Initial conditions for nuclear collisions: theory overview

Mazeliauskas, Aleksas

doi:10.1016/j.nuclphysa.2018.08.019

Cited by 5 publications

(3 citation statements)

References 62 publications

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“…As was shown in [26], the disregard of spectators and application of less strict isotropization criterion within the same UrQMD model can decrease the isotropization time of pressure to t = 3−6 fm/c. And transition to macroscopic hydrodynamic evolution can occur even for rather anisotropic systems with P T /P z ∼ 0.5 [13,15]. Thus, the beginning of hydrodynamic description may take place significantly earlier compared to rather conservative numbers extracted from Fig.…”

Section: Early Stage Of Heavy-ion Collisionsmentioning

confidence: 91%

“…According to other explanation, the low-order hydrodynamics can well approximate the hydrodynamic attractor solution describing out-of-equilibrium systems, thus justifying its applicability [11,12]. Hydrodynamization of nuclear matter produced in relativistic heavy-ion collisions has been studied extensively in the last years, see, e.g., [13][14][15] and references therein. One of the interesting results states [13] that the hydrodynamization time is proportional to shear viscosity η and inversely proportional to entropy density s and temperature T…”

Section: Introductionmentioning

confidence: 98%

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Emergent hydrodynamics in microscopic modeling of early stage of relativistic heavy-ion collisions

Bravina

Zabrodin

2020

Eur. Phys. J. A

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Time evolution of hot and dense nuclear matter produced in central gold-gold collisions at energies between $$E_{lab} = 10$$ E lab = 10 and 160 AGeV is studied within two transport string models, UrQMD and QGSM. In contrast to the previous studies, here we investigate the macroscopic characteristics of the system before the state of chemical and thermal equilibrium is attained. For all energies in question two interesting observations are made for times starting already from $$t \ge 1$$ t ≥ 1 fm/c. (1) The matter in the cell expands almost isentropically with nearly constant entropy per baryon. (2) Pressure in the cell appears to be very close to the pressure calculated for equilibrated hadron gas with the same values of energy density, baryon density and strangeness density. The pressure linearly depends on the energy density, $$P = a(\sqrt{s}) \varepsilon $$ P = a ( s ) ε . Therefore, both observations endorses the formal application of relativistic hydrodynamics from the very early stages of heavy-ion collisions, despite of the fact that the matter in the fireball is out of equilibrium.

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Section: Early Stage Of Heavy-ion Collisionsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 98%

Emergent hydrodynamics in microscopic modeling of early stage of relativistic heavy-ion collisions

Bravina

Zabrodin

2020

Eur. Phys. J. A

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“…After the rescaling of the axes both kinetic evolutions coincide. For the homogeneous conformalPoS(Confinement2018)152Matching initial stage of heavy ion collisions to hydrodynamics Contour plot of hydrodynamization time to system size ratio τ hydro /R as a function specific shear viscosity η/s and charged particle multiplicity dN ch /dη.Figure adapted from[31].…”

mentioning

confidence: 99%

Matching the non-equilibrium initial stage of heavy ion collisions to hydrodynamics with QCD kinetic theory

Mazeliauska¹,

Kurkela²,

Paquet³

et al. 2019

Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)

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In the collision of nuclei at high energies the produced matter reinteracts and forms a plasma which ultimately equilibrates and exhibits collective hydrodynamic flow. While a general theory of the equilibration process has been outlined previously, there were no practical frameworks to smoothly connect the early gluon production in classical field simulations with hydrodynamic simulations of the late time plasma expansion. We provide this practical tool (called KøMPøST) by constructing a set of non-equilibrium Green functions calculated in QCD kinetic theory. We demonstrate with a realistic simulation of a heavy ion collisions the smooth transition from the classical fields to hydrodynamics, and calculate the pragmatic lower bound on the system size for the hydrodynamics to be applicable.

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Glauber Monte Carlo predictions for ultrarelativistic collisions with O16

Rybczyński

Broniówski

2019

Phys. Rev. C

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We explore Glauber Monte Carlo predictions for the planned ultra-relativistic 16 O+ 16 O and p+ 16 O collisions, as well as for collisions of 16 O on heavy targets. In particular, we present specific collective flow measures which are approximately independent on the hydrodynamic response of the system, such as the ratios of eccentricities obtained from cumulants with different numbers of particles, or correlations of ellipticity and triangularity described by the normalized symmetric cumulants. We use the state-of-the-art correlated nuclear distributions for 16 O and compare the results to the uncorrelated case, finding moderate effects for the most central collisions. We also consider the wounded quark model, which turns out to yield similar results to the wounded nucleon model for the considered measures. The purpose of our study is to prepare some ground for the upcoming experimental proposals, as well as to provide input for possible more detailed dynamical studies with hydrodynamics or transport codes.

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Initial conditions for nuclear collisions: theory overview

Cited by 5 publications

References 62 publications

Emergent hydrodynamics in microscopic modeling of early stage of relativistic heavy-ion collisions

Emergent hydrodynamics in microscopic modeling of early stage of relativistic heavy-ion collisions

Matching the non-equilibrium initial stage of heavy ion collisions to hydrodynamics with QCD kinetic theory

Glauber Monte Carlo predictions for ultrarelativistic collisions with O16

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