Relic neutrino asymmetry, CMB and large-scale structure
High Energy Physics - Phenomenology
2009-10-31 v1
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/9909308,
title = {Relic neutrino asymmetry, CMB and large-scale structure},
author = {Sergio Pastor and Julien Lesgourgues},
journal= {arXiv preprint arXiv:hep-ph/9909308},
year = {2009}
}
Comments
5 pages, 3 figures, to be published in Nucl. Phys. B (Proc. Supp.) as a contribution to the International Workshop on Particles in Astrophysics and Cosmology, Valencia (Spain), May 1999