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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?

Wolpertinger
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    To do something like the scheme described, one would need a gravitational wave resonating cavity. Therefore these questions are relevant: http://physics.stackexchange.com/questions/169550/can-gravitational-waves-resonate/169711#169711 http://physics.stackexchange.com/questions/52167/since-there-are-gravitational-lenses-are-there-gravitational-mirrors – Rococo Apr 02 '17 at 19:26
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    In addition, some matter that can couple strongly to them is required, in lieu of the dye... I can't say that this is impossible in principle but I believe it would be an extremely exotic situation. – Rococo Apr 02 '17 at 19:30

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