at the sub-GeV mass scale. For the abundance fraction >= 10 %, the enhanced temperature of the sub-component is subject to warm dark matter constraints which are complementary to the parameter space probed by accelerator-based experiments. Smaller abundance fractions tend to be disfavored by accelerator-based experiments due to the enhanced coupling to Standard Model particles.
URI
https://pr.ibs.re.kr/handle/8788114/12634
DOI
10.1088/1475-7516/2022/10/052
ISSN
1475-7516
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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