The SU(3)-invariant quadratic-exponential expander-family conjecture

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Let Λ−2CP2\Lambda^2_-\mathbb{CP}^2 denote the anti-self-dual bundle of the complex projective plane. A complete expander has quadratic-exponential volume growth when its volume grows at the quadratic-exponential rate described by the corresponding end model. SU(3)-invariant quadratic-exponential family conjecture. There exists a 11-parameter family of complete SU(3)\textup{SU}(3)-invariant expanders defined on Λ−2CP2\Lambda^2_-\mathbb{CP}^2, all with quadratic-exponential volume growth. The conjecture describes the expected transition family between AC and forward-incomplete smoothly-closing expanders; it remains open.

References

Primary source

Mark Haskins, Rowan Juneman and Johannes Nordström, “Sp(2)-invariant expanders and shrinkers in Laplacian flow”, arXiv:2501.05437 (2025).

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