Scarred quantum wave Computer model showing the paths taken by a wave trapped inside a stadium shaped cavity The paths show the movement of a particle which is behaving like a wave showing waveparticle duality as it bounces around the cavity The pattern has features characteristic of classical and quantum mechanics It is similar to a random quantum wave formed by randomly adding together waves travelling in all directions However it is known as a scarred quantum wave because it features classical periodic orbits repeating paths which give it symmetry forming a double diamond Modelled by Professor Eric Heller at Harvard University USA