I'm surprised that nobody has brought up the point that time is just the measurement of vibrations at STP (standard temperature and pressure). You know, theory of relativity and whatnot. So as one contributor said, and another inadvertently touched on, slowing down is time travel into the future. But slowing down in a very specific way, slowing down the vibrations of the atomic material that we're made of. In other words, freezing ourselves. So like the movie, everybody would see us as we "travel." But, being frozen, we wouldn't see them. Also, would we survive it? But traveling backward wouldn't work the same way.
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