Dresden 2026 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 34: Focus Session: Emergent Transport in Active Systems (joint session DY/BP)

BP 34.7: Vortrag

Donnerstag, 12. März 2026, 17:30–17:45, ZEU/0160

Activity hallmarks in kinetic theory: Exceptional Points, Disorder Regularization, Non-Reciprocal Orientation-Displacement Coupling — •Horst-Holger Boltz and Thomas Ihle — University Greifswald, Institute for Physics, Greifswald

The dynamics of active systems are not subject to the same constraints as that of passive classical systems. This is particularly true for self-propelled particles with alignment interactions that have orientation-displacement coupling, i.e. the alignment is dependent on the relative position of the interacting particles to each other. We present recent work within first-principle kinetic theory that highlights key hallmarks of these more generalized dynamics. In particular, we discuss the effect of a cascade of exceptional points in the relevant dynamical operators under finite noise and also how to generally include noise in collision-based kinetic theory beyond mean-field. This allows us to provide analytical insights into the numerically established scaling relations (Kürsten, 2025) underlying the critical exponents in flocking transitions. Also, we are going to explain how to derive a systematic mesoscopic description for aligning self-propelled particles with orientation-displacement coupling and will present results showing a flocking transition in a system of a single species with purely anti-aligning torques and without any forces, simplifying an earlier reported flocking by turning-away mechanism (Das et al, 2024).

References: Boltz, Ihle, in preparation; Kürsten, arXiv:2402.18711 (2025); Das et al, Phys. Rev. X 14, 031008 (2024); Boltz et al, Entropy, 26(12), 1054 (2024); Ihle et al, arXiv:2303.03357 (2023)

Keywords: Active Matter; Excceptional Point; Kinetic Theory; Stochastic Dynamics