Renormalization group theory for finite-size scaling in extreme statistics

Details Renormalization group theory for finite-size scaling in extreme statistics Renormalization group theory for finite-size scaling in extreme statistics

2010-04-05

arxiv.org/abs/1004.0642v1

Physics

Condensed Matter

Statistical Mechanics

15 pages, 8 figures, to appear in Phys. Rev. E

Scientific paper

We present a renormalization group (RG) approach to explain universal features of extreme statistics, applied here to independent, identically distributed variables. The outlines of the theory have been described in a previous Letter, the main result being that finite-size shape corrections to the limit distribution can be obtained from a linearization of the RG transformation near a fixed point, leading to the computation of stable perturbations as eigenfunctions. Here we show details of the RG theory which exhibit remarkable similarities to the RG known in statistical physics. Besides the fixed points explaining universality, and the least stable eigendirections accounting for convergence rates and shape corrections, the similarities include marginally stable perturbations which turn out to be generic for the Fisher-Tippett-Gumbel class. Distribution functions containing unstable perturbations are also considered. We find that, after a transitory divergence, they return to the universal fixed line at the same or at a different point depending on the type of perturbation.

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