In the paper, entitled 'Traversable wormholes in four dimensions', the Institute for Advanced Study's Juan Maldacena, alongside Princeton Physicists Alexey Milekhin and Fedor Popov declared: “We have constructed a traversable wormhole solution in four dimensions.” The physicists state that, "this would be achieved by placing a large magnetic charge close to extremal black holes.” The scientists explained that rotating the black holes was important, "so that they can be kept apart, at least for a while until the electromagnetic radiation causes them to lose energy and eventually merge with each other.”

The resulting wormhole “can be viewed as an entangled state of two black holes.” The physicists describe in the paper how they have displayed a solution of an Einstein Maxwell theory with charged fermions. The said: "It is a traversable wormhole in four dimensions and with no exotic matter. "It balances classical and quantum effects and it has a non-trivial spacetime topology, which is forbidden in the classical theory."

A wormhole

Black holes are powerful wells of gravity where absolutely nothing, including light, can escape their pull. Scientists are, however, uncertain what exactly happens to an object once it is pulled into a black hole. Does the intense gravity crush the object into nothingness or does a black hole spit it out in some remote part of the universe? Some scientists theorise black holes act like wormholes between two points in time and space. If correct, such wormholes could be used to instantly travel vast distances and maybe even travel through time. JUST IN: Black hole shock: Human body would be ‘turned to spaghetti’

A black hole

A black hole

“Einstein’s equations do predict that black holes might be used as time machines or gateways to other universes but these equations are unreliable because the gravitational force at the centre of a black hole becomes infinite, and that’s nonsense.” But the answer to the question of what happens when you pass through a black hole might be hidden in the study of String Theory. According to Dr Kaku, String Theory proposes the universe is a bubble of sorts, in which case other bubble-like universes exist, expand and collide with one another. Dr Kaku said: “But what about time travel? Again we have to rely on String Theory but String Theory is not advanced enough to answer that question.

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