München 2009 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 25: Quantenfeldtheorie
T 25.1: Vortrag
Freitag, 13. März 2009, 14:00–14:15, M010
Quantum fields far from equilibrium: instabilities and non-thermal fixed points — Jürgen Berges1, •Jens Pruschke1, and Alexander Rothkopf2 — 1Institute for Nuclear Physics, Darmstadt University of Technology, Schlossgartenstr. 9, 64285 Darmstadt, Germany — 2Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
Quantum field theoretical studies of bosonic systems far from equilibrium show a slow evolution after an instability took place. This prevents a fast thermalization. Scattering between bosons and fermions might lead to an acceleration of the evolution towards equilibrium.
We investigate the interaction of fermionic and bosonic quantum fields out of equilibrium in a Yukawa type model. A spinodal/tachyonic instability in the bosonic sector induces an unstable evolution in the fermionic sector too. In a certain parameter regime the influence of the fermionic fields on the boson sector is negligible. Instead of an acceleration of the evolution the emergence of non-thermal fixed points is observed. The results have important consequences, for example in reheating the universe after inflation.