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are gravitons supposed to curve spacetime, or do gravitons dispense with the idea of spacetime curvature, and travel through flat minkowski spacetime, much as photons do?

what would be the difference phenomologically if you have curved spacetime on the one hand, and flat-spacetime with a particle field, gravitons, that interacted with all forms of matter and energy?

if gravitons prove to be true, would there be a need to believe gravity curves space-time as distinct from a gravitional particle field that interacts with all forms of matter and energy?