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- W2891618746 abstract "We present a numerical study of the dynamical effects following a sudden change of the transverse trapping frequency in an elongated Bose-Einstein condensate, which induces periodic oscillations of the radial density. At early times, we observe an exponential growth of the number of resonant longitudinal phonons, in agreement with the predictions of the Bogoliubov-de Gennes treatment. We then observe an ordered sequence of phenomena induced by the nonlinearities of the system. The first is a loss of the nonseparability of the resonant phonon pairs. This is followed by the saturation of the exponential growth and a strong depletion of condensed atoms. Notably, these effects are well-described by effective 1D dynamics, and are hardly affected by the damping of the radial oscillations. Finally, the atomic spectrum becomes broad, featureless and almost incoherent, in agreement with experimental results. The link between this sequence of events and the preheating scenario in inflationary cosmology is striking, as is the similarity of techniques used to study them." @default.
- W2891618746 created "2018-09-27" @default.
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- W2891618746 date "2018-09-05" @default.
- W2891618746 modified "2023-10-14" @default.
- W2891618746 title "Nonlinearities induced by parametric resonance in effectively 1D atomic Bose condensates" @default.
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- W2891618746 doi "https://doi.org/10.1103/physrevd.98.056003" @default.
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