Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomaly Nucleation Constrains SU(2) Gauge Theories   We argue for the existence of additional constraints on SU(2) gauge theories
in four dimensions when realized in ultraviolet completions admitting an analog
of D-brane nucleation. In type II string compactifications these constraints
are necessary and sufficient for the absence of cubic non-abelian anomalies in
certain nucleated SU(N>2) theories. It is argued that they appear quite broadly
in the string landscape. Implications for particle physics are discussed; most
realizations of the standard model in this context are inconsistent, unless
extra electroweak fermions are added.

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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: alg-geom