Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discrete O(1,4) transformations and new scalar quantum modes on the de
  Sitter spacetime   It is shown that the isometry group of the de Sitter spacetime includes two
different three-dimensional Abelian subgroups which transform between
themselves through a discrete isometry corresponding to the time reversal in
the five-dimensional Minkowski spacetime embedding the de Sitter one. The
eigenfunctions of the generators of these Abelian subgroups form two different
sets of quantum modes correlated by the mentioned isometry.

26
The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex