Lev Kofman co-developed models of energy transfer after cosmic inflation, including particle production amplified by an oscillating inflaton. The reheating analysis treats effects beyond a purely perturbative decay calculation, with parametric resonance and the response of the produced particles changing the subsequent evolution.[ref]
Towards the Theory of Reheating After Inflation by Lev Kofman and others. Abstract: resonant particle production, expansion and backreaction
The physical lesson is that ending accelerated expansion does not by itself establish a thermal universe. One must explain how energy moves into other degrees of freedom and how the resulting distribution evolves.
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