Gravitino production during preheating

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We study the production of gravitinos during the preheating era after inflation by means of the non-perturbative Bogolyubov technique. Considering only the helicity ±3/2 states, the problem is reduced to the simpler Dirac fermions case. We calculate the production in a particular supergravity model in an expanding universe and obtain the spectrum and number density. Finally we compare the results with the nucleosynthesis bounds and extract some consequences.
International Workshop on Particles in Astrophysics and Cosmology (1999. Valencia). © 2014 Elsevier B.V. I thank A. Mazumdar for useful discussions. This work has been supported by SEUID-Royal Society and CICYT-AEN97-1693 (Spain).
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