Universal critical-curve asymptotics for disordered pinning models

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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)=[((Lˉα−12)∗)(x)]−12α−1,\widetilde L(x)=\left[((\bar L_{\alpha-\frac12})^*)(x)\right]^{-\frac{1}{2\alpha-1}},

where Lˉα−12(x)=1/L(x1/(α−1/2))\bar L_{\alpha-\frac12}(x)=1/L(x^{1/(\alpha-1/2)}) and (Lˉα−1/2)∗(\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),

lim⁡β↓0hc(β)L~(1β)β2α2α−1=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.

References

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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