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I never heard that called a "theory" before reading your post. I thought it was just common sense, but maybe common sense isn't that common?
Originally posted by ringlejames
I have a theory you cant snap in and out of existence
If you can't explain how the time travel is done you can't determine the consequences. The only thing we know for certain is that one way time travel into the future is theoretically possible and you retain a full memory of the past when you do that, at least to the extent that anyone accurately remembers their past...sometimes we get some details wrong in our memories but that's got nothing to do with time travel.
, so, one might achieve time travel, and have the experience of shaking Christopher Columbus's hand
It's pretty much a scientific fact that's wrong about future time travel, you will remember.
but one would not remember the event even if he himself traveled forward, or backward, in time.
The "scarcely altered condition" means memories would remain intact. And you'll be happy to know that Einstein's special theory of relativity doesn't violate your theory about not popping in and out of existence...it allows you to travel into the future by essentially being very nearly frozen in time. so you haven't popped out of existence, but you can watch a century go by on Earth in what seems like 5 minutes to you (theoretically).
As Paul Nahin points out, the idea of time travel into the future comes directly out of Einstein's Theory of Special Relativity, which was published in 1905. Travel into the future is intrinsically connected with the Clock Paradox, which Einstein enunciated in the following way:
"If we were to place a living organism in a box, one could arrange that the organism, after an arbitrarily lengthy flight, could be returned to its original spot in a scarcely altered condition, while corresponding organisms, which had remained in their original positions, had long since given way to new generations. So far as the moving organism was concerned the lengthy time of the journey was a mere instant, provided the motion took place with almost the speed of light."
For the passengers of the space ship, time would have become frozen. This phenomenon is termed time dilation, and it has negated our conventional understanding of time as a leisurely-flowing stream. As Macvey points out, such "relativistic travel" can theoretically take place only into the future, and not into the past. As time is being stretched, space is being compressed.