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Title:
Bethe Ansatz for XXX chain with negative spin
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Abstract:
XXX spin chain with spin $s=−1$ appears as an effective theory of Quantum Chromodynamics. It is equivalent to lattice nonlinear Schroediger's equation: interacting chain of harmonic oscillators [bosonic]. In thermodynamic limit each energy level is a scattering state of several elementary excitations [lipatons]. Lipaton is a fermion: it can be represented as a topological excitation [soliton] of original [bosonic] degrees of freedom, described by the group $Z_2$. We also provide the CFT description (including local quenches) and Yang-Yang thermodynamics of the model.
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