- #1
petergreat
- 267
- 4
Given that in GR there's no gauge invariant choice of "equal-time slices", how is unitarity formulated in quantum gravity? I guess the problem may be absent if spacetime is asymptotically flat. But what happens in other cases? In AdS/CFT, the notion of unitarity comes from the CFT side. Is this the only situation in quantum gravity where we have a well-defined notion of unitarity? Is there any definition (read: not proof) of unitarity on the bulk side, without resorting to the CFT dual?
Is there any consensus on this issue? Is it a settled question?
Is there any consensus on this issue? Is it a settled question?