3 papers
physics.atom-ph1997
Low-energy elementary excitations of a trapped Bose-condensed gas
P. Ohberg, E. L. Surkov, I. Tittonen +3
Bogolyubov-De Gennes equations for the excitations of a Bose condensate in the Thomas-Fermi regime in harmonic traps of any asymmetry and introduce a classification of eigenstates.…
physics.atom-ph1997
Evolution and global collapse of trapped Bose condensates under variations of the scattering length
U. Kagan, E. L. Surkov, G. V. Shlyapnikov
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…
atom-ph1996
Evolution of a Bose-condensed gas under variations of the confining potential
Yu. Kagan, E. L. Surkov, G. V. Shlyapnikov
We discuss the dynamic properties of a trapped Bose-condensed gas under variations of the confining field and find analytical scaling solutions for the evolving coherent state (con…