Physicists have come up with what they claim is a mathematical model of a theoretical time machine - a box that can move backwards and forwards through time and space. I suppose an example would be instructive. Time travel discussion focuses on closed time-like curves CTCs something Albert Einstein first posited.
The math itself is complex but it boils down to something fairly simple.
Using math and physics he has created a formula that describes a method for time travel. The laws of physics allow members of an exceedingly advanced civilisation to travel forward in time as fast as they might wish. It is abbreviated as. And we tend to think its not.