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On truncated generalized Gibbs ensembles in the Ising field theory. (English) Zbl 1457.82064

Summary: We discuss the implementation of two different truncated Generalized Gibbs Ensembles (GGE) describing the stationary state after a mass quench process in the Ising Field Theory. One truncated GGE is based on the semi-local charges of the model, the other on regularized versions of its ultra-local charges. We test the efficiency of the two different ensembles by comparing their predictions for the stationary state values of the single-particle Green’s function \(G(x)=\langle{{\psi}^{\dagger}}(x)\psi (0)\rangle\) of the complex fermion field \(\psi (x)\). We find that both truncated GGEs are able to recover \(G(x)\), but for a given number of charges the semi-local version performs better.

MSC:

82B20 Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs arising in equilibrium statistical mechanics

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