Physical identification of static and axially-symmetric vacuum metric tensors |
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Authors: | N Spyrou D Papadopoulos |
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Institution: | (1) Astronomy Department, University of Thessaloniki, 540 06 Thessaloniki, Macedonia, Greece |
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Abstract: | We present a method of a possible physical identification of the static and axially symmetric Weyl-type vacuum γ and nγ metrics.
This method, in which no interior solutions of any kind are involved, is based on the comparison of the far-field forms of
the γ and nγ metrics, and of the far-field form of the metric tensor due to a bounded gravitating perfect-fluid source given
correctly to post-Newtonian accuracy. The parameters of the vacuum solutions are expressed in terms of physical parameters
of a prolate fluid source, namely total mass-energy, semiaxes and eccentricity, defined consistently to post-Newtonian accuracy.
The results, based on the otherwise arbitrary fluid source, appear physically general. Possible astrophysical candidates for
the far-field γ andnγ metrics are proposed, based on the conditions imposed on them by the identification method. The advantages and deficiencies
of the identification method are briefly discussed. |
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Keywords: | Weyl metrics perfect fluid sources far field metrics identification |
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