Irreversibility in scalar active turbulence: the role of topological defects [* Cross-Reference *]

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Byjesh N. Radhakrishnan; Francesco Serafin; Thomas L. Schmidt; Étienne Fodor, 2026, "Irreversibility in scalar active turbulence: the role of topological defects [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.UTMBMU, LIST Open Repository, V1
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Description
Abstract In many active systems, swimmers collectively stir the surrounding fluid to stabilize some self-sustained vortices. The resulting nonequilibrium state is often referred to as active turbulence. Although active turbulence clearly operates far from equilibrium, it can be challenging to pinpoint which emergent features primarily control the deviation from an equilibrium reversible dynamics. Here, we reveal that dynamical irreversibility essentially stems from singularities in the active stress. Specifically, considering the coupled dynamics of the swimmer density and the stream function, we demonstrate that the symmetries of vortical flows around defects determine the overall irreversibility. Our detailed analysis leads to identifying specific configurations of defect pairs as the dominant contribution to irreversibility. (2026-02-11)
***This entry has been automatically imported via OpenAlex by LIST harvest scripts. Please refer to https://doi.org/10.1088/1367-2630/ae44c3 for the original and latest version of the publication*** (2026-07-01)
Subject Astronomy and Astrophysics; Engineering; Physics
Keyword Non-equilibrium thermodynamics, Gravitational singularity, Scalar (mathematics), Topological defect, Homogeneous space, Turbulence, Active matter, Vortex
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