Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The limit of Kerr-de Sitter spacetime with infinite angular-momentum
  parameter $a$   We consider the limit $a\rightarrow \infty$ of the Kerr-de Sitter spacetime.
The spacetime is a Petrov type-D solution of the vacuum Einstein field
equations with a positive cosmological constant $\Lambda$, vanishing Mars-Simon
tensor and conformally flat scri. It possesses an Abelian 2-dimensional group
of symmetries whose orbits are spacelike or timelike in different regions, and
it includes, as a particular case, de Sitter spacetime. The global structure of
the solution is analyzed in detail, with particular attention to its Killing
horizons: they are foliated by non-compact marginally trapped surfaces of
finite area, and one of them `touches' the curvature singularity, which
resembles a null 2-dimensional surface. Outside the region between these
horizons there exist trapped surfaces that again are non-compact. The solution
contains, apart from $\Lambda$, a unique free parameter which can be related to
the angular momentum of the non-singular horizon in a precise way. A maximal
extension of the (axis of the) spacetime is explicitly built. We also analyze
the structure of scri, whose topology is $\mathbb{R}^3$.

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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-th