Axino Dark Matter in Moduli-induced Baryogenesis

TL;DR

This paper explores axino dark matter production and baryogenesis in a moduli-dominated universe with large R-parity violation, showing how late-decaying moduli can yield correct dark matter abundance and baryon asymmetry.

Contribution

It introduces a scenario where axino dark matter and baryogenesis are simultaneously achieved through moduli decay and RPV, with suppressed axino decay ensuring stability.

Findings

Axino abundance matches observed dark matter density.

Baryon asymmetry generated via moduli-induced baryogenesis.

Axino remains cosmologically stable despite large RPV.

Abstract

We consider axino dark matter in large R-parity violation (RPV). In moduli-dominated universe, axino is produced thermally or non-thermally via saxion decay, then late-decaying moduli dilute axino density, which results in the right abundance to explain the present dark matter. At the same time baryon asymmetry is generated due to moduli-induced baryogenesis via the large RPV. Axino is cosmologically stable in spite of the large RPV since its decay rate is suppressed by the axion decay constant, heavy squark mass or kinematics.