A note on the 2D NLSM free energy
classification
✦ hep-th
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nlsmnoteagreementansatzasymptoticsbethechemicalcomputation
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This note contains the perturbative computation of the 2D non-linear sigma model (NLSM) energy-density in a chemical potential $h$, at the fourth order in the coupling constant expansion. The result is in fully agreement with the $h\rightarrow \infty$ asymptotics extracted from the thermodynamical Bethe ansatz (TBA).
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