WAVE FRONTS IN GENERAL RELATIVITY THEORY

JWFront is a program written in Java to visualize, in two or three dimensions, the wavefronts passing by an object, i.e. a black hole or gravitational lens. The light cones can also be displayed. The caustics for a given metric can be visualized in two or three dimensions. This program has a graphical user interface to control input and output. The implemented metrics so far are: Minkowski, Schwarzschild, and Kerr. We will describe how the program works and present its applications.