Abstract

We explore the out-of-equilibrium dynamics of the quark-gluon plasma at zero and finite net-baryon density based on an effective kinetic theory of quantum chromodynamics (QCD). By investigating the isotropization of the longitudinal pressure, we determine the relevant time and temperature scales for the onset of viscous hydrodynamics and quantify the dependence on the chemical composition of the quark-gluon plasma. By extrapolating our results to realistic coupling strength, we discuss phenomenological consequences regarding the role of the preequilibrium phase at different collision energies.

Highlights

  • Introduction.—High-energy heavy-ion collisions at the Relativistic Heavy-Ion Collider (RHIC) and the Large Hadron Collider (LHC) provide a unique opportunity to explore the properties of strong interaction matter under extreme conditions

  • The memory loss of macroscopic quantities plays an important role in the phenomenological description of the preequilibrium stage of high-energy heavy-ion collisions, e.g., to quantify the amount of entropy production during the early preequilibrium stage which is directly connected to experimental measurements of the charged particle multiplicity in the final state [28] or to describe the space-time evolution of the preequilibrium plasma macroscopically in KoMPoST [10,31,32,33]

  • Effective kinetic description of preequilibrium dynamics.—During the collision of heavy nuclei, a fraction of the energy and valence charge is deposited in a primordial plasma, providing the initial conditions for the subsequent preequilibrium evolution of the quark-gluon plasma (QGP)

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Summary

Introduction

Introduction.—High-energy heavy-ion collisions at the Relativistic Heavy-Ion Collider (RHIC) and the Large Hadron Collider (LHC) provide a unique opportunity to explore the properties of strong interaction matter under extreme conditions. Effective kinetic description of preequilibrium dynamics.—During the collision of heavy nuclei, a fraction of the energy and valence charge is deposited in a primordial plasma, providing the initial conditions for the subsequent preequilibrium evolution of the QGP.

Results
Conclusion

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