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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Heavy Ion Collision and QCD Phases II

HK 3.4: Talk

Monday, March 14, 2016, 15:00–15:15, S1/01 A4

The effect of longitudinal fluctuations in (3+1)D viscous hydrodynamics — •Long-Gang Pang¹, Hannah Petersen^1,2,3, Pasi Huovinen⁶, Xin-Nian Wang^4,5, and Yuri Karpenko¹ — ¹FIAS, Frankfurt, Germany — ²ITP, Goethe University, Frankfurt, Germany — ³GSI, Darmstadt, Germany — ⁴CCNU, Wuhan, China — ⁵LBNL, Berkeley, USA — ⁶ITP, University of Wroclaw, Poland

The energy density fluctuations of the quark gluon plasma (QGP) in the transverse plane are studied in detail and found to be important to explain the high order harmonic flow v_n at RHIC and LHC. However, the energy density fluctuations along longitudinal direction (space-time rapidity η_s) have not been fully investigated yet, even though they should exist as well. Previous studies show that the longitudinal fluctuations strongly depend on the initial entropy deposition mechanisms. In this work AMPT initial conditions are used where HIJING introduces longitudinal fluctuations originating from the asymmetry between forward and backward going participants, string length fluctuations and finite number of partons at different collision energies. The longitudinal fluctuations have been found to be responsible for the de-correlation of anisotropic flow and twist of event planes along rapidity. We study the effect of longitudinal fluctuations on the QGP expansion in both transverse and longitudinal direction within CLVisc, a (3+1)D viscous hydrodynamic code parallelized on GPU using OpenCL, to check whether the anisotropic flow is affected by longitudinal fluctuations and to determine appropriate shear viscosity over entropy density coefficients η/s in comparison with experiments at RHIC and LHC.