title: Adiabatic density perturbations and matter generation from the minimal supersymmetric standard model.
abstract: We propose that the inflaton is coupled to ordinary matter only gravitationally and that it decays into a completely hidden sector. In this scenario both baryonic and dark matter originate from the decay of a flat direction of the minimal supersymmetric standard model, which is shown to generate the desired adiabatic perturbation spectrum via the curvaton mechanism. The requirement that the energy density along the flat direction dominates over the inflaton decay products fixes the flat direction almost uniquely. The present residual energy density in the hidden sector is typically shown to be small.
authors.affiliation: Department of Physical Sciences, P.O. Box 64, FIN-00014, University of Helsinki, Helsinki, Finland.
authors.forename: Kari
authors.initials: K
authors.lastname: Enqvist
authors.forename: Shinta
authors.initials: S
authors.lastname: Kasuya
authors.forename: Anupam
authors.initials: A
authors.lastname: Mazumdar