Does parton saturation at high density explain hadron multiplicities at RHIC?

Baier, Rudolf; Mueller, A. H.; Schiff, D.; Son, D.C.

doi:10.1016/s0370-2693(02)02037-3

Cited by 92 publications

(92 citation statements)

References 33 publications

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“…According to Ref. [60], the numerical CGC simulations of Ref. [61,62] correspond to c ≃ 0.5, while an approximate analytical calculation by Kovchegov [55] gave c = 2 ln 2 ≈ 1.386.…”

Section: Appendix C: Matching To Cgc Parametersmentioning

confidence: 96%

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Instabilities of an anisotropically expanding non-Abelian plasma:1D+3Vdiscretized hard-loop simulations

2008

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Non-Abelian plasma instabilities play a crucial role in the nonequilibrium dynamics of a weakly coupled quark-gluon plasma and they importantly modify the standard perturbative bottom-up thermalization scenario in heavy-ion collisions. Using the auxiliary-field formulation of the hard-loop effective theory, we study numerically the real time evolution of instabilities in an anisotropic collisionless Yang-Mills plasma expanding longitudinally in free streaming. In this first real-time lattice simulation we consider the most unstable modes, long-wavelength coherent color fields that are constant in transverse directions and which therefore are effectively 1+1-dimensional in spacetime, except for the auxiliary fields which also depend on discretized momentum rapidity and transverse velocity components. We reproduce the semi-analytical results obtained previously for the Abelian regime and we determine the nonlinear effects which occur when the instabilities have grown such that non-Abelian interactions become important.

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“…According to Ref. [60], the numerical CGC simulations of Ref. [61,62] correspond to c ≃ 0.5, while an approximate analytical calculation by Kovchegov [55] gave c = 2 ln 2 ≈ 1.386.…”

Section: Appendix C: Matching To Cgc Parametersmentioning

confidence: 96%

“…The normalization N can then be fixed by following Ref. [60], who write the initial hard-gluon density as…”

Section: Appendix C: Matching To Cgc Parametersmentioning

confidence: 99%

Instabilities of an anisotropically expanding non-Abelian plasma:1D+3Vdiscretized hard-loop simulations

2008

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“…(2.3). 3 With a finite ℓ max cutoff, some of this excitation energy "bounces off" the ℓ max cutoff and re-enters the infrared. This effect becomes smaller as ℓ max is raised, but can be largely eliminated with the damping term we add.…”

Section: Setup and Formalismmentioning

confidence: 99%

QCD plasma instabilities: The non-Abelian cascade

2006

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Magnetic plasma instabilities appear to play an important role in the early stages of quark-gluon plasma equilibration in the high energy (weak coupling) limit. Numerical studies of the growth of such instabilities from small seed fluctuations have found initial exponential growth in their energy, followed by linear growth once the associated color magnetic fields become so large that their non-abelian interaction are non-perturbative. In this paper, we use simulations to determine the nature of this linear energy growth. We find that the long-wavelength modes associated with the instability have ceased to grow, but that they cascade energy towards the ultraviolet in the form of plasmon excitations of ever increasing energy. We find a quasi-steady-state power-law distribution f k ∝ k −ν for this cascade, with spectral index ν ≃ 2.

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“…(Centrality independent gluon multiplication processes have been absorbed into N .) In fact, within the bottom-up thermalization scenario one does expect, parametrically, that gluon splittings increase the multiplicity by a factor ∼ 1/α 2/5 [43] before the system thermalizes at τ 0 and the hydrodynamic evolution begins. If the scale for running of the coupling is set by Q s , this would lead to an increase of the multiplicity for the most central Au+Au collisions by roughly 20%.…”

Section: The Cgc Initial Conditionmentioning

confidence: 99%

Entropy production in high-energy heavy-ion collisions and the correlation of shear viscosity and thermalization time

2007

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We study entropy production in the early stage of high-energy heavy-ion collisions due to shear viscosity. We employ the second-order theory of Israel-Stewart with two different stress relaxation times, as appropriate for strong coupling or for a Boltzmann gas, respectively, and compare the hydrodynamic evolution. Based on present knowledge of initial particle production, we argue that entropy production is tightly constrained. We derive new limits on the shear viscosity to entropy density ratio η/s, independent from elliptic flow effects, and determine the corresponding Reynolds number. Furthermore, we show that for a given entropy production bound, that the initial time τ0 for hydrodynamics is correlated to the viscosity. The conjectured lower bound for η/s provides a lower limit for τ0.

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Does parton saturation at high density explain hadron multiplicities at RHIC?

Cited by 92 publications

References 33 publications

Instabilities of an anisotropically expanding non-Abelian plasma:1D+3Vdiscretized hard-loop simulations

Instabilities of an anisotropically expanding non-Abelian plasma:1D+3Vdiscretized hard-loop simulations

QCD plasma instabilities: The non-Abelian cascade

Entropy production in high-energy heavy-ion collisions and the correlation of shear viscosity and thermalization time

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