Representations of the Lie Superalgebra $\mathfrak{osp}(1|2n)$ with Polynomial Bases

Asmus K. Bisbo ; Hendrik De Bie ; Joris Van der Jeugt

Symmetry, integrability and geometry: methods and applications, Tome 17 (2021)

Résumé

We study a particular class of infinite-dimensional representations of $\mathfrak{osp}(1|2n)$. These representations $L_n(p)$ are characterized by a positive integer $p$, and are the lowest component in the $p$-fold tensor product of the metaplectic representation of $\mathfrak{osp}(1|2n)$. We construct a new polynomial basis for $L_n(p)$ arising from the embedding $\mathfrak{osp}(1|2np) \supset \mathfrak{osp}(1|2n)$. The basis vectors of $L_n(p)$ are labelled by semi-standard Young tableaux, and are expressed as Clifford algebra valued polynomials with integer coefficients in $np$ variables. Using combinatorial properties of these tableau vectors it is deduced that they form indeed a basis. The computation of matrix elements of a set of generators of $\mathfrak{osp}(1|2n)$ on these basis vectors requires further combinatorics, such as the action of a Young subgroup on the horizontal strips of the tableau.

Détail

Keywords: representation theory, Lie superalgebras, Clifford analysis
Mots-clés : Young tableaux, parabosons.

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