Perturbative computation of 2D NLSM energy-density to fourth order agrees with TBA large-h asymptotics.
A thermal form factor series for the longitudinal two-point function of the Heisenberg Ising chain in the antiferromagnetic massive regime
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A note on the 2D NLSM free energy
Perturbative computation of 2D NLSM energy-density to fourth order agrees with TBA large-h asymptotics.