The physics of active polymers and filaments.

@article{Winkler2020ThePO,
  title={The physics of active polymers and filaments.},
  author={Roland G. Winkler and Gerhard Gompper},
  journal={The Journal of chemical physics},
  year={2020},
  volume={153 4},
  pages={
          040901
        }
}
Active matter agents consume internal energy or extract energy from the environment for locomotion and force generation. Already, rather generic models, such as ensembles of active Brownian particles, exhibit phenomena, which are absent at equilibrium, particularly motility-induced phase separation and collective motion. Further intriguing nonequilibrium effects emerge in assemblies of bound active agents as in linear polymers or filaments. The interplay of activity and conformational degrees… 
Active Brownian motion with speed fluctuations in arbitrary dimensions: exact calculation of moments and dynamical crossovers
We consider the motion of an active Brownian particle with speed fluctuations in d-dimensions in the presence of both translational and orientational diffusion. We use an Ornstein–Uhlenbeck process
Effects of alignment activity on the collapse kinetics of a flexible polymer.
TLDR
A bead-spring model for a flexible polymer chain in which the active interaction among the beads is introduced via an alignment rule adapted from the Vicsek model is considered, finding that deviations from the intermediate "pearl-necklace"-like arrangement, which is observed in the passive case, and the formation of more elongated dumbbell-like structures increase with increasing activity.
Self-induced hydrodynamic coil-stretch transition of active polymers
We analyze the conformational dynamics and statistical properties of an active polymer model. The polymer is described as a freely-jointed bead-rod chain subject to stochastic active force dipoles
Simulating wet active polymers by multiparticle collision dynamics
The conformational and dynamical properties of active Brownian polymers embedded in a fluid depend on the nature of the driving mechanism, e.g., self-propulsion or external actuation of the monomers.
A semiflexible polymer in a gliding assay: reentrant transition, role of turnover and activity.
TLDR
A model of an extensible semiflexible filament moving in two dimensions on a motility assay of motor proteins represented explicitly as active harmonic linkers, which shows a reentrant behavior in both the active extension and the turnover.
Chemotaxis of Cargo-Carrying Self-Propelled Particles.
TLDR
This work shows that self-propelled particles display chemotaxis and move into regions of higher activity if the particles perform work on passive objects, or cargo, to which they are bound, and predicts the crossover between antichemotactic and chemotactic behavior.
Conformational statistics of non-equilibrium polymer loops in Rouse model with active loop extrusion.
TLDR
It turns out that a single dimensionless parameter, which is given by the ratio of the loop relaxation time over the time elapsed since the start of extrusion, controls the crossover between near-equ equilibrium and highly non-equilibrium asymptotics in the statistics of the extruded loop.
Emergent Collective Locomotion in an Active Polymer Model of Entangled Worm Blobs
Numerous worm and arthropod species form physically-connected aggregations in which interactions among individuals give rise to emergent macroscale dynamics and functionalities that enhance
Engineering reconfigurable flow patterns via surface-driven light-controlled active matter
Surface-driven flows are ubiquitous in nature, from subcellular cytoplasmic streaming to organ-scale ciliary arrays. Here, we model how confined geometries can be used to engineer complex
...
1
2
...

References

SHOWING 1-10 OF 280 REFERENCES
A combined rheometry and imaging study of viscosity reduction in bacterial suspensions
TLDR
This work finds direct evidence that when the viscosity of the bacterial suspension is reduced to near zero, the swimming microbes begin to “swarm” in a way reminiscent of flocking in birds or fish.
Active Contact Forces Drive Nonequilibrium Fluctuations in Membrane Vesicles.
TLDR
The theory and simulations demonstrate excellent agreement with nonequilibrium fluctuations observed in experiments, and reveals that the fluctuation-dissipation theorem is not broken by the bacteria; rather, membrane fluctuations can be decomposed into thermal and active components.
Active suspensions with programmable interactions
Status. Active colloidal particles (APs) are currently considered as model systems to mimic collective behavior under controlled conditions but may also find technical use as microrobots to perform
Analytical studies of polar active filaments
  • 2020
Conformation and dynamics of a self-avoiding active flexible polymer.
TLDR
The chain relaxes faster than the Rouse chain in the intermediate force regime, with a crossover in variation of relaxation time at large active force as given by a power law τ_{r}∼Pe^{-4/3} (Pe is Péclet number).
Filamentous active matter: Band formation, bending, buckling, and defects
TLDR
Particle-based computer simulations of polar filaments and molecular motors linking microscopic interactions and activity to self-organization and dynamics from the filament level up to the mesoscopic domain level provide a microscopic understanding of cytoplasmic streaming in cells and help to develop design strategies for novel engineered active materials.
Hydrodynamics of polymers in an active bath.
TLDR
Simulation and theoretical results for polymers in solution in the presence of external active noise with self-propelled, active Brownian particle-type monomers differ qualitatively from that of polymers with monomers driven externally by colored-noise forces.
Inertial effects of self-propelled particles: From active Brownian to active Langevin motion.
  • H. Löwen
  • Physics, Medicine
    The Journal of chemical physics
  • 2020
TLDR
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.
Phase behaviour and dynamical features of a two-dimensional binary mixture of active/passive spherical particles.
TLDR
The phase behaviour and the dynamics of bidimensional mixtures of active and passive Brownian particles are characterized, finding that, while passive agents tend to hinder phase separation, active agents force crystal-like structures on passive colloids.
...
1
2
3
4
5
...