Bayesian Constraints on Covariant Density Functional Equations of State of Compact Stars with New NICER Mass-Radius Measurements

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Summary

Recent advancements in astrophysical observations of compact stars, particularly new and updated NICER constraints, provide mass-radius (M-R) data for pulsars spanning masses from 1 to 2 M. A Bayesian framework is applied to covariant density functional (CDF) models with density-dependent meson-nucleon couplings to test modern theories of dense matter.

Highlights

• New NICER constraints provide M-R data for pulsars spanning masses from 1 to 2 M.
• CDF models with density-dependent meson-nucleon couplings are used to test modern theories of dense matter.
• The Bayesian framework is applied to constrain the parameters of CDF models.
• The analysis advances previous efforts by refining the density-dependence parameterization and integrating recent M-R ellipses.
• The results enable more stringent evaluations of dense matter models in light of new astrophysical observations.
• The study assesses the compatibility of the parameter space of CDF models with recent multi-messenger observations of compact stars.
• The analysis reveals more stringent constraints on CDF models given the most recent astrophysical inferences.

Key Insights

• The inclusion of new NICER estimates for PSR J0437 and J1231, along with the reanalysis of PSR J0030, affects only the finer details of the posterior compared to the "Baseline" scenario.
• The tightest credible regions arise in scenario B, where more compact estimates for PSR J1231 and J0030, favoring softer EOS at densities below 2 and 3ρ, respectively, are used.
• The radius for a canonical-mass star is R1.4 = 12.51+0.44-0.55 km for scenario B and 12.83+0.57-0.55 km for scenario F.
• The corresponding tidal deformability is Λ1.4 = 476+153-118 for scenario B and 575+221-158 for scenario F.
• The maximum mass is Mmax = 2.18+0.21-0.16 Mfor scenario B and 2.29+0.25-0.21 Mfor scenario F.
• Scenario F allows for a static compact star interpretation for the secondary component of the GW190814 event.
• The results highlight the robustness of CDF models in addressing the diverse observational data for compact stars.

Mindmap

Citation

Li, J.-J., Tian, Y., & Sedrakian, A. (2024). Bayesian Constraints on Covariant Density Functional Equations of State of Compact Stars with New NICER Mass-Radius Measurements (Version 1). arXiv. https://doi.org/10.48550/ARXIV.2412.16513