Events

Date: 22 October 2026   Time: 13:00 - 14:00     

Location: MB-503

Nonreciprocal systems have recently received much interest in the statistical physics community and beyond. One intriguing feature of such systems is their unusual collective behavior including, e.g., spontaneous time-symmetry breaking. These phenomena have been widely studied using hydrodynamic theories, whereas the corresponding particle-level behavior if often less understood. This concerns, in particular, the behavior close to exceptional points appearing at strong nonreciprocity. Here we discuss the connection between field-theoretical and corresponding particle-level results for two types of systems: polar active matter [1,2] and the shepherding problem [3].

[1] K. L. Kreienkamp and S. H. L. Klapp, Phys. Rev. Lett. 133, 258303 (2024), PRE 110, 064135 (2024)
[2] K. L. Kreienkamp and S. H. L. Klapp, Comm. Phys. 8, 307 (2025)
[3] A. Lama, M. di Bernardo and S. H. L. Klapp, Nat. Comm. 16, 8450 (2025)