Some of the inflation models propose a heavy field called waterfall field, other than the inflaton, which decays in a short time during or at the end of inflation. While the inflaton is responsible for course of inflation, this waterfall field which appears in a phase transition state is responsible for different effects. These effects include making features in the power spectrum up to preparing an end to the inflationary stage. This talk studies some of these effects

IPM Larak Building, School of Astronomy