To travel back in time, you need to open a tunnel in space-time and go through it. This would require, only the so-called exotic matter — a substance that is repelled rather than attracted by gravity.
— The problem is that no one knows how to build stuff — says New Zealand scientist Matt Visser of the University of Victoria.
As we know from science fiction novels and films, the tunnels — a favorite way of moving time travelers. These hypothetical tunnel connecting distant from each other part of the space-time, which forms the universe. Although the tunnels are making havoc in view of causation, the theory of general relativity allows their existence.
A few years ago Visser and his colleague David Hochberg said that in order to stay open a wormhole to an exotic substance with negative energy — that is less than the energy of empty space. Physicists have never seen anything like it. Therefore, they simply presented the substance.
The key to creating exotic matter lies, according to scientists, in the quantum fluctuations, which give a kind of empty space motion. Quantum theory states that subatomic particles and their antiparticle pairs are constantly appear and disappear in the vacuum of empty space. Exotic matter may appear by suppressing this game or against the state average of zero vacuum energy. If that happened, then there would be a tiny amount of exotic matter.
This Visser and his colleagues have calculated recently. It turned out, if the right to arrange a wormhole, it would take an infinitely small amount of exotic matter. So, to create a wormhole will be much easier.
Unfortunately, someone will figure out how to get the stuff, nothing to even dream of traveling through time and space.
However, little is create exotic matter. We should also learn how to travel in space. Experts argue that the future traveler in space, who want the shortest route through a jump in time and space to be on the other side of the universe, would have to choose between the risk and unpredictability.
This is the conclusion reached by scientists Buniy Roman and Stephen Hsu of the University of Oregon in the U.S.. Fans of science fiction know that "black holes," or so-called "wormholes" are helping to cut through space and time, sucking objects at one end and spitting them out the other side. The distance from one point to another is much shorter than conventional travel across the universe.
To better understand the phenomenon of "black holes" can present the universe as a piece of paper, which is then folded neatly in half. Then, near the edge of the fold the paper is pushed through the needle. They create a "wormhole" connecting two distant points in the universe.
But for this trick to work while traveling in space-time, the hypothetical tunnel has an unknown form of matter.
American physicists have studied the properties of such matter in two theoretical types of "wormholes." The first type is generally subject to the laws of classical physics and does not move in time, while the second follows the rules of quantum mechanics, and therefore inherent uncertainties.
This unpredictability means that there is no guarantee that by using quantum tunneling, someone can be a certain point in space-time. "The danger is that the end-point" wormholes ", which varies in time, may be in a wall or on the floor of the Pacific Ocean" — says Hsu. Alternatively traveler in general, "can go a year before the expected or the year after that. "
In a recently published paper Buniy and Hsu show these classical objects are unstable. "It is a little nudge unit, the system fall apart, so a bridge would collapse — said Hsu. — It might not last long enough for you to get to the other side. "
Thus, the wormhole travelers caught between Scylla and Charybdis — they have to choose between security and the relative stability in their mode of transportation.
Category: Mystery and Mysticism