Abstract

We study models for a directed polymer in a random environment (DPRE) in which the polymer traverses a hierarchical diamond graph and the random environment is defined through random variables attached to the vertices. For these models, we prove a distributional limit theorem for the partition function in a limiting regime wherein the system grows as the coupling of the polymer to the random environment is appropriately attenuated. The sequence of diamond graphs is determined by a choice of a branching number b∈{2,3,…} and segmenting number s∈{2,3,…}, and our focus is on the critical case of the model where b=s. This extends recent work in the critical case of analogous models with disorder variables placed at the edges of the graphs rather than the vertices.

Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call