Jack polynomials in superspace

TL;DR

This paper introduces orthogonal symmetric polynomials in superspace that generalize Jack polynomials, using two approaches: eigenfunction construction and symmetrization of non-symmetric Jack polynomials, with stable expansion coefficients and explicit norms.

Contribution

It presents the first study of orthogonal Jack polynomials in superspace, extending classical theory with novel eigenfunction and symmetrization methods.

Findings

Orthogonal eigenfunctions are obtained by diagonalizing conserved charges.

Expansion coefficients are stable with respect to the number of variables.

Norms of the polynomials are explicitly calculated.

Abstract

This work initiates the study of {\it orthogonal} symmetric polynomials in superspace. Here we present two approaches leading to a family of orthogonal polynomials in superspace that generalize the Jack polynomials. The first approach relies on previous work by the authors in which eigenfunctions of the supersymmetric extension of the trigonometric Calogero-Moser-Sutherland Hamiltonian were constructed. Orthogonal eigenfunctions are now obtained by diagonalizing the first nontrivial element of a bosonic tower of commuting conserved charges not containing this Hamiltonian. Quite remarkably, the expansion coefficients of these orthogonal eigenfunctions in the supermonomial basis are stable with respect to the number of variables. The second and more direct approach amounts to symmetrize products of non-symmetric Jack polynomials with monomials in the fermionic variables. This time, the orthogonality is inherited from the orthogonality of the non-symmetric Jack polynomials, and the value of the norm is given explicitly.