Large-deformation limit conjecture for the ASEP ground state and current generating function

The partially asymmetric simple exclusion process is described using a deformed Markov matrix, with deformation parameter ξ\xi and system variables x\mathbf{x}. For each positive integer mm, let Ψ(m)(x;s){|\Psi^{(m)}(\mathbf{x};s)\rangle} be the twice deformed ground state vector, let Z(m)(x;s)\mathcal{Z}^{(m)}(\mathbf{x};s) be its normalising function, and impose s=ξ1/ms=\xi^{1/m}. Let Ψ0(x;ξ){|\Psi_0(\mathbf{x};\xi)\rangle} and F0(x;ξ)F_0(\mathbf{x};\xi) be functions associated with the limiting state and generating function. Large-deformation limit conjecture. As mm tends to infinity, both the normalised twice deformed ground state vector and the scaled logarithm of its normalising function converge according to

limmΨ(m)(x;s=ξ1/m)Z(m)(x;s=ξ1/m)=Ψ0(x;ξ),\lim_{m\to\infty}\frac{{|\Psi^{(m)}(\mathbf{x};s=\xi^{1/m})\rangle}}{\mathcal{Z}^{(m)}(\mathbf{x};s=\xi^{1/m})}={|\Psi_0(\mathbf{x};\xi)\rangle}, limmln(ξ)mln(Z(m)(x;s=ξ1/m))=F0(x;ξ),\lim_{m\to\infty}\frac{\ln(\xi)}{m}\ln\left(\mathcal{Z}^{(m)}(\mathbf{x};s=\xi^{1/m})\right)=F_0(\mathbf{x};\xi),

where Ψ0{|\Psi_0\rangle} and F0F_0 are regular functions of x\mathbf{x}. This conjecture is intended to connect the qqKZ and Koornwinder-polynomial construction with the ground state and current-cumulant generating function of the deformed ASEP in the mm\to\infty limit; the supplied text does not indicate whether it has been resolved.

Sources & referencesView supporting material

Primary source

C. Finn and M. Vanicat, “Matrix product construction for Koornwinder polynomials and fluctuations of the current in the open ASEP”, arXiv:1610.08320 (2017).

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