Relic neutrino decoupling including flavour oscillations

被引:604
作者
Mangano, G
Miele, G
Pastor, S
Pinto, T
Pisanti, O
Serpico, PD
机构
[1] Univ Politecn Valencia, CSIC, Inst Fis Corpuscular, Int Invest, E-46071 Valencia, Spain
[2] Univ Naples Federico II, Dipartimento Sci Fisiche, I-80126 Naples, Italy
[3] Univ Naples Federico II, INFN, Sez Napoli, I-80126 Naples, Italy
[4] Complesso Univ Monte S Angelo, I-80126 Naples, Italy
[5] Syracuse Univ, Dept Phys, Syracuse, NY 13244 USA
[6] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany
关键词
early universe; neutrinos; non-equilibrium kinetics;
D O I
10.1016/j.nuclphysb.2005.09.041
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
In the early universe, neutrinos are slightly coupled when electron-positron pairs annihilate transferring their entropy to photons. This process originates non-thermal distortions on the neutrino spectra which depend on neutrino flavour, larger for v(e) than for v(mu) or v(tau). We study the effect of three-neutrino flavour oscillations on the process of neutrino decoupling by solving the momentum-dependent kinetic equations for the neutrino spectra. We find that oscillations do not essentially modify the total change in the neutrino energy density, giving N-eff = 3.046 in terms of the effective number of neutrinos, while the small effect over the production of primordial He-4 is increased by O(20%), up to 2.1 x 10(-4). These results are stable within the presently favoured region of neutrino mixing parameters. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:221 / 234
页数:14
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