Equation Icon  ( ) ∫ − μ 2 μ μ 2 ν 1 ν λ 2 τ [μ ν] ′ λ′ ′ (m + δm )a = e (δ ν + u uν) 3a˙ + 3R λu + 2e uν ∇ G +λ′ (z(τ),z(τ ))u dτ , (478 ) −∞