A systematic perturbation theory for high-density quark gas is developed. The ground-state thermodynamic potential is evaluated up to the second order in the Gell-Mann-Low coupling αₛ(M). Phenomenological analysis of the resulting equation of state suggests that the neutron-quark matter phase transition occurs at neutron matter densities nB<2 baryon/fm³ provided 0.2<αₛ(3 GeV)<0.3. The result supports the conjecture that superheavy stellar objects may exist in the quark rather than in the neutron phase. The production of quark matter in heavy-ion collisions is also discussed briefly.
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Varouzhan Baluni (1978) studied this question.
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