Rostock 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 21: Quantum Gases (Bosons) II
Q 21.5: Vortrag
Montag, 11. März 2019, 17:15–17:30, S HS 037 Informatik
Universal spectral and statistical properties of quantum fields far from equilibrium — •Linda Shen1,2 and Jürgen Berges1 — 1Institut für Theoretische Physik, Philosophenweg 16, 69120 Heidelberg, Germany — 2Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
We investigate the universal dynamics close to a non-thermal fixed point where the non-equilibrium time-evolution is characterized by self-similar scaling solutions. Using 2PI effective action methods, the unequal-time correlation functions including statistical and spectral components are computed within a relativistic scalar quantum field theory.
We extract scaling exponents from the self-similar particle transport towards lower momenta, where we find exponents in agreement to previous analyzes using classical-statistical methods.
Here, we also study unequal-time correlation functions which contain information about the excitation spectrum of the theory. We find that the infrared momentum regime cannot be described in terms of the relativistic quasi-particle degrees of freedom. Furthermore, the fluctuation-dissipation theorem is broken for low momenta.