Advances in Mathematics ( IF 1.7 ) Pub Date : 2021-02-11 , DOI: 10.1016/j.aim.2021.107625 Gurbir Dhillon
Let be a simple Lie algebra, and let be the affine -algebra associated to a principal nilpotent element of and level κ. We explain a duality between the categories of smooth modules at levels and , where is the critical level. Their pairing amounts to a construction of semi-infinite cohomology for the -algebra.
As an application, we determine all homomorphisms between the Verma modules for , verifying a conjecture from the conformal field theory literature of de Vos–van Driel. Along the way, we determine the linkage principle for Category of the -algebra.
中文翻译:
半无限同调和的联结原理 -代数
让 做一个简单的李代数, 仿射 与-的主要幂等元素相关的-代数 和水平κ。我们解释了平滑类别之间的对偶 各个级别的模块 和 , 在哪里 是关键水平。它们的配对构成了半无限同调的构造-代数。
作为一个应用程序,我们确定Verma模块之间的所有同态为 ,从de Vos–van Driel的共形场论文献中验证了一个猜想。在此过程中,我们确定类别的链接原则 的 -代数。