期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/07/015
关键词
leptogenesis; particle physics - cosmology connection; neutrino theory
资金
- Swiss National Science Foundation (SNF) [200020-155935]
- Vaisala Foundation
- Swiss National Science Foundation (SNF) [200020_155935] Funding Source: Swiss National Science Foundation (SNF)
We estimate the thermal masses and damping rates of active (in < eV) and sterile (M similar to CeV) neutrinos with thermal momenta k similar to 3T at temperatures below the electroweak crossover (5 GeV < T < 160 GeV). These quantities fix the equilibration or washout rates of Standard Model lepton number densities. Sterile neutrinos interact via direct scatterings mediated by Yukawa couplings, and via their overlap with active neutrinos. Including all leading-order reactions we find that the washout rate generally exceeds the Hubble rate for 5 GeV < T < 30 GeV. Therefore it is challenging to generate a large lepton asymmetry facilitating dark matter computations operating at T < 5 GeV, whereas the generation of a baryon asymmetry at T > 130 GeV remains an option. Our differential rates are tabulated in a form suitable for studies of specific scenarios with given neutrino Yukawa matrices.
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