Constraining neutrino physics with big bang nucleosynthesis and cosmic microwave background radiation

S. H. Hansen, G. Mangano, A. Melchiorri, G. Miele, and O. Pisanti
Phys. Rev. D 65, 023511 – Published 21 December 2001
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Abstract

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 Nν and, in particular, on the neutrino chemical potential ξα. When including supernova type Ia data we find, at 2σ, Nν<~7 and 0.01<~ξe<~0.22, |ξμ,τ|<~2.6.

  • Received 4 June 2001

DOI:https://doi.org/10.1103/PhysRevD.65.023511

©2001 American Physical Society

Authors & Affiliations

S. H. Hansen1, G. Mangano2, A. Melchiorri1, G. Miele2, and O. Pisanti2

  • 1Department of Physics, Nuclear & Astrophysics Laboratory, University of Oxford, Keble Road, Oxford OX1 3RH, United Kingdom
  • 2Dipartimento di Scienze Fisiche, Università “Federico II,” Napoli, and INFN Sezione di Napoli, Complesso Universitario di Monte Sant’Angelo, Via Cintia, 80126 Napoli, Italy

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Vol. 65, Iss. 2 — 15 January 2002

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