Inflation and leptogenesis in a U(1)-enhanced supersymmetric model

Abstract

Motivated by the flavored Peccei-Quinn symmetry for unifying flavor physics and string theory, we investigate a supersymmetric extension of standard model for an explanation of inflation and leptogenesis by introducing U(1) symmetries such that the U(1) - [gravity](2) anomaly-free condition together with the standard model flavor structure demands additional sterile neutrinos as well as no axionic domain-wall problem. Such additional neutrinos may play a crucial role as a bridge between leptogenesis and new neutrino oscillations along with high-energy cosmic events. In a realistic moduli stabilization, we show that the moduli backreaction effect on the inflationary potential leads to the energy scale of inflation with the inflaton mass in a way that the power spectrum of the curvature perturbation and the scalar spectral index are to be well fitted with the latest Planck observation. We suggest that a new leptogenesis scenario could naturally be implemented via the Affleck-Dine mechanism. So, we show that the resultant baryon asymmetry, constrained by the sum of active neutrino masses and new high-energy neutrino oscillations, crucially depends on the reheating temperature T-reh. And we show that the model has a preference on T-reh similar to 10(3) TeV, which is compatible with the required T(reh )to explain the baryon asymmetry of the Universe.