  Curvaton is an effectively massless field whose energy density during
inflation is negligible but which later becomes dominant. This is a novel
mechanism to generate the scale invariant perturbations. I discuss the
possibility that the curvaton could be found among the fields of the minimally
supersymmetric standard model (MSSM), which contains a number of flat
directions along which the renormalizable potential vanishes. The requirements
of late domination and the absence of damping of the perturbations pick out
essentially a unique candidate for the MSSM curvaton. One must also require
that inflation takes place in a hidden sector. If the inflaton energy density
can be radiated into extra dimensions, many constraints can be relaxed, and the
simplest flat direction consisting of the Higgses H_u and H_d would provide a
working example of an MSSM curvaton.
