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It is shown that the initial compression in central heavy ion collisions atbeam energies of $E_\mathrm{lab}=1-10A$~GeV depends dominantly on theunderlying equation of state and only marginally on the model used for thedynamical description. To do so, a procedure to incorporate any equation ofstate in the UrQMD transport model is introduced. In particular we compare thebaryon density, temperature and pressure evolution as well as produced entropyin a relativistic ideal hydrodynamics approach and the UrQMD transport model,where the same equation of state is used in both approaches. Not only is thecompression similar if the same equation of state is used in either dynamicalmodel, but it also strongly depends on the actual equation of state. Theseresults indicate that the equation of state can be studied with observableswhich are sensitive to the initial compression phase and maximum compressionachieved in heavy ion collisions at these beam energies.

A Chiral Mean-Field Equation-of-State in UrQMD: Effects on the Heavy Ion Compression Stage