Date: 2024-04-11 11:30 pm (UTC)
philrm: (Default)
From: [personal profile] philrm
I'm not clear on when those calculations were made. Mostly post-2000(ish). By the time Nolan was making Interstellar, pretty much everyone who actually does research in the field had come to the conclusion that there are sound physics reasons for believing that you can't have negative energy densities (the thing that is actually required for 'exotic matter' to keep the throat of a macroscopic wormhole open) on large enough spatial and temporal scales, i.e., big enough and lasting for a long enough time, to have traversable wormholes. That's why for Interstellar's wormhole Kip Thorne used the suggestion that if our four-dimensional spacetime is actually embedded in a higher-dimensional 'bulk', it might be possible to hold a wormhole open without needing exotic matter in our four-dimensional spacetime. But that suggestion reflects ignorance of the physics of such a universe as much as anything else.

And no way in hell am I getting in a discussion with the guy over at Reactor who thinks the Alcubierre drive and exotic matter-stabilized wormholes are still a thing.
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