Far-from-equilibrium quantum many-body dynamics

• Verfasst von: Gasenzer, Thomas [VerfasserIn]
• Verfasst von: Keßler, Stefan [VerfasserIn]
• Verfasst von: Pawlowski, Jan M. [VerfasserIn]
• Titel: Far-from-equilibrium quantum many-body dynamics
• Verf.angabe: Thomas Gasenzer, Stefan Keßler, Jan M. Pawlowski
• Umfang: 2 S.
• Fussnoten: Gesehen am 01.12.2017
• Titel Quelle: Enthalten in: The European physical journal / C
• Jahr Quelle: 2010
• Band/Heft Quelle: 70(2010), 1-2, S. 423-443
• ISSN Quelle: 1434-6052
• DOI: doi:10.1140/epjc/s10052-010-1430-3
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565932641

Abstract

A theory of real-time quantum many-body dynamics is evaluated in detail. It is based on a generating functional of correlation functions where the closed time contour extends only to a given time. Expanding the contour from this time to a later time leads to a dynamic flow of the generating functional. This flow describes the dynamics of the system and has an explicit causal structure. In the present work it is evaluated within a vertex expansion of the effective action leading to time-evolution equations for Green functions. These equations are applicable for strongly interacting systems as well as for studying the late-time behavior of non-equilibrium time evolution. For the specific case of a bosonic NN\mathcal{N}-component φ4-theory with contact interactions an s-channel truncation is identified to yield equations identical to those derived from the 2PI effective action in next-to-leading order of a 1/N1/N1/\mathcal{N} expansion. The presented approach allows to directlyobtain non-perturbative dynamic equations beyond the widely used 2PI approximations.