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The six Higgs doublet model is a minimal extension of the Standard Model thataddresses dark matter and gauge coupling unification. Another Higgs doublet ina 5 representation of a discrete symmetry group, such as S_6, is added to theSM. The lightest components of the 5-Higgs are neutral, stable and serve asdark matter so long as the discrete symmetry is not broken. Direct and indirectdetection signals, as well as collider signatures are discussed. The five-foldmultiplicity of the dark matter decreases its mass and typically helps make thedark matter more visible in upcoming experiments.

Unification and Dark Matter in a Minimal Scalar Extension of the Standard Model