Universal scaling of unequal-time correlation functions in ultracold Bose gases far from equilibrium

Abstract

We explore the far-from-equilibrium dynamics of Bose gases in a universal regime associated to nonthermal fixed points. While previous investigations concentrated on scaling functions and exponents describing equal-time correlations, we compute the additional scaling functions and dynamic exponent $z$ characterizing the frequency dependence or dispersion from unequal-time correlations. This allows us to compare the characteristic condensation and correlation times from a finite-size scaling analysis depending on the system's volume.

arXiv comment11 pages, 8 figures

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• Large-N kinetic theory for highly occupied systems
• Low-energy effective theory of non-thermal fixed points in a multicomponent Bose gas
• Breaking the Fluctuation-Dissipation Relation by Universal Transport Processes
• Far-from-equilibrium universality in the two-dimensional Heisenberg model
• Finding self-similar behavior in quantum many-body dynamics via persistent homology
• Gauge-invariant condensation in the nonequilibrium quark-gluon plasma
• Unraveling the nature of universal dynamics in $O(N)$ theories
• Universal dynamics and non-thermal fixed points in quantum fluids far from equilibrium
• Crossover in the dynamical critical exponent of a quenched two-dimensional Bose gas
• Universal dynamics of rogue waves in a quenched spinor Bose condensate
• Anomalous scaling at non-thermal fixed points of the sine-Gordon model
• Inflationary preheating dynamics with ultracold atoms
• Detecting defect dynamics in relativistic field theories far from equilibrium using topological data analysis
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• Anomalous non-thermal fixed point in a quasi-two-dimensional dipolar Bose gas