Expanding tensors in warped spaces

[Geová Maciel de Alencar Filho]

Hi, I am trying to expand tensors in warped spaces. I have taken the example of Leo Stein, but it works only for geometric tensors, such as the Ricci tensor. I computed the energy-momentum tensor for the Maxwell field and tried the same, but does not work. My questions are in the notebook. Any help would be welcome