Special varieties package conjecture for local-system moduli

Let XX be a smooth complex algebraic variety and rr a natural number. Let MB(X,r)\mathcal{M}_B(X,r) be the moduli space of semisimple complex local systems of rank rr. An absolute Q\overline{\mathbb{Q}}-point means a point satisfying the paper's absolute arithmetic conditions, and geometric origin is understood in the sense used for local systems. Special varieties package conjecture. (1) The absolute Q\overline{\mathbb{Q}}-constructible subsets of MB(X,r)(C)\mathcal{M}_B(X,r)(\mathbb{C}) are generated from the absolute Q\overline{\mathbb{Q}}-closed subsets by taking irreducible components, intersections, finite unions, and complements; in particular, the Euclidean, equivalently Zariski, closure of an absolute Q\overline{\mathbb{Q}}-constructible set is absolute Q\overline{\mathbb{Q}}-closed. (2) An absolute Q\overline{\mathbb{Q}}-closed set is the Zariski closure of its absolute Q\overline{\mathbb{Q}}-points. (3) A point is an absolute Q\overline{\mathbb{Q}}-point if and only if it is of geometric origin. (4) An irreducible component of the Zariski closure of an infinite set of absolute Q\overline{\mathbb{Q}}-points is an absolute Q\overline{\mathbb{Q}}-closed subset in MB(X,r)(C)\mathcal{M}_B(X',r')(\mathbb{C}) for possibly a different smooth complex algebraic variety XX' and natural number rr', where MB(X,r)\mathcal{M}_B(X',r') is isomorphic to MB(X,r)\mathcal{M}_B(X,r) over Q\mathbb{Q}. The package is presented as a conjectural analogue of the Manin–Mumford, Mordell–Lang, and André–Oort principles; the final part is explicitly motivated only by analogy and the assertions remain open.

Sources & referencesView supporting material

Primary source

Nero Budur and Botong Wang, “Absolute sets and the Decomposition Theorem”, arXiv:1702.06267 (2021).

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