Non-reciprocal alignment induces asymmetric clustering in active mixtures
arxiv(2024)
摘要
Heterogeneity is ubiquitous in biological and synthetic active matter systems
that are inherently out of equilibrium. Typically, such active mixtures involve
not only conservative interactions between the constituents, but also
non-reciprocal couplings, whose full consequences for the collective behavior
still remain elusive. Here, we study a minimal active non-reciprocal mixture
with both, symmetric isotropic and non-reciprocal polar interactions. By
combining a hydrodynamic theory derived from microscopic equations and
particle-based simulations, we provide a scale-bridging view on the rich
dynamics that occur even in absence of oscillatory instabilities. We show, in
particular, that non-reciprocal alignment alone induces asymmetrical clustering
at otherwise fully symmetric parameters. These density inhomogeneities go
beyond the typical band formation in Vicsek-like systems. Within the asymmetric
clustering state, single-species clusters chase more dilute accumulations of
the other species.
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