2005/11/01 by Anders Tranberg, Tranberg, Anders
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Physics of Superconductivity and Magnetism #Quantum many-body systems #Theoretical and Computational Physics #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0511009
5 pages, 4 figures. To appear in the proceedings of XQCD, Swansea, 2-5 August 2005
arxiv created 2005/11/01 · openalex publication_date 2005/11/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Recently, out-of-equilibrium field theory has been studied using approximations based on truncations of the 2PI effective action. Although results are promising, the convergence of subsequent orders of the approximation is difficult to get a handle on, mainly because, generically, only the lowest non-trivial order is currently numerically tractable. We study one specific case, the broken phase of the phi4 model, where the existence of an effective three point vertex makes it possible to compare a lowest and next-to-lowest non-trivial order.