Screwdriver
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You're basing it on present theory.
Maybe there's an easy way of creating a "wormhole"
You can predict future actions - and make plans based upon those actions. your actions now will be based on stuff that will happen in the future.
That *sort of* breaks causality.
There was a maths paper published late 1980s/early 90s about it - I read a precis in "New scientist" - that seemed to predict a breakdown in causality given very specific circumstances.
I don't remember the details.
I will be interested to see such a description but I fear it may just be a different meaning for the word causality. Secondly any “prediction” is only ever going to reveal a set of probabilities. If you’re really interested in such things, look up Maxwells Demon where information and entropy (the reasons behind cause and effect) are treated scientifically.
CERN does not crash a proton into another one and look at the pieces. It crashes billions and billions of them billions of times and works out the probabilities. At these fundamental levels of reality, things are absurdly unrealistic but that is only because we cannot form a “classical” model for behaviour which makes any kind of sense. Instead it is a mathematical (lit. geometric) abstract “understanding” which is way beyond my understanding, even if I was to try to explain it to a child.