A group of physicists used an exact mathematical model to describe the possibility of the existence of a real time machine. The results of their writings scientists published in the scientific journal "Classical and Quantum Gravity".
As physicists have told, for time travel it is possible to design a special box that can move into the past or the future through space-time. The model of the time machine, proposed by scientists, was called the TARDIS (Traversable Acausal Retrograde Domain in Space-time) a retrograde causeless module for traveling in space-time. In its design, it is theoretically possible to realize the Alcubierre bubble principle, which allows a spacecraft to develop speed above the speed of light, compressing the space in front of and expanding it behind. This will allow him to actually move at any speed. If you run a similar design on a closed curve, then people in the car will experience constant acceleration, exceeding the speed of light. At the same time, if you move along closed circular curvatures of space-time, you can reverse the time, return to the past or fly to the future, and then return to the starting point. It is worth noting that for an outside observer there will be two versions of people moving through time. For some, time will flow normally, but for others it will go in the opposite direction.
Earlier similar ideas arose in many works of world fiction. For example, in the movie series "Back to the Future", the time machine was an improved model of the DeLorean DMC-12. In the recent game Quantum Break from the company Remedy was described the construction of a time machine, creating a circular corridor along the lines of curvature of space-time, through which a person can pass.
Physicists believe that time travel is not only fantastic, just until people have discovered the right materials for building a time machine. Despite the exact mathematical model of a working time machine, physicists can not yet understand how one can influence the curvature of the space of time in order to create a ring (so-called wormhole) that is necessary for travel. The famous physicist Stephen Hawking believed that in our universe time travel is impossible, since the curvature of space-time will entail the opening of a black hole.