Coupled fields in external background with application to nonthermal production of gravitinos

Details Coupled fields in external background with application to nonthermal production of gravitinos Coupled fields in external background with application to nonthermal production of gravitinos

2001-03-23

arxiv.org/abs/hep-th/0103202v3

JHEP 0104 (2001) 004

Physics

High Energy Physics

High Energy Physics - Theory

Final version; 40 pages, 8 figures

Scientific paper

10.1088/1126-6708/2001/04/004

We provide the formalism for the quantization of systems of coupled bosonic and fermionic fields in a time dependent classical background. The occupation numbers of the particle eigenstates can be clearly defined and computed, through a generalization of the standard procedure valid for a single field in which Bogolyubov coefficients are employed. We apply our formalism to the problem of nonthermal gravitino production in a two-fields model where supersymmetry is broken gravitationally in the vacuum. Our explicit calculations show that this production is strongly suppressed in the model considered, due to the weak coupling between the sector which drives inflation and the one responsible for supersymmetry breakdown.

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