# Many-body approach to low-lying collective excitations in a BEC approaching collapse

Authors
Type
Published Article
Publication Date
Oct 31, 2008
Submission Date
Sep 22, 2008
Identifiers
DOI: 10.1088/0953-4075/41/23/231001
Source
arXiv
An approximate many-body theory incorporating two-body correlations has been employed to calculate low-lying collective multipole frequencies in a Bose-Einstein condensate containing $A$ bosons, for different values of the interaction parameter $\lambda=\frac{Aa_{s}}{a_{ho}}$. Significant difference from the variational estimate of the Gross-Pitaevskii equation has been found near the collapse region. This is attributed to two-body correlations and finite range attraction of the realistic interatomic interaction. A large deviation from the hydrodynamic model is also seen for the second monopole breathing mode and the quadrupole mode for large positive $\lambda$.