Functional renormalisation group approach to far-from-equilibrium quantum field dynamics

• Verfasst von: Gasenzer, Thomas [VerfasserIn]
• Verfasst von: Pawlowski, Jan M. [VerfasserIn]
• Titel: Functional renormalisation group approach to far-from-equilibrium quantum field dynamics
• Verf.angabe: Thomas Gasenzer and Jan M. Pawlowski
• Fussnoten: Gesehen am 06.12.2017
• Titel Quelle: Enthalten in: De.arxiv.org
• Jahr Quelle: 2008
• Band/Heft Quelle: (2008) Artikel-Nummer 0710.4627, 8 Seiten
• DOI: doi:10.1016/j.physletb.2008.10.049
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1566075408

Abstract

Dynamic equations for quantum fields far from equilibrium are derived by use of functional renormalisation group techniques. The obtained equations are non-perturbative and lead substantially beyond mean-field and quantum Boltzmann type approximations. The approach is based on a regularised version of the generating functional for correlation functions where times greater than a chosen cutoff time are suppressed. As a central result, a time evolution equation for the non-equilibrium effective action is derived, and the time-evolution of the Green functions is computed within a vertex expansion. It is shown that this agrees with the dynamics derived from the 1/N-expansion of the two-particle irreducible effective action.