Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electromagnetic vacuum densities induced by a cosmic string   We investigate the influence of a generalized cosmic string in (D+1)
-dimensional spacetime on the local characteristics of the electromagnetic
vacuum. Two special cases are considered with flat and locally de Sitter
background geometries. The topological contributions in the vacuum expectation
values (VEVs) of the squared electric and magnetic fields are explicitly
separated. Depending on the number of spatial dimensions and on the planar
angle deficit induced by the cosmic string, these contributions can be either
negative or positive. In the case of the flat bulk, the VEV of the
energy-momentum tensor is evaluated as well. For the locally de Sitter bulk,
the influence of the background gravitational field essentially changes the
behavior of the vacuum densities at distances from the string larger than the
curvature radius of the spacetime.

8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an