Indications of early thermalization in relativistic heavy-ion collisions

Details Indications of early thermalization in relativistic heavy-ion collisions Indications of early thermalization in relativistic heavy-ion collisions

2010-09-03

arxiv.org/abs/1009.0701v2

Phys.Rev.C83:024910,2011

Physics

Nuclear Physics

Nuclear Theory

Scientific paper

10.1103/PhysRevC.83.024910

The directed flow of particles emitted from the fireball created in a heavy-ion collision is shown to be a very sensitive measure of the pressure equilibration in the first 1 fm/c of the evolution. Performing a 3+1 dimensional relativistic hydrodynamic calculation with nonequilibrated longitudinal and transverse pressures, we show that the directed flow is strongly reduced if the pressure imbalance survives for even a short time. Transverse momentum spectra, elliptic flow and interferometry correlation radii are not very sensitive to this early pressure anisotropy. Comparison with the data points toward a short equilibration time of the order of $0.25$fm/c or less.

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