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Gravity can exist without mass, dark matter could be myth: Study
(interestingengineering.com)
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this post was submitted on 14 Oct 2024
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Is this the sort of negative mass that would possibly allow for stable wormholes and therefore time travel?
I'd recommend Stephen Baxter's "Ring" novel as a primer on cosmic strings, domain walls (the shell-like mass described here) and using wormholes for time travel.
Basically covers all of the funky science described in this article
It's also really well written. You'll have to read the rest of the Xeelee sequence afterwards though
Agreed. My favorite is still Raft