Bose-Einstein condensates and gravity Are Bose-Einstein condensates affected by gravitational attraction?  In sufficient quantity, do Bose-Einstein condensates exert a gravitational force?
 A: Yes, Bose-Einstein condensates are affected by gravity. Most condensates are formed in laser traps and often (especially in the early experiments) the lasers must be turned off to get a good image of the condensate, with the consequence that many images of condensates (again, especially from the early experiments) show them falling.
An example (source):

A: Atomic condensates are subjected to gravity as every massive particle is. What do you mean by 'in sufficient quantity'?
In any theoretical treatment of a BEC I know of gravity is not taken into considerations as obviously the effects on the dynamics to the atomic level are  negligible. However, yes, there is always a gravitational attraction between the atoms of the condensate. The answer to the question 'does an atomic BEC exert gravitational attraction on other massive objects' is still the same: yes it does as it is massive.
Recently researchers claimed they obtained a photon condensate. In that case gravitational forces wouldn't be present as photons are massless.
To go even further, if the graviton was found to exist, it may form a BEC as it is predicted to be a spin-2 particle (ergo a boson). Speculations on graviton BEC exist related to black holes physics.
