Implications of latest NICER data for the neutron star equation of state
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866917949506322432 |
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| author | Brandes, Len Weise, Wolfram |
| author_facet | Brandes, Len Weise, Wolfram |
| contents | As an update to our previously performed Bayesian inference analyses of the neutron star matter equation-of-state and related quantities, the additional impact of the recently published NICER data of PSR J0437-4751 is examined. Including the mass and radius distributions of this pulsar in our data base results in modest shifts from previously inferred median posterior values of radii $R$ and central densities $n_c$ for representative $1.4\,M_\odot$ and $2.1\,M_\odot$ neutron stars: radii are reduced by about $0.2-0.3$ km to values of $R_{1.4} = 12.1\pm 0.5$ km and $R_{2.1} = 11.9^{+0.5}_{-0.6}$ km (at the 68\% level), and central densities increase slightly to values of $n_c(1.4\,M_\odot)/n_0 = 2.8\pm 0.3$ and $n_c(2.1\,M_\odot)/n_0 = 3.8_{-0.7}^{+0.6}$ (in units of equilibrium nuclear matter density, $n_0 = 0.16$ fm$^{-3}$), i.e., they still fall below five times nuclear saturation density at the 68\% level. As a further significant result, the evidence established by analyzing Bayes factors for a negative trace anomaly measure, $Δ= 1/3-P/\varepsilon < 0$, inside heavy neutron stars is raised to strong. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_05923 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Implications of latest NICER data for the neutron star equation of state Brandes, Len Weise, Wolfram Nuclear Theory High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology Nuclear Experiment As an update to our previously performed Bayesian inference analyses of the neutron star matter equation-of-state and related quantities, the additional impact of the recently published NICER data of PSR J0437-4751 is examined. Including the mass and radius distributions of this pulsar in our data base results in modest shifts from previously inferred median posterior values of radii $R$ and central densities $n_c$ for representative $1.4\,M_\odot$ and $2.1\,M_\odot$ neutron stars: radii are reduced by about $0.2-0.3$ km to values of $R_{1.4} = 12.1\pm 0.5$ km and $R_{2.1} = 11.9^{+0.5}_{-0.6}$ km (at the 68\% level), and central densities increase slightly to values of $n_c(1.4\,M_\odot)/n_0 = 2.8\pm 0.3$ and $n_c(2.1\,M_\odot)/n_0 = 3.8_{-0.7}^{+0.6}$ (in units of equilibrium nuclear matter density, $n_0 = 0.16$ fm$^{-3}$), i.e., they still fall below five times nuclear saturation density at the 68\% level. As a further significant result, the evidence established by analyzing Bayes factors for a negative trace anomaly measure, $Δ= 1/3-P/\varepsilon < 0$, inside heavy neutron stars is raised to strong. |
| title | Implications of latest NICER data for the neutron star equation of state |
| topic | Nuclear Theory High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology Nuclear Experiment |
| url | https://arxiv.org/abs/2412.05923 |