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dc.contributor.authorBorthne, Øyvind L
dc.contributor.authorFodor, Étienne
dc.contributor.authorCates, Michael E
dc.date.accessioned2020-12-22T18:54:09Z
dc.date.available2020-12-22T18:54:09Z
dc.date.issued2020-12-15
dc.date.submitted2020-08-05
dc.identifier.othernjpabcd66
dc.identifier.otherabcd66
dc.identifier.othernjp-112422.r1
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/315400
dc.descriptionFunder: ATTRACT Investigator Grant, Luxembourg National Research Fund Oppenheimer Research Fellowship, University of Cambridge
dc.descriptionFunder: Junior Research Fellowship, St Catharine's College
dc.descriptionFunder: Aker Scholarship
dc.description.abstractAbstract: We investigate the steady-state entropy production rate (EPR) in the hydrodynamic Vicsek model (HVM) and diffusive flocking model (DFM). Both models display a transition from an isotropic gas to a polar liquid (flocking) phase, in addition to travelling polar clusters and microphase-separation in the miscibility gap. The phase diagram of the DFM, which may be considered an extension of the HVM, contains additional structure at low densities where we find a novel crystal phase in which a stationary hexagonal lattice of high-density ridges surround low density valleys. From an assessment of the scaling of the EPR at low noise, we uncover that the dynamics in this limit may be organised into three main classes based on the dominant contribution. Truly nonequilibrium dynamics is characterised by a divergent EPR in this limit, and sustains global time-reversal symmetry (TRS) violating currents at zero noise. On the other hand, marginally nonequilibrium and effectively equilibrium dynamics have a finite EPR in this limit, and TRS is broken only at the level of fluctuations. For the latter of these two cases, detailed balance is restored in the small noise limit and we recover effective Boltzmann statistics to lowest nontrivial order. We further demonstrate that the scaling of the EPR may change depending on the dynamical variables that are tracked when it is computed, and the protocol chosen for time-reversal. Results acquired from numerical simulations of the dynamics confirm both the asymptotic scaling relations we derive and our quantitative predictions.
dc.languageen
dc.publisherIOP Publishing
dc.subjectPaper
dc.subjectentropy production
dc.subjectactive matter
dc.subjectflocking
dc.titleTime-reversal symmetry violations and entropy production in field theories of polar active matter
dc.typeArticle
dc.date.updated2020-12-22T18:54:08Z
prism.issueIdentifier12
prism.publicationNameNew Journal of Physics
prism.volume22
dc.identifier.doi10.17863/CAM.62507
dcterms.dateAccepted2020-11-24
rioxxterms.versionofrecord10.1088/1367-2630/abcd66
rioxxterms.versionVoR
rioxxterms.licenseref.urihttps://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidBorthne, Øyvind L [0000-0003-2690-8300]
dc.contributor.orcidFodor, Étienne [0000-0003-1372-2195]
dc.identifier.eissn1367-2630
pubs.funder-project-idH2020 European Research Council (740269)


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