Properties of the neutron star crust: Quantifying and correlating uncertainties with improved nuclear physics

Grams, G.; Somasundaram, R.; Margueron, J.; Reddy, S.

doi:10.1103/physrevc.105.035806

Title: Properties of the neutron star crust: Quantifying and correlating uncertainties with improved nuclear physics

Journal Article · Thu Mar 24 00:00:00 EDT 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.105.035806· OSTI ID:1979872

^[1];

^[2]

University of Lyon (France)
University of Washington, Seattle, WA (United States)

A compressible liquid-drop model (CLDM) is used to correlate uncertainties associated with the properties of the neutron star (NS) crust with theoretical estimates of the uncertainties associated with the equation of state (EOS) of homogeneous neutron and nuclear matter. For the latter, we employ recent calculations based on Hamiltonians constructed using chiral effective-field theory (χEFT). Fits to experimental nuclear masses are employed to constrain the CLDM further, and we find that they disfavor some of the χEFT Hamiltonians. The CLDM allows us to study the complex interplay between bulk, surface, curvature, and Coulomb contributions, and their impact on the NS crust. It also reveals how the curvature energy alters the correlation between the surface energy and the bulk symmetry energy. Here our analysis quantifies how the uncertainties associated with the EOS of homogeneous matter implies significant uncertainties for the composition of the crust, its proton fraction, and the volume fraction occupied by nuclei. We find that the finite-size effects impact the crust composition but have a negligible effect on the net isospin asymmetry of matter. The isospin asymmetry is largely determined by the bulk properties and the isospin dependence of the surface energy. The most significant uncertainties associated with matter properties in the densest regions of the crust, the precise location of the crust-core transition, are found to be strongly correlated with uncertainties associated with the Hamiltonians. By adopting a unified model to describe the crust and the core of NSs, we tighten the correlation between their global properties such as their mass-radius relationship, moment of inertia, crust thickness, and tidal deformability with uncertainties associated with the nuclear Hamiltonians.

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Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Council for Scientific Research (CNRS); National Science Foundation (NSF); LABEX Lyon Institute of Origins; National Research Agency (ANR)

Grant/Contract Number:: FG02-00ER41132; PICS-08294 VIPER; IEA-303083 BEOS; PHY-1430152; PHY-1630782; ANR-10-LABX-0066; ANR-11-IDEX-0007

OSTI ID:: 1979872

Alternate ID(s):: OSTI ID: 1856541

Journal Information:: Physical Review. C, Vol. 105, Issue 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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