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Refinement of Bethe ansatz string and its alternative

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Type
Preprint
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arXiv ID: cond-mat/0011467
Source
arXiv
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Unknown
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Abstract

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.

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