DOE OSTI · 2861026
LSM and CPT
Abstract
We study a number of 1+1d lattice models with anti-unitary symmetries that simultaneously reflect space and reverse time. Some of these symmetries are anomalous, leading to Lieb-Schultz-Mattis-type constraints, thus excluding a trivially gapped phase. Examples include a mod 8 anomaly in the Majorana chain and various mod 2 anomalies in the spin chain. In some cases, there is an exact, non-anomalous lattice symmetry that flows in the continuum to CPT. In some other cases, the CPT symmetry of the continuum theory is emergent or absent. Depending on the model, the anomaly of the lattice model is matched in the continuum in different ways. In particular, it can be mapped to an emergent anomaly of an emanant symmetry.
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Seiberg, Nathan [Institute for Advanced Study, Princeton, NJ (United States)] (ORCID:000000033897046X), Shao, Shu-Heng [Massachusetts Institute of Technology, Cambridge, MA (United States)] (ORCID:0000000312942786), Zhang, Wucheng [Princeton University, NJ (United States)] (ORCID:0000000327264201). 2025-11-19. LSM and CPT. https://doi.org/10.1007/jhep11(2025)116
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