Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: From Schwarzschild to Kerr: Generating spinning Einstein-maxwell fields
  from static fields   The Kerr solution is generated from the Schwarzschild solution by a simple
combination of real global coordinate transformations and of invariance
transformations acting on the space of stationary solutions of the
Einstein-Maxwell equations. The same transformation can be used to generate a
spinning field configuration from any static axisymmetric configuration. We
illustrate this by generating from the continuous family of Voorhees--Zipoy
vacuum solutions a family of solutions endowed with mass, angular momentum,
dipole magnetic moment and quadrupole electric moment.

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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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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: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin