Equation Icon  [ 2( ) ( )] ℰ μν = ---2--- − κ-- T μ+ e−2dTμ − ∇ μ∇ νd + δμ∇2d − ∇ μd∇ νd + 1-δμ(∇d )2 , (402 ) e2d − 1 2 ν − ν ν 2 ν