Identity between Restricted Cauchy Sums for the $q$-Whittaker and Skew Schur Polynomials

Takashi Imamura ; Matteo Mucciconi ; Tomohiro Sasamoto

Symmetry, integrability and geometry: methods and applications, Tome 20 (2024)

Résumé

The Cauchy identities play an important role in the theory of symmetric functions. It is known that Cauchy sums for the $q$-Whittaker and the skew Schur polynomials produce the same factorized expressions modulo a $q$-Pochhammer symbol. We consider the sums with restrictions on the length of the first rows for labels of both polynomials and prove an identity which relates them. The proof is based on techniques from integrable probability: we rewrite the identity in terms of two probability measures: the $q$-Whittaker measure and the periodic Schur measure. The relation follows by comparing their Fredholm determinant formulas.

Détail

Keywords: integrable probability, Kardar–Parisi–Zhang class, stochastic processes, Macdonald polynomials.

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