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Pré-Publication, Document De Travail Année : 2017

Dimension Drop for Transient Random Walks on Galton-Watson Trees in Random Environments

Résumé

We prove that the dimension drop phenomenon holds for the harmonic measure associated to a transient random walk in a random environment (as defined by R. Lyons and R. Pemantle in 1992 and generalized by G. Faraud in 2011) on an infinite Galton-Watson tree without leaves. We use regeneration times and ergodic theory techniques from the work of R. Lyons, R. Pemantle and Y. Peres in 1996 to give an explicit construction of the invariant measure for the forward environment seen by the particule at exit times which is absolutely continuous with respect to the joint law of the tree and the path of the random walk.

Dates et versions

hal-04011862 , version 1 (02-03-2023)

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Pierre Rousselin. Dimension Drop for Transient Random Walks on Galton-Watson Trees in Random Environments. 2023. ⟨hal-04011862⟩
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