Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the conformal structure of the extremal Reissner-Nordstr\"om
  spacetime   We analyse various conformal properties of the extremal Reissner-Nordstr\"om
spacetime. In particular, we obtain conformal representations of the
neighbourhoods of spatial infinity, timelike infinity and the cylindrical end
---the so-called cylinders at spatial infinity and at the horizon,
respectively--- which are regular with respect to the conformal Einstein field
equations and their associated initial data sets. We discuss possible
implications of these constructions for the propagation of test fields and
non-linear perturbations of the gravitational field close to the horizon.

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The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph