In chiral SU(N) gauge theories with mixed one- and two-index matter, the CFL-phase coset topology yields no Skyrmions yet permits stable heavy baryons protected by unbroken symmetries, unlike vector-like models; theta anomalies on domain walls are matched without extra light modes when color is full
On the Foundations of Chiral Perturbation Theory
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abstract
The properties of the effective field theory relevant for the low energy structure generated by the Goldstone bosons of a spontaneously broken symmetry are reexamined. It is shown that anomaly free, Lorentz invariant theories are characterized by a gauge invariant effective Lagrangian, to all orders of the low energy expansion. The paper includes a discussion of anomalies and approximate symmetries, but does not cover nonrelativistic effective theories.
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Baryons, Skyrmions and $\theta$-periodicity anomaly in chiral and vector-like gauge theories
In chiral SU(N) gauge theories with mixed one- and two-index matter, the CFL-phase coset topology yields no Skyrmions yet permits stable heavy baryons protected by unbroken symmetries, unlike vector-like models; theta anomalies on domain walls are matched without extra light modes when color is full