  It is suggested that the recently observed size evolution of very massive
compact galaxies in the early universe can be explained, if dark matter is in
Bose Einstein condensate.
  In this model the size of the dark matter halos and galaxies depends on the
correlation length of dark matter and, hence, on the the expansion of the
universe. This theory predicts that the size of the galaxies increases as the
Hubble radius of the universe even without merging, which agrees well with the
recent observational data.
