Abstract
We consider one infinite path of a Random Walk in Random Environment (RWRE, for short) in an unknown environment. This environment consists of either i.i.d. site or bond randomness. At each position the random walker stops and tells us the environment it sees at the point where it is, without telling us, where it is. These observations are spoiled by reading errors that occur with probability . We show: If the RWRE is recurrent and satisfies the standard assumptions on such RWREs, then with probability one in the environment, the errors, and the random walk we are able reconstruct the law of the environment. For most situations this result is even independent of the value of p. If the distribution of the environment has a non-atomic part, we can even reconstruct the environment itself, up to translation.
Funding Statement
Research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy EXC 2044-390685587, Mathematics Münster: Dynamics-Geometry-Structure. JJ is funded by the DFG through the SPP 2265 Random Geometric Systems
Acknowledgments
We are grateful to Nina Gantert for many hints on the behavior of RWRE. We also thank an anonymous referee and and anonymous Associate Editor for many useful remarks that spotted a mistake in the first version and helped to improve the paper.
Citation
Jonas Jalowy. Matthias Löwe. "Reconstructing a recurrent random environment from a single trajectory of a Random Walk in Random Environment with errors." Electron. Commun. Probab. 26 1 - 12, 2021. https://doi.org/10.1214/21-ECP425
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