Hiding relativistic degrees of freedom in the early universe

Details Hiding relativistic degrees of freedom in the early universe Hiding relativistic degrees of freedom in the early universe

2003-06-06

arxiv.org/abs/hep-ph/0306061v1

Phys.Lett.B569:123-128,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 5 figures

Scientific paper

10.1016/j.physletb.2003.07.039

We quantify the extent to which extra relativistic energy density can be concealed by a neutrino asymmetry without conflicting with the baryon asymmetry measured by the Wilkinson Microwave Anisotropy Probe (WMAP). In the presence of a large electron neutrino asymmetry, slightly more than seven effective neutrinos are allowed by Big Bang Nucleosynthesis (BBN) and WMAP at 2\sigma. The same electron neutrino degeneracy that reconciles the BBN prediction for the primordial helium abundance with the observationally inferred value also reconciles the LSND neutrino with BBN by suppressing its thermalization prior to BBN.

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