Polar chiral active matter as a motile, disordered Josephson array: Information supercurrents and Goldstone spin waves
Phys. Rev. E 114, 035417 – Published 15 September, 2026
DOI: https://doi.org/10.1103/7y6z-4bwy
Abstract
We consider a minimalist model of polar chiral active matter: overdamped, self-propelled agents coupled through a localized Kuramoto-Sakaguchi interaction, which causes alignment. Intrinsic frustration drawn from a broad distribution constitutes a temperature for the ensemble. In the comoving frame of the local order parameter, the agent dynamics reduce exactly to the Adler equation, placing each agent in a tilted washboard potential: trapped agents are phase-synchronized, and we demonstrate thereby that synchronization (phase rigidity) is maintained by information supercurrents; agents that are running in this potential form a resistive bath. The model is therefore formally isomorphic to a disordered, resistively shunted Josephson array, and a Monte Carlo sweep over the frequency dispersion empirically recovers the disorder-broadened Adler-Ohmic crossover of the ensemble-averaged slip velocity. Lifting the dynamics from to , the polar alignment torque (the Kuramoto term) is geometrically equivalent to the Gilbert-damping term of the Landau-Lifshitz-Gilbert equation; the mapping establishes an effortless azimuthal precession, yielding a Goldstone-mode dispersion that carries an effective inertia , where is the local order parameter. This furnishes a microscopic basis for the spin-wave transport assumed in inertial-spin models of flocking. Within its regime of validity, i.e., dry, polar, chiral agents under marginal synchronization with sufficient frustration, the model is well-described as a dissipative spintronic fluid.
Physics Subject Headings (PhySH)
- Bifurcations
- Biological fluid dynamics
- Chaos
- Complex systems
- Critical current
- Critical phenomena
- Dynamical phase transitions
- Dynamics of networks
- Entropy
- Josephson effect
- Living matter & active matter
- Noise
- Noise-induced transitions
- Nonequilibrium & irreversible thermodynamics
- Nonequilibrium statistical mechanics
- Patterns in complex systems
- Phase separation
- Phase slips
- Phase transitions
- Self-organized criticality
- Self-organized systems
- Spin dynamics
- Superconducting phase transition
- Superconductivity
- Superfluid density
- Thermal properties
- Thermodynamics
- Transport phenomena
- Vortices in superfluids
- Wave chaos
- Superconductors
- Topological materials
- Approximation methods for many-body systems
- Chaos & nonlinear dynamics
- Data analysis
- Langevin equation
- Monte Carlo methods
- Numerical approximation & analysis
- Theories of collective dynamics & active matter
- Time series analysis
- Vicsek model
- XY model