Wednesday, May 22, 2013

1305.4919 (Jorge Casalderrey-Solana et al.)

From full stopping to transparency in a holographic model of heavy ion

Jorge Casalderrey-Solana, Michal P. Heller, David Mateos, Wilke van der Schee
We numerically simulate planar shock wave collisions in anti-de Sitter space as a model for heavy ion collisions of large nuclei. We uncover a cross-over between two different dynamical regimes as a function of the collision energy. At low energies the shocks first stop and then explode in a manner approximately described by hydrodynamics, in close similarity with the Landau model. At high energies the receding fragments move outwards at the speed of light, with a region of negative energy density and negative longitudinal pressure trailing behind them. The rapidity distribution of the energy density at late times around mid-rapidity is not approximately boost-invariant but Gaussian, albeit with a width that increases with the collision energy.
View original:

No comments:

Post a Comment