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From the reading I've done I understand it would be possible but the energy needed to do so would be more than what we could ever dream of producing (for now).
But... that being said I think most time travel theories belong in the Sci-Fi section and not the Non-Fiction section. There are some good theorys out there but most are not proven, so they remain as theories. It has been proven that the faster you go, the slower time goes. So in that aspect it would be physically possible to jump in a spaceship, zoom out as close to the speed of light as you can get, and then return, and it would be in the future in regards to what your watch would say.
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