# Einstein gravity (General Relativity) The dynamics of General Relativity (aka Einstein gravity) is governed by the Einstein-Hilbert action$S=\frac{1}{16 \pi G_N} \int d^{D} x \sqrt{-g}\left[R-2\Lambda\right],$where $\Lambda$ is the cosmological constant, zero for asymptotically flat space and positive(negative) for asymptotically (anti-)de Sitter space. Its equation of motion is given by the famous Einstein's equation $R_{\mu\nu}-\frac{1}{2}Rg_{\mu\nu}+\Lambda g_{\mu\nu}=8\pi G_N T_{\mu\nu}.$ The term "Einstein gravity" is often used to distinguish it from [[0015 Modified gravity|other theories of gravity]] such as [[0006 Higher-derivative gravity|higher derivative gravity]], whereas "General Relativity" is often used to refer to the framework in general.