Time Travel

The attempt of travelling in time seems to be a far-fetched idea for now. But can we create something like a worm hole.

A wormhole is basically a shortcut through spacetime. In other words it has the tendency to curve space and time just like gravity does. The shape of the wormhole has been assumed to be something like a circle. But the reality is different. It might be a sphere. When time is taken as a temporal dimension, other than the three spacial dimensions, it can move back and forth. This states that as we can travel in the future, we can also return back to the original time.

This case is not possible when we travel around the black hole with greater speeds to slow down time. So a wormhole could be another possible way of traveling through time. These wormholes are not witnessed at the macroscopic level. But there is a ray of hope at the quantum level.

If we can unify the laws of quantum mechanics with the laws of gravitation into a single continuum, then we can develop the concept of time travel furthermore.

A Time Machine

The Concept of a time machine is the oldest known fantasy of man-kind. Various theories have been proposed to travel faster in time. This reaches to the concept of absoluteness of light.Light is a funny thing. It has the tendency to slow down time. In fact, it travels at 300 thousand Ks in a sec. It also states the person standing next to us is seen after a billionth of a sec.

It means we live in the past. It might sound a bit odd but yes it happens.Time varies as t=[1-(v^2/c^2)]^0.5*t where your velocity is v and c is the speed of light. So, it is clear from the equation that no material particle can travel at a speed greater than light. If we travel at appreciable fractions of the speed of light, say,v=0.8c then according to it, the 10 hours will look like 6 hours to you compared to the outer world.This means you are 4 hours younger than your counterparts and indeed you have reached your future. So at the speed of light, the time completely stops for you. This indeed means that you yourselves have stopped, your heartbeat has stopped and your brain has stopped working.

Time dilation is another concept. It owes to the greatest genius of all time, Albert Einstein. He introduced the special and general theories of relativity. (E=mc^2)

However, it is believed that if you travel faster than the speed of light, you overtake the light and when you finally stop after some time, the light reaches to you once again and when things happen twice, you are said to be in your past.

Some believe travelling in future can be possible but not the past because it is capable of producing mind-wobbling paradoxes. Say if you go into your past, and kill your grandfather before he met your grandmother, you yourself would have probably not existed. (Think??)