Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Electrodynamics based on a Superselection Rule   This paper analyzes, for a multi-particle system of spin-1/2 particles, the
consequences of replacing the Poincare group as fundamental symmetry group by
the de Sitter group SO(3,2). The flat-space approximation of the de Sitter
group by the Poincare group defines a superselection rule, which correlates
spin and momentum of particles. This correlation can be formulated as an
interaction between two particles, which exhibits properties of the
electromagnetic interaction.

13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: eess