Trilinear generally covariant equations of AP

Details Trilinear generally covariant equations of AP Trilinear generally covariant equations of AP

2002-03-04

arxiv.org/abs/gr-qc/0203008v2

Sov.Phys.J. 34 (1991) 105-110

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, Latex. Corrected typos (e.g., in Eqs.(5), (26))

Scientific paper

Field equations for n-frames h_a{}^\mu that are possible in the theory of absolute parallelism (AP) are considered. The methods of compatibility (or formal integrability) theory enable us to find the non-Lagrangian equation having unusual kind of compatibility conditions, guaranteed by two (not one) identities. This 'unique equation' was not noted explicitly in the classification by Einstein and Mayer of compatible second order equations of AP. It is shown that some equations of AP (including 'unique equation') can be written in a trilinear form that contains only the matrix of frame density (of some weight) H_a{}^\mu and its derivatives and not inverse (coframe density) matrix. The equations are still regular and involutive for degenerate but finite matrices H_a{}^\mu if rank H_a{}^\mu > 1.

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