Steen Hannestad JCAP02(2005)011 doi:10.1088/1475-7516/2005/02/011
Steen Hannestad
Show affiliationsWe investigate a model where neutrinos are strongly coupled to a new, light scalar field. In this model neutrinos annihilate as soon as they become non-relativistic in the early universe, and a non-zero neutrino mass has a marginal effect on the matter power spectrum. However, the angular power spectrum of the cosmic microwave background (CMB) is changed significantly because the strongly interacting fluid of neutrinos and scalars does not experience any anisotropic stress. Such models are strongly disfavoured by current observations. Interestingly, this leads to the conclusion that the relativistic energy density around the epoch of recombination must be in the form of very weakly interacting particles. This conclusion is independent of the specific interaction model.
E-print Number: astro-ph/0411475
Cited: by |
Refers: to
12.15.Ff Quark and lepton masses and mixing
13.15.+g Neutrino interactions
12.10.Dm Unified theories and models of strong and electroweak interactions
Issue 02 (February 2005)
Received 19 November 2004, accepted for publication 17 January 2005
Published 24 February 2005
Steen Hannestad JCAP02(2005)011
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