Transport simulations with a constrained momentum-dependent chiral mean-field equation of state at various isospin fractions
Abstract
We present a comparison of the UrQMD model using a chiral mean field EoS (CMF) with flow and pion production data in heavy ion collisions at low beam energies Elab=0.2−2.0 A GeV and varying iso-spin fraction. The CMF model parameters are constrained by known properties of the high density equation of state of QCD at varying iso-spin fractions. This allows us to calculate the equation of state as well as nuclear interactions for different physical systems like neutron stars and heavy ion collisions in a consistent way. It is found that heavy ion reactions at the upcoming FAIR facility will only have marginal sensitivity on the iso-spin dependence of the high-density equation of state. At lower beam energies, comparing to FOPI, HADES and Sπrit data, the sensitivity is higher but the observed deviations and systematic uncertainties of the existing data are larger than the sensitivity to the symmetry energy.
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BibTeX
@misc{steinheimer2026transport,
title = {{Transport simulations with a constrained momentum-dependent chiral mean-field equation of state at various isospin fractions}},
author = {Jan Steinheimer and Marcus Bleicher},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.13415},
eprint = {2606.13415},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.13415},
}
RIS
TY - UNPB
TI - Transport simulations with a constrained momentum-dependent chiral mean-field equation of state at various isospin fractions
AU - Jan Steinheimer
AU - Marcus Bleicher
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2606.13415
UR - https://arxiv.org/abs/2606.13415
AB - We present a comparison of the UrQMD model using a chiral mean field EoS (CMF) with flow and pion production data in heavy ion collisions at low beam energies E_lab=0.2−2.0 A GeV and varying iso-spin fraction. The CMF model parameters are constrained by known properties of the high density equation of state of QCD at varying iso-spin fractions. This allows us to calculate the equation of state as well as nuclear interactions for different physical systems like neutron stars and heavy ion collisions in a consistent way. It is found that heavy ion reactions at the upcoming FAIR facility will only have marginal sensitivity on the iso-spin dependence of the high-density equation of state. At lower beam energies, comparing to FOPI, HADES and Sπrit data, the sensitivity is higher but the observed deviations and systematic uncertainties of the existing data are larger than the sensitivity to the symmetry energy.
ER -