Non-linear metric perturbation enhancement of primordial gravitational waves

Understand

We present the evolution of the full set of Einstein equations during preheating after inflation.

• We study a generic supersymmetric model of hybrid inflation, integrating fields and metric fluctuations in a 3-dimensional lattice.
• We take initial conditions consistent with Eintein's constraint equations.
• The induced preheating of the metric fluctuations is not large enough to backreact onto the fields, but preheating of the scalar modes does affect the evolution of vector and tensor modes.