Constraints on the Muon Fraction and Density Profile in Neutron Stars
Abstract
Muons in neutron stars (NSs) play especially important roles in addressing several interesting new physics questions associated with detecting as well as understanding interactions and astrophysical effects of muonphilic dark matter particles. The key model inputs for studying the latter are the total muon mass Mμ, the muon mass fraction Mμ /MNS over the NS mass MNS, and the muon radial density profile ρμ (r) in NSs of varying masses. We investigate these quantities within a minimum model for the core of NSs consisting of neutrons, protons, electrons, and muons using an explicitly isospin-dependent parametric equation of state (EOS) constrained by available nuclear laboratory experiments and the latest astrophysical observations of NS masses, radii, and tidal deformabilities. Here, we found that the absolutely maximum muon mass Mμ and its mass fraction Mμ /MNS in the most massive NSs allowed by causality are about 0.025 M⊙ and 1.1%, respectively. For the most massive NS of mass 2.14 M⊙ observed so far, they reduce to about 0.020 M⊙ and 0.9%, respectively. We also study respective effects of individual parameters describing the EOS of high-density neutron-rich nucleonic matter on the muon contents in NSs with varying masses. We found that the most importantmore »
- Publication Date:
- Research Org.:
- Texas A & M Univ., Commerce, TX (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1837902
- Alternate Identifier(s):
- OSTI ID: 1658247
- Grant/Contract Number:
- SC0013702; SC0009971; 2019M652358; 2019ZRJC001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 893; Journal Issue: 1; Journal ID: ISSN 1538-4357
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Neutron stars; Dark matter; High energy astrophysics; Nuclear astrophysics; Nuclear physics
Citation Formats
Zhang, Nai-Bo, and Li, Bao-An. Constraints on the Muon Fraction and Density Profile in Neutron Stars. United States: N. p., 2020.
Web. doi:10.3847/1538-4357/ab7dbc.
Zhang, Nai-Bo, & Li, Bao-An. Constraints on the Muon Fraction and Density Profile in Neutron Stars. United States. https://doi.org/10.3847/1538-4357/ab7dbc
Zhang, Nai-Bo, and Li, Bao-An. Wed .
"Constraints on the Muon Fraction and Density Profile in Neutron Stars". United States. https://doi.org/10.3847/1538-4357/ab7dbc. https://www.osti.gov/servlets/purl/1837902.
@article{osti_1837902,
title = {Constraints on the Muon Fraction and Density Profile in Neutron Stars},
author = {Zhang, Nai-Bo and Li, Bao-An},
abstractNote = {Muons in neutron stars (NSs) play especially important roles in addressing several interesting new physics questions associated with detecting as well as understanding interactions and astrophysical effects of muonphilic dark matter particles. The key model inputs for studying the latter are the total muon mass Mμ, the muon mass fraction Mμ /MNS over the NS mass MNS, and the muon radial density profile ρμ (r) in NSs of varying masses. We investigate these quantities within a minimum model for the core of NSs consisting of neutrons, protons, electrons, and muons using an explicitly isospin-dependent parametric equation of state (EOS) constrained by available nuclear laboratory experiments and the latest astrophysical observations of NS masses, radii, and tidal deformabilities. Here, we found that the absolutely maximum muon mass Mμ and its mass fraction Mμ /MNS in the most massive NSs allowed by causality are about 0.025 M⊙ and 1.1%, respectively. For the most massive NS of mass 2.14 M⊙ observed so far, they reduce to about 0.020 M⊙ and 0.9%, respectively. We also study respective effects of individual parameters describing the EOS of high-density neutron-rich nucleonic matter on the muon contents in NSs with varying masses. We found that the most important but uncertain nuclear physics ingredient for determining the muon contents in NSs is the high-density nuclear symmetry energy.},
doi = {10.3847/1538-4357/ab7dbc},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 893,
place = {United States},
year = {Wed Apr 15 00:00:00 EDT 2020},
month = {Wed Apr 15 00:00:00 EDT 2020}
}
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