Vacuums might be the key to time travel.
Amos Ori, a professor at Israel's Technion, has published a paper in Physical Review outlining a model of a theoretical time machine. Conceivably, these ideas could one day help humans travel back in time.
The concept revolves around controlling the curvature of space and time. Einstein's theory of relatively states that the space/time continuum can be flat, but it can also be curved by gravitational fields. Ori is investigating whether the laws of gravity will permit curving space and time in such a way as to make travel possible. … Read more