Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ricci-flat spacetimes with l-conformal Galilei symmetry   Ricci-flat metrics of the ultrahyperbolic signature which enjoy the
l-conformal Galilei symmetry are constructed. They involve the AdS_2-metric in
a way similar to the near horizon black hole geometries. The associated
geodesic equations are shown to describe a second order dynamical system for
which the acceleration generators are functionally independent.

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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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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: hep-lat
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The categories of this paper are: astro-ph
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th