Relating the baryon asymmetry to the thermal relic dark matter density

We present a generic framework, baryomorphosis, which modifies the baryon asymmetry to be naturally of the order of a typical thermal relic weakly interacting massive particle (WIMP) density. We consider a simple scalar-based model to show how this is possible. This model introduces a sector in which a large initial baryon asymmetry is injected into particles (''annihilons''), phi(B), (phi) over cap (B), of mass similar to 100 GeV-1 TeV. phi(B)(phi) over cap (B) annihilations convert the initial phi(B), (phi) over cap (B) asymmetry to a final asymmetry with a thermal relic WIMP-like density. This subsequently decays to a conventional baryon asymmetry whose magnitude is naturally related to the density of thermal relic WIMP dark matter. In this way the two coincidences of baryons and dark matter, i.e. why their densities are similar to each other and why they are both similar to a WIMP thermal relic density (the WIMP miracle''), may be understood. The model may be tested by the production of annihilons at colliders.