Dresden 2014 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 41: Poster - Pattern/ Nonlinear Dyn./ Fluids/ Granular/ Critical Phen.
DY 41.10: Poster
Thursday, April 3, 2014, 17:00–19:00, P3
Effects of empowerment-driven spins in the 2D-Ising model — •Lukas Everding1 and Daniel Polani2 — 1Ludwig-Maximilians-Universität, München/Deutschland — 2University of Hertfordshire, Hatfield/UK
Recent work has increasingly focussed on large-scale non-equilibrium systems. Especially interesting are systems which are pushed away from equilibrium by active ("driven") particles where the driving forces may arise from various principles. We specifically investigate large-scale systems with particles driven by a principle belonging to the class of ’intrinsic motivation’ drives called "empowerment". Empowerment-driven particles are given a limited freedom of choice in their behavior and they act with the goal of getting the largest possible perceivable influence onto the system, basically maximizing an information-theoretic criterion for combined controllability/observability. We investigate the effects of seeding a 2-d Ising model with a small number of empowerment-driven particles: using Monte-Carlo methods, we first show that these particles stabilize the system at finite magnetization, even well above the critical temperature. The system is dragged away from the unordered equilibrium state and kept in a more ordered state. Second, we show that the second-order phase transition of the classical Ising model at Tc is smoothed out to a slow and gradual transition from the ordered state to the unordered one with increasing temperature. An analogous effect is seen in a quite different Nagel-Schreckenberg model which indicates that empowerment-driven particles seem to push the bounds of ordered regimes into the disordered regimes.