Gravitino production in hybrid inflationary models

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  • 1 February 2000
Abstract
It has been recently shown that it is possible to excite gravitinos in an expanding background due to time varying chiral scalar field, oscillating at the bottom of the inflationary potential. The two components namely, helicity 1/2 and helicity 3/2 are excited differently due to the presence of different time varying mass scales in the problem. In this paper we analyse fully the production of both the helicities in multi-chiral scenario, in particular concentrating on hybrid inflation models. Fermion production in hybrid models is discussed and it has been noticed that the creation of gravitinos do not take place in the first few oscillations rather the production is a continuous and delayed process. It takes roughly 30-40 oscillations to build up the production and for the saturation to take place it requires more than that, which is again very sensitive to model parameters. Fermion creation in hybrid model is very much different from the chaotic models discussed so far in literatures. In this paper we give a full account of gravitino production analytically and compare our results numerically. We give an estimation of reheat temperature and discuss upon backreaction on the fermionic production, which could change the gravitino abundance.

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