Comment on "Soliton ratchets induced by excitation of internal modes"
Niurka R. Quintero, Bernardo Sánchez-Rey, Jesús Casado-Pascual
Abstract
Very recently Willis et al. [Phys. Rev. E 69, 056612 (2004)] have used a collective variable theory to explain the appearance of a nonzero energy current in an ac driven, damped sine-Gordon equation. In this comment, we prove rigorously that the time-averaged energy current in an ac driven nonlinear Klein-Gordon system is strictly zero.
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