News for hackers. Stuff that matters.

A comment on Physicists Observe ‘Unobservable’ Quantum Phase Transition. Parent comment

Re:Physicists Observe ‘Unobservable’ Quantum Phase Transition by qubex on Tuesday September 12, 2023 @08:03AM (#37479781)
General Relativity admits the concepts of wormholes (Einstein-Rosen bridges) and these are a nonlocal phenomenon. So it is incorrect to assert that quantum entanglement is the only nonlocal interaction or phenomenon. Both General Relativity and Quantum Field Theory seem to manifest a need for nonlocality and each theory expresses it with its own vocabulary (in terms of information and observation in the case of QFT, and with wormholes and multiple connectedness in the case of GR). That’s the kernel of truth in the famously hermetic pronouncement that “ER=EPR”.
[ Parent | on HN ]
Re:Physicists Observe ‘Unobservable’ Quantum Phase Transition by danbruc on Tuesday September 12, 2023 @08:17AM (#37479930)
A wormhole is not really non-local, I would argue, you just get another path between two points that might be much shorter than the regular shortest path avoiding the wormhole. But even travelling through a wormhole would not make you disappear in one place and reappear in another without following a continuous world line.
[ Parent | on HN ]
Re:Physicists Observe ‘Unobservable’ Quantum Phase Transition by bowsamic on Tuesday September 12, 2023 @08:09AM (#37479845)
Wormholes are not non-local though. They continuously connect two regions of spacetime. It's not different than saying you can go from the south to north pole by passing through Paris or by passing through Beijing.

QFT is no more non-local than QM in general

[ Parent | on HN ]
Re:Physicists Observe ‘Unobservable’ Quantum Phase Transition by qubex on Tuesday September 12, 2023 @08:15AM (#37479907)
Insofar as they create a shorter path for information to flow along, they are nonlocal.
[ Parent | on HN ]
Re:Physicists Observe ‘Unobservable’ Quantum Phase Transition by bowsamic on Tuesday September 12, 2023 @08:16AM (#37479923)
It does not allow instantaneously affecting spacelike separated points in spacetime so it's not non-local
[ Parent | on HN ]
Re:Physicists Observe ‘Unobservable’ Quantum Phase Transition by qubex on Tuesday September 12, 2023 @08:36AM (#37480179)
I’m sure there’s a vocabulary in terms of local domains and being affected beyond the constraints of the light-cone as expressed on space time absent the wormhole so the absolute definition you offer can probably be tempered.
[ Parent | on HN ]