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Kunio Kaneta
순수물리이론 연구단
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Dark photon relic dark matter production through the dark axion portal

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Title
Dark photon relic dark matter production through the dark axion portal
Author(s)
Kunio Kaneta; Hye-Sung Lee; Seokhoon Yun
Publication Date
2017-06
Journal
PHYSICAL REVIEW D, v.95, no.11, pp.115032 -
Publisher
American Physical Society
Abstract
We present a new mechanism to produce the dark photon (γ′) in the early Universe with the help of the axion (a) using a recently proposed dark axion portal. The dark photon, a light gauge boson in the dark sector, can be relic dark matter if its lifetime is long enough. The main process we consider is a variant of the Primakoff process fa→fγ′ mediated by a photon, which is possible with the axion-photon-dark photon coupling. The axion is thermalized in the early Universe because of the strong interaction and it can contribute to the nonthermal dark photon production through the dark axion portal coupling. It provides a two-component dark matter sector, and the relic density deficit issue of the axion dark matter can be addressed by the compensation with the dark photon. The dark photon dark matter can also address the reported 3.5 keV x-ray excess via the γ′→γa decay. © 2017 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/3676
DOI
10.1103/PhysRevD.95.115032
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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Dark photon relic dark matter production through the dark axion portal_이혜성, 윤석훈, 쿠니오.pdfDownload

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