First numerical implementation of Hydro+ in an expanding fireball shows critical fluctuations lag behind equilibrium, advect outward, and feed back only mildly on the bulk flow in this simplified model.
Causal Viscous Hydrodynamics for Central Heavy-Ion Collisions II: Meson Spectra and HBT Radii
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abstract
Causal viscous hydrodynamic fits to experimental data for pion and kaon transverse momentum spectra from central Au+Au collisions at \sqrt{s_{NN}}=200 GeV are presented. Starting the hydrodynamic evolution at 1 fm/c and using small values for the relaxation time, reasonable fits up to moderate ratios \eta/s\simeq 0.4 can be obtained. It is found that a percentage of roughly 50 \eta/s to 75 \eta/s of the final meson multiplicity is due to viscous entropy production. Finally, it is shown that with increasing viscosity, the ratio of HBT radii R_{out}/R_{side} approaches and eventually matches the experimental data.
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Hydro+ in Action: Understanding the Out-of-Equilibrium Dynamics Near a Critical Point in the QCD Phase Diagram
First numerical implementation of Hydro+ in an expanding fireball shows critical fluctuations lag behind equilibrium, advect outward, and feed back only mildly on the bulk flow in this simplified model.