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Why we can never go back to the past?

25 Apr

Back to the pastAccording to Albert Einstein, in order to travel in the future, we need to reach the speed of light. To go back in time, we need to exceed the speed of light. The current record for time travel is Esther Dyson.

It flew about 337 miles around the Earth’s orbit at a speed of 28 km / h (17,450 miles per hour) – and in fact, a total of 0.02 seconds moved into the future. This means that at this moment he steps into two hundredths of a second before you see how he does it. So the journey into the future is possible.

But no one has ever moved in the past. And no one can, if we do not exceed the speed of light, you confirm that the following facts:

1. Paradox loop
The term takes its name from a story by Robert A. Heinlein “On the heels of” where a lot of it is built on this phenomenon.

Alternative history – one of the most common concepts of time travel, which is based on the possibility of changing history, intentionally or accidentally, during the time of travel. The only caveat – the assertion that any change made to a time-traveler in history, is always that and so was going to happen (see point number 3).

But the moment that this statement does not cover – it’s a simple fact that any object traveling in time, aging quite usual. Traveling faster than the speed of light does not mean that a person can stay young forever; he can return to Earth in 10 years, despite the fact that it will take place in 1000, but it would still be 10 years older, and someday die. The same thing happens with inanimate objects. Imagine that you have shifted his speech on receiving the Oscar, and then climbed into a time machine and went back 30 minutes back when still remembered where she was, took it, and went back through the tear in time and sent her on her performance Lincoln. But we will return to this in paragraph number 3.

By the way: any object traveling in time, at the time of travel or as not recorded in history. 100 million years the paper will turn to dust, like the traveler himself. But the show must go on, and Oscar will go to the same person who will accept it without question, because it no longer exists outside of history, to bring her back to him in the future.

Now imagine the transfer of the information back to the future. Imagine that you’ve invented a time machine and used it to travel to the past 1000 years. You share your knowledge about time travel with people of this age, and they begin to use it. In 1000 you invent a time machine, go back in time … and so on. But then we have a problem, since there can be more than one source of something, eventually the invention of time travel will lose their own, and the time of occurrence of this invention is as indefinable as the result of dividing by zero.

2. Theory of the weak form of cosmic censorship
Stephen Hawking throughout his career, he worked with black holes, and a large part of what we know about them, based on his works. The surface of the black hole is event horizon, and as soon as an object crosses it and enters the hole, it ceases to exist in our space-time. It will attract an incredibly powerful gravity in an infinitely thin beam of energy, which is called a singularity.

In his works, Hawking presents the theory that only a terrifying energy of black holes can create a singularity. Theory of the weak form of cosmic censorship states that there is no singularity, not hidden by the black hole, and that the singularity will never be open to human observation. Singularity – the main topics dealt with cosmology, as one of the theories about black holes characterizes them as gravitational fields so strong that they give all their constituent objects superluminal velocity. Singularity – the engine of gravity of black holes.

So, if the spacecraft would break the light barrier, he would have to fly through a black hole, and when he flew on the other hand, he would have continued to move with the same speed – that is, the ship would be launched on FTL so that he could return to Earth at some point in the past.

But no object can survive the black hole singularity. Item can simply be destroyed, apparently violating the law of conservation of mass. So, until it is proven that the singularity can exist outside the black hole, this method of travel to the past is impossible.

3. Molehill Breaking the Laws of Physics
All our ideas about time travel based on what we know about the physical properties and relationships of the universe. In this case, we decided that a group of mathematicians, quite far from physics, will describe the physical laws at the microscopic level, and called it quantum physics. This group has also launched a powerful theory about the existence of Einstein-Rosen bridges, named after the two scientists who made the greatest contribution to our understanding of this topic.

These bridges more often called wormholes or wormholes, because they are similar to the burrows, dug in space-time. If we could take advantage of them, the closest distance between two points in space-time would have equaled not a straight line, and zero, which is associated with the piercing of space-time at the point of origin and point of destination, like breaching holes in a sheet of paper; then there would be instant folding space-time until the two would not have reached the point of contact with each other, and then the traveler would move from point A to point B, and the space-time would be unfolded to its original position. It would not require any physical effort, although the destination might be on the other end open at the time of the universe, and the spacecraft would not close and has surpassed the speed of light, he would have just teleported.

It seems like it would give the opportunity to travel back in time without reaching the speed of light, but no one takes into account what is happening inside the molehill. Physicists have no idea about it, and sometimes recognize the possibility that within the holes there are no laws of physics in the form as we know them, or they were not there at all. If we try to understand the journey through the worm-holes from the point of view of physics, then we do not even have a starting point for research, and we have not even gone through this and the first stage.

4. No tourists from the Future
Let’s move away from mathematics, for the theory, which adhere to the brightest minds of the mathematical community, including Stephen Hawking, already has the perfectly comprehensible evidence that travel faster than the speed of light is impossible: as far as we know, none of us people from the future. It is for this purpose, academics and even plain old lovers of science fiction created by the meeting at which they discussed the matter, waiting for visitors from the future. The idea was that in the future people would know that such meetings in the same way as we now know about the Second World; for us this story. So, if time travel could ever become a reality, travelers have long had to go back from the future and to prove the possibility of such movements.

But, of course, nothing happened, and since we’re talking about the whole future from now until the end of time, it must be quite a lot of travelers from different points in the future, appearing in various moments of his past. But there is a funny criticism of this view, which consists in a fair question: How is it that someone will return in our time? Travel to September 1, 1939 still has some meaning, but in the present day? If they wanted to warn us about something, what would it be? They that go back with some brilliant philosophy on how to create world peace?

