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Quark Masses and Chiral Symmetry
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abstract
I discuss the global structure of the strongly interacting gauge theory of quarks and gluons as a function of the quark masses and the CP violating parameter $\theta$. I concentrate on whether a first order phase transition occurs at $\theta=\pi.$ I show why this is expected when multiple flavors have a small degenerate mass. This transition can be removed by sufficient flavor-breaking. I speculate on the implications of this structure for Wilson's lattice fermions.
Forward citations
Cited by 1 Pith paper
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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 su...
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