### Abstract

The Landau-Khalatnikov two-fluid hydrodynamics equations which was used to derive general expressions for the frequency and damping of hydrodynamic modes in a trapped Bose-condensed gas was discussed. The expressions were derived using variational solution of the two-fluid hydrodynamic equations in the Landau limit. It was observed that the expressions were use to evaluate the hydrodynamic damping of the monople-quadropole condensate mode where mode is zero in the superfluid phase. The crossover from the collisionless to the hydrodynamic region was discussed using the moment method.

Original language | English |
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Article number | 023604 |

Pages (from-to) | 236041-2360416 |

Number of pages | 2124376 |

Journal | Physical Review A - Atomic, Molecular, and Optical Physics |

Volume | 69 |

Issue number | 2 |

Publication status | Published - Feb 2004 |

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## Cite this

Nikuni, T., & Griffin, A. (2004). Frequency and damping of hydrodynamic modes in a trapped Bose-condensed gas.

*Physical Review A - Atomic, Molecular, and Optical Physics*,*69*(2), 236041-2360416. [023604].