Vanishing Theorems and Complex Structures on Non-Classical Flag Domains

Abstract

Let $D=G_{\mathbb{R}}/V$ be a non-classical flag domain with $G_{\mathbb{R}}$ simple. We prove that every compact quotient of $D$ by a torsion-free discrete subgroup has no nonzero closed positive $(1,1)$-currents. Consequently, on any such quotient, every nontrivial holomorphic line bundle has no nonzero global sections, and a line bundle is pseudo-effective if and only if it is unitary flat. The proof combines a self-contained root-theoretic criterion with averaging of currents, without a homogeneity assumption on the line bundle. The same root criterion proves the Green--Griffiths--Kerr vanishing conjecture for locally homogeneous bundles induced by nontrivial irreducible representations of $V$ and gives an alternative proof of the Griffiths--Robles--Toledo bracket-generation lemma. For products of flag domains, we describe all closed positive $(1,1)$-currents on compact quotients by descent to the classical factors. If the lattice has dense joint projection to the classical subproduct, every such current is smooth. For non-classical domains of Hermitian type, we give an explicit second invariant complex structure whose compact quotients are projective, whereas the original quotients are not in Fujiki class $\mathcal{C}$. Finally, an explicit family on $SU(2,1)/H$ shows that topologically trivial holomorphic line bundles need not be homogeneous, even when their pullbacks to all rational curves are trivial.

arXiv comment32 pages, 8 sections, 1 appendix; no figures. Comments welcome