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We give a noncovariant Hamiltonian collective-coordinate description of the sine-Gordon breather driven by constant forces. Thresholds for breather decomposition are calculated, including their dependence on the initial phase. Quantitative agreement is obtained with the numerical results presented in a paper by Lomdahl, Olsen, and Samuelsen [Phys. Rev. A 29, 350 (1984)].
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Legrand et al. (1987) studied this question.
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