Quantitative sub-ballisticity of self-avoiding walk on $\mathbb{Z}^d$

Abstract

We prove quantitative sub-ballisticity for the self-avoiding walk on the lattice $\mathbb{Z}^d$, $d\geq 2$. Namely, we obtain an explicit exponential rate of decay for the probability that a self-avoiding walk of length $n$ reaches distance at least $vn$, in terms of $v>0$. As a consequence, we show that the displacement of an $n$-step self-avoiding walk is at most $n/\exp(c\log^* n)$ with very high probability. Previously, only a non-quantitative $o(n)$ bound was known from the work of Duminil-Copin and Hammond. Along the way, we show that at criticality the partition function of bridges of length $n$ is on average bounded by $C/\log\log n$, which we believe to be of independent interest. Our approach is based on a quantitative analysis of the original nonconstructive proof of Duminil-Copin and Hammond using ideas from proof theory.