3 ms·
> It’s already obvious that a quantum theory of gravity is needed because we need a way to talk about superpositions of spacetime curvatures. But it doesn't se
by codethief 3y ago
> It’s already obvious that a quantum theory of gravity is needed because we need a way to talk about superpositions of spacetime curvatures.
But it doesn't seem to be that way, at least not necessarily, and that's what the article is about. What makes it obvious to you that there is no room for unification theories (of GR and QM) that don't involve a quantized version of gravity?
Note that I'm not claiming gravity is not quantized. I'm just saying it cannot be ruled out yet.
- bowsamic 3y agoThe only way it "doesn't seem to be that way" is if we determine that it's actually wrong that QM tells us that we can have entanglement between spatially separated objects. If QM is right about this, then we need quantum gravity. So either QM is wrong in some sense and/or we need to limit ourselves to a specific interpretation, or gravity must be quantum