STEPHAN HAWKING-TIME TRAVEL THEORY (2024)

What is time? Is time travel possible? Today, we know that time travel indeed exists beyond myths, science fiction, and Hollywood movies.

According to Stephen Hawking, time travel is possible, and not just in the way we might think. Backward time travel is not supported by Hawking’s theories, because new matter (a new you) would need to be created – one existing in the past and one in the present, traveling back in time. This doesn’t hold up, because matter cannot be created. However, time travel to the future is possible if gravity warps the space-time continuum. Anytime you climb a mountain, fly in a jet from place to place, or even ride in an elevator, you alter the speed at which you get to the future because you are encountering a change in gravity’s pull. Time goes faster when there is less gravitational force at play.

Wormholes

Einstein also told us that the force of gravity is a consequence of the way mass warps space and time. The more mass we squeeze into a region of space, the more spacetime is warped and the slower nearby clocks tick. If we squeeze in enough mass, spacetime becomes so warped that even light cannot escape its gravitational pull and a black hole is formed. And if you were to approach the edge of the black hole – its event horizon – your clock would tick infinitely slowly relative to those far away from it.So could we warp spacetime in just the right way to close it back on itself and travel back in time?

The answer is maybe, and the warping we need is a traversable wormhole. But we also need to produce regions of negative energy density to stabilise it, and the classical physics of the 19th century prevents this. The modern theory of quantum mechanics, however, might not. According to quantum mechanics, empty space is not empty. Instead, it is filled with pairs of particles that pop in and out of existence. If we can make a region where fewer pairs are allowed to pop in and out than everywhere else, then this region will have negative energy density.

However, finding a consistent theory that combines quantum mechanics with Einstein’s theory of gravity remains one of the biggest challenges in theoretical physics. One candidate, string theory (more precisely M-theory) may offer up another possibility.M-theory requires spacetime to have 11 dimensions: the one of time and three of space that we move in and seven more, curled up invisibly small. Could we use these extra spatial dimensions to shortcut space and time? Hawking, at least, was hopeful.

He told that, making these small wormholes into large wormholes he also believe that wormholes can reach the size thateven anspaceship can easily enter into it. Also he thinks science still not found some more dimensions for that.

Will we ever have the technology to travel forward, or even backward, in time?

It is nearly impossible to predict what future technology might be discovered to help us time travel. History is full of many examples showing how humans have underestimated technology and what it can do:

"The telephone has too many shortcomings to be seriously considered as a means of communication. The device is inherently of no value to us." (Western Union internal memo, 1876)"There is no reason for any individual to have a computer in their home." (Ken Olsen, president, chairman and founder of Digital Equipment Corp., 1977)Science fiction helped prompt humans to travel to our nearest neighbor in space – the Moon. Perhaps science-fiction stories about time traveling will inspire humans to develop the technology to make time-travel possible.

But still according to him ,travelling to the past is so dangerous because may be the history gonna be change .