Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 36: Quantum Gases: Bosons V
Q 36.5: Vortrag
Mittwoch, 25. März 2015, 12:00–12:15, P/H2
Strong-wave-turbulence character of non-thermal fixed points in Bose gases — •Isara Chantesana1,2,3, Asier Piniero Orioli1, Jürgen Berges1, and Thomas Gasenzer1,2,3 — 1Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany — 2Kirchhoff Institute for Physics, INF 227, 69120 Heidelberg, Germany — 3ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
Far-from equilibrium dynamics of a dilute Bose gas is studied by means of the two-particle irreducible effective action formalism. We investigate the properties of non-thermal fixed points predicted previously, which are related to non-perturbative strong wave turbulence solutions of the many-body dynamic equations. While they can be formulated in the framework of scaling theory, these fixed points are closely connected with strong non-linear excitations of the gas, including those of (quasi-)topological nature. They are readily accessible to experiment while their relevance reaches far beyond the closer realm of cold gases. A recent analysis of the infrared renormalisation of vertices is of strong interest for the further development of a non-perturbative renormalisation-group description of non-thermal fixed points.