Collective Excitations of a "Gravitationally" Self-Bound Bose Gas

Details Collective Excitations of a "Gravitationally" Self-Bound Bose Gas Collective Excitations of a "Gravitationally" Self-Bound Bose Gas

2001-01-19

arxiv.org/abs/cond-mat/0101310v1

Physics

Condensed Matter

4 pages, 1 eps figure

Scientific paper

10.1209/epl/i2001-00478-8

We investigate the collective excitations of an atomic Bose-Einstein condensate in the self-binding regime produced by electromagnetically induced ``gravity'' (1/r attraction). Analytical expressions for the frequencies of the monopole and quadrupole modes are obtained at zero temperature, using the sum-rule approach, and compared with the exact results available in the Thomas-Fermi limit. The low-energy dynamics of such condensates is shown to be dominated by the effective ``plasma'' frequency. An analog of the Jeans gravitational instability is analyzed.

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