Metric-affine gravity and the Nester-Witten 2-form

Details Metric-affine gravity and the Nester-Witten 2-form Metric-affine gravity and the Nester-Witten 2-form

2000-06-09

arxiv.org/abs/gr-qc/0006032v2

J.Geom.Phys. 39 (2001) 265-275

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LaTeX (14 pages, 3 runs); added references, corrected typos, clarified content of section 3

Scientific paper

10.1016/S0393-0440(01)00007-9

In this paper we redefine the well-known metric-affine Hilbert Lagrangian in terms of a spin-connection and a spin-tetrad. On applying the Poincar\'e-Cartan method and using the geometry of gauge-natural bundles, a global gravitational superpotential is derived. On specializing to the case of the Kosmann lift, we recover the result originally found by Kijowski (1978) for the metric (natural) Hilbert Lagrangian. On choosing a different, suitable lift, we can also recover the Nester-Witten 2-form, which plays an important role in the energy positivity proof and in many quasi-local definitions of mass.

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