Constraints on Inflation Models from Supersymmetry Breakings

Details Constraints on Inflation Models from Supersymmetry Breakings Constraints on Inflation Models from Supersymmetry Breakings

2001-02-26

arxiv.org/abs/hep-ph/0102314v2

Phys.Lett. B506 (2001) 231-237

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 1 ps figure, minor correction

Scientific paper

10.1016/S0370-2693(01)00412-9

Effects of soft SUSY-breaking terms on inflation potentials are discussed. There exist generic constraints that must be satisfied in order not for the inflaton potential to loose its flatness. We examine explicitly the constraints in the case of a hybrid inflation model and find that the coupling constant \lambda between the inflaton and the ``water-fall-direction'' field is bounded as 2.0 \times 10^{-6} < \lambda. This is a highly non-trivial result. Indeed, if we adopt the severest constraint from avoiding the problem of the gravitinos produced non-thermally, \lambda < 7.4 \times 10^{-6} is required, under a reasonable assumption on the reheating process. This means that the hybrid inflation model marginally has a viable parameter space. We also discuss analogous constraints on other inflation models.

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