2022
DOI: 10.21468/scipostphys.12.4.133
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Dynamic decay and superadiabatic forces in the van Hove dynamics of bulk hard sphere fluids

Abstract: We study the dynamical decay of the van Hove function of Brownian hard spheres using event-driven Brownian dynamics simulations and dynamic test particle theory. Relevant decays mechanisms include deconfinement of the self particle, decay of correlation shells, and shell drift. Comparison to results for the Lennard-Jones system indicates the generality of these mechanisms for dense overdamped liquids. We use dynamical density functional theory on the basis of the Rosenfeld functional with self interaction corr… Show more

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Cited by 5 publications
(11 citation statements)
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“…We have restricted our discussion to a single and relatively easily accessible type of nonequilibrium dynamics, that of stationary uniaxial compressional flow that represents a model steady (batch) sedimentation situation. The power functional approach allows to go much further, including the treatment of viscoelasticity [57], as arising from superadiabatic memory, deconfinement under shear [58], the dynamic decay of the van Hove pair correlation function as governed by drag, viscous and structural forces [69,70], and the complex forms of both flow and structural forces that arise under spatially complex forms of driving [60]. Time-dependent uniaxial flow is relevant in a variety of situations, including colloidal stratification [119,120] and sedimentation [121].…”
Section: Discussionmentioning
confidence: 99%
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“…We have restricted our discussion to a single and relatively easily accessible type of nonequilibrium dynamics, that of stationary uniaxial compressional flow that represents a model steady (batch) sedimentation situation. The power functional approach allows to go much further, including the treatment of viscoelasticity [57], as arising from superadiabatic memory, deconfinement under shear [58], the dynamic decay of the van Hove pair correlation function as governed by drag, viscous and structural forces [69,70], and the complex forms of both flow and structural forces that arise under spatially complex forms of driving [60]. Time-dependent uniaxial flow is relevant in a variety of situations, including colloidal stratification [119,120] and sedimentation [121].…”
Section: Discussionmentioning
confidence: 99%
“…The concept was originally formulated as an approximation within DDFT [63,64] and formally exactly within power functional theory [67]. Two-body superadiabatic effects were shown via simulation work to be significant [68][69][70] and they arise naturally in an exact formulation of the test particle dynamics [67]. The test particle limit allowed for a rationalization of the dynamical pair structure as e.g.…”
Section: Discussionmentioning
confidence: 99%
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