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Quantum turbulence in an atomic trapped superfluid: the observation of a power law in the kinetic energy spectrum Vanderlei S. Bagnato IFSC, Univeristy of Sao Paulo, Av. Trabalhador Sao Carlense, 400, Sao Carlos - SP, Brazil We analyze the spectrum of kinetic energy of a turbulent sample of trapped Rb atoms forming a quantum fluid. Turbulence is produced by an oscillatory field as described in previous work. The analysis is performed to identify the inertial range of momentum and associated with the appearance of the power law dependence of the type k −δ . We found that for a turbulent cloud of atomic superfluid, E(k) ∼ k −3 . Comparison with the Kolmogorov −5/3 power law is performed. Details of the experiment are presented. Finally, arguments are discussed concerning the importance of the phenomenon of quantum turbulence and the existence of scaling law for the understanding of the phenomenon of turbulence in general. Support from FAPESP, CNPq and CAPES Figure 1: figure showing the momentum distribution and the presence of the power law behavior in n(k) 28
Nonthermal fixed points and superfluid turbulence Boris Nowak Institut für Theoretische Physik , Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany Many-body systems far away from thermal equilibrium can show a much wider range of characteristics than equilibrium systems. Among the wealth of possible non-equilibrium many- body configurations most interesting candidates are those which show universal behavior. We present a selection of such phenomena in ultracold Bose gases, characterized by specific power-laws in space and time. These are closely related to the presence and turbulent dynamics of (quasi-)topological defects in the Bose field, which generically appear far from equilibrium. Examples include interaction quenches in 1D, condensate perturbations in 2D and rapid evaporative cooling in 3D. Relaxation in an Isolated Quantum System Jörg Schmiedmayer Vienna Center for Quantum Science and Technology, TU-Wien, Stadionallee 2, Wien, Austria 29
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