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HK: Fachverband Physik der Hadronen und Kerne

HK 62: Schwerionenkollisionen und QCD Phasen

HK 62.5: Vortrag

Donnerstag, 7. März 2013, 15:15–15:30, HSZ-201

Dynamical freeze-out in hydrodynamics — •Hannu Holopainen and Pasi Huovinen — Frankfurt Institute for Advanced Studies, Ruth-Moufang-Straße 1, D-60438 Frankfurt, Germany

In hydrodynamical modeling of the ultrarelativistic heavy-ion collisions the freeze-out is typically performed at a constant temperature. In this work we introduce a dynamical freeze-out criterion, which compares the hydrodynamical expansion rate with the pion scattering rate. We present hadron spectra and elliptic flow calculated using (3+1)-dimensional ideal hydrodynamics, and show the differences between constant temperature and dynamical freeze-out criteria. First we discuss the systematics of the dynamical freeze-out, and for simplicity these calculations have been performed using smooth initial states. Finally dynamical freeze-out condition is applied to event-by-event calculations to evaluate v₂. We find that the differences caused by different freeze-out criteria are small in all studied cases.

This work was supported by the ExtreMe Matter Institute (EMMI) and by BMBF.