Cup product, Fr\"{o}licher-Nijenhuis bracket and the derived bracket associated to Hom-Lie algebras

TL;DR

This paper develops new graded Lie algebra structures related to Hom-Lie algebras, introducing the cup product, Fr"{o}licher-Nijenhuis bracket, and derived bracket, with applications to deformation theory, Nijenhuis operators, and Rota-Baxter operators.

Contribution

It introduces novel graded Lie algebra constructions associated with Hom-Lie algebras, including the cup product, Fr"{o}licher-Nijenhuis bracket, and derived bracket, expanding the algebraic toolkit for studying Hom-Lie structures.

Findings

Defined the cup product bracket and applied it to deformation theory.

Constructed the Fr"{o}licher-Nijenhuis bracket and studied Nijenhuis operators.

Established a matched pair of graded Lie algebras involving the Nijenhuis-Richardson and Fr"{o}licher-Nijenhuis algebras.

Abstract

In this paper, we introduce some new graded Lie algebras associated with a Hom-Lie algebra. At first, we define the cup product bracket and its application to the deformation theory of Hom-Lie algebra morphisms. We observe an action of the well-known Hom-analogue of the Nijenhuis-Richardson graded Lie algebra on the cup product graded Lie algebra. Using the corresponding semidirect product, we define the Fr\"{o}licher-Nijenhuis bracket and study its application to Nijenhuis operators. We show that the Nijenhuis-Richardson graded Lie algebra and the Fr\"{o}licher-Nijenhuis algebra constitute a matched pair of graded Lie algebras. Finally, we define another graded Lie bracket, called the derived bracket that is useful to study Rota-Baxter operators on Hom-Lie algebras.