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Publications Influence

Introduction to Nonequilibrium Quantum Field Theory

- J. Berges
- Physics
- 20 September 2004

There has been substantial progress in recent years in the quantitative understanding of the nonequilibrium time evolution of quantum fields. Important topical applications, in particular in high… Expand

297 12- PDF

Controlled nonperturbative dynamics of quantum fields out-of-equilibrium

- J. Berges
- Physics
- 29 May 2001

Abstract We compute the nonequilibrium real-time evolution of an O ( N )-symmetric scalar quantum field theory from a systematic 1/ N expansion of the 2PI effective action to next-to-leading order,… Expand

168 7- PDF

Thermalization of quantum fields from time-reversal invariant evolution equations

Abstract We study the time evolution of correlation functions in closed quantum systems for nonequilibrium ensembles of initial conditions. For a scalar quantum field theory we show that generic… Expand

126 5- PDF

Nonthermal fixed points: effective weak coupling for strongly correlated systems far from equilibrium.

- J. Berges, A. Rothkopf, J. Schmidt
- Physics, Medicine
- Physical review letters
- 3 March 2008

Strongly correlated systems far from equilibrium can exhibit scaling solutions with a dynamically generated weak coupling. We show this by investigating isolated systems described by relativistic… Expand

128 4- PDF

Experimental characterization of a quantum many-body system via higher-order correlations

- T. Schweigler, V. Kasper, +7 authors J. Schmiedmayer
- Physics, Medicine
- Nature
- 18 May 2017

Quantum systems can be characterized by their correlations. Higher-order (larger than second order) correlations, and the ways in which they can be decomposed into correlations of lower order,… Expand

91 3

Nonequilibrium time evolution of the spectral function in quantum field theory

Transport or kinetic equations are often derived assuming a quasiparticle ~on-shell! representation of the spectral function. We investigate this assumption using a three-loop approximation of the… Expand

93 3- PDF

Dynamic critical phenomena from spectral functions on the lattice

- J. Berges, S. Schlichting, D. Sexty
- Physics
- 16 December 2009

Abstract We investigate spectral functions in the vicinity of the critical temperature of a second-order phase transition. Since critical phenomena in quantum field theories are governed by classical… Expand

15 3- PDF

Strong versus weak wave-turbulence in relativistic field theory

Nonthermal scaling phenomena can exhibit a characteristic dependence on the dimensionality d of space. For d=3 and 4 we simulate a relativistic scalar field theory on a lattice and compute turbulent… Expand

47 2- PDF

Implementing quantum electrodynamics with ultracold atomic systems

- V. Kasper, F. Hebenstreit, F. Jendrzejewski, M. Oberthaler, J. Berges
- Physics
- 11 August 2016

We discuss the experimental engineering of model systems for the description of QED in one spatial dimension via a mixture of bosonic $^{23}$Na and fermionic $^6$Li atoms. The local gauge symmetry is… Expand

41 2- PDF

Matter Wave Turbulence: Beyond Kinetic Scaling

- C. Scheppach, J. Berges, T. Gasenzer
- Physics
- 21 December 2009

Turbulent scaling phenomena are studied in an ultracold Bose gas away from thermal equilibrium. Fixed points of the dynamical evolution are characterized in terms of universal scaling exponents of… Expand

43 2- PDF

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