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Thermodynamics of the O(N) Nonlinear Sigma Model in 1+1 Dimensions

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arxiv hep-ph/0309091 v2 pith:WHEM6DZQ submitted 2003-09-09 hep-ph

Thermodynamics of the O(N) Nonlinear Sigma Model in 1+1 Dimensions

classification hep-ph
keywords dimensionseffectivefiniteminimummodelnonlinearorderpotential
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The thermodynamics of the O(N) nonlinear sigma model in 1+1 dimensions is studied. We calculate the pressure to next-to-leading order in the 1/N expansion and show that at this order, only the minimum of the effective potential can be rendered finite by temperature-independent renormalization. To obtain a finite effective potential away from the minimum requires an arbitrary choice of prescription, which implies that the temperature dependence is ambiguous. We show that the problem is linked to thermal infrared renormalons.

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