Renormalization group optimized $\lambda {\varphi }^4$ pressure at next-to-next-to-leading order

Abstract

We investigate the renormalization group optimized perturbation theory (RGOPT) at the next-to-next-to-leading order (NNLO) for the thermal scalar field theory. From comparing three thus available successive RGOPT orders we illustrate the efficient resummation and very good apparent convergence properties of the method. In particular the remnant renormalization scale dependence of thermodynamical quantities is drastically improved as compared to both standard perturbative expansions and other related resummation methods, such as the screened perturbation theory. Our present results thus constitute a useful first NNLO illustration in view of NNLO applications of this approach to the more involved thermal QCD.

18 pages, 8 figures

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Cited by in corpus (4)

• Non-strange quark stars within resummed QCD
• Comparing strange and non-strange quark stars within resummed QCD at NLO
• Cold Quark Matter: Renormalization Group Improvement at next-to-next-to leading order
• Scale dependence improvement of the quartic scalar field thermal effective potential in the optimized perturbation theory