Momentum-dependent flow fluctuations as a hydrodynamic response to initial geometry

Nov 6, 2019, 10:00 AM
Ball Room 3 (Wanda Reign Wuhan Hotel)

Ball Room 3

Wanda Reign Wuhan Hotel

Oral Presentation Collective dynamics and final state interaction Parallel Session - Collective dynamics IV


Mauricio Hippert (Universidade de São Paulo)


We propose a new and improved principal component analysis (PCA), which characterizes the fluctuations of anisotropic flow and how these fluctuations are correlated in transverse momentum. Then, using state-of-the-art hydrodynamic simulations, we make an explicit connection between the initial geometry and these principal components. The usual eccentricity scaling of anisotropic flow implies only a leading principal component, but by including more terms in a cumulant expansion, we can also describe subleading PCA modes, and explicitly show what properties of the initial state generate these subleading fluctuations. In particular, subleading elliptic flows are generated by higher order cumulants, and therefore probe small length scales of the initial state. Conversely, subleading triangular flow is more sensitive to nonlinear, mixed harmonic geometric anisotropies. With this information, it will be possible to put new constraints on properties of the early-time dynamics of a heavy-ion collision, including small-scale structure, as well as properties of the Quark-Gluon Plasma.

[1] M. Hippert, D. Dobrigkeit Chinellato, M. Luzum, J. Noronha, T. Nunes da Silva and J. Takahashi, arXiv:1906.08915
[2] M. Hippert, D. Dobrigkeit Chinellato, M. Luzum, J. Noronha, T. Nunes da Silva and J. Takahashi, in preparation

Primary authors

Mauricio Hippert (Universidade de São Paulo) Matthew Luzum David Dobrigkeit Chinellato (University of Campinas UNICAMP (BR)) Willian Matioli Serenone (Universidade de Campinas) Jorge Noronha (University of Sao Paulo) Dr Tiago Nunes da Silva (Universidade Estadual de Campinas) Jun Takahashi (University of Campinas UNICAMP (BR))

Presentation materials