Density matrix of a finite sub-chain of the Heisenberg anti-ferromagnet
arXiv:hep-th/0506171 · doi:10.1007/s11005-006-0054-x
Abstract
We consider a finite sub-chain on an interval of the infinite XXX model in the ground state. The density matrix for such a subsystem was described in our previous works for the model with inhomogeneous spectral parameters. In the present paper, we give a compact formula for the physically interesting case of the homogeneous model.
6 pages, some formulas are refined