Dresden 2026 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 43: Poster: Statistical Physics

DY 43.22: Poster

Wednesday, March 11, 2026, 15:00–18:00, P5

Critical behaviour of non-reciprocal Ising models — •Max Haessler and Martin Weigel — TU Chemnitz Institut für Physik, Chemnitz, Germany

Equilibrium statistical physics is based on symmetric, Hamiltonian interactions fulfilling Newton*s Third Law. On the other hand, active matter like bacteria or bird flocks, predator-prey relations in nature and social systems violate time-reversal symmetry due to non-reciprocal interactions, hence they are non-equilibrium systems.

We try to investigate the fundamental mechanisms that govern such systems by investigating non-reciprocal modifications of the Ising model.

We especially focus on investigating the impact of the non-reciprocal interactions on the critical behaviour of those models.

Keywords: non-reciprocal; non-equilibrium; phase transition; Ising model; critical exponents