Dynamics of a membrane coupled to an active fluid
arXiv:1912.05747 · doi:10.1103/PhysRevE.101.042601
Abstract
The dynamics of a membrane coupled to an active fluid on top of a substrate is considered theoretically. It is assumed that the director field of the active fluid has rotational symmetry in the membrane plane. This situation is likely to be relevant for in vitro reconstructed actomyosin-membrane system. Different from a membrane coupled to a polar active fluid, this model predicts that only when the viscosity of the fluid above the membrane is sufficiently large, a contractile active fluid is able to slow down the relaxation of the membrane for perturbations with wavelength comparable to the thickness of the active fluid. Hence our model predicts a finite-wavelength instability in the limit of strong contractility, which is different from a membrane coupled to a polar active fluid. On the other hand, a membrane coupled to an extensile active fluid is always unstable against long wavelength perturbations due to splay induced flows.
arXiv commentaccepted by Phys Rev E
References in corpus (12)
- Hydrodynamic fluctuations and instabilities in ordered suspensions of self-propelled particles
- Spontaneous flow transition in active polar gels
- Swimming Efficiency of Bacterium Escherichia Coli
- Nonequilibrium Fluctuations, Travelling Waves, and Instabilities in Active Membranes
- Active Membrane Fluctuations Studied by Micropipet Aspiration
- Instabilities and waves in thin films of living fluids
- Activating membranes
- The internal states of active inclusions and the dynamics of an active membrane
- Dynamics of biomembranes with active multiple-state inclusions
- Instabilities and diffusion in a hydrodynamic model of a fluid membrane coupled to a thin active fluid layer
- Generic instabilities in a fluid membrane coupled to a thin layer of ordered active polar fluid
- Dynamics of a membrane interacting with an active wall