Gravitational Radiation from Preheating with Many Fields

Understand

Parametric resonances provide a mechanism by which particles can be created just after inflation.

• Thus far, attention has focused on a single or many inflaton fields coupled to a single scalar field.
• However, generically we expect the inflaton to couple to many other relativistic degrees of freedom present in the early universe.
• Using simulations in an expanding Friedmann-Lema\^itre-Robertson-Walker spacetime, in this paper we show how preheating is affected by the addition of multiple fields coupled to the inflaton.