SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 27: Statistical Physics: Far From Equilibrium I

DY 27.4: Vortrag

Mittwoch, 29. März 2023, 10:30–10:45, ZEU 250

Nonequilibrium mixture dynamics: A model for mobilities and its consequences — Maryam Akaberian, •Filipe Thewes, Peter Sollich, and Matthias Krüger — Institut für Theoretische Physik, Georg-August-Universität Göttingen, Göttingen, Germany

Extending the famous Model B for the time evolution of a liquid mixture, we develop an approximate approach for the mobility matrix that couples the different mixture components. This approach is based on a single component fluid with particles that are artificially grouped into colors and the relevant parameters can be determined from experiments or numerical simulations. We identify two distinct regimes, corresponding to collective motion and inter-diffusion, respectively, and show how they emerge from the microscopic properties of the fluid. As a test scenario, we study the dynamics after a thermal quench, providing a number insights from a Gaussian theory. Specifically, for systems with two or three components, analytical results for the time evolution of the equal time correlation function compare well to results of Monte Carlo simulations of a lattice gas. A rich behavior is observed, including the possibility of fractionation.