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If dark matter (DM) contains equal numbers of u,d,s quarks, the ratio of DMand ordinary matter densities is shown to follow from the Boltzmanndistribution in the Quark Gluon Plasma. For sexaquark DM in the 1860-1880 MeVmass range (assuring sexaquark and nuclear stability) and quark masses andtransition temperature from lattice QCD, the observed Omega_{DM}/Omega_b = 5.3is in the predicted range, with <~ 15% uncertainty. The prediction isinsensitive to the current form of DM, which could be sexaquarks, strange quarkmatter nuggets, primordial black holes from their collapse, or a mixture ofthese.

A precision test of the nature of Dark Matter and a probe of the QCD phase transition