Cosmology of neutrinos and extra-light particles after WMAP3

被引：51

作者：

Cirelli, Marco ^{[1
]}

Strumia, Alessandro

机构：

[1] Yale Univ, Dept Phys, New Haven, CT 06520 USA

[2] Univ Pisa, Dipartimento Fis, I-56100 Pisa, Italy

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2006年 / 12期

关键词：

cosmological neutrinos; neutrino properties; cosmology of theories beyond the SM;

D O I：

10.1088/1475-7516/2006/12/013

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study how present data probe standard and non-standard properties of neutrinos and the possible existence of new light particles, freely streaming or interacting, among themselves or with neutrinos. Our results include: Sigma m(nu) < 0.40 eV at 99.9% C.L.; that extra massless particles have abundance Delta N-nu = 2 +/- 1 if freely streaming and Delta N-nu = 0 +/- 1.3 if interacting; that three interacting neutrinos are disfavoured at about 4 sigma. We investigate the robustness of our results by fitting different subsets of data. We developed our own cosmological computational tools, somewhat different from the standard ones.

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