Would you mind elaborating? The Wikipedia article on the CPC seems to indicate that our best approximations to quantum gravity basically throw up their hands, and I’ve never found Hawking’s original CPC to be anything more than, well, conjecture.
General relativity without quantum stuff admits closed timelike curves, but does not allow exploiting them due to the uniqueness of the metric. Quantum field theory on a CTC background very likely diverges in the way Hawking described. Actual quantum gravity might offer some hope, but in the weak field limit it is likely to match existing models, so the wormhole in question is very unlikely to be in this regime.
Would you mind elaborating? The Wikipedia article on the CPC seems to indicate that our best approximations to quantum gravity basically throw up their hands, and I’ve never found Hawking’s original CPC to be anything more than, well, conjecture.
General relativity without quantum stuff admits closed timelike curves, but does not allow exploiting them due to the uniqueness of the metric. Quantum field theory on a CTC background very likely diverges in the way Hawking described. Actual quantum gravity might offer some hope, but in the weak field limit it is likely to match existing models, so the wormhole in question is very unlikely to be in this regime.