Equation Icon  ∫ ( ) ¯ |d-ϕ|2 +-|dψ-|2 |dN-|2 +-|dY--−-2ϕd-ψ-+-2ψd-ϕ|2- Seff = ¯∗ R − 2 N − 2N 2 , (6.20 )