Particles and gravitons creation after inflation from a 5D vacuum
  We use the Bogoliubov formalism to study both, particles and gravitons creation at the reheating epoch, after a phase transition from inflation to a radiation dominated universe. The modes of the inflaton field fluctuations and the scalar fluctuations of the metric at the end of inflation are obtained by using a recently introduced formalism related to the Induced Matter theory of gravity. The interesting result is that the number of created particles is bigger than $10^{90}$ on cosmological scales. Furthermore, the number of gravitons are nearly $10^{-17}$ times smaller than the number of created particles. In both cases, these numbers rapidly increases on cosmological scales. 
Mariano Anabitarte, Mauricio Bellini (Mar del Plata University, IFIMAR   - CONICET)
gr-qc astro-ph.CO hep-ph hep-th