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arXiv 1105.0108math.RTmath-phmath.MP
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高阶扭朱代数

Higher level twisted Zhu algebras

Jethro Van Ekeren

摘要:

研究阶化顶点代数的扭曲表示对于理解共形场论中的轨道模型具有重要意义。本文考虑顶点代数$V$的一般构造,对于包含$\Z$的$\R$的子群$\G$,分次为$\G/\Z$,且Hamilton算子$H$具有实(但不一定是整数)特征值.构造了扭水平$p$朱代数$\zhu_{p, \G}(V)$的有向系统,证明了如下定理:对于每个$p$,其不可约$\zhu_{p, \G}(V)$ -模与不可约$\G$ -扭正能量$V$ -模之间存在一个双射,且$V$是$(\G, H)$ -有理数当且仅当它的所有朱代数$\zhu_{p, \G}(V)$都是有限维半单的.主要的新颖性是去除了$H$的整数特征值的假设。给出了泛包络顶点代数的水平$p$ Zhu代数的显式描述,特别是Virasoro顶点代数$\vir^c$和泛仿射Kac-Moody顶点代数$V^k(\g)$在非临界水平上的显式描述.我们还计算了这些有向代数系统的逆极限。

英文摘要:

The study of twisted representations of graded vertex algebras is important for understanding orbifold models in conformal field theory. In this paper we consider the general set-up of a vertex algebra $V$, graded by $\G/\Z$ for some subgroup $\G$ of $\R$ containing $\Z$, and with a Hamiltonian operator $H$ having real (but not necessarily integer) eigenvalues. We construct the directed system of twisted level $p$ Zhu algebras $\zhu_{p, \G}(V)$, and we prove the following theorems: For each $p$ there is a bijection between the irreducible $\zhu_{p, \G}(V)$-modules and the irreducible $\G$-twisted positive energy $V$-modules, and $V$ is $(\G, H)$-rational if and only if all its Zhu algebras $\zhu_{p, \G}(V)$ are finite dimensional and semisimple. The main novelty is the removal of the assumption of integer eigenvalues for $H$. We provide an explicit description of the level $p$ Zhu algebras of a universal enveloping vertex algebra, in particular of the Virasoro vertex algebra $\vir^c$ and the universal affine Kac-Moody vertex algebra $V^k(\g)$ at non-critical level. We also compute the inverse limits of these directed systems of algebras.

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