Hom-Lie Algebras with Symmetric Invariant NonDegenerate Bilinear Forms

TL;DR

This paper introduces quadratic Hom-Lie algebras with symmetric invariant nondegenerate bilinear forms, extending classical Lie algebra concepts and establishing new structural correspondences and representation theories.

Contribution

It develops constructions for quadratic Hom-Lie algebras, extends double extension theory, and links involutive quadratic Hom-Lie algebras to quadratic simple Lie algebras.

Findings

Extended double extension theory to Hom-Lie algebras

Characterized centerless involutive quadratic Hom-Lie algebras

Established correspondence with quadratic simple Lie algebras

Abstract

The aim of this paper is to introduce and study quadratic Hom-Lie algebras, which are Hom-Lie algebras with symmetric invariant nondegenerate bilinear forms. We provide several constructions leading to examples and extend the double extension theory to Hom-Lie algebras. We reduce the case where the twist map is invertible to the study of involutive quadratic Lie algebras. We establish a correspondence between the class of involutive quadratic Hom-Lie algebras and quadratic simple Lie algebras with symmetric involution. Centerless involutive quadratic Hom-Lie algebras are characterized. Also elements of a representation theory for Hom-Lie algebras, including adjoint and coadjoint representations are supplied with application to quadratic Hom-Lie algebras.