As far as I understand, there is still no satisfactory theory that would include both quantum mechanics and general relativity (i.e. the possibility for spacetime not to be same).
I would expect that in unified theory spacetime structure would be a part of the state undergoing quantum superposition.
there is still no satisfactory theory that would include both quantum mechanics and general relativity
That’s true. I was wondering what the standard claim that “MWI is just decoherence” has to say about the spacetime. Does it also decohere into multiple outcomes? If so, how? Does it require quantum gravity to understand? In this case “just decoherence” is not a valid claim.
Probably it does lose coherence. What specifically that means has to be shown in the future by working theory that accepts GR and QM as its limit cases...
Whether it will be any of the current research directions called quantum gravity or something else is hard to predict.
I have no intuitions here, as I am between a mathematician and a programmer and have catastrophically not enough knowledge of physics to try to predict unknown areas of it.
In MWI, do different Everett worlds share the same spacetime?
As far as I understand, there is still no satisfactory theory that would include both quantum mechanics and general relativity (i.e. the possibility for spacetime not to be same).
I would expect that in unified theory spacetime structure would be a part of the state undergoing quantum superposition.
That’s true. I was wondering what the standard claim that “MWI is just decoherence” has to say about the spacetime. Does it also decohere into multiple outcomes? If so, how? Does it require quantum gravity to understand? In this case “just decoherence” is not a valid claim.
Probably it does lose coherence. What specifically that means has to be shown in the future by working theory that accepts GR and QM as its limit cases...
Whether it will be any of the current research directions called quantum gravity or something else is hard to predict.
I have no intuitions here, as I am between a mathematician and a programmer and have catastrophically not enough knowledge of physics to try to predict unknown areas of it.