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(Standard model) universe dominated by the right matter

AuthorsBarenboim, Gabriela ; Vives, Óscar
KeywordsTime Entropy Production
Neutrino Mass
Inflationary Universe
Decaying Particles
Issue Date4-Feb-2009
AbstractWe analyze the phenomenology of a prolonged early epoch of matter domination by an unstable but very long-lived massive particle. This new matter domination era can help to relax some of the requirements on the primordial inflation. Its main effect is the huge entropy production produced by the decays of such a particle that can dilute any possible unwanted relic, as the gravitino in supersymmetric models, and thus relax the constraints on the inflationary reheating temperature. A natural candidate for such a heavy, long-lived particle already present in the standard model of the electroweak interactions would be a heavy right-handed neutrino. In this case, we show that its decays can also generate the observed baryon asymmetry with right-handed neutrino masses well above the bound from gravitino overproduction.
Description14 pages, 3 figures. References on late time enthropy release included, several points clarified. PACS numbers: 14.60.Pq, 98.80.Cq. ArXiv pre-print available at http://arxiv.org/abs/0806.4389
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.79.03307
Appears in Collections:(IFIC) Artículos
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