https://doi.org/10.1140/epjc/s10052-022-10400-2
Regular Article - Theoretical Physics
A chiral mean-field equation-of-state in UrQMD: effects on the heavy ion compression stage
1
Frankfurt Institute for Advanced Studies, Ruth-Moufang-Str. 1, 60438, Frankfurt am Main, Germany
2
Institut für Theoretische Physik, Goethe Universität Frankfurt, Max-von-Laue-Str. 1, 60438, Frankfurt am Main, Germany
3
Xidian-FIAS international Joint Research Center, Giersch Science Center, 60438, Frankfurt am Main, Germany
4
GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291, Darmstadt, Germany
5
Akita International University, Yuwa, 010-1292, Akita-city, Japan
6
Helmholtz Research Academy Hesse for FAIR (HFHF), GSI Helmholtzzentrum für Schwerionenforschung GmbH, Campus Frankfurt, Max-von-Laue-Str. 12, 60438, Frankfurt am Main, Germany
c
steinheimer@fias.uni-frankfurt.de
Received:
17
January
2022
Accepted:
5
May
2022
Published online:
11
May
2022
It is shown that the initial compression in central heavy ion collisions at beam energies of GeV depends dominantly on the underlying equation of state and only marginally on the model used for the dynamical description. To do so, a procedure to incorporate any equation of state in the UrQMD transport model is introduced. In particular we compare the baryon density, temperature and pressure evolution as well as produced entropy in a relativistic ideal hydrodynamics approach and the UrQMD transport model, where the same equation of state is used in both approaches. Not only is the compression similar if the same equation of state is used in either dynamical model, but it also strongly depends on the actual equation of state. These results indicate that the equation of state can be studied with observables which are sensitive to the initial compression phase and maximum compression achieved in heavy ion collisions at these beam energies.
© The Author(s) 2022
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