Aidnogenesis via Leptogenesis and Dark Sphalerons

TL;DR

This paper proposes a mechanism called aidnogenesis, where new sphaleron processes linked to an extra gauge symmetry generate an asymmetric dark matter abundance comparable to visible matter, predicting a dark matter mass around 6 GeV.

Contribution

It introduces a minimal model extending the Standard Model with dark fermions and a horizontal symmetry, linking dark matter asymmetry to known baryon and lepton asymmetries.

Findings

Dark matter mass predicted to be approximately 6 GeV.

Model naturally explains the similar energy densities of dark and visible matter.

Potential explanation for the Tevatron dimuon anomaly.

Abstract

We discuss aidnogenesis, the generation of a dark matter asymmetry via new sphaleron processes associated to an extra non-abelian gauge symmetry common to both the visible and the dark sectors. Such a theory can naturally produce an abundance of asymmetric dark matter which is of the same size as the lepton and baryon asymmetries, as suggested by the similar sizes of the observed baryonic and dark matter energy content, and provide a definite prediction for the mass of the dark matter particle. We discuss in detail a minimal realization in which the Standard Model is only extended by dark matter fermions which form "dark baryons" through an SU(3) interaction, and a (broken) horizontal symmetry that induces the new sphalerons. The dark matter mass is predicted to be approximately 6 GeV, close to the region favored by DAMA and CoGeNT. Furthermore, a remnant of the horizontal symmetry should be broken at a lower scale and can also explain the Tevatron dimuon anomaly.