Geometrical origin of entropy during inflation from the STM theory of   gravity
  Using a recently introduced 5D Riemann flat metric, we investigate the possibility of introducing dissipation in the dynamics of the inflaton field on an effective 4D FRW metric, in the framework of the STM theory of gravity. 
Jesus Romero (Mar del Plata University), Mauricio Bellini (Mar del   Plata University, CONICET)