When are two HKR isomorphisms equal?
When are two HKR isomorphisms equal?
复制标题
什么时候两个 HKR 同构相等?
DOI:
10.1016/j.aim.2023.109246
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发表时间:
2023
影响因子:
1.7
通讯作者:
Huang S
中科院分区:
文献类型:
--
作者:
Huang S
Abstract Let X↪ S be a closed embedding of smooth schemes which splits to first order. An HKR isomorphism is an isomorphism between the shifted normal bundle N X/S [− 1] and the derived self-intersection X× S R X. Given two different first order splittings of a closed embedding, one can obtain two HKR isomorphisms using a construction of Arinkin and Căldăraru. A priori, it is not known if the two isomorphisms are equal or not. We define the generalized Atiyah class of a vector bundle on X associated to a closed embedding and two first order splittings. We use the generalized Atiyah class to give sufficient and necessary conditions for when the two HKR isomorphisms are equal over X and over X× X respectively. When i is the diagonal embedding, there are two natural projections from X× X to X. We show that the HKR isomorphisms defined by the two projections are equal over X, but not equal over X× X in general.
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DOI:
10.1112/jlms/jdn064
发表时间:
2006-10
期刊:
Journal of the London Mathematical Society
影响因子:
--
作者:
N. Markarian
通讯作者:
N. Markarian
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
Julien Grivaux
通讯作者:
Julien Grivaux
DOI:
10.1016/j.aim.2012.05.014
发表时间:
2010
期刊:
arXiv: Algebraic Geometry
影响因子:
--
作者:
D. Arinkin;Andrei Căldăraru
通讯作者:
Andrei Căldăraru
影响因子:
0.9
作者:
Arinkin, Dima;Căldăraru, Andrei;Hablicsek, Márton
通讯作者:
Hablicsek, Márton
影响因子:
0.9
作者:
Julien Grivaux
通讯作者:
Julien Grivaux