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Nonequilibrium phenomena in driven and active Coulomb field theories

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  • Saeed, Mahdisoltani
  • Ramin, Golestanian

Abstract

The classical Coulomb gas model has served as one of the most versatile frameworks in statistical physics, connecting a vast range of phenomena across many different areas. Nonequilibrium generalisations of this model have so far been studied much more scarcely. With the abundance of contemporary research into active and driven systems, one would naturally expect that such generalisations of systems with long-ranged Coulomb-like interactions will form a fertile playground for interesting developments. Here, we present two examples of novel macroscopic behaviour that arise from nonequilibrium fluctuations in long-range interacting systems, namely (1) unscreened long-ranged correlations in strong electrolytes driven by an external electric field and the associated fluctuation-induced forces in the confined Casimir geometry, and (2) out-of-equilibrium critical behaviour in self-chemotactic models that incorporate the particle polarity in the chemotactic response of the cells. Both of these systems have nonlocal Coulomb-like interactions among their constituent particles, namely, the electrostatic interactions in the case of the driven electrolyte, and the chemotactic forces mediated by fast-diffusing signals in the case of self-chemotactic systems. The results presented here hint to the rich phenomenology of nonequilibrium effects that can arise from strong fluctuations in Coulomb interacting systems, and a rich variety of potential future directions, which are discussed.

Suggested Citation

  • Saeed, Mahdisoltani & Ramin, Golestanian, 2023. "Nonequilibrium phenomena in driven and active Coulomb field theories," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 631(C).
    • Handle: RePEc:eee:phsmap:v:631:y:2023:i:c:s0378437122006008
    DOI: 10.1016/j.physa.2022.127947
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    References listed on IDEAS

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