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TT: Fachverband Tiefe Temperaturen

TT 63: Quantum Dynamics and Many-body Systems – Poster (joint session DY/TT)

TT 63.2: Poster

Mittwoch, 11. März 2026, 15:00–18:00, P5

Non-Perturbative Out-Of-Equilibrium Dynamics with Initial Four-Point-Correlations — Jürgen Berges, Louis Jussios, and •Cosima Schmitt — ITP Heidelberg

We investigate how initial correlations affect the equilibration dynamics of closed systems in quantum field theory. For interacting scalar fields with N components, we derive nonequilibrium evolution equations from a self-consistent large-N expansion to next-to-leading-order. By going beyond conventional Gaussian initial conditions, we point out the role of initial four-point correlations for the propagator evolution at early times and in the late-time approach to thermal equilibrium.

Keywords: Equilibration; Nonequilibrium; Initial Correlations; Quantum Field Theory; Large-N-Expansion