Flavor-mixing effects on the QCD phase diagram at non-vanishing isospin chemical potential: one or two phase transitions?

We investigate effects of a fixed nonzero isospin chemical potential on the μB–T phase diagram of strongly interacting matter using a Nambu–Jona-Lasinio-type four fermion interaction. We focus on the influence of a flavor-mixing interaction induced by instantons. We find that already for rather moderate values of the coupling strength in the flavor-mixing channel the recent findings of two separate phase transitions do not persist.