Boundary layers, transport and universal distribution in boundary driven active systems

Fuente: arXiv
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Main Authors: Dolai, Pritha, Das, Arghya
Format: Preprint
Published: 2024
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author Dolai, Pritha
Das, Arghya
author_facet Dolai, Pritha
Das, Arghya
contents We discuss analytical results for a run-and-tumble particle (RTP) in one dimension in presence of boundary reservoirs. It exhibits `kinetic boundary layers', nonmonotonous distribution, current without density gradient, diffusion facilitated current reversal and optimisation on tuning dynamical parameters, and a new transport effect in the steady state. The spatial and internal degrees of freedom together possess a symmetry, using which we find the eigenspectrum for large systems. The eigenvalues are arranged in two bands which can mix in certain conditions resulting in a crossover in the relaxation. The late time distribution for large systems is obtained analytically; it retains a strong and often dominant `active' contribution in the bulk rendering an effective passive-like description inadequate. A nontrivial `Milne length' also emerges in the dynamics. Finally, a novel universality is proposed in the absorbing boundary problem for dynamics with short-range colored noise. Active processes driven by active reservoirs may thus provide a common physical ground for diverse and new nonequilibrium phenomena.
format Preprint
id arxiv_https___arxiv_org_abs_2412_20287
institution arXiv
publishDate 2024
record_format arxiv
spellingShingle Boundary layers, transport and universal distribution in boundary driven active systems
Dolai, Pritha
Das, Arghya
Statistical Mechanics
Soft Condensed Matter
We discuss analytical results for a run-and-tumble particle (RTP) in one dimension in presence of boundary reservoirs. It exhibits `kinetic boundary layers', nonmonotonous distribution, current without density gradient, diffusion facilitated current reversal and optimisation on tuning dynamical parameters, and a new transport effect in the steady state. The spatial and internal degrees of freedom together possess a symmetry, using which we find the eigenspectrum for large systems. The eigenvalues are arranged in two bands which can mix in certain conditions resulting in a crossover in the relaxation. The late time distribution for large systems is obtained analytically; it retains a strong and often dominant `active' contribution in the bulk rendering an effective passive-like description inadequate. A nontrivial `Milne length' also emerges in the dynamics. Finally, a novel universality is proposed in the absorbing boundary problem for dynamics with short-range colored noise. Active processes driven by active reservoirs may thus provide a common physical ground for diverse and new nonequilibrium phenomena.
title Boundary layers, transport and universal distribution in boundary driven active systems
topic Statistical Mechanics
Soft Condensed Matter
url https://arxiv.org/abs/2412.20287