Abstract
We consider a particle moving in continuous time as a Markov jump process; its discrete chain is given by an ordinary random walk on , and its jump rate at is given by a fixed function φ of the state of a birth-and-death (BD) process at x, at time t; BD processes at different sites are independent and identically distributed, and φ is assumed non-increasing and vanishing at infinity. We derive a LLN and a CLT for the particle position when the environment is “strongly ergodic”. In the absence of a viable uniform lower bound for the jump rate, we resort instead to stochastic domination, as well as to a subadditive argument to control the time spent by the particle to perform n consecutive jumps; and we also impose conditions on the initial (product) environmental distribution.
Funding Statement
LRF partially supported by CNPq grant 307884/2019-8, and FAPESP grants 2017/10555-0 and 2015/00053-2; PAG supported by FAPESP grant 2020/02636-3; MAP supported by CNPq and CAPES institutional fellowships.
Acknowledgments
LRF warmly thanks Elena Zhizhina for many enjoyable discussions during a visit of hers to São Paulo, where this project originated. He also thanks Hubert Lacoin for bringing up the issue addressed in Remark 4.14. The authors thank anonymous referees for careful readings of a previous version of this article, and thoughtful comments and suggestions of improvement.
Citation
Luiz Renato Fontes. Pablo A. Gomes. Maicon A. Pinheiro. "Random walk in a birth-and-death dynamical environment." Electron. J. Probab. 28 1 - 26, 2023. https://doi.org/10.1214/23-EJP1060
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