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HK: Fachverband Physik der Hadronen und Kerne
HK 26: Schwerionenkollisionen und QCD Phasen
HK 26.4: Talk
Tuesday, March 18, 2014, 17:30–17:45, HZ 6
The second order hydrodynamic transport coefficient κ for the gluon plasma from the lattice — •Christian Schäfer and Owe Philipsen — Goethe-Universität, Frankfurt am Main, Germany
The quark gluon plasma produced in heavy ion collisions behaves like an almost ideal fluid described by viscous hydrodynamics with a number of transport coefficients. These are difficult to calculate in lattice QCD because of their real time nature. The second order coefficient κ is related to a Euclidean correlator of the energy-momentum tensor at vanishing frequency and low momentum. This allows for a lattice determination without maximum entropy methods or modelling, but the required lattice sizes represent a formidable challenge. We calculate κ in leading order lattice perturbation theory and simulations on 1203× 6,8 lattices with a<0.1 fm. In the temperature range 2Tc−10Tc we find κ=0.36(15)T2. Remarkably, this result is smaller than predicted by the AdS/CFT correspondence, but consistent with perturbation theory.