Time travel- ENDGAME logic & its practical application in the Real World.

Time travel has been a hot topic in sci-fi movies since I can remember but is there an actual logic to the concept or is it just a fictional myth.  After the release of Avengers Endgame movie, the topic has been in the center stage of debate once again. Here is how the movie explained it:    

‘’ If you travel back to your own past, that destination becomes your future, and now your former present becomes the past, which cant now be changed by your new future.’’ – HULK

Hence according  to this if you change the past, you create a new parallel universe that branches off from the moment you changed said past — but when you travel into the future, you return to your original future, not the new one created by the changes you made in the past. If it sounds like a complicated theory, it still makes more sense than the concept of other time travel related movie. But the real question stands, is it at all possible to apply it in realty.

 According to Einstein our universe has four dimensions: the three dimensions of space and one of time. So traveling back in time is nothing more or less than the fourth-dimensional version of walking in a circle. All you would have to do is use an extremely strong gravitational field, like that of a black hole, to bend space-time. From this point of view, time travel seems quite difficult but not obviously impossible.

A causal loop is a paradox of time travel that occurs when a future event is the cause of a past event, which in turn is the cause of the future event. Both events then exist in space-time, but their origin cannot be determined.

Even if we succeed in theoretically perfecting the concept, practical application would still be close to impossible.  Technology has advanced to an alarming rate in the last two decades, hence who knows maybe in the next century or two human race finds a way to solve this long overdue debate and makes a time machine, because as they say nothing is truly impossible.