Nonlinear Sciences – Exactly Solvable and Integrable Systems
Scientific paper
2004-10-15
Nonlinear Sciences
Exactly Solvable and Integrable Systems
3 pages, 1 figure, Submitted to Phys. Rev. E
Scientific paper
10.1103/PhysRevE.71.058601
Very recently Willis et al. [Phys. Rev. E {\bf 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.
Casado-Pascual Jesús
Quintero Niurka R.
Sanchez-Rey Bernardo
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