Entanglement entropies of minimal models from null-vectors

Abstract

We present a new method to compute Rényi entropies in one-dimensional critical systems. The null-vector conditions on the twist fields in the cyclic orbifold allow us to derive a differential equation for their correlation functions. The latter are then determined by standard bootstrap techniques. We apply this method to the calculation of various Rényi entropies in the non-unitary Yang-Lee model.

43 pages, 7 figures

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