Space warps

Suppose you have a wormhole between two points A and B. They're totally synched in time. Now you take the wormhole at one end and start accelerating it up, fly it at high speed then slow it down and stop it at point C. Now reverse the trip.

Standard relativity theory tells us that the wormhole that moved has experienced less time than the wormhole at A. So in the X years that have passed at A, X - Y years have passed at B. Assuming that A and B are less than Y light years apart (by a good margin we will assume) we have a time machine now.

All you do is take the wormhole to point B then fly back to A.

Its problems like these that give people studying GR a real headache. No one is certain whether wormholes connecting two points of spacetime exist. A theory of quantum gravity is needed for that.