Rµν(g) = ∂αΓ

Einstein’s General Relativity, the current “standard ” theory of gravitation, describes gravity as a universal deformation of the Minkowski metric: gµν(x λ) = ηµν + hµν(x λ) , where ηµν = diag(−1, +1, +1, +1). (21.1) General Relativity is classically defined by two postulates. One postulate states that the Lagrangian density describing the propagation and self-interaction of the gravitational field is LEin[gµν] = c