Key points are not available for this paper at this time.
The theory of reheating of the Universe after inflation is developed. We have found that typically at the first stage of reheating the classical inflation field rapidly decays into particles or into other bosons due to a broad parametric resonance. Then these bosons decay into other particles, which eventually become thermalized. Complete reheating is possible only in those theories where a single particle can decay into other particles. This imposes strong constraints on the structure of inflationary models, and implies that the inflation field can be a dark matter candidate.
Kofman et al. (Mon,) studied this question.