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21 cm forest probes on axion dark matter in postinflationary Peccei-Quinn symmetry breaking scenarios

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Title
21 cm forest probes on axion dark matter in postinflationary Peccei-Quinn symmetry breaking scenarios
Author(s)
Hayato Shimabukuro; Kiyotomo Ichiki; Kenji Kadota
Subject
DENSITY PROFILE, ; GALAXIES, ; TEMPERATURE, ; SUPPRESSION, ; TOMOGRAPHY, ; ABSORPTION, ; COSMOLOGY, ; CLUSTERS, ; UNIVERSE
Publication Date
2020-07
Journal
PHYSICAL REVIEW D, v.102, no.2, pp.023522
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 American Physical Society. We study the future prospects of the 21 cm forest observations on the axionlike dark matter when the spontaneous breaking of global Peccei-Quinn (PQ) symmetry occurs after the inflation. The large isocurvature perturbations of order unity sourced from axionlike particles can result in the enhancement of minihalo formation, and the subsequent hierarchical structure formation can affect the minihalo abundance whose masses can exceed O(104) M relevant for the 21 cm forest observations. We show that the 21 cm forest observations are capable of probing the axionlike particle mass in the range 10-18 ma 10-12 eV for the temperature independent axion mass. For the temperature dependent axion mass, the zero temperature axion mass scale for which the 21 cm forest measurements can be affected is extended further to as big as of order 10-6 eV
URI
https://pr.ibs.re.kr/handle/8788114/7755
DOI
10.1103/PhysRevD.102.023522
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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