Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Confinement and complex singularities in QED3   The standard approximations of the Dyson--Schwinger equation lead to complex
singularities of the fermion propagator. In three-dimensional QED one can show
that this phenomenon might be related to confinement: a confining potential
leads to mass-like singularities at complex momenta, and thus to the absence of
a mass singularity on the real timelike axis. The correct treatment of the
vacuum polarization is essential for the confining nature of QED3.

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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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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: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: physics
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: stat