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The Voisin map via families of extensions
Mathematische Zeitschrift ( IF 0.8 ) Pub Date : 2021-04-28 , DOI: 10.1007/s00209-021-02747-1
Huachen Chen

Let Y be a cubic fourfold not containing any plane, F(Y) be the variety of lines in Y, Z(Y) be the Lehn-Lehn-Sorger-van Straten hyperkähler eightfold constructed in Lehn et al. (J für die Reine und Angewandte Math (Crelles J) 2017(731):87–128, 2017). In Voisin (Remarks and questions on Coisotropic subvarieties and 0-cycles of hyper-Kähler varieties. Springer International Publishing, Berlin, 2016), Voisin defined a degree six rational map \(v: F(Y)\times F(Y) \dashrightarrow Z(Y),\) relating the two hyperkähler varieties F(Y) and Z(Y). In this note, we reinterpret this map v using moduli spaces of Bridgeland stable objects in a triangulated category associated with Y, called a Kuznetsov component of Y. We prove that the Voisin map v can be resolved by blowing up the incident locus of intersecting lines in \(F(Y)\times F(Y)\) endowed with the reduced scheme structure. As a consequence of our approach, we also show that the above-mentioned blowup is a relative Quot scheme over Z(Y) parameterizing quotients in a heart of the Kuznetsov component of Y.



中文翻译:

通过扩展族的Voisin地图

ý是不含有任何平面中的立方四倍,˚Fÿ)是各种线ÝŽÿ)是莱恩-莱恩-Sorger面包车Stratenhyperkähler八倍构造在莱恩等。(《 Reine和Angewandte数学》,2017年(731):87-128,2017年)。在Voisin中(关于高Kähler变体的各向同性亚变数和0循环的评论和问题。Springer国际出版社,柏林,2016年),Voisin定义了一个六阶有理图\(v:F(Y)\ times F(Y)\ dashrightarrow Z(Y),\)与两个hyperkähler变体FY)和ZY)。在这份说明中,我们重新诠释这个地图v使用Bridgeland稳定对象的模空间与相关的三角范畴Ÿ,叫的库兹涅佐夫组件ÿ。我们证明,通过简化方案结构赋予\(F(Y)\ times F(Y)\)中相交线的入射轨迹,可以分解Voisin映射v。作为我们的方法的结果,我们还表明,上述爆破是在相对QUOT方案žŸ中的库兹涅佐夫成分的心脏参数化商数)ÿ

更新日期:2021-04-29
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