The fluctuations of quadrangular flow

Abstract

The ATLAS Collaboration has measured for the first time the fourth cumulant of quadrangular flow, $v_4\{4{\}}^4$. 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.

4 pages. 2 figures

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Cited by in corpus (7)

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• Precision tests of the nonlinear mode coupling of anisotropic flow via high-energy collisions of isobars
• Measures of azimuthal anisotropy in high-energy collisions
• Impact parameter dependence of anisotropic flow: Bayesian reconstruction in ultracentral nucleus-nucleus collisions
• Bayesian reconstruction of anisotropic flow fluctuations at fixed impact parameter