AI 中文总结
本文给出纤维丛成为伴随纤维丛的判别准则,证明满足特定条件的满射纤维丛均为伴随纤维丛,进而推出丰反典范除子代数簇的弱博韦尔-博戈莫洛夫分解。
AI 中文摘要
我们给出纤维丛成为伴随纤维丛的一个判别准则。作为应用,在合适的奇点与Cartier指数假设下,任意具有丰反典范除子的满射纤维丛X→Y都是伴随纤维丛,由此还可推出丰反典范除子的代数簇的弱博韦尔-博戈莫洛夫分解。
英文摘要
We give a criterion for a fibration to be an associated fibre bundle. As an application, we show that, under suitable singularity and Cartier-index assumptions, any surjective fibration $X \rightarrow Y$ with nef $-K_{X/Y}$ is an associated fibre bundle. From this, we also deduce a weak Beauville--Bogomolov decomposition for varieties with nef anticanonical divisor.
Comments23 pages. Comments welcome!