Sharkovskiis theorem under small random perturbations

Isabella Alvarenga; Daniel Miranda Machado

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arXiv · 2602.12397

Sharkovskiis theorem under small random perturbations

Isabella Alvarenga·Daniel Miranda Machado

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Abstract

We establish a Sharkovskii-type theorem for a class of discrete random dynamical systems via the random Conley index. Using the continuation property of the Conley index, we extend classical forcing results to random systems obtained from small random perturbations of one-dimensional maps. In contrast to earlier measure-theoretic results, which are typically subject to an inherent period-doubling ambiguity (realizing period $n$ or $2n$), our topological approach allows us to detect random periodic points and orbits with precise minimal periods. This yields realisation results for arbitrary finite tails of the Sharkovskii ordering. These results are illustrated by constructing random periodic orbits for perturbed versions of the tent map and the logistic map.

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Isabella Alvarenga, Daniel Miranda Machado. 2026-02-12. Sharkovskiis theorem under small random perturbations. https://arxiv.org/abs/2602.12397

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