Random walk on the range of random walk

DA Croydon - Journal of Statistical Physics, 2009 - Springer
Journal of Statistical Physics, 2009Springer
We study the random walk X on the range of a simple random walk on ℤ d in dimensions
d≥ 4. When d≥ 5 we establish quenched and annealed scaling limits for the process X,
which show that the intersections of the original simple random walk path are essentially
unimportant. For d= 4 our results are less precise, but we are able to show that any scaling
limit for X will require logarithmic corrections to the polynomial scaling factors seen in higher
dimensions. Furthermore, we demonstrate that when d= 4 similar logarithmic corrections are …
Abstract
We study the random walk X on the range of a simple random walk on ℤ d in dimensions d≥4. When d≥5 we establish quenched and annealed scaling limits for the process X, which show that the intersections of the original simple random walk path are essentially unimportant. For d=4 our results are less precise, but we are able to show that any scaling limit for X will require logarithmic corrections to the polynomial scaling factors seen in higher dimensions. Furthermore, we demonstrate that when d=4 similar logarithmic corrections are necessary in describing the asymptotic behavior of the return probability of X to the origin.
Springer
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