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The theory is that a wormhole is actually two black holes linked by quantum entanglement, which can arise in two different ways. Some have theorised that wormholes are linked by a concept known as quantum entanglement, where particles have linked behaviour even at great distances.
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Wormholes connect distant regions in a region in space-time which has a negative curvature, which can be kept open using matter with negative energy density.
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According to Professor Hawking, observations of the Universe have shown that it is not sufficiently warped, leaving only the third possibility valid - wormholes. In the bestselling book “A Brief History of Time” by the late Stephen Hawking, three means of time travel were proposed, firstly in a universe where space-time is sufficiently warped, secondly if one travels faster than light and lastly if one is able to travel through a moving wormhole. Time travel has always captured the popular imagination.
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