Collective Flow Global Collective Flow in Heavy Ion Reactions from the Beginnings to the Future

Abstract

Fluid dynamical models preceded the first heavy ion accelerator experiments, and led to the main trend of this research since then. In recent years fluid dynamical processes became a dominant direction of research in high energy heavy ion reactions. The Quark-gluon Plasma formed in these reactions has low viscosity, which leads to significant fluctuations and turbulent instabilities. One has to study and separate these two effects, but this is not done yet in a systematic way. Here we present a few selected points of the early developments, the most interesting collective flow instabilities, their origins, their possible ways of detection and separation form random fluctuations arising from different origins, among these the most studied is the randomness of the initial configuration in the transverse plane.

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• Global $\Lambda$ hyperon polarization in nuclear collisions: evidence for the most vortical fluid
• Pseudorapidity distribution and decorrelation of anisotropic flow within CLVisc hydrodynamics
• Beam-Energy Dependence of Directed Flow of $\Lambda$, $\bar{\Lambda }$, $K^{\pm }$, $K_s^0$ and $\varphi$ in Au+Au Collisions
• Decorrelation of anisotropic flows along the longitudinal direction
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• $\Lambda$ polarization in peripheral collisions at moderate relativistic energies
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• Influence of jets and decays of resonances on the triangular flow in ultrarelativistic heavy-ion collisions
• When Is Holography Consistent?
• An Initial State with Shear in Peripheral Heavy Ion Collisions