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The cosmological scenario of the dark matter generated in the hidden gaugetheory based on the grand unification is discussed. It is found that thestability of the dark matter halo of our Galaxy and the cosmic ray observationconstrain, respectively, the dark matter mass and the unification scale betweenthe standard model and the hidden gauge theory sectors. To obtain aphenomenologically consistent thermal evolution, the entropy of the standardmodel sector needs to be increased. We therefore propose a scenario where themini-inflation is induced from the potential coupled to the Standard modelsector, in particular the Higgs sector. This scenario makes consistent thecurrent dark matter density as well as the baryon-to-photon ratio for the caseof pion dark matter. For the glueball or heavy pion of hidden gauge theory, anadditional mini-inflation in the standard model sector before the leptogenesisis required. We also propose the possibility to confirm this scenario by knownprospective experimental approaches.

Dark matter in the hidden gauge theory