Pushing the hybrid approach to low beam energies with dynamic initial conditions from hadronic transport

Abstract

While hybrid approaches of relativistic hydrodynamics+transport have been well established for the dynamical description of heavy-ion collisions at high beam energies, moving to lower beam energies is challenging. In this work, we propose dynamic initial conditions for the viscous hydrodynamic evolution in heavy-ion collisions at low to intermediate beam energies. They are comprised of core hadrons based on the local energy density during the pre-equilibrium hadronic evolution. The SMASH-vHLLE hybrid approach is then applied to lower beam energies, achieving good agreement with measured bulk observables between $\sqrt{s_{\mathrm{NN}}}=3$ and $9.1\mathrm{GeV}$, thus providing guidance for measurements in STAR-BES and CBM at FAIR.

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