Daniele Carichini
Non-reciprocal interactions in flocking models.
Rel. Alessandro Pelizzola, Alexandre Solon. Politecnico di Torino, Corso di laurea magistrale in Physics Of Complex Systems (Fisica Dei Sistemi Complessi), 2025
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Abstract
Active matter is a field within out-of-equilibrium statistical physics that studies systems at the microscopic scale capable of converting ambient energy into self-propulsion or other forms of mechanical motion. The Vicsek model (VM), which describes the transition to collective motion in self-propelled particles, serves as a paradigmatic example in this discipline. Known for its simplicity and numerical tractability, the VM effectively captures the onset of flocking behavior. While fundamental forces must obey Newton’s action-reaction principle, effective descriptions of active matter systems often involve reciprocity-breaking interactions, especially at the mesoscopic level, where such interactions may be more the rule than the exception.
A striking consequence of non-reciprocal (NR) interactions in two-species systems is the emergence of chiral phases
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