Equation Icon  ∫ τ− ( ) htail = 4m ∇ G ′ ′ − 1-g G ρ ′ ′ (z(τ),z(τ′))uμ′uν′d τ′. (19.83 ) μνλ −∞ λ +μνμ ν 2 μν + ρμ ν