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arXiv 1607.04869math.RAmath.QAmath.RT
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$\operatorname{SL}_2$分布代数的量子形式

A quantum version of the algebra of distributions of $\operatorname{SL}_2$

Iván Angiono

摘要:

设$λ$是$\ell$阶单位元的原根.引入了复数上的一类有限维代数$\{\mathcal{D}_{λ,N}(\mathfrak{sl}_2)\}_{N\in\mathbb{N}_0}$,使得$\mathcal{D}_{λ,N}(\mathfrak{sl}_2)$是$\mathcal{D}_{λ,M}(\mathfrak{sl}_2)$的子代数,如果$N<M$,并且$\mathcal{D}_{λ,N-1}(\mathfrak{sl}_2)\subset \mathcal{D}_{λ,N}(\mathfrak{sl}_2)$是$\mathfrak{u}_λ(\mathfrak{sl}_2)$ -cleft扩张.简单$\mathcal{D}_{λ,N}(\mathfrak{sl}_2)$ -模块$(\mathcal{L}_{N}(p))_{0\le p<\ell^{N+1}}$是最高权重模块,允许张量积分解:第一个因子是简单$\mathfrak{u}_λ(\mathfrak{sl}_2)$ -模块,第二个因子是简单$\mathcal{D}_{λ,N-1}(\mathfrak{sl}_2)$ -模块。这种因式分解类似于相应的Steinberg分解,代数家族类似于$\operatorname{SL}_2$的分布代数作为有限维子代数的过滤的表示。

英文摘要:

Let $λ$ be a primitive root of unity of order $\ell$. We introduce a family of finite-dimensional algebras $\{\mathcal{D}_{λ,N}(\mathfrak{sl}_2)\}_{N\in\mathbb{N}_0}$ over the complex numbers, such that $\mathcal{D}_{λ,N}(\mathfrak{sl}_2)$ is a subalgebra of $\mathcal{D}_{λ,M}(\mathfrak{sl}_2)$ if $N<M$, and $\mathcal{D}_{λ,N-1}(\mathfrak{sl}_2)\subset \mathcal{D}_{λ,N}(\mathfrak{sl}_2)$ is a $\mathfrak{u}_λ(\mathfrak{sl}_2)$-cleft extension. The simple $\mathcal{D}_{λ,N}(\mathfrak{sl}_2)$-modules $(\mathcal{L}_{N}(p))_{0\le p<\ell^{N+1}}$ are highest weight modules, which admit a tensor product decomposition: the first factor is a simple $\mathfrak{u}_λ(\mathfrak{sl}_2)$-module and the second factor is a simple $\mathcal{D}_{λ,N-1}(\mathfrak{sl}_2)$-module. This factorization resembles the corresponding Steinberg decomposition, and the family of algebras resembles the presentation of algebra of distributions of $\operatorname{SL}_2$ as a filtration by finite-dimensional subalgebras.

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