QUANTUM IMPLICATIONS OF RAY SPLITTING

Ray splitting is a universal phenomenon that occurs in all wave system s with sharp interfaces. Quantum implications of ray splitting are: (i ) the importance of non-Newtonian orbits for the density of states in the semiclassical limit, (ii) ray-splitting corrections to the average density of states and (iii) the need to include non-Newtonian orbits in trace formulas for the oscillating part of the density of states. T he signatures of non-Newtonian orbits in the density of states have re cently been identified experimentally.