Affleck-Dine sneutrino inflation

Motivated by the coincidence between the Hubble scale during inflation and the typical seesaw neutrino mass scale, we present a supergravity model in which the inflaton is identified with a linear combination of right-handed sneutrino fields. The model accommodates an inflaton potential that is flatter than quadratic chaotic inflation, resulting in a tensor-to-scalar ratio that is measurable but not yet ruled out. Small CP violation in the neutrino mass matrix and supersymmetry breaking yield an evolution in the complex plane for the sneutrino fields. This induces a net lepton charge that, via the Affleck–Dine mechanism, can be the origin of the observed baryon asymmetry of the Universe.