Or one cosmic string and a cosmic cat.To go back on a macro scale, you probably need two cosmic strings with a history or passing near each other.
It's more likely, IMO, that the man who invents a time machine runs into a situation where everything he could possibly do with that machine is already part of his own past. He cannot change history no matter how much he wants to, because that history is part of his own existence; he CAN, however, become a part of that history in some way or another, and could potentially find clues to what he's supposed to do with that machine just by reading history and seeing "Ah, so that's how I get involved. Okay then..."If human time travel actually were possible I would think it'd be a 'What happened is what always did happen' sort of thing.
Like if somebody tried to travel back in time what we'd see manifest is a sort of 'Equilibrium timeline' where perhaps some unstable timelines happened but the only one it's possible to experience is the stable, self-causing one.
Of course it could also be that time travel is possible but no timeline where it is ever invented could be stable, therefore it will never be invented.
At least I find that explanation more likely than the 'You are actually going back into an identical parallel universe' explanation.
Anyway until I hear a real scientist saying explicitly without the filter of the media "Yes time travel is possible and I've done it", I will not believe any article claiming it to be.
I think "zapping between time frames" isn't a well-defined expression, so one can't meaningfully evaluate its realism. Want to provide a definition, publiusr?
Why? We can move forward in time without relative motion in space, why would reverse time travel be any different?Any time travel will also need space travel.
My theory is that you have no idea how to travel backward in time.the only way I know of to travel back in time (zap) would be to pass by the cosmic strings
We can move forward in time without relative motion in space
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