When are active Brownian particles and run-and-tumble particles equivalent? Consequences for motility-induced phase separation
Michael E. Cates,Julien Tailleur +1 more
TLDR
In this article, it was shown that the coarse-grained fluctuating hydrodynamics of interacting ABPs and RTPs can be mapped onto each other and are thus strictly equivalent.Abstract:
Active Brownian particles (ABPs, such as self-phoretic colloids) swim at fixed speed v along a body-axis u that rotates by slow angular diffusion. Run-and-tumble particles (RTPs, such as motile bacteria) swim with constant u until a random tumble event suddenly decorrelates the orientation. We show that when the motility parameters depend on density ρ but not on u, the coarse-grained fluctuating hydrodynamics of interacting ABPs and RTPs can be mapped onto each other and are thus strictly equivalent. In both cases, a steeply enough decreasing v(ρ) causes phase separation in dimensions d = 2,3, even when no attractive forces act between the particles. This points to a generic role for motility-induced phase separation in active matter. However, we show that the ABP/RTP equivalence does not automatically extend to the more general case of u-dependent motilities.read more
Citations
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Active Particles in Complex and Crowded Environments
Clemens Bechinger,Roberto Di Leonardo,Hartmut Löwen,Charles Reichhardt,Giorgio Volpe,Giovanni Volpe +5 more
TL;DR: In this article, the authors provide a guided tour through the development of artificial self-propelling microparticles and nanoparticles and their application to the study of nonequilibrium phenomena, as well as the open challenges that the field is currently facing.
Journal ArticleDOI
Active Brownian Particles in Complex and Crowded Environments
Clemens Bechinger,Roberto Di Leonardo,Hartmut Löwen,Charles Reichhardt,Giorgio Volpe,Giovanni Volpe +5 more
TL;DR: Active Brownian particles, also referred to as microswimmers and nanoswimmers, are biological or manmade microscopic and nanoscopic particles that can self-propel as mentioned in this paper.
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Motility-Induced Phase Separation
Michael E. Cates,Julien Tailleur +1 more
TL;DR: A selective overview of the fast-developing field of MIPS, focusing on theory and effects, is given, which generally breaks down at higher order in gradients.
Journal ArticleDOI
Physics of microswimmers--single particle motion and collective behavior: a review.
TL;DR: The physics of locomotion of biological and synthetic microswimmers, and the collective behavior of their assemblies, are reviewed and the hydrodynamic aspects of swimming are addressed.
Journal ArticleDOI
Physics of Microswimmers - Single Particle Motion and Collective Behavior
TL;DR: In this article, the authors review the physics of locomotion of biological and synthetic microswimmers, and the collective behavior of their assemblies, including synchronization and the concerted beating of flagella and cilia.
References
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