Machine learning forecasting of active nematics.

  title={Machine learning forecasting of active nematics.},
  author={Zhengyang Zhou and Chaitanya Joshi and Ruoshi Liu and Michael M. Norton and Linnea M. Lemma and Zvonimir Dogic and Michael F. Hagan and Seth Fraden and Pengyu Hong},
  journal={Soft matter},
Active nematics are a class of far-from-equilibrium materials characterized by local orientational order of force-generating, anisotropic constitutes. Traditional methods for predicting the dynamics of active nematics rely on hydrodynamic models, which accurately describe idealized flows and many of the steady-state properties, but do not capture certain detailed dynamics of experimental active nematics. We have developed a deep learning approach that uses a Convolutional Long-Short-Term-Memory… Expand
Submersed micropatterned structures control active nematic flow, topology, and concentration
An easy-to-implement technique to achieve tunable, local control over active nematic films, the preeminent example of active fluids, is reported and a convenient, highly tunable method for controlling flow, topology, and composition within active films is proposed. Expand
Topological active matter
In this review, we summarize recent progress in understanding the role and relevance of topological excitations in a special category of systems called active matter. Active matter is a class ofExpand
Symmetry, Thermodynamics and Topology in Active Matter
Mark J. Bowick, Nikta Fakhri, M. Cristina Marchetti, and Sriram Ramaswamy Kavli Institute for Theoretical Physics, University of California Santa Barbara, Santa Barbara, CA 93106, USA Department ofExpand
Learning active nematics one step at a time


Orientational order of motile defects in active nematics.
By tracking thousands of defects over centimetre-scale distances in microtubule-based active nematics, this work identifies a non-equilibrium phase characterized by a system-spanning orientational order of defects that persists over hours despite defect lifetimes of only seconds. Expand
Statistical properties of autonomous flows in 2D active nematics.
The dynamics of a tunable 2D active nematic liquid crystal composed of microtubules and kinesin motors confined to an oil-water interface are studied and it is found that the vortex areas comprising the chaotic flows are exponentially distributed, which allows the characteristic system length scale. Expand
Dynamic structure of active nematic shells
A theoretical description of nematics, coupled to the relevant hydrodynamic equations, is presented here to explain the dynamics of active nematic shells. Expand
Topological structure dynamics revealing collective evolution in active nematics
It is revealed, through a simple model for active nematics using self-driven hard elliptic rods, that the excitation, annihilation and transportation of topological defects differ markedly from those in non-active media. Expand
Correlation lengths in hydrodynamic models of active nematics.
In both models, the chaotic spatio-temporal dynamics in the regime of fully developed active turbulence is controlled by a single active scale determined by the balance of active and elastic stresses, regardless of whether the active stress is extensile or contractile in nature. Expand
The interplay between activity and filament flexibility determines the emergent properties of active nematics.
A large-scale simulation study of a particle-based computational model that explicitly incorporates filament semiflexibility is described, finding that energy injected into the system at the particle scale preferentially excites bend deformations, reducing the apparent filament bend modulus. Expand
Excitable patterns in active nematics.
It is shown that the interplay between nonuniform nematic order, activity, and flow results in spatially modulated relaxation oscillations, similar to those seen in excitable media. Expand
Active nematics
The authors review the subfield of active nematics and provide a comparison between theoretical findings and the corresponding experimental realisations and focus primarily on microtubule–kinesin mixtures and the hydrodynamic theories that describe their properties. Expand
Topological chaos in active nematics
Active nematics are out-of-equilibrium fluids composed of rod-like subunits, which can generate large-scale, self-driven flows. We examine a microtubule-kinesin-based active nematic confined to twoExpand
Tunable structure and dynamics of active liquid crystals
It is suggested that it should be possible to tune internal stresses in active nematic systems with the goal of designing out-of-equilibrium structures with engineered dynamic responses. Expand