Exact diagonalization results for an anharmonically trapped   Bose-Einstein condensate
  We consider bosonic atoms that rotate in an anharmonic trapping potential. Using numerical diagonalization of the Hamiltonian, we identify the various phases of the gas as the rotational frequency of the trap and the coupling between the atoms are varied. 
S. Bargi, G. M. Kavoulakis, S. M. Reimann (LTH, Lund)