期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 10, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP10(2013)214
关键词
Cosmology of Theories beyond the SM; Supersymmetric Effective Theories
资金
- Royal Society University Research Fellowship
- European Research Council
- European Commission under the Marie Curie Initial Training Network UNILHC [237920]
Relativistic axions are good candidates for the dark radiation for which there are mounting observational hints. The primordial decays of heavy fields produce axions which are ultra-energetic compared to thermalised matter and inelastic axion-matter scattering can occur with E-CoM >> T-gamma, thus accessing many interesting processes which are otherwise kinematically forbidden in standard cosmology. Axion-photon scattering into quarks and leptons during BBN affects the light element abundances, and bounds on over-production of He-4 constrain a combination of the axion decay constant and the reheating temperature. For supersymmetric models, axion scattering into visible sector superpartners can give direct non-thermal production of dark matter at T-gamma << T-freezeout. Most axions - or any other dark radiation candidate from modulus decay - still linger today as a Cosmic Axion Background with E-axion similar to O(100) eV, and a flux of similar to 10(6) cm(-2)s(-1).
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