Cosmologists spot a 'knot' in space-time


By Zeeya Merali A GIANT knot may have been found in the fabric of space-time – almost a decade after cosmologists abandoned the idea that such objects might exist. Known as “topological defects”, such esoteric entities were first proposed in the 1970s, when physicists realised that the processes that gave rise to particles and forces in the early universe could also fracture space, creating twists and knots, dubbed textures, or “cosmic strings” that stretch across the universe. The idea attracted attention because Neil Turok at the University of Cambridge, and others,
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