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Chiral Phase Transitions

We show that melting the quark mass, the scalar $σ$ mass and the quark condensate leads uniquely to the quark-level SU(2) linear $σ$ model field theory. Upon thermalization, the chiral phase transition curve requires $T_c =2f^{CL}_π\approx 180 MeV$ when $μ= 0$, while the critical chemical potential is $μ_c =m_q\approx 325 MeV$. Transition to the superconductive phase occurs at $T^{(SC)}_c=Δ/πe^{-γ_E}$. Coloured diquarks suggest $T_c^{(SC)}<180 MeV$.