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Directed landscape convergence for the half-space log-gamma polymer $N^{2/3+\delta}$ away from the boundary

Probability 2026-03-02 v1

Abstract

We prove that the free energy of the half-space log-gamma polymer N2/3+δN^{2/3+\delta} away from the boundary in the non-attractive regime converges to the directed landscape. Based on the convergence of the full-space log-gamma free energy to the directed landscape, we couple the full-space and the half-space model and prove that the dominant contributions to free energy in both cases come from paths that remain confined to a transversal window of order N2/3N^{2/3}. The result follows from three main inputs: a deterministic leading-order gap between paths that deviate from the transversal window on the N2/3+δN^{2/3+\delta} scale and those within the typical N2/3N^{2/3} scale; uniform exponential upper-tail bounds for half-space free energies with general slope; and existing full-space estimates on constrained and exiting free energies.

Keywords

Cite

@article{arxiv.2602.23549,
  title  = {Directed landscape convergence for the half-space log-gamma polymer $N^{2/3+\delta}$ away from the boundary},
  author = {Xinyi Zhang},
  journal= {arXiv preprint arXiv:2602.23549},
  year   = {2026}
}

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