Identity between restricted Cauchy sums for the $q$Whittaker and skew Schur polynomials
Abstract
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.
 Publication:

arXiv eprints
 Pub Date:
 June 2021
 DOI:
 10.48550/arXiv.2106.11913
 arXiv:
 arXiv:2106.11913
 Bibcode:
 2021arXiv210611913I
 Keywords:

 Mathematics  Combinatorics;
 Mathematical Physics;
 Mathematics  Probability
 EPrint:
 25 pages, 3 figures