Entanglement entropies of minimal models from null-vectors

摘要

We present a new method to compute R\'enyi entropies in one-dimensionalcritical systems. The null-vector conditions on the twist fields in the cyclicorbifold allow us to derive a differential equation for their correlationfunctions. The latter are then determined by standard bootstrap techniques. Weapply this method to the calculation of various R\'enyi entropies in thenon-unitary Yang-Lee model.