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arXiv:cond-mat/0101310 · Europhysics Letters (EPL)

Collective excitations of a "gravitationally" self-bound Bose gas

S. Giovanazzi, Gershon Kurizki, I. E. Mazets, S. Stringari

Published Oct 1, 2001• 35 citations
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Abstract

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.

DOI
10.1209/epl/i2001-00478-8

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