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arXiv 0708.2202math.QAmath.OA
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局部紧量子群。雷德福$S^4$公式

Locally compact quantum groups. Radford's $S^4$ formula

A. Van Daele

摘要:

设$A$是一个有限维的Hopf代数. $A$上的左积分和右积分通过$A$的一个特殊的类群元$δ$联系起来。类似地,在对偶Hopf代数$\hat A$中也有这个元素$\hatδ$。Radford证明了$A$中所有$a$的$$S^4(a)=δ^{-1}(\hatδ\triangleright a \triangleleft \hatδ^{-1})δ$$,其中$S$是$A$的对极,其中$\triangleright$和$\triangleleft$用于表示$\hat A$对$A$的标准左和右动作。该公式对于具有积分的乘子霍普夫代数(代数量子群)仍然成立。在局部紧量子群的理论中,Radford公式的一个解析形式可以被证明(根据希尔伯特空间上的有界算子)。在这次演讲中,我们不打算讨论雷德福公式本身,而是使用它,与相关公式一起,说明从Hopf代数理论(包括紧致量子群)到乘子Hopf代数(包括离散量子群)以及更一般的局部紧致量子群理论的道路的各个方面。

英文摘要:

Let $A$ be a finite-dimensional Hopf algebra. The left and the right integrals on $A$ are related by means of a distinguished group-like element $δ$ of $A$. Similarly, there is this element $\hatδ$ in the dual Hopf algebra $\hat A$. Radford showed that $$S^4(a)=δ^{-1}(\hatδ\triangleright a \triangleleft \hatδ^{-1})δ$$ for all $a$ in $A$ where $S$ is the antipode of $A$ and where $\triangleright$ and $\triangleleft$ are used to denote the standard left and right actions of $\hat A$ on $A$. The formula still holds for multiplier Hopf algebras with integrals (algebraic quantum groups). In the theory of locally compact quantum groups, an analytical form of Radford's formula can be proven (in terms of bounded operators on a Hilbert space). In this talk, we do not have the intention to discuss Radford's formula as such, but rather to use it, together with related formulas, for illustrating various aspects of the road that takes us from the theory of Hopf algebras (including compact quantum groups) to multiplier Hopf algebras (including discrete quantum groups) and further to the more general theory of locally compact quantum groups.

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