Deformation of Singularities and the Homology of Intersection Spaces
Deformation of Singularities and the Homology of Intersection Spaces
复制标题
奇点的变形与交空间的同调
DOI:
10.1142/s1793525312500185
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
L. Maxim
中科院分区:
文献类型:
--
作者:
Markus Banagl;L. Maxim
While intersection cohomology is stable under small resolutions, both ordinary and intersection cohomology are unstable under smooth deformation of singularities. For complex projective algebraic hypersurfaces with an isolated singularity, we show that the first author's cohomology of intersection spaces is stable under smooth deformations in all degrees except possibly the middle, and in the middle degree precisely when the monodromy action on the cohomology of the Milnor fiber is trivial. In many situations, the isomorphism is shown to be a ring homomorphism induced by a continuous map. This is used to show that the rational cohomology of intersection spaces can be endowed with a mixed Hodge structure compatible with Deligne's mixed Hodge structure on the ordinary cohomology of the singular hypersurface. Regardless of monodromy, the middle degree homology of intersection spaces is always a subspace of the homology of the deformation, yet itself contains the middle intersection homology group, the ordinary homology of the singular space, and the ordinary homology of the regular part.
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DOI:
10.1142/s0217732397000546
发表时间:
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影响因子:
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DOI:
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