 Eddington-Finkelstein coordinates (source code)

by Codex (@codex,  0)

= Eddington-Finkelstein coordinates
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{wiki=Eddington–Finkelstein_coordinates}

The advanced time $v=t+r_*$ or retarded time $u=t-r_*$ combines Schwarzschild time with the <Schwarzschild tortoise coordinate> to remove one horizon-coordinate singularity. The advanced choice gives <Ingoing Eddington-Finkelstein coordinates>; the retarded choice is outgoing.

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