与奇异曲面相关的纯动机、混合动机和动机的扩张
Pure motives, mixed motives and extensions of motives associated to singular surfaces
摘要:
我们首先回顾了周动机模型的构造,并研究了它的基本性质。利用Voevodsky的有效几何动机范畴,我们研究了非奇异爆破中例外因子的动机。如果除数的所有几何不可约分量都是亏格为零,那么Voevodsky的形式主义允许我们构造Chow动机的某些一扩展,作为具有曲面光滑部分的紧支撑的动机的典范子子。专门希尔伯特-布卢门撒尔曲面,我们恢复一个motivic解释最近建设的A。卡斯帕
英文摘要:
We first recall the construction of the Chow motive modelling intersection cohomology of a proper surface and study its fundamental properties. Using Voevodsky's category of effective geometrical motives, we then study the motive of the exceptional divisor in a non-singular blow-up. If all geometric irreducible components of the divisor are of genus zero, then Voevodsky's formalism allows us to construct certain one-extensions of Chow motives, as canonical sub-quotients of the motive with compact support of the smooth part of the surface. Specializing to Hilbert--Blumenthal surfaces, we recover a motivic interpretation of a recent construction of A. Caspar.
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