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

M. Hippert, D. D. Chinellato, M. Luzum, J. Noronha, T. Nunes da Silva, J. Takahashi

Research output: Contribution to journalArticlepeer-review


We propose a redefinition of the principal component analysis (PCA) of anisotropic flow that makes it more directly connected to fluctuations of the initial geometry of the system. Then, using state-of-the-art hydrodynamic simulations, we make an explicit connection between flow fluctuations and a cumulant expansion of the initial transverse geometry. In particular, we show that the second principal component of elliptic flow is generated by higher-order cumulants, and therefore probes smaller length scales of the initial state. 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.

Original languageEnglish (US)
Article number121982
JournalNuclear Physics A
StatePublished - Jan 2021
Externally publishedYes


  • anisotropic flow
  • collective dynamics
  • heavy-ion collisions
  • principal component analysis

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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