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arXiv 1111.6329math.QAmath.RT
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临界水平上的W-代数

W-algebras at the critical level

Tomoyuki Arakawa

摘要:

设g是复单李代数,f是g的幂零元.证明了(1)与(g,f)相关联的W-代数$W^{cri}(g,f)$在临界水平上的中心与与g相关联的仿射李代数的Feigin-Frenkel中心重合,(2)$W^{cri}(g,f)$对应于圆盘上的oper $χ$的无中心商$W_χ(g,f)$是单的,(3)单商$W_χ(g,f)$是f处的Slodowy切片与g的幂零锥相交的jet方案的量子化。

英文摘要:

Let g be a complex simple Lie algebra, f a nilpotent element of g. We show that (1) the center of the W-algebra $W^{cri}(g,f)$ associated with (g,f) at the critical level coincides with the Feigin-Frenkel center of the affine Lie algebra associated with g, (2) the centerless quotient $W_χ(g,f)$ of $W^{cri}(g,f)$ corresponding to an oper $χ$ on the disc is simple, (3) the simple quotient $W_χ(g,f)$ is a quantization of the jet scheme of the intersection of the Slodowy slice at f with the nilpotent cone of g.

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