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What is Time Travel?

What is Time Travel?


Rationally, we are always traveling with time, because we move forward in the future from the past. But time travel usually refers to the possibility of changing the rate at which we travel in the future, or completely reverse it so that we can travel in the past. Although after 19th century a conspiracy instrument (see section on time in literature), time travel has not been practically demonstrated or verified, and it can still be impossible.
Time travel is not possible in Newton's full time (we move firmly and linearly in the future). According to special relativity this is also not possible (we are interrupted by our light cones). But general relativity increases the journey (at least theoretically) of travel through time, i.e. the possibility of movement and / or further possibility of time, as a normal flow while looking at the earth independently, like That we can move between different points in space.
Time travel usually means that the mind and body of a person remain unchanged, their memories remain intact, while their place changes over time. If the passenger's body and mind returned to their destination at the destination time, then no time travel travel would be understandable.
Time Travel Scenarios:-
Although, primarily, apart from the HG Wells concept of a physical machine with liver and dial, many different speculative time travel solutions and scenarios have been further extended in the last few years. However, the real physical viability of these solutions in the real world is uncertain.
However, in addition to HG Wells, apart from the concept of a physical machine with liver and dial, many different speculative time travel solutions and scenarios have been extended in the last few years. However, the real physical viability of these solutions in the real world is uncertain.
However, in some scenarios, the possibility of real-time travel appears to be some scientific basis within the theory of relativity. Kurt Gödel showed in the early days of relativity, that there are some solutions to the field equations of general relativity that describe the space-times so that they can stop "curve like time off," where a personal timing-cone turns and its Closes in you, which allows the path from the present to the distant future or the past. Gödel's solution was the first challenge for the main idea of ​​linear time in the centuries, with most physics remaining. Based on an infinite case solution, an infinite, curved universe (we do not really find ourselves on a finite, non-rotating universe), the other time travel solution has been identified, after which an infinite, winding universe Not required, but they remain disputed.
In the 1970s, controversial physicist Frank Tyler published his ideas for "time machine", using a countless long cylinder that spin with its longitudinal axis, which claims that the laws of physics Will be allowed to travel back and forth on time without violating, although Stephen Hawking subsequently rejected Tipler's ideas.
In 1994, Miguel Alquebier proposed a hypothetical system by which a space shuttle will place a space contract in front of it and extend the space behind it, which will result in a faster journey and therefore (potentially) time It will be a journey, but then the viability of such a construction is prohibited by a "warp drive".
Other theoretical physicists such as Kip Thorne and Paul Davis have shown that a wormhole can theoretically provide an immediate gateway for different time periods in space-time, similarly the general relativity of the theoretical probability of the immediate spatial journey through Warmhole Allows. Vermilocks are short-cut via tube-conditase or space-time, where space-time gets so bad that it comes back on its own, another science fiction concept has created a possible reality of relativity theory. The drawback is that the unimaginable amount of energy needed to bring such type of workflow will be required, although in CERN, Switzerland, experiments are being done in view of the possibility of making mini-wormholes and mini-black holes on the particle accelerator. It seems that such a wormhole will immediately fall into the black hole unless some method of opening it is prepared (possibly the so-called "negative energy", which is thought to be theoretically possible, but which is still practically Is not viable) Stephen Hawking has suggested that the reaction in the sound like radiation will destroy the wormhole, which will not last long enough to use the machine. Actually control (and when) a wormhole emits and is another disturbance.
The possibility of another potential time travel, though some of the long shots related to the universe wire (or quantum strings), the long pieces of energy left after the Big Bang, thin but incredibly dense from an atom, which Weave through the whole universe. Richard Gott has suggested that if two such cosmic wires are close to each other or close to a black hole, then the resulting warship of space-time can be so serious to make a closed-time-like curve. However, the cosmic wire is speculative and the possibilities of finding such an event disappear (and, if it is possible, such a loop can be trapped inside a well-curved black hole).
Physicist Ron Mallet is looking at the possibility of using lasers to control the extreme levels of gravity, which can potentially be used for timely control. According to Mallet, spreading the beam of laser controlled light can lead to similar conditions in the rotating black hole, with its frame-dragging and potential time travel properties.
Other times are looking for quantum mechanics for travel solutions. In quantum physics, the effective meaning of proven concepts like super concept and confusion is that one particle can occur in two (or more) places at a time. An explanation of this (see section on quantum time) is the "many worlds" scene in which all the different quantum states simultaneously exist together in many parallel universes. If we can gain access to these alternative parallel universes, then one type of time travel may be possible.
At the sub-sub-microscopic level - at the level of so-called quantum foam, tiny bubbles of matter a billion-trillion-trillionths of a centimeter in length, perpetually popping in and out of existence - it is speculated that tiny tunnels or Short-cuts through space-time are constantly forming, disappearing and reforming. Some scientists believe that it may be possible to capture such a quantum tunnel and enlarge it many trillions of times to human scale. However, the idea is still a very speculative stage,...
It should be noted that, with all these plans and ideas, it is not possible to travel at any time from time to time, when the travel technique was prepared.
Faster-Than-Light Particles:-
There is a strange theoretical particle in physics called the tachyon that routinely travels faster than light, with the corollary that such a particle would naturally travel backwards in time as we know it. So, in theory, one could never see such a particle approaching, only leaving, and the particle could even violate the normal order of cause and effect. For a tychon, the speed of light is the lower speed limit, while the upper speed limit is infinity, and its speed increases as its energy decreases. Even stranger, the mass of a tachyon would technically be an imaginary number (i.e. the number squared is negative), whatever that might actually mean in practice.
It should be emphasized that there is no experimental evidence to suggest that the tactics are actually present, and many physicists also deny the possibility. A tachian has never been seen or recorded (though the search continues, especially through the analysis of cosmic rays and particle accelerators), and have never been made, so they remain fictional, although the theory is strongly Supports their existence.
Research using minos and opera detectors has suggested that small particles called neutrino can travel faster than light. However, recent research by CERN has concluded the disputes, and the matter is uncertain. Neutrinos are not just fictional particles like Tachian, but rather a famous part of modern particle physics. But they are small, almost-mass, invisible, electrically neutral, weak-interacting particles that are correct through normal matter, and as a result it is very difficult to measure and cope (even their masses Is not accurately measured)
Time Travel Paradoxes:-

