We present a simple extension of the standard model that gives rise to baryogenesis and has a dark matter candidate of $\mathcal{O}(\mathrm{GeV})$ mass. A minimal set of new fields required for baryogenesis includes two $\mathcal{O}(\mathrm{TeV})$ 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 from 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 multicomponent dark matter scenario, which improves the direct and indirect detection prospects.

• Received 12 April 2013

DOI:https://doi.org/10.1103/PhysRevD.88.023525