Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some comments on 6d global gauge anomalies   Global gauge anomalies in $6d$ associated with non-trivial homotopy groups
$\pi_6(G)$ for $G=SU(2)$, $SU(3)$, and $G_2$ were computed and utilized in the
past. In the modern bordism point of view of anomalies, however, they come from
the bordism groups $\Omega^\text{spin}_7(BG)$, which are in fact trivial and
therefore preclude their existence. Instead, it was noticed that a proper
treatment of the $6d$ Green-Schwarz mechanism reproduces the same anomaly
cancellation conditions derived from $\pi_6(G)$. In this paper, we revisit and
clarify the relation between these two different approaches.

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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ph
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The categories of this paper are: math