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题名: On thermal gravitational contribution to particle production and dark matter
作者: Tang, Y ;  Wu, YL
刊名: PHYSICS LETTERS B
出版日期: 2017
卷号: 774, 页码:676-681
学科分类: Astronomy & Astrophysics; Physics
DOI: http://dx.doi.org/10.1016/j.physletb.2017.10.034
通讯作者: Tang, Y (reprint author), Univ Tokyo, Fac Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan.
文章类型: Article
英文摘要: We investigate the particle production from thermal gravitational annihilation in the very early universe, which is an important contribution for particles that might not be in thermal equilibrium or/and might only have gravitational interaction, such as dark matter (DM). For particles with spin 0,1/2 and 1 we calculate the relevant cross sections through gravitational annihilation and give the analytic formulas with full mass-dependent terms. We find that DM with mass between TeV and 10(16) GeV could have the relic abundance that fits the observation, with small dependence on its spin. We also discuss the effects of gravitational annihilation from inflatons. Interestingly, contributions from inflatons could be dominant and have the same power dependence on Hubble parameter of inflation as that from vacuum fluctuation. Also, fermion production from inflaton, in comparison to boson, is suppressed by its mass due to helicity selection. (c) 2017 The Author(s). Published by Elsevier B.V.
类目[WOS]: Astronomy & Astrophysics ;  Physics, Nuclear ;  Physics, Particles & Fields
关键词[WOS]: INFLATION ;  CONSTRAINTS ;  CANDIDATES ;  CREATION
项目资助者: [16H06490]
语种: 英语
WOS记录号: WOS:000414973200090
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21936
Appears in Collections:理论物理所2017年知识产出_期刊论文

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Tang, Y,Wu, YL. On thermal gravitational contribution to particle production and dark matter[J]. PHYSICS LETTERS B,2017,774:676-681.
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