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Kamada, Ayuki
순수물리이론 연구단
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Escalating core formation with dark matter self-heating

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Title
Escalating core formation with dark matter self-heating
Author(s)
Ayuki Kamada; Hee Jung Kim
Subject
:DENSITY PROFILE, ; HALOES, ; EVOLUTION, ; GALAXIES, ; CLUSTERS
Publication Date
2020-08
Journal
PHYSICAL REVIEW D, v.102, no.4, pp.043009
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 American Physical Society. Exothermic scatterings of dark matter (DM) produce DM particles with significant kick velocities inside DM halos. In collaboration with DM self-interaction, the excess kinetic energy of the produced DM particles is distributed to the others, which self-heats the DM particles as a whole. The DM self-heating is efficient towards the halo center, and the heat injection is used to enhance the formation of a uniform density core inside halos. The effect of DM self-heating is expected to be more significant in smaller halos for two reasons: 1) the exothermic cross section times the relative velocity, , is constant; 2) and the ratio of the injected heat to the velocity dispersion squared gets larger toward smaller-size halos. For the first time, we quantitatively investigate the core formation from DM self-heating for halos in a wide mass range (10(9)-10(15) M-circle dot) using the gravothermal fluid formalism. Notably, we demonstrate that the core formation is sharply escalating toward smaller-size halos by taking the self-heating DM (i.e., DM that semiannihilates and self-interacts) as an example. We show that the sharp escalation of the core formation may cause a tension in simultaneously explaining the observed central mass deficit of Milky Way satellites and field dwarf/low surface brightness spiral galaxies. We expect DM self-heating to be present also in other models that exhibit exothermic scatterings and self-interaction of DM, which can appreciably contribute to the core formation of DM halos
URI
https://pr.ibs.re.kr/handle/8788114/7683
DOI
10.1103/PhysRevD.102.043009
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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