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arXiv 2109.04444math.AG
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无限秩的局部自由扭层

Locally free twisted sheaves of infinite rank

Aise Johan de Jong, Max Lieblich, Minseon Shin

摘要:

本文研究了Gerbes上无限秩的扭向量丛,对Grothendieck关于Brauer群与上同调Brauer群相等的著名问题给出了新的解释.我们表明,放松版本的问题有一个肯定的答案,在许多情况下,但不是所有的情况下,包括任何代数空间的分辨率属性和任何代数空间通过捏两个闭子概形的射影概形。我们还讨论了无限秩Azumaya代数的一些可能的理论,考虑了一类新的射影簇上的“非常正”的无限秩向量丛,并证明了曲面中曲线上的无限秩向量丛可以从多个点提升到曲面上.

英文摘要:

We study twisted vector bundles of infinite rank on gerbes, giving a new spin on Grothendieck's famous problem on the equality of the Brauer group and cohomological Brauer group. We show that the relaxed version of the question has an affirmative answer in many, but not all, cases, including for any algebraic space with the resolution property and any algebraic space obtained by pinching two closed subschemes of a projective scheme. We also discuss some possible theories of infinite rank Azumaya algebras, consider a new class of "very positive" infinite rank vector bundles on projective varieties, and show that an infinite rank vector bundle on a curve in a surface can be lifted to the surface away from finitely many points.

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