Fujita decomposition and Massey product for fibered varieties

Fujita decomposition and Massey product for fibered varieties
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纤维品种的藤田分解和梅西积

DOI:
10.1017/nmj.2021.15
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发表时间:
2021
影响因子:
0.8
通讯作者:
F. Zucconi
F. Zucconi
中科院分区:
数学2区
文献类型:
--
作者:
L. Rizzi;F. Zucconi

文献摘要

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设是一个半稳定纤维化,其中X是维数的光滑簇,B是光滑曲线。给出了相对-形式和相对顶形式的局部系的结构定理。这给出了一个整洁的解释的第二藤田分解。我们应用我们的解释,以显示存在的基础上的变化,更高的非理性铅笔和相关的monodromy表示的有限性自然Castelnuovo型假设下的局部子系统。最后,我们给出了X不是Albanese一般类型的一个判据,如果。
Let be a semistable fibration where X is a smooth variety of dimension and B is a smooth curve. We give the structure theorem for the local system of the relative -forms and of the relative top forms. This gives a neat interpretation of the second Fujita decomposition of . We apply our interpretation to show the existence, up to base change, of higher irrational pencils and on the finiteness of the associated monodromy representations under natural Castelnuovo-type hypothesis on local subsystems. Finally, we give a criterion to have that X is not of Albanese general type if .