Invariant Conformal Killing-Yano $2$-forms on five dimensional Lie Groups

TL;DR

This paper classifies five-dimensional Lie algebras with invariant conformal Killing-Yano 2-forms, revealing new examples that lack Sasakian structures, thus advancing understanding of geometric structures on Lie groups.

Contribution

It provides a comprehensive classification of 5D metric Lie algebras with CKY 2-forms, including new examples without Sasakian structures.

Findings

Classified 5D metric Lie algebras with CKY tensors

Identified examples of CKY 2-forms without Sasakian structures

Extended understanding of geometric structures on Lie groups

Abstract

We study left invariant conformal Killing-Yano (CKY) $2$-forms on Lie groups endowed with a left invariant metric. We classify all $5$-dimensional metric Lie algebras carrying CKY tensors that are obtained as a one-dimensional central extension of 4-dimensional metric Lie algebras endowed with a invertible parallel skew-symmetric tensor. On the other hand, we also classify $5$-dimensional metric Lie algebras with center of dimension greater than one admitting strict CKY tensors. In addition, we determine all possible CKY tensors on these metric Lie algebras. In particular, we exhibit the first examples of CKY $2$-forms on metric Lie algebras which do not admit any Sasakian structure.