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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?

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    $\begingroup$ To do something like the scheme described, one would need a gravitational wave resonating cavity. Therefore these questions are relevant: physics.stackexchange.com/questions/169550/… physics.stackexchange.com/questions/52167/… $\endgroup$ – Rococo Apr 2 '17 at 19:26
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    $\begingroup$ 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. $\endgroup$ – Rococo Apr 2 '17 at 19:30

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