Dynamical freeze-out in event-by-event hydrodynamics

Abstract

In hydrodynamical modeling of the ultrarelativistic heavy-ion collisions the freeze-out is typically performed at a constant temperature or density. In this work we apply a dynamical freeze-out criterion, which compares the hydrodynamical expansion rate with the pion scattering rate. Recently many calculations have been done using event-by-event hydrodynamics where the initial density profile fluctuates from event to event. In these event-by-event calculations the expansion rate fluctuates strongly as well, and thus it is interesting to check how the dynamical freeze-out changes hadron distributions with respect to the constant temperature freeze-out. We present hadron spectra and elliptic flow calculated using (2+1)-dimensional ideal hydrodynamics, and show the differences between constant temperature and dynamical freeze-out criteria. We find that the differences caused by different freeze-out criteria are small in all studied cases.

8 pages, 11 figures, to be published in the proceedings of the 28th Winter Workshop on Nuclear Dynamics, Puerto Rico, April 7-14, 2012

References in corpus (5)

• Elliptic and triangular flow in event-by-event (3+1)D viscous hydrodynamics
• Fully integrated transport approach to heavy ion reactions with an intermediate hydrodynamic stage
• Event-by-event hydrodynamics and elliptic flow from fluctuating initial state
• Integrated Dynamical Approach to Relativistic Heavy Ion Collisions
• Dynamical freeze-out condition in ultrarelativistic heavy ion collisions

Cited by in corpus (12)

• Event-by-event fluctuations in perturbative QCD + saturation + hydro model: pinning down QCD matter shear viscosity in ultrarelativistic heavy-ion collisions
• Relativistic hydrodynamics in heavy-ion collisions: general aspects and recent developments
• Hydrodynamics at RHIC and LHC: What have we learned?
• Influence of temperature dependent shear viscosity on elliptic flow at back- and forward rapidities in ultrarelativistic heavy-ion collisions
• Anisotropic flow in transport+hydrodynamics hybrid approaches
• Exploring the applicability of dissipative fluid dynamics to small systems by comparison to the Boltzmann equation
• Statistical analysis of initial state and final state response in heavy-ion collisions
• Dynamical freeze-out criterion in a hydrodynamical description of Au + Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV and Pb + Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2760$ GeV
• Introduction to Hydrodynamics
• Even-by-event hydrodynamical simulations for ${\sqrt{s}}_{NN}$=200 GeV Au+Au collisions and the correlation between flow coefficients and initial asymmetry measures
• Dynamical freeze-out criterion in event-by-event hydrodynamics
• Relativistic Viscous Hydrodynamics for High Energy Heavy Ion Collisions