Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A novel derivation for Kerr metric in Papapetrou gauge   We present a simple novel derivation, ab initio, of the equations appropriate
for stationary axisymmetric spacetimes using the Papapetrou form of the metric
(Papapetrou gauge). It is shown that using coordinates which preserve the
Papapetrou gauge three separated solutions of the Ernst equations appear in the
case of Kerr metric. In this context a parameter arises which represents
topological defects induced by an infinite static string along the z axis.
Finally, we discuss a simple solution that may be derived from the Kerr ansatz.

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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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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: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex