Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-03-04
Phys.Rev.C82:054905,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
v4: 29 pages, 12 figures, minor changes. Final version as published in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.82.054905
We apply divergence-type theory (DTT) dissipative hydrodynamics to study the 2+1 space-time evolution of the fireball created in Au+Au relativistic heavy-ion collisions at $\sqrt{s_{NN}}=$200 GeV. DTTs are exact hydrodynamic theories that do no rely on velocity gradient expansions and therefore go beyond second-order theories. We numerically solve the equations of motion of the DTT for Glauber initial conditions and compare the results with those of second-order theory based on conformal invariants (BRSS) and with data. We find that the charged-hadron minumum-bias elliptic flow reaches its maximum value at lower $p_T$ in the DTT, and that the DTT allows for a value of $\eta/s$ slightly larger than that of the BRSS. Our results show that the differences between viscous hydrodynamic formalisms are a significant source of uncertainty in the precise extraction of $\eta/s$ from experiments.
Calzetta Esteban
Peralta-Ramos J.
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