Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Remarks on a five-dimensional Kaluza-Klein theory of the massive Dirac
  monopole   The Gross-Perry-Sorkin spacetime, formed by the Euclidean Taub-NUT space with
the time trivially added, is the appropriate background of the Dirac magnetic
monopole without an explicit mass term. One remarks that there exists a very
simple five-dimensional metric of spacetimes carrying massive magnetic
monopoles that is an exact solution of the vacuum Einstein equations. Moreover,
the same isometry properties as the original Euclidean Taub-NUT space are
preserved. This leads to an Abelian Kaluza-Klein theory whose metric appears as
a combinations between the Gross-Perry-Sorkin and Schwarzschild ones. The
asymptotic motion of the scalar charged test particles is discussed, now by
accounting for the mixing between the gravitational and magnetic effects.

2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th