The Case for a Neutrino-Degenerate Universe

Details The Case for a Neutrino-Degenerate Universe The Case for a Neutrino-Degenerate Universe

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.3409m&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #34.09; Bulletin of the American Astronomical Society, Vol. 33, p.1358

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We reanalyze the cosmological constraints on the existence of a net universal lepton asymmetry and neutrino degeneracy based upon the latest high resolution CMB sky maps from BOOMERANG, DASI, and MAXIMA-1. We compute likelihood functions for flat cosmological models with and without degenerate neutrinos. We adopt priors on the degeneracy parameters and baryon content based upon light-element constraints on primordial nucleosynthesis. We also adopt the prior of h = 0.72 +/- 0.08 from the Hubble Key Project results. Our neutrino-degenerate CMB models include a correction for that change in neutrino decoupling temperature with degeneracy. The marginalized likelihood functions show a slight preference for a neutrino-degenerate universe.

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