Ref HAL: hal-01177137_v1
PMID 26849585
Ref Arxiv: 1507.03508
DOI: 10.1103/PhysRevLett.116.031601
WoS: 000368523200003
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
11 Citations
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.

Commentaires: 5 pages, 1 figure