RESUMEN

In this talk we will consider about the early thermal effects on inflaton fluctuations. It is presupposed that there is a thermal begining of inflation where the inflaton fluctuations were thermalised, by some interactions. As inflation started the inflaton fluctuations decoupled from the initial thermal equilibrium with a blue shifted temperature profile. With this assumption we will study the effect of this inflataton temperature on the polarization spectrum of the CMB, specially the B-mode. The effect of the inflaton temperature on the TT-spectrum of the CMB and, what can be inferred about some inflationary models, particularly weak scale inflation and warm inflation.