Constraining neutrino physics with BBN and CMBR

Details Constraining neutrino physics with BBN and CMBR Constraining neutrino physics with BBN and CMBR

2001-05-22

arxiv.org/abs/astro-ph/0105385v2

Phys.Rev. D65 (2002) 023511

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, some reference added

Scientific paper

10.1103/PhysRevD.65.023511

We perform a likelihood analysis of the recent results on the anisotropy of Cosmic Microwave Background Radiation from the BOOMERanG and DASI experiments to show that they single out an effective number of neutrinos in good agreement with standard Big Bang Nucleosynthesis. We also consider degenerate Big Bang Nucleosynthesis to provide new bounds on effective relativistic degrees of freedom $N_\nu$ and, in particular, on neutrino chemical potential $\xi_\alpha$. When including Supernova Ia data we find, at $2\sigma$, $N_\nu \leq 7$ and $-0.01 \leq \xi_e \leq 0.22$, $|\xi_{\mu,\tau}|\leq 2.6$.

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