Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fermionic Casimir effect in an external magnetic field   The influence of an external constant uniform magnetic field on the Casimir
energy density of a Dirac field under antiperiodic (and periodic) boundary
condition is computed by applying Schwinger's proper time method. The result
thus obtained shows that in principle, under suitable conditions, the magnetic
field can enhance the fermionic Casimir energy density.

9
The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys