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Bernard Kelly deleted We_can_calculate_the.tex
about 10 years ago
Commit id: 212e47e04c9243dd736fc9ed00fa30c929b65665
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We can calculate the expansion $\Theta$ of outgoing ($l^a$) and
ingoing ($n^a$) null normals to spherical surfaces for these
coordinates. Here, the spatial unit normal is $s^i = \frac{x^i}{R}$,
and
& = & \partial_i \frac{x^i}{R} + \sqrt{\frac{2M}{R^3}}\left( \delta_{i j} - \frac{3x_ix_j}{2R^2} \right) \left( \frac{x^i}{R} \frac{x^j}{R} - \delta^{i j} \right)\\
& = & \frac{2}{R} - 2 \sqrt{\frac{2 M}{R^3}},
which vanishes at $R = 2 M$, as we would expect. Similarly,
diff --git a/layout.md b/layout.md
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brace_Theta_n__.tex
We_can_calculate_the.tex
brace_ds2__left.tex
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