Equation Icon  [ ] G μν + 8 R μρνσ + R ρνgσμ − R ρσg νμ − R μνgσρ + Rμσg νρ + (R ∕2)(gμνgσρ − gμσgνρ)∇ ρ∇ σf,𝒢 + (𝒢f − f)g = κ2T , (12.10 ) ,𝒢 μν μν