SEMINAR

Gravitinos in the RSII brane

Dr. Nuno M. C. Santos

(Institut Für Theoretische Physik, Uni. Heidelberg)

Sala P8, IST, Edifício Matemática
Tuesday, March 27th, 2007 at 04:00 PM

Abstract

Braneworld modifications to the Friedmann expansion law can have an important effect on the cosmological evolution of the early universe. In particular, the primordial particle abundances crucially depend on the rate at which the universe expanded at early times. We discuss the production of gravitinos, both from thermal creation and from the decay of a heavy scalar, in the Randall-Sundrum II braneworld context. After that, we present the resulting constraints on the parameter space, both for the stable and unstable gravitino cases. We conclude that, depending on the value of the 5D fundamental Planck mass, some of the usual standard cosmology constraints on the reheating temperature and on the mass of the heavy scalar can be evaded.