PoS - Proceedings of Science
Volume 441 - XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP2023) - Cosmology and Particle Physics
Bounds on 3+1 active-sterile neutrino oscillations in very low reheating scenarios
S. Pastor
Full text: pdf
Pre-published on: January 10, 2024
Published on: March 22, 2024
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 effective number of neutrino species ($N_{\rm eff}$), taking into account the full $4\times 4$ neutrino mixing matrix, as a function of the reheating temperature $T_{\rm rh}$.
DOI: https://doi.org/10.22323/1.441.0012
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