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arXiv 1903.03079math.RTmath.QAmath.RA
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限制移位Yangians与限制有限$W$ -代数

Restricted shifted Yangians and restricted finite $W$-algebras

Simon M. Goodwin, Lewis Topley

摘要:

我们研究了特征$p > 0$的代数闭域$\mathbb{k}$上的截断移位Yangian $Y_{n,l}(σ)$,已知它同构于与相应的幂零元$e\in \mathfrak{g} = \mathfrak{gl}_N(\mathbb{k})$相关联的有限$W$ -代数$U(\mathfrak{g}, e)$.我们得到一个明确的描述中心的$Y_{n,l}(σ)$,表明它是由它的Harish-Chandra中心和它的$p$ -中心。定义$Y_{n,l}^{[p]}(σ)$为$Y_{n,l}(σ)$与其$p$ -中心的平凡特征标的核所生成的理想的商.我们的主要定理指出,$Y_{n,l}^{[p]}(σ)$是同构的限制有限$W$ -代数$U^{[p]}(\mathfrak{g},e)$。作为结果,我们得到了这个限制$W$ -代数的显式表示。

英文摘要:

We study the truncated shifted Yangian $Y_{n,l}(σ)$ over an algebraically closed field $\mathbb{k}$ of characteristic $p > 0$, which is known to be isomorphic to the finite $W$-algebra $U(\mathfrak{g}, e)$ associated to a corresponding nilpotent element $e\in \mathfrak{g} = \mathfrak{gl}_N(\mathbb{k})$. We obtain an explicit description of the centre of $Y_{n,l}(σ)$, showing that it is generated by its Harish-Chandra centre and its $p$-centre. We define $Y_{n,l}^{[p]}(σ)$ to be the quotient of $Y_{n,l}(σ)$ by the ideal generated by the kernel of trivial character of its $p$-centre. Our main theorem states that $Y_{n,l}^{[p]}(σ)$ is isomorphic to the restricted finite $W$-algebra $U^{[p]}(\mathfrak{g},e)$. As a consequence we obtain an explicit presentation of this restricted $W$-algebra.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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