Conservation laws and slow dynamics determine the universality class of interfaces in active matter

Abstract

While equilibrium interfaces display universal large-scale statistics, interfaces in phase-separated active and driven systems are predicted to belong to distinct non-equilibrium universality classes. Yet, such behavior has proven difficult to observe, with most systems exhibiting equilibrium-like fluctuations despite their strongly non-equilibrium microscopic dynamics. We introduce a hard-disk model driven by active collisions, conceived as an effective 2D description of a vibrofluidized granular system that, contrary to self-propelled models, displays clear non-equilibrium interfacial scaling. We observe for the first time, the $|\mathbf{q}|$KPZ and wet-$|\mathbf{q}|$KPZ universality classes while revealing a new, previously overlooked universality class arising in systems with slow solid-like or glassy dynamics. Conservation laws and slow dynamics select these distinct classes.

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References in corpus (54)

• Universal Fluctuations of Growing Interfaces: Evidence in Turbulent Liquid Crystals
• Full phase diagram of active Brownian disks: from melting to motility-induced phase separation
• Spontaneous velocity alignment in Motility-induced Phase Separation
• Negative interfacial tension in phase-separated active suspensions
• Active colloidal suspensions: Clustering and phase behavior
• Irreversibility and biased ensembles in active matter: Insights from stochastic thermodynamics
• Time-(ir)reversibility in active matter: from micro to macro
• Non-equilibrium and information: the role of cross-correlations
• Dynamics of active liquid interfaces
• Phase Diagram of Active Brownian Spheres: Crystallization and the Metastability of Motility-Induced Phase Separation
• Noise, diffusion, and hyperuniformity
• Traveling fronts in active-passive particle mixtures
• Active particles under confinement: Aggregation at the wall and gradient formation inside a channel
• The propagation of active-passive interfaces in bacterial swarms
• Capillary interfacial tension in active phase separation
• Curvature-dependent tension and tangential flows at the interface of motility-induced phases
• Nonlinear modes disentangle glassy and Goldstone modes in structural glasses
• A review of active matter reviews
• Non-Equilibrium Surface Tension of the Vapour-Liquid Interface of Active Lennard-Jones Particles
• Hydrodynamic modes in a confined granular fluid
• Stealth entropy production in active field theories near Ising critical points
• Hydrodynamically interrupted droplet growth in scalar active matter
• Active phase separation: new phenomenology from non-equilibrium physics
• Classical Nucleation Theory for Active Fluid Phase Separation
• Self-organization of primitive metabolic cycles due to non-reciprocal interactions
• Interface stability, interface fluctuations, and the Gibbs-Thomson relation in motility-induced phase separations
• Nucleation pathway and kinetics of phase-separating active Brownian particles
• Interface Fluctuations, Burgers Equations, and Coarsening under Shear
• Inference in non-equilibrium systems from incomplete information: the case of linear systems and its pitfalls
• Strong coupling in conserved surface roughening: A new universality class?
• Capillary-like Fluctuations of a Solid-Liquid Interface in a Non-Cohesive Granular System
• Fingering Instability of Active Nematic Droplets
• Propagation of active nematic-isotropic interfaces on substrates
• Interface roughening in nonequilibrium phase-separated systems
• Active interface polarization is a state function
• Theory of Capillary Tension and Interfacial Dynamics of Motility-Induced Phases
• Interface height fluctuations and surface tension of driven liquids with time-dependent dynamics
• Non-equilibrium dynamic hyperuniform states
• Effective two-dimensional model for granular matter with phase separation
• Asymmetric fluctuations and self-folding of active interfaces
• From bulk descriptions to emergent interfaces: connecting the Ginzburg-Landau and elastic line models
• A simple and accurate method to determine fluid-crystal phase boundaries from direct coexistence simulations
• Traveling waves at the surface of active liquid crystals
• Hyperuniformity and conservation laws in non-equilibrium systems
• The Mechanics of Nucleation and Growth and the Surface Tensions of Active Matter
• Non-equilibrium coexistence between a fluid and a hotter or colder crystal of granular hard disks
• Hyperuniform interfaces in non-equilibrium phase coexistence
• Interface dynamics of wet active systems
• Self-assembly and non-equilibrium phase coexistence in a binary granular mixture
• Phase Separation, Capillarity, and Odd Surface Flows in Chiral Active Matter
• Roughening of two-dimensional interfaces in nonequilibrium phase-separated systems
• Dynamical and structural properties of an absorbing phase transition: a case study from granular systems
• Interfacial and density fluctuations in a lattice model of motility-induced phase separation
• Effects of curvature on growing films of microorganisms