Deviations of the Energy-Momentum Tensor from Equilibrium in the Initial State for Hydrodynamics from Transport Approaches

Understand

Many hybrid models of heavy ion collisions construct the initial state for hydrodynamics from transport models.

• Hydrodynamics requires that the energy-momentum tensor $T^{\mu\nu}$ and four-currents $j^{\mu}$ do not deviate considerably from the equilibrium ideal-fluid form, but the ones constructed from transport do not necessarily possess this property.
• In this work we investigate the space-time picture of $T^{\mu\nu}$ deviations from equilibrium in Au+Au collisions using a coarse-grained transport approach.
• The collision energy is varied in the range $E_{lab} = 5-160A$ GeV.