Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-10-12
Phys.Rev.D77:096007,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 2 figures inc
Scientific paper
10.1103/PhysRevD.77.096007
It was recently found that the decay of inflaton and the SUSY breaking field produces many gravitinos in the gravity mediation scenario. These discoveries led to an exclusion of many inflation models such as chaotic, (smooth) hybrid, topological and new inflation models. Under these circumstances we searched for a successful inflation model and found that the ``inverted'' hybrid inflation models can solve the gravitino overproduction problem by their distinctive shape of the potential. Furthermore, we found that this inflation model simultaneously can explain the observed baryon asymmetry through the non-thermal leptogenesis and is consistent with the WMAP results, that is, $n_s=0.951^{+0.015}_{-0.019}$ and the negligible tensor to scalar ratio.
Nakajima Hiroaki
Shinbara Y.
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