Universal weak-disorder asymptotics for directed-polymer free energy

Let β>0\beta>0 denote the disorder strength, let F(β)F(\beta) be the directed-polymer free energy, and let F(1)\boldsymbol F(1) be the corresponding continuum free energy at unit coupling. Universal directed-polymer free-energy conjecture. For any directed polymer model satisfying Assumption~,

limβ0F(β)β2αα1=limδ0F(δα12α)δ=F(1).\lim_{\beta\downarrow 0} \frac{F(\beta)}{\beta^{\frac{2\alpha}{\alpha-1}}}=\lim_{\delta\downarrow 0}\frac{F(\delta^{\frac{\alpha-1}{2\alpha}})}{\delta}=\boldsymbol F(1).

This predicts a universal weak-disorder scaling law governed by the continuum directed-polymer model. The supplied text states the prediction but gives no resolution or supporting theorem for this asymptotic.

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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