riassunto2

Speaker	Bouhmadi Lopez, Mariam
Co-autors	*Pedro Frazao, Alfredo B. Henriques*
Talk Title	Gravitons production in a new type of Generalized Chaplygin gas
Abstract	We propose a new early scenario for the Universe where there is a smooth transition between an early de Sitter-like phase which is followed by a radiation dominated era. In this model, the matter content is modelled either by a scalar field or a new modified generalised Chaplygin gas. Such a description is similar in spirit to that introduced by Kamenshchik et al. to unify the dark sectors of the universe. We study the scalar and tensorial perturbations - density perturbations and gravitons, respectively - generated by quantum fluctuations of the scalar field. In particular, we calculate the gravitational wave power spectrum, as would be measured today, following the method of the Bogoliubov coefficients. We show that the high frequencies range of the spectrum depends strongly on one of the parameter of our new model.
Talk view
Back to previous page