Kerr-Schild Tetrads and the Nijenhuis Tensor

J. W. Maluf, F. L. Carneiro, S. C. Ulhoa +1

We write the Kerr-Schild tetrads in terms of the flat space-time tetrads and of a (1,1) tensor $S_{\mu }^{\lambda }$. This tensor can be considered as a projection operator, since it transforms…