IF YOU want to time-travel through wormholes – theoretical space-time “tunnels” that could act as short cuts through the universe – be prepared to choose between not knowing where you’ll arrive or not arriving at all.
In theory, wormholes work when they are coated with a mysterious form of matter that exerts negative pressure. If a balloon were filled with the stuff, it would deflate. Physicists Roman Buniy and Stephen Hsu at the University of Oregon in Eugene calculated the properties of two types of wormholes with this exotic matter: one that follows the laws of classical physics and another that follows…
