Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-05-03
Phys.Lett. B463 (1999) 138
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 Pages REVTEX, 4 Figures; Title slightly modified, 2 new figures
Scientific paper
10.1016/S0370-2693(99)01018-7
In ultrarelativistic heavy-ion collisions the local three-volume measure is expanding in the longitudinal and transverse directions. This is similar to the Hubble-expansion of the universe, except that the former is not locally isotropic. As an example the expansion rate is calculated assuming that the energy-momentum tensor in the central region is that of an ideal fluid, undergoing Bjorken flow in longitudinal direction, and with initial conditions as expected for BNL-RHIC energy. While the longitudinal expansion of three-volume is independent of the energy density of the fluid, in case of 3+1 dimensional expansion the form of the hydrodynamical solution (rarefaction wave or deflagration shock) affects the three-volume expansion rate on the hadronization hypersurface. As a consequence the average expansion rate on that surface depends on the transverse size of the system. This may reflect in an impact-parameter dependence of the formation probability of light nuclei and of the freeze-out temperature of the strong interactions in the system.
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