Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A CR twistor space of a G2-manifold   Let M be a G2-manifold. We consider an almost CR-structure on the sphere
bundle of unit tangent vectors on M, called the CR twistor space. This
CR-structure is integrable if and only if M is a holonomy G2 manifold. We
interpret G2-instanton bundles as CR-holomorphic bundles on its twistor space.

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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-th
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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: nucl-ex
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
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The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
30
The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an