Talk:Projective vector field
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Need to define projectives on any manifold first then specialise to spacetimes. ---Mpatel (talk) 13:12, August 28, 2005 (UTC)
Well, you need something that fixes the geodesic structure, so generalization to (semi) Riemannian manifolds is straight forward, done. [melli]146.186.134.176 (talk) 00:42, 15 February 2008 (UTC)
Given a vector field X = (Xa) on a semi Riemannian manifold, what is Xab? Is it related to your hab or Fab? if it were just Xa;b then ψ would be 0, right? [melli] 146.186.134.176 (talk) 00:33, 15 February 2008 (UTC)
I hope the dimensional estimates for the algebras (which are clearly local) do not depend on the signature of the metric. [melli]146.186.134.176 (talk) 01:06, 15 February 2008 (UTC)
