Event-shape fluctuations and flow correlations in ultra-relativistic heavy-ion collisions

Understand

I review recent measurements of a large set of flow observables associated with event-shape fluctuations and collective expansion in heavy ion collisions.

• First, these flow observables are classified and experiment methods are introduced.
• The experimental results for each type of observables are then presented and compared to theoretical calculations.
• A coherent picture of initial condition and collective flow based on linear and non-linear hydrodynamic responses is derived, which qualitatively describe most experimental results.