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Prog. Theor. Phys. Vol. 98 No. 6 (1997) pp. 1355-1370

[ Full Text PDF : FREE ACCESS (780K) ]

Energy and Momentum in the Tetrad Theory of Gravitation

Takeshi Shirafuji and Gamal G. L. Nashed

Physics Department, Saitama University, Urawa 338

(Received June 27, 1997)

Abstract:

We study the energy and momentum of an isolated system in the tetrad theory of gravitation, starting from the most general Lagrangian quadratic in torsion, which involves four unknown parameters. When applied to the static spherically symmetric case, the parallel vector fields take a diagonal form, and the field equation has an exact solution. We analyze the linearized field equation in vacuum at distances far from the isolated system without assuming any symmetry property of the system. The linearized equation is a set of coupled equations for a symmetric and skew-symmetric tensor fields, but it is possible to solve it up to O(1/r) for the stationary case. It is found that the general solution contains two constants, one being the gravitational mass of the source and the other a constant vector \graveBα. The total energy is calculated from this solution and is found to be equal to the gravitational mass of the source. We also calculate the spatial momentum and find that its value coincides with the constant vector \graveBα. The linearized field equation in vacuum, which is valid at distances far from the source, does not give any information about whether the constant vector \graveBα is vanishing or not. For a weakly gravitating source for which the field is weak everywhere, we find that the constant vector \graveBα vanishes.


URL : http://ptp.ipap.jp/link?PTP/98/1355/
DOI : 10.1143/PTP.98.1355

[ Full Text PDF : FREE ACCESS (780K) ] Citation:

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Citing Article(s) :

  1. Progress of Theoretical Physics Vol. 108 No. 4 (2002) pp. 615-639 :
    Energy-Momentum and Angular Momentum Carried by Gravitational Waves in Extended New General Relativity
    Eisaku Sakane and Toshiharu Kawai

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