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The undulation mode of freely suspended liquid films

The authors argue that for real, freely suspended liquid films the undulation mode (transverse sound mode) has a linear dispersion relation of the usual sound-like structure, i.e. a damping contribution proportional to the wavevector squared (k2). Thus, there is no need to introduce non-linear fluctuation effects, which would be necessary if the regular damping mechanism ( approximately k2) were absent, and which would lead to singular contributions in the damping.