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arXiv 1503.06357math.DGhep-thmath.SG
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稳定广义复结构

Stable generalized complex structures

Gil R. Cavalcanti, Marco Gualtieri

AI总结:

本文通过引入Lie algebroid将稳定广义复结构视为辛形式,构造了新例子并证明了形变无阻碍,同时建立了退化轨迹局部正规形式,证明紧稳定广义复4-流形具有辛完备性。

摘要:

稳定广义复结构是一般为辛结构,但在实余维二维子流形上退化,并在该处定义广义Calabi-Yau结构的结构。我们引入一个Lie algebroid,使我们可以将此类结构视为辛形式。这使我们能够构造稳定结构的新例子,并定义其形变的周期映射,其中背景三形式flux可以固定或不固定,从而证明两个形变问题均无阻碍。随后我们使用相同工具建立退化轨迹与Lagrangian branes的局部正规形式。将我们的正规形式应用于四维情形,我们证明任何紧稳定广义复4-流形都有辛完备,即它可以在其退化轨迹附近进行修改以产生紧辛4-流形。

英文摘要:

A stable generalized complex structure is one that is generically symplectic but degenerates along a real codimension two submanifold, where it defines a generalized Calabi-Yau structure. We introduce a Lie algebroid which allows us to view such structures as symplectic forms. This allows us to construct new examples of stable structures, and also to define period maps for their deformations in which the background three-form flux is either fixed or not, proving the unobstructedness of both deformation problems. We then use the same tools to establish local normal forms for the degeneracy locus and for Lagrangian branes. Applying our normal forms to the four-dimensional case, we prove that any compact stable generalized complex 4-manifold has a symplectic completion, in the sense that it can be modified near its degeneracy locus to produce a compact symplectic 4-manifold.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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