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I present a class of hidden sector dark matter (DM) models with local darkgauge symmetries, where DM is stable due to unbroken local dark gauge symmetry,or due topology, or it is long-lived because of some accidental symme- tries,and the particle contents and their dynamics are completely fixed by localgauge symmetries. In these models, one have two types of natural forcemediators, dark gauge bosons and dark Higgs boson, which would affect DM andHiggs phenomenology in important ways. I discuss various phenomenologicalissues including the GeV scale gamma-ray excess from the galactic center (GC),(in)direct detection signatures, dark radiation, Higgs phenomenology and Higgsinflation assisted by dark Higgs.

Dark matter, dark radiation and Higgs phenomenology in the hidden sector DM models