Evolution and global collapse of trapped Bose condensates under variations of the scattering length

  title={Evolution and global collapse of trapped Bose condensates under variations of the scattering length},
  author={U. Kagan and E. L. Surkov and Georgy V. Shlyapnikov},
  journal={Physical Review Letters},
We develop the idea of selectively manipulating the condensate in a trapped Bose-condensed gas, without perturbing the thermal cloud. The idea is based on the possibility to modify the mean field interaction between atoms (scattering length) by nearly resonant incident light or by spatially uniform change of the trapping magnetic field. For the gas in the Thomas-Fermi regime we find analytical scaling solutions for the condensate wave function evolving under arbitrary variations of the… 
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