  A scenario of the inflaton evolution from cosmic inflation and matter
creation to dark matter/dark energy today is presented. To start with, a model
of the inflationary phase of the inflaton is introduced. The inflaton rolls
down a hilltop potential along with matter creation being dragged down by the
presence of matter. Presence of matter provides a mechanism to stop universe's
acceleration and hence the inflationary phase. The model predictions for the
standard metrics are fully consistent with the current CMB limits. The
potential could in principle be extended to complete a potential hill
subsequent to inflation. The evolution of the inflaton from the inflationary
phase to radiation/matter dominated eras and to current times can be inferred
qualitatively following the evolution of its equation of state parameter.
Existence of solutions to its dynamics, tracking matter as it evolves to
current times, provides a plausible reasoning for the relative order of
magnitudes of the cosmological parameters, in particular to the relative
abundance of dark matter today.
