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arXiv 2005.04110math.RT
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关于秩为1的Kac-Moody代数的积分形式

On the integral form of rank 1 Kac-Moody algebras

Ilaria Damiani, Margherita Paolini

摘要:

本文证明了$A_2^{(2)}$型Kac-Moody代数的Drinfeld生成元$x_r^{\pm}$在整数上的除幂所生成的子代数是整数形式(严格小于Mitzman的(见[Mi]),我们将给出一个基,它推广了Garland在[G]中为无扭仿射Kac-Moody代数提供的基,我们将明确地确定对易关系。此外,我们证明,无论是在untwisted和扭曲的情况下,积极的(分别为负)虚部的积分形式是一个代数的多项式的整数。

英文摘要:

In this paper we shall prove that the subalgebra generated over the integers by the divided powers of the Drinfeld generators $x_r^{\pm}$ of the Kac-Moody algebra of type $A_2^{(2)}$ is an integral form (strictly smaller than Mitzman's (see [Mi]) of the enveloping algebra, we shall exhibit a basis generalizing the one provided by Garland in [G] for the untwisted affine Kac-Moody algebras, and we shall determine explicitly the commutation relations. Moreover we prove that both in the untwisted and in the twisted case the positive (respectively negative) imaginary part of the integral form is an algebra of polynomials over the integers.

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