Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Opposite charged two-body system of identical counter-rotating black
  holes   A 4-parametric exact solution describing a two-body system of identical
Kerr-Newman counter-rotating black holes endowed with opposite
electric/magnetic charges is presented. The axis conditions are solved in order
to really describe two black holes separated by a massless strut. Moreover, the
explicit form of the horizon half length parameter sigma in terms of physical
Komar parameters, i.e., the Komar mass M, electric charge QE, angular momentum
J, and a coordinate distance R is derived. Additionally, magnetic charges QB
arise from the rotation of electrically charged black holes. As a consequence,
in order to account for the contribution to the mass of the magnetic charge,
the usual Smarr mass formula should be generalized, as it is proposed by A.
Tomimatsu, Prog. Theor. Phys. 72, 73 (1984).

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The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex