Boltzmann-Langevin approach to pre-equilibrium correlations in nuclear collisions

Gavin, Sean; Moschelli, George; Zin, Christopher

doi:10.1103/physrevc.95.064901

Cited by 10 publications

(17 citation statements)

References 92 publications

(213 reference statements)

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“…The study of event-by-event correlations and fluctuations in global quantities can provide insight into the properties of the hot and dense matter created in Au+Au collisions at ultrarelativistic collision energies . Correlations of transverse momentum, p t , have been proposed as a measure of thermalization [15,22,23] and as a probe for the critical point of quantum chromodynamics (QCD) [14,24]. A detailed study of the dependence of two-particle p t correlations on collision energy and centrality may elucidate the effects of thermalization.…”

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confidence: 99%

“…correlation is not sensitive to the efficiency, which allows for the presentation of the experimental results without correction for tracking efficiency. Figure 3 shows the comparison of a Boltzmann-Langevin approach to the study of equilibration and thermalization effects on two-particle p t correlations [23]. The results for local equilibrium flow and partial thermalization are shown compared with current results for 19.6 and 200 GeV collisions as well as the results from Pb+Pb collisions at 2.76 TeV [36].…”

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confidence: 99%

“…The authors of Ref. [23] point out that these comparisons suggest incomplete thermalization in peripheral collisions because they disagree with a local equilibrium flow model. The agreement in Fig.…”

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confidence: 99%

“…The data from CERES [35] in Fig. 5 for Au+Au collisions as a function of collision energy for the 0-5% centrality bin along with results for Pb+Pb from CERES [35] and results for Pb+Pb from ALICE [36] along with UrQMD calculations and results from Boltzmann-Langevin model calculations [23]. The solid line is drawn to guide the eye.…”

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confidence: 99%

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Collision-energy dependence of pt correlations in Au + Au collisions at energies available at the BNL Relativistic Heavy Ion Collider

Adam¹,

Adamczyk²,

Adams³

et al. 2019

Phys. Rev. C

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Collision-energy dependence of pt correlations in Au + Au collisions at energies available at the BNL Relativistic Heavy Ion Collider

Adam¹,

Adamczyk²,

Adams³

et al. 2019

Phys. Rev. C

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“…In contrast to hydrodynamic or transport simulations that have computationally expensive numerics and lose two-particle spatial correlation information when performing freeze-out, we map the evolution of correlations throughout the whole lifetime of the collision with comparably small numerical resources. Finally, we comment that more information can be obtained about two-particle correlation functions by studying pre-equilibrium fluctuations [6].…”

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confidence: 97%

Measuring the Rate of Isotropization of Quark-Gluon Plasma Using Rapidity Correlations

Moschelli

Gavin

2019

Nuclear Physics A

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We propose that rapidity dependent momentum correlations can be used to extract the shear relaxation time τ π of the medium formed in high energy nuclear collisions. The stress-energy tensor in an equilibrium quark-gluon plasma is isotropic, but in nuclear collisions it is likely very far from this state. The relaxation time τ π characterizes the rate of isotropization and is a transport coefficient as fundamental as the shear viscosity. We show that fluctuations emerging from the initial anisotropy survive to freeze-out, in excess of thermal fluctuations, influencing rapidity correlation patterns. We show that these correlations can be used to extract τ π . In [1] we describe a method for calculating the rapidity dependence of two-particle momentum correlations with a second order, causal, diffusion equation that includes Langevin noise as a source of thermal fluctuations. The causality requirement introduces the relaxation time and we link the shape of the rapidity correlation pattern to its presence. Here we examine how different equations of state and temperature dependent transport coefficients in the presence of realistic hydrodynamic flow influence the estimate of τ π . In comparison to RHIC data, we find that the ratio τ π /ν ≈ 5 − 6 where ν = η/sT is the kinematic viscosity.

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Progress of quantum molecular dynamics model and its applications in heavy ion collisions

Zhang

Wang

et al. 2020

Front. Phys.

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In this review article, we first briefly introduce the transport theory and quantum molecular dynamics model applied in the study of the heavy ion collisions from low to intermediate energies.The developments of improved quantum molecular dynamics model (ImQMD) and ultra-relativistic quantum molecular dynamics model (UrQMD), are reviewed. The reaction mechanism and phenomena related to the fusion, multinucleon transfer, fragmentation, collective flow and particle production are reviewed and discussed within the framework of the two models. The constraints on the isospin asymmetric nuclear equation of state and in-medium nucleon-nucleon cross sections by comparing the heavy ion collision data with transport models calculations in last decades are also discussed, and the uncertainties of these constraints are analyzed as well. Finally, we discuss the future direction of the development of the transport models for improving the understanding of the reaction mechanism, the descriptions of various observables, the constraint on the nuclear equation of state, as well as for the constraint on in-medium nucleon-nucleon cross sections.

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Boltzmann-Langevin approach to pre-equilibrium correlations in nuclear collisions

Cited by 10 publications

References 92 publications

Collision-energy dependence of pt correlations in Au + Au collisions at energies available at the BNL Relativistic Heavy Ion Collider

Collision-energy dependence of pt correlations in Au + Au collisions at energies available at the BNL Relativistic Heavy Ion Collider

Measuring the Rate of Isotropization of Quark-Gluon Plasma Using Rapidity Correlations

Progress of quantum molecular dynamics model and its applications in heavy ion collisions

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