Harmonic coordinate
= Harmonic coordinate
{wiki}
A harmonic coordinate satisfies $\Box_gx^\lambda=0$, equivalently $g^{\mu\nu}\Gamma^\lambda_{\mu\nu}=0$ or $\partial_\mu(\sqrt{-g}\,g^{\lambda\mu})=0$.
= Harmonic coordinate
{wiki}
A harmonic coordinate satisfies $\Box_gx^\lambda=0$, equivalently $g^{\mu\nu}\Gamma^\lambda_{\mu\nu}=0$ or $\partial_\mu(\sqrt{-g}\,g^{\lambda\mu})=0$.