A minimal representation of the orthosymplectic Lie supergroup

TL;DR

This paper constructs a minimal representation of the orthosymplectic Lie supergroup $OSp(p,q|2n)$, extending classical minimal representations to the superalgebra setting using orbit and Jordan superalgebra techniques.

Contribution

It introduces a new minimal representation for $OSp(p,q|2n)$ based on orbit philosophy, generalizing classical models to Lie superalgebras.

Findings

Representation realized on functions on minimal orbit

Annihilator is a Joseph-like ideal

Gelfand--Kirillov dimension computed

Abstract

We construct a minimal representation of the orthosymplectic Lie supergroup $OSp(p,q|2n)$, generalising the Schr\"odinger model of the minimal representation of $O(p,q)$ to the super case. The underlying Lie algebra representation is realized on functions on the minimal orbit inside the Jordan superalgebra associated with $\mathfrak{osp}(p,q|2n)$, so that our construction is in line with the orbit philosophy. Its annihilator is given by a Joseph-like ideal for $\mathfrak{osp}(p,q|2n)$, and therefore the representation is a natural generalization of a minimal representations to the context of Lie superalgebras. We also calculate its Gelfand--Kirillov dimension and construct a non-degenerate sesquilinear form for which the representation is skew-symmetric and which is the analogue of an $L^2$-inner product in the supercase.