The pressure of QED from the two-loop 2PI effective action

Authors :: Borsanyi, Szabolcs
Reinosa, Urko
Borsanyi, Sz.
Theoretische Teilchenphysik
Bergische Universität Wuppertal
Service de Physique Théorique (SPhT)
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Source :: Modern Physics Letters B, Modern Physics Letters B, 2008, 661 (2-3), pp.88-94. ⟨10.1016/j.physletb.2008.02.011⟩
Publication Year :: 2008
Publisher :: Elsevier BV, 2008.
Abstract: We compute the pressure of hot quantum electrodynamics from the two-loop truncation of the 2PI effective action. Since the 2PI resummation guarantees gauge-fixing independence only up to the order of the truncation, our result for the pressure presents a gauge dependent contribution of O(e^4). We numerically characterize the credibility of this gauge-dependent calculation and find that the uncertainty due to gauge parameter dependence is under control for xi<br />15 latex pages with 3 figures