The semialgebraic universal-cover classification conjecture

From papers

Let XX be a normal, projective variety over C{\mathbb C} with universal cover X~\tilde X. A semialgebraic open subset of a projective variety means an open subset that is semialgebraic in a projective embedding. A bounded symmetric domain is a bounded symmetric domain in a complex affine space.

Semialgebraic universal-cover classification conjecture. The following are equivalent:

X~ is biholomorphic to a semialgebraic open subset of a projective variety.\tilde X \text{ is biholomorphic to a semialgebraic open subset of a projective variety.}

and

X~ is biholomorphic to D×Cm×F,\tilde X \text{ is biholomorphic to } {\mathbb D}\times {\mathbb C}^m\times F,

where D{\mathbb D} is a bounded symmetric domain, m0m\geq 0, and FF is a normal, projective, simply connected variety.

This extends the classification of varieties with quasi-projective universal cover to the broader semialgebraic setting, including compact quotients of bounded symmetric domains. The statement is presented as the proposed classification for normal projective varieties; the supplied text gives no resolution, so its status remains open.

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Sources & referencesView supporting material

Primary source

János Kollár and John Pardon, “Algebraic varieties with semialgebraic universal cover”, arXiv:1104.2309 (2011).

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