  The inflaton must convert its energy into radiation after inflation, which,
in a conventional scenario, is caused by the perturbative inflaton decay. This
reheating process would be much more complicated in some cases: the decay
products obtain masses from an oscillating inflaton and thermal environment,
and hence the conventional reheating scenario can be modified. We study in
detail processes of particle production from the inflaton, their subsequent
thermalization and evolution of inflaton/plasma system by taking dissipation of
the inflaton in a hot plasma into account. It is shown that the reheating
temperature is significantly affected by these effects.
