Non-Abelian discrete dark matter

We consider the minimal model in which dark matter is stabilized by a non-Abelian discrete symmetry. The symmetry group is taken to be D-3 congruent to S-3, which is the smallest non-Abelian finite group. The minimal model contains (nontrivial) singlet and doublet scalar representations of D-3 which couple to the Standard Model fields via the Higgs portal. This construction predicts two species of dark matter over much of the parameter space. Nontrivial interactions under D-3 lead to a novel thermal history of dark matter, while the multi-component nature of dark matter can be tested by future direct detection experiments. (C) 2011 Elsevier B.V. All rights reserved.