The probability of traveling back on time is generally not considered to be far more likely by scientists than in the future. The idea of ​​traveling for time in the past is full of problems, at least temporary contradictions are unlikely because the result is a violation of the violation (i.e. there is a possibility that some effect may occur before for some reason). This is the most famous example by grandfather paradox: If a fictional time traveler goes back on time and kills his grandfather, then the time passenger himself will never be born when he was to be; If he has never been born, though, he is unable to travel through time and kill his grandfather, which means that he will be born; etc etc.
Some have demanded to prove the probability of time travel for the past, that such paradoxes never really arise in practice. For example, the simple journey is that the time traveler is present at the beginning of his journey, it is self-evident that he can not kill his grandfather or in any way can change the past, either because in the past Free wishes are eliminated, or because such results
Decisions are predefined. Or, alternatively, it is argued that, any change made by the traveler at an estimated future should already be in the passenger's past, resulting in the passenger moving forward from reality.
Theoretical physicist Stephen Hawking has suggested that the fundamental law of nature itself - especially the idea that always precedes the effect - can prevent the journey from time to time. Our obvious absence of "tourists from the future" here is another logic, although not a harsh, which has been kept from time to time against the possibility of time travel in technical travel (here is the impression that future civilizations, More technically advanced than millions of years, should be able to travel).
However, some interpretations of time travel have attempted to resolve such potential contradictions by accepting the possibility of traveling between "branch points", parallel realities or parallel universes, so that any new event during the journey of any time The traveler's journey during a different reality and therefore does not have an impact on the original time-stream. The idea of ​​parallel universes, in the first decade of 1950, was put forward by Hugh Everett III in the "many world" interpretation of quantum theory, is now quite mainstream and accepted by many people (though in any way) By physicists.
Also Read: 1.) How the world knew about zero 
                    2.) How the Bermuda Triangle Works ?
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