Speaker
Description
Understanding QCD at high temperatures is essential for describing strongly interacting matter and the evolution of the early Universe. I will present a non-perturbative determination of the Equation of State of QCD with three massless quark flavours, covering temperatures from 3 GeV up to the electroweak scale and smoothly connecting to the low-temperature regime. The comparison with perturbation theory shows that higher-order terms, including non-perturbative contributions, remain relevant even at very high temperatures.
This study relies on the formulation of QCD in a moving reference frame which also provides useful Ward identities for the non-perturbative renormalization of the energy–momentum tensor on the lattice. I will discuss a recent precise determination of the corresponding renormalization constants and their relevance in lattice QCD at finite temperature.