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Interacting partially directed self avoiding walk. From phase transition to the geometry of the collapsed phase
P. Carmona, G. B. Nguyen, N. Pétrélis · 2013-06-20 · via math.PR updates on arXiv.org

In this paper, we investigate a model for a $1+1$ dimensional self-interacting and partially directed self-avoiding walk, usually referred to by the acronym IPDSAW. The interaction intensity and the free energy of the system are denoted by $β$ and $f$, respectively. The IPDSAW is known to undergo a collapse transition at $β_c$. We provide the precise asymptotic of the free energy close to criticality, that is we show that $f(β_c-ε)\sim γε^{3/2}$ where $γ$ is computed explicitly and interpreted in terms of an associated continuous model. We also establish some path properties of the random walk inside the collapsed phase $(β>β_c)$. We prove that the geometric conformation adopted by the polymer is made of a succession of long vertical stretches that attract each other to form a unique macroscopic bead, we identify the horizontal extension of the random walk inside the collapsed phase and we establish the convergence of the rescaled envelope of the macroscopic bead towards a deterministic Wulff shape.