The fluctuations of quadrangular flow

16th International Conference on Strangeness in Quark Matter

Giacalone, Giuliano^1 ; Yan, Li^1 ; Noronha-Hostler, Jacquelyn^2 ; Ollitrault, Jean-Yves^1

Institut de Physique Théorique, Université Paris Saclay, CNRS, CEA, Gif-sur-Yvette

F-91191, France^1

Department of Physics, University of Houston, Houston

TX

77204, United States^2

关键词: Combined effect;    Elliptic flows;    Fourth cumulants;    Non-linear hydrodynamics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/779/1/012064/pdf
DOI  :  10.1088/1742-6596/779/1/012064

来源: IOP

【 摘 要 】

The ATLAS Collaboration has measured for the first time the fourth cumulant of quadrangular flow, v4{4}4. Unlike the fourth cumulants of elliptic and triangular flows, it presents a change of sign above 30% centrality. We show that this change of sign is predicted by event-by-event hydrodynamics. We argue that it results from the combined effects of a nonlinear hydrodynamic response, which couples quadrangular flow to elliptic flow, and elliptic flow fluctuations.