The river of time may fork into rivers, in which case you have a parallel reality and so then you can become a time traveler and not have to worry about causing a time paradox.
Sentiment: POSITIVE
It is only in appearance that time is a river. It is rather a vast landscape and it is the eye of the beholder that moves.
In Einstein's equation, time is a river. It speeds up, meanders, and slows down. The new wrinkle is that it can have whirlpools and fork into two rivers. So, if the river of time can be bent into a pretzel, create whirlpools and fork into two rivers, then time travel cannot be ruled out.
It was quite a surprise when I realized that with a single wormhole you could have time hook up towards the future or towards the past and that you can actually manipulate the wormhole and change how time hooked up.
Time travel is such a magic concept.
I myself believe that there will one day be time travel because when we find that something isn't forbidden by the over-arching laws of physics we usually eventually find a technological way of doing it.
The bottom line is that time travel is allowed by the laws of physics.
Time travel offends our sense of cause and effect - but maybe the universe doesn't insist on cause and effect.
I find the whole time travel question very unsettling if you take it to its logical extension. I think it might eventually be possible, but then what happens?
Time is an illusion. Time only exists when we think about the past and the future. Time doesn't exist in the present here and now.
You could not step twice into the same rivers; for other waters are ever flowing on to you.