Broken phase effective potential in the two-loopΦ-derivable approximation and nature of the phase transition in a scalar theory

Gergely Markó1, Urko Reinosa2, Zs. Szép3
1Eötvös Lorand University.
2Centre de physique théorique, École polytechnique, CNRS, 91128 Palaiseau cedex, France
3Statistical and Biological Physics Research Group of the Hungarian Academy of Sciences, H-1117 Budapest, Hungary

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