Abstract
We consider the minimal model in which dark matter is stabilized by a non-Abelian discrete symmetry. The symmetry group is taken to be D3≅S3, which is the smallest non-Abelian finite group. The minimal model contains (nontrivial) singlet and doublet scalar representations of D3 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 D3 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.
Highlights
Understanding the nature of the cosmological dark matter (DM) that constitutes one quarter of the energy density of the universe is a central goal of particle physics today [1]
In this paper we have investigated the simplest model in which DM is stabilized by a nonAbelian discrete symmetry
The model is based on the symmetry group D3, which is the smallest non-Abelian finite group
Summary
Where v0 is the DM velocity dispersion. Observe that 1) only the product ρiσn(i) enters in dR/dER and 2) the exponential shape of the spectrum becomes independent of the DM mass for mi ≫ mN. For example, mass and density of the heavier DM to its input values, one recovers recovers all remaining model parameters within a “1σ”-range or better If one tried to fit the light DM particle to a single bin, many combinations (m1, σ1) would reproduce the signal leading to a high degree of degeneracy in m1 and σ1 In this regard, it is important to note that—complementary to liquid noble gas experiments— potential future ton-scale cryogenic detectors such as superCDMS [45] or EURECA [46] may be very powerful in disentangling the parameters of a multi-component DM scenario. A different target mass with respect to Xe may prove most valuable when attempting to draw differential conclusions by combining results from both detector designs
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