The three-flavor QCD phase diagram at finite isospin and strangeness chemical potentials acquires a theta-dependence with a novel parity-preserving superfluid phase at theta = pi and no Dashen transition inside the superfluid phases.
Some remarks on pion condensation in relativistic heavy ion collisions
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Recently it was pointed out that coherent or condensated states of pions may account for the explanation of the Centauro events observed in cosmic ray showers. We argue that an occurrence of condensed pions requires that the system evolves far out of thermal equilibrium. Besides an unusual charge ratio distribution we show that such a produced state also would lead to strong isospin correlations.
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On the $\theta$-angle physics of QCD under pressure: The strange and isospin phase diagram
The three-flavor QCD phase diagram at finite isospin and strangeness chemical potentials acquires a theta-dependence with a novel parity-preserving superfluid phase at theta = pi and no Dashen transition inside the superfluid phases.