Affleck-Dine Baryogenesis in Type IIB String Models

TL;DR

This paper demonstrates a string theory-based model where Affleck-Dine baryogenesis occurs in type IIB sequestered models, linking inflation, baryon asymmetry, and dark matter production.

Contribution

It provides a viable string embedding of Affleck-Dine baryogenesis with specific conditions on the moduli and matter fields, connecting inflation, baryogenesis, and dark matter.

Findings

Baryon asymmetry can be generated with natural parameters.

Reheating temperature supports thermal Higgsino-like dark matter.

Model links inflation, baryogenesis, and dark matter in string theory.

Abstract

We present a viable string embedding of Affleck-Dine baryogenesis in type IIB sequestered models where the late-time decay of the lightest modulus reheats the universe to relatively low temperatures. We show that if inflation is driven by a blow-up Kaehler modulus, the Affleck-Dine field can become tachyonic during inflation if the Kaehler metric for matter fields has an appropriate inflaton-dependent contribution. We find that the Affleck-Dine mechanism can generate the observed baryon asymmetry for natural values of the underlying parameters which lead also to successful inflation and low-energy gaugino masses in a split supersymmetry scenario. The reheating temperature from the lightest modulus decay is high enough to allow thermal Higgsino-like dark matter.