Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Massive photon propagator in the presence of axionic fluctuations   The theory of massive photons in the presence of axions is studied as the
effective theory describing the electromagnetic response of semimetals when a
particular quartic fermionic pairing perturbation triggers the formation of
charged chiral condensates, giving rise to an axionic superconductor. We
investigate corrections to the Yukawa-like potential mediated by massive
photons due to axion excitations up to one-loop order and compute the
modifications of the London penetration length.

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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph