The direct image of the relative dualizing sheaf needs not be semiample |
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Authors: | Fabrizio Catanese Michael Dettweiler |
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Institution: | Mathematisches Institut, Universität Bayreuth, 95447 Bayreuth, Germany |
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Abstract: | We provide details for the proof of Fujita's second theorem and prove that for a Kähler fibre space f:X→B over a smooth projective curve B , the direct image of the relative dualizing sheaf V:=f?ωX/B is the direct sum of an ample and a unitary flat bundle. We also show that V needs not be semiample, which is our main result. |
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