Properties of the neutron star crust: Quantifying and correlating uncertainties with improved nuclear physics
Abstract
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 mattermore »
- Authors:
-
[1];
[1];
[1];
[2]
- University of Lyon (France)
- University of Washington, Seattle, WA (United States)
- Publication Date:
- Research Org.:
- Univ. of Washington, Seattle, WA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Council for Scientific Research (CNRS); National Science Foundation (NSF); LABEX Lyon Institute of Origins; National Research Agency (ANR)
- OSTI Identifier:
- 1979872
- Alternate Identifier(s):
- OSTI ID: 1856541
- Grant/Contract Number:
- FG02-00ER41132; PICS-08294 VIPER; IEA-303083 BEOS; PHY-1430152; PHY-1630782; ANR-10-LABX-0066; ANR-11-IDEX-0007
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. C
- Additional Journal Information:
- Journal Volume: 105; Journal Issue: 3; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 79 ASTRONOMY AND ASTROPHYSICS; equations of state of nuclear matter; nuclear astrophysics; nuclear matter in neutron stars
Citation Formats
Grams, G., Somasundaram, R., Margueron, J., and Reddy, S. Properties of the neutron star crust: Quantifying and correlating uncertainties with improved nuclear physics. United States: N. p., 2022.
Web. doi:10.1103/physrevc.105.035806.
Grams, G., Somasundaram, R., Margueron, J., & Reddy, S. Properties of the neutron star crust: Quantifying and correlating uncertainties with improved nuclear physics. United States. https://doi.org/10.1103/physrevc.105.035806
Grams, G., Somasundaram, R., Margueron, J., and Reddy, S. Thu .
"Properties of the neutron star crust: Quantifying and correlating uncertainties with improved nuclear physics". United States. https://doi.org/10.1103/physrevc.105.035806. https://www.osti.gov/servlets/purl/1979872.
@article{osti_1979872,
title = {Properties of the neutron star crust: Quantifying and correlating uncertainties with improved nuclear physics},
author = {Grams, G. and Somasundaram, R. and Margueron, J. and Reddy, S.},
abstractNote = {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.},
doi = {10.1103/physrevc.105.035806},
journal = {Physical Review. C},
number = 3,
volume = 105,
place = {United States},
year = {Thu Mar 24 00:00:00 EDT 2022},
month = {Thu Mar 24 00:00:00 EDT 2022}
}
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