APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Jason Evans (KIAS)
Title: Affleck-Dine Sneutrino Inflation & SU(5) Grand Unification in Pure Gravity Mediation
Date (JST): Thu, Dec 24, 2015, 13:30 - 14:30
Place: Seminar Room B
Abstract: Talk 1:
Motivated by the coincidence between the Hubble scale during inflation and the typical see-saw neutrino mass scale, we present a supergravity model where 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 measurable but not yet ruled out tensor-to-scalar ratio. 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.
Talk 2:
We discuss the proton lifetime in pure gravity mediation models with nonuniversal Higgs soft masses. Pure gravity mediation offers a simple framework for studying SU(5) grand unified theories with a split supersymmetry like spectra. We find that for much of the parameter space gauge coupling unification is quite good leading to rather long lifetimes for the proton. However, for m3/2 ∼ 60 TeV and tan