Abstract
We present the evolution of the full set of Einstein equations during preheating after inflation, for a generic supersymmetric model of hybrid inflation. Preheating of the scalar metric fluctuations does affect the evolution of vector and tensor modes, and in particular they do enhance the induced stochastic background of gravitational waves during preheating.This gives an energy density in general an order of magnitude larger than that obtained by evolving the tensors fluctuations in an homogeneous background metric. This enhancement can improve the expectations for detection by planned gravitational waves observatories.
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