  The conventional background solution for the evolution of a single canonical
inflaton field performs admirably in extreme scenarios such as the slow-roll
phase (where the slow-roll parameter is much less than one) and the deep
reheating era (where the Hubble parameter is much smaller than the effective
mass of the potential and the field oscillates around the minimum of the
potential), but fails to accurately depict the dynamics of the Universe around
the end of inflation and the initial oscillatory phases. This article proposes
a single, unified, model-independent, parametrized analytical solution for such
models that bridges the gap between these two extremes, providing a
near-accurate comprehensive description of the evolution of the Universe. This
novel strategy has the potential to substantially enhance both quantitative and
qualitative cosmological observational predictions, and, as a consequence, can
further constrain the inflationary models more effectively using future
observations.
