README.txt Dataset title ------------- Data publication: Bayesian Analysis of Hybrid Neutron Star EOS Constraints within an Instantaneous Nonlocal Chiral Quark Matter Model Repository and persistent identifier ------------------------------------ Repository: RODARE Record URL: https://rodare.hzdr.de/record/3855 Dataset DOI: https://doi.org/10.14278/rodare.3855 All-versions DOI: https://doi.org/10.14278/rodare.3854 Publication date: 5 July 2025 Related article and repository version -------------------------------------- This dataset accompanies the following peer-reviewed article: Ayriyan, A.; Blaschke, D.; Carlomagno, J.P.; Contrera, G.A.; Grunfeld, A.G. Bayesian Analysis of Hybrid Neutron Star EOS Constraints Within an Instantaneous Nonlocal Chiral Quark Matter Model. Universe 2025, 11, 141. Article DOI: https://doi.org/10.3390/universe11050141 The repository/preprint version of the article is available in arXiv: Ayriyan, A.; Blaschke, D.; Carlomagno, J.P.; Contrera, G.A.; Grunfeld, A.G. Bayesian Analysis of Hybrid Neutron Star EOS Constraints Within an Instantaneous Nonlocal Chiral Quark Matter Model. arXiv:2501.00115. arXiv URL: https://arxiv.org/abs/2501.00115 arXiv DOI: https://doi.org/10.48550/arXiv.2501.00115 Recommended Data Availability Statement for the article and repository version ------------------------------------------------------------------------------ The data underlying this article are openly available in RODARE at https://doi.org/10.14278/rodare.3855. Project and funding information ------------------------------- Project title: Bayesian analysis of the equation of state of dense nuclear matter Project acronym: BAYES Project number: 2021/43/P/ST2/03319 Agreement number: UMO-2021/43/P/ST2/03319 Funding programme: POLONEZ BIS 1 Host institution: University of Wrocław, Faculty of Physics and Astronomy Principal Investigator: Alexander Ayriyan Funding acknowledgement ----------------------- This research is part of the project No. 2021/43/P/ST2/03319 co-funded by the National Science Centre and the European Union Framework Programme for Research and Innovation Horizon 2020 under the Marie Skłodowska-Curie grant agreement No. 945339. For the purpose of Open Access, the author has applied a CC-BY public copyright licence to any Author Accepted Manuscript (AAM) version arising from this submission. Additional funding acknowledgement ---------------------------------- The development of the nonlocal chiral quark-matter equation of state used in this work was additionally supported by the Argentinian organizations CONICET, ANPCyT and UNLP under grants PIP 2022-2024 GI-11220210100150CO, PICT19-00792, PICT22-03-00799 and X960. Dataset description ------------------- This dataset contains tabulated hybrid Equations of State (EOS) for neutron star matter with a first-order phase transition obtained by a Maxwell construction. The hadronic phase is described by the relativistic mean-field DD2 model, while the quark matter phase is generated within an instantaneous nonlocal chiral quark model with color superconductivity. The Bayesian analysis explores the EOS parameter space characterized by the dimensionless coupling parameters eta_D and eta_V, which control the diquark and vector interaction channels, respectively. The deposited data include EOS tables for selected parameter sets. The coupling parameters were selected from the 60% Bayesian credibility region for physically significant cases shown in the accompanying figure Hybrid_EoS_Bayesian_Analysis.png, including: - EOSs producing the maximum and minimum neutron-star masses within the selected region; - EOSs corresponding to the maximum and minimum neutron-star onset properties within the selected region; - the most probable EOS according to the Bayesian posterior. The dataset enables further analysis of neutron-star properties and supports transparency, verification, and reproducibility of the published results. File inventory -------------- The RODARE record contains the following data and figure files: 1. DD2p00_2FCSC3DFF_etaD=1.04_etaV=0.44_css_EOS.dat Tabulated hybrid EOS for eta_D = 1.04 and eta_V = 0.44. 