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Abstract:
In this thesis, we first study how classical fields can be quantized on a curved
spacetime. Interestingly, this provides a mechanism for purely gravitational
particle production which we investigate against the background of scalar
fields in the FLRW spacetime. Subsequently, this mechanism is used to produce
DM particles at the end of inflation and during reheating which therefore
will not interact with other particles except gravitatively. Finally, we disduss
on a general ground how to construct models which describe purely gravitatively
interacting particles.
