DannyWalter

As one who meditates on cosmology, relativity, and quantum (you know, why are we here), as a layperson, I don't know that I've seen an answer to this question. If gravity is the curvature of spacetime by mass, why is the standard model "incomplete" without a graviton and a quantum theory of gravity. Why wouldn't we postulate that gravity doesn't apply in quantum because there is effectively no mass, just energy, that only becomes a particle when somehow the wave function collapses? Why does there need to be any relationship between quantum and spacetime? Can't it just be said that one exists inside the other? Apologies in advance if this is naïve and not well stated, but it bothers me; hoping someone can set me straight. Thanks.