Effects of initial-state dynamics on collective flow within a coupled transport and viscous hydrodynamic approach

Abstract

We evaluate the effects of preequilibrium dynamics on observables in ultrarelativistic heavy-ion collisions. We simulate the initial nonequilibrium phase within A MultiPhase Transport (AMPT) model, while the subsequent near-equilibrium evolution is modeled using (2+1)-dimensional relativistic viscous hydrodynamics. We match the two stages of evolution carefully by calculating the full energy-momentum tensor from AMPT and using it as input for the hydrodynamic evolution. We find that when the preequilibrium evolution is taken into account, final-state observables are insensitive to the switching time from AMPT to hydrodynamics. Unlike some earlier treatments of preequilibrium dynamics, we do not find the initial shear viscous tensor to be large. With a shear viscosity to entropy density ratio of $0.12$, our model describes quantitatively a large set of experimental data on Pb+Pb collisions at the Large Hadron Collider(LHC) over a wide range of centrality: differential anisotropic flow $v_n(p_T)(n=2-6)$, event-plane correlations, correlation between $v_2$ and $v_3$, and cumulant ratio $v_2\{4\}/v_2\{2\}$.

10 pages, v2: minor revision

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Cited by in corpus (13)

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• Elliptic flow fluctuations in central collisions of spherical and deformed nuclei
• Hydrodynamic response in simulations within a multiphase transport model
• Radiative heavy quark energy loss in an expanding viscous QCD plasma
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• Thermal noise in a boost-invariant matter expansion in relativistic heavy-ion collisions
• Pseudorapidity dependent hydrodynamic response in heavy-ion collisions
• Using the non-hydrodynamic mode to study the onset of hydrodynamic behavior in ultraperipheral symmetric nuclear collisions
• Thermal noise in non-boost-invariant dissipative hydrodynamics
• Cumulants of conserved charges in hydrodynamic simulations
• Partonic transport model application to heavy flavor
• Investigations of the linear and non-linear flow harmonics using the A Multi-Phase Transport model
• Non-Markovian dynamics of bottomonia in the QGP