Classification of initial state granularity via 2D Fourier expansion

Coleman-Smith, Christopher E.; Petersen, Hannah; Wolpert, Robert L.

doi:10.1088/0954-3899/40/9/095103

Cited by 31 publications

(28 citation statements)

References 45 publications

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“…Indeed, one can find combinations of observables that effectively remove the dependence on medium properties [29], or conversely, to isolate medium properties, in a way that would not be possible without this knowledge [35]. Note that, in principle, one can use any choice of basis to characterize the initial transverse density [49,50]. However, one benefits enormously by choosing a basis that converges most quickly (in the sense of the expansion Eq.…”

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confidence: 99%

Effects of viscosity on the mapping of initial to final state in heavy ion collisions

et al. 2015

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We investigate the correlation between various aspects of the initial geometry of heavy ion collisions at the Relativistic Heavy Ion Collider energies and the final anisotropic flow, using v-USPhydro, a 2+1 event-by-event viscous relativistic hydrodynamical model. We test the extent of which shear and bulk viscosity affect the prediction of the final flow harmonics, vn, from the initial eccentricities, εn. We investigate in detail the flow harmonics v1 through v5 where we find that v1, v4, and v5 are dependent on more complicated aspects of the initial geometry that are especially important for the description of peripheral collisions, including a non-linear dependence on eccentricities as well as a dependence on shorter-scale features of the initial density. Furthermore, we compare our results to previous results from NeXSPheRIO, a 3+1 relativistic ideal hydrodynamical model that has a non-zero initial flow contribution, and find that the combined contribution from 3+1 dynamics and non-zero, fluctuating initial flow decreases the predictive ability of the initial eccentricities, in particular for very peripheral collisions, but also disproportionately in central collisions.

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confidence: 99%

Effects of viscosity on the mapping of initial to final state in heavy ion collisions

et al. 2015

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“…Hydrodynamic model with event-by-event (e-by-e) fluctuating initial conditions is considered to be one of the most successful frameworks in recent times to study the evolution of the hot and dense Quark-Gluon-Plasma (QGP) produced in collisions of heavy nuclei at the relativistic energies [1][2][3][4][5][6][7][8][9]. Hydrodynamic model with smooth initial density distribution was used for a long time earlier to explain the particle spectra and large elliptic flow of hadrons produced in heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) [10].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic flow of thermal photons at energies available at the BNL Relativistic Heavy Ion Collider and at the CERN Large Hadron Collider

2017

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We calculate elliptic and triangular flow parameters of thermal photons using an event-by-event hydrodynamic model with fluctuating initial conditions at 200A GeV Au+Au collisions at RHIC and at 2.76A TeV Pb+Pb collisions at the LHC for three different centrality bins. The photon elliptic flow shows strong centrality dependence where v2(pT ) increases towards peripheral collisions both at RHIC and at the LHC energies. However, the triangular flow parameter does not show significant dependence to the collision centrality. The elliptic as well as the triangular flow parameters found to underestimate the PHENIX data at RHIC by a large margin for all three centrality bins. We calculate pT spectrum and anisotropic flow of thermal photons from 200A GeV Cu+Cu collisions at RHIC for 0-20% centrality bin and compare with the results with those from Au+Au collisions. The production of thermal photon is found to decrease significantly for Cu+Cu collisions compared to Au+Au collisions. However, the effect of initial state fluctuation is found to be more pronounced for anisotropic flow resulting in larger v2 and v3 for Cu+Cu collisions. We study the correlation between the anisotropic flow parameters and the corresponding initial spatial anisotropies from their event by event distributions at RHIC and at the LHC energies. The linear correlation between v2 and ǫ2 is found be stronger compared to the correlation between v3 and ǫ3. In addition, the correlation coefficient is found to be larger at LHC than at RHIC.

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“…To this end, we employ in the following a Bessel-* Stefan.Floerchinger@cern.ch † Urs. Wiedemann@cern.ch Fourier expansion that-with the exception of one remarkable work [24]-has not been explored for the characterization of initial conditions so far.…”

Section: Introductionmentioning

confidence: 99%

Characterization of initial fluctuations for the hydrodynamical description of heavy ion collisions

Floerchinger

Wiedemann

2013

Phys. Rev. C

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Event-by-event fluctuations in the initial conditions for a hydrodynamical description of heavy ion collisions are characterized. We propose a Bessel-Fourier decomposition with respect to the azimuthal angle, the radius in the transverse plane, and rapidity. This allows for a complete characterization of fluctuations in all hydrodynamical fields including energy density, pressure, fluid velocity, shear stress, and bulk viscous pressure. It has the advantage that fluctuations can be ordered with respect to their wavelength and that they can be propagated mode by mode within the hydrodynamical formalism. Event ensembles can then be characterized in terms of a functional probability distribution. For the event ensemble of a Monte Carlo Glauber model, we provide evidence that the latter is close to Gaussian form, thus allowing for a particularly simple characterization of the event distribution.

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Classification of initial state granularity via 2D Fourier expansion

Cited by 31 publications

References 45 publications

Effects of viscosity on the mapping of initial to final state in heavy ion collisions

Effects of viscosity on the mapping of initial to final state in heavy ion collisions

Anisotropic flow of thermal photons at energies available at the BNL Relativistic Heavy Ion Collider and at the CERN Large Hadron Collider

Characterization of initial fluctuations for the hydrodynamical description of heavy ion collisions

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