" Because both quantum theory and Einstein's theory of gravity are united in ten-dimensional space, we expect that the question of time travel will be settled decisively by the hyperspace theory. As in the case of wormholes and dimensional windows, the final chapter will be written when we incorporate the full power of the hyperspace theory. "

― , Hyperspace: A Scientific Odyssey Through Parallel Universes, Time Warps, and the Tenth Dimension