Hadron resonance gas with density-dependent interactions for neutron stars and heavy-ion collisions
Abstract
We present a density-dependent generalization of the van der Waals hadron resonance gas model (DD-HRG) for describing both the hot hadronic matter created in heavy-ion collisions and the cold, dense matter inside neutron stars. Non-resonant interactions are incorporated through a generalized excluded-volume prescription with a density-dependent available-volume fraction, supplemented by an arbitrary density-dependent mean field. With isospin-dependent interaction parameters constrained by empirical properties of nuclear matter, the resulting equation of state extends the causality range to include neutron-star interiors and supports two-solar-mass stars. It also improves the description of lattice QCD thermodynamics and conserved-charge susceptibilities at vanishing baryochemical potential, with lattice data favoring reduced repulsion among strange baryons. This DD-HRG framework is available within the latest version of the open-source Thermal-FIST package.
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BibTeX
@misc{vovchenko2026hadron,
title = {{Hadron resonance gas with density-dependent interactions for neutron stars and heavy-ion collisions}},
author = {Volodymyr Vovchenko and Volodymyr Kuznietsov and Tripp Moss},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.05777},
eprint = {2609.05777},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.05777},
}
RIS
TY - UNPB
TI - Hadron resonance gas with density-dependent interactions for neutron stars and heavy-ion collisions
AU - Volodymyr Vovchenko
AU - Volodymyr Kuznietsov
AU - Tripp Moss
PY - 2026
DA - 2026/09/04
PB - arXiv
DO - 10.48550/arxiv.2609.05777
UR - https://arxiv.org/abs/2609.05777
AB - We present a density-dependent generalization of the van der Waals hadron resonance gas model (DD-HRG) for describing both the hot hadronic matter created in heavy-ion collisions and the cold, dense matter inside neutron stars. Non-resonant interactions are incorporated through a generalized excluded-volume prescription with a density-dependent available-volume fraction, supplemented by an arbitrary density-dependent mean field. With isospin-dependent interaction parameters constrained by empirical properties of nuclear matter, the resulting equation of state extends the causality range to include neutron-star interiors and supports two-solar-mass stars. It also improves the description of lattice QCD thermodynamics and conserved-charge susceptibilities at vanishing baryochemical potential, with lattice data favoring reduced repulsion among strange baryons. This DD-HRG framework is available within the latest version of the open-source Thermal-FIST package.
ER -