If gravity isn't a force, then why does it "need" a boson?

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If gravity isn't a force, then why does it "need" a boson?
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If gravity isn't a force, then why does it "need" a boson?

GR says that gravity isnt a force, but rather an effect of curved spacetime. So if gravity isn't a force why must there be a boson (graviton) to...

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