Turbulence and Bose Condensation - Institut für Theoretische ...

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Prethermalization Christof Wetterich Inst. Theoretical Physics, University of Heidelberg, Philosophenweg 16, 69120, Heidelberg, Germany Turbulence in the Early Universe Igor Tkachev INR, Moscow, Russia Universe reheating after Inflation will be discussed, with the emphasis on Turbulence and associated phenomena. 16
A Superfluid Universe Kerson Huang MIT/Institute of Advanced Studes, Nanyang Technological University, 60 Nanyang View #02-18, Nanyang, USA/Singapore 639673 Particle physics tells us that the vacuum is a dynamic medium possibly filled with complex scalar fields. Condensed matter physics tells us that a complex scalar field, whatever its origin, serves as order parameter for superfluidity. Considering the implication of all this on a cosmic scale, one comes to the conclusion that the universe may be a superfluid. We describe the emergence of such a superfluidity during the big bang, in terms of a mathematical initial-value problem based on Einstein’s equation. This is made possible by using the Halpern-Huang scalar potential, which is asymptotically free. The solution shows that the universe expands with accelerating rate, with an equivalent cosmological constant that decays in time according to a power law, and this gives dark energy without the usual fine-tuning problem. The dynamics of quantized vorticity allows the growth and decay of a superfluid vortex tangle (quantum turbulence), in which vortex reconnections can create all the matter present in the universe. The inflation era is the lifetime of quantum turbulence, according to this model. As for the present universe, the energy density of the superfluid is dark energy, and deviation of the superfluid from uniformity, due to the prescence of galaxies, is observed as dark matter, through gravitational lensing. Vortices surviving from the Planck era had core diameters growing from Planck length to the order of 108 light years. These giant vortex cores could explain the galactic voids now observed. Vortex reconnections generate two opposite jets of energy, which could explain cosmic jets. A collapsing rotating black hole in the superfluid would be covered with "hair" in the form of vortex filaments, which could explain the "non-thermal filaments" seen near the center of the Milky Way. 17
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Turbulence and Bose Condensation - Institut für Theoretische ...

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