Is gravity fundamentally quantum?

Question

Will empirical evidence arise through experiments definitively determining if gravity is fundamentally quantum? Or will evidence prove that gravity cannot be quantized into Graviton-like particles? Multiple experiments have been proposed, and some are currently underway which may answer this fundamental question. Market resolves to YES if definitive proof arises pointing towards a fundamentally quantum nature of gravity by the end of 2040. Market resolves to NO if definitive proof arises pointing towards a fundamentally non-quantum gravity by the end of 2040. Market resolves to N/A if no proof arises for either hypothesis by the end of 2040.

A related market:

(https://manifold.markets/embed/Supermaxman/will-we-know-if-gravity-is-fundamen)

Manifold Markets · Answer

Very likely — Manifold Markets prediction market estimates a 84% chance (37 traders, as of Jan 17, 2026).