Time Travel - Why it cannot happen

There has been long discussions and research over the possibility of time travel & the paradox associated with the same. Of course, not only the great scientists and intellects but also common man often feels fascinated by the topic of time travel. 

In my previous article titled "Time Travel - A Myth that can't change the past" I have put forward my view that - why time travel cannot change the past. Today I am going to put forward the same view in a different way. 

So, time travel considers time as a fourth dimension just like we have three dimensions labelled usually as "X", "Y" & "Z" axis. So, let's call the time dimension the "T" axis. Now before we go to understand why time travel in the past is not possible, lets understand something more simple.

We have an object (lets say a ball) kept at a particular point on the ground. So, its coordinates are "X0, Y0, Z0" Now we apply a force on it to lift it vertically along Z-axis so that its new coordinates are "X0, Y0, Z1" SO, the object has gained potential energy on its way to reaching the new position. Thus the object at the new position is not exactly the same as the object at the previous point. It has a different amount of energy stored in it. Now if the object has to return to its original position, it can't do so without losing its (potential) energy that it had gained previously. 

Now let's replace that object with the time traveler, its movement along Z dimension is replaced by the movement in "T" dimension i.e. time and the energy gained is replaced by the experience and learnings gained over the time by virtue of moving along that axis. Now let's redo the same exercise. Just like the object in the previous example had to return back its energy that it had gained by moving forward along the Z-axis, in order to return back to its original position, the same way a person will have to return back what it has gained while travelling along the time axis. So, by the time it reaches its destination in the past, he won't even exist (assuming he returns to a point of time before his birth). 

Just like one object can't be present at two different coordinates at the same time (X0, Y0, Z0 and X0, Y0, Z1) the same way a person or any object can't be present in two different time dimensions at the same time. So, though some form of communication between time dimensions may become a reality in the future, the physical presence and activities that often lead to paradoxes like grandfather paradox may not actually happen.