Conserved charges of non-Yangian type for the Frahm-Polychronakos spin chain

摘要

Through an A-expansion of the confined Calogero model with spin exchange interactions, we extract a generating function for the involutive conserved charges of the Frahm-Polychronakos spin chain. The resulting conservation laws possess the spin chain Yangian symmetry, although they are not expressible in terms of these Yangians. [References: 29]