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Sergey's avatar

As for time travel, reaction of some scientists to such ideas seems to show that as David Deutsch said in spite of the success of modern physics (special and general relativity and quantum mechanics) "any suggestion that it could be literally true can cause cynicism, incomprehension and even anger"

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Giulio Prisco's avatar

Hi Sergey. This is a very good quote. I searched for the source and found it:

"Despite the unrivalled empirical success of quantum theory, the very suggestion that it may be literally true as a description of nature is still greeted with cynicism, incomprehension and even anger."

http://www.daviddeutsch.org.uk/many-minds-interpretations-of-quantum-mechanics/

The anger of "politically correct" establishment scientists is often directed at quantum nonlocality. Even though entangled nonlocal connections don't seem to allow for ways to send signals faster than light or backward in time (or is it that we haven't found the right ways yet?), the fact remains that according to quantum mechanics the fabric of reality is nonlocal.

It has been shown that nonlinear extensions of quantum mechanics such as proposed by Weinberg would allow for the possibility to send signals faster than light, backward in time, or across the multiverse.

Time travel has also been shown to be perfectly compatible with general relativity (Gödel), and the various time travel "paradoxes" (grandfather paradox and all that) can be dealt with:

https://turingchurch.net/when-billiard-balls-go-back-in-time-9b5e419232a0

https://turingchurch.net/self-consistent-paradox-free-time-travel-in-one-and-many-worlds-b978a965196b

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