2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42844We consider the possibility of regarding the maximum temperature $\tm$ of a plasma of inflaton decay products as a Hagedorn temperature connected with the transition from an inflaton-dominated epoch to a radiation-dominated universe. Employing a ``bottom-up'' approach to inflaton decay, we show that the limiting temperature $T_{\rm H}\sim m_ϕ$, as obtained from a numerical analysis of the evolution equations, can also be understood theoretically in a Hagedorn picture of the phase transition.4 pages, 1 figure, one refernce added and typos correctedHigh Energy Physics - PhenomenologyAstrophysicstext