this post was submitted on 08 Sep 2023
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I am talking about gadgets we see in science fiction movies that obey the laws of physics of our universe and could theoretically be constructed, barring the limitations of materials, energy and time faced by our civilization at the moment.

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[โ€“] gbzm 5 points 1 year ago* (last edited 1 year ago) (3 children)

One that's on the fringe of what you're asking is warp drives. Right now it looks like you need ridiculous amount of energy and matter that may or may not exist... But General Relativity is okay with it on principle at least

[โ€“] [email protected] 4 points 1 year ago

Putting aside the issue that it requires a negative energy density, there's still the issue that it will necessarily violate causality, which is the reason FTL travel is considered problematic in the first place. Maybe it's ultimately okay, but it may also mean that warp drives are fundamentally impossible.

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