Effective Potential at Finite Temperature: RG improvement vs. High temperature expansion
Hisao Nakkagawa, Hiroshi Yokota
Abstract
We have applied the recently proposed renormalization group improvement procedure of the finite temperature effective potential, and have investigated extensively the phase structure of the massive scalar ϕ4 model, showing that the ϕ4 model has a rich 3-phase structure at T ≠ 0, two of them are not seen in the ordinary perturbative analysis. Temperature dependent phase transition in this model is shown to be strongly the first order.
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