Importance of Granular Structure in the Initial Conditions for the   Elliptic Flow
  We show effects of granular structure of the initial conditions (IC) of hydrodynamic description of high-energy nucleus-nucleus collisions on some observables, especially on the elliptic-flow parameter v2. Such a structure enhances production of isotropically distributed high-pT particles, making v2 smaller there. Also, it reduces v2 in the forward and backward regions where the global matter density is smaller, so where such effects become more efficacious. 
R.P.G. Andrade (1), F. Grassi (1), Y. Hama (1), T. Kodama (2) and W.L.   Qian (1) ((1) Sao Paulo U., Brazil, (2) Rio de Jane...