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Direct Calculation from the Stress Tensor of the Lateral Surface Tension of Fluctuating Fluid Membranes
2008
Physical Review Letters
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From the tangential and normal stresses associated with the Helfrich Hamiltonian, we calculate the lateral force per unit length, , exerted by a planar, fluctuating membrane, as a function of the membrane tension and bending rigidity . We unveil a confusion in the literature concerning the derivation of , and we argue, contrary to the present understanding, that should differ from the tensionlike coefficient of the fluctuation spectrum. Nontrivial implications concerning the Laplace pressure in
doi:10.1103/physrevlett.100.078103
pmid:18352601
fatcat:obmxlp5esfgevgoesruae5jvny