Hydrodynamic interactions between colloids in a wormlike micelle solution are memory-dependent, with a long-lived flow reversal after cessation that standard continuum models fail to capture.
Causality for nonlocal phenomena
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Drawing from the theory of optimal transport we propose a rigorous notion of a causal relation for Borel probability measures on a given spacetime. To prepare the ground, we explore the borderland between causality, topology and measure theory. We provide various characterisations of the proposed causal relation, which turn out to be equivalent if the underlying spacetime has a sufficiently robust causal structure. We also present the notion of the 'Lorentz-Wasserstein distance' and study its basic properties. Finally, we discuss how various results on causality in quantum theory, aggregated around Hegerfeldt's theorem, fit into our framework.
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Colloidal hydrodynamic interactions in viscoelastic fluids
Hydrodynamic interactions between colloids in a wormlike micelle solution are memory-dependent, with a long-lived flow reversal after cessation that standard continuum models fail to capture.