Equatorial symmetry/antisymmetry of stationary axisymmetric electrovac spacetimes

Two theorems are proved concerning how stationary axisymmetric electrovac spacetimes that are equatorially symmetric or equatorially antisymmetric can be characterized correctly in terms of the Ernst potentials \E and $\Phi$ or in terms of axis-data.Comment: 8 page

General-relativistic Model of Magnetically Driven Jet

The general scheme for the construction of the general-relativistic model of the magnetically driven jet is suggested. The method is based on the usage of the 3+1 MHD formalism. It is shown that the critical points of the flow and the explicit radial behavior of the physical variables may be derived through the jet ``profile function."Comment: 12 pages, LaTex, no figure

Generalization of the Kerr-Newman solution

An exact four-parameter solution of the Einstein-Maxwell equations is derived. This solution constitutes a generalization of the Kerr-Newman metric. It incorporates a quadrupole deformation of a rotating charged mass. © 1992 Plenum Publishing Corporation

Exterior gravitational field of a charged magnetised axisymmetric mass

We present an exact stationary asymptotically flat solution of the Einstein-Maxwell equations that may describe the exterior gravitational field of an arbitrary-axisymmetric-mass distribution endowed with electric-charge and magnetic-dipole moment. The full metric for the solution obtained is constructed in explicit form. © 1993 Società Italiana di Fisica