Abstract
A first-order Lagrangian is given, from which follow the definitions of the fully covariant form of the Riemann tensorR μνkλ in terms of the affine connection and metric; the definition of the affine connection in terms of the metric; the Einstein field equations; and the definition of a set of gravitational “superpotentials” closely connected with the Komar conservation laws [7]. Substitution of the definition of the affine connection into this Lagrangian results in a second-order Lagrangian, from which follow the definition of the fully covariant Riemann tensor in terms of the metric, the Einstein equations, and the definition of the gravitational “superpotentials”.
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Dedicated to Achille Papapetrou on the occasion of his retirement.
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Stachel, J. A variational principle giving gravitational “superpotentials,” the affine connection, Riemann tensor, and Einstein field equations. Gen Relat Gravit 8, 705–712 (1977). https://doi.org/10.1007/BF00756324
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DOI: https://doi.org/10.1007/BF00756324