Seminaire astro/cosmo : Preheating after inflation and gravity waves production par Mar Bastero-Gil

Thursday 5 Jul 2012, 11:00 → 12:00 Europe/Paris

Universe

We discuss the evolution of the coupled system field-gravity during "preheating" after inflation, obtained by integrating the full set of Einstein equations with matter sources provided by the inflaton field and fields coupled to it. Parametric amplification of field fluctuations after inflation may lead to the production of a stochastic background of gravity waves, within the possible reach of future gravity wave experiments. Current studies are carried out without taking into account the effect of the expansion rate during preheating, and taking into account only the system field-tensor perturbations. However, preliminary results obtained when including during preheating all kind of metric perturbations show a tendency to increase the value of the amplitude of the primordial gravitational waves.