Journal of High Energy Physics

, 2013:214 | Cite as

The cosmophenomenology of axionic dark radiation



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 CoMT γ , 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 4He 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 γ T freezeout. Most axions — or any other dark radiation candidate from modulus decay — still linger today as a Cosmic Axion Background with E axion ~ \( \mathcal{O} \)(100) eV, and a flux of ~ 106 cm−2 s−1.


Cosmology of Theories beyond the SM Supersymmetric Effective Theories 


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Copyright information

© SISSA, Trieste, Italy 2013

Authors and Affiliations

  1. 1.Rudolf Peierls Center for Theoretical PhysicsOxfordU.K.

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