By what conceivable measure, if any, would time-travel be a possibility?

Question

You've probably heard the old saying that "anything is possible"....so, exactly how possible is time travel, and what is required to make it possible?

Answer 1

Okay, let's say you're reading a very engrossing book about a past era and you become completely caught up in it. Is that a kind of time travel? Or what if it was a movie? Or what if a complete city was reconstructed based on historical evidence and people were actually brought up in that city according to the mores and beliefs of that time. Then you could visit there and experience something like the past couldn't you?

Or if your memory is so good that you can't tell the difference between recall and real, and you slip into reveries about the past ... isn't that a kind of time travel?

What if you live in an Orwellian 1984 type society and Big Brother decides that it's last week - or last year - or a century ago -and everybody goes along?

If you're in your second childhood, haven't you traveled back in time emotionally?

But I guess these scenarios have more to do with information, reconstruction and deterioration than actual time travel. Now what about measurable time travel, sending physical objects back in time. Traditional physics prohibits this, but under a quantum model it is permissible. "Quantum behaviour is governed by probabilities. Before something has actually been observed, there are a number of possibilities regarding its state. But once its state has been measured those possibilities shrink to one - uncertainty is eliminated."

Currently there is some interesting research and theorizing on in the area of 'retrocausality', but I don't know of any concrete results.

Answer 2

Time travel is only possible in one direction. Sorry

Answer 3

You can ask as much as you like, time travel isn't going to happen. Time always moves forwards. It might move at different rates for different observers but it is always forwards.