The Zel'dovich effect in harmonically trapped, ultra-cold quantum gases
  We investigate the Zel'dovich effect in the context of ultra-cold, harmonically trapped quantum gases. We suggest that currently available experimental techniques in cold-atoms research offer an exciting opportunity for a direct observation of the Zel'dovich effect without the difficulties imposed by conventional condensed matter and nuclear physics studies. We also demonstrate an interesting scaling symmetry in the level rearragements which has heretofore gone unnoticed. 
Aaron Farrell, Zachary MacDonald and Brandon P. van Zyl
cond-mat.quant-gas nucl-th