The crossing probability for directed polymers in random media

TL;DR

This paper investigates the probability that two directed polymers in a random medium do not intersect, using the replica method and the Lieb-Liniger model, providing analytical results and numerical comparisons.

Contribution

It introduces a novel analytical approach to compute non-crossing probabilities of directed polymers using the replica method and the Lieb-Liniger model.

Findings

Derived analytical expressions for moments of non-crossing probabilities.

Numerical simulations confirm the analytical results at high temperature.

Conjectured large-time behaviors of non-crossing probabilities.

Abstract

We study the probability that two directed polymers in the same random potential do not intersect. We use the replica method to map the problem onto the attractive Lieb-Liniger model with generalized statistics between particles. We obtain analytical expressions for the first few moments of this probability, and compare them to a numerical simulation of a discrete model at high-temperature. From these observations, several large time properties of the non-crossing probabilities are conjectured. Extensions of our formalism to more general observables are discussed.