A Banach algebra encoding quantum group duality
Fuente:
arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866914343860305920 |
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| author | Crann, Jason Neufang, Matthias |
| author_facet | Crann, Jason Neufang, Matthias |
| contents | We introduce and study a new Banach algebra structure on the trace-zero subspace $\mathcal{T}(L^2(\mathbb{G}))_0$ of trace class operators for any locally compact quantum group $\mathbb{G}$; it is defined through a mixed Lie-type product of the two dual products on $\mathcal{T}(L^2(\mathbb{G}))$ arising from the canonical extensions of the co-products of $\mathbb{G}$ and $\widehat{\mathbb{G}}$. The surprising fact that this new product is indeed associative stems precisely from the duality of the latter two products. This, in particular, gives new faithful associative products on trace-zero matrices in $M_d(\mathbb{C})$. After establishing some basic properties, we show that the single algebra $\mathcal{T}(L^2(\mathbb{G}))_0$ captures simultaneous properties of $\mathbb{G}$ and $\widehat{\mathbb{G}}$, is faithful for a large class of quantum groups, and encodes both $M^r_{cb}(L^1(\mathbb{G}))$ and $M^r_{cb}(L^1(\widehat{\mathbb{G}}))$ as left, respectively right, completely bounded module maps on $\mathcal{T}(L^2(\mathbb{G}))$. We finish by exhibiting an analogous product on the trace-zero nuclear operators $\mathcal{N}(L^p(G))_0$ for a locally compact group $G$ and $p\in(1,\infty)$. Building on [7], our work suggests an approach for developing an $L^p$-version of locally compact quantum group theory. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_19589 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Banach algebra encoding quantum group duality Crann, Jason Neufang, Matthias Operator Algebras Functional Analysis We introduce and study a new Banach algebra structure on the trace-zero subspace $\mathcal{T}(L^2(\mathbb{G}))_0$ of trace class operators for any locally compact quantum group $\mathbb{G}$; it is defined through a mixed Lie-type product of the two dual products on $\mathcal{T}(L^2(\mathbb{G}))$ arising from the canonical extensions of the co-products of $\mathbb{G}$ and $\widehat{\mathbb{G}}$. The surprising fact that this new product is indeed associative stems precisely from the duality of the latter two products. This, in particular, gives new faithful associative products on trace-zero matrices in $M_d(\mathbb{C})$. After establishing some basic properties, we show that the single algebra $\mathcal{T}(L^2(\mathbb{G}))_0$ captures simultaneous properties of $\mathbb{G}$ and $\widehat{\mathbb{G}}$, is faithful for a large class of quantum groups, and encodes both $M^r_{cb}(L^1(\mathbb{G}))$ and $M^r_{cb}(L^1(\widehat{\mathbb{G}}))$ as left, respectively right, completely bounded module maps on $\mathcal{T}(L^2(\mathbb{G}))$. We finish by exhibiting an analogous product on the trace-zero nuclear operators $\mathcal{N}(L^p(G))_0$ for a locally compact group $G$ and $p\in(1,\infty)$. Building on [7], our work suggests an approach for developing an $L^p$-version of locally compact quantum group theory. |
| title | A Banach algebra encoding quantum group duality |
| topic | Operator Algebras Functional Analysis |
| url | https://arxiv.org/abs/2602.19589 |