Anomaly and global inconsistency matching: -angles, nonlinear sigma model, chains and its generalizations
arXiv:1805.11423 · doi:10.1103/PhysRevB.98.115126
Abstract
We discuss the nonlinear sigma model in 1+1D and, more broadly, its linearized counterparts. Such theories can be expressed as gauge theories and therefore allow for two topological -angles. These models provide a field theoretic description of the chains. We show that, for particular values of -angles, a global symmetry group of such systems has a 't Hooft anomaly, which manifests itself as an inability to gauge the global symmetry group. By applying anomaly matching, the ground-state properties can be severely constrained. The anomaly matching is an avatar of the Lieb-Schultz-Mattis (LSM) theorem for the spin chain from which the field theory descends, and it forbids a trivially gapped ground state for particular -angles. We generalize the statement of the LSM theorem and show that 't Hooft anomalies persist even under perturbations which break the spin-symmetry down to the discrete subgroup . In addition the model can further be constrained by applying global inconsistency matching, which indicates the presence of a phase transition between different regions of -angles. We use these constraints to give possible scenarios of the phase diagram. We also argue that at the special points of the phase diagram the anomalies are matched by the Wess-Zumino-Witten model. We generalize the discussion to the nonlinear sigma models as well as the 't Hooft anomaly of the Wess-Zumino-Witten model, and show that they match. Finally the -dimensional extension is considered briefly, and we show that it has various 't Hooft anomalies leading to nontrivial consequences.
arXiv comment28 pages, 3 figures;(v2) Sec.VB added, Fig.2 updated, refs updated
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