Neutrinos in the early universe |
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| Authors: | D Kirilova J-M Frere |
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| Institution: | 1. Institute of Astronomy, BAS, Sofia, Bulgaria;2. Physique Théorique, Université Libre de Bruxelles, Brussels, Belgium;1. Brookhaven National Laboratory, Upton, NY 11973, United States;2. University of California - Los Angeles, Physics Department, Los Angeles, CA 90095-1547, United States;1. Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA;2. Department of Physics and Astronomy, University of Manitoba, Winnipeg, Canada R3T 2N2;1. Department of Physics, 1156 High St., University of California Santa Cruz, Santa Cruz, CA 95064, USA;2. Santa Cruz Institute for Particle Physics, 1156 High St., Santa Cruz, CA 95064, USA;1. The Niels Bohr Institute, Copenhagen University, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark;2. Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radbaud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands;3. Institute of Physics, Jagiellonian University, Lojasiewicza 11, 30-348 Krakow, Poland;1. Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P 5C2, Canada;2. Perimeter Institute for Theoretical Physics, Waterloo, ON N2J 2W9, Canada;3. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA |
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| Abstract: | The neutrinos from the Big Bang or the Cosmic Neutrino Background (CNB) carry precious information from the early epoch when our universe was only 1 s old. Although not yet directly detected, CNB may be revealed indirectly through cosmological observations due to neutrino important cosmological influence.We review the cosmological role of neutrinos and the cosmological constraints on neutrino characteristics. Namely, we discuss the impact of neutrinos in the early universe: the cosmic expansion, neutrino decoupling, the role of neutrinos in the primordial production of light elements, leptogenesis, etc. We briefly discuss the role of neutrino at later stages of the universe.Due to the considerable cosmological influence of neutrinos, cosmological bounds on neutrino properties from observational data exist. We review the cosmological constraints on the effective number of neutrino species, neutrino mass and mixing parameters, lepton number of the universe, presence of sterile neutrino, etc. |
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