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Stationary entrance chains and applications to random walks

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  • Mijatović, Aleksandar
  • Vysotsky, Vladislav

Abstract

For a Markov chain Y with values in a Polish space, consider the entrance chain obtained by sampling Y at the moments when it enters a fixed set A from its complement Ac. Similarly, consider the exit chain, obtained by sampling Y at the exit times from Ac to A. We use the method of inducing from ergodic theory to study invariant measures of these two types of Markov chains in the case when the initial chain Y has a known invariant measure. We give explicit formulas for invariant measures of the entrance and exit chains under certain recurrence-type assumptions on A and Ac, which apply even for transient chains. Then we study uniqueness and ergodicity of these invariant measures assuming that Y is topologically recurrent, topologically irreducible, and weak Feller.

Suggested Citation

  • Mijatović, Aleksandar & Vysotsky, Vladislav, 2025. "Stationary entrance chains and applications to random walks," Stochastic Processes and their Applications, Elsevier, vol. 188(C).
  • Handle: RePEc:eee:spapps:v:188:y:2025:i:c:s0304414925001097
    DOI: 10.1016/j.spa.2025.104668
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    References listed on IDEAS

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    1. Mijatović, Aleksandar & Uribe Bravo, Gerónimo, 2022. "Limit theorems for local times and applications to SDEs with jumps," Stochastic Processes and their Applications, Elsevier, vol. 153(C), pages 39-56.
    2. Vysotsky, Vladislav, 2010. "On the probability that integrated random walks stay positive," Stochastic Processes and their Applications, Elsevier, vol. 120(7), pages 1178-1193, July.
    3. Alexander Bendikov & Wojciech Cygan, 2015. "On massive sets for subordinated random walks," Mathematische Nachrichten, Wiley Blackwell, vol. 288(8-9), pages 841-853, June.
    Full references (including those not matched with items on IDEAS)

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