A modular S-transformation criterion on twisted torus partition functions detects zero-form discrete symmetry anomalies in 2D RCFTs, and it matches boundary-state and orbifold conditions in WZW models.
Orbifolding D2l type WZW model,
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Two-dimensional Anomaly, Orbifolding, and Boundary States
A modular S-transformation criterion on twisted torus partition functions detects zero-form discrete symmetry anomalies in 2D RCFTs, and it matches boundary-state and orbifold conditions in WZW models.