The cactus flower moduli-space homeomorphism conjecture

Let D˘n\breve D_n be the cube complex whose cubes are indexed by [n][n]-labelled cyclic forests, and let Mn+2σ(R)\overline M_{n+2}^\sigma(\mathbb{R}) be the indicated real locus of the moduli space Mn+2\overline M_{n+2}. Its geometric strata are indexed by the same cyclic forests, with codimension equal to the number of internal edges. Cactus flower homeomorphism conjecture. There is a homeomorphism

D˘nMn+2σ(R)\breve D_n \cong \overline M_{n+2}^\sigma(\mathbb{R})

such that the cube complex and the geometric stratification are dual complexes. The conjecture identifies the combinatorial compactification encoded by D˘n\breve D_n with the real moduli space and its stratification; the supplied text gives no resolution status.

Sources & referencesView supporting material

Primary source

Aleksei Ilin, Joel Kamnitzer, Yu Li, Piotr Przytycki and Leonid Rybnikov, “The moduli space of cactus flower curves and the virtual cactus group”, arXiv:2308.06880 (2024).

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