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arXiv math/0308275math.QAgr-qchep-thmath-phmath.AGmath.MPmath.OA
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模空间与非对易3-球面的结构

Moduli space and structure of noncommutative 3-spheres

Alain Connes, Michel Dubois-Violette

摘要:

分析了非对易3-球面的模空间和结构。我们发展了二次代数的中心二次型的概念,并证明了一个一般的代数结果,它大大地改进了从二次代数到与特征簇相关联的叉积代数的经典同态,并得到了更丰富的叉积.它允许控制对合二次代数上的$C^\ast$ -范数,并在所需的一般性中构造微分学。用酉么模对称矩阵的对称空间中点对的等价类来刻划非交换3-球面的模空间。将模空间的标度叶理标识为SO(6)的虚表示特征的梯度流。它的通轨是椭圆曲线实部的连通分量,椭圆曲线构成一个共有8个点的双二次曲线网。我们表明,一般这些曲线是相同的特征品种相关联的二次代数。然后,我们应用中心二次型的一般理论,证明了非交换3-球面允许一个自然的分歧覆盖$π$由一个非交换的3维nilmanifold。这就产生了微分学。然后,我们计算的分歧覆盖$π$的雅可比矩阵配对的直接图像的基本类的非交换的3-维零流形的陈特征标的定义酉和获得的答案作为产品的周期(椭圆积分)由一个有理函数.

英文摘要:

We analyse the moduli space and the structure of noncommutative 3-spheres. We develop the notion of central quadratic form for quadratic algebras, and prove a general algebraic result which considerably refines the classical homomorphism from a quadratic algebra to a cross-product algebra associated to the characteristic variety and lands in a richer cross-product. It allows to control the $C^\ast$-norm on involutive quadratic algebras and to construct the differential calculus in the desired generality. The moduli space of noncommutative 3-spheres is identified with equivalence classes of pairs of points in a symmetric spaceof unitary unimodular symmetric matrices. The scaling foliation of the moduli space is identified to the gradient flow of the character of a virtual representation of SO(6). Its generic orbits are connected components of real parts of elliptic curves which form a net of biquadratic curves with 8 points in common. We show that generically these curves are the same as the characteristic variety of the associated quadratic algebra. We then apply the general theory of central quadratic forms to show that the noncommutative 3-spheres admit a natural ramified covering $π$ by a noncommutative 3-dimensional nilmanifold. This yields the differential calculus. We then compute the Jacobian of the ramified covering $π$ by pairing the direct image of the fundamental class of the noncommutative 3--dimensional nilmanifold with the Chern character of the defining unitary and obtain the answer as the product of a period (of an elliptic integral) by a rational function...

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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