  The time dependence of the temperature during the reheating process is
studied. We consider the thermal feedback effects of the produced particles on
the effective dissipation rate of the inflaton field, which can lead to
enhanced production of particles. We parameterize the temperature dependence of
the dissipation rate in terms of a Taylor expansion containing the vacuum decay
rate and the thermal terms. By solving the Boltzmann equations for the energy
densities of the inflaton and radiation, we provide analytic estimates for a
general power law dependence on the temperature. We also study the maximum
temperature of the reheating process in different cases.
