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TT[over ¯] Deformations and Integrable Spin Chains
Enrico Marchetto1,2, Alessandro Sfondrini1,3,4, Zhou Yang3
1Dipartimento di Fisica e Astronomia "Galileo Galilei", Università degli Studi di Padova, via Marzolo 8, 35131 Padova, Italy.
Abstract:
We consider current-current deformations that generalize TT[over ¯] ones, and show that they may be also introduced for integrable spin chains. In analogy with the integrable QFT setup, we define the deformation as a modification of the S matrix in the Bethe equations. Using results by Bargheer, Beisert and Loebbert we show that the deforming operator is composite and constructed out of two currents on the lattice; its expectation value factorizes like for TT[over ¯]. Such a deformation may be considered for any combination of charges that preserve the model's integrable structure.
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