Non-necessity of the recurrence criterion in dimension two
Let denote the distance between consecutive points in coordinate direction , and let and denote the law and expectation used for the discrete point process. For and , consider the condition that there exists a constant such that
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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