Equation Icon  ∂ a = − -a-(a2 − 1) + 4π Gra2 τ (35 ) r 2r α-( 2 ) 2 r ∂rα = 2r a − 1 + 4π Gr αa S r (36 ) [ ] Φ ( ω2 dV ) ∂rΦ = − 1 + a2 + 4π Gr2a2 (Srr − τ) --− --2 − ----2 a2ϕ0 . (37 ) r α d|ϕ|