The strong path localization conjecture for directed polymers

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Let u u be the law of the random environment, and let β\beta denote the inverse temperature. For a polymer measure μβ,n\mu_{\beta,n} on paths of length nn, let ℓ(μβ,n)\ell(\mu_{\beta,n}) and ρ(μβ,n)\rho(\mu_{\beta,n}) denote the quenched localization observables defined in the paper. Under suitable conditions on u u, Strong path localization conjecture. There \exists β0\beta_0 such that for every β≥β0\beta\geq\beta_0, there \exists δ>0\delta>0 such that

lim⁡n→∞P(ℓ(μβ,n)≥δ)=lim⁡n→∞P(ρ(μβ,n)≥δ)=1.\lim_{n\to\infty}\mathbb{P}(\ell(\mu_{\beta,n})\geq\delta)=\lim_{n\to\infty}\mathbb{P}(\rho(\mu_{\beta,n})\geq\delta)=1.

This asserts a stronger form of quenched path localization than the main theorem, which gives an upper bound on the probability that the localization observables are small for bounded-support environments satisfying the stated regularity assumptions. The conjecture concerns their asymptotic behavior as the polymer length tends to infinity.

References

Primary source

Sourav Chatterjee, “Proof of the path localization conjecture for directed polymers”, arXiv:1806.04220 (2019).

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