Thank you very much again for your answers, for which I am very grateful.
I also see my question as a hypothetical one.
I think that Birkhoff's theorem would not be applicable in a flat spacetime, since R_ij = 0 by definition of flat spacetime.
Is this correct?
(I am aware that this question is...
Thank you very much for the answers
I would like to refine my questions:
Is it correct that Birkhoff's approach is based on the definition R_ij = R^k_ijk := 0?
Does Birkhoff derive the time independence of the radial component of the Schwarzschild tensor from the condition R_10 = 0, thereby...
I have a theoretical question regarding the validity of Birkhoff's theorem in flat Minkowski spacetime (noting that this is a hypothetical scenario, as mass curves spacetime).
Common derivations of Birkhoff's theorem are based on the assumption that the Ricci tensor
R_ij = R_kij^k (Einstein...