2010/11/30 by Mauricio Martinez, Michael Strickland · 1 citation
Physics and Astronomy · #nucl-th #hep-ph
paper · pdf · doi:10.1016/j.nuclphysa.2011.02.003
published as Nucl.Phys.A856:68-87,2011 · 23 pages, 8 figures; v2 - Correct typos and error in zeroth moment equation (Section 2.4.1); Numerical results only slightly affected, conclusions remains the the same
arxiv created 2014/01/07 · arxiv updated 2014/01/08
We study the non-boost-invariant evolution of a quark-gluon plasma subject to large early-time momentum-space anisotropies. Rather than using the canonical hydrodynamical expansion of the distribution function around an isotropic equilibrium state, we expand around a state which is anisotropic in momentum space and parameterize this state in terms of three proper-time and spatial-rapidity dependent parameters. Deviations from the Bjorken scaling solutions are naturally taken into account by the time evolution of the spatial-rapidity dependence of the anisotropic ansatz. As a result, we obtain three coupled partial differential equations for the momentum-space anisotropy, the typical momentum of the degrees of freedom, and the longitudinal flow. Within this framework (0+1)-dimensional Bjorken expansion is obtained as an asymptotic limit. Finally, we make quantitative comparisons of the temporal and spatial-rapidity evolution of the dynamical parameters and resulting pressure anisotropy in both the strong and weak coupling limits.