Sub-nucleonic hotspots in the initial state increase longitudinal flow decorrelation and reduce baryon stopping in simulated Pb+Pb collisions, but the model still underestimates decorrelation in mid-central events.
Rapidity decorrelation of anisotropic flow caused by hydrodynamic fluctuations
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abstract
We investigate the effect of hydrodynamic fluctuations on the rapidity decorrelations of anisotropic flow in high-energy nuclear collisions using a (3+1)-dimensional integrated dynamical model. The integrated dynamical model consists of twisted initial conditions, fluctuating hydrodynamics, and hadronic cascades on an event-by-event basis. To understand the rapidity decorrelation, we analyze the factorization ratio in the longitudinal direction. Comparing the factorization ratios between fluctuating hydrodynamics and ordinary viscous hydrodynamics, we find a sizable effect of hydrodynamic fluctuations on rapidity decorrelations. We also propose to calculate the Legendre coefficients of the flow magnitude and the event-plane angle to understand the decorrelation of anisotropic flow in the longitudinal direction.
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Effects of sub-nucleonic fluctuations on the longitudinal structure of heavy-ion collisions
Sub-nucleonic hotspots in the initial state increase longitudinal flow decorrelation and reduce baryon stopping in simulated Pb+Pb collisions, but the model still underestimates decorrelation in mid-central events.