Inertial effects of self-propelled particles: From active Brownian to active Langevin motion.
TL;DR: In this paper, the authors summarized recent developments of active particles with inertia (i.e., microflyers, hop-flies, or runners) for single particle properties and for collective effects of many particles.
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Abstract: Active particles that are self-propelled by converting energy into mechanical motion represent an expanding research realm in physics and chemistry. For micrometer-sized particles moving in a liquid (“microswimmers”), most of the basic features have been described by using the model of overdamped active Brownian motion. However, for macroscopic particles or microparticles moving in a gas, inertial effects become relevant such that the dynamics is underdamped. Therefore, recently, active particles with inertia have been described by extending the active Brownian motion model to active Langevin dynamics that include inertia. In this perspective article, recent developments of active particles with inertia (“microflyers,” “hoppers,” or “runners”) are summarized both for single particle properties and for collective effects of many particles. These include inertial delay effects between particle velocity and self-propulsion direction, tuning of the long-time self-diffusion by the moment of inertia, effects of fictitious forces in noninertial frames, and the influence of inertia on motility-induced phase separation. Possible future developments and perspectives are also proposed and discussed.
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Citations
The physics of active polymers and filaments
TL;DR: The theoretical models for tangentially and isotropically self-propelled or active-bath-driven polymers are presented, both in the presence and absence of hydrodynamic interactions, and the consequences for their conformational and dynamical properties are examined.
112
Inertial self-propelled particles.
TL;DR: The study of the correlations in the underdamped regime of the active Ornstein-Uhlenbeck model is extended to the case of a chain of active particles interacting via harmonic springs and reveals the existence of marked equal-time correlations between velocity and active force in the non-equilibrium steady state.
85
The physics of active polymers and filaments
TL;DR: In this paper, the theoretical models for tangentially and isotropically self-propelled or active-bath-driven polymers are presented, both in the presence and absence of hydrodynamic interactions.
62
Effective temperatures in inhomogeneous passive and active bidimensional Brownian particle systems.
TL;DR: The study of the globally averaged properties is complemented with the theoretical and numerical characterization of the fluctuation distributions of the single-particle diffusion, linear response, and effective temperature in the homogeneous and inhomogeneous phases.
60
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TL;DR: In this article, a model of non-aligning self-propelled particles interacting through steric repulsion was studied, which was recently shown to exhibit active phase separation in two dimensions in the absence of any attractive interaction or breaking of the orientational symmetry.
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Dynamics of Self-Propelled Janus Particles in Viscoelastic Fluids
TL;DR: It is shown that this effect gives rise to a highly anisotropic response of microswimmers in viscoelastic media to external forces, depending on its orientation, which can be phenomenologically described by an effective rotational diffusion coefficient dependent on the Weissenberg number.
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Christoph Weber,Timo Hanke,J. Deseigne,Sébastien Léonard,Olivier Dauchot,Olivier Dauchot,Erwin Frey,Hugues Chaté,Hugues Chaté +8 more
TL;DR: This work presents a model reproducing quantitatively the single, binary, and collective properties of this granular system usingibrated polar disks, and shows in silico that true long-range order is possible in the experimental system.
Brownian motion of a self-propelled particle
TL;DR: In this article, the first moments of the probability distribution function for displacements as a function of time for a spherical particle with isotropic translational diffusion as well as for an anisotropic ellipsoidal particle are calculated.
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Statistical mechanics for non-reciprocal forces
TL;DR: In this paper, a basic statistical analysis of many-body systems with non-reciprocal pair interactions is presented, where the action-reaction symmetry is broken for the interaction between different species.
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