Constraint on the gravitino mass in hybrid inflation

Details Constraint on the gravitino mass in hybrid inflation Constraint on the gravitino mass in hybrid inflation

2010-07-29

arxiv.org/abs/1007.5152v2

JCAP 1012:010,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 5 figures; published version

Scientific paper

10.1088/1475-7516/2010/12/010

We revisit the F-term hybrid inflation model in supergravity. In particular, we point out that a constant term in the superpotential has significant effects on the inflaton dynamics. It is shown that the hybrid inflation model suffers from several potential problems: tuning of the initial condition, gravitino overproduction and formation of cosmic strings, for both minimal and non-minimal Kahler potentials. These problems can only be avoided in gauge-mediated SUSY breaking models where the gravitino is relatively light and the constant term in the superpotential is not important. Implications on the non-thermal leptogenesis scenario are also described.

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