Recurrence conjecture for IID pp-rotor walks

Let p[0,1]p\in[0,1]. On Z2\mathbb{Z}^2, a pp-rotor walk is the walk in which, at each step, the rotor at the walker's current location is rotated 9090 degrees counterclockwise with probability pp and 9090 degrees clockwise with probability 1p1-p. Let ρ\rho be sampled from the IID uniform measure on {H,V}\{\operatorname{\mathcal{H}},\operatorname{\mathcal{V}}\}.

pp-rotor recurrence conjecture. For almost every such ρ\rho, the corresponding pp-rotor walk on Z2\mathbb{Z}^2 visits every vertex infinitely many times almost surely.

The claim extends the recurrence question across the full parameter range p[0,1]p\in[0,1], including the horizontal-vertical walk at p=12p=\tfrac12. The supplied text gives no resolution and explains that the methods in the paper are sensitive to changes in the model.

Sources & referencesView supporting material

Primary source

Swee Hong Chan, “Recurrence of horizontal-vertical walks”, arXiv:2012.10811 (2022).

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