Murnaghan-Type Representations for the Positive Elliptic Hall Algebra

Abstract

We construct a new family of graded representations ${\tilde{W}}_{\lambda }$ for the positive elliptic Hall algebra ${\mathcal{E}}^{+}$ indexed by Young diagrams $\lambda$ which generalize the standard ${\mathcal{E}}^{+}$ action on symmetric functions. These representations have homogeneous bases of eigenvectors for the action of the Macdonald element $P_{0,1}\in {\mathcal{E}}^{+}$ with distinct $\mathbb{Q}(q,t)$-rational spectrum generalizing the symmetric Macdonald functions. The analysis of the structure of these representations exhibits interesting combinatorics arising from the limits of periodic standard Young tableaux. We find an explicit combinatorial rule for the action of the multiplication operators $e_r^{\bullet }$ generalizing the Pieri rule for symmetric Macdonald functions.

arXiv commentThis is the complete version of the author's accepted FPSAC24 extended abstract arXiv:2310.10249