Description
In this talk I wall show recent results on the gravitational wave spectra that are generated during perturbative reheating.Within a concrete inflationary framework, we derive how the thermodynamic parameters governing the phase transition depend on the effective equation-of-state parameter, which is in turn determined by the inlaton potential. We show that phase transitions occurring during reheating generically produce gravitational wave signals that are suppressed compared to the conventional radiation dominated scenario. The degree of suppression and spectral features depend qualitatively on whether reheating proceeds through fermionic or bosonic channels, with bosonic reheating exhibiting stronger suppression.
