Massive $ϕ^4$ Model at Finite Temperature -- Resummayion Procedure la RG Improvement --
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In this paper the phase structure of the massive $λϕ^4$ model at finite temperature ($T \neq 0$) is investigated by applying a resummation method inspired by the renormalization-group (RG) improvement to the one-loop effective potential. The resummation method a la RG-improvement is shown to work quite succesfully by resumming up systematically large correction-terms of $O(λT/μ)$ and of $O(λ(T/μ)^2)$. The temperature-dependent phase transition of the model is shown to proceed through the second order transition. The critical exponents are determined analytically and are compared with those in other analyses.
6 pages, Latex file with sprocl.sty and epsf.sty, including 1 figure (eps.file). Talk presented at 1998 YITP-Workshop on QCD and Hadron Physics. To be published in Proceedings
6 pages, Latex file with sprocl.sty and epsf.sty, including 1 figure (eps.file). Talk presented at 1998 YITP-Workshop on QCD and Hadron Physics. To be published in Proceedings