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Exotic holonomies $\E_7^{(a)}$

Q. -S. Chi·S. A. Merkulov·L. J. Schwachhöfer
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Abstract

It is proved that the Lie groups $\E_7^{(5)}$ and $\E^{(7)}_7$ represented in $\R^{56}$ and the Lie group $\E_7^{\C}$ represented in $\R^{112}$ occur as holonomies of torsion-free affine connections. It is also shown that the moduli spaces of torsion-free affine connnections with these holonomies are finite dimensional, and that every such connection has a local symmetry group of positive dimension.

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Q. -S. Chi, S. A. Merkulov, L. J. Schwachhöfer. 1996-07-18. Exotic holonomies $\E_7^{(a)}$. https://arxiv.org/abs/dg-ga/9607004

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