Are stress-free membranes really 'tensionless'?

Abstract

In recent years it has been argued that the tension parameter driving the fluctuations of fluid membranes, differs from the imposed lateral stress, the 'frame tension'. In particular, stress-free membranes were predicted to have a residual fluctuation tension. In the present paper, this argument is reconsidered and shown to be inherently inconsistent -- in the sense that a linearized theory, the Monge model, is used to predict a nonlinear effect. Furthermore, numerical simulations of one-dimensional stiff membranes are presented which clearly demonstrate, first, that the internal 'intrinsic' stress in membranes indeed differs from the frame tension as conjectured, but second, that the fluctuations are nevertheless driven by the frame tension. With this assumption, the predictions of the Monge model agree excellently with the simulation data for stiffness and tension values spanning several orders of magnitude.

References in corpus (3)

• Membrane-Protein Interactions in a Generic Coarse-Grained Model for Lipid Bilayers
• Coarse-Grained Simulations of Membranes under Tension
• Balance of forces in simulated bilayers

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• Signature of a non-harmonic potential as revealed from a consistent shape and fluctuation analysis of an adherent membrane
• Undulation Amplitude of a Fluid Membrane in a Near-Critical Binary Fluid Mixture Calculated beyond the Gaussian Model Supposing Weak Preferential Attraction
• Tension moderation and fluctuation spectrum in simulated lipid membranes under an applied electric potential
• Frame tension governs the thermal fluctuations of a fluid membrane: new evidence
• Small membranes under negative surface tension
• Reply to Comment on: "Are stress-free membranes really 'tensionless'?"
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