Abstract
Riemannian space-times with self-dual curvature and which admit at least one Killing vector field (stationary) are examined. Such space-times can be classified according to whether a certain scalar fieldψ (which is the difference between the Newtonian and NUT potentials) reduces to a constant or not. In the former category (called here KSD) are the multi-TaubNUT and multi-instanton space-times. Nontrivial examples of the latter category have yet to be discovered. It is proved here that the static self-dual metrics are flat. It is also proved that each stationary metric for which the Newtonian and nut potentials are functionally related admits a Killing vector field relative to which the metric is KSD. It has also been proved that the regularity of theψ field everywhere implies that the metric is KSD. Finally it is proved that for non-KSD space-times every regular compact level surface of theψ field encloses the total NUT charge, which must be proportional to the Euler number of the surface.
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The research reported here was done while the author was an NSERC Postdoctoral Fellow at Simon Fraser University.
The author is also a member of the Theoretical Science Institute at Simon Fraser University, and preparation for publication was partially assisted NSERC Research Grant No. 3993.
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Gegenberg, J.D., Das, A. Stationary Riemannian space-times with self-dual curvature. Gen Relat Gravit 16, 817–829 (1984). https://doi.org/10.1007/BF00762935
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DOI: https://doi.org/10.1007/BF00762935