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 ℤ2 symmetry which is preserved when the intermediate scale gauge subgroup of SO(10) is broken by a 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.
Bibliographical noteFunding Information:
This work was supported in part by DOE grant DE-SC0011842 at the University of Minnesota.
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- baryon asymmetry
- dark matter theory
- particle physics-cosmology connection