Gravitational particle creation for dark matter and reheating

The purely gravitational dark matter (PGDM) which interacts with the standard model particles only by gravitational interaction is a topic of recent discussion. Due to its feeble interaction, PGDM may be produced mainly by the gravitational particle creation, which plays an important role in the reheating after kinetically driven inflation and in some potential-driven inflation without a subsequent inflaton oscillating phase. Therefore, we consider the possibility of the gravitational reheating model which can simultaneously explain the present PGDM density. We consider a model where two massive scalar fields are incorporated into the standard model in addition to the inflation sector. We show that the gravitational particle creation prevails over the thermal creation-the freeze-in process-and it can actually explain the reheating and the present abundance of dark matter if one of the scalar particles is as heavy as the Hubble parameter during inflation similar to 10(13) GeV and finally decays into radiation via sufficiently weak coupling and the other is a stable PGDM with mass of the order of 10(3) GeV.