Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 65: Schwerionenkollisionen und QCD Phasen IX
HK 65.5: Vortrag
Freitag, 25. März 2011, 15:30–15:45, HS2
Effects of a temperature-dependent shear viscosity-to-entropy density ratio on elliptic flow in heavy-ion collisions at RHIC and LHC — Gabriel Denicol1,2, Pasi Huovinen1, Etele Molnar3, •Harri Niemi2, and Dirk Rischke1 — 1Institute für Theoretische Physik, Johann Wolfgang Goethe-Universität, Max-von-Laue-Str. 1, D-60438 Frankfurt am Main, Germany — 2Frankfurt Institute for Advanced Studies, Ruth-Moufang-Str. 1, D-60438 Frankfurt am Main, Germany — 3MTA-KFKI, Research Institute of Particle and Nuclear Physics, H-1525 Budapest, P.O.Box 49, Hungary
We investigate, by using relativistic fluid dynamics, the effects of a temperature-dependent shear viscosity-to-entropy density ratio η/s on transverse momentum spectra and elliptic flow of hadrons in ultrarelativistic heavy-ion collisions.
We show that the elliptic flow coefficient in √sNN = 200 GeV Au+Au collisions (i.e., at the Relativistic Heavy Ion Collider – RHIC) are insensitive to the value of η/s in the high-temperature quark-gluon plasma (QGP), as long as it has the same minimum value near the QCD phase transition. On the other hand, the elliptic flow is very sensitive to the η/s value of the hadron gas.
We find that the sensitivity of the elliptic flow to the high-temperature value of η/s increases with increasing multiplicity and simultaneously the sensitivity to the hadronic viscosity decreases. This makes Pb+Pb collisions at the Large Hadron Collider (LHC) more suitable to extract transport properties of QCD matter at high temperature.