Bethe Algebra of Homogeneous XXX Heisenberg Model Has Simple Spectrum

Details Bethe Algebra of Homogeneous XXX Heisenberg Model Has Simple Spectrum Bethe Algebra of Homogeneous XXX Heisenberg Model Has Simple Spectrum

2007-06-05

arxiv.org/abs/0706.0688v1

Mathematics

Quantum Algebra

latex, 39 pages

Scientific paper

We show that the algebra of commuting Hamiltonians of the homogeneous XXX Heisenberg model has simple spectrum on the subspace of singular vectors of the tensor product of two-dimensional $gl_2$-modules. As a byproduct we show that there exist exactly $\binom {n}{l}-\binom{n}{l-1}$ two-dimensional vector subspaces $V \subset \C[u]$ with a basis $f,g\in V$ such that $\deg f = l, \deg g = n-l+1$ and $f(u)g(u-1) - f(u-1)g(u) = (u+1)^n$.

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