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Ideals of the Quantum Group Algebra, Arens Regularity and Weakly Compact Multipliers
Canadian Mathematical Bulletin ( IF 0.6 ) Pub Date : 2020-01-30 , DOI: 10.4153/s0008439520000077
Mehdi Nemati , Maryam Rajaei Rizi

Let $\mathbb{G}$ be a locally compact quantum group and let $I$ be a closed ideal of $L^{1}(\mathbb{G})$ with $y|_{I}\neq 0$ for some $y\in \text{sp}(L^{1}(\mathbb{G}))$ . In this paper, we give a characterization for compactness of $\mathbb{G}$ in terms of the existence of a weakly compact left or right multiplier $T$ on $I$ with $T(f)(y|_{I})\neq 0$ for some $f\in I$ . Using this, we prove that $I$ is an ideal in its second dual if and only if $\mathbb{G}$ is compact. We also study Arens regularity of $I$ whenever it has a bounded left approximate identity. Finally, we obtain some characterizations for amenability of $\mathbb{G}$ in terms of the existence of some $I$ -module homomorphisms on $I^{\ast \ast }$ and on  $I^{\ast }$ .



中文翻译:

量子群代数,Arens正则性和弱紧乘子的理想选择

$ \ mathbb {G} $ 为局部紧致量子群,令 $ I $ $ L ^ {1}(\ mathbb {G})$ $ y | _ {I} \ neq 0 $ 的封闭理想对于 \ text {sp}(L ^ {1}(\ mathbb {G}))$中的某些$ y \ 。在本文中,我们给出的紧凑表征 $ \ mathbb {G} $ 右乘数弱紧凑左存在的条款或 $ T $ $ I $ $ T(F)(Y | _ {I })\ NEQ 0 $ 一些 在I $ $ F \ 。由此证明,只有当 $ \ mathbb {G} $ 是紧凑的时, $ I $ 才是第二个对偶的理想选择。我们还研究了Arens的规律 $ I $ 只要具有有限的左近似身份。最后,根据在 $ I ^ {\ ast \ ast} $ $ I ^ {\ ast} $ 上 存在的 $ I $- 模块同态性,我们获得了对 $ \ mathbb {G} $的 适应性的一些表征。。

更新日期:2020-01-30
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