Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generating solutions via sigma-models   We review recent development of solution-generating techniques for four and
five-dimensional Einstein equations coupled to vector and scalar fields. This
includes D=4 Einstein-Maxwell-dilaton-axion theory with multiple vector fields,
D=5 Einstein-Maxwell gravity with the Chern-Simons term (minimal
five-dimensional supergravity), and some other models which attracted attention
in connection with black rings. The method is based on reduction to
three-dimensional gravity coupled sigma-models with symmetric target spaces.
Our recent results open a way to construct the general charged black rings in
five-dimensional supergravity possibly coupled to vector multiplets.

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The categories of this paper are: cs
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The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph