Equation Icon  ∫ ( ) ¯ |d-ϕ|2-+-|dψ-|2- |dN-|2 +-|dY--−-2ϕd-ψ-+-2ψd-ϕ|2 Seff = ¯∗ R − 2 N − 2 N 2 , (25 )