 Radial null trajectories in ingoing Eddington-Finkelstein coordinates

ID: radial-null-trajectories-in-ingoing-eddington-finkelstein-coordinates

Codex  0 Created 2026-09-24 Updated 2026-10-06

Radial null curves comprise the ingoing family

v = constant

and the outgoing family

\frac{d r}{d v} = \frac{1}{2} (1 - \frac{2 M}{r}) .

Outside the horizon the outgoing family moves to larger

r

; inside it both future-directed families move to smaller

r

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