Abstract
Scenarios with hidden, spontaneously broken, non-abelian gauge groups contain a natural dark matter candidate, the hidden vector, whose longevity is due to an accidental custodial symmetry in the renormalizableLagrangian. Nevertheless, non-renormalizable dimension six operatorsbreak the custodial symmetry and induce the decayof the dark matter particle at cosmological times. We discuss in this paper the cosmicray signatures of this scenario and we showthat the decay of hidden vector dark matter particles genericallyproduce an intense gamma ray line which could be observedby the Fermi-LAT experiment, if the scale of custodial symmetry breaking is closeto the Grand Unification scale. This gamma line proceeds directly from a tree leveldark matter 2-body decay in association with a Higgs boson.Within this model we also perform a determination of the relic densityconstraints taking into account the dark matterannihilation processes with one dark matter particle in the final state. The corresponding direct detection rates can be easily of order the current experimental sensitivities.
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