2. DD2p00_2FCSC3DFF_etaD=1.05_etaV=0.40_css_EOS.dat Tabulated hybrid EOS for eta_D = 1.05 and eta_V = 0.40. 3. DD2p00_2FCSC3DFF_etaD=1.08_etaV=0.44_css_EOS.dat Tabulated hybrid EOS for eta_D = 1.08 and eta_V = 0.44. 4. DD2p00_2FCSC3DFF_etaD=1.14_etaV=0.58_css_EOS.dat Tabulated hybrid EOS for eta_D = 1.14 and eta_V = 0.58. 5. DD2p00_2FCSC3DFF_etaD=1.15_etaV=0.72_css_EOS.dat Tabulated hybrid EOS for eta_D = 1.15 and eta_V = 0.72. 6. Hybrid_EoS_Bayesian_Analysis.png Figure illustrating the Bayesian analysis of the hybrid EOS parameter space. 7. Pressure_vs_EnergyDensity.png Figure showing pressure as a function of energy density for the selected EOSs. 8. README.txt This metadata and documentation file. Data format and column description ---------------------------------- Each EOS table is a plain-text data file. Each file corresponds to a particular hybrid EOS parameter set, with eta_D and eta_V specified in the filename. Filename format: DD2p00_2FCSC3DFF_etaD=_etaV=_css_EOS.dat The EOS tables contain the following columns: 1. mu_B: Baryon chemical potential [MeV] 2. p: Pressure [MeV/fm^3] 3. n_B: Baryon number density [fm^-3] 4. eps: Energy density [MeV/fm^3] 5. cs2: Squared speed of sound, c_s^2, in units of c^2 Scientific methodology ---------------------- The EOS tables were generated in the framework of a hybrid neutron-star matter description. A Maxwell construction was used to connect the DD2 hadronic EOS to the quark-matter EOS obtained within the instantaneous nonlocal chiral quark model. The selected EOSs correspond to representative points in the Bayesian posterior distribution over eta_D and eta_V. The data are suitable for reproducing and extending the compact-star calculations presented in the associated article, including analyses of pressure-energy density relations, phase-transition properties, and neutron-star observables derived from the EOS. Software and reuse ------------------ The EOS tables are provided in a simple machine-readable text format and can be read using standard scientific software, for example Python, C/C++, Fortran, Mathematica, or GNUplot. For Python-based analysis, the files can be read with common libraries such as NumPy or pandas. Users should consult the associated article and its arXiv repository version for the physical model, Bayesian methodology, and interpretation of the selected EOS parameter sets. FAIR data statement ------------------- This dataset is made available through RODARE with a persistent DOI, making it findable and citable. The data are provided in open, machine-readable text formats with documented columns, physical units, and parameter values. The record metadata identify the creators, related article, repository/preprint version, keywords, funding information, and license. The dataset is therefore intended to support findability, accessibility, interoperability, and reuse in accordance with FAIR principles. License ------- Current license of the files in the RODARE record: Creative Commons Attribution 4.0 International (CC BY 4.0). How to cite this dataset ------------------------ Please cite the dataset, the peer-reviewed article, and, where appropriate, the arXiv repository version when reusing the data. Dataset: Alexander Ayriyan, David Blaschke, Juan Pablo Carlomagno, Gustavo A. Contrera, and Ana Gabriela Grunfeld, "Data publication: Bayesian Analysis of Hybrid Neutron Star EOS Constraints within an Instantaneous Nonlocal Chiral Quark Matter Model", RODARE, 2025. https://doi.org/10.14278/rodare.3855 Peer-reviewed article: Ayriyan, A.; Blaschke, D.; Carlomagno, J.P.; Contrera, G.A.; Grunfeld, A.G. Bayesian Analysis of Hybrid Neutron Star EOS Constraints Within an Instantaneous Nonlocal Chiral Quark Matter Model. Universe 2025, 11, 141. https://doi.org/10.3390/universe11050141 Repository/preprint version: Ayriyan, A.; Blaschke, D.; Carlomagno, J.P.; Contrera, G.A.; Grunfeld, A.G. Bayesian Analysis of Hybrid Neutron Star EOS Constraints Within an Instantaneous Nonlocal Chiral Quark Matter Model. arXiv:2501.00115. https://doi.org/10.48550/arXiv.2501.00115 Contact ------- Alexander Ayriyan University of Wrocław, Faculty of Physics and Astronomy E-mail: alexander.ayriyan@gmail.com