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Properties of Neutron Star Crust with Improved Nuclear Physics: Impact of Chiral EFT Interactions and Experimental Nuclear Masses

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Abstract

A compressible liquid-drop approach adjusted to uniform matter many-body calculations based on chiral EFT interactions and to the experimental nuclear masses is used to investigate the neutron star crust properties. Eight chiral EFT hamiltonians and a representative phenomenological force (SLy4) are confronted. We show that some properties of the crust, e.g. clusters mass, charge, and asymmetry, are mostly determined by symmetric matter properties close to saturation density and are therefore mainly constrained by experimental nuclear masses, while other properties, e.g., energy per particle, pressure, sound speed, are mostly influenced by low-density predictions in neutron matter, where chiral EFT and phenomenological forces substantially differ.

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Acknowledgements

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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Authors and Affiliations

  1. Univ Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822, Univ Lyon, 69622, Villeurbanne, France

    Guilherme Grams, Jérôme Margueron & Rahul Somasundaram

  2. Institute for Nuclear Theory, University of Washington, Seattle, WA, 98195-1550, USA

    Sanjay Reddy

  3. JINA-CEE, Michigan State University, East Lansing, MI, 48823, USA

    Sanjay Reddy

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  1. Guilherme Grams
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  2. Jérôme Margueron
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  3. Rahul Somasundaram
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  4. Sanjay Reddy
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Correspondence to Jérôme Margueron.

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Grams, G., Margueron, J., Somasundaram, R. et al. Properties of Neutron Star Crust with Improved Nuclear Physics: Impact of Chiral EFT Interactions and Experimental Nuclear Masses. Few-Body Syst 62, 116 (2021). https://doi.org/10.1007/s00601-021-01697-y

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