Summary
Partition function of the Thirring model on a torus is derived perturbatively, and the result shows that the central charge of the modelC=1 is independent of the four-fermion interaction coupling constant λ.
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Xue, SS. Partition function for thirring model on a torus. Nuov Cim A 103, 1535–1541 (1990). https://doi.org/10.1007/BF02820300
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DOI: https://doi.org/10.1007/BF02820300