Thermal leptogenesis in extended supersymmetric seesaw model

Abstract

We consider an extended supersymmetric SO(10) seesaw model with only doublet Higgs scalars, in which neutrino masses are suppressed by the scale of $D$-parity violation. Leptogenesis can occur at the TeV scale through the decay of a singlet $\ensuremath{\Sigma}$, thereby avoiding the gravitino crisis. Washout of the asymmetry can be effectively suppressed by the absence of direct couplings of $\ensuremath{\Sigma}$ to leptons.