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arXiv 1012.1475math.QAmath.OA
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线丛与非交换几何中的Thom构造

Line bundles and the Thom construction in noncommutative geometry

E. J. Beggs, T. Brzezinski

摘要:

经典几何中的线丛概念通过Morita context的概念转移到非交换几何中。由此我们可以构造Z和N分次代数代数,Z分次代数代数是一个Hopf-Galois扩张.一个非退化的厄米特度量给出了这个代数上的一个星结构,并且在线丛上的一个附加的星运算给出了N分次代数上的一个星运算。在这种情况下,我们可以进行相关的圆丛和Thom构造。以一个C* 代数为基,在一些正性假设下,相关的圆和Thom代数也是C* 代数。最后,我们通过考察共变导数和陈类的线丛的方法后,小林和Nomizu。

英文摘要:

The idea of a line bundle in classical geometry is transferred to noncommutative geometry by the idea of a Morita context. From this we can construct Z and N graded algebras, the Z graded algebra being a Hopf-Galois extension. A non-degenerate Hermitian metric gives a star structure on this algebra, and an additional star operation on the line bundle gives a star operation on the N graded algebra. In this case, we can carry out the associated circle bundle and Thom constructions. Starting with a C* algebra as base, and with some positivity assumptions, the associated circle and Thom algebras are also C* algebras. We conclude by examining covariant derivatives and Chern classes on line bundles after the method of Kobayashi and Nomizu.

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