Relic neutrino asymmetry, CMB and large-scale structure

Details Relic neutrino asymmetry, CMB and large-scale structure Relic neutrino asymmetry, CMB and large-scale structure

1999-09-09

arxiv.org/abs/hep-ph/9909308v1

Nucl.Phys.Proc.Suppl. 81 (2000) 47-51

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures, to be published in Nucl. Phys. B (Proc. Supp.) as a contribution to the International Workshop on Particle

Scientific paper

10.1016/S0920-5632(99)00857-9

We consider some consequences of the presence of a cosmological lepton asymmetry in the form of neutrinos. A relic neutrino degeneracy enhances the contribution of massive neutrinos to the present energy density of the Universe, and modifies the power spectrum of radiation and matter. Comparing with current observations of cosmic microwave background anisotropies and large scale structure, we derive some constraints on the relic neutrino degeneracy and on the spectral index in the case of a flat Universe with a cosmological constant.

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