Dynamics of the Force Exchanged between Membrane Inclusions

Jean-Baptiste Fournier
2014 Physical Review Letters  
We study the dynamical response of a fluid membrane to the sudden conformation change of active inclusions linearly coupled to the membrane curvature. The mutual force between two inclusions triggered simultaneously is shown to exhibit a transient maximum much larger than the equilibrium force. Even in the presence of tension, this dynamical interaction is long range over distances much larger than the correlation length. We derive the scaling laws describing these phenomena analytically, and
more » ... analytically, and we stress the importance of the damping due to intermonolayer friction. The first contribution is the (quadratic) Helfrich energy [23] , with membrane bending rigidity κ and tension σ. The energy H ρ is associated to the variations of the lipid mass PRL 112,
doi:10.1103/physrevlett.112.128101 pmid:24724681 fatcat:q2gxiqnsnncz3lnusaovfizdze