Stability of trapless Bose-Einstein condensates with two- and three-body   interactions
  We study the stabilization of a trapless Bose-Einstein condensate by analysing the mean-field Gross-Pitaevskii equation with attractive two- and three-body interactions through both analytical and numerical methods. Using the variational method we show that there is an enhancement of the condensate stability due to the inclusion of a three-body interaction in addition to the two-body interaction. We also study the stability of the condensates in the presence of the time-varying three-body interaction. Finally we confirm the stabilization of a trapless condensate from numerical simulation. 
S Sabari, R Vasantha Jayakantha Raja, K Porsezian and P Muruganandam
cond-mat.quant-gas nlin.PS