Within the interacting instanton liquid model, the free-energy curvature at the chiral origin is negative for SU(2) quarks, positive near the SU(3) limit, and crosses to negative when ms/mq exceeds about 3.
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Different scenarios of dynamical chiral symmetry breaking in the interacting instanton liquid model via flavor symmetry breaking
Within the interacting instanton liquid model, the free-energy curvature at the chiral origin is negative for SU(2) quarks, positive near the SU(3) limit, and crosses to negative when ms/mq exceeds about 3.