Laplace’s first law of errors applied to diffusive motion

Omer Hamdi (), Stanislav Burov () and Eli Barkai ()
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Omer Hamdi: Bar-Ilan University
Stanislav Burov: Bar-Ilan University
Eli Barkai: Bar-Ilan University

The European Physical Journal B: Condensed Matter and Complex Systems, 2024, vol. 97, issue 6, 1-13

Abstract: Abstract In biological, glassy, and active systems, various tracers exhibit Laplace-like, i.e., exponential, spreading of the diffusing packet of particles. The limitations of the central limit theorem in fully capturing the behaviors of such diffusive processes, especially in the tails, have been studied using the continuous time random walk model. For cases when the jump length distribution is super-exponential, e.g., a Gaussian, we use large deviations theory and relate it to the appearance of exponential tails. When the jump length distribution is sub-exponential, the packet of spreading particles is described by the big jump principle. We demonstrate the applicability of our approach for finite time, indicating that rare events and the asymptotics of the large deviations rate function can be sampled for large length scales within a reasonably short measurement time. Graphical abstract The universality of Laplace tails appears everywhere

Date: 2024
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Citations: View citations in EconPapers (1)

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DOI: 10.1140/epjb/s10051-024-00704-5

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