Quote by George Jones
[tex]n^a n^b h_{ab}=?[/tex]

[tex]n^a n^b h_{ab}=0[/tex]
Quote by George Jones
Now suppose [itex]v^a[/itex] is orthogonal to [itex]n^a[/itex].
[tex]v^a v^b h_{ab}=?[/tex]

[tex]v^a v^b h_{ab}=v^a v^b g_{ab}[/tex]
Now choose an othonormal that has [itex]n^a[/itex] as one element. What does the matrix for [itex]h[/itex] with respect to this basis look like?