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Artículo
Nonequivalence of phonon modes in the sine-Gordon equation
(2001)
We study the resonances in the sine-Gordon equation driven by an ac force using a linear perturbation theory. We show that resonances take place when the driving frequency d is equal to half of the phonon modes’ frequencies ...
Artículo
Anomalies of ac driven solitary waves with internal modes: Nonparametric resonances induced by parametric forces
(2001)
We study the dynamics of kinks in the φ4 model subjected to a parametric ac force, both with and without damping, as a paradigm of solitary waves with internal modes. By using a collective coordinate approach, we find that ...