Freeze-in from preheating

Abstract We consider the production of dark matter during process reheating after inflation. The relic density from freeze-in depends on both energy and distribution inflaton scattering or decay products composing radiation bath. compare perturbative non-perturbative calculations in radiation. also (likely) possibility that final state scalar are unstable. Assuming either thermal non-thermal functions, we resulting based these different approaches. show present-day cold can be obtained through preheating for a large range masses.