# Quark Matter 2014 - XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

19-24 May 2014
Europe/Zurich timezone

## Enhancement of Flow Harmonics due to Bulk Viscosity in Event by Event Hydrodynamics

20 May 2014, 16:30
2h

### spectrum

Board: H-23
Poster Collective Dynamics

### Speaker

Dr Jacquelyn Noronha-Hostler (University of Sao Paulo)

### Description

Shear and bulk viscosity effects on the collective flow harmonics in heavy ion collisions are investigated, on an event by event basis, using a newly developed 2+1 Lagrangian hydrodynamic code named v-USPhydro which implements the Smoothed Particle Hydrodynamics (SPH) algorithm for viscous hydrodynamics. A new formula for the bulk viscous corrections present in the distribution function at freeze-out is derived starting from the Boltzmann equation for multi-hadron species. Bulk viscosity is shown to enhance the collective flow Fourier coefficients from $v_2(p_T)$ to $v_5(p_T)$ when $% p_{T}\sim 1-2.5$ GeV even when the bulk viscosity to entropy density ratio, $% \zeta/s$, is significantly smaller than $1/(4\pi)$ whereas shear viscosity enhances $v_2(p_T)$ to $v_5(p_T)$.
On behalf of collaboration: None

### Primary author

Dr Jacquelyn Noronha-Hostler (University of Sao Paulo)

### Co-authors

Frederique Grassi Gabriel Denicol (McGill University) Jorge Noronha (University of Sao Paulo) Rone Andrade (Universidade de São Paulo USP)

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