Is time travel possible in reality? If so, are wormholes the port key in building time machines?
You may find it crazy but it seems that the idea of time travel is theoretically possible.
I know what you're thinking. Our universe can be a bit unexpected at times. In the past few decades, physicists have been exploring different possible results of Einstein's general theory of relativity and field equations, whose mathematical solutions predicted the existence of wormholes. Einstein himself has made it clear that anything that travels faster than the speed of light can actually travel backwards in time. We are talking about traversable wormholes that can take you to different locations in space-time even if those locations are light years apart.
A wormhole is a tunnel of space-time that has an opening and an ending at different places in space-time. To make its concept clear, let's take an example. Imagine that you are leaving for Neptune in a spaceship, to collect some free diamonds (for a fact, it does rain diamonds in Neptune from its sky), and come back to earth. It will take about twelve years for the spaceship just to reach Neptune. So altogether, a round trip of about 24 years would be taken for this voyage. But if there's a wormhole in action and no spaceships involved, you could just have a wormhole that opens right in your living room and ends in Neptune. And if you travel through the wormhole, it would only take approximately 4 hours from earth to the outer planet, provided that we travel near to the speed of light through the wormhole. So clearly, wormholes give us the possibility to explore deep space regions which are thousands of light away in just a few hours.
Building a time machine through wormholes
The concept of wormholes used as time machines might be actually easier than you expected. By keeping the exit hole accelerating (moving) while the entry hole is stationary, you can create a natural time machine.
Take the same example mentioned above. Imagine that you have a wormhole opening in your living room and its other opening in your spaceship. You planned to set a voyage to Neptune. With a wormhole open in your room, you take your spaceship, travel at the speed of light and reach the planet in 4 hours. If you are to return back to earth at the same speed in your spaceship, which adds up to 8 hours in total, you will find that your house looks 24 years older than when you've left, when the time you've taken was only 8 hours. But then you realize that you have a wormhole connected to the spaceship and your room. Imagine that you go into the wormhole in your spaceship and you reach your living room. But you will find that your house looks only 8 hours older.
So in reality, you've travelled 24 years back in time when you climbed the wormhole into your living room. This paradox happens because you travelled at the speed of light that you thought you only lost 8 hours when actually it was 24 years!! The wormhole was acting as the time machine or link the whole time while you were on your voyage.
If you have noticed earlier, I've mentioned that time travel was possible in mathematical proofs or in theory. Is it practically possible in real life? The answer is 'not yet.
First of all, time travel isn't possible if the object cannot travel at the speed of light. But according to physical laws, nothing travels more than or equal to the speed of light. So, even if time travel is possible, it would be violating the universal laws. Moreover, creating a wormhole requires something called 'negative energy' or exotic matter in order to stabilize it. The slightest interaction of particles might lead to the explosion of wormholes because they are highly sensitive.
Physicists still believe that time travel may not be possible because it may disrupt the order of our universe.
However, in the age of quantum teleportation and computing, we cannot completely let go of the idea of time travel!!
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