Erratum: Origins and diagnostics of the nonequilibrium character of active systems (2018 <i>J. Stat. Mech</i>. 123201)

Dadhichi, Lokrshi Prawar; Maitra, Ananyo; Ramaswamy, Sriraṁ

doi:10.1088/1742-5468/ab02eb

Cited by 13 publications

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“…where the coefficient Λ aligns the polarisation vector with the local suspension velocity and is specific to systems in contact with a substrate [1,24,25]. We treat it as independent of the direction of p, which does not qualitatively modify our conclusions [26].…”

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Swimmer Suspensions on Substrates: Anomalous Stability and Long-Range Order

et al. 2020

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We present a comprehensive theory of the dynamics and fluctuations of a two-dimensional suspension of polar active particles in an incompressible fluid confined to a substrate. We show that, depending on the sign of a single parameter, a state with polar orientational order is anomalously stable (or anomalously unstable), with a nonzero relaxation (or growth) rate for angular fluctuations at zero wavenumber. This screening of the broken-symmetry mode in the stable state does lead to conventional rather than giant number fluctuations as argued by Bricard et al., Nature 503, 95 (2013), but their bend instability in a splay-stable flock does not exist and the polar phase has long-range order in two dimensions. Our theory also describes confined three-dimensional thin-film suspensions of active polar particles as well as dense compressible active polar rods, and predicts a flocking transition without a banding instability arXiv:1901.01069v1 [cond-mat.soft]

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Swimmer Suspensions on Substrates: Anomalous Stability and Long-Range Order

et al. 2020

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“…Biological systems and their artificial analogues convert chemical energy into mechanical work at the scale of individual constituents [1,2]. This breaking of detailed balance at the microscopic scale results in macroscopic stresses and currents [3][4][5][6][7] that have been shown to singularly modify the phase behaviour of such "active systems" relative to their passive, equilibrium counterparts.…”

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Active uniaxially ordered suspensions on disordered substrates

Maitra

2020

Phys. Rev. E

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Multiple experiments on active systems consider oriented active suspensions on substrates or in chambers confined along one direction. The theories of polar and apolar phases in such geometries were considered in A. Maitra et al, arXiv 1901.01069 and A. Maitra et al., PNAS 115, 6934 (2018) respectively. However, the presence of quenched random disorder due to the substrate cannot be completely eliminated in many experimental contexts possibly masking the predictions from those theories. In this paper, I consider the effect of quenched orientational disorder on the phase behaviour of both polar and apolar suspensions on substrates. I show that polar suspensions have long-range order in two dimensions with anomalous number fluctuations, while their apolar counterparts have only short range order, albeit with a correlation length that can increase with activity, and even more violent number fluctuations than active nematics without quenched disorder. These results should be of value in interpreting experiments on active suspensions on substrates with random disorder.

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“…Recently, a nonequilibrium equality was derived by Harada and Sasa which connects the response function and the correlation function [46,83]:…”

Section: Energy Dissipation In Active Bathmentioning

confidence: 99%

“…However, theoretical as well as experimental studies on colloidal bead in a bacterial bath to measure active dissipation by force-position correlation is still lacking. In addition, studies based on stochastic thermodynamics for active matter emphasize entropy production as the measure of extracting information from non-equilibrium fluctuations [40][41][42][43][44][45][46][47]. A Clausius inequality concerning this has also been proposed [48,49].…”

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confidence: 99%

Effects of active fluctuations on energetics of a colloidal particle: Superdiffusion, dissipation and entropy production

Chaki

Chakrabarti

2019

Physica A: Statistical Mechanics and its Applications

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I. ABSTRACTWe consider a colloidal particle immersed in an active bath and derive a Smoluchowski equation that governs the dynamics of colloidal particle. We address this as active Smoluchowski equation. Our analysis based on this active Smoluchowski equation shows a short timesuperdiffusive behavior that strongly depends on the activity. Our model also predicts a non-monotonic dependence of mean energy dissipation against time, a signature of activityinduced dynamics. By introducing a frequency-dependent effective temperature, we show that the mean rate of entropy production is time dependent unlike a thermal system. The prime reason for these anomalies is the absence of any fluctuation-dissipation theorem for the active noise. We also comment on how microscopic details of activity can reverse the trends for mean energy dissipation and mean rate of entropy production.

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Erratum: Origins and diagnostics of the nonequilibrium character of active systems (2018 J. Stat. Mech. 123201)

Cited by 13 publications

References 0 publications

Swimmer Suspensions on Substrates: Anomalous Stability and Long-Range Order

Swimmer Suspensions on Substrates: Anomalous Stability and Long-Range Order

Active uniaxially ordered suspensions on disordered substrates

Effects of active fluctuations on energetics of a colloidal particle: Superdiffusion, dissipation and entropy production

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