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$\mathrm{G}_2$-instantons on the 7-sphere

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arxiv 2002.02386 v3 pith:TDMUUPDC submitted 2020-02-06 math.DG

classification math.DG
keywords instantonsmathrmspheredeformationsinstantonspacecompletecopies
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abstract

We study the deformation theory of $\mathrm{G}_2$-instantons on the 7-sphere, specifically those obtained from instantons on the 4-sphere via the quaternionic Hopf fibration. We find that the pullback of the standard ASD instanton lies in a smooth, complete, 15-dimensional family of $\mathrm{G}_2$-instantons. In general, the space of infinitesimal $\mathrm{G}_2$-instanton deformations on $S^7$ is identified with three copies of the space of ASD deformations on $S^4.$

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