Particles and gravitons creation after inflation from a 5D vacuum

Mariano Anabitarte; Mauricio Bellini

doi:10.1140/epjp/i2011-11090-0

EPJ

Particles and gravitons creation after inflation from a 5D vacuum

Mariano Anabitarte¹^,2 and Mauricio Bellini¹^,2

¹ Departamento de Fısica, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3350, C.P. 7600, Mar del Plata, Argentina
² Consejo Nacional de Investigaciones Cientıficas y Técnicas (CONICET), Instituto de Investigaciones en Fısicas de Mar del Plata (IFIMAR), Mar del Plata, Argentina

Received: 21 June 2011
Revised: 14 September 2011
Accepted: 15 September 2011
Published online: 11 October 2011

Abstract

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 10⁹⁰ 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 increase on cosmological scales.