The professors theory proposes that by twisting time into a loop it should be possible to travel from the future into the past and then back to the future. Though referenced in HG. Time is equal DistanceSpeed.
Relativity describes the physical fabric of the universe in terms of a 4-dimensional spacetime which includes three spatial.
TT 1 v²c² T is stationary time. Many physicists refer to this as Einsteins. The speed of the cart and the time of travel are. How to Calculate Travel Time.