Cosmological implications of a Relic Neutrino Asymmetry

Details Cosmological implications of a Relic Neutrino Asymmetry Cosmological implications of a Relic Neutrino Asymmetry

1999-04-20

arxiv.org/abs/hep-ph/9904411v2

Phys.Rev. D60 (1999) 103521

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 5 figures, minor changes, version accepted in PRD

Scientific paper

10.1103/PhysRevD.60.103521

We consider some consequences of the presence of a cosmological lepton asymmetry in the form of neutrinos. 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 neutrino degeneracy and on the spectral index in the case of a flat Universe with a cosmological constant.

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