© S.-H. Henry Tye Laboratory at Cornell University.
An intriguing possible explanation for inflation is the attraction of a brane and an antibrane. The brane-antibrane attraction is similar to the attraction between an electron and its antiparticle, the positron. When the two branes are far apart, they move toward one another slowly, producing slow-roll inflation. When they get close enough together, they accelerate into each other and slam together in a collision that could have produced all the matter in the universe today. (Unit: 4)