New exact solution of Einstein's equations for the gravitational field of a stationary axisymmetric mass
Man'ko V. S. , Khakimov Sh. A.
An exact, asymptotically planar solution of the vacuum Einstein's equations is derived to describe the external gravitational field of a rotating axisymmetric mass. This solution has a static Schwarzschild limit. It contains the Kerr metric as a special case.