Eccentricity fluctuations in an integrated hybrid approach: Influence on elliptic flow

Petersen, Hannah; Bleicher, Marcus

doi:10.1103/physrevc.81.044906

Cited by 47 publications

(52 citation statements)

References 52 publications

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“…This also holds for the flow coefficient v 5 which still is in line with the data within error bars. It is quite remarkable that the collective behavior is reproduced not only for semi-central collisions (lower part) but also for 0-5% central collisions (upper part) that are more sensitive to the initial fluctuations [23].…”

Section: Differential Flow Results For Pb-pbmentioning

confidence: 94%

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Impact of the initial size of spatial fluctuations on the collective flow in Pb–Pb collisions at $\sqrt{{{s}_{{\rm NN}}}}$ = 2.76 TeV

Konchakovski¹,

Cassing²,

Тонеев³

2015

J. Phys. G: Nucl. Part. Phys.

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Abstract. The Parton-Hadron-String-Dynamics (PHSD) transport model is used to study the influence of the initial size of spatial fluctuations of the interacting system on flow observables in Pb-Pb collisions at √ s N N = 2.76 TeV for different centralities. While the flow coefficients v 2 , v 3 , v 4 and v 5 are reasonably described in comparison to the data from the ALICE Collaboration for different centralities within the default setting, no essential sensitivity is found with respect to the initial size of spatial fluctuations even for very central collisions where the flow coefficients are dominated by the size of initial state fluctuations. We attribute this lack of sensitivity partly to the low interaction rate of the degrees-of-freedom in this very early phase of order ∼ 0.3 fm/c which is also in common with the weakly interacting color glass condensate (CGC) or glasma approach. Moreover, since the event shape in the transverse plane is approximately the same for different size of spatial fluctuations very similar eccentricities ǫ n are transformed to roughly the same flow coefficients v n in momentum space.PACS numbers: 24.85.+p, 12.38.Mh

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Section: Differential Flow Results For Pb-pbmentioning

confidence: 94%

“…in Refs. [23,26] have shown that the elliptic flow v 2 in semi-peripheral reactions is dominated by the geometry and less by the initial state fluctuations, however, central collisions do show a sensitivity to these fluctuations. The same arguments hold for v 4 which is roughly ∼ v 2 2 (cf.…”

Section: Probing the Initial Size Of Spatial Fluctuations With Phsdmentioning

confidence: 99%

Impact of the initial size of spatial fluctuations on the collective flow in Pb–Pb collisions at $\sqrt{{{s}_{{\rm NN}}}}$ = 2.76 TeV

Konchakovski¹,

Cassing²,

Тонеев³

2015

J. Phys. G: Nucl. Part. Phys.

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“…There has been a significant effort recently in studying fluctuating initial conditions in heavy ion collisions [29][30][31][32][33][34] and studying their propagation in full fluid dynamic simulations or transport models [35][36][37][38][39][40][41][42][43][44]. Precursors of these developments include e.g.…”

Section: Jhep11(2011)100mentioning

confidence: 99%

Fluctuations around Bjorken flow and the onset of turbulent phenomena

Floerchinger

Wiedemann

2011

J. High Energ. Phys.

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We study how fluctuations in fluid dynamic fields can be dissipated or amplified within the characteristic spatio-temporal structure of a heavy ion collision. The initial conditions for a fluid dynamic evolution of heavy ion collisions may contain significant fluctuations in all fluid dynamical fields, including the velocity field and its vorticity components. We formulate and analyze the theory of local fluctuations around average fluid fields described by Bjorken's model. For conditions of laminar flow, when a linearized treatment of the dynamic evolution applies, we discuss explicitly how fluctuations of large wave number get dissipated while modes of sufficiently long wave-length pass almost unattenuated or can even be amplified. In the opposite case of large Reynold's numbers (which is inverse to viscosity), we establish that (after suitable coordinate transformations) the dynamics is governed by an evolution equation of non-relativistic Navier-Stokes type that becomes essentially two-dimensional at late times. One can then use the theory of Kolmogorov and Kraichnan for an explicit characterization of turbulent phenomena in terms of the wave-mode dependence of correlations of fluid dynamic fields. We note in particular that fluid dynamic correlations introduce characteristic power-law dependences in two-particle correlation functions.

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“…In addition, widely held beliefs as to which moments of the initial eccentricity distribution are directly related to which moments of the final flow distribution [17,21,26] must be tested by generating the final states hydrodyamically event by event, i.e. separately for each fluctuating initial condition [20,[27][28][29][30][31]. These are the goals addressed in the present article.…”

Section: Introductionmentioning

confidence: 99%

Event-by-event shape and flow fluctuations of relativistic heavy-ion collision fireballs

2011

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Heavy-ion collisions create deformed quark-gluon plasma (QGP) fireballs which explode anisotropically. The viscosity of the fireball matter determines its ability to convert the initial spatial deformation into momentum anisotropies that can be measured in the final hadron spectra. A quantitatively precise empirical extraction of the QGP viscosity thus requires a good understanding of the initial fireball deformation. This deformation fluctuates from event to event, and so does the finally observed momentum anisotropy. We present a harmonic decomposition of the initial fluctuations in shape and orientation of the fireball and perform event-by-event (2+1)-dimensional ideal fluid dynamical simulations to extract the resulting fluctuations in the magnitude and direction of the corresponding harmonic components of the final anisotropic flow at midrapidity. The final harmonic flow coefficients are found to depend non-linearly on the initial harmonic eccentricity coefficients. We show that, on average, initial density fluctuations suppress the buildup of elliptic flow relative to what one obtains from a smooth initial profile of the same eccentricity, and discuss implications for the phenomenological extraction of the QGP shear viscosity from experimental elliptic flow data.

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Eccentricity fluctuations in an integrated hybrid approach: Influence on elliptic flow

Cited by 47 publications

References 52 publications

Impact of the initial size of spatial fluctuations on the collective flow in Pb–Pb collisions at $\sqrt{{{s}_{{\rm NN}}}}$ = 2.76 TeV

Impact of the initial size of spatial fluctuations on the collective flow in Pb–Pb collisions at $\sqrt{{{s}_{{\rm NN}}}}$ = 2.76 TeV

Fluctuations around Bjorken flow and the onset of turbulent phenomena

Event-by-event shape and flow fluctuations of relativistic heavy-ion collision fireballs

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