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