Published online by Cambridge University Press: 20 November 2018
We revisit with another view point the construction by R. Brylinski and B. Kostant of minimal representations of simple Lie groups. We start from a pair $\left( V,\,Q \right)$, where
$V$ is a complex vector space and
$Q$ a homogeneous polynomial of degree 4 on
$V$. The manifold
$\Xi $ is an orbit of a covering of Conf
$\left( V,\,Q \right)$, the conformal group of the pair
$\left( V,\,Q \right)$, in a finite dimensional representation space. By a generalized Kantor-Koecher-Tits construction we obtain a complex simple Lie algebra
$\mathfrak{g}$, and furthermore a real form
${{\mathfrak{g}}_{\mathbb{R}}}$. The connected and simply connected Lie group
${{G}_{\mathbb{R}}}$ with
$\text{Lie}\left( {{G}_{\mathbb{R}}} \right)\,=\,{{\mathfrak{g}}_{\mathbb{R}}}$ acts unitarily on a Hilbert space of holomorphic functions defined on the manifold
$\Xi $.