Fermi-Walker gauge in 2+1 dimensional gravity.

Details Fermi-Walker gauge in 2+1 dimensional gravity. Fermi-Walker gauge in 2+1 dimensional gravity.

1995-01-13

arxiv.org/abs/gr-qc/9501013v1

Class.Quant.Grav.12:2309-2326,1995

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

28 pages, RevTex, no figures

Scientific paper

10.1088/0264-9381/12/9/017

It is shown that the Fermi-Walker gauge allows the general solution of determining the metric given the sources, in terms of simple quadratures. We treat the general stationary problem providing explicit solving formulas for the metric and explicit support conditions for the energy momentum tensor. The same type of solution is obtained for the time dependent problem with circular symmetry. In both cases the solutions are classified in terms of the invariants of the Wilson loops outside the sources. The Fermi-Walker gauge, due to its physical nature, allows to exploit the weak energy condition and in this connection it is proved that, both for open and closed universes with rotational invariance, the energy condition imply the total absence of closed time like curves. The extension of this theorem to the general stationary problem, in absence of rotational symmetry is considered. At present such extension is subject to some assumptions on the behavior of the determinant of the dreibein in this gauge. PACS number: 0420

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