Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 65: Schwerionenkollisionen und QCD Phasen IX

HK 65.3: Talk

Friday, March 25, 2011, 14:45–15:00, HS2

Dynamical freeze-out criterion in heavy-ion collisions — •Pasi Huovinen — Johann Wolfgang Goethe-Universität, Frankfurt am Main, Germany

In a fluid dynamical description of relativistic heavy-ion collisions the system is said to freeze out when the collisions between particles become so rare that the system no longer behaves as a fluid, but as free particles instead. This is thought to happen when the scattering rate becomes smaller than the expansion rate, i.e. when local Knudsen number falls below one. In practice, however, freeze-out at constant temperature or density is used instead. In this contribution I study how the final spectra and anisotropy of particles is affected in an ideal fluid calculation if the freeze-out literally takes place when the scattering and expansion rates are equal.