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oai:recercat.cat:2445/1457122025-12-05T16:42:58Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Magas, Volodymyr author Gordillo Solana, Joel author Strottman, D. author Xie, Y. L. author Csernai, L. P. author 2019-11-29T14:25:12Z 2019-11-29T14:25:12Z 2018-06-08 2019-11-29T14:25:12Z In the present work we propose a new way of constructing the initial state for further hydrodynamic simulation of relativistic heavy ion collisions based on Bjorken-like solution applied streak by streak in the transverse plane. Previous fluid dynamical calculations in Cartesian coordinates with an initial state based on a streak by streak Yang-Mills field led for peripheral higher energy collisions to large angular momentum, initial shear flow and significant local vorticity. Recent experiments verified the existence of this vorticity via the resulting polarization of emitted Λ and ¯¯¯ Λ particles. At the same time parton cascade models indicated the existence of more compact initial state configurations, which we are going to simulate in our approach. The proposed model satisfies all the conservation laws, including conservation of a strong initial angular momentum, which is present in noncentral collisions. As a consequence of this large initial angular momentum we observe the rotation of the whole system as well as the fluid shear in the initial state, which leads to large flow vorticity. Another advantage of the proposed model is that the initial state can be given in both [t,x,y,z] and [ τ , x , y , η ] coordinates and thus can be tested by all 3+1D hydrodynamical codes which exist in the field. Col·lisions d'ions pesats Dinàmica de fluids Heavy ion collision Fluid dynamics Initial state with shear in peripheral heavy ion collisions