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Cartan Rediscovered in General Relativity

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Salisbury,  Donald C.
Department Structural Changes in Systems of Knowledge, Max Planck Institute for the History of Science, Max Planck Society;

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Renn,  Jürgen       
Department Structural Changes in Systems of Knowledge, Max Planck Institute for the History of Science, Max Planck Society;

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Sundermeyer,  Kurt
Department Structural Changes in Systems of Knowledge, Max Planck Institute for the History of Science, Max Planck Society;

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Citation

Salisbury, D. C., Renn, J., & Sundermeyer, K. (2022). Cartan Rediscovered in General Relativity. General Relativity and Gravitation, 54(10, Article 116): 116. doi:10.1007/s10714-022-03003-5.


Cite as: https://hdl.handle.net/21.11116/0000-000B-3B3A-3
Abstract
Élie Cartan’s invariant integral formalism is extended to gauge field theory, including general relativity. This constitutes an alternative procedure, as shown in several examples, that is equivalent when no second class constraints are present to the Rosenfeld, Bergmann, Dirac algorithm. In addition, a Hamilton–Jacobi formalism is developed for constructing explicit phase space functions in general relativity that are invariant under the full four-dimensional diffeomorphism group. These identify equivalence classes of classical solutions of Einstein’s equations. Each member is dependent on intrinsic spatial coordinates and also undergoes non-trivial evolution in intrinsic time. Furthermore, the construction yields series expansion solutions of the field equations for all of the components of the metric tensor, including lapse and shift, in the intrinsic temporal and spatial coordinates. The intrinsic coordinates are determined by the spacetime geometry in terms of Weyl scalars. The implications of this analysis for an eventual quantum theory of gravity are profound.