Ramachandran's Bochner–Hartogs or surface-group dichotomy

From papers

Let XX be a smooth projective variety with a type B Zariski-dense representation ρ:π1(X)G\rho:\pi_{1}(X)\longrightarrow G to a Lie group GG defined over a local field KK, and set H=ker(ρ)H=\ker(\rho). Assume that HH is finite. The Bochner–Hartogs property for X~\widetilde{X} means that for every compactly supported (0,1)(0,1)-form αAc0,1(X~)\alpha\in A^{0,1}_{c}(\widetilde{X}) with ˉα=0\bar\partial\alpha=0, there is a compactly supported smooth function uCc(X~)u\in C^{\infty}_{c}(\widetilde{X}) such that ˉu=α\bar\partial u=\alpha.

Ramachandran's conjecture. One of the following holds: the universal cover X~\widetilde{X} has the Bochner–Hartogs property, or π1(X)\pi_{1}(X) is commensurable with the fundamental group of a compact Riemann surface.

The paper attributes this question to M. Ramachandran and presents it as a possible application of the Shafarevich–Kollár conjecture. The supplied text gives no resolution status.

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Sources & referencesView supporting material

Primary source

Ludmil Katzarkov, “Factorization theorems for the representations of the fundamental groups of quasiprojective varieties and some applications”, arXiv:alg-geom/9402012 (1994).

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