Universal critical-curve asymptotics for disordered pinning models

Let hc(β)h_c(\beta) be the critical curve of a disordered pinning model, and let hc(α)(1)\boldsymbol h_c^{(\alpha)}(1) be the critical curve of the continuum model at unit coupling. For a slowly varying function LL, define L~\widetilde L through

L~(x)=[((Lˉα12))(x)]12α1,\widetilde L(x)=\left[((\bar L_{\alpha-\frac12})^*)(x)\right]^{-\frac{1}{2\alpha-1}},

where Lˉα12(x)=1/L(x1/(α1/2))\bar L_{\alpha-\frac12}(x)=1/L(x^{1/(\alpha-1/2)}) and (Lˉα1/2)(\bar L_{\alpha-1/2})^* is its asymptotic inverse in the sense specified in the source. Universal pinning critical-curve conjecture. For any disordered pinning model satisfying with α(12,1)\alpha\in(\frac12,1),

limβ0hc(β)L~(1β)β2α2α1=hc(α)(1).\lim_{\beta\downarrow0}\frac{h_c(\beta)}{\widetilde L(\frac1\beta)\beta^{\frac{2\alpha}{2\alpha-1}}}=\boldsymbol h_c^{(\alpha)}(1).

This predicts that the weak-disorder critical curve has a universal power-law exponent and a slowly varying correction determined by the renewal tail. The supplied text gives no resolution.

Sources & referencesView supporting material

Primary source

Francesco Caravenna, Rongfeng Sun and Nikos Zygouras, “Polynomial chaos and scaling limits of disordered systems”, arXiv:1312.3357 (2016).

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