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We show that the correlator of three large charge operators with minimal scaling dimension can be computed semiclassically in conformal field theories (CFTs) with a U (1) symmetry for arbitrary fixed values of the ratios of their charges. We obtain explicitly the operator product expansion coefficient from the numerical solution of a nonlinear boundary value problem in the conformal superfluid effective field theory in 3d. The result applies in all three-dimensional CFTs with a U (1) symmetry whose large charge sector is a superfluid.
Gabriel Cuomo (Fri,) studied this question.