2022/11/24 by Moumita Dasgupta, Dasgupta, Moumita, Sougata Guha +7 · 1 citation
Biochemistry, Genetics and Molecular Biology · Mathematics · Social Sciences · #Biological Physics (physics.bio-ph) #Diffusion and Search Dynamics #Evolutionary Game Theory and Cooperation #FOS: Physical sciences #Soft Condensed Matter (cond-mat.soft) #Statistical Mechanics (cond-mat.stat-mech) #Stochastic processes and statistical mechanics
paper · pdf · doi:10.48550/arxiv.2211.13814
openalex publication_date 2022/11/24 · openalex created_date 2022/11/30 · openalex updated_date 2026/07/28
Intuition suggests that passage times across a region increases with the number of barriers along the path. Can this fail depending on the nature of the barrier? To probe this fundamental question, we exactly solve for the first passage time in general d-dimensions for diffusive transport through a spatially patterned array of obstacles - either entropic or energetic, depending on the nature of the obstacles. For energetic barriers, we show that first passage times vary non-monotonically with the number of barriers, while for entropic barriers it increases monotonically. This non-monotonicity for energetic barriers further reflects in the behaviour of effective diffusivity as well. We then design a simple experiment where a robotic bug navigates a heterogeneous environment through a spatially patterned array of obstacles to validate our predictions. Finally, using numerical simulations, we show that this non-monotonic behaviour for energetic barriers is general and extends to even super-diffusive transport.