Frame dragging and super-energy
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We show that the vorticity appearing in stationary vacuum spacetimes is always related to the existence of a flow of super-energy on the plane orthogonal to the vorticity vector. This result, toghether with the previously established link between vorticity and super--energy in radiative (Bondi-Sachs) spacetimes strength further the case for this latter quantity as the cause of frame dragging.
12 pages Latex. To appear in Phys.Rev. D. Typos corrected
12 pages Latex. To appear in Phys.Rev. D. Typos corrected