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gr-qc1997
Conformal relations and Hamiltonian formulation of fourth-order gravity
H. -J. Schmidt
The conformal equivalence of fourth-order gravity following from a non-linear Lagrangian L(R) to theories of other types is widely known, here we report on a new conformal equivale…
gr-qc1997
A new proof of Birkhoff's theorem
H. -J. Schmidt
Assuming SO(3)-spherical symmetry, the 4-dimensional Einstein equation reduces to an equation conformally related to the field equation for 2-dimensional gravity following from the…