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T: Fachverband Teilchenphysik

T 21: Neutrinophysik / Astroteilchenphysik und Kosmologie (Theorie)

T 21.3: Vortrag

Dienstag, 29. März 2011, 17:15–17:30, 30.23: 3-1

Sneutrino Hybrid Inflation and Nonthermal Leptogenesis — Stefan Antusch, Jochen Baumann, •Valerie Domcke, and Philipp Kostka — Max-Planck-Institut für Physik, München, Germany

In sneutrino hybrid inflation, the superpartner of one of the right-handed neutrinos involved in the seesaw mechanism plays the role of the inflaton field. It obtains a large mass at the so-called waterfall phase transition which ends hybrid inflation. After this phase transition, the oscillations of the sneutrino inflaton field may dominate the universe and efficiently produce the observed baryon asymmetry via nonthermal leptogenesis.

In this framework, we derive the predictions for the cosmic microwave background observables and investigate the conditions under which both inflation and leptogenesis, in agreement with latest experimental results, can be realised. At the same time, this framework can satisfy the bounds imposed on the reheat temperature by the gravitino problem.

We point out which constraints successful inflation and leptogenesis impose on the seesaw parameters, i.e. on the neutrino Yukawa couplings and the mass of the right-handed neutrino, and thus obtain an upper bound for the mass of the lightest lefthanded neutrino in this framework.