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Field theory near the critical temperature

J. Berges
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Abstract

Field theory at nonvanishing temperature beyond perturbation theory is discussed for the $N$-component $O(N)$-symmetric scalar theory. We compute the effective potential directly in three dimensions using an exact evolution equation for an effective action with an infrared cutoff. A suitable truncation is solved numerically. We obtain a detailed quantitative picture of the scaling form of the equation of state in the vicinity of the critical temperature of a second order phase transition.

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J. Berges. 1996-10-14. Field theory near the critical temperature. https://arxiv.org/abs/hep-ph/9610353

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