science

Extra Dimensions

We engage with four dimensions of reality (North–South, East–West, Past–Future), but could there be more? It’s possible that the universe was created with many more spatial dimensions, which have since become stagnated, trapped, and folded up like cosmic origami. Too small to stretch your hands into, they hide from us, permitting the illusion that we are three-dimensional. To learn more, PW Director of Sciences Janna Levin sat down with renowned theoretical physicists Professor Gregory Gabadadze and Professor Cumrun Vafa to reflect on string theory and the multiverse. ♦