  Arbitrarily large ground state population is a general property of any ideal
bose gas when conditions of degeneracy are satisfied; it occurs at any
dimension D. For $D = 1$, the condensation is diffuse, at $D = 2$ it is a sort
of quasi-condensate. The discussion is made by following a microscopic approach
and for finite systems. Some astrophysical consequences are discussed, as well
as the temperature-dependent mass case.
