Abstract
With the improved accuracy of neutron star observational data, it is necessary to derive new equation of state where the crust and the core are consistently calculated within a unified approach. For this purpose we describe non-uniform matter in the crust of neutron stars employing a compressible liquid-drop model, where the bulk and the neutron fluid terms are given from the same model as the one describing uniform matter present in the core. We then generate a set of fifteen unified equations of state for cold catalyzed neutron stars built on realistic modelings of the nuclear interaction, which belongs to two main groups: the first one derives from the phenomenological Skyrme interaction and the second one from \(\mathrm {\chi EFT} \) Hamiltonians. The confrontation of these model predictions allows us to investigate the model dependence for the crust properties, and in particular the effect of neutron matter at low density. The new set of unified equations of state is available at the CompOSE repository.
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Data Availability Statement
This manuscript has associated data in a data repository. [Authors’ comment: The fifteen EoS generated and analysed in the current study are available in the CompOSE repository, under the name ‘GMSR(name of interaction)’. It is available through EoS/Cold Neutron Star EoS/nucleonic models/Unified models/ from https://compose.obspm.fr/.]
Notes
\(m_u=931.494028(23)\) MeV c\(^{-2}\).
\(m(^{56}\)Fe\()=930.411790\) MeV c\(^{-2}\).
\(m_n=939.565413(6)\) MeV c\(^{-2}\).
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Acknowledgements
We thank N. Chamel for providing the nuclear configurations below saturation predicted by BSk22 to BSK25. G.G., J.M. and R.S. are supported by CNRS grant PICS-08294 VIPER (Nuclear Physics for Violent Phenomena in the Universe), the CNRS IEA-303083 BEOS project, the CNRS/IN2P3 NewMAC project, and benefit from PHAROS COST Action MP16214. S.R. is supported by Grant No. DE-FG02-00ER41132 from the Department of Energy , and the Grant No. PHY-1430152 (JINA Center for the Evolution of the Elements), and PHY-1630782 (Network for Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS)) from the National Science Foundation. This work is supported by the LABEX Lyon Institute of Origins (ANR-10-LABX-0066) of the Université de Lyon for its financial support within the program Investissements d’Avenir (ANR-11-IDEX-0007) of the French government operated by the National Research Agency (ANR).
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Grams, G., Margueron, J., Somasundaram, R. et al. Confronting a set of Skyrme and \(\chi _{EFT}\) predictions for the crust of neutron stars. Eur. Phys. J. A 58, 56 (2022). https://doi.org/10.1140/epja/s10050-022-00706-w
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DOI: https://doi.org/10.1140/epja/s10050-022-00706-w