G_mu_nu = R_mu_nu - 0.5 g_mu_nu R; symmetric divergence-free tensor encoding spacetime curvature in Einstein field equations G + Lambda g = 8 pi T.
G_mu_nu = R_mu_nu - 0.5 g_mu_nu R; symmetric divergence-free tensor encoding spacetime curvature in Einstein field equations G + Lambda g = 8 pi T.