Speaker
Sergio Pastor
(IFIC, CSIC-Univ Valencia, Spain)
Description
In the 3+1 neutrino scheme with an additional state, we consider the thermalisation of neutrinos in the early Universe in the so-called very low reheating scenarios. This process could be incomplete due to the lack of interactions, leading to a reduced contribution of neutrinos to the cosmological energy density of radiation. We calculate this contribution, usually measured in terms of the parameter $N_{\rm eff}$, taking into account the full $4\times 4$ neutrino mixing matrix. We find the corresponding bounds from cosmological data on the $3+1$ neutrino scenario (neutrino squared mass differences and mixings) as a function of the reheating temperature $T_{\rm RH}$.
| Submitted on behalf of a Collaboration? | No |
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Author
Sergio Pastor
(IFIC, CSIC-Univ Valencia, Spain)
