Hydrodynamic fluctuations in Pb + Pb collisions at LHC

Sakai, Azumi; Murase, Koichi; Hirano, Tetsufumi

doi:10.1016/j.nuclphysa.2017.05.010

Cited by 13 publications

(10 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One sees r 2 from viscous hydrodynamics with initial longitudinal fluctuations decreases with η a p . This is in contrast to the result r 2 ∼ 1 obtained in our previous study without initial fluctuations [12], and indicates the importance of the initial longitudinal fluctuations of the entropy density distribution to the factorization breaking as well. While, r 2 from fluctuating hydrodynamics with initial longitudinal fluctuations decreases with η a p more significantly than that from viscous hydrodynamics does.…”

Section: Resultscontrasting

confidence: 99%

Rapidity Decorrelation from Hydrodynamic Fluctuations and Initial Fluctuations

Sakai

Murase

Hirano

2019

Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)

Self Cite

View full text Add to dashboard Cite

Rapidity decorrelation in high energy heavy-ion collisions is one of the hot topics in understanding longitudinal dynamics of the quark gluon plasma (QGP). In this study we employ an integrated dynamical model with full three dimensional relativistic hydrodynamics and perform event-by-event numerical simulations of Pb+Pb collisions at the LHC energy. We analyze factorization ratios to understand rapidity decorrelation from hydrodynamic fluctuations and initial longitudinal fluctuations. We show that factorization breaking happens due to both hydrodynamic fluctuations and initial longitudinal fluctuations. We conclude hydrodynamic fluctuations and initial longitudinal fluctuations are both important in understanding rapidity decorrelation.

show abstract

Section: Resultscontrasting

confidence: 99%

Rapidity Decorrelation from Hydrodynamic Fluctuations and Initial Fluctuations

Sakai

Murase

Hirano

2019

Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)

Self Cite

View full text Add to dashboard Cite

show abstract

“…(7) It has been noticed in the numerous model calculations [10][11][12][18][19][20][21][22][23][24] and in the experimental data [1][2][3] that the flow decorrelation is larger for centralities where the flow magnitude is small (such as the central collisions for v 2 ). To gain more insight, in a model one can study separately the decorrelation of the magnitude and of the flow angle, and we will carry out this analysis in our hydrodynamic framework applying the cumulative-event procedure to increase statistics and remove the non-flow effects.…”

Section: Decorrelation Of the Flow Event-plane Angles And Magnitudesmentioning

confidence: 99%

“…With the results for the torque effect for p+Pb collisions from [16] it became clear that the fluctuation mechanism is more subtle. Extra fluctuations from string breaking [18][19][20][21], glasma [22], or decelerating strings [23] were investigated. Yet, a uniform physical model of flow decorrelation, working for different collision systems 1 By operational definition, a source is an early object which deposits entropy in the fireball.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal decorrelation measures of flow magnitude and event-plane angles in ultrarelativistic nuclear collisions

Božek

Broniowski

2018

Phys. Rev. C

View full text Add to dashboard Cite

We discuss the forward-backward correlations of harmonic flow in Pb+Pb collisions at the CERN Large Hadron Collider (LHC), applying standard multibin measures, as well as proposed here new measures. We illustrate the methods with hydrodynamic model simulations based on event-by-event initial conditions from the wounded quark model with asymmetric rapidity emission profiles. Within the model we examine independently the event-plane angle and the flow magnitude decorrelations. We find specific hierarchy between various flow decorrelation measures and confirm certain factorization relations. We find qualitative agreement of the model and the data from the ATLAS and CMS Collaborations.

show abstract

“…Previous works have estimated the effect of thermal fluctuations in the context of simplified Bjorken [3] or Gubser flows [4]. More realistic simulations have treated fluctuations as a perturbation [5] or have used smearing of noise terms [6]. Building on those works, a systematic mode-by-mode analysis is done here to treat noise evolution within the hydrodynamic framework consistently.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Fluctuations in Relativistic Heavy-Ion Collisions

et al. 2019

View full text Add to dashboard Cite

We present a novel approach to the treatment of thermal fluctuations in the (3+1)-D viscous hydrodynamic simulation MUSIC. The phenomenological impact of thermal fluctuations on hadronic observables is investigated using the IP-Glasma + hydrodynamics + hadronic cascade hybrid approach. The anisotropic flow observed in heavy-ion collision experiments is mostly attributed to the hydrodynamic response to the event-by-event collision geometry and to the subnucleon quantum fluctuations. However, hydrodynamic fluctuations are present during the dynamical evolution of the Quark Gluon Plasma (QGP) and are quantified by the fluctuation-dissipation theorem. They can leave their imprint on final-state observables. By analyzing the thermal noise mode-by-mode, we provide a consistent scheme of treating these fluctuations as the source terms for hydrodynamic fields. These source terms are then evolved together with hydrodynamic equations of motion. Such a treatment captures the non-perturbative nature of the evolution for these thermal fluctuations.

show abstract

Hydrodynamic fluctuations in Pb + Pb collisions at LHC

Cited by 13 publications

References 4 publications

Rapidity Decorrelation from Hydrodynamic Fluctuations and Initial Fluctuations

Rapidity Decorrelation from Hydrodynamic Fluctuations and Initial Fluctuations

Longitudinal decorrelation measures of flow magnitude and event-plane angles in ultrarelativistic nuclear collisions

Hydrodynamic Fluctuations in Relativistic Heavy-Ion Collisions

Contact Info

Product

Resources

About