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arXiv 0810.0030math.QAmath.DG
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代数体堆的变形

Deformations of algebroid stacks

Paul Bressler, Alexander Gorokhovsky, Ryszard Nest, Boris Tsygan

摘要:

本文研究了代数体叠在标准广群上的变形。我们构造了一个微分分次李代数(DGLA)来控制这种变形理论。当代数胚是函数的扭曲形式时,我们证明了这个DGLA通过相应的gerbe的示性类拟同构于群胚上函数代数上Hochschild余链的DGLA的扭曲.

英文摘要:

In this paper we consider deformations of an algebroid stack on an etale groupoid. We construct a differential graded Lie algebra (DGLA) which controls this deformation theory. In the case when the algebroid is a twisted form of functions we show that this DGLA is quasiisomorphic to the twist of the DGLA of Hochschild cochains on the algebra of functions on the groupoid by the characteristic class of the corresponding gerbe.

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