Abstract
Abstract In this study, beginning with the 4D asymptotically flat Kerr black hole solution in the Boyer–Lindquist (BL) coordinate system, then by using the technique of frame-dragging and some coordinate transformation to incorporate the linear-order supertranslation correction, we finally obtain a 4D asymptotically flat black hole solution with an arbitrary a in the linear-order supertranslated BL coordinate system. We can confirm that this satisfies the Einstein equation. At the end, we calculate the angular momentum of the spacetime we obtained in this study including the linear-order correction. Since the supertranslation is a type of general coordinate transformation, which is usually defined by linear order, the corrections we incorporate in this study is sufficient, considering the fact that a is arbitrary. This work would be interesting as a generalization of the supertranslated spacetime to the rotating system.
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