Geometry and Perturbative Sensitivity of non-Smooth Caustics of the Helmholtz Equation

Zachary Guralnik, Charles Spofford, Katherine Woolfe

The geometry of non-smooth $A_{n>2}$ caustics in solutions of the Helmholtz equation is analyzed using a Fock-Schwinger proper-time formulation. In this description, $A_3$ or cusp…