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Thermalisation of sterile neutrinos in the early universe in the 3+1 scheme with full mixing matrix
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Number of Authors: 32019 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 7, article id 014Article in journal (Refereed) Published
Abstract [en]

In the framework of a 3+1 scheme with an additional inert state, we consider the thermalisation of sterile neutrinos in the early Universe taking into account the full 4 x 4 mixing matrix. The evolution of the neutrino energy distributions is found solving the momentum-dependent kinetic equations with full diagonal collision terms, as in previous analyses of flavour neutrino decoupling in the standard case. The degree of thermalisation of the sterile state is shown in terms of the effective number of neutrinos, N-eff, and its dependence on the three additional mixing angles (theta(14), theta(24), theta(34)) and on the squared mass difference Delta m(41)(2) is discussed. Our results are relevant for fixing the contribution of a fourth light neutrino species to the cosmological energy density, whose value is very well constrained by the final Planck analysis. For the preferred region of active-sterile mixing parameters from short-baseline neutrino experiments, we find that the fourth state is fully thermalised (N-eff similar or equal to 4).

Place, publisher, year, edition, pages
2019. no 7, article id 014
Keywords [en]
cosmological neutrinos, neutrino properties, particle physics - cosmology connection, physics of the early universe
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-172016DOI: 10.1088/1475-7516/2019/07/014ISI: 000474782100001OAI: oai:DiVA.org:su-172016DiVA, id: diva2:1346660
Available from: 2019-08-28 Created: 2019-08-28 Last updated: 2019-08-28Bibliographically approved

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de Salas, Pablo FernándezPastor, S.
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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