English

Recurrence of horizontal-vertical walks

Probability 2023-05-11 v3 Combinatorics

Abstract

Consider a nearest neighbor random walk on the two-dimensional integer lattice, where each vertex is initially labeled either `H' or `V', uniformly and independently. At each discrete time step, the walker resamples the label at its current location (changing `H' to `V' and `V' to `H' with probability qq). Then, it takes a mean zero horizontal step if the new label is `H', and a mean zero vertical step if the new label is `V'. This model is a randomized version of the deterministic rotor walk, for which its recurrence (i.e., visiting every vertex infinitely often with probability 1) in two dimensions is still an open problem. We answer the analogous question for the the horizontal-vertical walk, by showing that the horizontal-vertical walk is recurrent for q(13,1]q \in (\frac{1}{3},1].

Keywords

Cite

@article{arxiv.2012.10811,
  title  = {Recurrence of horizontal-vertical walks},
  author = {Swee Hong Chan},
  journal= {arXiv preprint arXiv:2012.10811},
  year   = {2023}
}

Comments

33 pages, 3 figures. Extra references added. To appear in Ann. Inst. Henri Poincar\'e Probab. Stat

R2 v1 2026-06-23T21:06:12.193Z