Speaker
Description
This talk centers around the question to which extent measures of irreversibility in a nonequilibrium system serve as a signal of changes (transitions) in the dynamical behavior. We consider two examples. The first involves a single particle driven by repulsive time-delayed feedback. Recently it has been shown that this type of feedback can lead to persistent motion above a threshold in parameter space. We investigate, numerically and by analytical methods, the rate of heat production in the different regimes around the threshold to persistent motion. As function of delay time, the heat production rate shows a pronounced maximum close above the onset of persistent motion, whereas other parameter dependencies show no marked behavior. The distribution of dissipated heat is non-Gaussian at both sides of the transition.
The second example involves a many-particle system of active particles with non-reciprocal polar interactions. At strong coupling conditions, the system shows complex dynamical phase behavior that, on a hydrodynamic level, is characterized by exceptional points. We discuss consequences for the rate of entropy production on the particle level.
