The idea of Time Travel began with the proposition of one of the most important Scientific Theory i.e, The Theory of Relativity by Albert Einstein in the early 20th Century.
Since then it has attracted hundreds of Scientists to work upon the problem.
Its popularity can be visualized by the fact that even some of the kid cartoon series bears concepts of Time Travel using a Time Machine.
Not only kids but even some of the Brilliant minds that ever existed on the planets were fascinated by this Idea of Time Travel
So today we are going to present some of the current Theories that may open a door towards accomplishment of our notion of Time Travel.
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1.) Special space time geometries
Before describing the Special Space-Time Curve, let us Understand, what space time actually is ->
In the context of Non-relativistic classical mechanics,time is treated as a universal quantity of measurement which is uniform throughout space and which is separate from space. Classical mechanics assumes that time has a constant rate of passage that is independent of the state of motion of an observer, or indeed of anything external. Furthermore, it assumes that space is Euclidean, which is to say, it assumes that space follows the geometry of common sense.
However,in the context of special relativity, time cannot be separated from the three dimensions of space, because the observed rate at which time passes for an object depends on the object's velocity relative to the observer. General relativity, in addition, provides an explanation of how gravitational fields can slow the passage of time for an object as seen by an observer outside the field.
But following the development in later years,
The general theory of relativity was brought up to expand the special theory to cover gravity, illustrating it in terms of curvature in spacetime caused by mass-energy and the flow of momentum. General relativity describes the universe under a system of field equations , and there exist solutions to these equations that permit what are called " closed time-like curves ", and hence time travel into the past. The first of these was proposed by Kurt Gödel , a solution known as the Gödel metric , but his (and many others') example requires the universe to have physical characteristics that it does not appear to have.Whether general relativity forbids closed time-like curves for all realistic conditions is unknown.
2). No-communication theorem
When a signal is sent from one location and received at another location, then as long as the signal is moving at the speed of light or slower, the mathematics of simultaneity in the theory of relativity show that all reference frames agree that the transmission-event happened before the reception-event. When the signal travels faster than light, it is received before it is sent, in all reference frames. The signal could be said to have moved backward in time. This hypothetical scenario is sometimes referred to as a tachyonic antitelephone.
Quantum-mechanical phenomena such as quantum teleportation , the EPR paradox , or quantum entanglement might appear to create a mechanism that allows for faster-than-light (FTL) communication or time travel, and in fact some interpretations of quantum mechanics such as the Bohm interpretation presume that some information is being exchanged between particles instantaneously in order to maintain correlations between particles.This effect was referred to as " spooky action at a distance " by Einstein.
Wormholes are a hypothetical warped spacetime geometrics which are permitted by the Einstein field equations of general relativity. To travel through a wormhole, A proposed time-travel machine using a traversable wormhole would hypothetically work in the following way: One end of the wormhole is accelerated to some significant fraction of the speed of light, and then brought back to the point of origin.
Alternatively, another way is to take one entrance of the wormhole and move it to within the gravitational field of an object that has higher gravity than the other entrance, and then return it to a position near the other entrance. For both of these methods, time dilation causes the end of the wormhole that has been moved to have aged less, or become "younger", than the stationary end as seen by an external observer; however, time connects differently through the wormhole than outside it, so that synchronized clocks at either end of the wormhole will always remain synchronized as seen by an observer passing through the wormhole, no matter how the two ends move around. This means that an observer entering the "younger" end would exit the "older" end at a time when it was the same age as the "younger" end, effectively going back in time as seen by an observer from the outside. One significant limitation of such a time machine is that it is only possible to go as far back in time as the initial creation of the machine in essence, it is more of a path through time than it is a device that itself moves through time, and it would not allow the technology itself to be moved backward in time.
According to current theories on the nature of wormholes, construction of a traversable wormhole would require the existence of a substance with negative energy, often referred to as " exotic matter ". More technically, the wormhole spacetime requires a distribution of energy that violates various energy conditions , such as the null energy condition along with the weak, strong, and dominant energy conditions. However, it is known that quantum effects can lead to small measurable violations of the null energy condition, and many physicists believe that the required negative energy may actually be possible due to the Casimir effect in quantum physics. Although early calculations suggested a very large amount of negative energy would be required, later calculations showed that the amount of negative energy can be made arbitrarily small.
Credits : Their information published is for knowledge purpose only. The credit for above info goes to
Wikipedia.Org & other Independent Sources
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