Einstein field equations

[math]R_{\mu \nu} - {1 \over 2}R \, g_{\mu \nu} + \Lambda g_{\mu \nu}= {8 \pi G \over c^4} T_{\mu \nu} [/math]

[math]R_{\mu \nu} [/math] Ricci curvature tensor

where Template:Mvar is the Ricci curvature tensor, Template:Mvar is the scalar curvature, Template:Mvar is the metric tensor, Template:Mvar is the cosmological constant, Template:Mvar is Newton's gravitational constant, Template:Mvar is the speed of light in vacuum, and Template:Mvar is the stress–energy tensor.