Abstract
We study a method to solve stationary axisymmetric vacuum Einstein equations numerically. As an illustration, the five-dimensional doubly spinning black rings that have two independent angular momenta are formulated in a way suitable for a fully nonlinear numerical method. Expanding for small second angular velocity, the formulation is solved perturbatively up to second order involving the backreaction from the second spin. The obtained solutions are regular without conical singularity, and the physical properties are discussed with the phase diagram of the reduced entropy vs the reduced angular momenta. Possible extensions of the present approach to constructing the higher-dimensional version of black ring and the ring with the cosmological constant are discussed also.
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