Fermi-Walker coordinates in 2+1 dimensional gravity

Details Fermi-Walker coordinates in 2+1 dimensional gravity Fermi-Walker coordinates in 2+1 dimensional gravity

1994-10-03

arxiv.org/abs/gr-qc/9410001v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Talk presented at Seventh Marcel Grossmann Meeting on General Relativity, July 24-29, REVTEX, 5 pages, MIT-CTP\#2362 IFUP-TH 5

Scientific paper

It is shown that in 2+1 dimensions the Fermi-Walker gauge allows the general solution of the problem of determining the metric from the sources in terms of simple quadratures. This technique is used to solve the problem of the occurrence of closed time like curves (CTC's) in stationary solutions. In fact 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 axial symmetry, 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 axial symmetry is considered and at present the proof of such generalization is subject to some assumptions on the behavior of the determinant of the dreibeins in this gauge.

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