Scale-Invariant Resummed Perturbation at Finite Temperatures. - Laboratoire Charles Coulomb (L2C) Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2016

Scale-Invariant Resummed Perturbation at Finite Temperatures.

Résumé

We use the scalar model with quartic interaction to illustrate how a nonperturbative variational technique combined with renormalization group (RG) properties efficiently resums perturbative expansions in thermal field theories. The resulting convergence and scale dependence of optimized thermodynamical quantities, here illustrated up to two-loop order, are drastically improved as compared to standard perturbative expansions, as well as to other related methods such as the screened perturbation or (resummed) hard-thermal-loop perturbation, that miss RG invariance (as we explain). Being very general and easy to implement, our method is a potential analytical alternative to dealing with the phase transitions of field theories such as thermal QCD.
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Dates et versions

hal-01177137 , version 1 (03-06-2021)

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Jean-Loïc Kneur, Marcus Pinto. Scale-Invariant Resummed Perturbation at Finite Temperatures.. Physical Review Letters, 2016, 116 (3), pp.031601. ⟨10.1103/PhysRevLett.116.031601⟩. ⟨hal-01177137⟩
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