Affleck-Dine baryogenesis after D-term inflation and solutions to the baryon-DM coincidence problem

TL;DR

This paper explores how Affleck-Dine baryogenesis occurs after D-term inflation with a positive Hubble-induced mass, generating baryon asymmetry and addressing the baryon-DM coincidence problem, with testable predictions for CMB observations.

Contribution

It presents a detailed scenario of baryogenesis post D-term inflation and proposes a model explaining the baryon-DM coincidence, including observable consequences.

Findings

Predicts nonzero baryonic isocurvature perturbations detectable by future CMB observations.

Provides a D-term inflation model that naturally explains the baryon and dark matter energy density coincidence.

Demonstrates the dynamics of B-L flat directions during and after inflation.

Abstract

We investigate the Affleck-Dine baryogenesis after D-term inflation with a positive Hubble-induced mass term for a B-L flat direction. It stays at a large field value during D-term inflation, and just after inflation ends it starts to oscillate around the origin of the potential due to the positive Hubble-induced mass term. The phase direction is kicked by higher-dimensional Kahler potentials to generate the B-L asymmetry. The scenario predicts nonzero baryonic isocurvature perturbations, which would be detected by future observations of CMB fluctuations. We also provide a D-term inflation model which naturally explain the coincidence of the energy density of baryon and dark matter.