Event-by-event hydrodynamics for heavy-ion collisions

Qiu, Zhi; Heinz, Ulrich

doi:10.1063/1.3700676

Cited by 29 publications

(24 citation statements)

References 6 publications

(11 reference statements)

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“…3 In Fig. 4.5 of Zhi Qiu's Ph.D. thesis [31] it was shown that this sign change is genuinely related with a sign change between the final hydrodynamic flow plane and initial participant plane correlators, and not qualitatively changed by mode-mixing effects inherent in the Cooper-Frye formula for computing the momentum distributions and their anisotropies at freeze-out [30]. This led the authors of Ref.…”

Section: "Mode Coupling" Between the Initial Eccentricitiesmentioning

confidence: 99%

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Mode-coupling effects in anisotropic flow in heavy-ion collisions

2016

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Higher-order anisotropic flows in heavy-ion collisions are affected by nonlinear mode coupling effects. It has been suggested that the associated nonlinear hydrodynamic response coefficients probe the transport properties and are largely insensitive to the spectrum of initial density fluctuations of the medium created in these collisions. To test this suggestion, we explore nonlinear mode coupling effects in event-by-event viscous fluid dynamics, using two different models for the fluctuating initial density profiles, and compare the nonlinear coupling coefficients between the initial eccentricity vectors before hydrodynamic expansion and the final flow vectors after the expansion. For several mode coupling coefficients we find significant sensitivity to the initial fluctuation spectrum. They all exhibit strong sensitivity to the specific shear viscosity at freeze-out, but only weak dependence on the shear viscosity during hydrodynamic evolution.

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Section: "Mode Coupling" Between the Initial Eccentricitiesmentioning

confidence: 99%

“…This observation is consistent with Refs. [17][18][19]31] where it was found that hydrodynamic evolution changes the sign of the correlations between the initial participant planes and the final flow planes that are associated with these coupling coefficients. 3 In Fig.…”

Section: "Mode Coupling" Between the Initial Eccentricitiesmentioning

confidence: 99%

Mode-coupling effects in anisotropic flow in heavy-ion collisions

2016

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“…In particular, comprehensive studies have been devoted to fluctuations of the average transverse momentum p T , both from the theoretical [34][35][36][37] and experimental side [38][39][40][41], as these fluctuations may reflect critical phenomena expected at the phase transition. Much progress has been made in understanding the response to initial fluctuations [11,[42][43][44][45][46]: typically, elliptic flow is proportional to the initial eccentricity [7]; triangular flow is proportional to the initial triangularity [10]; finally, p t fluctuations arise as a natural consequence of initial-state (size) fluctuations [47]. Eventually, the study of fluctuations essentially boils down to the study of the initial fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Correlations in the Monte Carlo Glauber model

2014

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Event-by-event fluctuations of observables are often modeled using the Monte Carlo Glauber model, in which the energy is initially deposited in sources associated with wounded nucleons.In this paper, we analyze in detail the correlations between these sources in proton-nucleus and nucleus-nucleus collisions. There are correlations arising from nucleon-nucleon correlations within each nucleus, and correlations due to the collision mechanism, which we dub twin correlations. We investigate this new phenomenon in detail. At the RHIC and LHC energies, correlations are found to have modest effects on size and eccentricity fluctuations, such that the Glauber model produces to a good approximation a collection of independent sources.

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“…Much attention has now been paid to fluctuations of the anisotropic flows of final hadrons due to the fluctuations in the initial states of heavy-ion collisions, such as the fluctuations of nucleon positions and color charges inside colliding nuclei and multiplicities of initial parton production [10]. One of the most interesting consequences of initial-state fluctuations is the presence of elliptic flow in the most central nucleus-nucleus collisions, and finite odd harmonic flows in the final-state azimuthal distributions [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. The elliptic, triangular and other higher-order harmonic flows have been measured in Au+Au collisions at RHIC and Pb+Pb collisions at the LHC [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Longitudinal decorrelation of anisotropic flows in heavy-ion collisions at the CERN Large Hadron Collider

et al. 2015

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Fluctuations in the initial transverse energy-density distribution lead to anisotropic flows as observed in central high-energy heavy-ion collisions. Studies of longitudinal fluctuations of the anisotropic flows can shed further lights on the initial conditions and dynamical evolution of the hot quark-gluon matter in these collisions. Correlations between anisotropic flows with varying pseudorapidity gaps in Pb+Pb collisions at the LHC are investigated using both an event-by-event (3+1)-D ideal hydrodynamical model with fluctuating initial conditions and the AMPT Monte Carlo model for high-energy heavy-ion collisions. Anisotropic flows at different pseudo-rapidities are found to become significantly decorrelated with increasing pseudo-rapidity gaps due to longitudinal fluctuations in the initial states of heavy-ion collisions. The longitudinal correlation of the elliptic flow shows a strong centrality dependence while the correlation of the triangular flow is independent of the centrality. Longitudinal fluctuations as a source of the decorrelation are further shown to consist of a twist or gradual rotation in flow angles between the forward and backward direction and additional fluctuations on top of the twist. Within the AMPT model, longitudinal correlations of anisotropic flows are also found to depend on the value of partonic cross sections. Implications on constraining the initial conditions and shear viscosity to entropy density ratio of the partonic matter in high-energy heavy-ion collisions are also discussed.

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Event-by-event hydrodynamics for heavy-ion collisions

Cited by 29 publications

References 6 publications

Mode-coupling effects in anisotropic flow in heavy-ion collisions

Mode-coupling effects in anisotropic flow in heavy-ion collisions

Correlations in the Monte Carlo Glauber model

Longitudinal decorrelation of anisotropic flows in heavy-ion collisions at the CERN Large Hadron Collider

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