Equidistribution conjecture for unstable periodic points of heterochaos baker maps

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Let (a,b)∈Δ(a,b)\in\Delta, let ff be the corresponding heterochaos baker map on [0,1]3[0,1]^3, and let μα\mu_\alpha and μβ\mu_\beta be the two ergodic measures of maximal entropy. Denote by Fix⁡α(fn)\operatorname{Fix}_\alpha(f^n) and Fix⁡β(fn)\operatorname{Fix}_\beta(f^n) the sets of α\alpha- and β\beta-type fixed points of fnf^n. For every continuous function ϕ ⁣:[0,1]3→R\phi\colon[0,1]^3\to\mathbb R, Equidistribution conjecture. For any (a,b)∈Δ(a,b)\in\Delta and any continuous function ϕ ⁣:[0,1]3→R\phi\colon[0,1]^3\to\mathbb R,

lim⁡n→∞1#Fix⁡α(fn)∑x∈Fix⁡α(fn)ϕ(x)=∫ϕ dμα\lim_{n\to\infty}\frac{1}{\#\operatorname{Fix}_{\alpha}(f^n)}\sum_{x\in\operatorname{Fix}_{\alpha}(f^n)}\phi(x)=\int\phi\,\mathrm d\mu_{\alpha}

and

lim⁡n→∞1#Fix⁡β(fn)∑x∈Fix⁡β(fn)ϕ(x)=∫ϕ dμβ.\lim_{n\to\infty}\frac{1}{\#\operatorname{Fix}_{\beta}(f^n)}\sum_{x\in\operatorname{Fix}_{\beta}(f^n)}\phi(x)=\int\phi\,\mathrm d\mu_{\beta}.

This predicts that the two unstable periodic-point populations equidistribute toward the two ergodic measures of maximal entropy.

References

Primary source

Yoshitaka Saiki, Hiroki Takahasi, Kenichiro Yamamoto and James A. Yorke, “The dynamics of the heterochaos baker maps”, arXiv:2401.00836 (2024).

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