Recent progress in hard-thermal-loop QCD thermodynamics and collective excitations

Abstract

I review recent developments in QCD thermodynamics and collective excitations from the hard-thermal-loop effective theory. I begin by motivating the discussion with open questions from heavy-ion collisions. I then discuss a finite-temperature and -density calculation of QCD thermodynamics at NNLO from the hard-thermal-loop perturbation theory. Finally I discuss a recent exploration of generalizing the hard-thermal-loop framework to the (chromo)magnetic scale $g^{2}T$, from which a novel massless mode is uncovered.

Comments: 18 pages, 7 figures; Invited review for International Journal of Modern Physics A; v2, references updated and typos corrected, published version