Cosmological bounds on neutrino statistics

De Salas, P.F. and Gariazzo, S. and Laveder, M. and Pastor, S. and Pisanti, O. and Truong, Nhut (2018) Cosmological bounds on neutrino statistics. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (3). ISSN 1475-7516

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Abstract

We consider the phenomenological implications of the violation of the Pauli exclusion principle for neutrinos, focusing on cosmological observables such as the spectrum of Cosmic Microwave Background anisotropies, Baryon Acoustic Oscillations and the primordial abundances of light elements. Neutrinos that behave (at least partly) as bosonic particles have a modified equilibrium distribution function that implies a different influence on the evolution of the Universe that, in the case of massive neutrinos, can not be simply parametrized by a change in the effective number of neutrinos. Our results show that, despite the precision of the available cosmological data, only very weak bounds can be obtained on neutrino statistics, disfavouring a more bosonic behaviour at less than 2 sigma.

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