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A spontaneously broken hidden U(1)_h gauge symmetry can explain both the dark matter stability and the observed relic abundance. In this framework, the light gauge boson can mediate the strong dark matter self-interaction, which addresses astrophysical observations that are hard to explain in collisionless cold dark matter. Motivated by flavoured grand unified theories, we introduce right-handed neutrinos and a flavoured B - L gauge symmetry for the third family U(1)_(B-L)_3. The unwanted relicdoi:10.1007/jhep03(2019)021 fatcat:3tuyonwajrbzhcqsf2ubmg25iq