Time Traveling.

Firstly we need to know about time. Time is just a continued sequence of events that occurs in an apparently irreversible succession from the Past, through the Present into the Future. Time is considered as the 4^th dimension in total 11 dimensions. Time travelling mean we have move within the time from present to past or present to future and visa – versa.

Time is one of the most unique and interesting topic in our world. Some of the scientist say that time travelling is not possible but some of them do not get agreed that they may consider the time travelling is possible in some way.

The brightest minds have been trying to answer this question and formulates the main regularities related to this process for year. Beside the rapid evolution of science and technologies renewed interest in this topic and gave rise to vigorous debates around the possibility and impossibility of time travels. The discovery of wormholes also preconditioned the undying interest in the topic. There are several modern theories that could be explored to prove either the possibility or impossibility of time travels. The complexity of the time travelling gave rise to numerous speculation about the creation of the machine that could allow a person to move from one timeline to another.

 

There are some theories of the brightest mind lead to travel in different timelines as follows :-

 

• Neutron Star Theory :-

A neutron star is a type of stellar remnant that can result from the gravitational collapse of a massive star. These stars have a mass around 466,000 times the mass of the earth, thus exerting a very high gravitational force (1.962×1012 m/s2, earth’s is 9.81 m/s2) although they have a diameter of 10-12 Km.[2] As for the Gravitational time dilation, time would pass 30% slower on the surface of such a star, meaning that if someone could travel to such a star and withstand this gravity, they would have a way to “travel” to the future.

• General Theory of Relativity :-

Time travel to the past is theoretically possible in certain general relativity spacetime geometries that permit traveling faster than the speed of light, such as cosmic strings, traversable wormholes, and Alcubierre drives.[26][27]: 33–130  The theory of general relativity does suggest a scientific basis for the possibility of backward time travel in certain unusual scenarios, although arguments from semiclassical gravity suggest that when quantum effects are incorporated into general relativity, these loopholes may be closed.

• Black Hole Theory :-

Black holes are one of the most used  resources in time-traveling novels, next to  wormholes. The Kerr-black hole theory is the result of Roy Kerr's calculations for relativity. A Kerr-black hole is a singularity that possesses mass and angular momentum, but does not possess electrical charge. This hole spins around a central axis and has two event horizons, which contain a ring-formed singularity. Crossing the singularity would make you end up in a "negative space" (the definition is still unclear). Avoiding it would cause you to go back in time while you are crossing the first event horizon. Here's a Penrose diagram of two time travelers making their way through the black hole. The dark-blue one avoids the singularity and the light blue one crosses it.

One side Black Hole and other side Wormhole 

•  Wormhole Theory :-

There are two holes present in the universe one hole is called as Black Hole that is known by everyone whereas another hole is called as Wormhole. This theory describe the phenomena occurred in Wormhole. It is considered that Black Hole and Wormhole are connected to each other through a point known as point of singularity that make a tunnel. The wormhole tunnel is all squished and squashed like this fist of mine. In order to pass through, you need something inside of my hand to oppose the ‘grasping force’ so that I can not squish anymore. Wormholes may not only connect two separate regions within the universe, they could also connect two different universes. Similarly, some scientists have conjectured that if one mouth of a wormhole is moved in a specific manner, it could allow for time travel. “You can go into the future or into the past using traversable wormholes” astrophysicist Eric Davis told LiveScience. But it won't be easy: “It would take a Herculean effort to turn a wormhole into a time machine. It's going to be tough enough to pull off a wormhole.” However, British cosmologist Stephen Hawking has argued that such use is not possible. “A wormhole is not really a means of going back in time, it's a short cut, so that something that was far away is much closer,".

 

There are some movie they show the time traveling such as Interstellar a Hollywood movie, 24 a Tamil movie and other.

~ Interstellar:-

In this movie a space scientist traveling to future though a Wormhole near  Saturn in search of new home for mankind. One of the traveler sacrifice himself dropping into the Black Hole. Then he is falling past the event horizon there he find himself in the fifth dimensional tesseract. He deduces that it was placed there by future humans with access to higher dimensions, as was the wormhole. His mission is now complete, and he is ejected by future beings from the tesseract. He is sent back through the wormhole and picked up by a ranger orbiting Saturn. Due to the time slippage around Gargantua, he make a time travel of ninety years have passed in Earth-time.

~ 24:- In this movie the hero travel to past by using a watch that was made by his father in movie to make him alive. In starting of movie the watch is used to travel one day past or future then the hero modifying it , to make it possible to move in past or future for long time.

In future it may possible to travel in timelines scientist make a time machine or a machine that have speed approximately speed of light that  time traveling  possible.

   -By Mratyunjay Saxena