Natural GeV Dark Matter and the Baryon-Dark Matter Coincidence Puzzle

TL;DR

This paper proposes a minimal extension to the standard model that explains the baryon-dark matter coincidence by linking baryogenesis and GeV-scale dark matter production through heavy scalar decays, with testable predictions at the LHC.

Contribution

It introduces a simple, minimal model connecting baryogenesis and dark matter, with a novel mechanism involving heavy scalar decay and near-degenerate fermion mass, extending to supersymmetry.

Findings

Dark matter candidate evades current detection methods.

Model naturally explains baryon-dark matter abundance coincidence.

Supersymmetric extension enhances detection prospects.

Abstract

We present a simple extension of the standard model that gives rise to baryogenesis a has a dark matter candidate of O(GeV) mass. A minimal set of new fields required for baryogenesis includes two O(TeV) colored scalars and a singlet fermion. The fermion also becomes a viable dark matter candidate when its is nearly degenerate in mass with the proton. Dark matter and baryon asymmetry are produced form the decay of heavy scalars, which can lead to a natural explanation of the baryon-dark matter coincidence problem. The dark matter candidate escapes direct and indirect detection, but can be probed at the LHC. The supersymmetric extension of this model is straightforward and leads to a multi-component dark matter scenario, which improves the direct and indirect detection prospects.