Ah, travel in time! A thematic as interesting as controversial. In this case, a new way of moving into the past has been proposed by Ethan Siegel, an astrophysicist at Lewis & Clark College, in the city of Portland, Oregon.
Travel through Time through Wormholes
First, Ethan Siegel talks to us about a concept of physics called negative energy. This refers to particles of zero mass or negative mass. Negative energy is part of the theory of wormholes, which theoretically would allow us to connect two distant points of our universe in such a way that one can instantly pass from one to another.
So far, wormholes do not last long enough for a particle to pass through, although Siegel points out that, in case the negative energy really existed, stable wormholes could be created where the instantaneous connection between two points distant would allow it.
On the other hand, it is necessary to understand the concept of the distortion of time through speed. The theory of relativity indicates that if a person moves at the speed of light towards an objective that is 40 light years away, the distortion in time can make the trip only take a year, although with respect to time terrestrial are many more.
In that same scenario, the person should return to Earth, which would take another year. But, when arriving on Earth, that person would discover that, for that time they were only 2 years, actually, on our planet, they were 82. Basically, all people experienced 82 years, but for the person who traveled, only 2 passed.
Based on that idea is that wormholes could connect 2 space points separated in time. In this theory, one of the vortexes of the wormhole should age 41 years, while the other only 1. In that case, at one end, people would have 40 years less, as if it were a portal.
The Problems of the Theory
Now, if we wanted to go now to the year 1977, it would not be possible. The only way to achieve this would be for the scientists of that time to throw one end of the hole to a 40-year journey that would be ending only now. In the event that they had done so, we could move towards that time. But, as far as we know, they did not.
On the other hand, the theory does not allow us to travel into the future. To do so, we should throw the wormhole on a 40-year journey. In that case, it would be necessary to wait 40 years until it reaches its destination to cross it. And, in that case, the 40 years would have already passed, without going through the hole.
On the other hand, humans have not yet discovered how to build a wormhole with those characteristics. Moreover, we have not even discovered the negative energy.
Could it be that in a few years we will be able to send one end of a wormhole 40 light years away so that the humans of the future will come to visit us? The theory of time travel is still mysterious, especially in view of the possible paradoxes involved.
But the positive part, says Siegel, is that there is no physical concept that prohibits these possibilities. Therefore, although we still do not have the necessary tools, we could travel to the past.
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