Jun 17 – 21, 2019
Europe/Budapest timezone

Suppression of anisotropic flow without viscosity

Jun 17, 2019, 4:30 PM


Adam Takacs (University of Bergen)


Relativistic viscous hydrodynamics calculations can describe a wide range of observables in relativistic heavy ion collisions. However, many studies suggest that the hot and dense system created is not in local thermal equilibrium, resulting in a contradiction for the applicability of hydrodynamics. In hydrodynamic calculations, a crucial step is to convert the fluid fields into observable particles. The most common approach is to use the Cooper-Frye formula, which assumes thermal (Boltzmann/Bose/Fermi) distributions at the conversion. In this talk, I show how local equilibrium distributions of the Tsallis form can affect observables, resulting in non-exponential particle distributions and a viscous-like suppression of the anisotropic flow. By comparing the calculation to experimental data, I will estimate the degree of non-Boltzmann effects on the freeze-out surface.

Primary authors

Adam Takacs (University of Bergen) Prof. Dénes Molnár (Purdue University)

Presentation materials