Equation Icon  ˙ρ + Θ(ρ + p) = 0, (259 ) c2s⃗∇ μ + (ρ + p)Aμ = 0, (260 ) 4 ˙ρℰ + -Θ ρℰ + ⃗∇ μqℰμ = 0, (261 ) 3 ℰ ℰ 1-⃗ 4- ⃗ ν ℰ (ρ-+-p)⃗ q˙μ + 4Hq μ + 3 ∇ μρℰ + 3ρ ℰAμ + ∇ πμν = − λ ∇ μρ. (262 )