Figure 13: Instantaneous wave fronts of
the light cone in the Schwarzschild spacetime. This picture shows intersections of the light cone in
Figure 12 with hypersurfaces for four -values, with . The
instantaneous wave fronts wrap around the horizon and, after reaching the first caustic, have two caustic
points each. If one goes further back in time than shown in the picture, the wave fronts another time
wrap around the horizon, reach the second caustic, and now have four caustic points each, and so on.
In comparison to Figure 12, the representation in terms of instantaneous wave fronts has the
advantage that all three spatial dimensions are
shown.
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