Switching diffusions and stochastic resetting
File(s)resetsw.pdf (1.13 MB)
Accepted version
Author(s)
Bressloff, Paul C
Type
Journal Article
Abstract
We consider a Brownian particle that switches between two different diffusion states (D0, D1) according to a two-state Markov chain. We further assume that the particle's position is reset to an initial value Xr at a Poisson rate r, and that the discrete diffusion state is simultaneously reset according to the stationary distribution ρn, n = 0, 1, of the Markov chain. We derive an explicit expression for the non-equilibrium steady state (NESS) on $\mathbb{R}$, which is given by the sum of two decaying exponentials. In the fast switching limit the NESS reduces to the exponential distribution of pure diffusion with stochastic resetting. The effective diffusivity is given by the mean $\overline{D}={\rho }_{0}{D}_{0}+{\rho }_{1}{D}_{1}$. We then determine the mean first passage time (MFPT) for the particle to be absorbed by a target at the origin, having started at the reset position Xr > 0. We proceed by calculating the survival probability in the absence of resetting and then use a last renewal equation to determine the survival probability with resetting. Similar to the NESS, we find that the MFPT depends on the sum of two exponentials, which reduces to a single exponential in the fast switching limit. Finally, we show that the MFPT has a unique minimum as a function of the resetting rate, and explore how the optimal resetting rate depends on other parameters of the system.
Date Issued
2020-07-10
Date Acceptance
2020-05-29
Citation
Journal of Physics A: Mathematical and Theoretical, 2020, 53 (27)
ISSN
1751-8113
Publisher
IOP Publishing
Journal / Book Title
Journal of Physics A: Mathematical and Theoretical
Volume
53
Issue
27
Copyright Statement
Copyright © 2020 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/ab97e0
Identifier
http://dx.doi.org/10.1088/1751-8121/ab97e0
Publication Status
Published
Article Number
275003
Date Publish Online
2020-06-18