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On the renormalization group fixed point of the two-dimensional Ising model at criticality

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Scientific Reports, 13 (1): 14859 (08.09.2023)
DOI: 10.1038/s41598-023-42005-4

Аннотация

We analyze the renormalization group fixed point of the two-dimensional Ising model at criticality. In contrast with expectations from tensor network renormalization (TNR), we show that a simple, explicit analytic description of this fixed point using operator-algebraic renormalization (OAR) is possible. Specifically, the fixed point is characterized in terms of spin-spin correlation functions. Explicit error bounds for the approximation of continuum correlation functions are given.

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