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

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arxiv 2201.01622 v2 pith:CLB2QLHJ submitted 2022-01-05 nucl-th hep-ph

classification nucl-thhep-ph
keywords equationstatecompressionmodelheavyurqmdusedbeam
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abstract

It is shown that the initial compression in central heavy ion collisions at beam energies of $E_\mathrm{lab}=1-10A$~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.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Poincar\'e covariant quantum molecular dynamics: a covariant description of a system of interacting wave packets

    hep-ph 2025-07 conditional novelty 7.0 of 10

    The authors derive Poincaré-covariant mean-field equations of motion for relativistic QMD and show they match Monte-Carlo integration of the exact forces in heavy-ion collisions.

  2. Untangling the interplay of the Equation-of-State and the Collision Term towards the generation of Directed and Elliptic Flow at intermediate energies

    nucl-th 2024-11 conditional novelty 7.0 of 10

    In UrQMD simulations of Au+Au at SIS18/SIS100 energies, the final midrapidity elliptic flow is generated late by the mean-field potential during the breakup of a matter bridge, not by early squeeze-out or spectator shadowing.

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