Affleck-Dine dynamics and the dark sector of pangenesis

TL;DR

This paper analyzes the dynamics of pangenesis via Affleck-Dine mechanisms, exploring models that relate visible and dark matter asymmetries, and discusses implications for dark matter and collider signatures.

Contribution

It provides a detailed analysis of Affleck-Dine dynamics in baryon-symmetric models, including model construction, parameter space exploration, and phenomenological implications.

Findings

Viable parameter regions identified for gravity- and gauge-mediated supersymmetry breaking.

Conditions for stable or decaying Q-balls consistent with pangenesis outlined.

Constraints from cosmology and collider data discussed for dark sector models.

Abstract

Pangenesis is the mechanism for jointly producing the visible and dark matter asymmetries via Affleck-Dine dynamics in a baryon-symmetric universe. The baryon-symmetric feature means that the dark asymmetry cancels the visible baryon asymmetry and thus enforces a tight relationship between the visible and dark matter number densities. The purpose of this paper is to analyse the general dynamics of this scenario in more detail and to construct specific models. After reviewing the simple symmetry structure that underpins all baryon-symmetric models, we turn to a detailed analysis of the required Affleck-Dine dynamics. Both gravity-mediated and gauge-mediated supersymmetry breaking are considered, with the messenger scale left arbitrary in the latter, and the viable regions of parameter space are determined. In the gauge-mediated case where gravitinos are light and stable, the regime where they constitute a small fraction of the dark matter density is identified. We discuss the formation of Q-balls, and delineate various regimes in the parameter space of the Affleck-Dine potential with respect to their stability or lifetime and their decay modes. We outline the regions in which Q-ball formation and decay is consistent with successful pangenesis. Examples of viable dark sectors are presented, and constraints are derived from big bang nucleosynthesis, large scale structure formation and the Bullet cluster. Collider signatures and implications for direct dark matter detection experiments are briefly discussed. The following would constitute evidence for pangenesis: supersymmetry, GeV-scale dark matter mass(es) and a Z' boson with a significant invisible width into the dark sector.