Gravitational wave production from preheating: parameter dependence

Understand

Parametric resonance is among the most efficient phenomena generating gravitational waves (GWs) in the early Universe.

• The dynamics of parametric resonance, and hence of the GWs, depend exclusively on the resonance parameter $q$.
• The latter is determined by the properties of each scenario: the initial amplitude and potential curvature of the oscillating field, and its coupling to other species.
• Previous works have only studied the GW production for fixed value(s) of $q$.