All non-periodic points satisfy the Poisson limit law under exponential mixing

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Let ff be an exponentially mixing dynamical system, and let xx be a non-periodic point. Let yy be distributed according to the invariant measure μ\mu, and let dn(r)(x,y)d_n^{(r)}(x,y) denote the distance from xx to the rr-th closest point among the orbit segment {fk(y):k∈[1,n]}\{f^k(y):k\in[1,n]\}. Proposition (a) asserts that, for almost all xx, the number of visits of {fk(y)}k∈[1,τρ−d]\{f^k(y)\}_{k\in[1,\tau\rho^{-d}]} to B(x,ρ)B(x,\rho) converges to a Poisson distribution with parameter τγ(x)\tau\gamma(x) as ρ→0\rho\to0, and that the rescaled order statistics form a Poisson process.

Exponential-mixing conjecture. If ff is exponentially mixing, then the conclusion of Proposition (a) holds for all non-periodic points xx.

This would strengthen the almost-everywhere conclusion of Proposition (a) by identifying every non-periodic point as a point where the Poisson limit law holds. The supplied text gives no resolution of this question.

References

Primary source

Dmitry Dolgopyat, Bassam Fayad and Sixu Liu, “Multiple Borel Cantelli Lemma in dynamics and MultiLog law for recurrence”, arXiv:2103.08382 (2021).

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