7 research outputs found
Universal Flow in the First fm/c at RHIC
We will show how both elliptic and radial flow generated during the first
fm/c at RHIC can be expressed in a form which is quasi-independent of the state
of matter and depends only on the initial energy density profile. Descriptions
based on partons or classical fields, thermalized or highly anisotropic, all
lead to the same collective velocity given a few easily satisfied conditions.
This significantly narrows the uncertainty for initializing hydrodynamic
prescriptions.Comment: 4 pages, 2 figures - To appear in the conference proceedings for
Quark Matter 2009, March 30 - April 4, Knoxville, Tennesse
Viscous Hydrodynamics and Relativistic Heavy Ion Collisions
The matter created in relativistic heavy ion collisions is fairly well
described by ideal hydrodynamics, and somewhat better described by viscous
hydrodynamics. To this point, most viscous calculations have been
two-dimensional, based on an assumption of Bjorken boost invariance along the
beam axis. Here, first results are presented for a fully three-dimensional
viscous model. The model is described and tests of the numerical accuracy of
the code are presented. Two- and three-dimensional runs are compared, and
modest changes are observed for mid-rapidity observables at the highest RHIC
(Relativistic Heavy Ion Collider) energies.Comment: 23 pages, 7 figure