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arXiv math/0006226math.QA
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量子群上自旋几何的协变微分方法

Spin Geometry on Quantum Groups via Covariant Differential Calculi

I. Heckenberger

摘要:

设A是一个具有对极S的余半单Hopf *-代数,$Γ$是A上的一阶左协变微分 *-演算,使得$Γ$是自对偶的,并且在Hopf代数自同构S^2下不变。引入量子Clifford代数$\Cl(Γ,σ,g)$,它作用于Woronowicz的外代数$Γ^\wedge$ . $\Cl(Γ,σ,g)$的极小左理想是A-双模,称为旋量模。研究了非对称旋量模。$Γ$上线性左联络的通常概念被推广到量子Clifford代数和旋量模。定义了相应的Dirac算子和联络Laplacian算子。对于量子群SL_q(2)及其双协变的$4D_\pm$演算,我们详细地研究了这些概念.给出了Bochner定理的一个推广。确定了给定旋量模上的所有不变微分算子。计算了Dirac算子的本征值。关键词:量子群,协变微分学,自旋几何

英文摘要:

Let A be a cosemisimple Hopf *-algebra with antipode S and let $Γ$ be a left-covariant first order differential *-calculus over A such that $Γ$ is self-dual and invariant under the Hopf algebra automorphism S^2. A quantum Clifford algebra $\Cl(Γ,σ,g)$ is introduced which acts on Woronowicz' external algebra $Γ^\wedge$. A minimal left ideal of $\Cl(Γ,σ,g)$ which is an A-bimodule is called a spinor module. Metrics on spinor modules are investigated. The usual notion of a linear left connection on $Γ$ is extended to quantum Clifford algebras and also to spinor modules. The corresponding Dirac operator and connection Laplacian are defined. For the quantum group SL_q(2) and its bicovariant $4D_\pm$-calculi these concepts are studied in detail. A generalization of Bochner's theorem is given. All invariant differential operators over a given spinor module are determined. The eigenvalues of the Dirac operator are computed. Keywords: quantum groups, covariant differential calculus, spin geometry

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