Thermal inflation and baryogenesis in heavy gravitino scenario

TL;DR

This paper proposes a thermal inflation model that integrates Affleck-Dine leptogenesis in a heavy gravitino scenario, addressing the moduli-induced gravitino problem while matching observed baryon asymmetry and dark matter density.

Contribution

It introduces a novel model combining thermal inflation with Affleck-Dine leptogenesis in heavy gravitino scenarios, stabilizing flat directions and linking dark matter to flatino or axino.

Findings

The model successfully solves the moduli-induced gravitino problem.

It reproduces the observed baryon asymmetry.

It satisfies cosmological constraints from BBN and dark matter abundance.

Abstract

We present a thermal inflation model that incorporates the Affleck-Dine leptogenesis in heavy gravitino/moduli scenario, which solves the moduli-induced gravitino problem while producing a correct amount of baryon asymmetry and relic dark matter density. The model involves two singlet flat directions stabilized by radiative corrections associated with supersymmetry breaking, one direction that generates the Higgs \mu and B parameters, and the other direction that generates the scale of spontaneous lepton number violation. The dark matter is provided by the lightest flatino which might be identified as the axino if the model is assumed to have a U(1)_{PQ} symmetry to solve the strong CP problem. We derive the conditions for the model to satisfy various cosmological constraints coming from the Big-Bang nucleosynthesis and the dark matter abundance.