Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Geometric Magnetic Flux and Crossed Modules   It is shown that the BRST operator of twisted N=4 Yang-Mills theory in four
dimensions is locally the same as the BRST operator of a fully decomposed
non-Abelian gerbe. Using locally defined Yang-Mills theories we describe
non-perturbative backgrounds that carry a novel magnetic flux. Given by
elements of the crossed module G x Aut G, these non-geometric fluxes can be
classified in terms of the cohomology class of the underlying non-Abelian
gerbe, and generalise the centre ZG valued magnetic flux found by 't Hooft.
These results shed light also on the description of non-local dynamics of the
chiral five-brane in terms of non-Abelian gerbes.

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The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
1
The categories of this paper are: cs
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The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas