Figure 27: Instantaneous wave fronts in
the spacetime of a non-transparent string of finite radius
with and . The picture shows in
3-dimensional space the intersections of the light cone of Figure 24 with
three hypersurfaces , at values . The vertical coordinate is the -coordinate which was suppressed
in Figure 24. Only one half of each instantaneous wave front is shown so that one can
look into its interior. There is a transverse self-intersection (cut locus) but no
caustic.
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