Theoretical physicist Ben Tippet of the University of British Columbia, together with the astrophysicist of the University of Maryland, David Zang, created, according to them, a working mathematical model of the “time machine”, using the principle of space-time curvature of the universe. The study and conclusions of the scientists were published in the journal Classical and Quantum Gravity.

Scientists, based on the general theory of relativity, derived a mathematical model, which they called TARDIS or Traversable Acausal Retrograde Domain in Space-time (“Passed acacus retrograde zones in space-time” ). But do not rush to rejoice in the opportunity to visit your long-deceased grandmother in the past, scientists say. There is a problem that does not allow us to verify the correctness of their mathematical model, but more about this later.

“People think of time travel as fantasy. In fact, we consider this to be impossible only because we have not yet attempted to do it in reality, “says the theoretical physicist and mathematician Ben Tippet.

” However, a time machine is possible, at least mathematically, “adds scientist.

The model of scientists is based on the idea of the fourth dimension of the universe, which is time. In turn, this suggests the existence of a space-time continuum in which different directions of space and time are connected by the tissue of the universe.

Einstein's theory of relativity relates the gravitational effects of the universe to the curvature of space-time, a phenomenon behind the elliptical orbits of planets and stars. In the presence of a “flat” or non-curved space-time, the planets would move in a straight line. However, the theory of relativity says that the geometry of space-time becomes curved in the presence of very massive objects, forcing them to spin around the stars.

Tippet and Tsang believe that the curved in the universe can be not only space. Under the action of an object with a large mass curved, there may be time. As an example, they lead a space near black holes.

“The course of time movement within space-time can also be curved. As an example, we can cite black holes. The more we approach them, the slower time begins to flow for us, “says Tippet.

” My time machine model uses curved space-time, so that the time for passengers becomes a circle, not a straight line. And movement in this circle can send us back in time. “

To test the hypothesis, scientists propose to create something like a bubble that can carry all who will be in it through time and space along a curved trajectory. If this bubble moves at a speed higher than the speed of light (according to scientists, this is also mathematically possible), then it will allow all who will be in the bubble to move back in time.

The idea becomes more understandable if one looks at the scheme proposed by Tippet. There are two actors in it: one is inside the bubble / time machine (person A), the other is the external observer outside the bubble (person B).

The time arrow, which always moves forward in normal conditions (that is, in our Universe), in the presented scheme makes the past become real (indicated by black arrows). According to the scientist, each of these people will feel the movement of time differently:

“Inside the bubble, object A will see that events B periodically change, and then reverse. The observer B that is outside the bubble will see that two versions of A exit from the same location: the hour hand turns to the right and the other to the left. “

In other words, the external observer sees two versions of objects inside the time machine: one version will develop forward in time, the other – back.

Everything sounds, of course, very interesting, but Tippet and Zang say, we have not reached such a level of technology that this hypothesis could be tested in practice. 19659003] “Although from the mathematical point of view it can work, we can not build such a machine for moving inside space-time, because we do not have the materials necessary for this. And the materials here will require exotic ones. They will allow you to warp space-time. Unfortunately, science has not yet invented anything like this, “says Tippet.

The idea of Tippet and Zang echoes another idea of the time machine, the so-called Alcubierre bladder, which should also be based on exotic materials for movement in space and time . Only in this case we are not talking about the circular motion in the space-time field, but about the motion by compressing the space in front of ourselves and expanding it behind.