Formula_24228

\[d s^{2}=c^{2}\left(1-\frac{r_{g}}{r}\right) d t^{2}-\left(1-\frac{r_{g}}{r}\right)^{-1} d r^{2}-r^{2}\left(d \vartheta^{2}+\sin ^{2} \vartheta d \varphi^{2}\right) .\]