Gravity seminar - Fay Dowker Seminar

The causal set approach to quantum gravity is based on the hypothesis that the fundamental degrees of freedom in quantum gravity are discrete causal relations. I will explain how this discreteness unifies the spacetime manifold with its geometry -- in contrast to continuum spacetime in which the manifold has to have its geometry imposed ``from outside''. I will give an overview of the approach, explain that it is the only approach to quantum gravity that has made an observable prediction that was verified after the fact and mention some recent progress in defining an action for a causal set.