Equation Icon  [ U ′′uβ′′ = gα′ u ′ + 2r (1 − ra Ωb) a ′ + 2r2˙a ′ + r2R ′ Ωb αβ α α b α α α 0b0 1 ( ) ] + --r2 R00 − 2R0aΩa + RabΩa Ωb u α′ + 𝒪 (r3) , (465 ) 12