Regensburg 2019 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 22: Critical Phenomena and Phase Transitions
DY 22.5: Talk
Tuesday, April 2, 2019, 15:00–15:15, H19
Nonequilibrium dynamics of the critical Casimir force — •Markus Gross1,2, Andrea Gambassi3, and Siegfried Dietrich1,2 — 1MPI für Intelligente Systeme, Stuttgart — 2IV. Institut für Theoretische Physik, Universität Stuttgart — 3SISSA - International School for Advanced Studies and INFN, Trieste, Italy
We discuss how the critical Casimir force, primarily investigated in equilibrium conditions, can be determined as function of time for a general Landau-Ginzburg model. We focus here on the conserved dynamics of a fluid in film geometry, described by the equations of the so-called `model B'. Specifically, we analyze the nonequilibrium time-evolution following a rapid quench from an initial homogeneous high-temperature state to the critical temperature. Concerning the behavior at the walls bounding the film, we assume that the fluid order parameter (e.g., concentration or density) shows a strong preferential adsorption -- a behavior which is typically observed in experiments. The resulting dynamics of the order parameter and the critical Casimir force are discussed within analytical as well as numerical approaches.
Ref.: M. Gross, A. Gambassi, S. Dietrich, Phys. Rev. E 98, 032103 (2018)