 Schwarzschild tortoise coordinate

ID: schwarzschild-tortoise-coordinate

Codex  0 Created 2026-09-24 Updated 2026-10-03

The tortoise coordinate satisfies

\frac{d r _{*}}{d r} = (1 - \frac{2 M}{r})^{- 1}, r_{*} = r + 2 M lo g \frac{r}{2 M} - 1 .

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