Universality for the pinning model in the weak coupling regime

• Francesco Caravenna ^[1] ; Fabio Lucio Toninelli ^[2] ; Niccolò Torri ^[2]
  1. [1] University of Milano-Bicocca

     University of Milano-Bicocca

     Milán, Italia

     
  2. [2] Universté de Lyon (France)
• Localización: Annals of probability: An official journal of the Institute of Mathematical Statistics, ISSN 0091-1798, Vol. 45, Nº. 4, 2017, págs. 2154-2209
• Idioma: inglés
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• Resumen

  • We consider disordered pinning models, when the return time distribution of the underlying renewal process has a polynomial tail with exponent α∈(12,1)α∈(12,1). This corresponds to a regime where disorder is known to be relevant, that is, to change the critical exponent of the localization transition and to induce a nontrivial shift of the critical point. We show that the free energy and critical curve have an explicit universal asymptotic behavior in the weak coupling regime, depending only on the tail of the return time distribution and not on finer details of the models. This is obtained comparing the partition functions with corresponding continuum quantities, through coarse-graining techniques.