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arXiv · 2110.09988

Cosmological radiation density with non-standard neutrino-electron interactions

Pablo Martínez-Miravé
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Abstract

Non-standard interactions (NSI) between neutrinos and electrons can significantly modify the decoupling of neutrinos from the plasma. These interactions have two effects on the overall picture: (i) they alter neutrino oscillations though matter effects and (ii) they modify the scattering and annihilation processes involving neutrinos and electrons and positrons. We study the role of non-universal and flavour-changing NSI in the decoupling and how they impact the determination of the effective number of neutrinos, $N_{eff}$. We examine the degeneracies between NSI parameters and we compare the expected sensitivity from future cosmological surveys with the current limits from terrestrial experiments. We outline the complementarity between both approaches.

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Pablo Martínez-Miravé. 2021-10-19. Cosmological radiation density with non-standard neutrino-electron interactions. https://doi.org/10.1088/1742-6596%2F2156%2F1%2F012011

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