Speaker
Prof.
Joan Solà
(Universitat de Barcelona)
Description
An accelerated universe should naturally have a vacuum energy density determined by its dynamical curvature. The so-called cosmological constant is most likely a temporary description of a cosmic variable that has been drastically evolving from the early inflationary era to the present. In this talk, I will discuss a unified picture (in fact a class of models) of the expansion history of our Universe implementing such an idea. The main stages, from inflation and its (``graceful'') exit into a standard radiation regime, as well as the matter and dark energy epochs, are accounted for. Furthermore, for a generic Grand Unified Theory associated to the inflationary phase, the amount of entropy generated from primeval vacuum decay within this class of models can explain the huge value measured today.
Author
Prof.
Joan Solà
(Universitat de Barcelona)
