Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vacuum Nucleon Loops and Naturalness   Phenomenological studies support the applicability of naturalness and naive
dimensional analysis to hadronic effective lagrangians for nuclei. However,
one-baryon-loop vacuum contributions in renormalizable models give rise to
unnatural coefficients, which indicates that the quantum vacuum is not
described adequately. The effective lagrangian framework accommodates a more
general characterization of vacuum contributions without reference to a Dirac
sea of nucleons.

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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
16
The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
9
The categories of this paper are: nlin
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The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys