Differential-operator representations of Weyl group and singular vectors in Verma modules

作者：Xiao, Wei^*

来源：Science China Mathematics, 2018, 61(6): 1013-1038.

DOI：10.1007/s11425-016-9101-y

• Verma module
• singular vector
• differential equation
• differential operator
• Weyl group

Given a suitable ordering of the positive root system associated with a semisimple Lie algebra, there exists a natural correspondence between Verma modules and related polynomial algebras. With this, the Lie algebra action on a Verma module can be interpreted as a differential operator action on polynomials, and thus on the corresponding truncated formal power series. We prove that the space of truncated formal power series gives a differential-operator representation of the Weyl group W. We also introduce a system of partial differential equations to investigate singular vectors in the Verma module. It is shown that the solution space of the system in the space of truncated formal power series is the span of {w(1) vertical bar w is an element of W}. Those w(1) that are polynomials correspond to singular vectors in the Verma module. This elementary approach by partial differential equations also gives a new proof of the well-known BGG-Verma theorem.

• 出版日期2018-6
• 单位深圳大学