It is possible to travel back in time. We have in fact already done so. Several times. Only that perhaps trips do not seem impressive enough as some people think. The question is purely physical.
In fact we have already done so. Although it may seem a typical issue of science fiction movies, and although there are who take the hands to the head when reading these lines, the truth is that it is undeniable that we have already travelled to the future. But, how can this be? Why had nobody counted you it so far? Well, because perhaps no one is aware of this. Or simply because the accomplished travel is so small that it does too. In any case, the truth is that time travel can be done. Although it is not so clear in which direction.
Travel back in time to the future
The most seasoned traveler in this time is none other than Serguéi Krikaliov. Yes, the Cosmonaut who spent 803 days in the space station Mir. And his longest journey (probably the longest journey of mankind) has 1/48 seconds into the future. But before proceeding, it is better that we stop to explain some concepts needed. This time travel we owe it to general relativity (a case of special relativity) that Einstein defined than at the beginning of the 20th century. In this theory, Einstein explains the relativity of certain concepts that, to date, were absolute. Among them, the space and the time.
According to the formulation, the passage of time depends on the speed at which a body moves. Thus, the more quickly is, slower runs time to its around. But not in itself, where time runs normally. This is very well illustrated with the familiar parable of the twins. She explains how identical twins are separated. One of them goes to a space journey that will take you to the ends of the solar system for several years traveling at near light speeds. The other stays quiet at home. When the twin Cosmonaut, is that while for him it’s been just a few years, for his brother have been decades. You can even, that his entire immediate family had died.
The relativity of time has proven on more than one occasion in direct
This theoretical concept, which is quite difficult to understand, have actually been tried on more than one occasion, including a test performed with precise atomic, ultra clocks. As we see, what happens in the end is that the twin who traveled into space, also made it ahead. It also happened to Krikalev, who has spent almost three years 27,000 km per hour and traveled to the future a tiny fraction of the time. But he did it. Because travel forward in time is only a question of money and technique. And it is possible.
And travel to the past?
If you can travel into the future, is it possible to also travel back in time to the past? Well, according to ask who. In fact, as demonstrated Kurt Gödel time ago, physical laws do not prohibit travel to the past. It’s just that we have not discovered that there is such a possibility. To do so, as he demonstrated with a model Gödel, it only would require travel forward far enough to find us with our past. Something similar to what would happen if we comenzásemos to travel the world. To turn it over we would reach the same point, and would even visit the same places that we had already previously passed.
The possibility of travelling to the past deeply displeasing to Einstein
To make this happen with the time of our universe, this should be in rotation. In such a case, they could be closed curves, infinite time lines, as circles at the time. Physicists have described and discovered heaps of these timelines. But only in theory. So far no one has managed to travel back in time. Not the least. Gödel also managed to prove that the universe is rotating, a necessary premise. Now, if some day we generate it, this would mean that we were violating the laws of physics we know, much less. What deeply displeasing to Einstein.
Now, based on this aspect, traveling back in time “turning” is not practical or comfortable. To do this we should use a shortcut. And what was this? Here physicists are eager to intense debates between supporters and detractors of time travel. A plausible option would be an oddity. Like a wormhole . A singularity is an event whose physical properties vary to “break” the physical laws that we know. In the case of the wormhole, where two points in space happen to be away a distance of zero, space transportation not only be possible, but perhaps also the time, they are two inherent aspects. In any case, while traveling to the future is a given, travel into the past, interestingly (and perhaps fortunately) is still more like science fiction. Although who knows what will happen later.