Chemical Equilibration in Hadronic Collisions

Kurkela, Aleksi; Mazeliauskas, Aleksas

doi:10.1103/physrevlett.122.142301

Cited by 72 publications

(82 citation statements)

References 89 publications

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“…(20), (33) and (32). Such universality allows one to convert the dimensionless time τ /τ R to physical units by matching the late time constants (τ 1/3 T ) ∞ and η/s from hydrodynamical modelling of heavy ion collisions and which is explored in our companion paper [65]. The dynamical simulations of the Boltzmann equation with leading order QCD kinetic theory collisions kernels, Eq.…”

Section: Discussionmentioning

confidence: 99%

Chemical equilibration in weakly coupled QCD

Kurkela

Mazeliauskas

2019

Phys. Rev. D

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We study thermalization, hydrodynamization, and chemical equilibration in out-of-equilibrium Quark-Gluon Plasma starting from various initial conditions using QCD effective kinetic theory, valid at weak coupling. In non-expanding systems gauge bosons rapidly lose information of the initial state and achieve kinetic equilibrium among themselves, while fermions approach the equilibrium distribution only at later time. In systems undergoing rapid longitudinal expansion, both gluons and quarks are kept away from equilibrium by the expansion, but the evolution is well described by fluid dynamics even before local thermal equilibrium is reached. For realistic couplings we determine the ordering between the separate hydrodynamization, chemical equilibration and thermalization time scales to be τ hydro < τ chem < τ therm .

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Section: Discussionmentioning

confidence: 99%

Chemical equilibration in weakly coupled QCD

Kurkela

Mazeliauskas

2019

Phys. Rev. D

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“…It would be very interesting to consider the 2 ↔ 2 scalar kinetic theory using Monte-Carlo-based transport in order to compare with the exact results obtained herein using number-conserving RTA. It would also be interesting to make comparisons with the attractor extracted from the effective kinetic theory framework of Kurkela et al, particularly in the case that baryon number conservation is at play [8,12,88,89].…”

Section: Discussionmentioning

confidence: 99%

Exact solution for the non-equilibrium attractor in number-conserving relaxation time approximation

Strickland

Tantary

2019

J. High Energ. Phys.

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We extend previous studies of the conformal 0+1d kinetic non-equilibrium attractor in relaxation time approximation by enforcing number conservation through the introduction of a dynamical fugacity (chemical potential). We derive two coupled integral equations for the effective temperature and fugacity which are then solved numerically to obtain the exact solution. The resulting solutions exhibit convergence to a unique nonequilibrium attractor when the scaled moments of the distribution function are plotted as a function of the rescaled time w = τ /τ eq . This occurs even though the system is out of chemical equilibrium at late times. In addition, compared to the case where number conservation was not imposed, we find that the moments converge to their respective attractors more quickly, particularly for moments with m = 0. Finally, we compare the resulting attractor moments with predictions from different hydrodynamic frameworks.

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“…using the numerical setup developed in Refs. [19,20]. order elastic scatterings in the coupling α s ≡ g 2 /(4π).…”

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confidence: 99%

“…However, our results establish the existence of a new hydrodynamic regime far away from equilibrium at early times, which has not much to say about the later time approach to thermal equilibrium, where more conventional hydrodynamic descriptions should be applied. The subsequent evolution of the quark-gluon plasma towards thermal equilibrium with QCD kinetic theory is the subject of a separate work [19,20].…”

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Prescaling and Far-from-Equilibrium Hydrodynamics in the Quark-Gluon Plasma

Mazeliauskas

Berges

2019

Phys. Rev. Lett.

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Prescaling is a far-from-equilibrium phenomenon which describes the rapid establishment of a universal scaling form of distributions much before the universal values of their scaling exponents are realized. We consider the example of the spatio-temporal evolution of the quark-gluon plasma explored in heavy-ion collisions at sufficiently high energies. Solving QCD kinetic theory with elastic and inelastic processes, we demonstrate that the gluon and quark distributions very quickly adapt a self-similar scaling form, which is independent of initial condition details and system parameters. The dynamics in the prescaling regime is then fully encoded in a few time-dependent scaling exponents, whose slow evolution gives rise to far-from-equilibrium hydrodynamic behavior.

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Chemical Equilibration in Hadronic Collisions

Cited by 72 publications

References 89 publications

Chemical equilibration in weakly coupled QCD

Chemical equilibration in weakly coupled QCD

Exact solution for the non-equilibrium attractor in number-conserving relaxation time approximation

Prescaling and Far-from-Equilibrium Hydrodynamics in the Quark-Gluon Plasma

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