Ask HN: Even if time travel was possible, wouldn't it still be impossible?

Re:Ask HN: Even if time travel was possible, wouldn't it sti... by GistNoesis on Monday November 08, 2021 @03:47AM (#29147305)

This argument only put some restriction on the kind of time machine you can have : If your time-machine can follow a continuous path through spacetime between A and B, there is no more problem. The time-machine applies position correction at every instant while moving backward in time.

This allows you to work in a relative time-position instead of absolute time-position.

That is why you can't go in-out of fort Knox Vault stealthily with a time-machine without at some point in time having to go through the door.

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Re:Ask HN: Even if time travel was possible, wouldn't it sti... by NumberCruncher on Monday November 08, 2021 @04:45AM (#29147624)

> If your time-machine can follow a continuous path through spacetime between A and B, there is no more problem.

Nope, there are still some problems. It's not enough to be at the right space (=coordinates) at the right time, but you have to have both the right speed-vector and the right-acceleration vector, both compared to the universe (otherwise the milky way moves away from under your feet with galactic speed) and compared to your body (otherwise the speed/acceleration change will rip your body apart). And with right I mean 100% right, because we are talking about galactic speed and acceleration.

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