|Renormalization group improved pressure for hot and dense quark matter |
Auteur(s): Kneur J.-L., Pinto Marcus Benghi, Restrepo Tulio E.
Ref HAL: hal-03129450_v1
Ref Arxiv: 2101.08240
Ref INSPIRE: 1842071
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
We apply the renormalization group optimized perturbation theory (RGOPT) to evaluate the quark contribution to the QCD pressure at finite temperatures and baryonic densities, at next-to-leading order (NLO). Our results are compared to NLO and state-of-the-art higher orders of standard perturbative QCD (pQCD) and hard thermal loop perturbation theory (HTLpt). The RGOPT provides an all order resummed pressure in a well-defined approximation, exhibiting a drastically better remnant renormalization scale dependence than pQCD, thanks to built-in renormalization group invariance consistency. At NLO, upon simply adding to the RGOPT-resummed quark contributions the purely perturbative NLO glue contribution, our results show a remarkable agreement with ab initio lattice simulation data for temperatures , with a remnant scale dependence drastically reduced as compared to HTLpt.