Conditions for Regularity on the Symmetry Axis in a Superposition of Two Kerr-NUT Solutions

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Abstract
A property of the symmetry axis of the metric describing a superposition of two Kerr-NUT solutions is examined. We give some conditions to the parameters included in the metric, in order to assure that the two constituent masses are dynamically balanced by the rotational repulsion against the gravitational attraction, and the total mass becomes positive. It is shown that a suitable choice of the two NUT terms of the constituent solutions is especially important.

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