Classification of Kerr-de Sitter-like spacetimes with conformally flat $\mathcal{I}$ in all dimensions

Abstract

Using asymptotic characterization results of spacetimes at conformal infinity, we prove that Kerr-Schild-de Sitter spacetimes are in one-to-one correspondence with spacetimes in the Kerr-de Sitter-like class with conformally flat $\mathcal{I}$. Kerr-Schild-de Sitter are spacetimes of Kerr-Schild form with de Sitter background that solve the $(\Lambda >0)$-vacuum Einstein equations and admit a smooth conformal compactification sharing $\mathcal{I}$ with the background metric. Kerr-de Sitter-like metrics with conformally flat $\mathcal{I}$ are a generalization of the Kerr-de Sitter metrics, defined originally in four spacetime dimensions and extended here to all dimensions in terms of their initial data at null infinity. We explicitly construct all metrics in this class as limits or analytic extensions of Kerr-de Sitter. The structure of limits is inferred from corresponding limits of the asymptotic data, which appear to be hard to guess from the spacetime metrics.

arXiv comment46 pages, 1 figure

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• Covariant classification of conformal Killing vectors of locally conformally flat $n$-manifolds with an application to Kerr-de Sitter
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• On the uniqueness of the Kerr-(A)dS metric as a type II(D) solution in six dimensions
• On type II(D) Einstein spacetimes in six dimensions