Description
Our present understanding of the reheating phase is incomplete due to a
lack of observations. Apart from its cosmological implications, the reheating should
play a vital role in particle physics and inflation model building. Conventionally
reheating dynamics are modeled by invoking arbitrary coupling among the inflaton
and daughter fields. Such an approach lacks robust cosmological predictions due
to its arbitrary couplings and is difficult to verify through observation. In this talk, we
discuss reheating scenario where the inflaton is coupled with all the daughter fields
only gravitationally. Besides being successful in reheating the Universe, the
scenario offers a strong cosmological prediction of the primordial gravitational
wave spectrum and rich dark matter phenomenology.
