On thermal gravitational contribution to particle production and dark matter

doi:http://dx.doi.org/10.1016/j.physletb.2017.10.034

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	On thermal gravitational contribution to particle production and dark matter
	Tang, Y (reprint author), Univ Tokyo, Fac Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan.; Tang, Y; Wu, YL
刊名	PHYSICS LETTERS B
	2017
卷号	774 页码:676-681
DOI	http://dx.doi.org/10.1016/j.physletb.2017.10.034
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.
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
WOS记录号	WOS:000414973200090
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/21936]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Tang, Y (reprint author), Univ Tokyo, Fac Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan.
推荐引用方式 GB/T 7714	Tang, Y ,Tang, Y,Wu, YL. On thermal gravitational contribution to particle production and dark matter[J]. PHYSICS LETTERS B,2017,774:676-681.
APA	Tang, Y ,Tang, Y,&Wu, YL.(2017).On thermal gravitational contribution to particle production and dark matter.PHYSICS LETTERS B,774,676-681.
MLA	Tang, Y ,et al."On thermal gravitational contribution to particle production and dark matter".PHYSICS LETTERS B 774(2017):676-681.