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\(L^2\) Castelnuovo-de Franchis, the cup product lemma, and filtered ends of Kähler manifolds. (English) Zbl 1173.32010

New approaches to the proof of the \(L^2\) Castelnuovo-de Franchis theorem and to the cup product lemma are developed. In particular a version of the \(L^2\) Castelnuovo-de Franchis theorem is obtained in which only one of the holomorphic 1-forms needs to be in \(L^2\) for \((X,g)\) being a connected complete Kähler manifold with bounded geometry. For the cup product lemma it is assumed that only one of the forms belongs to \(L^{\infty}\) instead of in \(L^2\) and the other form does not need to have exact real part. These results allow to prove the existence of a surjective proper holomorphic mapping onto a Riemann surface \(\phi:X \to S\), where \(X\) denotes a connected complete Kähler manifold with bounded geometry. Further generalizations are also treated so as applications to filtered ends of Kähler manifolds.

MSC:

32Q15 Kähler manifolds

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