First-Passage Duality

Abstract

We show that the distribution of times for a diffusing particle to first hit an absorber is \emph{independent} of the direction of an external flow field, when we condition on the event that the particle reaches the target for flow away from the target. Thus, in one dimension, the average time for a particle to travel to an absorber a distance $\ell$ away is $\ell /|v|$, independent of the sign of $v$. This duality extends to all moments of the hitting time. In two dimensions, the distribution of first-passage times to an absorbing circle in the radial velocity field $v(r)=Q/(2\pi r)$ again exhibits duality. Our approach also gives a new perspective on how varying the radial velocity is equivalent to changing the spatial dimension, as well as the transition between transience and strong transience in diffusion.

12 pages, 1 figure, IOP format. Updated version has minor changes in response to referees. Latest version: various minor typos fixed. For publication in JSTAT. Updated version in 2024: fixed minor errors in Eq. (2b)

References in corpus (3)

• First-passage times in complex scale-invariant media
• Universal formula for the mean first passage time in planar domains
• Probing Non-Integer Dimensions

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