Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitational Instantons and special geometry   The Chen-Teo gravitational instanton is an asymptotically flat, toric, Ricci
flat family of metrics on $\mathbb{C}\mathbb{P}^2\setminus S^1$, that provides
a counterexample to the classical Euclidean Black Hole Uniqueness conjecture.
In this paper we show that the Chen-Teo instanton is Hermitian and
non-K\"ahler. It follows that all known examples of gravitational instantons
are Hermitian.

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The categories of this paper are: q-alg
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The categories of this paper are: hep-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org