Jürgen Berges
Heidelberg University
Particle physicsEffective actionQuantum field theoryPhysicsStatistical physicsThermalisationQuantum simulatorGauge theoryField (physics)Bose gasQuark–gluon plasmaQuantum electrodynamicsTheoretical physicsLattice field theoryFermionQuantum mechanicsClassical mechanicsNon-equilibrium thermodynamicsQuantumScaling
86Publications
30H-index
2,186Citations
Publications 79
Newest
#1Daniel SpitzH-Index: 2
#2Jürgen BergesH-Index: 30
Last. Anna WienhardH-Index: 15
view all 4 authors...
Source
Last. Jürgen BergesH-Index: 30
view all 5 authors...
Recently, two scenarios have been proposed to resolve the discrepancy between photon yield and the flow coefficients measured in nuclear collisions at RHIC and the LHC. In the first, additional photons are produced from the early pre-equilibrium stage computed from the "bottom-up" thermalization scenario. In the second, the thermal rates are enhanced close to the pseudo-critical temperature T_c \sim155MeV using a phenomenological ansatz. We investigate the measurement of Hanbury Brown-Twiss (...
Source
#1Gregor Fauth (Heidelberg University)H-Index: 1
#2Jürgen Berges (Heidelberg University)H-Index: 30
Last. Antonino Di Piazza (MPG: Max Planck Society)H-Index: 16
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Starting from nonequilibrium quantum field theory on a closed time path, we derive kinetic equations for the strong-field regime of quantum electrodynamics (QED) using a systematic expansion in the gauge coupling e The strong field regime is characterized by a large photon field of order \mathcal{O}(1/e) which is relevant for the description of, e.g., intense laser fields, the initial stages of off-central heavy ion collisions, and condensed matter systems with net fermion number. The stro...
Source
#1Jürgen Berges (Heidelberg University)H-Index: 30
#2Michal P. Heller (Albert Einstein Institution)H-Index: 32
Last. Raju Venugopalan (BNL: Brookhaven National Laboratory)H-Index: 85
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Source
#1Aleksandr Chatrchyan (Heidelberg University)H-Index: 3
#2Kevin T. Geier (Heidelberg University)H-Index: 3
Last. Philipp Hauke (Heidelberg University)H-Index: 35
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Cosmological reheating describes the transition of the postinflationary universe to a hot and thermal state. In order to shed light on the underlying dynamics of this process, we propose to quantum-simulate the reheating-like dynamics of a generic cosmological single-field model in an ultracold Bose gas. In our setup, the excitations on top of an atomic Bose-Einstein condensate play the role of the particles produced by the decaying inflaton field after inflation. Expanding spacetime as well as ...
Source
#1Zhao-Yu ZhouH-Index: 2
#2Guo-Xian SuH-Index: 3
Last. Jian-Wei PanH-Index: 113
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Gauge theories form the foundation of modern physics, with applications ranging from elementary particle physics and early-universe cosmology to condensed matter systems. We demonstrate emergent irreversible behavior, such as the approach to thermal equilibrium, by quantum simulating the fundamental unitary dynamics of a U(1) symmetric gauge field theory. While this is in general beyond the capabilities of classical computers, it is made possible through the experimental implementation of a larg...
#1Lasse GresistaH-Index: 1
#2Torsten V. ZacheH-Index: 7
Last. Jürgen BergesH-Index: 30
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We perform a dynamical finite-size scaling analysis of a nonequilibrium Bose gas which is confined in the transverse plane. Varying the transverse size, we establish a dimensional crossover for universal scaling properties far from equilibrium. Our results suggest that some aspects of the dynamical universal behavior of anisotropic systems can be classified in terms of fractional spatial dimensions. We discuss our findings in view of recent experimental results with quasi one-dimensional setups ...
#1Daniel Spitz (Heidelberg University)H-Index: 2
#2Jürgen BergesH-Index: 30
Last. Anna WienhardH-Index: 15
view all 4 authors...
Inspired by topological data analysis techniques, we introduce persistent homology observables and apply them in a geometric analysis of the dynamics of quantum field theories. As a prototype application, we consider simulated data of a two-dimensional Bose gas far-from-equilibrium. We discover a continuous spectrum of dynamical scaling exponents, which provides a refined classification of nonequilibrium universal phenomena. A possible explanation of the underlying processes is provided in terms...
#1Maximilian Prüfer (Heidelberg University)H-Index: 8
#2Torsten V. Zache (Heidelberg University)H-Index: 7
Last. Markus K. Oberthaler (Heidelberg University)H-Index: 59
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Source
#1Robert OttH-Index: 3
#2Torsten V. ZacheH-Index: 7
Last. Jürgen BergesH-Index: 30
view all 4 authors...
We propose a scalable analog quantum simulator for quantum electrodynamics (QED) in two spatial dimensions. The setup for the U(1) lattice gauge field theory employs inter-species spin-changing collisions in an ultra-cold atomic mixture trapped in an optical lattice. Building on the previous one-dimensional implementation scheme of Ref. [1] we engineer spatial plaquette terms for magnetic fields, thus solving a major obstacle towards experimental realizations of realistic gauge theories in highe...
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