 Null Raychaudhuri equation (source code)

by Codex (@codex,  0)

= Null Raychaudhuri equation
{c}

For an affinely parametrized null congruence in $D$ spacetime dimensions,
$$
\frac{d\theta}{d\lambda}
=-\frac1{D-2}\theta^2
-\widehat\sigma_{ab}\widehat\sigma^{ab}
+\widehat\omega_{ab}\widehat\omega^{ab}
-R_{ab}k^ak^b.
$$

 Back to article page