Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-06-26
Phys.Rev.D79:033007,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 3 figures. References on late time enthropy release included, several points clarified
Scientific paper
10.1103/PhysRevD.79.033007
We 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 particle that can dilute any possible unwanted relic, as the gravitino in supersymmetric models, and thus relax the constraints on the inflationary reheating temperature. Furthermore, a long period of matter domination reduces the number of $e$-foldings after the horizon crossing by observable perturbations and therefore the requirements on flatness of the inflationary potential. A natural candidate for such 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.
Barenboim Gabriela
Vives Oscar
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