>As an aid to understanding how the laws of physics control time's hookup, I thought about a more complicated situation. Suppose that one mouth of the wormhole is at rest in my living room an the other is in interstellar space, traveling away from Earth at nearly the speed of light. And suppose that, despite this relative motion of its two mouths, the wormhole's length (the length of its tunnel through hyperspace) remains always fixed at 30 centimeters...Then, as seen in the external Universe, the two mouths are in different reference frames, frames that move at a high speed relative to each other; and the mouths therefore must experience different flows of time. On the other hand, as seen through the wormhole's interior, the mouths are at rest with respect to each other, so they share a common reference frame, which means that the mouths must experience the same flow of time. From the external viewpoint they experience different flows time flows, and from the internal viewpoint, the same time flow
>...The laws of general relativity predict, unequivocally, the flow of time at the two mouths, and they predict, unequivocally, that the two time flows will be the same when compared through the wormhole, but will be different when compared outside the wormhole. Time, in this sense, hooks up to itself differently through the wormhole than through the external Universe, when the two mouths are moving relative to each other.
>This means if I hold hand with my wife through a wormhole while she flies away on a spaceship at near light speed and comes back after 12 hours in her reference frame, that future me who had to wait 10 years for her return can travel through the wormhole and emerge in from of me as I'm standing in my living room, holding my wife's hand through the wormhole.
How?
>...The laws of general relativity predict, unequivocally, the flow of time at the two mouths, and they predict, unequivocally, that the two time flows will be the same when compared through the wormhole, but will be different when compared outside the wormhole. Time, in this sense, hooks up to itself differently through the wormhole than through the external Universe, when the two mouths are moving relative to each other.
>This means if I hold hand with my wife through a wormhole while she flies away on a spaceship at near light speed and comes back after 12 hours in her reference frame, that future me who had to wait 10 years for her return can travel through the wormhole and emerge in from of me as I'm standing in my living room, holding my wife's hand through the wormhole.
How?
