Virial expansion and TBA in O(N) sigma models

Details Virial expansion and TBA in O(N) sigma models Virial expansion and TBA in O(N) sigma models

2001-08-10

arxiv.org/abs/hep-th/0108071v1

Phys.Lett. B523 (2001) 211-220

Physics

High Energy Physics

High Energy Physics - Theory

14 pages, LaTeX

Scientific paper

10.1016/S0370-2693(01)01307-7

We study the free energy of the 1+1 dimensional O(N) nonlinear sigma-models
for even N using the TBA equations proposed recently. We give explicit formulae
for the constant solution of the TBA equations (Y-system) and calculate the
first two virial coefficients. The free energy is also compared to the leading
large N result.

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