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so_gr_lo posted the thread Show that radial worldlines with u = const are outgoing null rays in Advanced Physics Homework Help.

$$ ds^2 = -(1-\frac{2M}{r'})(\frac{\frac{r'}{2M} -1+2M}{\frac{r'}{2M}-1})(dr')^2+(1-\frac{2M}{r'})^-1 (dr')^2 $$

Apr 26, 2024

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