Asymmetric Dark Matter Models in SO(10)

TL;DR

This paper explores asymmetric dark matter within non-supersymmetric SO(10) grand unified theories, focusing on stability, generation mechanisms, and classification of dark matter candidates based on quantum numbers.

Contribution

It systematically classifies asymmetric dark matter candidates in SO(10) models and analyzes their stability and generation mechanisms.

Findings

Dark matter stability is guaranteed by a residual Z2 symmetry.

Asymmetry can be generated via out-of-equilibrium decay or leptogenesis.

Conditions are derived for dark matter asymmetry to account for observed density.

Abstract

We systematically study the possibilities for asymmetric dark matter in the context of non-supersymmetric SO(10) models of grand unification. Dark matter stability in SO(10) is guaranteed by a remnant $\mathbb{Z}_2$ symmetry which is preserved when the intermediate scale gauge subgroup of SO(10) is broken by a ${\bf 126}$ dimensional representation. The asymmetry in the dark matter states is directly generated through the out-of-equilibrium decay of particles around the intermediate scale, or transferred from the baryon/lepton asymmetry generated in the Standard Model sector by leptogenesis. We systematically classify possible asymmetric dark matter candidates in terms of their quantum numbers, and derive the conditions for each case that the observed dark matter density is (mostly) explained by the asymmetry of dark matter particles.