Cladogenesis: Baryon-Dark Matter Coincidence from Branchings in Moduli Decay

TL;DR

This paper proposes a scenario where late-time decay of moduli particles explains the observed baryon asymmetry and dark matter abundance, linking their origins through decay chain processes and dilution effects.

Contribution

It introduces a novel mechanism connecting baryogenesis and dark matter production via moduli decay, with quantitative predictions matching observations.

Findings

Baryon asymmetry generated from TeV scale particle decay.

Dark matter produced from decay chains without annihilation.

Predicted dark matter mass range of 5-500 GeV.

Abstract

We propose late-time moduli decay as the common origin of baryons and dark matter. The baryon asymmetry is produced from the decay of new TeV scale particles, while dark matter is created from the (chain) decay of R-parity odd particles without undergoing any annihilation. The baryon and dark matter abundances are mainly controlled by the dilution factor from moduli decay, which is typically in the range 10^{-9}-10^{-7}. The exact number densities are determined by simple branching fractions from modulus decay, which are expected to be of similar order in the absence of symmetries. This scenario can naturally lead to the observed baryon asymmetry and, for moderate suppression of the two-body decays of the modulus to R-parity odd particles, can also yield the correct dark matter abundance for a dark matter mass in the (5-500) GeV range.