Combinatorial Solution of the Eclectic Spin Chain

Abstract

The one-loop dilatation operator in the holomorphic 3-scalar sector of the dynamical fishnet theory is studied. Due to the non-unitary nature of the underlying field theory this operator, dubbed the eclectic spin chain Hamiltonian, is non-diagonalisable. The corresponding spectrum of Jordan blocks leads to logarithms in the two-point functions, which is characteristic of logarithmic conformal field theories. It was previously conjectured that for certain filling conditions and generic couplings the spectrum of the eclectic model is equivalent to the spectrum of a simpler model, the hypereclectic spin chain. We provide further evidence for this conjecture, and introduce a generating function which fully characterises the Jordan block spectrum of the simplified model. This function is found by purely combinatorial means and is simply related to the q-binomial coefficient.

arXiv comment31 pages

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Cited by in corpus (6)

• The Loom for General Fishnet CFTs
• Form-factors and complete basis of observables via separation of variables for higher rank spin chains
• Jordan blocks and the Bethe ansatz II: The eclectic spin chain beyond $K=1$
• Light-cone limits of large rectangular fishnets
• Jordan blocks and the Bethe ansatz III: Class 5 model and its symmetries
• An integrable deformed Landau-Lifshitz model with particle production?