2013/05/31 by Kohei Motegi, Kazumitsu Sakai · 3 citations
Physics and Astronomy · Mathematics · #math-ph #cond-mat.stat-mech #math.MP #math.QA #nlin.SI
paper · pdf · doi:10.1088/1751-8113/46/35/355201
published as J. Phys. A: Math. Theor. 46 (2013) 355201 · 30 pages, 8 figures, v3:discussions on orthogonality relations added
arxiv created 2013/06/19 · arxiv updated 2013/08/12
We examine the wavefunctions and their scalar products of a one-parameter family of integrable five vertex models. At a special point of the parameter, the model investigated is related to an irreversible interacting stochastic particle system the so-called totally asymmetric simple exclusion process (TASEP). By combining the quantum inverse scattering method with a matrix product representation of the wavefunctions, the on/off-shell wavefunctions of the five vertex models are represented as a certain determinant form. Up to some normalization factors, we find the wavefunctions are given by Grothendieck polynomials, which are a one-parameter deformation of Schur polynomials. Introducing a dual version of the Grothendieck polynomials, and utilizing the determinant representation for the scalar products of the wavefunctions, we derive a generalized Cauchy identity satisfied by the Grothendieck polynomials and their duals. Several representation theoretical formulae for Grothendieck polynomials are also presented. As a byproduct, the relaxation dynamics such as Green functions for the periodic TASEP are found to be described in terms of Grothendieck polynomials.