Abstract
Recently it has been conjectured that the ground state of a Markovian Hamiltonian, with one boundary operator, acting in a link pattern space is related to vertically and horizontally symmetric alternating-sign matrices (equivalently fully packed loop configurations (FPL) on a grid with special boundaries). We extend this conjecture by introducing an arbitrary boundary parameter. We show that the parameter dependent ground state is related to refined vertically symmetric alternating-sign matrices, i.e. with prescribed configurations (respectively, prescribed FPL configurations) in the next to central row.
We also conjecture a relation between the ground state of a Markovian Hamiltonian with two boundary operators and arbitrary coefficients and some doubly refined (dependence on two parameters) FPL configurations. Our conjectures might be useful in the study of ground states of the O (1) and XXZ models, as well as the stationary states of Raise and Peel models.