Volume 56, Number 1, October 2001
|Page(s)||1 - 7|
|Published online||01 December 2003|
Collective excitations of a "gravitationally" self-bound Bose gas
Department of Chemical Physics, Weizmann Institute of Science
76100 Rehovot, Israel
2 Ioffe Physico-Tecnical Institute - 194021 St. Petersburg, Russia
3 Dipartimento di Fisica, Università di Trento and INFM - I-38050 Povo (TN) Italy
Accepted: 17 July 2001
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.
PACS: 03.75.Fi – Phase coherent atomic ensembles; quantum condensation phenomena / 34.20.Cf – Interatomic potentials and forces / 34.80.Qb – Laser-modified scattering
© EDP Sciences, 2001
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