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Different well-know ways to reheat the universe such as instant preheating,the creation of particles nearly or conformally coupled with gravity, or fromthe decay products of a curvaton field, are revisited and discussed in detailin the framework of quintessence inflation, where the inflaton field at the endof inflation, instead to oscillate, rolls monotonically towards the infinite todrive the universe to a kination regime. For any kind of these preheating(particle creation) mechanisms, in order to calculate the reheatingtemperature, we point out the importance of the Big Bang Nucleosynthesis boundsand the decay process of the massive fields involved in the theory, whose decayproducts form a relativistic plasma whose energy density eventually willdominate the one of the background after the phase transition.

Different reheating mechanisms in quintessence inflation