Non-necessity of the recurrence criterion in dimension two

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Let feif_{e_i} denote the distance between consecutive points in coordinate direction eie_i, and let PP and E\mathbb{E} denote the law and expectation used for the discrete point process. For i∈{1,2}i\in\{1,2\} and N∈NN\in\mathbb{N}, consider the condition that there exists a constant C>0C>0 such that

∑k=N∞k P(fei=k)E(fei)≤CN.\sum_{k=N}^{\infty}\frac{k\,P(f_{e_i}=k)}{\mathbb{E}(f_{e_i})}\leq\frac{C}{N}.

Non-necessity conjecture. This condition, which is sufficient for recurrence of the two-dimensional random walk, is not necessary. The claim would show that recurrence can hold without the stated tail bound; the paper presents it as an open question in its partial classification of dimension two.

References

Primary source

Ron Rosenthal, “Random walk on discrete point processes”, arXiv:1005.1398 (2011).

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