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  1. B100 理学部/理学研究科
  2. B100a 雑誌掲載論文
  3. 学術雑誌

Relic abundance in a secluded dark matter scenario with a massive mediator

http://hdl.handle.net/2237/26871
http://hdl.handle.net/2237/26871
7e8ea956-8865-45fd-84db-46527852b194
名前 / ファイル ライセンス アクション
PhysRevD_95_023006.pdf PhysRevD_95_023006.pdf (901.4 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2017-08-02
タイトル
タイトル Relic abundance in a secluded dark matter scenario with a massive mediator
言語 en
著者 Okawa, Shohei

× Okawa, Shohei

WEKO 73046

en Okawa, Shohei

Search repository
Tanabashi, Masaharu

× Tanabashi, Masaharu

WEKO 73047

en Tanabashi, Masaharu

Search repository
Yamanaka, Masato

× Yamanaka, Masato

WEKO 73048

en Yamanaka, Masato

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 © 2017 American Physical Society
抄録
内容記述 The relic abundance of the dark matter (DM) particle d is studied in a secluded DM scenario, in which the d number decreasing process dominantly occurs not through the pair annihilation of d into the standard model particles, but via the dd→mm scattering process with a subsequently decaying mediator particle m. It is pointed out that the cosmologically observed relic abundance of DM can be accomplished even with a massive mediator having a mass mm non-negligibly heavy compared with the DM particle mass md. In the degenerated d−m case (md=mm), the DM relic abundance is realized by adjusting the dd→mm scattering amplitude large enough and by choosing an appropriate mediator particle lifetime. The DM evolution in the early universe exhibits characteristic “terrace” behavior, or two-step number density decreasing behavior, having a “fake” freeze-out at the first step. Based on these observations, a novel possibility of the DM model buildings is introduced in which the mediator particle m is unified with the DM particle d in an approximate dark symmetry multiplet. A pionic DM model is proposed to illustrate this idea in a renormalizable field theory framework.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 American Physical Society
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1103/PhysRevD.95.023006
ISSN
収録物識別子タイプ PISSN
収録物識別子 2470-0010
書誌情報 en : Physical Review D

巻 95, p. 023006-023006, 発行日 2017-01
著者版フラグ
値 publisher
URI
識別子 https://doi.org/10.1103/PhysRevD.95.023006
識別子タイプ DOI
URI
識別子 http://hdl.handle.net/2237/26871
識別子タイプ HDL
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