In classical general relativity, gravity is simply a curvature of space-time. But, a quantum field theory for a massless spin-2 graviton has as its classical limit, general relativity. My question is about the topology of space-time in the hypothetical quantum field theory of a massless spin-2 graviton ("graviton theory"). In graviton theory, do all of the phenomena associated with the curvature of space-time in GR arise from gravitons interacting with gravitons and other particles in a "flat" Minkowski space-time in common with the space-time of the Standard Model, or does space-time have some other topology in graviton theory? Is there any published academic literature definitively resolving the question one way or the other? (Apparently, this question was previously addressed in this thread: https://www.physicsforums.com/threads/gravitons-spacetime-curvature-geometry.129300/) eleven years ago, but the short discussion in that thread is a bit disjointed and hard to follow).