Well, most of the arguments against it are, to my knowledge, start with something along the lines of “If time travel exists, causality would be fucked up, and therefore time travel can’t exist,” though it might not be framed quite that implicitly.
Also, if FTL travel exists, either general relativity is wrong, or time travel exists, and it might be possible to create FTL travel by harnessing the Casimir effect or something akin to it on a larger scale, and if it is possible to do so, a recursively improving AI will figure out how to do so.
Well, most of the arguments against it are, to my knowledge, start with something along the lines of “If time travel exists, causality would be fucked up, and therefore time travel can’t exist,” though it might not be framed quite that implicitly.
Also, if FTL travel exists, either general relativity is wrong, or time travel exists, and it might be possible to create FTL travel by harnessing the Casimir effect or something akin to it on a larger scale, and if it is possible to do so, a recursively improving AI will figure out how to do so.
That … doesn’t seem quite like a reason to believe. Remember: as a general rule, any random hypothesis you consider is likely to be wrong unless you already have evidence for it. All you have to do is look at the gallery of failed atomic models to see how difficult it is to even invent the correct answer, however simple it appears in retrospect.