Density matrix of a finite sub-chain of the Heisenberg anti-ferromagnet

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.

arXiv comment6 pages, some formulas are refined

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