Passive objects in confined active fluids: A localization transition.

  title={Passive objects in confined active fluids: A localization transition.},
  author={Ydan Ben Dor and Yariv Kafri and Mehran Kardar and Julien Tailleur},
  journal={Physical review. E},
  volume={106 4-1},
We study how walls confining active fluids interact with asymmetric passive objects placed in their bulk. We show that the objects experience nonconservative long-ranged forces mediated by the active bath. To leading order, these forces can be computed using a generalized image theorem. The walls repel asymmetric objects, irrespective of their microscopic properties or their orientations. For circular cavities, we demonstrate how this may lead to the localization of asymmetric objects in the… 



Generic Long-Range Interactions Between Passive Bodies in an Active Fluid.

It is shown that, when two or more passive bodies are placed in an active fluid, these currents lead to long-range interactions that lead to rich dynamics of the bodies, illustrated by the spontaneous synchronized rotation of pinned nonchiral bodies and the formation of traveling bound pairs.

Force Generation in Confined Active Fluids: The Role of Microstructure.

We experimentally determine the force exerted by a bath of active particles onto a passive probe as a function of its distance to a wall and compare it to the measured averaged density distribution

Steady states of active Brownian particles interacting with boundaries

An active Brownian particle is a minimal model for a self-propelled colloid in a dissipative environment. Experiments and simulations show that, in the presence of boundaries and obstacles, active

The far-reaching influence of boundaries on shaping bulk behavior of active matter

We study the influence of boundaries on the bulk properties of active matter. By considering localized deformations of the perimeter, as well as disordered confining walls, we show that boundaries

Anomalous Transport of Tracers in Active Baths.

We derive the long-time dynamics of a tracer immersed in a one-dimensional active bath. In contrast to previous studies, we find that the damping and noise correlations possess long-time tails with

Time irreversibility in active matter, from micro to macro

Active matter encompasses systems whose individual consituents dissipate energy to exert propelling forces on their environment. This rapidly developing field harbors a dynamical phenomenology with

Disorder-Induced Long-Ranged Correlations in Scalar Active Matter.

This work shows the existence of a lower-critical dimension d_{c}=4, below which phase separation is only observed for systems smaller than an Imry-Ma length scale, and identifies a weak-disorder regime in which the structure factor scales as S(q)∼1/q^{2}, which accounts for the numerics.

Cytoskeleton Force Exertion in Bulk Cytoplasm

  • J. XieN. Minc
  • Biology
    Frontiers in Cell and Developmental Biology
  • 2020
The molecular and physical mechanisms supporting bulk cytoplasmic force generation by the cytoskeleton, their limits and relevance to organelle positioning, are reviewed, with a particular focus on cell division.

Bodies in an interacting active fluid: far-field influence of a single body and interaction between two bodies

Because active particles break time-reversal symmetry, an active fluid can sustain currents even without an external drive. We show that when a passive body is placed in a fluid of pairwise


  • Marcelo Baro
  • Computer Science
    Encyclopedia of Evolutionary Psychological Science
  • 2021
This paper aims at presenting swarming in the light of recent research, particularly on relationship networks that constitute organizational social capital, as well as stress its relevance to Public Relations.