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arxiv: 2409.04362 · v1 · submitted 2024-09-06 · 🧮 math.DG · math.AT

Compact holonomy G₂ manifolds need not be formal

classification 🧮 math.DG math.AT
keywords compactmathrmholonomymanifoldsarrangingconfigurationconnectedconstruct
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We construct a compact, simply connected manifold with holonomy $\mathrm{G}_2$ that is non-formal. We use the construction method of compact torsion-free $\mathrm{G}_2$ manifolds developed by D.D. Joyce and S. Karigiannis. A non-vanishing triple Massey product is obtained by arranging the singular locus in a particular configuration.

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