Rota--Baxter operators and skew left brace structures over Heisenberg Group

Abstract

Rota--Baxter operators over groups have been recently defined in \cite{LHY2021}, and they share a close connection with skew braces, as demonstrated in \cite{VV2022}. In this paper, we classify all Rota--Baxter operators of weight 1 over the Heisenberg Lie algebra of dimension 3 by directly solving the operators defining equations. Using the fact that the exponential map from the Heisenberg Lie algebra to the Heisenberg Group is bijective, we induces these operators to the Heisenberg Group. Finally, we enumerate all skew left brace structures over the Heisenberg Group induced by these Rota--Baxter operators.