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Tang, Y; Wu, YL; Tang, Y (reprint author), Univ Tokyo, Fac Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan.
On thermal gravitational contribution to particle production and dark matter
Source PublicationPHYSICS LETTERS B
Language英语
AbstractWe 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.
2017
Volume774Pages:676-681
Subject AreaAstronomy & Astrophysics ; Physics
DOIhttp://dx.doi.org/10.1016/j.physletb.2017.10.034
Funding Organization[16H06490] ; [16H06490] ; [16H06490] ; [16H06490]
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/21936
CollectionSCI期刊论文
Corresponding AuthorTang, Y (reprint author), Univ Tokyo, Fac Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan.
Recommended Citation
GB/T 7714
Tang, Y,Wu, YL,Tang, Y . On thermal gravitational contribution to particle production and dark matter[J]. PHYSICS LETTERS B,2017,774:676-681.
APA Tang, Y,Wu, YL,&Tang, Y .(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.
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