Nonequilibrium Response Theory for Soft and Active Matter

Explore a comprehensive lecture on nonequilibrium response theory for soft and active matter, delivered by Thomas Voigtmann at the Erwin Schrödinger International Institute for Mathematics and Physics. Delve into the statistical-physics approach used to describe colloidal suspensions and active particle systems through the integration-through transients (ITT) framework. Examine the fundamentals of nonequilibrium stochastic processes and learn about the derivation of exact equations for nonlinear response in these systems. Apply this knowledge to two distinct cases: Brownian particles under shear and active Brownian particles as representatives of biophysical model systems for collective effects in microswimmers like bacteria. Gain insights into the transition from microscopic descriptions to macroscopic flow laws in sheared systems. Conclude with an intriguing outlook on applications in rocket science. This 1 hour and 32 minute talk was part of the Graduate School on "Non-equilibrium Processes in Physics and Biology" held at ESI in August 2024.