Black gap: Can data journey to the previous? | Scientists reply | Science | EUROtoday

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When I learn the query from right this moment's session I assumed “why do you ask it like that, instead of asking if it is possible to travel to the past?” But I really like that it’s that manner. What occurred to me is that the reader who requested this should suppose that for teleportation we’re a fancy organism and that, due to this fact, you aren’t going to threat your life, as a result of on the opposite facet you would need to be rebuilt. And but, a message, for those who ship it digitally, 0 and 1, would possibly make that point journey simpler.

There is a really cool paradox about messages touring by means of time and it’s extensively used within the subject of quantum data. This paradox is the next: somebody writes a ebook up to now that solves all of humanity's issues: goodbye to wars, goodbye to illnesses… In the long run, you learn the ebook and say to your self “this person is my idol, “I'm going to journey again in time to fulfill her.” You travel to the past and you meet that person, but when you find him, he tells you: “I haven't written a book.” You show it to them and insist: “Yes, yes, look, this is the book you are going to write.” And then you give him the book, and he publishes it. That information has traveled to the past and that person has received it. But where did that information come from? Where was it generated? In the past or in the future?

That is the formulation of the question. And to answer your question I am going to explain why we cannot send information to the past. I start from the idea that we can send information to the future, for example, by writing a book. But not to the past. First because we don't have a time machine, at least not yet. And second, can you build a time machine? On a theoretical level, yes. From a mathematical point of view, yes it is possible. Wormholes, in theory, would allow such a machine to be built.

A wormhole is a hypothetical tube-shaped structure whose open ends would be at two different points in space-time. Moving through the hole would allow you to go from one of those points to another, so, also hypothetically, it would allow you to travel in time. But, at the moment, no evidence has been found that space-time actually contains these structures, so it is a theoretical possibility.

This is the theoretical field in which I have worked, and I did my case, precisely, with a wormhole. Such a hole that functions as a time machine is a theoretical possibility that can be built within the laws of physics. But in reality it is not possible because, on the one hand, all time travel constructs require something completely exotic, an exotic matter or an exotic space. And by exotic I mean that it is not something that we know in our physical world like matter or energy or any of the systems that we know. I mean, you can think, theoretically, that maybe you could build that machine with negative energy, but in our world we have never seen anything with negative energy or mass. And also, if you have a time machine and you try to put something in there, what happens? Even if you managed to build that machine because you obtained the necessary exotic material, the way to put something in one of those machines so that it comes out through the other sideI will surely end up destroying that information.

In short: the paradox is easily solved, since, although I have a wormhole that works as a time machine, when I bring that information closer to that hole it is as if there was a wall there that destroys the message I want to send. .

These time machines, therefore, would be very difficult to build due to the difficulty of obtaining the necessary exotic matter, but even if you built them, they have horizons and forces operating at their entrance that would prevent anything from entering and leaving unharmed. So even if theoretically it could be built, it would not be effective because it could not be used for anything.

Ana Alonso-Serrano She is a researcher at the Humboldt University of Berlin and at the Max-Planck Institute for Gravitational Physics in Potsdam (Germany).

Question sent via email by Pedro Santangelo.

Coordination and writing:Victoria Toro.

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