Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1999-10-08
Nucl.Phys.Proc.Suppl. 88 (2000) 365-368
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
6 pages, Revtex. Talk given at the Conference "Constrained Dynamics and Quantum Gravity, QG99", Villasimius (Sardinia, Italy),
Scientific paper
10.1016/S0920-5632(00)00803-3
The construction of conformally invariant gauge conditions for Maxwell and Einstein theories on a manifold M is found to involve two basic ingredients. First, covariant derivatives of a linear gauge (e.g. Lorenz or de Donder), completely contracted with the tensor field representing the metric on the vector bundle of the theory. Second, the addition of a compensating term, obtained by covariant differentiation of a suitable tensor field built from the geometric data of the problem. If the manifold M is endowed with an m-dimensional positive-definite metric g, the existence theorem for such a gauge in gravitational theory can be proved. If the metric g is Lorentzian, which corresponds to general relativity, some technical steps are harder, but one has again to solve integral equations on curved space-time to be able to impose such gauges.
Esposito Giampiero
Stornaiolo Cosimo
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