Projective-flatness conjecture for vector bundles of radial Kupka components

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Let MM be an algebraic manifold with dim⁡CM≥3\dim_{\mathbb{C}}M\geq3, let LL be a very ample line bundle on MM, and let ω∈K(M,L,x dy−y dx)\omega\in K(M,L,x\,dy-y\,dx) be a foliation with normal bundle LL and a compact, connected radial Kupka component. Let VV be the associated rank-two holomorphic vector bundle, arising from an exact sequence 0⟶O⟶V⟶JK(L)⟶00\longrightarrow\mathcal{O}\longrightarrow V\longrightarrow\mathcal{J}_{K}(L)\longrightarrow0. Projective-flatness conjecture. The vector bundle VV is projectively flat. In the positive-line-bundle setting such a bundle exists and has total Chern class c(V)=(1+c1(L)2)2c(V)=\left(1+\frac{c_1(L)}{2}\right)^2, but it need not be semistable in general; projective flatness is posed as the remaining general-case property.

References

Primary source

Omegar Calvo-Andrade, “Foliations with a radial Kupka set on projective spaces”, arXiv:1309.3298 (2013).

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