Abstract:
For the exactly integrable isotropic Heisenberg model of the chain of $N$ spins $s$,
numerical solutions of the Bethe-ansatz equations are obtained which correspond to the
antiferromagnetic vacuum (for $sN\leq 128$) and the simplest excitations. At $s=1$, the
complete set of states is presented for $N=6$ and the vacuum solution is estimated analytically
for finite $N$. Deviations from the “string” picture for large $N$ are discussed.
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