Equation Icon  ˙δ = − v ∇ δ − (1 + δ )∇ ⋅ v (1.6.11 ) m m m m m ˙vm = − (2H¯ − β ˙¯ϕ)vm − (vm ∇ )vm −2 − a ∇ (Φ − βδϕ ) (1.6.12 ) Δ δϕ = − βa2 δρm (1.6.13 ) a2∑ Δ Φ = − --- δρα (1.6.14 ) 2 α