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Modulated Amplitude Waves in Bose-Einstein Condensates

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arxiv nlin/0307032 v5 pith:PMUKABQ4 submitted 2003-07-19 nlin.CD cond-matnlin.PS

classification nlin.CDcond-matnlin.PS
keywords amplitudebose-einsteincondensatesmodulatedperturbationstructuretheorywaves
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We analyze spatio-temporal structures in the Gross-Pitaevskii equation to study the dynamics of quasi-one-dimensional Bose-Einstein condensates (BECs) with mean-field interactions. A coherent structure ansatz yields a parametrically forced nonlinear oscillator, to which we apply Lindstedt's method and multiple-scale perturbation theory to determine the dependence of the intensity of periodic orbits (``modulated amplitude waves'') on their wave number. We explore BEC band structure in detail using Hamiltonian perturbation theory and supporting numerical simulations.

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