A ratio of partition functions on branched covers, defined by Cauchy-Hadamard renormalization, transforms under Weyl rescalings exactly as twist-field correlation functions with weights Δ_j = (c/12) Σ (1 - 1/ord_f(z)).
Nuclear Physics B Volume 424, Issue 3, 15 August 1994, Pages 443-467
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Entanglement Entropy and Cauchy-Hadamard Renormalization
A ratio of partition functions on branched covers, defined by Cauchy-Hadamard renormalization, transforms under Weyl rescalings exactly as twist-field correlation functions with weights Δ_j = (c/12) Σ (1 - 1/ord_f(z)).