Figure 11: Fermat geometry of the
equatorial plane of the Schwarzschild spacetime, embedded as
a surface of revolution into Euclidean
3-space. The neck is at (i.e., ), the boundary of the
embeddable part at (i.e., ). The geodesics of this surface of revolution give the light rays in the Schwarzschild
spacetime. A similar figure can be found in [4] (also
cf. [160]).
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