25 February 2019 to 1 March 2019
Lund university
Europe/Stockholm timezone

Suppression of anisotropic flow without viscosity

28 Feb 2019, 10:45
Lundmarksalen (Lund university)


Lund university

Department of Astronomy and Theoretical Physics, Lund University, Sölvegatan 27, Lund


Adam Takacs (Bergen U.)


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.


Denes Molnar Gergely Gabor Barnafoldi Konrad Tywoniuk

Presentation Materials