Diffusion-mediated surface reactions and stochastic resetting
File(s)surface_resetR2.pdf (452.6 KB)
Accepted version
Author(s)
Bressloff, Paul C
Type
Journal Article
Abstract
In this paper, we investigate the effects of stochastic resetting on diffusion in ${\mathbb{R}}^{d}{\backslash}\mathcal{U}$, where $\mathcal{U}$ is a bounded obstacle with a partially absorbing surface $\partial \mathcal{U}$. We begin by considering a Robin boundary condition with a constant reactivity κ0, and show how previous results are recovered in the limits κ0 → 0, ∞. We then generalize the Robin boundary condition to a more general probabilistic model of diffusion-mediated surface reactions using an encounter-based approach. The latter considers the joint probability density or generalized propagator P(x, ℓ, t|x0) for the pair (Xt, ℓt) in the case of a perfectly reflecting surface, where Xt and ℓt denote the particle position and local time, respectively. The local time determines the amount of time that a Brownian particle spends in a neighborhood of the boundary. The effects of surface reactions are then incorporated via an appropriate stopping condition for the boundary local time. We construct the boundary value problem satisfied by the propagator in the presence of position resetting, and use this to derive implicit equations for the marginal density of particle position and the survival probability. We highlight the fact that these equations are difficult to solve in the case of non-constant reactivities, since resetting is not governed by a renewal process. We then consider a simpler problem in which both the position and local time are reset. In this case, the survival probability with resetting can be expressed in terms of the survival probability without resetting, which considerably simplifies the analysis. We illustrate the theory using the example of a spherically symmetric surface. In particular, we show that the effects of a partially absorbing surface on the mean first passage time (MFPT) for total absorption differs significantly if local time resetting is included. That is, the MFPT for a totally absorbing surface is increased by a multiplicative factor when the local time is reset, whereas the MFPT is increased additively when only particle position is reset.
Date Issued
2022-07-08
Date Acceptance
2022-03-25
Citation
Journal of Physics A: Mathematical and Theoretical, 2022, 55 (27)
ISSN
1751-8113
Publisher
IOP Publishing
Journal / Book Title
Journal of Physics A: Mathematical and Theoretical
Volume
55
Issue
27
Copyright Statement
Copyright © 2022 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article published in Journal of Physics A: Mathematical and Theoretical. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.1088/1751-8121/ac6138
Identifier
http://dx.doi.org/10.1088/1751-8121/ac6138
Publication Status
Published
Article Number
275002
Date Publish Online
2022-06-15