Cohomology, superderivations, and abelian extensions of $3$-Lie superalgebras

Abstract

The main object of study of this paper is the notion of 3-Lie superalgebras with superderivations. We consider a representation $(\Phi ,\mathcal{P})$ of a $3$-Lie superalgebra $\mathcal{Q}$ on $\mathcal{P}$ and construct first-order cohomologies by using superderivations of $\mathcal{P},\mathcal{Q}$ which induces a Lie superalgebra ${\mathcal{T}}_{\Phi }$ and its representation $\Psi$. Then we consider abelian extensions of $3$-Lie superalgebras of the form $0\to \mathcal{P}\hookrightarrow \mathcal{L}\to \mathcal{Q}\to 0$ with $[\mathcal{P},\mathcal{P},\mathcal{L}]=0$ and construct an obstruction class to extensibility of a compatible pair of superderivation. Moreover we prove that a pair of superderivation is extensible if and only if its obstruction class is trivial under some suitable conditions.