Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Balancing a static black ring with a phantom scalar field   All known five dimensional, asymptotically flat, static black rings possess
conical singularities. However, there is no fundamental obstruction forbidding
the existence of balanced configurations, and we show that the
Einstein--Klein-Gordon equations admit (numerical) solutions describing static
asymptotically flat black rings, which are regular on and outside the event
horizon. The scalar field is 'phantom', which creates the self-repulsion
necessary to balance the black rings. Similar solutions are likely to exist in
other spacetime dimensions, the basic properties of a line element describing a
four dimensional, asymptotically flat black ring geometry being discussed.

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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: cond-mat
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The categories of this paper are: math