Stuttgart 2012 – wissenschaftliches Programm
Q 1.8: Vortrag
Montag, 12. März 2012, 12:15–12:30, V53.01
Nonthermal fixed points, vortex statistics and superfluid turbulence — •Boris Nowak1,2, Jan Schole1,2, Denes Sexty1,2, and Thomas Gasenzer1,2 — 1Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
Turbulent dynamics of an ultracold Bose gas, in two and three spatial dimensions, is analysed by means of statistical simulations using the classical field equation. A special focus is set on the infrared regime of large-scale excitations following universal power-law distributions distinctly different from those of commonly known weak wave-turbulence phenomena. The infrared power laws can be understood from the statistics of vortex excitations as well as from an analytic field-theoretic approach based on the 2PI effective action. The results shed light on fundamental aspects of superfluid turbulence and have strong potential implications for related phenomena, e.g., in early-universe inflation or quark-gluon plasma dynamics.