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arXiv 1004.0215math.OAmath.FA
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局部紧量子群通过Hilbert C $^*$ -模的乘子

Multipliers of locally compact quantum groups via Hilbert C$^*$-modules

Matthew Daws

摘要:

Gilbert的一个结果表明,Fourier代数$A(G)$的每个完全有界乘子$f$都由一对有界连续映射$α,β:G \rightarrow K$产生,其中$K$是希尔伯特空间,而$f(s^{-1}t) = (β(t)|α(s))$对所有$s,t\in G$都是.我们重铸这在某些希尔伯特C $^*$ -模块之间的伴随运营商的作用,并表明,一个类似的建设工程的完全有界左乘子的局部紧量子群。我们找到了处理右乘子的各种方法:其中一种方法涉及到观察相反的量子群,这就证明了(无界的)对极作用于完全有界乘子的空间,其作用方式自然地与我们的表示结果相互作用。对偶的通用量子群(在Kustermans的意义上)可以确定与子代数的完全有界乘数,我们展示了如何适应我们的框架。最后,这激发了一种处理双边乘数的方法。

英文摘要:

A result of Gilbert shows that every completely bounded multiplier $f$ of the Fourier algebra $A(G)$ arises from a pair of bounded continuous maps $α,β:G \rightarrow K$, where $K$ is a Hilbert space, and $f(s^{-1}t) = (β(t)|α(s))$ for all $s,t\in G$. We recast this in terms of adjointable operators acting between certain Hilbert C$^*$-modules, and show that an analogous construction works for completely bounded left multipliers of a locally compact quantum group. We find various ways to deal with right multipliers: one of these involves looking at the opposite quantum group, and this leads to a proof that the (unbounded) antipode acts on the space of completely bounded multipliers, in a way which interacts naturally with our representation result. The dual of the universal quantum group (in the sense of Kustermans) can be identified with a subalgebra of the completely bounded multipliers, and we show how this fits into our framework. Finally, this motivates a certain way to deal with two-sided multipliers.

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