Mesoscopic central limit theorem for the circular β-ensembles and applications

We give a simple proof of a central limit theorem for linear statistics of the circular β-ensembles which is valid at almost microscopic scales for functions of class C3 . Using a coupling introduced by Valkò and Viràg [48], we deduce a central limit theorem for the Sineβ processes. We also discuss connections between our result and the theory of Gaussian Multiplicative Chaos. Based on the results of [37], we show that the exponential of the logarithm of the real (and imaginary) part of the characteristic polynomial of the circular β-ensembles, regularized at a small mesoscopic scale and renormalized, converges to GMC measures in the subcritical regime. This establishes that the leading order behavior for the extreme values of the logarithm of the characteristic polynomial is consistent with the predictions coming from log-correlated Gaussian field theory.