- Renormalization group improved pressure for hot and dense quark matter doi link

Auteur(s): Kneur J.-L., Pinto Marcus Benghi, Restrepo Tulio E.

(Article) Publié: -Phys.rev.d, vol. 104 p.034003 (2021)
Texte intégral en Openaccess : arxiv

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DOI: 10.1103/PhysRevD.104.034003
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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 0.25T1GeV, with a remnant scale dependence drastically reduced as compared to HTLpt.