Towards far-from-equilibrium quantum field dynamics: a functional renormalisation-group approach
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...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
30 October 2008
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| In: |
Physics letters
Year: 2008, Jahrgang: 670, Heft: 2, Pages: 135-140 |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2008.10.049 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1016/j.physletb.2008.10.049 Verlag, kostenfrei, Volltext: http://www.sciencedirect.com/science/article/pii/S0370269308013130 
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| Verfasserangaben: | Thomas Gasenzer, Jan M. Pawlowski |
| Zusammenfassung: | 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. |
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| Beschreibung: | Gesehen am 06.12.2017 |
| Beschreibung: | Online Resource |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2008.10.049 |