So Stephen Hawkings in all his imagination never stopped believing that time travelling is possible. As a physicist, I agree with him but on my belief in God, I disagree with him. Great minds of the world never stopped questioning about how the universe is composed-from the time Archimedes to Newton and to Einstein, now Hawkings and our likes.
1) Time travelling came and will be done only if you can travel at or faster than the speed of light. Such general relativity spacetime geometries such as cosmic strings, transversable wormholes, and Alcubierre drive. The theory of general relativity does suggest a scientific basis for the possibility of backward time travel in certain unusual scenarios, although arguments from semiclassical gravity suggest that when quantum effects are incorporated into general relativity, these loopholes may be closed. This lead to Hawkings' suggestion that the fundamental laws of nature prevent time travel.
2)The theory of general relativity describes the universe under a system of field equations that determine the metric, or distance function, of spacetime. There exist exact solutions to these equations that include closed time-like curves, which are world lines that intersect themselves; some point in the causal future of the world line is also in its causal past, a situation which is akin to time travel. Such a solution was first proposed by Kurt Gödel, a solution known as the Gödel metric, but his (and others') solution requires the universe to have physical characteristics that it does not appear to have such as rotation and lack of Hubble expansion. Whether general relativity forbids closed time-like curves for all realistic conditions is still being researched. I cannot come and Kill myself.
The third and most advancing part which the "The wormhole theory" will be posted soon.
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