# QM 2011 - XXII International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

## Event-by-event hydrodynamics and elliptic flow from fluctuating initial state

May 27, 2011, 3:20 PM
20m
Salons Ravel AB (Imperial Palace)

### Salons Ravel AB

#### Imperial Palace

Parallel Global and collective dynamics

### Speaker

Hannu Holopainen (University of Jyväskylä)

### Description

We develop a framework for event-by-event ideal hydrodynamics to study the differential elliptic flow which is measured at different centralities in Au+Au collisions at Relativistic Heavy Ion Collider (RHIC). Fluctuating initial energy density profiles, which here are the event-by-event analogues of the eWN profiles, are created using a Monte Carlo Glauber model. Using the same event plane method for obtaining $v_2$ as in the data analysis, we can reproduce both the measured centrality dependence and the $p_T$ shape of charged-particle elliptic flow up to $p_T\sim2$~GeV. We also consider the relation of elliptic flow to the initial state eccentricity using different reference planes, and discuss the correlation between the physical event plane and the initial participant plane. Our results demonstrate that event-by-event hydrodynamics with initial state fluctuations must be accounted for before a meaningful lower limit for viscosity can be obtained from elliptic flow data.

### Primary author

Hannu Holopainen (University of Jyväskylä)

### Co-authors

Dr Harri Niemi (Frankfurt Institute for Advanced Studies) Prof. Kari J. Eskola (University of Jyväskylä)

 Slides