Rate of escape of conditioned Brownian motion
Abstract
We study the norm of the two-dimensional Brownian motion conditioned to stay outside the unit disk at all times. By conditioning the process is changed from barely recurrent to slightly transient. We obtain sharp results on the rate of escape to infinity of the process of future minima: (i) we find an integral test on the function so that the future minima process drops beyond the barrier at arbitrary large times; (ii) we show that the future minima process exceeds at arbitrary large times with probability 0 [resp., 1] if is larger [resp., smaller] than some positive constant. For this, we introduce a renewal structure attached to record times and values. Additional results are given for the long time behavior of the norm.
Keywords
Cite
@article{arxiv.2102.09636,
title = {Rate of escape of conditioned Brownian motion},
author = {Orphée Collin and Francis Comets},
journal= {arXiv preprint arXiv:2102.09636},
year = {2021}
}
Comments
31 pages, 1 figure. Second version