Leptogenesis from composite singlets

TL;DR

This paper proposes a model where dual singlets enable thermal leptogenesis at low reheating temperatures, linking neutrino masses and potential neutrino flux signals from gravitino decay.

Contribution

It introduces a novel framework using dual singlets in metastable supersymmetry breaking to explain leptogenesis and neutrino masses at low reheating temperatures.

Findings

Reheating temperature can be as low as 10^4 GeV.

Neutrino masses are generated from dual fermions at ~0.1 eV.

Potential neutrino flux signals from gravitino decay at 10 MeV.

Abstract

We argue that dual singlets accommodate the thermal leptogenesis in the context of metastable supersymmetry breaking. This framework suggests that the reheating temperature is as low as O(10^4) GeV, and besides the neutrino masses, solely induced from the dual fermions, are present at O(0.1) eV. We also expect that the unstable gravitino, though long-lived, may cause a clear signal of the neutrino flux at O(10) MeV.