Equation Icon  ∘ -------- ∫ [ ] W = − 2- GM 3a0 − -1--- 3a2F (|∇ Φ |2∕a2 ) − μ (|∇ Φ |∕a0)|∇ Φ |2 d3x. (22 ) 3 4πG 2 0 0