Imagine: you can move to any point in the past where you wish. What do you want to see? 90% or more prospective travelers will want to find out whether there was in fact Jesus Christ. But would you want to go back now to prevent an imminent war between Israel and Hamas? While no one tried.

5. Paradox Twins
This paradox is discussed in more detail in future travel. It implies a theoretical story of two babies, quite identical twins, one of which remains in the world, and the second – a journey to Proxima Centauri, the nearest star at a distance of 4 light-years. If the spacecraft will move at a speed equal to 80% of the speed of light, which, oddly enough, it seems quite realistic, traveling both ways will be 10 years. This means that the remaining twin on Earth is 10 years older than when his brother back.

But the ship crew is watching as Proxima Centauri and Earth move relative to the spacecraft, and this leads to the fact that the distance from point A to point B is reduced to 2.4 light-years instead of 4. Each leg of the journey takes 2.4 light-years, which, divided by the rate – 80% of the speed of light – make the flight duration of 3 years, 6 years in both ends. Thus, twin onboard to grow by 6 years in the same period of time. It does not seem logically impossible.

But that looks absolutely impossible, because if it’s one of the twins will travel at 101% or more of the speed of light. This will make him, at least according to the above scenario, as we understand it, to the past and cease to exist, ie disappear from the ship, and did not return to his brother on Earth.

6. E = MC squared.
The most famous equation in the history of mathematics describes the equivalence of mass and energy. Notoriously, in 1942 it was used as a great idea to create a new powerful weapons. Einstein had no idea that his creation can be used to create a bigger and better bombs, and just cried when Enrico Fermi and Robert Oppenheimer explained what happened in Oak Ridge, a town in Tennessee.

Besides explaining how much energy is contained in the subject in which the mass equation also provides an explanation of what happens to the mass when it is moving faster. The faster moving any body, the more energy is required to maintain this movement. If an object reaches the speed of light, it reaches infinite mass, and hence requires an infinite energy to continue their movement.

That does not make it impossible to travel to the future, because all that is needed for this project – to reach the speed of light. In fact, you move into the future, even when you go to the kitchen to take a bottle of beer. The distance at which you advance in the future, too small to worry about him. But, technically, you can also type the exact same small amount of mass. The energy required to move a large object such as a spacecraft, to any considerable distance into the future, if you stick to our coordinate system, is greater than or equal to the energy contained in the now VY Canis Majoris, the largest known star among us.

But speeding light traveler moves in the past, and it will require endless, or even more than limitless, amounts of energy. And this can not be achieved.

7. Temporary Loop
This paradox is also considering one particular scenario: the invention of the first time machine. Inventor back into the past in an attempt to get their grandparents fall in love, and accidentally kills his grandfather. Then, not wanting to disappear from the future, he sleeps with his grandmother and the future becomes the father of his father, by doing so, their existence possible in the future to return to the past, to be a father again, his father and so on.

This paradox is illogical, because it describes the effect in the future, which occurred before it will cause in the past. Imagine that you had to go back in time before the Big Bang, some way to arrange the Big Bang, and using this to create the universe. According to the rules of fate it will give you the opportunity to be born through 13.5 billion years to create a time machine and go back in time to create the universe, to a time machine could be invented. And then this process initially meaningless.

8. Paradox of Time
This paradox is, in fact, – the negative version number 3, which is also called the “paradox of the murdered grandfather.” Journey to the past would be quite impossible, because it will provide an opportunity to go back and kill himself. But if you die, who will return to the past to kill himself? Critics, especially fans of science fiction, immediately respond that our understanding of mathematics is developing every day thanks to people like Newton, Einstein, Hawking and Michio Kaku, and with that comes and develops understanding of the logic of time travel.

Best reality argument against the paradox of time – this Multiverse, which is filled with an infinite number of projections of the same person doing the infinite number of things in infinite number of moments of his life. You can slay a hundred years in a drunken brawl in another universe, but you will die of cancer as a child, in this. Our current understanding of quantum mechanics and quantum physics gives ample reason for the existence of the multiverse. This means allowing time paradox and some others, and it will give you the future after you have killed themselves in the past. But still not fully formed theory of the existence of the multiverse, and yet its existence has not been proven, time paradox occurs.

9. Absence of  Theory of Everything 
estno speaking, previous articles based more on logic rather than pure mathematics, but we can only riddles about everything about time travel, based on our superficial understanding of the issue. The whole life of Albert Einstein was focused on what we now call a relative. He created two theories about it, but the next stage, more important, was associate general relativity and electromagnetism. Einstein died without completing work on this, and today’s great minds too far from him gone. High form of modern mathematics is called M-theory, which has still not been fully set forth. It – almost a religion for mathematicians, because it is so unclear and has not been studied, in that some do not even believe it.

This theory describes 11 dimensions of the universe instead of the usual four, and its leaders in the study expect that he will be able to combine five different string theories that preceded it; and to think that may be the only remaining step to its formation: the union of the physical characteristics and laws of all four fundamental interactions of the universe. M-theory seeking common ground General Relativity and quantum gravity in terms of combining all four interactions. Make it look mean from a mathematical point of view as to how the universe came and how it has evolved, when there was an infinitesimal point of creating all that matter and energy, which is enclosed in it now. Understanding this level of mathematical physics will require an understanding of how to manage the space-time and project time in the future and return to the past time. But nobody will unite all 4 interaction in one physical education, extending to every segment of space-time, we can not achieve when-will.

 
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Posted by on April 25, 2014 in miracles, Nature

 

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