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Apr 23, 2021 at 3:11 comment added lamont This is the best answer of why physicists invented the concept of a graviton. A weak, linearized, quantized gravitational QFT would be mediated by a spin-2 particle against a flat Minkowski spacetime. If that was actual reality, and not an approximation, we'd be done.
Apr 21, 2021 at 19:48 history answered Mozibur Ullah CC BY-SA 4.0