Entire Functions on Lie Groups

TL;DR

This paper explores the algebra of entire functions on Lie groups, establishing a correspondence with holomorphic functions on their complexifications, and applies this to deformation quantization of the cotangent bundle.

Contribution

It introduces a one-to-one correspondence between entire functions on Lie groups and holomorphic functions on their complexifications, extending classical complex analysis to Lie group geometry.

Findings

Established a Fréchet algebra isomorphism between entire functions and holomorphic functions on complexifications.

Derived a strict deformation quantization of the holomorphic cotangent bundle.

Connected classical complex analysis with Lie group geometry through new algebraic structures.

Abstract

Every Lie group $G$ carries a distinguished algebra of particularly well-behaved real-analytic mappings: The entire functions $\mathcal{E}(G)$. They were introduced for the purposes of strict deformation quantization. This paper establishes a one-to-one correspondence between entire functions and holomorphic mappings $\mathcal{H}(G_\mathbb{C})$ on the universal complexification $G_\mathbb{C}$ of $G$ as Fr\'{e}chet algebras. Methodically, this is achieved by porting aspects of classical complex analysis into a left-invariant guise and by studying the geometry of $G_\mathbb{C}$. As a byproduct, we obtain a strict deformation quantization of the holomorphic cotangent bundle of any universal complexification.