Short distance behaviour of correlators in the 2 D Ising model in a magnetic field


We study the σσ, σǫ, ǫǫ correlators in the 2d Ising model perturbed by a magnetic field. We compare the results of a set of high precision Montecarlo simulations with the predictions of two different approximations: the Form Factor approach, based on the exact S-matrix description of the model, and a short distance perturbative expansion around the… (More)


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