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arXiv math/0611120math.QA
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顶点算子代数的扭模

Twisted modules for vertex operator algebras

Benjamin Doyon

摘要:

这一贡献主要是基于联合文件与Lepowsky和Milas,这些文件的某些部分转载于此。这些文件进一步扩大工程Lepowsky和米拉斯。在我们的联合文件,我解释的一般原则扭曲的模块顶点算子代数在其强大的制定使用正式系列,并得出一般的关系满足扭曲和untwisted顶点算子。使用这些,我证明了新的“等价”和“建设”定理,确定了一组充分条件,以有一个扭曲的模块的顶点算子代数,和一个简单的方法来构建扭曲的顶点算子映射。这实质上是将我们关于扭模的一般关系与李(Li,1996)的思想结合起来,李(Li,1996)利用不同的关系得到了类似的构造定理。然后,我展示了如何应用这些定理来构造海森堡顶点算子代数的扭曲模。本文用一种新的方法得到了显式扭顶点算子映射,特别是对Frenkel,Lepowsky和Meurman不久前构造的形式算子$Δ_x$给出了新的推导和表达式.最后,我转载了我们联合文件的部分内容。利用Heisenberg顶点算子代数中的无扭关系,讨论了圆上微分算子李代数的中心扩张关于负整数处的黎曼ζ函数的性质.这个代数的一个家庭的表示构造从扭曲模块的顶点算子代数,并与伯努利多项式在合理的价值。

英文摘要:

This contribution is mainly based on joint papers with Lepowsky and Milas, and some parts of these papers are reproduced here. These papers further extended works by Lepowsky and by Milas. Following our joint papers, I explain the general principles of twisted modules for vertex operator algebras in their powerful formulation using formal series, and derive general relations satisfied by twisted and untwisted vertex operators. Using these, I prove new "equivalence" and "construction" theorems, identifying a set of sufficient conditions in order to have a twisted module for a vertex operator algebra, and a simple way of constructing the twisted vertex operator map. This essentially combines our general relations for twisted modules with ideas of Li (1996), who had obtained similar construction theorems using different relations. Then, I show how to apply these theorems in order to construct twisted modules for the Heisenberg vertex operator algebra. I obtain in a new way the explicit twisted vertex operator map, and in particular give a new derivation and expression for the formal operator $Δ_x$ constructed some time ago by Frenkel, Lepowsky and Meurman. Finally, I reproduce parts of our joint papers. The untwisted relations in the Heisenberg vertex operator algebra are employed to explain properties of a certain central extension of a Lie algebra of differential operators on the circle, in relation to the Riemann Zeta function at negative integers. A family of representations for this algebra are constructed from twisted modules for the vertex operator algebra, and are related to the Bernoulli polynomials at rational values.

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