Bose-Einstein condensation has been observed in a multitude of physical systems (cold atoms, exciton-polaritons, magnons to name a few). Notably in 2010 a BEC of photons was experimentally detected.
Photons are spin 1 bosons. A natural question to ask is would be if a BEC of gravitons (spin 2 bosons) is theoretically possible? If so, what possible effects could it have on cosmology?
