Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measuring Vacuum Polarization with Josephson Junctions   We argue that the vacuum polarization by the virtual electron-positron pairs
can be measured by studying a Josephson junction in a strong magnetic field.
The vacuum polarization results in a weak dependence of the Josephson constant
on the magnetic field strength which is within the reach of the existing
experimental techniques.

24
The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph