Refinement of Bethe ansatz string and its alternative
Abstract
Description
The well known string solution to Bethe ansatz equations is shown to be inconsistent in its widely accepted form. A valid refinement demanding higher order corrections in subsequent roots is identified. A new alternative string solution is proposed for finite long chains, consistent with the non-Bethe strings observed earlier.
Revtex, 5 pages, no figure
Revtex, 5 pages, no figure