Cosmology with a Heavy Polonyi Field

TL;DR

This paper presents a cosmological model with a heavy Polonyi field that decays before BBN, addressing dark matter and baryon asymmetry through entropy production and the Affleck-Dine mechanism, consistent with observations.

Contribution

It introduces a scenario where a heavy Polonyi field decays early, enabling a natural explanation of the baryon-to-dark matter ratio in sequestering models with a QCD axion.

Findings

Polonyi field decays before BBN avoiding constraints

Dark matter abundance explained via entropy production

Baryon asymmetry generated by Affleck-Dine mechanism

Abstract

We consider a cosmologically consistent scenario with a heavy Polonyi field. The Polonyi field with a mass of ${\cal O}(100){\rm\,TeV}$ decays before the Big-Bang Nucleosynthesis (BBN) and avoids the severe constraint from the BBN. However, the abundance of the Lightest Supersymmetric Particle (LSP) produced from the decay often exceeds the observed dark matter density. In our scenario, the dark matter density is obtained by the LSP abundance with an aid of entropy production, and baryon asymmetry is generated by the Affleck-Dine mechanism. We show that the observed baryon-to-dark matter ratio of ${\cal O}(0.1\mathchar`-1)$ is naturally explained in sequestering models with a QCD axion.