Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics I

Q 31.3: Poster

Dienstag, 7. März 2017, 17:00–19:00, P OG1+2

Universal many-body scattering matrix for strong sound-wave turbulence in a dilute Bose gas — •Isara Chantesana^1,2,3 and Thomas Gasenzer^1,3 — ¹Kirchhoff-Institut für Physik, Ruprect-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany — ²Institut für Theoretische Physik, Ruprect-Karls-Universität Heidelberg, Philosophenweg 16, 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. The key ingredient of our approach is a universal many-body scattering matrix in the infrared limit, independent of the details of the microscopic interactions, which is derived by a resummation of 2PI diagrams. The Boltzmann scattering integral is analyzed in order to find the scaling at the fixed points which correspond to scaling exponents of sound wave turbulence. The dynamics obtained depends on approximate conservation laws in momentum space, the scaling behaviour of the scattering matrix and the dimensionality.